CN102291813B - A kind of Poewr control method and base station - Google Patents
A kind of Poewr control method and base station Download PDFInfo
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Abstract
The embodiment of the present invention provides a kind of Poewr control method, including：When terminal currently has business, current congestion state is obtained；Current power according to the corresponding maximum carrier power of modulation coding mode and the terminal obtains power headroom；New modulation coding mode is determined according to the current congestion state and power headroom, and when new modulation coding mode is different from current modulation coding mode, indicates the terminal to enable new modulation coding mode.The embodiment of the present invention also provides a kind of base station.The present invention directly adjusts the up modulation coding mode of terminal by anticipation, and the mechanism of terminal oneself hoisting power specified using agreement is made it automatically achieve expected signal to noise ratio, saves control message expense.
Description
Technical field
The present invention relates to wireless communication technology field, specifically, it is directed to OFDMA (Orthogonal Frequency
Division Multiple Access, OFDM) communication system a kind of Poewr control method and base station.
Background technology
In wireless communication system, base station is the equipment for showing Terminal for service, and base station passes through uplink downlink and terminal
Communicated.Descending refers to base station to the direction of terminal, and up refers to the direction of terminal to base station.Multiple terminals can pass through simultaneously
Up-link sends data to base station, it is also possible to while receiving data from base station by downlink.
In recent years, OFDMA technologies due to can effectively antagonize multi-path jamming and arrowband interference, spectrum efficiency is high and become
The mainstream technology of radio communication physical-layer techniques, OFDMA+MIMO (MIMO) technology has compared to the CDMA technology of the third generation
Natural technical advantage, more suitable for wide-band mobile communication system, is acknowledged as the core skill of next generation mobile communication system
One of art.It is physical layer core technology that Long Term Evolution (Long Term Evolution, LTE) uses OFDMA technologies, is next
The mainstream standard of third-generation mobile communication.
In wireless communication system, the purpose of Power Control has three below：
1) slow fading of wireless channel is overcome to the influence of signal.
Mainly overcome influence of the slow part of change to signal quality, rapid fading in wireless channel slow fading and interference
Overcome with violent part is changed in interference by interweaving encoding.
2) prevent power from unrealistically comparing rising, reduce the total interference level of system.
The transmission power of any one channel can all cause the interference to other channels, when system is in power stability point
When, any power ascension can all cause to unrealistically compare the power of other users rising, so as to cause being substantially increased for whole net interference, work(
Rate controls to make by the transmission power of control channel the transmission power of the whole network to be in a smallest point or quasi- smallest point for having solution,
So as to the interference level in reduction system, the capacity of system is improved.
3) transmission power is reduced as far as possible on the premise of QoS requirement is met.
Power control techniques are a kind of optimisation techniques, the target of optimization be meet QoS requirement (bandwidth, the bit error rate,
FER) under conditions of as far as possible reduce transmission power.
Power Control has closed loop and open loop two types, and following formula (1) and formula (2) is corresponded to respectively.
Pnew=Plast+ (C/Nnew-C/Nlast)-(log10 (Rnew)-log10 (Rlast))+Offset (1)
Wherein Pnew is new carrier power, Plast be before carrier power, C/Nnew is new C/N (Carrier
To Noise Ratio, carrier noise ratio), C/Nlast be before C/N values, Rnew is new repeated encoding number of times,
Rlast be before repeated encoding number of times, the adjusted value that Offset gives for base station.
P (dbm)=L+C/N+NI-10log10 (R)+Offset_SSperSS+Offset_BSperSS (2)
Wherein P (dbm) is carrier power, and L is path loss, and C/N is C/N values, and NI is sector interference, and R is repeated encoding number of times,
Offset_SSperSS is the adjusted value that terminal oneself is calculated, the adjusted value that Offset_BSperSS gives for base station.
From formula (1) and formula (2), either closed loop or open loop, (change modulation to compile when base station instruction terminal rises depression of order
Code mode) when, terminal can be explicit without base station according to the new corresponding C/N values automatic power adjustment of modulation coding mode
Terminal transmit power adjusted value is given on ground.
Current after access is according to up CINR (Carrier to Interference plus compared with widespread practice
Noise Ratio, carrier-in-interference noise ratio) and the demodulation threshold of modulation coding mode periodically to adjust power up to control
CINR, it is ensured that transmission quality.Make its power per liter up to be lifted to terminal transmit power adjustment message to alleviate congestion base station
Allow its liter of rank after CINR, up CINR lifting again.
The problem that the above method is present is to compare to depend on power to adjust message, and expense is larger, while when alleviating congestion
It is not quick enough.
The content of the invention
It is an object of the present invention to overcome after existing access present in Poewr control method according to up CINR and modulation
The demodulation threshold of coded system carries out Power Control and relatively depends on power to adjust message and the larger problem of expense and pass through
Base station instruction terminal power per liter come alleviate congestion can be relatively slow, there is provided a kind of Poewr control method and base station.
In order to solve the above problems, the invention provides a kind of Poewr control method, including：
When terminal currently has business, current congestion state is obtained；
Current power according to the corresponding maximum carrier power of modulation coding mode and the terminal obtains power headroom；
New modulation coding mode is determined according to the current congestion state and power headroom, and new modulation coding mode with
During current modulation coding mode difference, the terminal is indicated to enable new modulation coding mode.
Further, the above method can also be had the characteristics that, current congestion state is obtained according to following manner：
Current time slots utilization rate is obtained, it is compared with congestion threshold, during higher than the congestion threshold, be judged to gather around
Plug, otherwise, it is determined that being non-congested.
Further, the above method can also have the characteristics that, described to be determined according to current congestion state and power headroom
New modulation coding mode includes：
If being currently congestion,：
Power headroom rises rank and the non-most high-order of current modulation coding mode enough, then current modulation coding mode is risen into single order
As new modulation coding mode；
Power headroom rises rank enough and current modulation coding mode is most high-order, then maintain current modulation coding mode conduct
New modulation coding mode；
Power headroom is insufficient to a liter rank, and the current not least rank of modulation coding mode and power headroom not enough maintains this rank
When, then single order as new modulation coding mode is dropped into current modulation coding mode；
Power headroom is insufficient to a liter rank, and current modulation coding mode is lowest-order, then maintain current modulation coding mode
As new modulation coding mode；
Power headroom is insufficient to a liter rank, and power headroom when maintaining this rank enough, then maintain current modulation coding mode to make
It is new modulation coding mode.
Further, the above method can also have the characteristics that, described to be determined according to current congestion state and power headroom
New modulation coding mode includes：
If being currently non-congested,：
The current not least rank of modulation coding mode and when power headroom not enough maintains this rank, then by current modulation coding mode
Drop single order is used as new modulation coding mode；
Current modulation coding mode is lowest-order or when power headroom maintains this rank enough, then maintain current modulating-coding side
Formula is used as new modulation coding mode.
Further, the above method can also have the characteristics that, judge whether power headroom rises enough according to following manner
Rank：
It is by the difference of the corresponding maximum carrier power of higher order modulation coding mode and the terminal current power and high by one
The channel quality information of rank modulation coding mode is carried out into the difference of the thresholding channel quality information value current with the terminal
Compare, when the former is more than or equal to the latter, then power headroom rises rank enough, and otherwise, power headroom cannot rise rank, described high by one
Rank modulation coding mode is than the modulation coding mode of current modulation coding mode higher order.
Further, the above method can also have the characteristics that, judge whether power headroom is tieed up enough according to following manner
Hold this rank：
By the difference of the corresponding maximum carrier power of current modulation coding mode and the terminal current power, and current adjust
The difference that the channel quality information of coded system processed exits the thresholding channel quality information value current with the terminal is compared,
When the former is more than or equal to the latter, power headroom maintains this rank enough, and otherwise, power headroom is unable to maintain that this rank.
Further, the above method can also have the characteristics that methods described also includes：The terminal is currently without business
And during the not least rank of current modulation coding mode, current modulation coding mode is dropped single order as new modulation coding mode, it is described
Base station indicates the terminal to enable new modulation coding mode；When currently without business and current modulation coding mode being lowest-order,
Current modulation coding mode is maintained as new modulation coding mode.
The present invention also provides a kind of base station, including, status determining unit, modulation coding mode determining unit and instruction are single
Unit, wherein：
The status determining unit is used for：Judge whether terminal currently has business, and when business is determined with, obtain current
Congestion state；
The modulation coding mode determining unit is used for：According to the corresponding maximum carrier power of modulation coding mode and described
The current power of terminal obtains power headroom, and new modulation coding mode is determined according to the current congestion state and power headroom；
The indicating member is used for：When the new modulation coding mode is different from current modulation coding mode, institute is indicated
State terminal and enable new modulation coding mode.
Further, above-mentioned base station can also have the characteristics that the status determining unit includes：Service condition judges single
Unit and information acquisition unit, wherein：
The service condition identifying unit is used for：Judge whether the terminal currently has business；
Described information acquiring unit is used for：When the service condition identifying unit judges that the terminal currently has business,
Current time slots utilization rate is obtained, the current time slots utilization rate is compared with congestion threshold, during higher than the congestion threshold,
It is judged to congestion, otherwise, it is determined that being non-congested.
Further, above-mentioned base station can also have the characteristics that the modulation coding mode determining unit is
For determining new modulation coding mode according to following manner：If being currently congestion,：
Power headroom rises rank and the non-most high-order of current modulation coding mode enough, then current modulation coding mode is risen into single order
As new modulation coding mode；Power headroom rises rank enough and current modulation coding mode is most high-order, then maintain current modulation
Coded system is used as new modulation coding mode；
Power headroom is insufficient to a liter rank, and the current not least rank of modulation coding mode and power headroom not enough maintains this rank
When, then single order as new modulation coding mode is dropped into current modulation coding mode；
Power headroom is insufficient to a liter rank, and current modulation coding mode is lowest-order, then maintain current modulation coding mode
As new modulation coding mode；
Power headroom is insufficient to a liter rank, and power headroom when maintaining this rank enough, then maintain current modulation coding mode to make
It is new modulation coding mode.
Further, above-mentioned base station can also have the characteristics that the modulation coding mode determining unit is for basis
Following manner determines new modulation coding mode：
If being currently non-congested,：
The current not least rank of modulation coding mode and when power headroom not enough maintains this rank, then by current modulation coding mode
Drop single order is used as new modulation coding mode；
Current modulation coding mode is lowest-order or when power headroom maintains this rank enough, then maintain current modulating-coding side
Formula is used as new modulation coding mode.
Further, above-mentioned base station can also have the characteristics that the modulation coding mode determining unit is according to such as lower section
Formula judges whether power headroom rises rank enough：
It is by the difference of the corresponding maximum carrier power of higher order modulation coding mode and the terminal current power and high by one
The channel quality information of rank modulation coding mode is carried out into the difference of the thresholding channel quality information value current with the terminal
Compare, when the former is more than or equal to the latter, then power headroom rises rank enough, and otherwise, power headroom cannot rise rank, described high by one
Rank modulation coding mode is than the modulation coding mode of current modulation coding mode higher order.
Further, above-mentioned base station can also have the characteristics that the modulation coding mode determining unit is according to such as lower section
Formula judges whether power headroom maintains this rank enough：
By the difference of the corresponding maximum carrier power of current modulation coding mode and the terminal current power, and current adjust
The difference that the channel quality information of coded system processed exits the thresholding channel quality information value current with the terminal is compared,
When the former is more than or equal to the latter, power headroom maintains this rank enough, and otherwise, power headroom is unable to maintain that this rank.
Further, above-mentioned base station can also have the characteristics that the modulation coding mode determining unit is additionally operable to：Work as institute
State state determination unit to judge during currently without business, if the not least rank of current modulation coding mode, by current modulating-coding
Mode drops single order as new modulation coding mode；If current modulation coding mode is lowest-order, by current modulation coding mode
As new modulation coding mode.
Compared with prior art, congestion state, different modulation volumes are judged invention introduces according to Slot utilization rates
Code mode sets different maximum carrier powers and the method that modulation coding mode is determined according to congestion state and power headroom, energy
Rapid recovery congestion.In addition, interference is controlled based on the method that modulation coding mode sets maximum carrier power, with reference to congestion shape
State, power headroom and service condition can reasonably determine modulation coding mode, so as to improve the performance of system, lift user's body
Test.
Brief description of the drawings
Fig. 1 is embodiment of the present invention Poewr control method flow chart；
The maximum carrier power schematic diagram of the every kind of modulation coding mode setting of Fig. 2 embodiment of the present invention is (in the present embodiment
Row supports QPSK1/2, tetra- kinds of modulation coding modes of QPSK3/4,16QAM1/2,16QAM3/4)；
Fig. 3 is embodiment of the present invention Poewr control method flow chart；
Fig. 4 is embodiment of the present invention base station block diagram；
Fig. 5 is embodiment of the present invention status determining unit block diagram.
Specific embodiment
To make the object, technical solutions and advantages of the present invention become more apparent, below in conjunction with accompanying drawing to the present invention
Embodiment be described in detail.It should be noted that in the case where not conflicting, in the embodiment and embodiment in the application
Feature can mutually be combined.
Poewr control method provided in an embodiment of the present invention, as shown in figure 1, including：
Step 101, when terminal currently has business, obtains current congestion state；
Step 102, is every maximum carrier power of rank modulation coding mode setting, according to the corresponding maximum of modulation coding mode
The current power of carrier power and terminal obtains power headroom；
Step 103, new modulation coding mode is determined according to current congestion state and power headroom, in new modulation coding mode
During different from current modulation coding mode, base station instruction terminal enables new modulation coding mode.
Wherein it is possible to adaptively judge congestion state according to Slot (time slot) utilization rate；Can also be utilized according to CPU
Rate, excited user number or total throughout judge congestion state, and this is not limited by the present invention.It is a kind of to be judged according to slot efficiency
The method of current congestion state is：Current time slots utilization rate is obtained, it is compared with congestion threshold, higher than congestion door
In limited time, it is judged to congestion, otherwise, it is determined that being non-congested.
Wherein, determine that new modulation coding mode includes according to current congestion state and power headroom：
If being currently congestion,：
Power headroom rises rank and the non-most high-order of current modulation coding mode enough, then current modulation coding mode is risen into single order
As new modulation coding mode；
Power headroom rises rank enough and current modulation coding mode is most high-order, then maintain current modulation coding mode conduct
New modulation coding mode；
Power headroom is insufficient to a liter rank, and the current not least rank of modulation coding mode and power headroom not enough maintains this rank
When, then single order as new modulation coding mode is dropped into current modulation coding mode；
Power headroom is insufficient to a liter rank, and current modulation coding mode is lowest-order, then maintain current modulation coding mode
As new modulation coding mode；
Power headroom is insufficient to a liter rank, and power headroom when maintaining this rank enough, then maintain current modulation coding mode to make
It is new modulation coding mode；
If being currently non-congested,：
The current not least rank of modulation coding mode and when power headroom not enough maintains this rank, then by current modulation coding mode
Drop single order is used as new modulation coding mode；
Current modulation coding mode is lowest-order or when power headroom maintains this rank enough, then maintain current modulating-coding side
Formula is used as new modulation coding mode.
Wherein, judge whether power headroom rises rank enough according to following manner：
It is by the difference of the corresponding maximum carrier power of higher order modulation coding mode and the terminal current power and high by one
The channel quality information of rank modulation coding mode is carried out into the difference of the thresholding channel quality information value current with the terminal
Compare, when the former is more than or equal to the latter, then power headroom rises rank enough, and otherwise, power headroom cannot rise rank, described high by one
Rank modulation coding mode is than the modulation coding mode of current modulation coding mode higher order.
Wherein, judge whether power headroom maintains this rank enough according to following manner：
By the difference of the corresponding maximum carrier power of current modulation coding mode and the terminal current power, and current adjust
The difference that the channel quality information of coded system processed exits the thresholding channel quality information value current with the terminal is compared,
When the former is more than or equal to the latter, power headroom maintains this rank enough, and otherwise, power headroom is unable to maintain that this rank.
Wherein, above-mentioned channel quality information value can be up CINR values, or other can weigh channel quality
Value, such as SINR (Signal to Interference plus Noise Ratio, Signal to Interference plus Noise Ratio) value
Deng.
Wherein, methods described also includes, during currently without business and the not least rank of current modulation coding mode, will currently adjust
Coded system processed drops single order as new modulation coding mode, and base station instruction terminal enables new modulation coding mode, currently without industry
Business and when current modulation coding mode is lowest-order, maintains current modulation coding mode as new modulation coding mode.
The Poewr control method to embodiment of the present invention access phase is illustrated below in conjunction with the accompanying drawings.
, it is necessary to set the maximum carrier power of every rank in the embodiment of the present invention, the maximum carrier power of more high-order is smaller.
As shown in Fig. 2 QPSK1/2, QPSK3/4,16QAM1/2,16QAM3/4 represent four kinds of modulation coding modes；
MaxPower_QPSK_1_2 represents the maximum carrier power being allowed to use when using QPSK1/2；MaxPower_QPSK_3_
4 represent the maximum carrier power being allowed to use when using QPSK3/4；MaxPower_16QAM_1_2 is represented to work as and used
The maximum carrier power being allowed to use during 16QAM1/2；MaxPower_16QAM_3_4 is represented and permitted when using QPSK1/2
Perhaps the maximum carrier power for using.
As shown in figure 3, the Poewr control method flow of the access phase of the embodiment of the present invention is as follows：
Step 301：Cycle AMC (Adaptive Modulation and Coding) time decision is arrived, and starts AMC judgement flows.
Step 302：Whether judgement currently has business, if there is business to proceed to step 303, is otherwise transferred to step 306.
Step 303：Judge it is current whether congestion, if congestion proceeds to step 304, be otherwise transferred to step 305.
Wherein, whether congestion state higher than congestion threshold is determined according to current Slot utilization rates, during higher than congestion threshold
It is judged to congestion, is otherwise judged to non-congested.
Step 304：Judge whether to meet not for most high-order and have the power headroom of liter rank (i.e. whether power headroom rises enough
Rank), if satisfaction proceeds to step 307, otherwise it is transferred to step 305.
Wherein, the method for determining whether the power headroom of liter rank is with the maximum carrier wave work(of the MCS than current higher order
Rate is compared with the entrance thresholding of higher order MCS with the difference of current power with the difference of current up CINR, if the former is big
In or be equal to the latter it is determined that there is the power headroom of liter rank, otherwise it is determined that the power headroom without liter rank.When the two compares
Must unified step-length.If being 0.5db than the unit of power headroom, the unit of CINR is 0.25db, then the comparison expression left side needs to multiply
With 2.
Wherein, there is one per rank MCS into thresholding and exiting thresholding, into thresholding and to exit thresholding be all a channel
Quality information threshold value, represents that channel quality can meet demodulation and require in the rank greater than or equal into thresholding, and can enter should
Rank, the rank must be then exited less than thresholding is exited.In the present embodiment channel quality is weighed using CINR values.It is of course also possible to make
Channel quality is weighed with other parameters.
Step 305：Judge whether to meet current MCS not for lowest-order and power headroom not enough maintains this rank, if met
Step 308 is then transferred to, step 309 is otherwise transferred to；
Wherein, judge whether power headroom maintains this rank enough according to following manner：
If meeting (the maximum carrier power-current power of current MCS) ＜ (current MCS exits thresholding-current CINR values),
Represent that power headroom not enough maintains the demodulation requirement of this rank, it is necessary to depression of order；Otherwise, this rank is maintained enough, it is not necessary to depression of order.
Step 306, judges whether current MCS is lowest-order, if it is, being transferred to step 309, otherwise, is transferred to step 308；
Step 307：The MCS of higher order is directly specified, step 310 is transferred to.
Step 308：The MCS of low single order is directly specified, step 310 is transferred to.
Step 309：Keep current MCS constant, be transferred to step 311.
Step 310：When to become rank generations be MCS changes, receiving terminal reporting uplink CINR again is waited after several frames, be transferred to step
Rapid 311.
Step 311：Entrance thresholding and the work(that exits thresholding adjustment terminal of the base station according to up CINR and current MCS
Rate, by up CINR controls are in the entrance thresholding of current MCS and exit between thresholding, flow terminates.
Wherein, step 311 can not also be performed.
The embodiment of the present invention also provides a kind of base station, as shown in figure 4, including status determining unit, modulation coding mode is true
Order unit and indicating member, wherein：
The status determining unit is used for：Whether judgement currently has business, and when business is determined with, obtains current congestion
State；
Modulation coding mode determining unit is used for：According to the corresponding maximum carrier power of modulation coding mode and current power
Power headroom is obtained, new modulation coding mode is determined according to the current congestion state and power headroom；
Indicating member is used for：When the new modulation coding mode is different from current modulation coding mode, instruction terminal is opened
Use new modulation coding mode.
Wherein, as shown in figure 5, the status determining unit is further included：Service condition identifying unit and acquisition of information
Unit, wherein：
The service condition identifying unit is used for：Judge whether the terminal currently has business；
Described information acquiring unit is used for：When the service condition identifying unit judges that the terminal currently has business,
Current time slots utilization rate is obtained, the current time slots utilization rate is compared with congestion threshold, during higher than the congestion threshold,
It is judged to congestion, otherwise, it is determined that being non-congested.
The modulation coding mode determining unit is for determining new modulation coding mode according to following manner：
If being currently congestion,：
Power headroom rises rank and the non-most high-order of current modulation coding mode enough, then current modulation coding mode is risen into single order
As new modulation coding mode；Power headroom rises rank enough and current modulation coding mode is most high-order, then maintain current modulation
Coded system is used as new modulation coding mode；
Power headroom is insufficient to a liter rank, and the current not least rank of modulation coding mode and power headroom not enough maintains this rank
When, then single order as new modulation coding mode is dropped into current modulation coding mode；
Power headroom is insufficient to a liter rank, and current modulation coding mode is lowest-order, then maintain current modulation coding mode
As new modulation coding mode；
Power headroom is insufficient to a liter rank, and power headroom when maintaining this rank enough, then maintain current modulation coding mode to make
It is new modulation coding mode.
Wherein, the modulation coding mode determining unit is for determining new modulation coding mode according to following manner：
If being currently non-congested,：
The current not least rank of modulation coding mode and when power headroom not enough maintains this rank, then by current modulation coding mode
Drop single order is used as new modulation coding mode；
Current modulation coding mode is lowest-order or when power headroom maintains this rank enough, then maintain current modulating-coding side
Formula is used as new modulation coding mode.
Wherein, the modulation coding mode determining unit judges whether power headroom rises rank enough according to following manner：
It is by the difference of the corresponding maximum carrier power of higher order modulation coding mode and the terminal current power and high by one
The channel quality information of rank modulation coding mode is carried out into the difference of the thresholding channel quality information value current with the terminal
Compare, when the former is more than or equal to the latter, then power headroom rises rank enough, and otherwise, power headroom cannot rise rank, described high by one
Rank modulation coding mode is than the modulation coding mode of current modulation coding mode higher order.
Wherein, the modulation coding mode determining unit judges whether power headroom maintains this enough according to following manner
Rank：
By the difference of the corresponding maximum carrier power of current modulation coding mode and the terminal current power, and current adjust
The difference that the channel quality information of coded system processed exits the thresholding channel quality information value current with the terminal is compared,
When the former is more than or equal to the latter, power headroom maintains this rank enough, and otherwise, power headroom is unable to maintain that this rank.
Wherein, the modulation coding mode determining unit is additionally operable to：When the state determination unit is judged currently without industry
During business, if the not least rank of current modulation coding mode, single order as new modulation coding mode is dropped using current modulation coding mode；
If current modulation coding mode is lowest-order, using current modulation coding mode as new modulation coding mode.
The present invention determines modulation coding mode according to congestion state, power headroom and service condition, is actively dropped during without business
Rank, maintains current rank or depression of order when having business non-congested, rank is actively risen when power headroom is enough when having traffic congestion, can carry
High-throughput and rapidly alleviate congestion.The embodiment of the present invention is relative by the way of directly depression of order is risen to be changed by adjusting power
Become the mode ratio of signal to noise ratio faster, so rank can be quickly risen when having traffic congestion alleviates congestion, quick depression of order during without business
Power is set quickly to reduce so as to reduce interference.Meanwhile, direct instruction terminal becomes rank relief terminal and adjusts power according to agreement oneself
The message overhead of power adjustment can be saved.In addition, maximum carrier power is set per rank can suppress the uplink interference of the whole network.This
Invent the method for proposing and combine congestion, power headroom and service condition three, can be with the reverse performance of lifting system.The present invention
By anticipation, the up modulation coding mode of terminal, the mechanism of terminal oneself hoisting power specified using agreement are directly adjusted
It is automatically achieved expected signal to noise ratio, it is then changed again rather than indicating hoisting power to improve its signal to noise ratio by base station
Modulation coding mode, comparatively, had both saved control message expense, also caused that result is controllable.
One of ordinary skill in the art will appreciate that all or part of step in the above method can be instructed by program
Related hardware is completed, and described program can be stored in computer-readable recording medium, such as read-only storage, disk or CD
Deng.Alternatively, all or part of step of above-described embodiment can also be realized using one or more integrated circuits.Accordingly
Ground, each module/unit in above-described embodiment can be realized in the form of hardware, it would however also be possible to employ the shape of software function module
Formula is realized.The present invention is not restricted to the combination of the hardware and software of any particular form.
Claims (14)
1. a kind of Poewr control method, it is characterised in that including：
When terminal currently has business, current congestion state is obtained；
It is every maximum carrier power of rank modulation coding mode setting, according to the corresponding maximum carrier power of modulation coding mode and institute
The current power for stating terminal obtains power headroom；
New modulation coding mode is determined according to the current congestion state and power headroom, and new modulation coding mode with it is current
When modulation coding mode is different, the terminal is indicated to enable new modulation coding mode；
Wherein, judge whether power headroom rises rank enough according to following manner：By the corresponding maximum of higher order modulation coding mode
The difference of carrier power and the terminal current power, and higher order modulation coding mode channel quality information enter thresholding with
The difference of the current channel quality information value of the terminal is compared, when the former is more than or equal to the latter, then power headroom
Rank is risen enough, and the higher order modulation coding mode is than the modulation coding mode of current modulation coding mode higher order.
2. the method for claim 1, it is characterised in that current congestion state is obtained according to following manner：
Current time slots utilization rate is obtained, it is compared with congestion threshold, during higher than the congestion threshold, be judged to congestion,
Otherwise, it is determined that being non-congested.
3. the method for claim 1, it is characterised in that described that new tune is determined according to current congestion state and power headroom
Coded system processed includes：
If being currently congestion,：
Power headroom rises rank and the non-most high-order of current modulation coding mode enough, then using current modulation coding mode rise single order as
New modulation coding mode；
Power headroom rises rank enough and current modulation coding mode is most high-order, then maintain current modulation coding mode as new tune
Coded system processed；
Power headroom is insufficient to a liter rank, and the current not least rank of modulation coding mode and power headroom are when not enough maintaining this rank, then
Single order as new modulation coding mode is dropped into current modulation coding mode；
Power headroom is insufficient to a liter rank, and current modulation coding mode is lowest-order, then maintain current modulation coding mode conduct
New modulation coding mode；
Power headroom is insufficient to a liter rank, and power headroom when maintaining this rank enough, then maintain current modulation coding mode as new
Modulation coding mode.
4. the method for claim 1, it is characterised in that described that new tune is determined according to current congestion state and power headroom
Coded system processed includes：
If being currently non-congested,：
The current not least rank of modulation coding mode and when power headroom not enough maintains this rank, then drop one by current modulation coding mode
Rank is used as new modulation coding mode；
Current modulation coding mode is lowest-order or when power headroom maintains this rank enough, then maintain current modulation coding mode to make
It is new modulation coding mode.
5. method as claimed in claim 3, it is characterised in that when the corresponding maximum carrier power of higher order modulation coding mode
Difference with the terminal current power enters thresholding and the end less than the channel quality information of higher order modulation coding mode
During the difference of the current channel quality information value in end, power headroom cannot rise rank.
6. method as claimed in claim 4, it is characterised in that judge whether power headroom maintains this enough according to following manner
Rank：
The difference of the corresponding maximum carrier power of current modulation coding mode and the terminal current power, and current modulation are compiled
The difference that the channel quality information of code mode exits the thresholding channel quality information value current with the terminal is compared, currently
When person is more than or equal to the latter, power headroom maintains this rank enough, and otherwise, power headroom is unable to maintain that this rank.
7. the method as described in claim 1 to 6 is any, it is characterised in that methods described also includes：The terminal currently without
When business and the not least rank of current modulation coding mode, current modulation coding mode is dropped single order as new modulation coding mode,
Base station indicates the terminal to enable new modulation coding mode；When currently without business and current modulation coding mode being lowest-order,
Current modulation coding mode is maintained as new modulation coding mode.
8. a kind of base station, it is characterised in that including, status determining unit, modulation coding mode determining unit and indicating member, its
In：
The status determining unit is used for：Judge whether terminal currently has business, and when business is determined with, obtain current congestion
State；
The modulation coding mode determining unit is used for：According to the corresponding maximum carrier power of modulation coding mode and the terminal
Current power obtain power headroom, new modulation coding mode is determined according to the current congestion state and power headroom；Also use
In judging whether power headroom rises rank enough according to following manner：By the corresponding maximum carrier power of higher order modulation coding mode
Channel quality information with the difference of the terminal current power, and higher order modulation coding mode enters thresholding and the terminal
The difference of current channel quality information value is compared, and when the former is more than or equal to the latter, then power headroom rises rank enough,
The higher order modulation coding mode is than the modulation coding mode of current modulation coding mode higher order；
The indicating member is used for：When the new modulation coding mode is different from current modulation coding mode, the end is indicated
End enables new modulation coding mode；
The base station is every maximum carrier power of rank modulation coding mode setting.
9. base station as claimed in claim 8, it is characterised in that the status determining unit includes：Service condition identifying unit
And information acquisition unit, wherein：
The service condition identifying unit is used for：Judge whether the terminal currently has business；
Described information acquiring unit is used for：When the service condition identifying unit judges that the terminal currently has business, obtain
Current time slots utilization rate, the current time slots utilization rate is compared with congestion threshold, during higher than the congestion threshold, is judged
It is congestion, otherwise, it is determined that being non-congested.
10. base station as claimed in claim 9, it is characterised in that
The modulation coding mode determining unit is for determining new modulation coding mode according to following manner：
If being currently congestion,：
Power headroom rises rank and the non-most high-order of current modulation coding mode enough, then using current modulation coding mode rise single order as
New modulation coding mode；Power headroom rises rank enough and current modulation coding mode is most high-order, then maintain current modulating-coding
Mode is used as new modulation coding mode；
Power headroom is insufficient to a liter rank, and the current not least rank of modulation coding mode and power headroom are when not enough maintaining this rank, then
Single order as new modulation coding mode is dropped into current modulation coding mode；
Power headroom is insufficient to a liter rank, and current modulation coding mode is lowest-order, then maintain current modulation coding mode conduct
New modulation coding mode；
Power headroom is insufficient to a liter rank, and power headroom when maintaining this rank enough, then maintain current modulation coding mode as new
Modulation coding mode.
11. base stations as claimed in claim 9, it is characterised in that the modulation coding mode determining unit is for according to such as
Under type determines new modulation coding mode：
If being currently non-congested,：
The current not least rank of modulation coding mode and when power headroom not enough maintains this rank, then drop one by current modulation coding mode
Rank is used as new modulation coding mode；
Current modulation coding mode is lowest-order or when power headroom maintains this rank enough, then maintain current modulation coding mode to make
It is new modulation coding mode.
12. base stations as claimed in claim 10, it is characterised in that when the corresponding maximum carrier wave work(of higher order modulation coding mode
The difference of rate and the terminal current power less than the channel quality information of higher order modulation coding mode enter thresholding with it is described
During the difference of the current channel quality information value of terminal, power headroom cannot rise rank.
13. base stations as claimed in claim 11, it is characterised in that the modulation coding mode determining unit is according to following manner
Judge whether power headroom maintains this rank enough：
The difference of the corresponding maximum carrier power of current modulation coding mode and the terminal current power, and current modulation are compiled
The difference that the channel quality information of code mode exits the thresholding channel quality information value current with the terminal is compared, currently
When person is more than or equal to the latter, power headroom maintains this rank enough, and otherwise, power headroom is unable to maintain that this rank.
14. base station as described in claim 8 to 13 is any, it is characterised in that the modulation coding mode determining unit is also used
In：When the state determination unit is judged currently without business, if the not least rank of current modulation coding mode, will currently adjust
Coded system processed drops single order as new modulation coding mode；If current modulation coding mode is lowest-order, volume will be currently modulated
Code mode is used as new modulation coding mode.
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