CN102036354B - Method and device for allocating power to downlink control channel, and base station - Google Patents
Method and device for allocating power to downlink control channel, and base station Download PDFInfo
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Abstract
The invention discloses a method and a device for allocating power to a downlink control channel, and a base station. By the invention, the power is dynamically allocated to the downlink control channel, the reasonableness of allocating the power to the downlink control channel is improved, the receiving performance of the downlink control channel of each user is improved, and same frequency interference among cells of the downlink control channel is reduced. The method comprises the following steps of: determining the received signal-to-noise ratio of the downlink control channel of the user according to downlink channel information of the user; determining the target signal-to-noise ratio of the downlink control channel of the user; and determining the transmitting power of the downlink control channel of the user according to the received signal-to-noise ratio and the target signal-to-noise ratio. Due to the technical scheme, the reasonableness of allocating the power to the downlink control channel of the user is improved, so that the receiving performance of the downlink control channel of each user is improved, and the same frequency interference among the cells of the downlink control channel is reduced.
Description
Technical field
The present invention relates to the communications field, relate in particular to a kind of method, device and base station for down control channel distribution power.
Background technology
At present, at LTE(Long Term Evolution, Long Term Evolution) in system, for reducing in community, disturb, the mode of mainly taking is to adopt OFDM(Orthogonal Frequency Division Multiplexing, OFDM in down control channel) the technical transmission data, although having reduced in community, this kind of mode disturb, but increased ICI(Inter-Cell Interference, presence of intercell interference) disturb, with traditional 3G system, compare particularly remarkable.For reducing presence of intercell interference, the mode of mainly taking is minizone proportion multiplex mode transmission data, between neighbor cell, uses different band networkings, but the networking mode that coefficient as multiplexing as proportion is 3,4 or 7; This kind of networking mode is the LTE system proposition challenge greatly of 20MHz to the maximum for system bandwidth, as: when the networking bandwidth is 20MHz, if the networking mode that the multiplexing coefficient of proportion is 3 needs the LTE system that the bandwidth of 60MHz can be provided; If the networking mode that the multiplexing coefficient of proportion is 4, need the LTE system that the bandwidth of 80MHz can be provided; If the networking mode that the proportion multiplex system is 7, need the LTE system that the bandwidth of 140MHz can be provided; But frequency resource is comparatively in short supply at present, provides the difficulty of above-mentioned bandwidth larger.
For the networking mode that to realize frequency reuse be 1, studied multiple minizone IM(IM in the standardisation process of LTE, Interference Mitigation, interference mitigation) technology, and to carrying out the semi-static ICIC(Inter-Cell Interference of uplink and downlink Coordination, Inter-Cell Interference Coordination) required load information carried out standardization.But standardized semi-static ICIC only arranges for the uplink and downlink shared channel, and, for down control channel, can't take above-mentioned semi-static ICIC.
At present, PDCCH(Physical Downlink Control Channel, Physical Downlink Control Channel) resource is very limited, based on the current understanding to identical networking in the LTE system, performance how to guarantee control channel will become bottleneck and the key that realizes identical networking in the LTE system: if carry out identical networking, the interference that PDCCH is subject to neighbor cell is larger, thereby has limited the receptivity of PDCCH; And the schedule information of uplink and downlink shared channel and resource allocation information all carry by down control channel (as PDCCH), if can't guarantee, PDCCH receives the correctness of information, will be to the QoS(Quality of Service of customer service, service quality) impact is larger.
In the LTE system, PDCCH is for carrying user's DCI(Downlink Control Information, Downlink Control Information), this DCI comprises: the uplink power control command word information of uplink scheduling authorization information, downlink resource assignment information, multi-user association coding etc.; For supporting dissimilar information, DCI information can be divided into multiple format (being DCI format), and DCI format is different, and its corresponding information bit length is not identical yet.In a subframe, user's DCI message bit stream by cyclic redundancy check (CRC), coding, sub-block interweave, after rate-matched, scrambling, modulation, layer mapping, precoding, be mapped to actual physics REG(Resource Element Group, the resource grains subgroup) on resource.
At present, for improving the utilance of PDCCH resource, for PDCCH has defined 4 kinds of forms (being PDCCH format), as shown in table 1 in the LTE system, these the 4 kinds of corresponding PDCCH polymerization of PDCCH form grades are respectively 1,2,4,8; Higher grade of PDCCH polymerization, and the shared physics REG resource of PDCCH corresponding to user is more, carries a needed resource of DCI information more, that is to say that the efficiency of transmission of this PDCCH channel of DCI information of transmission formed objects is lower; Accordingly, from the user, receive PDCCH, the PDCCH received signal to noise ratio of its requirement is lower.In the LTE standard, adopting the DCI information of which kind of PDCCH form transmission user not make clear and definite regulation, is mainly the product that depends on each equipment vendor.
Four kinds of forms that table 1 is PDCCH in the LTE system
| The PDCCH form | The polymerization grade | The REG number | The data b it number that can carry |
| C | 1 | 9 | 72 |
| 1 | 2 | 18 | 144 |
| 2 | 4 | 36 | 288 |
| 3 | 8 | 72 | 576 |
At present in order to improve the receptivity of PDCCH corresponding to user, improve the utilance to the PDCCH resource simultaneously, major way is: the base station PDCCH corresponding to each user adopts the constant power distribution principle, and the specified transmitting power that is about to base station is all distributed to the physics REG resource in an OFDM symbol.The power division of this kind of PDCCH channel only adopts the strategy of power-sharing, for user DCI information is chosen the bit length according to the DCI information that is user's channel condition and user of PDCCH form, except the handling process of LTE standard code, each user's PDCCH performance guarantee only relies on limited several polymerization grades (being generally 4) and carries out link circuit self-adapting, can not guarantee the receptivity of PDCCH, may also can have the problem that co-channel interference is more serious.
Summary of the invention
The invention provides a kind of method, device and base station for down control channel distribution power, be embodied as down control channel dynamic assignment power, distribute the reasonability of power to rise to down control channel, thereby improve the receptivity and the minizone co-channel interference that reduces down control channel of each user's down control channel.
A kind of method for down control channel distribution power comprises:
According to user's descending channel information, determine the received signal to noise ratio of described user's down control channel;
Choose Downlink Control Information DCI form and multiple polymerization grade;
For every kind of polymerization grade, determine described DCI form and adopt this kind of needed receiving terminal signal to noise ratio of polymerization grade; According to this, obtain a plurality of and described multiple polymerization grade a plurality of receiving terminal signal to noise ratios one to one;
The receiving terminal signal to noise ratio of value minimum in described a plurality of receiving terminal signal to noise ratios is defined as to the target signal to noise ratio of described user's down control channel; Perhaps, by the undulating value of the receiving terminal signal to noise ratio of described value minimum and presence of intercell interference and value, be defined as the target signal to noise ratio of described user's down control channel; Perhaps, from described a plurality of receiving terminal signal to noise ratios, select the receiving terminal signal to noise ratio the most approaching with described received signal to noise ratio, and the received signal to noise ratio of choosing is defined as to the target signal to noise ratio of described user's down control channel; Perhaps, select the receiving terminal signal to noise ratio the most approaching with described received signal to noise ratio from described a plurality of receiving terminal signal to noise ratios, and by the received signal to noise ratio chosen and described presence of intercell interference undulating value and value, be defined as the target signal to noise ratio of described user's down control channel;
According to described received signal to noise ratio and described target signal to noise ratio, determine the transmitting power of described user's down control channel.
A kind of device for down control channel distribution power comprises:
The received signal to noise ratio determining unit, for the descending channel information according to the user, determine the received signal to noise ratio of described user's down control channel;
The target signal to noise ratio determining unit, for choosing Downlink Control Information DCI form and multiple polymerization grade; For every kind of polymerization grade, determine described DCI form and adopt this kind of needed receiving terminal signal to noise ratio of polymerization grade; According to this, obtain a plurality of and described every kind of polymerization grade a plurality of receiving terminal signal to noise ratios one to one; The receiving terminal signal to noise ratio of value minimum in described a plurality of receiving terminal signal to noise ratios is defined as to the target signal to noise ratio of described user's down control channel; Perhaps, the undulating value of the receiving terminal signal to noise ratio of described value minimum and presence of intercell interference is defined as to the target signal to noise ratio of described user's down control channel with value; Perhaps, from described a plurality of receiving terminal signal to noise ratios, select the receiving terminal signal to noise ratio the most approaching with described received signal to noise ratio, and the received signal to noise ratio of choosing is defined as to the target signal to noise ratio of described user's down control channel; Perhaps, select the receiving terminal signal to noise ratio the most approaching with described received signal to noise ratio from described a plurality of receiving terminal signal to noise ratios, and the received signal to noise ratio chosen and described presence of intercell interference undulating value be defined as to the target signal to noise ratio of described user's down control channel with value;
The transmitting power determining unit, the described target signal to noise ratio of determining for the described received signal to noise ratio determined according to described received signal to noise ratio determining unit and described target signal to noise ratio unit, determine the transmitting power of described user's down control channel.
A kind of base station comprises: the aforementioned device for down control channel distribution power.
Adopt technical solution of the present invention, the corresponding descending channel information according to the user, determine the received signal to noise ratio of described user's down control channel; Determine the target signal to noise ratio of described user's down control channel; According to received signal to noise ratio and the target signal to noise ratio of described user's down control channel, determine the transmitting power of described user's down control channel.Adopt technical solution of the present invention, according to received signal to noise ratio and the target signal to noise ratio of user's down control channel, come to distribute transmitting power for this down control channel, thereby make the transmitting power of distributing for down control channel can guarantee the receiving ability of this down control channel, improve the reasonability of distributing power for down control channel, thereby improved the receptivity and the minizone co-channel interference that has reduced down control channel of each user's down control channel.
The accompanying drawing explanation
Fig. 1 distributes the method flow diagram of power for down control channel in the embodiment of the present invention;
Fig. 2 distributes the structural representation of the device of power for down control channel in the embodiment of the present invention.
The structural representation that Fig. 3 is base station in the embodiment of the present invention.
Embodiment
The above-mentioned technical problem existed for prior art, the embodiment of the present invention provides a kind of method, device and base station for down control channel distribution power, to be embodied as down control channel dynamic assignment power, distribute the reasonability of power to rise to down control channel, thereby improve the receptivity and the minizone co-channel interference that reduces down control channel of each user's down control channel.The method comprises: according to user's descending channel information, determine the received signal to noise ratio of described user's down control channel; Determine the target signal to noise ratio of described user's down control channel; According to described received signal to noise ratio and described target signal to noise ratio, determine the transmitting power of described user's down control channel.Adopt technical solution of the present invention, be embodied as down control channel dynamic assignment power, distribute the reasonability of power to rise to down control channel, thereby improve the receptivity and the minizone co-channel interference that reduces down control channel of each user's down control channel.
Below in conjunction with Figure of description, technical solution of the present invention is described in detail.
Referring to Fig. 1, for distribute the method flow diagram of power in the embodiment of the present invention for down control channel, the method comprises:
In step in 101, UE
icorresponding descending channel information comprises: UE
icorresponding PDSCH(Physical Downlink Share Channel, Physical Downlink Shared Channel) received signal to noise ratio SINR
receive_PDSCH (i).This SINR
receive_PDSCH (i)can determine according to following mode: obtain UE
ibroadband CQI(Channel Quality Information, channel quality information) information, and obtain CQI grade I from the broadband CQI information of obtaining
cQI(this I
cQIvalue is by UE
ireport and in base station side according to this UE
ithe transmission situation of historical data revise obtain); According to link simulation, determine and described I
cQIcorresponding SINR
receive_PDSCH (i).SINR in the embodiment of the present invention
receive_PDSCH (i)also can be called target BLER(Block Loss Error Ratio, Block Error Rate) under signal to noise ratio, this target BLER and UE
ithe target BLER of down control channel identical; Such as UE
ithe target BLER of down control channel be 1%, SINR
receive_PDSCH (i)for target BLER is the signal to noise ratio under 1%.
In above-mentioned steps 101, can be according to UE
isINR corresponding to PDSCH
receive_PDSCH (i)determine UE
ithe received signal to noise ratio SINR of down control channel
receive (i).Specifically can be as follows: by described SINR
receive_PDSCH (i)be defined as the received signal to noise ratio SINR of down control channel
receive (i), i.e. SINR
receive (i)=SINR
receive_PDSCH (i); Perhaps, for considering coded system difference, code length difference, the antenna transmission mode difference between PDSCH and down control channel, to the received signal to noise ratio SINR of described PDSCH
receive_PDSCH (i)revised or reconstruct, obtained the received signal to noise ratio SINR that received signal to noise ratio is defined as down control channel
receive (i), can be as shown in the formula shown in (1):
SINR
receive (i)=g(SINR
receive_PDSCH (i))=SINR
receive_PDSCH (i)-δ
diff_channel (i)formula (1)
In formula (1), SINR
receive (i)for UE
ithe received signal to noise ratio of down control channel, SINR
receive_PDSCH (i)for UE
ireceived signal to noise ratio corresponding to PDSCH, δ
diff_channel (i)for correction value, this correction value is for compensating UE
ipDSCH and coded system difference, code length difference, the antenna transmission mode difference of down control channel, concrete can determine and obtain according to link simulation.
In the step 102 of above-mentioned flow process, determine UE
ithe target signal to noise ratio SINR of down control channel
target (i), can be in the following ways: choose DCI form and multiple polymerization grade (as chosen 1,2,4,8 polymerization grade); For every kind of polymerization grade, determine described DCI form and adopt this kind of needed receiving terminal signal to noise ratio of polymerization grade, as the mode that can adopt link simulation obtains the receiving terminal signal to noise ratio; According to this, obtain a plurality of and described multiple polymerization grade a plurality of receiving terminal signal to noise ratios one to one; Determine described UE according to described a plurality of receiving terminal signal to noise ratios
ithe target signal to noise ratio SINR of down control channel
target (i).
Determine UE according to described a plurality of receiving terminal signal to noise ratios
ithe target signal to noise ratio SINR of down control channel
target (i), can adopt following four kinds of modes to obtain:
Mode one, directly the receiving terminal signal to noise ratio of value minimum in a plurality of receiving terminal signal to noise ratios (is supposed to the receiving terminal signal to noise ratio SINR that polymerization grade l is corresponding
target_aggre_lthe value minimum) be defined as UE
ithe target signal to noise ratio SINR of down control channel
target (i).
Mode two, by the receiving terminal signal to noise ratio SINR of value minimum
target_aggre_lwith presence of intercell interference undulating value δ
depravationand value, be defined as the target signal to noise ratio SINR of described user's down control channel
target (i), can be as shown in the formula shown in (2):
SINR
target (i)=SINR
target_aggre_l+ δ
depravationformula (2)
In formula (2), SINR
target (i)for UE
ithe target signal to noise ratio of down control channel, SINR
target_aggre_lfor receiving terminal signal to noise ratio corresponding to polymerization grade l, δ
depravationfor the presence of intercell interference undulating value, this δ
depravationfor compensating the fluctuation of introducing the presence of intercell interference that the down control channel power distribution strategies brings.
Mode three, from described a plurality of receiving terminal signal to noise ratios, select and UE
isINR
receive (i)the most approaching receiving terminal signal to noise ratio (is supposed the receiving terminal signal to noise ratio SINR that polymerization grade k is corresponding
target_aggre_kwith UE
isINR
receive (i)the most approaching), and by the received signal to noise ratio SINR chosen
target_aggre_kbe defined as the target signal to noise ratio SINR of described user's down control channel
target (i), i.e. SINR
target (i)=SINR
target_aggre_k.
Mode four, select the receiving terminal signal to noise ratio the most approaching with described received signal to noise ratio (suppose the receiving terminal signal to noise ratio SINR that polymerization grade k is corresponding from described a plurality of receiving terminal signal to noise ratios
target_aggre_kwith UE
isINR
receive (i)the most approaching), and by the received signal to noise ratio SINR chosen
target_aggre_kwith presence of intercell interference undulating value δ
depravationand value, be defined as the target signal to noise ratio SINR of described user's down control channel
target (i), can be as shown in the formula shown in (3):
SINR
target (i)=SINR
target_aggre_k+ δ
depravationformula (3)
In formula (3), SINR
target (i)for UE
ithe target signal to noise ratio of down control channel, SINR
target_aggre_kfor receiving terminal signal to noise ratio corresponding to polymerization grade k, δ
depravationfor the presence of intercell interference undulating value, this δ
depravationfor compensating the fluctuation of introducing the presence of intercell interference that the down control channel power distribution strategies brings.
In the step 103 of above-mentioned flow process, determine UE
ithe transmitting power of down control channel
comprise:
For UE
idown control channel in each physical resource particle group REG
m(supposing that down control channel comprises M REG), determine and distribute to this physical resource particle group REG according to the rated power of base station
mpower P
uniform_allocation(m); According to UE
ithe target signal to noise ratio SINR of down control channel
target (i)with received signal to noise ratio SINR
receive (i)difference (SINR
target (i)-SINR
receive (i)) and P
uniform_allocation(m)determine and need to distribute to REG
mtransmitting power P
dyn_PA(m), as by (SINR
target (i)-SINR
receive (i)) and P
uniform_allocation(m)be defined as distributing to REG with value
mtransmitting power P
dyn_PA(m).The embodiment of the present invention is for target signal to noise ratio SINR
target (i)with received signal to noise ratio SINR
receive (i)magnitude relationship, can basis | SINR
target (i)-SINR
receive (i)| and P
uniform_allocation(m), determine and need to distribute to REG
mtransmitting power P
dyn_PA(m); By UE
idown control channel in transmitting power corresponding to all REG and the value transmitting power that is defined as down control channel
can be as shown in the formula shown in (4):
Above-mentioned according to UE
idown control channel received signal to noise ratio SINR
receive (i)with target signal to noise ratio SINR
target (i)difference | SINR
target (i)-SINR
receive (i)| and P
uniform_allocation(m), determine and distribute to REG
mtransmitting power P
dyn_PA(m), can be as follows:
Work as SINR
receive (i)>=SINR
target (i)the time, determine and distribute to REG
mtransmitting power P
dyn_PA(m)can be as shown in the formula shown in (5):
P
dyn_PA (m)=P
uniform_allocation(m)-| SINR
target (i)-SINR
receive (i)| formula (5);
Work as SINR
receive (i)<SINR
target (i)the time, determine and distribute to REG
mtransmitting power P
dyn_PA(m)can be as shown in the formula shown in (6):
P
dyn_PA (m)=P
uniform_allocation(m)+ | SINR
target (i)-SINR
receive (i)| formula (6).
In above-mentioned formula (5) and formula (6), P
dyn_PA (m)for distributing to REG
mtransmitting power, P
uniform_allocation(m)for the rated power according to base station is distributed to REG
mpower, | SINR
target (i)-SINR
receive (i)| be received signal to noise ratio SINR
receive (i)with target signal to noise ratio SINR
target (i)difference.
Preferably, the down control channel in the embodiment of the present invention is the PDCCH channel.
Preferably, above-mentioned flow process can also comprise:
UE is determined in the link circuit self-adapting unit
ithe PDCCH form, can obtain in the following ways: according to UE
ithe target signal to noise ratio SINR of down control channel
target (i), determine UE
ithe highest code check CR of current support
uE (i); According to the highest code check CR
uE (i)and UE
ithe bit length of DCI information, determine UE
ithe PDCCH form.
In the embodiment of the present invention, determining UE
ithe PDCCH form after, can also be according to UE
irNTI (Radio Network Temporary Identity, Radio Network Temporary Identifier) and current time slots number determine corresponding polymerization grade (this polymerization grade refers to aforementioned for determining the polymerization grade corresponding to receiving terminal signal to noise ratio of target signal to noise ratio) lower PDCCH search volume; And divide timing carrying out the PDCCH resource, find available resources in the PDCCH search volume of this polymerization grade and complete the PDCCH resource and distribute.
In the embodiment of the present invention, for the time domain scheduling output uplink and downlink UE queue in each UE, according to MIMO(Multiple-Input Multiple-Out-put in present mode, multiple-input and multiple-output) result of the selection of mode or switching, determine the DCI format that this UE is used, and determine the information bit number of the DCI format that described UE uses according to system bandwidth, antenna port number, system duplex mode.As: at FDD(Frequency Division Duplex, Frequency Division Duplexing (FDD)) in system, system bandwidth is 20M, the antenna port number is 2, determines that PDCCH resource (the PDCCH resource means by CCE quantity) required after the information bit number of each DCI format and 1/3 convolutional encoding is as shown in table 2; At TDD((Time Division Duplex, time division duplex) in system, system bandwidth is 20M, and the antenna port number is 2, determines that PDCCH resource (the PDCCH resource means by CCE quantity) required after the information bit number of each DCI format and 1/3 convolutional encoding is as shown in table 3.
Table 2 is the signal table of the information bit number that is 20M, the antenna port various DCI format that are 2 o'clock of system bandwidth in the FDD system
| DCI?format | Information bit number | Data b it number after coding/CCE number |
| 0 | 28 | 84/2 |
| 1 | 39 | 117/2 |
| 1A | 28 | 84/2 |
| 1B | 30 | 90/2 |
| 1C | 15 | 45/4 |
| 1D | 30 | 90/2 |
| 2 | 51 | 153/4 |
| 2A | 48 | 144/2 |
| 2B | 48 | 144/2 |
| 3/3A | 28 | 84/2 |
Table 3 is in the TDD system, and system bandwidth is 20M, and the information bit that antenna port is 2 o'clock various DCIformat counts the signal table
| DCI?format | Information bit number | Data b it number after coding/ |
| C | ||
| 31 | 93/2 | |
| 1 | 42 | 126/2 |
| |
31 | 93/2 |
| 2 | 54 | 162/4 |
| 2A | 51 | 153/4 |
| 3/ |
31 | 93/2 |
| 1E | 33 | 99/2 |
| 1C | 13 | 39/4 |
| 1D | 33 | 99/2 |
In above-mentioned table 2 and table 3, while due to DCI format form, being 1C, only support public search space, therefore minimum CCE number is 4.
The identical design based on the said method flow process, it is a kind of for down control channel distributes the device of power that the embodiment of the present invention also provides, and the structure of this device is as shown in Figure 2.
Referring to Fig. 2, for distribute the structural representation of the device of power in the embodiment of the present invention for down control channel, this device comprises:
Received signal to noise ratio determining unit 21, for the descending channel information according to the user, determine the received signal to noise ratio of described user's down control channel;
Target signal to noise ratio determining unit 22, for the target signal to noise ratio of the down control channel of determining described user;
Transmitting power determining unit 23, the described target signal to noise ratio of determining for the described received signal to noise ratio determined according to received signal to noise ratio determining unit 21 and target signal to noise ratio unit 22, determine the transmitting power of described user's down control channel.
Preferably, received signal to noise ratio determining unit 21 is specifically for the received signal to noise ratio of determining described down control channel according to the received signal to noise ratio of Physical Downlink Shared Channel PDSCH in described descending channel information.
Received signal to noise ratio determining unit 21 specifically for: according to the coded system difference between described PDSCH and described down control channel, code length difference, antenna transmission mode difference, the received signal to noise ratio of described PDSCH is revised or reconstruct, obtain the received signal to noise ratio that received signal to noise ratio is described down control channel, concrete adopted aforementioned manner, do not repeat them here.
Preferably, target signal to noise ratio determining unit 22 specifically for: choose DCI form and multiple polymerization grade; For every kind of polymerization grade, determine described DCI form and adopt this kind of needed receiving terminal signal to noise ratio of polymerization grade; According to this, obtain a plurality of and described multiple polymerization grade a plurality of receiving terminal signal to noise ratios one to one; Determine the target signal to noise ratio of described user's down control channel according to described a plurality of receiving terminal signal to noise ratios.
Preferably, target signal to noise ratio determining unit 22 is specifically for the target signal to noise ratio that the receiving terminal signal to noise ratio of value minimum in described a plurality of receiving terminal signal to noise ratios is defined as to described user's down control channel; Perhaps, the undulating value of the receiving terminal signal to noise ratio of described value minimum and presence of intercell interference is defined as to the target signal to noise ratio of described user's down control channel with value; Perhaps, from described a plurality of receiving terminal signal to noise ratios, select the receiving terminal signal to noise ratio the most approaching with described received signal to noise ratio, and the received signal to noise ratio of choosing is defined as to the target signal to noise ratio of described user's down control channel; Perhaps, select the receiving terminal signal to noise ratio the most approaching with described received signal to noise ratio from described a plurality of receiving terminal signal to noise ratios, and the received signal to noise ratio chosen and described presence of intercell interference undulating value be defined as to the target signal to noise ratio of described user's down control channel with value.Above-mentioned several mode can as previously mentioned, not repeat them here.
Preferably, transmitting power determining unit 23 specifically for: for each physical resource particle group in described user's down control channel, according to the rated power of base station, determine and the first transmitting power of distributing to this physical resource particle group; According to difference and described first transmitting power of described received signal to noise ratio and described target signal to noise ratio, determine the second transmitting power that need to distribute to described physical resource particle group; By each physical resource particle group in described user's down control channel, corresponding the second transmitting power is defined as the transmitting power of described down control channel with value.
Preferably, transmitting power determining unit 23 is determined the second transmitting power that need to distribute to described physical resource particle group, specifically for: by described difference and described the first transmitting power addition, what obtain is defined as distributing to the second transmitting power of described physical resource particle group with value.
Preferably, target signal to noise ratio determining unit 22 sends to the target signal to noise ratio of the described user's that determines down control channel the link circuit self-adapting unit of base station, so that described link circuit self-adapting unit is according to described target signal to noise ratio, determine the highest code check of the current support of described user, and determine described user's PDCCH form according to the length of the highest described code check and described DCI information.
The embodiment of the present invention also provides in ，Gai base station, a kind of base station and is provided with the above-mentioned device for down control channel distribution power.
In the embodiment of the present invention, base station can also comprise the link circuit self-adapting unit 31 be connected with the target signal to noise ratio determining unit 22 of described device, the resource allocation unit 32 be connected with transmitting power determining unit 23, and the structure of this base station can be as shown in Figure 3, wherein:
Link circuit self-adapting unit 31, the target signal to noise ratio of the user's who sends for receiving target signal to noise ratio determining unit 22 down control channel, and, according to the DCI information of the down control channel carrying of this target signal to noise ratio and described user terminal, determine the PDCCH form;
Link circuit self-adapting unit 31 in the embodiment of the present invention and the functional unit of resource allocation unit 32 for having realized in the prior art base station, do not repeat them here.
Adopt technical solution of the present invention, according to user's descending channel information, determine the received signal to noise ratio of described user's down control channel; Determine the target signal to noise ratio of described user's down control channel; According to received signal to noise ratio and the target signal to noise ratio of described user's down control channel, determine the transmitting power of described user's down control channel.Adopt technical solution of the present invention, according to received signal to noise ratio and the target signal to noise ratio of user's down control channel, come to distribute transmitting power for this down control channel, thereby make the transmitting power of distributing for down control channel can guarantee the receiving ability of this down control channel, improved the reasonability of distributing power for down control channel, thereby the receptivity and the minizone co-channel interference that has reduced down control channel of each user's down control channel have been improved, promote cell spectrum efficiency, improved the reliability and stability of carrying out identical networking in the LTE system.
Obviously, those skilled in the art can carry out various changes and modification and not break away from the spirit and scope of the present invention the present invention.Like this, if within of the present invention these are revised and modification belongs to the scope of the claims in the present invention and equivalent technologies thereof, the present invention also is intended to comprise these changes and modification interior.
Claims (13)
1. the method for down control channel distribution power, is characterized in that, comprising:
According to user's descending channel information, determine the received signal to noise ratio of described user's down control channel;
Choose Downlink Control Information DCI form and multiple polymerization grade;
For every kind of polymerization grade, determine described DCI form and adopt this kind of needed receiving terminal signal to noise ratio of polymerization grade; According to this, obtain a plurality of and described multiple polymerization grade a plurality of receiving terminal signal to noise ratios one to one;
The receiving terminal signal to noise ratio of value minimum in described a plurality of receiving terminal signal to noise ratios is defined as to the target signal to noise ratio of described user's down control channel; Perhaps, by the undulating value of the receiving terminal signal to noise ratio of described value minimum and presence of intercell interference and value, be defined as the target signal to noise ratio of described user's down control channel; Perhaps, from described a plurality of receiving terminal signal to noise ratios, select the receiving terminal signal to noise ratio the most approaching with described received signal to noise ratio, and the received signal to noise ratio of choosing is defined as to the target signal to noise ratio of described user's down control channel; Perhaps, select the receiving terminal signal to noise ratio the most approaching with described received signal to noise ratio from described a plurality of receiving terminal signal to noise ratios, and by the received signal to noise ratio chosen and described presence of intercell interference undulating value and value, be defined as the target signal to noise ratio of described user's down control channel;
According to described received signal to noise ratio and described target signal to noise ratio, determine the transmitting power of described user's down control channel.
2. the method for claim 1, is characterized in that, described descending channel information comprises the received signal to noise ratio of described user's Physical Downlink Shared Channel PDSCH;
Determine the received signal to noise ratio of described user's down control channel, comprising:
According to the coded system difference between described PDSCH and described down control channel, code length difference, antenna transmission mode difference, the received signal to noise ratio of described PDSCH is revised or reconstruct, obtained the received signal to noise ratio that received signal to noise ratio is defined as described down control channel.
3. the method for claim 1, is characterized in that, the described transmitting power of determining described user's down control channel comprises:
For each physical resource particle group in described user's down control channel, according to the rated power of base station, determine and the first transmitting power of distributing to this physical resource particle group; According to the difference of described target signal to noise ratio and described received signal to noise ratio, described the first transmitting power, determine the second transmitting power that need to distribute to described physical resource particle group;
By each physical resource particle group in described user's down control channel, corresponding the second transmitting power is defined as the transmitting power of described down control channel with value.
4. method as claimed in claim 3, is characterized in that, described the second transmitting power that need to distribute to described physical resource particle group of determining comprises:
By described difference and described the first transmitting power addition, what obtain is defined as distributing to the second transmitting power of described physical resource particle group with value.
5. method as described as claim 1～4 any one, is characterized in that, described down control channel is physical downlink control channel PDCCH.
6. method as claimed in claim 5, is characterized in that, also comprises:
The target signal to noise ratio of described user's down control channel is sent to the link circuit self-adapting unit of base station, so that described user's PDCCH form is determined in described link circuit self-adapting unit according to described target signal to noise ratio.
7. method as claimed in claim 6, is characterized in that, the described PDCCH form of determining described user comprises:
According to described target signal to noise ratio, determine the highest code check of the current support of described user;
Determine described user's PDCCH form according to the bit length of the highest described code check and described user's DCI.
8. the device for down control channel distribution power, is characterized in that, comprising:
The received signal to noise ratio determining unit, for the descending channel information according to the user, determine the received signal to noise ratio of described user's down control channel;
The target signal to noise ratio determining unit, for choosing Downlink Control Information DCI form and multiple polymerization grade; For every kind of polymerization grade, determine described DCI form and adopt this kind of needed receiving terminal signal to noise ratio of polymerization grade; According to this, obtain a plurality of and described every kind of polymerization grade a plurality of receiving terminal signal to noise ratios one to one; The receiving terminal signal to noise ratio of value minimum in described a plurality of receiving terminal signal to noise ratios is defined as to the target signal to noise ratio of described user's down control channel; Perhaps, the undulating value of the receiving terminal signal to noise ratio of described value minimum and presence of intercell interference is defined as to the target signal to noise ratio of described user's down control channel with value; Perhaps, from described a plurality of receiving terminal signal to noise ratios, select the receiving terminal signal to noise ratio the most approaching with described received signal to noise ratio, and the received signal to noise ratio of choosing is defined as to the target signal to noise ratio of described user's down control channel; Perhaps, select the receiving terminal signal to noise ratio the most approaching with described received signal to noise ratio from described a plurality of receiving terminal signal to noise ratios, and the received signal to noise ratio chosen and described presence of intercell interference undulating value be defined as to the target signal to noise ratio of described user's down control channel with value;
The transmitting power determining unit, the described target signal to noise ratio of determining for the described received signal to noise ratio determined according to described received signal to noise ratio determining unit and described target signal to noise ratio unit, determine the transmitting power of described user's down control channel.
9. device as claimed in claim 8, it is characterized in that, the received signal to noise ratio determining unit specifically for: according to user's Physical Downlink Shared Channel PDSCH and the coded system difference between described down control channel, code length difference, antenna transmission mode difference, the received signal to noise ratio of described PDSCH is revised or reconstruct, obtain the received signal to noise ratio that received signal to noise ratio is described down control channel, the received signal to noise ratio of user's PDSCH is contained in user's descending channel information.
10. device as claimed in claim 8, it is characterized in that, the transmitting power determining unit specifically for: for each physical resource particle group in described user's down control channel, according to the rated power of base station, determine and the first transmitting power of distributing to this physical resource particle group; According to difference and described first transmitting power of described received signal to noise ratio and described target signal to noise ratio, determine the second transmitting power that need to distribute to described physical resource particle group;
By each physical resource particle group in described user's down control channel, corresponding the second transmitting power is defined as the transmitting power of described down control channel with value.
11. device as claimed in claim 10, is characterized in that, described transmitting power determining unit is determined the second transmitting power that need to distribute to described physical resource particle group, specifically for:
By described difference and described the first transmitting power addition, what obtain is defined as distributing to the second transmitting power of described physical resource particle group with value.
12. device as described as claim 8～11 any one, it is characterized in that, described target signal to noise ratio determining unit sends to the target signal to noise ratio of the described user's that determines down control channel the link circuit self-adapting unit of base station, so that described link circuit self-adapting unit is according to described target signal to noise ratio, determine the highest code check of the current support of described user, and determine described user's PDCCH form according to the bit length of the highest described code check and described user's DCI.
13. a base station, is characterized in that, comprises device as described as claim 8～12 any one.
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| CN103108361B (en) * | 2011-11-09 | 2016-10-26 | 上海贝尔股份有限公司 | The method that down link self adaption parameter in wireless communications network base station is arranged |
| CN102412950A (en) * | 2011-11-15 | 2012-04-11 | 中兴通讯股份有限公司 | Coordination system of power of downlink control channel and method thereof |
| CN103188784B (en) * | 2011-12-28 | 2016-01-13 | 中国电信股份有限公司 | The power distribution method of a kind of PDCCH, base station and mobile communication system |
| CN103369651A (en) * | 2012-03-29 | 2013-10-23 | 中兴通讯股份有限公司 | Method for allocating downlink transmission power in long-term evolution system and device thereof |
| CN103369582B (en) | 2012-04-06 | 2016-08-03 | 中兴通讯股份有限公司 | The Physical Downlink Control Channel qualitative forecasting method of long evolving system and device |
| EP2938145B1 (en) * | 2013-01-18 | 2017-03-15 | Huawei Technologies Co., Ltd. | Method and device for determining epdcch candidate |
| CN105247937A (en) * | 2013-08-30 | 2016-01-13 | 华为技术有限公司 | Downlink channel aggregation level determination method, device and system |
| CN104754714A (en) * | 2013-12-30 | 2015-07-01 | 中兴通讯股份有限公司 | Method and device for determining sending power of switchover command and base station |
| CN110392390B (en) * | 2018-04-23 | 2021-09-14 | 华为技术有限公司 | Wireless local area network transmission power setting method and device and wireless access point |
| CN113037442B (en) * | 2019-12-24 | 2022-04-05 | 大唐移动通信设备有限公司 | Method and device for adjusting CCE aggregation level of control channel unit |
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