CN101674654A - PDCCH channel encoding rate regulation method and evolution base station - Google Patents
PDCCH channel encoding rate regulation method and evolution base station Download PDFInfo
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Abstract
The invention discloses a PDCCH channel encoding rate regulation method and an evolution base station, relating to the field of mobile communication. The method comprises the following steps: obtaining the radio link quality information of user equipment; according to the radio link quality information of user equipment, determining a link quality regulation zone to which the radio link quality ofthe user equipment belongs; and according to the link quality regulation zone, regulating the PDCCH channel encoding rate occupied by the user equipment. The base station comprises an acquisition module and a regulation module so as to reasonably choose the PDCCH channel encoding rate according to the practical condition of the current user equipment link quality, thus improving the utilization efficiency of controlling resource. Specifically, the embodiment of the invention improves the efficiency for the PDCCH channel to transmit scheduling Information to a user, thus improving the user number simultaneously scheduled by the same TTI and reducing the waiting time delay of user data on the sending side.
Description
Technical field
The present invention relates to moving communicating field, particularly a kind of PDCCH channel encoding rate regulation method and evolution base station.
Background technology
LTE (Long Term Evolution, Long Term Evolution) technology adopts the network configuration of flattening on network configuration, promptly only keep eNodeB (evolved Node B in the Access Network side, evolution base station) node, cancelled RNC (the Radio Network Controller in traditional UTRAN network configuration, radio network controller) node, the radio resource management function that former cause RNC node is finished is finished by the eNodeB node.
The LTE system all adopts the mode of shared channel to carry user's up-downgoing transfer of data in up-downgoing, and this bearing mode can utilize limited running time-frequency resource fully.In the shared channel system, unify to control and dispatch the channel resource that is used for carrying user data by eNodeB.Before carrying out user data transmission, eNodeB utilizes control channel that the schedule information (for example resource allocation information, transport format information, power control information etc.) of necessity is transferred to subscriber equipment.Wherein, PDCCH (PhysicalDownlink Control Channel, downlink physical control channel) is exactly the control channel that is used for schedule informations such as transmission user resource allocation in the LTE system.To the subscriber equipment at diverse location place, its link-quality is different, and usually, from the near more subscriber equipment of eNodeB, its link-quality is high more, and from eNodeB subscriber equipment far away more, its link-quality is low more.
Usually, on the PDCCH channel, can select for use certain encoding rate to carry user's schedule information.Wherein, encoding rate is high more, and CCE (Control Channel Element, the control channel element) quantity that is used to carry user's schedule information is few more.If the encoding rate of selecting for use is too high,, be difficult to guarantee the correctness of transfer of data for the lower situation of user equipment link quality; And if the encoding rate of selecting for use is low excessively,, then can cause the waste of control resource for user equipment link quality condition with higher.
In implementing process of the present invention, the inventor finds: press for a kind of PDCCH channel encoding rate adjustment technology at present, the encoding rate of choose reasonable PDCCH channel carries schedule information.
Summary of the invention
The embodiment of the invention provides a kind of PDCCH channel encoding rate regulation method and evolution base station, reasonably to select the encoding rate of PDCCH channel.
On the one hand, provide a kind of PDCCH channel encoding rate regulation method, described method comprises:
Obtain radio link quality information of user equipment;
Determine that according to described radio link quality information link-quality under the radio link quality of described subscriber equipment adjusts intervally, the encoding rate of the PDCCH channel that described subscriber equipment is taken according to described link-quality adjustment interval is adjusted.
On the other hand, provide a kind of evolution base station eNodeB, having comprised:
Acquisition module is used to obtain radio link quality information of user equipment;
Adjusting module, be used for determining that according to the radio link quality information that described acquisition module obtains link-quality under the radio link quality of described subscriber equipment adjusts intervally, the encoding rate of the PDCCH channel that described subscriber equipment is taken according to described link-quality adjustment interval is adjusted.
A kind of PDCCH channel encoding rate regulation method and evolution base station that the embodiment of the invention provides, according to radio link quality information of user equipment, determine the affiliated link-quality adjustment interval of radio link quality of this subscriber equipment, the encoding rate of the PDCCH channel that this subscriber equipment is taken according to described link-quality adjustment interval is adjusted, thereby realize actual state according to the current user equipment link-quality, the encoding rate of choose reasonable PDCCH channel, and then improve the control efficiency of resource.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, to do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 provides a kind of PDCCH channel encoding rate regulation method schematic flow sheet for the embodiment of the invention;
Fig. 2 provides another kind of PDCCH channel encoding rate regulation method schematic flow sheet for the embodiment of the invention;
Fig. 3 provides another kind of PDCCH channel encoding rate regulation method schematic flow sheet for the embodiment of the invention;
Fig. 4 provides also a kind of PDCCH channel encoding rate regulation method schematic flow sheet for the embodiment of the invention;
A kind of evolution base station structured flowchart that Fig. 5 provides for the embodiment of the invention;
Fig. 6 is a kind of structured flowchart of adjusting module in the embodiment of the invention;
Fig. 7 is the another kind of structured flowchart of adjusting module in the embodiment of the invention;
Fig. 8 is a kind of structured flowchart of acquisition module in the embodiment of the invention;
Fig. 9 is the another kind of structured flowchart of acquisition module in the embodiment of the invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that is obtained under the creative work prerequisite.
For making the purpose, technical solutions and advantages of the present invention clearer, embodiment of the present invention is described further in detail below in conjunction with accompanying drawing.
Referring to Fig. 1, the embodiment of the invention provides a kind of PDCCH channel encoding rate regulation method, comprises the steps:
S101:eNodeB (evolution base station) obtains radio link quality information of user equipment.
Wherein, described radio link quality information of user equipment is the relevant parameter that is used to embody the radio link quality of subscriber equipment, such as subscriber equipment path loss or user apparatus service channel effective spectrum efficient etc.
S102:eNodeB determines that according to above-mentioned radio link quality information the link-quality under the link-quality of this subscriber equipment adjusts intervally, and the encoding rate of the PDCCH channel that this subscriber equipment is taken according to described link-quality adjustment interval is adjusted.
Usually, in evolution base station, in advance each link-quality adjustment interval is set, like this, in application, just can adjust in real time the encoding rate of PDCCH channel according to each radio link quality information of user equipment, all each link-quality adjustment interval is provided with and need not to carry out when the PDCCH channel encoding rate is adjusted at every turn.
Generally speaking, can be provided with each link-quality and adjust interval corresponding encoding rate adjustment mode, adjust interval corresponding codes rate adjustment mode such as setting certain link-quality, if the radio link quality of subscriber equipment is in this interval, adjust with regard to the encoding rate that adopts the PDCCH channel that mode that should link-quality adjustment interval is taken this subscriber equipment.
The PDCCH channel encoding rate regulation method that the embodiment of the invention provides can be applied in the LTE system, before carrying out user data transmission, eNodeB can utilize the PDCCH channel with the schedule information of necessity (resource allocation information for example, transport format information, power control information etc.) be transferred to subscriber equipment, wherein the PDCCH channel adopts the shared channel transmission means, the PDCCH channel encoding rate regulation method that utilizes the embodiment of the invention to provide, according to the radio link quality situation of different user devices, the PDCCH channel encoding rate that this subscriber equipment takies is dynamically adjusted.Be understandable that in the practical application, the PDCCH channel encoding rate regulation method that the embodiment of the invention provides is not limited only to above-mentioned application scenarios.
As seen, the PDCCH channel encoding rate regulation method that the embodiment of the invention provides, according to the radio link quality information of user equipment of obtaining, determine the affiliated link-quality adjustment interval of radio link quality of this subscriber equipment, the encoding rate of the PDCCH channel that this subscriber equipment is taken according to described link-quality adjustment interval is adjusted, thereby realize actual state according to the current user equipment link-quality, the encoding rate of choose reasonable PDCCH channel, and then improve the control efficiency of resource.
Concrete beneficial effect can show as, improved the efficient of PDCCH channel to the user device transmissions schedule information, that is to say, improve same TTI (Transmit Time Interval, the number of users of dispatching simultaneously Transmission Time Interval) reduces the wait time delay of user data at transmitter side.
Referring to Fig. 2, in one embodiment of the invention, be that the path loss values of current user equipment is an example with the radio link quality information of current user equipment, the PDCCH channel encoding rate regulation method is described, comprise the steps:
S201: set link-quality and adjust interval.
Suppose to set 3 path loss threshold values, be respectively PL
Th1, PL
Th2, PL
Th3, PL wherein
Th1＜PL
Th2＜PL
Th3, then by determining 4 path loss range, be respectively:＜PL according to these 3 path loss threshold values
Th1, PL
Th1～PL
Th2, PL
Th2～PL
Th3,＞PL
Th3
The interval concrete value of this adjustment can rule of thumb set in advance on eNodeB.
S202: set up the corresponding codes rate for link-quality adjustment interval and adjust mode.
Adjust interval corresponding codes rate for the interval foundation of each above-mentioned adjustment with this and adjust mode.
For example, referring to table 1, PL is the path loss values of current user equipment, adjusts interval foundation for each herein and adjusts interval corresponding codes rate adjustment mode with this and can be:
Table 1
| Adjust interval | The encoding rate desired value |
| ??PL≤PL th1 | ??1 |
| ??PL th1＜PL≤PL th2 | ??2 |
| ??PL th2＜PL≤PL th3 | ??4 |
| ??PL＞PL th3 | ??8 |
Wherein, the desired value of encoding rate represents that the CCE with the desired value respective amount carries user's schedule information.
S203:eNodeB obtains PHR (Power Head Room, the through-put power surplus) information that current user equipment reports.
After UE (ustomer premises access equipment) set up wireless connections with eNodeB, UE can trigger by number of mechanisms and report PHR information to the LTE system.Such as adopting threshold trigger when surpassing default thresholding, to trigger the PHR information etc. that reports.
S204:eNodeB obtains the path loss values PL of current user equipment according to described PHR information.
PHR information is used to represent maximum this data transfer desired power that allows power output to deduct the UE estimation of subscriber equipment, promptly the expression 1 of PHR can for:
PHR=P
Max-{ 10log
10(M
PUSCH(i))+P
0_PUSCH+ α PL+ Δ
TF(i)+and f (i) } formula 1
Wherein i represents that UE reports the subframe numbering of PHR information;
PL is the path loss parameter of current UE, and unit is dB;
P
MaxMaximum permission power output for subscriber equipment;
M
PUSCH(i) up RB (Resource Block) number that this subscriber equipment is assigned with in the subframe that reports of expression PHR information;
P
0_PUSCH=P
0_nominal_PUSCH+ P
0_UE_PUSCH, P wherein
0_nominal_PUSCHBe a cell-level parameter by eNodeB broadcasting, P
0_UE_PUSCHBe in the initial link setup process of user, to dispose parameter to UE (ustomer premises access equipment) by eNodeB;
α is a cell-level parameter by eNodeB broadcasting;
Δ
TF(i) be that PHR information reports the employed transformat of PUSCH in the subframe (Physical Uplink Shared Channel, Physical Uplink Shared Channel), dispose to UE (ustomer premises access equipment) by eNodeB;
F (i) is that parameter is adjusted in power control, sends to UE by the eNodeB node.
Then, the PHR information that the eNodeB lateral root reports according to each UE just can calculate the information on path loss PL of current UE, computing formula as shown in Equation 2, it can carry out mathematic(al) manipulation by above-mentioned formula 1 and obtain:
PL={P
Max-PHR-10log
10(M
PUSCH(i))-P
0_PUSCH-Δ
TF(i)-f (i) }/α formula 2
S205:eNodeB determines that according to the radio link quality information of current user equipment the link-quality under the radio link quality of described subscriber equipment adjusts intervally, and the encoding rate of the PDCCH channel that described subscriber equipment is taken according to described link-quality adjustment interval is adjusted.
For example, if the path loss values PL＜PL of current user equipment
Th1, then according to adjust interval＜PL
Th1Corresponding encoding rate is adjusted mode, and the encoding rate of PDCCH channel is adjusted, and the encoding rate that is about to the PDCCH channel is adjusted into desired value 1, carries user's schedule information with 1 CCE;
In like manner, if PL
Th1＜PL＜PL
Th2, then the encoding rate with the PDCCH channel is adjusted into desired value 2, promptly carries user's schedule information with 2 CCE;
If PL
Th2＜PL＜PL
Th3, then the encoding rate with the PDCCH channel is adjusted into desired value 4, promptly carries user's schedule information with 4 CCE;
If PL＞PL
Th3, then the encoding rate with the PDCCH channel is adjusted into desired value 8, promptly carries user's schedule information with 8 CCE.
Owing to be used for the channel resource of carrying user data in the LTE system is to unify control and scheduling by eNodeB.So for same UE, this UE is identical with the loss of PDCCH channel path with the Traffic Channel path loss of this subscriber equipment of eNodeB determining positions.
Here, the size of information on path loss, the link quality information that can reflect subscriber equipment, when the information on path loss value PL of subscriber equipment more little, illustrate that then subscriber equipment is near more from the distance of eNodeB, such as center of housing estate, the link-quality of its subscriber equipment is good more, can select high more encoding rate this moment, promptly carry user's control information with less CCE, so not only can improve the control efficiency of resource, and can promote the number of users of dispatching simultaneously in the same TTI, reduce the wait time delay of user data; Otherwise, when the information on path loss value PL of subscriber equipment big more, illustrate that then subscriber equipment is far away more from the distance of eNodeB, such as cell edge, the link-quality of its subscriber equipment is poor more, and can select lower encoding rate this moment, promptly carries user's control information with more CCE, improve the transmission quality of control channel like this, satisfy the requirement that control channel covers.
As seen, the PDCCH channel encoding rate regulation method that the embodiment of the invention provides, according to the subscriber equipment current path loss value that obtains, determine the affiliated link-quality adjustment interval of radio link quality of this subscriber equipment, the encoding rate of the PDCCH channel that this subscriber equipment is taken according to described link-quality adjustment interval is adjusted, thereby realize actual state according to the current user equipment link-quality, the encoding rate of choose reasonable PDCCH channel, and then improve the control efficiency of resource.
Concrete beneficial effect can show as, improved the efficient of PDCCH channel to the user device transmissions schedule information, that is to say, improve same TTI (Transmit Time Interval, the number of users of dispatching simultaneously Transmission Time Interval) reduces the wait time delay of user data at transmitter side.
Referring to Fig. 3, in another embodiment of the present invention, be that the Traffic Channel effective spectrum efficiency value of current user equipment is an example with the radio link quality information of current user equipment, the PDCCH channel encoding rate regulation method is described, comprise the steps:
S301: set link-quality and adjust interval.
Suppose to set 3 PDCCH channel effective spectrum efficiency value Eff
PDCCH_i, i=1,2,4 wherein represents the CCE number of bear control information respectively, promptly respectively expression with 1 CCE carry the user control information, carry user's control information, carry user's control information with 4 CCE with 2 CCE.
For the PDCCH channel, PDCCH channel effective spectrum efficiency value Eff
PDCCH_iThere is following formula:
Eff
PDCCH_i=2 * CodeRate
PDCCH_i* (1-BLER
Target_PDCCH) formula 3
Wherein, BLER
Target_PDCCHThe block error probability desired value of expression PDCCH channel, default value is 0.01 usually.
In formula 3, because the PDCCH channel modulation mode is identical with the target Block Error Rate, so for different encoding rates, formula 1 can draw following relation: Eff
PDCCH_1=2 * Eff
PDCCH_2=4 * Eff
PDCCH_4
Then by according to these 3 PDCCH channel effective spectrum efficiency value Eff
PDCCH_iCan determine 4 effective spectrum efficiency ranges, be respectively:＜Eff
PDCCH_4, Eff
PDCCH_4～Eff
PDCCH_3, Eff
PDCCH_3～Eff
PDCCH_2,＞Eff
PDCCH_1
The interval concrete value of this adjustment can rule of thumb set in advance on eNodeB.
S302: set up the corresponding codes rate for link-quality adjustment interval and adjust mode.
Adjust interval corresponding codes rate for the interval foundation of each above-mentioned adjustment with this and adjust mode.
For example, referring to table 2, adjust interval foundation for each herein and adjust interval corresponding codes rate adjustment mode with this and can be:
Table 2
| Adjust interval | The encoding rate desired value |
| ??Eff PDCCH_i≥Eff PDCCH_1 | ??1 |
| ??Eff PDCCH_2≤Eff PDCCH_i＜Eff PDCCH_1 | ??2 |
| ??Eff PDCCH_4≤Eff PDCCH_i＜Eff PDCCH_2 | ??4 |
| ??Eff PDCCH_i＜Eff PDCCH_4 | ??8 |
Wherein, the encoding rate desired value represents that the CCE with the desired value respective amount carries user's schedule information.
S303:eNodeB obtains CQI (Channel Quality Indication, the channel quality indication) information of current user equipment, and obtains described current user equipment Traffic Channel effective spectrum efficiency value Eff according to described CQI information
ShareCH
After UE (ustomer premises access equipment) sets up wireless connections access LTE system with eNodeB, in down link, eNodeB can configuration UE periodic report CQI information, and this CQI information is used for the channel quality information by following two parameters indication subscriber equipment: the modulating-coding form Q that subscriber equipment can adopt at the downlink business link
mWith modulation system corresponding code rate CodeRate
ShareCHIn the LTE system, the Traffic Channel of subscriber equipment generally includes PDSCH (Physical Downlink Shared Channel, Physical Downlink Shared Channel) and PUSCH (Physical Uplink Shared Channel, Physical Uplink Shared Channel).PDSCH channel and the PUSCH channel modulation system that can adopt usually wherein is such as QPSK, 16QAM or 64QAM etc.CQI information is by modulating-coding form Q
mWith modulation system corresponding code rate CodeRate
ShareCHCombine, 16 kinds of combinations are arranged usually, promptly the span of CQI is generally 0～15.According to the value of CQI, can obtain the modulating-coding form Q that UE adopts by table 3
mCode check CodeRate with the modulation system employing
ShareCH, m=0,1,2 wherein.
Table 3
| ??m | Modulation system | ??Q m |
| ??0 | ??QPSK | ??2 |
| ??1 | ??16QAM | ??4 |
| ??2 | ??64QAM | ??6 |
The Traffic Channel effective spectrum efficient Eff of subscriber equipment
ShareCHThe bit number that the unit modulation symbol can correctly transmit on the expression user apparatus service channel, the modulating-coding form Q of user apparatus service channel employing just
mCode check CodeRate with the modulation system employing
ShareCHProduct with the accuracy of transfer of data promptly can be expressed as formula 4:
Eff
ShareCH=Q
m* CodeRate
ShareCH* (1-IBLER
Target_ShareCH) formula 4
IBLER wherein
Target_ShareCHWhen the modulation coding mode of this CQI correspondence is used in expression, the block error probability desired value that UE transmits first, default value is 0.1 usually.
And for up link, the physical layer of eNodeB can independently be carried out SINR (SignalInterference and noise Ratio, signal to noise ratio) measurement, and measurement result after filtering and other processing, can be obtained corresponding CQI value.Can obtain user apparatus service channel effective spectrum efficiency value Eff based on same computing
ShareCH
S304:eNodeB utilizes the linear value Δ of being determined by link simulation
ShareCH_PDCCHRevise the Traffic Channel effective spectrum efficiency value Eff of described current user equipment
ShareCH, the Traffic Channel effective spectrum efficiency value Eff that obtains revising
ShareCH'.
Because user apparatus service channel and PDCCH channel in the difference of aspects such as coded system, antenna radiation pattern, are introduced the linear value Δ
ShareCH_PDCCHTo user apparatus service channel effective spectrum efficiency value Eff
ShareCHRevise, make the encoding rate adjustment of PDCCH channel more reasonable, wherein the linear value Δ
ShareCH_PDCCHUsually determine by link simulation.
Concrete amending method can be: with user apparatus service channel effective spectrum efficiency value Eff
ShareCHDivided by the linear value Δ
ShareCH_PDCCH, the current user equipment Traffic Channel effective spectrum efficiency value Eff that obtains revising
ShareCH'.
S305:eNodeB determines that according to the radio link quality information of current user equipment the link-quality under the radio link quality of described subscriber equipment adjusts intervally, and the encoding rate of the PDCCH channel that described subscriber equipment is taken according to described link-quality adjustment interval is adjusted.
Still continue to use above-mentioned example this step is described, if the current user equipment Traffic Channel effective spectrum efficiency value Eff that revises
ShareCH' 〉=Eff
PDCCH_1, then according to adjust interval 〉=Eff
PDCCH_1Corresponding encoding rate is adjusted mode, and the encoding rate of PDCCH channel is adjusted, and the encoding rate that is about to the PDCCH channel is adjusted into desired value 1, promptly uses;
In like manner, if Eff
PDCCH_1＞Eff
ShareCH' 〉=Eff
PDCCH_2, then the encoding rate with the PDCCH channel is adjusted into desired value 2, promptly carries user's schedule information with 2 CCE;
If Eff
PDCCH_2＞Eff
ShareCH' 〉=Eff
PDCCH_4, then the encoding rate with the PDCCH channel is adjusted into desired value 4, promptly carries user's schedule information with 4 CCE;
If Eff
ShareCH'＜Eff
PDCCH_4, then the encoding rate with the PDCCH channel is adjusted into desired value 8, promptly carries user's schedule information with 8 CCE.
The channel resource that is used for carrying user data in the LTE system is unified to control and dispatch by eNodeB.For same UE, the user apparatus service channel effective spectrum efficiency value of revising (bit number that the unit modulation symbol can correctly transmit on the user apparatus service channel) can be thought the PDCCH channel effective spectrum efficiency value (bit number that the unit modulation symbol can correctly transmit on the PDCCH channel) that this UE can support.
Here, the size of channel effective spectrum efficient, can reflect link quality information, when user apparatus service channel effective spectrum efficient high more, illustrate that then subscriber equipment is near more from the distance of eNodeB, such as center of housing estate, its link-quality is good more, can select high more encoding rate this moment, promptly carry the control information of UE with less CCE, so not only can improve the control efficiency of resource, and can promote the number of users of dispatching simultaneously in the same TTI, reduce the wait time delay of user data; Otherwise, when user apparatus service channel effective spectrum efficient low more, illustrate that then subscriber equipment is far away more from the distance of eNodeB, such as cell edge, this moment, link-quality was poor more, and can select lower encoding rate this moment, promptly carries the control information of UE with more CCE, improve the transmission quality of control channel like this, satisfy the requirement that control channel covers.
As seen, the PDCCH channel encoding rate regulation method that the embodiment of the invention provides, current user equipment Traffic Channel effective spectrum efficiency value according to the subscriber equipment that obtains, determine the affiliated link-quality adjustment interval of radio link quality of this subscriber equipment, the encoding rate of the PDCCH channel that this subscriber equipment is taken according to described link-quality adjustment interval is adjusted, thereby realize actual state according to the current user equipment link-quality, the encoding rate of choose reasonable PDCCH channel, and then improve the control efficiency of resource.
Concrete beneficial effect can show as, improved the efficient of PDCCH channel, that is to say, improved same TTI (Transmit Time Interval to user's transmitting scheduling information, the number of users of dispatching simultaneously Transmission Time Interval) reduces the wait time delay of user data at transmitter side.
Because the embodiment of the invention to the thought of PDCCH channel encoding rate adjustment is, adjust the encoding rate of PDCCH channel according to the link quality condition self adaptation of current user equipment, when link-quality is good more, then select high more encoding rate, the control information of promptly carrying UE with less CCE; Poor more when link-quality, then select low more encoding rate, the control information of promptly carrying UE with more CCE.When user apparatus service channel effective spectrum efficient is high more, link-quality is good more, by top formula 4 as can be known, user apparatus service channel effective spectrum efficient depends primarily on the modulation system that the user apparatus service channel is adopted, therefore a simple realization scheme as the embodiment of the invention can be, if the user apparatus service channel adopts the 64QAM modulation system, then the PDCCH channel adopts 1 CCE carrying UE schedule information; If the user apparatus service channel adopts the 16QAM modulation system, then the PDCCH channel adopts 2 CCE carrying UE schedule informations; When if the user apparatus service channel adopts the QPSK modulation system, then the PDCCH channel adopts 4 or 8 CCE carrying UE schedule informations.
In the PDCCH channel encoding rate regulation method that the embodiment of the invention provides, the subscriber equipment radio link quality information that eNodeB obtains, can be not limited only to subscriber equipment path loss, or only limit to user apparatus service channel effective spectrum efficient, can also obtain the multiple relevant parameter that can embody the subscriber equipment radio link quality simultaneously, such as obtaining subscriber equipment path loss and user apparatus service channel effective spectrum efficient etc. simultaneously, can be provided with according to concrete needs.That is to say that the described method of above-mentioned Fig. 2, Fig. 3 can be used simultaneously, the embodiment of the invention does not limit.
Referring to Fig. 4, the embodiment of the invention also provides a kind of PDCCH channel encoding rate regulation method, comprising:
S401: set link-quality and adjust interval.
Setting the interval that the current radio link quality information of obtaining is better than historical radio link quality information is that up adjustment is interval; Setting the interval that the current radio link quality information of obtaining is inferior to historical radio link quality information is that descending adjustment is interval.
Wherein historical radio link quality information can be the radio link quality information of obtaining last time, then is better than historical radio link quality information and is the current radio link quality information of obtaining and be better than the radio link quality information obtained last time;
Historical radio link quality information also can be the radio link quality information of obtaining several times on continuously, then be better than historical radio link quality information and can be understood as the current radio link quality information of obtaining and continue the radio link quality information that is better than obtaining several times, that is to say that the link-quality situation continues situation about optimizing.
Choose continuously in this adjustment interval and can rule of thumb be set in advance on the eNodeB as historical radio link quality information several times.
S402: set up the corresponding codes rate for link-quality adjustment interval and adjust mode.
Adjust interval corresponding codes rate for the interval foundation of each above-mentioned adjustment with this and adjust mode.Be specially: with described up adjustment interval corresponding codes rate adjustment mode be: raise the encoding rate that described PDCCH channel should adopt; With described descending adjustment interval corresponding codes rate adjustment mode be: reduce the encoding rate that described PDCCH channel should adopt.
For example, referring to table 4:
Table 4
| Adjust interval | Encoding rate is adjusted mode |
| Up adjustment is interval | Raise the encoding rate that described PDCCH channel should adopt |
| Descending adjustment is interval | Reduce the encoding rate that described PDCCH channel should adopt |
Wherein, radio link quality information of user equipment can be path loss values or user apparatus service channel effective spectrum efficiency value etc.
S403:eNodeB obtains the radio link quality information of current user equipment.
Wherein, the radio link quality information of described current user equipment is the relevant parameter that is used to embody the current user equipment link-quality, such as subscriber equipment path loss or user apparatus service channel effective spectrum efficient etc.
S404:eNodeB determines that according to the radio link quality information of current user equipment the link-quality under the radio link quality of described subscriber equipment adjusts intervally, and the encoding rate of the PDCCH channel that described subscriber equipment is taken according to described link-quality adjustment interval is adjusted.
Wherein, determine that according to described radio link quality information the link-quality adjustment interval under the radio link quality of described subscriber equipment can be:
When described radio link quality information is better than historical radio link quality information, the radio link quality of determining described subscriber equipment belongs to up adjustment interval, perhaps when described radio link quality information is inferior to historical radio link quality information, determine that the radio link quality of described subscriber equipment belongs to descending adjustment interval;
Then, the encoding rate adjustment of the PDCCH channel that described subscriber equipment is taken according to described link-quality adjustment interval can be:
When described link-quality adjustment interval is up adjustment interval, raise the PDCCH channel encoding rate that described subscriber equipment takies; Perhaps when described link-quality adjustment interval is descending adjustment interval, reduce the PDCCH channel encoding rate that described subscriber equipment takies.
Such as, in data transmission procedure, if eNodeB detects current user equipment Traffic Channel spectral efficiency values and continues to increase (with respect to the last transmission frequency spectra efficiency value), and continuous N time user data block transmission is correct, the encoding rate that then raises the PDCCH channel is original 2 times, until reaching maximum encoding rate (such as adopting 1 CCE to carry this user's schedule information);
Continue to descend if eNodeB detects current user equipment Traffic Channel spectrum efficiency, and one of following situation occurs: 1. eNodeB sends after the data on PDCCH channel and PDSCH channel, determines that subframe does not receive the ACK/NACK reporting information; 2. eNodeB sends after the data on the PDCCH channel, determines that subframe does not receive the upstream data that UE sends, and the encoding rate of then reducing the PDCCH channel is original 1/2; If this phenomenon continues to occur, after then the encoding rate of PDCCH channel is adjusted into the minimum code rate, stop to adjust.
For another example, in data transmission procedure, if detecting the path loss persistent value of current user equipment, eNodeB continues to reduce (with respect to the path loss values of the last time transmission), and continuous N time user data block transmission is correct, the encoding rate that then raises the PDCCH channel is original 2 times, until reaching maximum encoding rate (such as adopting 1 CCE to carry this user's schedule information);
Continue to increase if eNodeB detects the path loss values of current user equipment, and one of following situation occurs: 1. eNodeB sends after the data on PDCCH channel and PDSCH channel, determines that subframe does not receive the ACK/NACK reporting information; 2. eNodeB sends after the data on the PDCCH channel, determines that subframe does not receive the upstream data that UE sends, and the encoding rate of then reducing the PDCCH channel is former 1/2; If this phenomenon continues to occur, after then the encoding rate of PDCCH channel is adjusted into the minimum code rate, stop to adjust.
As seen, the PDCCH channel encoding rate regulation method that the embodiment of the invention provides, according to the radio link quality information of user equipment of obtaining, determine the affiliated link-quality adjustment interval of radio link quality of this subscriber equipment, the encoding rate of the PDCCH channel that this subscriber equipment is taken according to described link-quality adjustment interval is adjusted, thereby realize actual state according to the current user equipment link-quality, the encoding rate of choose reasonable PDCCH channel, and then improve the control efficiency of resource.
Concrete beneficial effect can show as, improved the efficient of PDCCH channel, that is to say, improved same TTI (Transmit Time Interval to user's transmitting scheduling information, the number of users of dispatching simultaneously Transmission Time Interval) reduces the wait time delay of user data at transmitter side.
Referring to Fig. 5, the embodiment of the invention provides a kind of evolution base station eNodeB, comprising:
Acquisition module 501 is used to obtain radio link quality information of user equipment.
Wherein, described radio link quality information of user equipment is the relevant parameter that is used to embody the current user equipment link-quality, such as subscriber equipment path loss or user apparatus service channel effective spectrum efficient etc.
Adjusting module 502, be used for determining that according to the radio link quality information that described acquisition module 501 obtains link-quality under the radio link quality of described subscriber equipment adjusts intervally, the encoding rate of the PDCCH channel that described subscriber equipment is taken according to described link-quality adjustment interval is adjusted.
As seen, the evolution base station eNodeB that the embodiment of the invention provides, according to the radio link quality information of user equipment of obtaining, determine the affiliated link-quality adjustment interval of radio link quality of this subscriber equipment, the encoding rate of the PDCCH channel that this subscriber equipment is taken according to described link-quality adjustment interval is adjusted, thereby realize actual state according to the current user equipment link-quality, the encoding rate of choose reasonable PDCCH channel, and then improve the control efficiency of resource.
Concrete beneficial effect can show as, improved the efficient of PDCCH channel, that is to say, improved same TTI (Transmit Time Interval to user's transmitting scheduling information, the number of users of dispatching simultaneously Transmission Time Interval) reduces the wait time delay of user data at transmitter side.
Referring to Fig. 6, in one embodiment of the invention, described adjusting module 502 comprises:
Interval determining unit 601, be used to judge the residing interval of determining by predetermined threshold value of radio link quality information that described acquisition module 501 obtains, determine that the link-quality under the radio link quality of described subscriber equipment is adjusted the interval described interval that is;
Adjustment unit 602, the encoding rate that is used for PDCCH channel that described subscriber equipment is taken are adjusted into the link-qualities that described interval determining unit 601 determines and adjust interval corresponding desired value.
Referring to Fig. 7, in another embodiment of the present invention, described adjusting module 502 comprises:
Interval determining unit 701, be used for when radio link quality information that described acquisition module 501 obtains is better than historical radio link quality information, the radio link quality of determining described subscriber equipment belongs to up adjustment interval, when perhaps the radio link quality information of obtaining when described acquisition module 501 is inferior to historical radio link quality information, determine that the radio link quality of described subscriber equipment belongs to descending adjustment interval;
Adjustment unit 702 is used for raising the PDCCH channel encoding rate that described subscriber equipment takies when described interval determining unit 701 determines that the radio link quality of described subscriber equipment belongs to up adjustment interval; Perhaps when described interval determining unit 701 determines that the radio link quality of described subscriber equipment belongs to up adjustment interval, reduce the PDCCH channel encoding rate that described subscriber equipment takies.
In one embodiment of the invention, referring to Fig. 8, described acquisition module 501 comprises:
PHR information acquisition unit 801 is used to obtain the through-put power surplus PHR information that current user equipment reports;
Path loss acquiring unit 802 is used for obtaining according to described PHR information the path loss values of current user equipment.
Owing to be used for the channel resource of carrying user data in the LTE system is to unify control and scheduling by eNodeB.So for same UE, this UE is identical with the loss of PDCCH channel path with this user's of eNodeB determining positions user apparatus service channel path loss.
Here, the size of information on path loss, can reflect the user equipment link quality information, PL is more little when subscriber equipment information on path loss value, illustrate that then subscriber equipment is near more from the distance of eNodeB, such as center of housing estate, its user equipment link quality is good more, can select high more encoding rate this moment, promptly carry user's control information with less CCE, so not only can improve the control efficiency of resource, and can promote the number of users of dispatching simultaneously in the same TTI, reduce the wait time delay of user data; Otherwise, PL is big more when subscriber equipment information on path loss value, illustrate that then subscriber equipment is far away more from the distance of eNodeB, such as cell edge, its user equipment link quality is poor more, and can select lower encoding rate this moment, promptly carries user's control information with more CCE, improve the transmission quality of control channel like this, satisfy the requirement that control channel covers.
In another embodiment of the present invention, referring to Fig. 9, described acquisition module 501 comprises:
CQI information acquisition unit 901 is used to obtain the channel quality indicator (CQI) information of current user equipment.
Effective spectrum efficient acquiring unit 902 is used for obtaining according to described CQI information the Traffic Channel effective spectrum efficiency value of described current user equipment.
Amending unit 903 is used to utilize the Traffic Channel effective spectrum efficiency value by the definite described current user equipment of linear value correction of link simulation, the Traffic Channel effective spectrum efficiency value that obtains revising.
Because user apparatus service channel and PDCCH channel in the difference of aspects such as coded system, antenna radiation pattern, are introduced the linear value Δ
ShareCH_PDCCHTo user apparatus service channel effective spectrum efficiency value Eff
ShareCHRevise, make the encoding rate adjustment of PDCCH channel more reasonable, wherein the linear value Δ
ShareCH_PDCCHUsually determine by link simulation.Concrete amending method can be: with user apparatus service channel effective spectrum efficiency value Eff
ShareCHDivided by the linear value Δ
ShareCH_PDCCH, the current user equipment Traffic Channel effective spectrum efficiency value Eff that obtains revising
ShareCH'.
The channel resource that is used for carrying user data in the LTE system is unified to control and dispatch by eNodeB.For same UE, the user apparatus service channel effective spectrum efficiency value of revising (bit number that the unit modulation symbol can correctly transmit on the user apparatus service channel) can be thought the PDCCH channel effective spectrum efficiency value (bit number that the unit modulation symbol can correctly transmit on the PDCCH channel) that this subscriber equipment can be supported.
Here, the size of channel effective spectrum efficient, can reflect link quality information, when user apparatus service channel effective spectrum efficient high more, illustrate that then subscriber equipment is near more from the distance of eNodeB, such as center of housing estate, its link-quality is good more, can select high more encoding rate this moment, promptly carry user's control information with less CCE, so not only can improve the control efficiency of resource, and can promote the number of users of dispatching simultaneously in the same TTI, reduce the wait time delay of user data; Otherwise, when user apparatus service channel effective spectrum efficient low more, illustrate that then subscriber equipment is far away more from the distance of eNodeB, such as cell edge, this moment, link-quality was poor more, and can select lower encoding rate this moment, promptly carries user's control information with more CCE, improve the transmission quality of control channel like this, satisfy the requirement that control channel covers.
Need to prove, in this article, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thereby make and comprise that process, method, article or the equipment of a series of key elements not only comprise those key elements, but also comprise other key elements of clearly not listing, or also be included as this process, method, article or equipment intrinsic key element.Do not having under the situation of more restrictions, the key element that limits by statement " comprising ... ", and be not precluded within process, method, article or the equipment that comprises described key element and also have other identical element.
One of ordinary skill in the art will appreciate that, realize that all or part of step in the foregoing description method is to instruct relevant hardware to finish by program, described program can be stored in the computer read/write memory medium, this program comprises that some instructions are in order to carry out the described method of each embodiment of the present invention when carrying out.Storage medium described here, as: ROM/RAM, magnetic disc, CD etc.
The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.All any modifications of being done within the spirit and principles in the present invention, be equal to replacement, improvement etc., all be included in protection scope of the present invention.
Claims (10)
1, a kind of downlink physical control channel PDCCH channel encoding rate regulation method is characterized in that described method comprises:
Obtain radio link quality information of user equipment;
Determine that according to described radio link quality information link-quality under the radio link quality of described subscriber equipment adjusts intervally, the encoding rate of the PDCCH channel that described subscriber equipment is taken according to described link-quality adjustment interval is adjusted.
2, method according to claim 1 is characterized in that, described radio link quality information is a path loss values, then describedly obtains radio link quality information of user equipment and comprises:
Obtain the through-put power surplus PHR information of described user equipment to report;
Obtain the path loss values of described subscriber equipment according to described PHR information.
3, method according to claim 1 is characterized in that, described radio link quality information is a user apparatus service channel effective spectrum efficiency value, then describedly obtains radio link quality information of user equipment and comprises:
Obtain the channel quality indicator (CQI) information of described subscriber equipment;
Obtain the effective spectrum efficiency value of the Traffic Channel of described subscriber equipment according to described CQI information;
Utilization is by the effective spectrum efficiency value of the Traffic Channel of the definite described subscriber equipment of linear value correction of link simulation, the Traffic Channel effective spectrum efficiency value that obtains revising.
According to each described method of claim 1-3, it is characterized in that 4, the encoding rate adjustment of the described PDCCH channel that described subscriber equipment is taken according to described link-quality adjustment interval comprises:
The encoding rate of the PDCCH channel that described subscriber equipment is taken is adjusted into described link-quality and adjusts interval corresponding desired value.
According to each described method of claim 1-3, it is characterized in that 5, the link-quality under the described radio link quality of determining described subscriber equipment according to described radio link quality information is adjusted interval, comprising:
When described radio link quality information is better than historical radio link quality information, determine that the radio link quality of described subscriber equipment belongs to up adjustment interval, perhaps
When described radio link quality information is inferior to historical radio link quality information, determine that the radio link quality of described subscriber equipment belongs to descending adjustment interval;
The encoding rate of the described PDCCH channel that described subscriber equipment is taken according to described link-quality adjustment interval is adjusted, and comprising:
When described link-quality adjustment interval is up adjustment interval, raise the PDCCH channel encoding rate that described subscriber equipment takies, perhaps,
When described link-quality adjustment interval is descending adjustment interval, reduce the PDCCH channel encoding rate that described subscriber equipment takies.
6, a kind of evolution base station eNodeB is characterized in that, comprising:
Acquisition module is used to obtain radio link quality information of user equipment;
Adjusting module, be used for determining that according to the radio link quality information that described acquisition module obtains link-quality under the radio link quality of described subscriber equipment adjusts intervally, the encoding rate of the PDCCH channel that described subscriber equipment is taken according to described link-quality adjustment interval is adjusted.
7, evolution base station eNodeB according to claim 6 is characterized in that, described acquisition module comprises:
The PHR information acquisition unit is used to obtain the through-put power surplus PHR information of described user equipment to report;
The path loss acquiring unit is used for obtaining according to described PHR information the path loss values of described subscriber equipment.
8, evolution base station eNodeB according to claim 6 is characterized in that, described acquisition module comprises:
The CQI information acquisition unit is used to obtain the channel quality indicator (CQI) information of described subscriber equipment;
Effective spectrum efficient acquiring unit is used for obtaining according to described CQI information the effective spectrum efficiency value of the Traffic Channel of described subscriber equipment;
Amending unit is used to utilize the Traffic Channel effective spectrum efficiency value by the definite described subscriber equipment of linear value correction of link simulation, the Traffic Channel effective spectrum efficiency value that obtains revising.
9, according to each described evolution base station eNodeB of claim 6-8, it is characterized in that described adjusting module comprises:
Interval determining unit is used for determining that according to described radio link quality information the link-quality under the radio link quality of described subscriber equipment adjusts interval;
Adjustment unit, the encoding rate that is used for PDCCH channel that described subscriber equipment is taken are adjusted into the link-quality that described interval determining unit determines and adjust interval corresponding desired value.
10, according to each described evolution base station eNodeB of claim 6-8, it is characterized in that described adjusting module comprises:
Interval determining unit, be used for when described radio link quality information is better than historical radio link quality information, the radio link quality of determining described subscriber equipment belongs to up adjustment interval, perhaps when described radio link quality information is inferior to historical radio link quality information, determine that the radio link quality of described subscriber equipment belongs to descending adjustment interval;
Adjustment unit is used for raising the PDCCH channel encoding rate that described subscriber equipment takies when described interval determining unit determines that the radio link quality of described subscriber equipment belongs to up adjustment interval; Perhaps, when described interval determining unit determines that the radio link quality of described subscriber equipment belongs to descending adjustment interval, reduce the PDCCH channel encoding rate that described subscriber equipment takies.
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