CN102196548B - Dynamic control method of channel coding gain - Google Patents
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Abstract
The invention discloses a dynamic control method of channel coding gain. The method comprises the steps of setting multiple optional channel coding rates corresponding to various numbers of code channels occupied by a user in advance; setting an accelerating threshold and a deceleration threshold for each optional channel coding rate under the corresponding code channel number; monitoring a target SIR (Signal Interference Ratio) of the user while the channel coding gain control is carried out; if the target SIR of the access user is always lower than the accelerating threshold of the current channel coding rate within a certain time, keeping the number of the occupied code channels invariable and increasing the channel coding rate so as to reduce the coding gain, increase the code resource utilization rate and provide a larger user bandwidth as much as possible under the precondition of assuring that the access user number is invariable; and if the target SIR of the access user is always higher than the decelerating threshold of the current channel coding rate within a certain time, keeping the number of the occupied code channels invariable and reducing the channel coding rate so as to assure the receiving performance of the user data.
Description
Technical field
The present invention relates to data communication technology, particularly a kind of dynamic control method of channel coding gain.
Background technology
Along with the development of the communication technology, the use of data service is more and more extensive.In a kind of networking plan of current TD-SCDMA system, adopt the up-downgoing time slot proportion of 2: 4, in each subframe, up retains two time slots, and it is upper that upstream data is carried on DCH, and therefore up total bandwidth is very limited.Due to a plurality of users' data sharing DCH channel, therefore up total bandwidth directly affects the quantity of access user and each user's impression simultaneously.
And, in the situation that total bandwidth is limited, if consider, improve user's impression, and increase the bandwidth of distributing to each user, will inevitably reduce access customer number; If consider, increase actual access customer number, the bandwidth of each user assignment is inevitable limited, can reduce user's impression.Visible, in the situation that total bandwidth is limited, there is certain contradiction in user's impression with actual access customer number.
Summary of the invention
In view of this, the invention provides a kind of dynamic control method of channel coding gain, can utilize identical code resource that larger user bandwidth is provided as far as possible, thereby under the prerequisite that guarantees actual access customer number, improve user's use impression as far as possible.
For achieving the above object, the present invention adopts following technical scheme:
A kind of dynamic control method of channel coding gain, the various code channel numbers that take of respective user in advance, the channel coding rate of plurality of optional is set, and is every kind of optional channel coding rate, be arranged on corresponding code channel number raising speed thresholding and the reduction of speed thresholding of this channel coding rate now; When arbitrary access user was carried out to the control of channel coding gain, the method comprised:
Determine code channel number and current channel coding rate that described access user takies, and the target signal interference ratio SIR of described access user is monitored;
If the target SIR of described access user takies lower than this access user in the first Preset Time code channel number is the raising speed thresholding of current channel coding rate now always, the code channel invariable number that keeps this CU, the channel coding rate of this access user that raises;
If the target SIR of described access user takies higher than this access user in the second Preset Time code channel number is the reduction of speed thresholding of current channel coding rate now always, the code channel invariable number that keeps this CU, reduce the channel coding rate of this access user.
Preferably, described arrange corresponding code channel number now raising speed thresholding and the reduction of speed thresholding of this channel coding rate be: under described code channel number and described channel coding rate, target SIR under disturbance is carried out to emulation, determine described raising speed thresholding and reduction of speed thresholding according to simulation result.
Preferably, at arbitrary code channel number now, by the punching limit, parameters of rate matching and transformat combination, various described channel coding rate are set.
Preferably, the channel coding rate of described this access user of rising is: the code channel number taken at described access user now, from various optional channel coding rate, selecting a kind of higher than current channel coding rate, the channel coding rate of selection is configured to described access user.
Preferably, describedly from various optional channel coding rate, selecting higher than a kind of of current channel coding rate, be: from various optional channel coding rate, the highest and a kind of higher than current channel coding rate of selective channel code rate, perhaps, from minimum a kind of of selective channel code rate the various optional channel coding rate higher than current channel coding rate.
Preferably, the channel coding rate of described this access user of reduction is: the code channel number taken at described access user now, from various optional channel coding rate, selecting a kind of lower than current channel coding rate, the channel coding rate of selection is configured to described access user.
Preferably, describedly from various optional channel coding rate, selecting lower than a kind of of current channel coding rate, be: from various optional channel coding rate, minimum and a kind of lower than current channel coding rate of selective channel code rate, perhaps, from the highest a kind of of selective channel code rate the various optional channel coding rate lower than current channel coding rate.
Preferably, reshuffle RB RECFG message or TFC Control by radio bearer, the channel coding rate of selection is configured to described access user.
As seen from the above technical solution, in the present invention, the various code channel numbers that take of respective user in advance, arrange the channel coding rate of plurality of optional, and be every kind of optional channel coding rate, be arranged on corresponding code channel number raising speed thresholding and the reduction of speed thresholding of this channel coding rate now; When carrying out channel coding gain control, the target SIR of monitor user ', if the target SIR of access user is within a certain period of time all the time lower than the raising speed thresholding of current channel coding rate, keep the code channel invariable number taken, the rising channel coding rate, thereby the reduction coding gain, improve a code resource utilization, guaranteeing provides larger user bandwidth under prerequisite that access customer number is constant as far as possible.If the target SIR of access user all the time higher than the reduction of speed thresholding of current channel coding rate, keeps the code channel invariable number taken within a certain period of time, reduce channel coding rate, thereby guarantee the receptivity of user data.
The accompanying drawing explanation
Fig. 1 is the particular flow sheet of channel coding gain dynamic control method in the embodiment of the present invention.
Fig. 2 a is that 8VRU lower channel code rate is the target SIR simulation result schematic diagram of 64k.
Fig. 2 b is that 8VRU lower channel code rate is the target SIR simulation result schematic diagram of 80k.
Fig. 2 c is that 8VRU lower channel code rate is the target SIR simulation result schematic diagram of 88k.
Fig. 2 d is that 8VRU lower channel code rate is the target SIR simulation result schematic diagram of 96k.
Fig. 3 is the mean value schematic diagram of target SIR under 8VRU different channels code rate.
Embodiment
For making purpose of the present invention, technological means and advantage clearer, below in conjunction with accompanying drawing, the present invention is described in further details.
When carrying out transmitting uplink data, need to carry out the chnnel coding processing to data, in the user profile data that send, add redundant data, to adapt to the demand of wireless transmission.The data of processing through chnnel coding possess certain coding gain, and usually, coding gain is higher, and the receptivity of data is better, but larger in requisition for the redundant data amount sent, channel coding rate is lower, and user bandwidth is less.Wherein, channel coding rate refers in the actual bandwidth that the user is assigned with, and removes transmission rates redundant data, the user profile data.Visible, coding gain and channel coding rate have reflected from different perspectives, the relation after the chnnel coding processing between redundant data and user profile data, and it is large that coding gain becomes, and channel coding rate diminishes, and coding gain diminishes, and channel coding rate becomes greatly.
In existing transmitting uplink data, the processing mode that chnnel coding is relevant is all changeless, and therefore, the coding gain obtained and channel coding rate are all also identical, are also identical thereby the user bandwidth provided on the same code resource is provided.
Based on the impact of aforesaid different coding gain on user bandwidth, the present invention considers under the prerequisite that guarantees the data receiver performance, coding gain in transfer of data is adjusted, namely channel coding rate is adjusted, thereby under the prerequisite of CU same code resource, increase channel coding rate as far as possible, improve user bandwidth.
Further, the quality of link-quality can affect the data receiver performance, when link-quality is better, and user's data receiver better performances, now, the coding gain of transfer of data can not need too high; When link-quality is poor, user's data receiver poor-performing, now, the coding gain of transfer of data should reach certain numerical value, to guarantee user's data receiver performance.
Based on this, basic thought of the present invention is: according to the quality of link-quality, the DCH business is carried out to the dynamic control of coding gain.Link-quality better, lower, the disturbed condition of UE transmitting power in situation, suitably reduces the coding gain of DCH business preferably, to reduce the bit number of actual needs transmission, improves channel coding rate and a code resource utilization.Poor at link-quality, the UE transmitting power is higher, disturbs in larger situation, and coding gain is improved, and reduces channel coding rate, to guarantee the data receiver performance.
Wherein, the judgement for the link-quality quality is to determine according to the target signal interference ratio in uplink power control (SIR).When the target SIR value is low, show that link-quality is better, only need to reach lower sir value, namely can realize the target receptivity of user data, the transmitting power of corresponding UE is also lower; When the target SIR value is higher, show that link-quality is poor, need to reach certain sir value, can realize the target receptivity of user data, the transmitting power of corresponding UE is also higher.
Next, by specific embodiment, specific implementation of the present invention is described.
Fig. 1 is the particular flow sheet of channel coding gain dynamic control method in the embodiment of the present invention.As shown in Figure 1, the method comprises:
Step 101, the various code channel numbers that take of respective user, arrange the channel coding rate of plurality of optional, and be every kind of optional channel coding rate in advance, is arranged on corresponding code channel number raising speed thresholding and the reduction of speed thresholding of this channel coding rate now.
In communication system, the user is carrying out transfer of data on the code channel of its distribution.In the HSDPA system, the code channel number of distributing to the user is generally fixing several selections, for example 4VRU, 8VRU and 16VRU.In existing system, corresponding different code channel numbers, the configuration meeting of channel coding rate is different usually, but for same code channel number, as previously mentioned, for user configured channel coding rate is changeless.
In the present invention, corresponding every kind of code channel number, set in advance the channel coding rate of plurality of optional, thereby can be in the coding gain control method, for the user configures different channel coding rate, obtain different coding gains as required, to realize the purpose of dynamic control coding gain.
Wherein, the parameter that affects coding gain and channel coding rate comprises: the punching limit, parameters of rate matching and transformat combination.Wherein, the punching limit is in case definite, and corresponding parameters of rate matching is namely determined.Therefore, for reaching different coding gain and channel coding rate, usually can realize by the punch limit and/or transformat combination of adjustment.
Particularly, when various optional channel coding rate was set, the setting by the corresponding punching limit, parameters of rate matching and transformat combination, realized corresponding channel coding rate.In other words, corresponding every kind of optional channel coding rate, preserve corresponding parameter, the limit of namely punching, parameters of rate matching and transformat combination, as long as according to this group parameter configuration, UE just can realize corresponding channel coding rate.For example, under 8VRU, for realizing the chnnel coding code rate of 64k, corresponding canonical parameter is configured to: the punching limit is pl=14, and parameters of rate matching is 160, TTI=20ms, and transformat combination is { TBNUMBER=0, TBSIZE=336;
TBNUMBER＝1，TBSIZE＝336；
TBNUMBER＝2，TBSIZE＝336；
TBNUMBER＝3，TBSIZE＝336；
TBNUMBER＝4，TBSIZE＝336；}
Wherein, same channel coding rate also may correspondingly be organized parameters more, and expression can realize by different parameter combinations this channel coding rate.Specifically can be by the simple change punching limit, change transformat combination merely or change simultaneously the punching limit and transformat combination, realize corresponding channel coding rate.
After various channel coding rate were set, corresponding every kind of channel coding rate, arranged corresponding code channel number raising speed thresholding and the reduction of speed thresholding of this channel coding rate now.
As previously mentioned, in the present invention, the target SIR of take is standard judgement link-quality quality, thereby determines whether to carry out the variation of channel coding rate.Wherein, for channel coding rate of the same race, not considering that under the prerequisite of disturbing, target SIR is relatively stable, be always maintained at certain numerical value upper and lower; For the different channels code rate, the numerical value that target SIR maintains is different, and wherein, along with the increase of channel coding rate, the target SIR statistical value rises thereupon.As shown in Figure 2 a-2d.
Characteristics based on above-mentioned target SIR are visible, and for different channel coding rate, under the same link quality, the statistical value of target SIR can be different.Simultaneously, for the different code channel numbers that the user occupies, under the same channel code rate, the level of target SIR also can be different.Therefore, the present invention, according to the current link-quality of target SIR judgement the time, need to, according to different channel coding rate and corresponding CU code channel number, arrange different quality judgement thresholding, i.e. raising speed thresholding and reduction of speed thresholding.
Particularly, for any code channel number, for various optional channel coding rate arrange this code channel number raising speed thresholding and reduction of speed thresholding now.Wherein, the mode that raising speed thresholding and reduction of speed thresholding are set is: under corresponding code channel number and channel coding rate, the target SIR under disturbance is carried out to emulation, determine raising speed thresholding and reduction of speed thresholding according to simulation result.Example as shown in Figure 2 a-2d, has provided under 8VRU, and channel coding rate is 64k, 80k, 88k, the target SIR simulation result schematic diagram of 96k.The wherein mean value of target SIR such as following table and shown in Figure 3 under the 8VRU different rates.
| Speed | SirTarget Aver |
| 96K | 11.5461 |
| 88K | 10.8625 |
| 80K | 10.388 |
| 64K | 8.3673 |
Table 1
For the target SIR value, in noiseless (link-quality the best) situation, target SIR maintains certain numerical value left and right, and along with the increase (being link-quality variation gradually) of disturbing, UE power constantly increases, target SIR also increases thereupon, because UE power can only change within the specific limits, after UE power is lifted to maximum, continue to increase even disturb, target SIR also no longer raises, and will cause network to become very poor for the receptivity of UE upstream data.
Variation Features based on target SIR under above-mentioned different link-qualities, according to the simulation result shown in Fig. 2 a-2d, determine raising speed thresholding and reduction of speed thresholding, wherein, the raising speed thresholding is target SIR value corresponding under the better state of link-quality, the statistical minimum value of target SIR in simulation result namely, during lower than this raising speed thresholding, show that link-quality is better when target SIR, the receptivity of upstream data is better, can improve channel coding rate; Target SIR value when the reduction of speed thresholding is about to top out for interference target SIR large, emulation, the statistical maximum of target SIR in simulation result namely, when target SIR during higher than this reduction of speed thresholding, show that link-quality is poor, for guaranteeing the receptivity of upstream data, should reduce channel coding rate, improve coding gain.
Specifically under different simulation results, those skilled in the art all can determine concrete raising speed and reduction of speed thresholding according to mentioned above principle, just repeat no more here.
After above-mentioned the setting, a multistage corresponding relation will be formed, at first preserve a plurality of different code channel numbers, corresponding every kind of code channel number is preserved the code rate of plurality of optional, wherein, every kind of corresponding corresponding parameter of code rate (the punching limit, parameters of rate matching and transformat combination) and raising speed, reduction of speed thresholding.Specifically can record by forms mode as follows:
| The code channel number | Channel coding rate | Relevant parameter | The raising speed thresholding | The reduction of |
| 8VRU | ||||
| 64K | The |
SIR1 | SIR2 |
Table 2
In upper table, corresponding every kind of channel coding rate, provide one group of corresponding parameter, specifically passes through the different channels code rate of the change realization of the punching limit.Certainly, also can adjust channel coding rate by transformat combination, those skilled in the art can arrange according to the content of prior art, just repeat no more here.
Step 102, determine code channel number and current channel coding rate that access user takies, and the target SIR of access user monitored.
When access user application method of the present invention is carried out to coding gain control, at first determine code channel number and the current channel coding rate that this access user takies, after definite code channel number and current channel coding rate, according to configuration in step 101 and the multistage corresponding relation preserved, can access at corresponding code channel number raising speed thresholding and the reduction of speed thresholding of this channel coding rate now.
Simultaneously, the target SIR of monitoring access user.Wherein, target SIR is the variable arranged in power control process, to the monitoring of target SIR, and the process exactly the current goal SIR in the power control control procedure extracted.
Step 103, judge whether the target SIR of access user meets raising speed condition and reduction of speed condition, if meet the raising speed condition, perform step 104, if meet the reduction of speed condition, perform step 105, if raising speed condition and reduction of speed condition all do not meet, perform step 106, maintain current channel coding rate.
This step judges whether the target SIR of access user meets raising speed condition and reduction of speed condition.As previously mentioned, raising speed thresholding and the reduction of speed thresholding of channel coding rate is set, if target SIR, lower than this raising speed thresholding, shows that current link-quality is better, can improves channel coding rate, so that larger user bandwidth to be provided; If target SIR, higher than this reduction of speed thresholding, shows that current link-quality is poor, for guaranteeing the data receiver performance, need to reduce channel coding rate.
But consider that the link-quality of determining according to target SIR should be a stable result, rather than transient results, so while in the present invention, setting raising speed condition and reduction of speed condition, require will maintain the regular hour lower than the raising speed thresholding with higher than the raising speed thresholding.
Concrete raising speed condition is: the target SIR of access user is all the time lower than the raising speed thresholding in the first system Preset Time.The reduction of speed condition is: the target SIR of access user is all the time higher than the reduction of speed thresholding in the second system Preset Time.Wherein, the first system Preset Time and second system Preset Time require definite according to the stability of a system, and those skilled in the art can set as required, just no longer describe in detail here.
Step 104, the code channel invariable number that keeps access user to take, the channel coding rate of this access user that raises, and return to step 102.
While in this step, carrying out the raising speed of channel coding rate, the code channel invariable number that keeps access user to take.Particularly, the code channel number taken at access user now, according in the corresponding code channel number various optional channel coding rate now arranged in step 101, selection is a kind of higher than current channel coding rate, then the channel coding rate of selection is configured to access user.
Wherein, while selecting a kind of optional channel coding rate higher than current channel coding rate, in the various optional channel coding rate that can arrange in step 101, adopt the mode of rising step by step or select the mode of disposable rising.
Particularly, in the mode raise step by step, namely, in optional channel coding rate, select the minimum channel coding rate higher than current channel coding rate, thereby realize the steady lifting of channel coding rate; In the mode of disposable rising, namely, in optional channel coding rate, select the highest channel coding rate, disposable code rate is risen to the highest, to promote to greatest extent user bandwidth.For example, under the setting of table 1, suppose that under 8VRU, current channel coding rate is 64k, when this step is selected, if according to the mode that raises step by step, select the channel coding rate of 80k to configure to access user; If according to disposable rising mode, select the channel coding rate of 96k to configure to access user.
When the channel coding rate by selection configures to access user, be about to one group of parameter configuration corresponding to this channel coding rate to access user, specifically can reshuffle RB RECFG message or TFC Control carries out the design parameter configuration by radio bearer, certainly also be not limited to above-mentioned configuration mode.Access user carries out the chnnel coding processing according to the relevant parameter (comprising the punching limit, parameters of rate matching and transformat combination) of configuration, namely can realize corresponding channel coding rate.Wherein, when the channel coding rate correspondence is organized relevant parameter, can select arbitrarily one group of parameter to be configured more, or select according to actual needs one group of parameter configuration.For example, common selection changes the punching limit, keeps the constant parameter combinations of transformat combination, thus the compatibility of assurance and other processing.
After the channel coding rate of adjusting access user, return to step 102, continue under the channel coding rate after adjustment, the target SIR of monitoring access user, and take the raising speed thresholding of adjusting rear channel coding rate and reduction of speed thresholding as basis, judge whether to carry out the adjustment of channel coding rate.
Step 105, the code channel invariable number that keeps access user to take, reduce the channel coding rate of this access user, and return to step 102.
While in this step, carrying out the reduction of speed of channel coding rate, the code channel invariable number that keeps access user to take.Concrete processing is similar with the processing of step 104, just the adjustment direction difference of channel coding rate.Particularly, the code channel number taken at access user now, according in the corresponding code channel number various optional channel coding rate now arranged in step 101, selection is a kind of lower than current channel coding rate, then the channel coding rate of selection is configured to access user.
Wherein, while selecting a kind of optional channel coding rate lower than current channel coding rate, in the various optional channel coding rate that can arrange in step 101, adopt the mode of reduction step by step or select the mode of disposable reduction.
In the mode reduced step by step, namely, in optional channel coding rate, select the highest channel coding rate lower than current channel coding rate, thereby realize the steady reduction of channel coding rate; In the mode of disposable reduction, namely, in optional channel coding rate, select minimum channel coding rate, disposable code rate is down to minimum, to reduce to greatest extent user bandwidth.For example, under the setting of table 1, suppose that under 8VRU, current channel coding rate is 96k, when this step is selected, if according to reducing step by step mode, select the channel coding rate of 88k to configure to access user; If according to disposable reduction mode, select the channel coding rate of 64k to configure to access user.
When the channel coding rate by selection configures to access user, be about to one group of parameter configuration corresponding to this channel coding rate to access user, specifically can reshuffle RB RECFG message or TFC Control carries out the design parameter configuration by radio bearer, certainly also be not limited to above-mentioned configuration mode.Access user carries out the chnnel coding processing according to the relevant parameter (comprising the punching limit, parameters of rate matching and transformat combination) of configuration, namely can realize corresponding channel coding rate.Wherein, when the channel coding rate correspondence is organized relevant parameter, can select arbitrarily one group of parameter to be configured more, or select according to actual needs one group of parameter configuration.For example, common selection changes the punching limit, keeps the constant parameter combinations of transformat combination, thus the compatibility of assurance and other processing.
After the channel coding rate of adjusting access user, return to step 102, continue under the channel coding rate after adjustment, the target SIR of monitoring access user, and take the raising speed thresholding of adjusting rear channel coding rate and reduction of speed thresholding as basis, judge whether to carry out the adjustment of channel coding rate.
Step 106, maintain current channel coding rate constant, and return to step 102.
So far, the coding gain control method flow process in the embodiment of the present invention finishes.
Visible by above-mentioned flow process, the coding gain control method that the present invention provides, can be according to link quality condition, channel coding rate to access user is adjusted in real time, thereby control coding gain, under the prerequisite that guarantees access user quantity and data receiver performance, improve as far as possible user bandwidth, improve user's experience.
These are only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (7)
1. the dynamic control method of a channel coding gain, it is characterized in that, the various code channel numbers that take of respective user in advance, the channel coding rate of plurality of optional is set, and be every kind of optional channel coding rate, be arranged on corresponding code channel number raising speed thresholding and the reduction of speed thresholding of this channel coding rate now; When arbitrary access user was carried out to the control of channel coding gain, the method comprised:
Determine code channel number and current channel coding rate that described access user takies, and the target signal interference ratio SIR of described access user is monitored;
If the target SIR of described access user takies lower than this access user in the first Preset Time code channel number is the raising speed thresholding of current channel coding rate now always, the code channel invariable number that keeps this CU, the channel coding rate of this access user that raises;
If the target SIR of described access user takies higher than this access user in the second Preset Time code channel number is the reduction of speed thresholding of current channel coding rate now always, the code channel invariable number that keeps this CU, reduce the channel coding rate of this access user;
Wherein, at arbitrary code channel number now, by the punching limit, parameters of rate matching and transformat combination, various described channel coding rate are set.
2. method according to claim 1, it is characterized in that, described arrange corresponding code channel number now raising speed thresholding and the reduction of speed thresholding of this channel coding rate be: under described code channel number and described channel coding rate, target SIR under disturbance is carried out to emulation, determine described raising speed thresholding and reduction of speed thresholding according to simulation result.
3. method according to claim 1, it is characterized in that, the channel coding rate of described this access user of rising is: the code channel number taken at described access user now, from various optional channel coding rate, selecting a kind of higher than current channel coding rate, the channel coding rate of selection is configured to described access user.
4. method according to claim 3, it is characterized in that, describedly from various optional channel coding rate, selecting higher than a kind of of current channel coding rate, be: from various optional channel coding rate, the highest and a kind of higher than current channel coding rate of selective channel code rate, perhaps, from minimum a kind of of selective channel code rate the various optional channel coding rate higher than current channel coding rate.
5. method according to claim 1, it is characterized in that, the channel coding rate of described this access user of reduction is: the code channel number taken at described access user now, from various optional channel coding rate, selecting a kind of lower than current channel coding rate, the channel coding rate of selection is configured to described access user.
6. method according to claim 5, it is characterized in that, describedly from various optional channel coding rate, selecting lower than a kind of of current channel coding rate, be: from various optional channel coding rate, minimum and a kind of lower than current channel coding rate of selective channel code rate, perhaps, from the highest a kind of of selective channel code rate the various optional channel coding rate lower than current channel coding rate.
7. according to the described method of claim 3 or 5, it is characterized in that, reshuffle RB RECFG message or TFC Control by radio bearer, the channel coding rate of selection is configured to described access user.
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