CN101944928B - Method and device for improving system performance in Multicast Broadcast Signal Frequency Network (MBSFN) system - Google Patents
Method and device for improving system performance in Multicast Broadcast Signal Frequency Network (MBSFN) system Download PDFInfo
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- CN101944928B CN101944928B CN 200910054726 CN200910054726A CN101944928B CN 101944928 B CN101944928 B CN 101944928B CN 200910054726 CN200910054726 CN 200910054726 CN 200910054726 A CN200910054726 A CN 200910054726A CN 101944928 B CN101944928 B CN 101944928B
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Abstract
The invention discloses a method and a device for improving system performance in a Multicast Broadcast Signal Frequency Network (MBSFN) system. The method comprises the following steps: when next time slot sends business data, receiving the current time slot data and a Preamble code of the next time slot; calculating the power of the Preamble code of the current time slot and the power of the Preamble code of the next time slot to obtain the Preamble code power value of the current time slot and the Preamble code power value of the next time slot; and comparing the Preamble code power value of the current time slot with the Preamble code power value of the next time slot, and determining to use the Preamble code of the current time slot, or the Preamble code of the next time slot, or the combination value of the Preamble code of the current time slot and the Preamble code of the next time slot for channel estimation according to the compared result. The invention can improve the veracity of the channel estimation and system performance.
Description
Technical field
The present invention relates to communication technical field, relate in particular to the method and apparatus that improves systematic function in a kind of MBSFN system.
Background technology
At present, Multicast Broadcast Single Frequency Network (MBSFN, Multicast Broadcast Single FrequencyNetwork) uses the Preamble sign indicating number in the current time slots to carry out channel estimating in the system, then the result of channel estimating is applied to data division and carries out data demodulates.
Yet because the channel circumstance more complicated of MBSFN system, the additive noise in the channel and the influence of multipath channel can make the result of channel estimating produce certain deviation.Therefore only use the method for the channel estimating that the Preamble sign indicating number of current time slots carries out to have certain limitation in the prior art.
Summary of the invention
The embodiment of the invention provides the method and apparatus that improves systematic function in a kind of MBSFN system, can improve the accuracy of channel estimating, significantly improves the performance of system.
The embodiment of the invention provides following technical scheme:
Improve the method for systematic function in a kind of MBSFN system, comprising:
When a time slot has business datum to send instantly, receive the Preamble sign indicating number of current time slots data and next time slot;
The power of the Preamble sign indicating number of calculating current time slots and the Preamble sign indicating number of next time slot obtains the Preamble sign indicating number performance number of current time slots and the Preamble sign indicating number performance number of next time slot;
Preamble sign indicating number performance number and next time slot Preamble sign indicating number performance number of described current time slots are compared, determine to use the Preamble sign indicating number of current time slots or the Preamble sign indicating number of next time slot or the combined value of current time slots Preamble sign indicating number and next time slot Preamble sign indicating number to carry out channel estimating according to comparative result.
Preferably, described method also comprises: utilize the result of described channel estimating that the data of current time slots are carried out demodulation.
Preferably, described with described current time slots Preamble sign indicating number performance number and the Preamble sign indicating number performance number of next time slot compare, and determine to use the Preamble sign indicating number of current time slots or the Preamble sign indicating number of next time slot or the combined value of current time slots Preamble sign indicating number and next time slot Preamble sign indicating number to carry out channel estimating according to comparative result, comprising:
If the Preamble sign indicating number performance number of current time slots manys first threshold than the Preamble sign indicating number performance number of next time slot, then use the Preamble sign indicating number of current time slots to carry out channel estimating;
If the Preamble sign indicating number performance number of current time slots is lacked second threshold value than the Preamble sign indicating number performance number of next time slot, then use the Preamble sign indicating number of next time slot to carry out channel estimating;
Otherwise the combined value of the Preamble sign indicating number of use current time slots and the Preamble sign indicating number of next time slot carries out channel estimating.
Preferably, the value of described first threshold is between 1dB to 2dB; The value of described second threshold value is between 2dB to 3dB.
Preferably, the combined value of the Preamble sign indicating number of the Preamble sign indicating number of described current time slots and next time slot is:
The Preamble sign indicating number additive value of the Preamble sign indicating number of current time slots and next time slot, or the Preamble sign indicating number weighting summation value of the Preamble sign indicating number of current time slots and next time slot.
Preferably, described method also comprises:
Judge whether next time slot has business datum to send.
Meanwhile, the present invention also provides the device that improves systematic function in a kind of MBSFN system, comprising:
The data receiving element is for the Preamble sign indicating number that receives current time slots data and next time slot;
Power calculation unit be used for to be calculated the power of the Preamble sign indicating number of the Preamble sign indicating number of current time slots and next time slot, obtains the Preamble sign indicating number performance number of current time slots and the Preamble sign indicating number performance number of next time slot;
Channel estimating unit, be used for Preamble sign indicating number performance number and next time slot Preamble sign indicating number performance number of described current time slots are compared, determine to use the Preamble sign indicating number of current time slots or the Preamble sign indicating number of next time slot or the combined value of current time slots Preamble sign indicating number and next time slot Preamble sign indicating number to carry out channel estimating according to comparative result.
Preferably, described device also comprises:
Data demodulation unit is used for utilizing the result of described channel estimating that the data of current time slots are carried out demodulation.
Preferably, many first threshold if described comparative result is the Preamble sign indicating number performance number of current time slots than the Preamble sign indicating number performance number of next time slot, then the Preamble sign indicating number of described channel estimating unit use current time slots carries out channel estimating;
Lack second threshold value if described comparative result is the Preamble sign indicating number performance number of current time slots than the Preamble sign indicating number performance number of next time slot, then described channel estimating unit uses the Preamble sign indicating number of next time slot to carry out channel estimating;
Otherwise the combined value of the Preamble sign indicating number of described channel estimating unit use current time slots and the Preamble sign indicating number of next time slot carries out channel estimating.
Preferably, the value of described first threshold is between 1dB to 2dB; The value of described second threshold value is between 2dB to 3dB.
Preferably, described channel estimating unit is used the Preamble sign indicating number of current time slots and the Preamble sign indicating number additive value of next time slot, or the Preamble sign indicating number weighting summation value of the Preamble sign indicating number of current time slots and next time slot is carried out channel estimating.
Preferably, described device also comprises:
Judge indicating member, be used for judging whether next time slot has business datum to send, and when judging that next time slot has business datum to send, the designation data receiving element receives data.
Preferably, described device is terminal, perhaps is a functional entity in the terminal.
Improve the method and apparatus of systematic function in the MBSFN system that the embodiment of the invention provides, carry out the situation of channel estimating based on the Preamble sign indicating number that only uses current time slots in the prior art, proposed when all there are MBMS broadcasting in current time slots and next time slot, the associated value of the Preamble sign indicating number of the Preamble sign indicating number of in good time next time slot of selection or the Preamble sign indicating number of current time slots and next time slot is carried out the technical scheme of channel estimating, thereby can improve channel estimation accuracy, and channel estimation results is applied to data demodulates more accurately, can make systematic function obtain bigger improvement and raising.
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 is SFN frame slot structural representation in the prior art;
Fig. 2 is the method overview flow chart that the embodiment of the invention improves systematic function;
Fig. 3 is the method particular flow sheet that the embodiment of the invention improves systematic function;
Fig. 4 is the device summary structural representation that the embodiment of the invention improves systematic function;
Fig. 5 is the device concrete structure schematic diagram that the embodiment of the invention improves systematic function;
Fig. 6 is another concrete structure schematic diagram of device that the embodiment of the invention improves systematic function.
Embodiment
The embodiment of the invention provides the method and apparatus that improves systematic function in a kind of MBSFN system, can improve the accuracy of channel estimating, improves the performance of system.For making purpose of the present invention, technical scheme and advantage clearer, the embodiment that develops simultaneously with reference to the accompanying drawings, the present invention is described in more detail.
As shown in Figure 1, be SFN frame slot structural representation in the prior art, it is made up of Preamble sign indicating number and data-signal (data).The data of current time slots are between the Preamble of the Preamble of current time slots sign indicating number and next time slot sign indicating number under Single Frequency Network (SFN, Single Frequency Network) mode.All there is multi-media broadcasting service (MBMS in current time slots and next time slot, MultimediaBroadcast Multicast Service) time, because the data of current time slots and the Preamble sign indicating number of next time slot combine and also can be combined into a new time slot, therefore the in good time selection of the present invention uses the Preamble sign indicating number of current time slots or Preamble sign indicating number or both combinations of next time slot to carry out channel estimating, thereby obtain channel estimation results more accurately, then channel estimation results is applied to the current time slots data again and carries out data demodulates, and then improve the performance of system.
The method overview flow chart of systematic function is improved in the MBSFN system that provides for the embodiment of the invention as shown in Figure 2.Described method comprises:
Particularly, receiver side can judge further whether next time slot has business datum to send, for example can be according to multiple spot control channel (MCCH, Multipoint Control CHannel) confirms whether next time slot exists multi-media broadcasting service (MBMS, Multimedia Broadcasting Multicast Service), if there is no, then user's side is used the method for single time slot channel estimating, if exist, then user's side joint is received the Preamble sign indicating number of current time slots data and next time slot.
The power of the Preamble sign indicating number of step 202, the Preamble sign indicating number that calculates current time slots and next time slot obtains the Preamble sign indicating number performance number of current time slots and the Preamble sign indicating number performance number of next time slot;
Particularly, the received power of the Preamble sign indicating number of current time slots Preamble sign indicating number and next time slot is calculated, obtained the received power value of the Preamble sign indicating number of the received power value of Preamble sign indicating number of current time slots and next time slot.
Particularly, the received power value of the Preamble sign indicating number of described current time slots and the received power value of next time slot Preamble sign indicating number are compared, comparative result can be divided into following three kinds of situations:
First kind of situation: the received power value of current time slots Preamble sign indicating number is than the high M dB of received power value of next time slot Preamble sign indicating number, and wherein the M value is between 1-2.For this situation, can continue to use channel estimating mode of the prior art, namely use the Preamble sign indicating number of current time slots to carry out channel estimating.
Second kind of situation: the received power value of current time slots Preamble sign indicating number is than the low N dB of received power value of next time slot Preamble sign indicating number, and wherein the N value is between 2-3.For this situation, can use the Preamble sign indicating number of next time slot to carry out channel estimating.The gain that its channel estimation gains is brought than current time slots along with next time slot and improving.For example, next time slot is than the high 4dB of current time slots power, and then channel estimation results has the 4dB gain, and obviously systematic function is improved.
The third situation: for the situation except above-mentioned first and second two kinds of situations, can use the combined value of current time slots Preamble sign indicating number and next time slot Preamble sign indicating number to carry out channel estimating.Can there be gain in channel estimating in this case, and when the Preamble of current time slots sign indicating number performance number was identical with next time slot Preamble sign indicating number performance number, can there be the gain of maximum 3dB in channel estimating in theory.And when the Preamble of current time slots sign indicating number performance number and next time slot Preamble sign indicating number performance number are inequality, gain that channel estimating is brought is also inequality, will get well much with only using the result who carries out channel estimating when previous time slot Preamble sign indicating number in the prior art, obviously this kind situation also can make systematic function be improved.
Based on above-mentioned three kinds of situations, can see that under first kind of situation, systematic function is identical with original performance at least, and under second kind and the third situation, channel estimating can be brought gain, systematic function can be improved.
Need to prove, because the multiple channel estimation methods that the present invention can use prior art to provide when carrying out channel estimating, for example correlation technique, LS method, FFT method etc., the present invention does not carry out too much description to the specific algorithm of these channel estimating.
Below by a concrete example such scheme of the present invention is described further.
The method particular flow sheet of systematic function is provided in the MBSFN system that provides for the embodiment of the invention as shown in Figure 3.Described method specifically comprises:
Step 301, reception current time slots Preamble sign indicating number and data, and next time slot Preamble sign indicating number;
Step 302, the Preamble sign indicating number of current time slots and the Preamble sign indicating number of next time slot are carried out power calculation, obtain current time slots power P curr and next time slot power Pnext.
Step 303, current time slots power P curr and next time slot power Pnext are compared, specifically:
If Pcurr＞A*Pnext does not deal with and directly changes step 306 over to;
If B*Pcurr＜Pnext changes step 304 over to;
Other situations except Pcurr＞A*Pnext and B*Pcurr＜Pnext change step 305 over to;
Step 304, use the Preamble sign indicating number of next time slot to substitute the Preamble sign indicating number of current time slots;
Step 305, the additive value of current time slots Preamble sign indicating number and next time slot Preamble sign indicating number substituted the Preamble sign indicating number of current time slots;
Step 306, carry out channel estimating at current time slots Preamble sign indicating number, so that follow-up this channel estimation results that utilizes when carrying out data demodulates.
Need to prove that the A in the above-mentioned steps and the calculating of B are to calculate by the M in aforementioned and N, Calculation Method is M=10*lgA and N=10*lgB.
Wherein, be that current time slots Preamble sign indicating number and next time slot Preamble sign indicating number are carried out addition in the above-mentioned steps 305, the present invention is not limited in this mode of addition, also can use alternate manners such as weighting summation that current time slots Preamble sign indicating number and next time slot Preamble sign indicating number are made up.When current time slots Preamble sign indicating number and next time slot Preamble sign indicating number are identical data, power is 4 times (converting dB to is 6dB) of original data after its addition, if current time slots Preamble sign indicating number and next time slot Preamble code data are at random, see that statistically power is 2 times (converting dB to is 3dB) of original data after both additions.Therefore for the Preamble sign indicating number, if being made up back power, current time slots Preamble sign indicating number and next time slot Preamble sign indicating number can increase 6dB at most, and noise increases 3dB at most, at this moment signal can increase because of the combination of current time slots Preamble sign indicating number and next time slot Preamble sign indicating number, can reach the purpose that improves signal to noise ratio.
In addition, after the Preamble sign indicating number in use step 304 and the step 305 was used for channel estimating, the amplitude of channel estimation results can become greatly, therefore needed the part that amplitude increases is compensated accordingly in data demodulates.
As shown in Figure 4, the device that systematic function is improved in the MBSFN system that provides for the embodiment of the invention is summarized structural representation.This device comprises: data receiving element 410, power calculation unit 420, channel estimating unit 430; Wherein:
Described data receiving element 410 is for the Preamble sign indicating number that receives current time slots data and next time slot;
Described power calculation unit 420 be used for to be calculated the power of the Preamble sign indicating number of the Preamble sign indicating number of current time slots and next time slot, obtains the Preamble sign indicating number performance number of current time slots and the Preamble sign indicating number performance number of next time slot;
Described channel estimating unit 430, be used for Preamble sign indicating number performance number and next time slot Preamble sign indicating number performance number of described current time slots are compared, determine to use the Preamble sign indicating number of current time slots or the Preamble sign indicating number of next time slot or the combined value of current time slots Preamble sign indicating number and next time slot Preamble sign indicating number to carry out channel estimating according to comparative result.
The device concrete structure schematic diagram of systematic function is provided in the MBSFN system that provides for the embodiment of the invention as shown in Figure 5.This device comprises: data receiving element 510, power calculation unit 520, channel estimating unit 530, data demodulation unit 540; Wherein:
Described data receiving element 510 is used for receiving current time slots Preamble sign indicating number and data, and the Preamble sign indicating number of next time slot;
Described power calculation unit 520 be used for to be calculated the power of the Preamble sign indicating number of the Preamble sign indicating number of current time slots and next time slot, obtains the Preamble sign indicating number performance number of current time slots and the Preamble sign indicating number performance number of next time slot;
Described channel estimating unit 530 is used for Preamble sign indicating number performance number and next time slot Preamble sign indicating number performance number of described current time slots are compared, specifically:
Many first threshold if described comparative result is the Preamble sign indicating number performance number of current time slots than the Preamble sign indicating number performance number of next time slot, then the Preamble sign indicating number of described channel estimating unit 530 use current time slots carries out channel estimating; Lack second threshold value if described comparative result is the Preamble sign indicating number performance number of current time slots than the Preamble sign indicating number performance number of next time slot, then described channel estimating unit 530 uses the Preamble sign indicating number of next time slot to carry out channel estimating; Otherwise, the combined value of the Preamble sign indicating number of described channel estimating unit 530 use current time slots and the Preamble sign indicating number of next time slot carries out channel estimating, for example, described channel estimating unit is used the Preamble sign indicating number of current time slots and the Preamble sign indicating number additive value of next time slot, or the Preamble sign indicating number weighting summation value of the Preamble sign indicating number of current time slots and next time slot is carried out channel estimating.Wherein, the value of described first threshold is between 1dB to 2dB; The value of described second threshold value is between 2dB to 3dB.
Described data demodulation unit 540 is used for utilizing the result of described channel estimating that the data of current time slots are carried out demodulation.
Another concrete structure schematic diagram of device of systematic function is provided in the MBSFN system that provides for the embodiment of the invention as shown in Figure 6.This device can also comprise except comprising the described functional unit of above-described embodiment: judge indicating member 600; Wherein:
Described judgement indicating member 600 is used for judging whether next time slot has business datum to send, and when judging that next time slot has business datum to send, designation data receiving element 610 receives the Preamble sign indicating number of time slot down.
Need to prove that described device can be terminal, perhaps is a functional entity in the terminal.
The embodiment of the invention also further provides a kind of MBSFN system, comprises the described device of above-described embodiment, specifies and sees above-described embodiment for details, repeats no more herein.
One of ordinary skill in the art will appreciate that and realize that all or part of step that above-described embodiment method is carried is to instruct relevant hardware to finish by program, described program can be stored in a kind of computer-readable recording medium, this program comprises one of step or its combination of method embodiment when carrying out.
In addition, each functional unit in each embodiment of the present invention can be integrated in the processing module, also can be that the independent physics in each unit exists, and also can be integrated in the module two or more unit.Above-mentioned integrated module both can adopt the form of hardware to realize, also can adopt the form of software function module to realize.If described integrated module realizes with the form of software function module and during as independently production marketing or use, also can be stored in the computer read/write memory medium.
The above-mentioned storage medium of mentioning can be read-only memory, disk or CD etc.
In sum, this paper provides the method and apparatus that improves systematic function in a kind of MBSFN system, carry out the situation of channel estimating based on the Preamble sign indicating number that only uses current time slots in the prior art, proposed when all there are MBMS broadcasting in current time slots and next time slot, the associated value of the Preamble sign indicating number of the Preamble sign indicating number of in good time next time slot of selection or the Preamble sign indicating number of current time slots and next time slot is carried out the technical scheme of channel estimating, thereby can improve channel estimation accuracy, and channel estimation results is applied to data demodulates more accurately, can make systematic function obtain bigger improvement and raising.
More than the method and apparatus that improves systematic function in the MBSFN provided by the present invention system is described in detail, used specific case herein principle of the present invention and execution mode are set forth, the explanation of above embodiment just is used for helping to understand the solution of the present invention; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, the part that all can change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (11)
1. improve the method for systematic function in the MBSFN system, it is characterized in that, comprising:
When a time slot has business datum to send instantly, receive the Preamble sign indicating number of current time slots data and next time slot;
The power of the Preamble sign indicating number of calculating current time slots and the Preamble sign indicating number of next time slot obtains the Preamble sign indicating number performance number of current time slots and the Preamble sign indicating number performance number of next time slot;
If the Preamble sign indicating number performance number of current time slots manys first threshold than the Preamble sign indicating number performance number of next time slot, then use the Preamble sign indicating number of current time slots to carry out channel estimating;
If the Preamble sign indicating number performance number of current time slots is lacked second threshold value than the Preamble sign indicating number performance number of next time slot, then use the Preamble sign indicating number of next time slot to carry out channel estimating;
Otherwise the combined value of the Preamble sign indicating number of use current time slots and the Preamble sign indicating number of next time slot carries out channel estimating.
2. improve the method for systematic function in the MBSFN according to claim 1 system, it is characterized in that, also comprise: utilize the result of described channel estimating that the data of current time slots are carried out demodulation.
3. improve the method for systematic function in the MBSFN according to claim 1 system, it is characterized in that the value of described first threshold is between 1dB to 2dB; The value of described second threshold value is between 2dB to 3dB.
4. improve the method for systematic function in the MBSFN according to claim 1 system, it is characterized in that the combined value of the Preamble sign indicating number of described current time slots and the Preamble sign indicating number of next time slot is:
The Preamble sign indicating number additive value of the Preamble sign indicating number of current time slots and next time slot, or the Preamble sign indicating number weighting summation value of the Preamble sign indicating number of current time slots and next time slot.
5. improve the method for systematic function in the MBSFN according to claim 1 system, it is characterized in that, also comprise:
Judge whether next time slot has business datum to send.
6. improve the device of systematic function in the MBSFN system, it is characterized in that, comprising:
The data receiving element is for the Preamble sign indicating number that receives current time slots data and next time slot;
Power calculation unit be used for to be calculated the power of the Preamble sign indicating number of the Preamble sign indicating number of current time slots and next time slot, obtains the Preamble sign indicating number performance number of current time slots and the Preamble sign indicating number performance number of next time slot;
Channel estimating unit, be used for Preamble sign indicating number performance number and next time slot Preamble sign indicating number performance number of described current time slots are compared, many first threshold if comparative result is the Preamble sign indicating number performance number of current time slots than the Preamble sign indicating number performance number of next time slot, then use the Preamble sign indicating number of current time slots to carry out channel estimating; Lack second threshold value if comparative result is the Preamble sign indicating number performance number of current time slots than the Preamble sign indicating number performance number of next time slot, then use the Preamble sign indicating number of next time slot to carry out channel estimating; Otherwise the combined value of the Preamble sign indicating number of use current time slots and the Preamble sign indicating number of next time slot carries out channel estimating.
7. improve the device of systematic function in the MBSFN according to claim 6 system, it is characterized in that described device also comprises:
Data demodulation unit is used for utilizing the result of described channel estimating that the data of current time slots are carried out demodulation.
8. improve the device of systematic function in the MBSFN according to claim 6 system, it is characterized in that the value of described first threshold is between 1dB to 2dB; The value of described second threshold value is between 2dB to 3dB.
9. improve the device of systematic function in the MBSFN according to claim 6 system, it is characterized in that, described channel estimating unit is used the Preamble sign indicating number of current time slots and the Preamble sign indicating number additive value of next time slot, or the Preamble sign indicating number weighting summation value of the Preamble sign indicating number of current time slots and next time slot is carried out channel estimating as described combined value.
10. improve the device of systematic function in the MBSFN according to claim 6 system, it is characterized in that, also comprise:
Judge indicating member, be used for judging whether next time slot has business datum to send, and when judging that next time slot has business datum to send, the designation data receiving element receives data.
11. the device according to improving systematic function in any described MBSFN system of claim 6 to 10 is characterized in that described device is terminal, perhaps is a functional entity in the terminal.
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| WO2006122779A1 (en) * | 2005-05-20 | 2006-11-23 | Telefonaktiebolaget L M Ericsson (Publ) | Method and apparatus for communication channel error rate estimation |
| CN101212430A (en) * | 2007-12-25 | 2008-07-02 | 北京创毅视讯科技有限公司 | Channel estimating method and its device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2006122779A1 (en) * | 2005-05-20 | 2006-11-23 | Telefonaktiebolaget L M Ericsson (Publ) | Method and apparatus for communication channel error rate estimation |
| CN101212430A (en) * | 2007-12-25 | 2008-07-02 | 北京创毅视讯科技有限公司 | Channel estimating method and its device |
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