CN101242290A - Descrambling allocation method and channel estimation method in multicast multimedia service - Google Patents
Descrambling allocation method and channel estimation method in multicast multimedia service Download PDFInfo
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- CN101242290A CN101242290A CNA2007100075775A CN200710007577A CN101242290A CN 101242290 A CN101242290 A CN 101242290A CN A2007100075775 A CNA2007100075775 A CN A2007100075775A CN 200710007577 A CN200710007577 A CN 200710007577A CN 101242290 A CN101242290 A CN 101242290A
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Abstract
The invention discloses a method for distributing scramble in a multicast multimedia service, comprising distributing a same scramble to multicast multimedia service MBMS pilot frequency in consecutive subzones of a same area. The invention also discloses a channel estimation method in the multicast multimedia service which distributes a same scramble to MBMS pilot frequency in consecutive subzones of a same area, and the method comprises: determining that the MBMS sent by the consecutive subzones are incomplete identical; carrying out a channel estimation by the MBMS pilot frequency and the pilot frequency of consecutive subzones. The method can avoid scramble confusion, increase channel estimation performance, and make the user correctly demodulate different MBMS data.
Description
Technical field
The present invention relates to multicast multimedia service (MBMS) technology, be meant a kind of method of scrambler and method of channel estimating of in MBMS, distributing especially.
Background technology
MBMS is meant that network sends to a plurality of users in the network to same multimedia service data.A MBMS user can receive one or more MBMS business simultaneously at synchronization, that is to say, at synchronization, network side can send a plurality of MBMS business simultaneously.In MBMS, in order to make subscriber equipment (UE) receive the MBMS business better, increase the susceptibility of user to business, used the folding of eating dishes without rice or wine at the UE receiving terminal, according to this technology, UE will be from the watt level that neighbor cell receives the signal of different identical services, merge as the different multipath components of a signal, thereby obtain bigger gain.
At MBMS, be provided with the dedicated pilot that is specifically designed to MBMS, be designated hereinafter simply as the MBMS pilot tone.In existing prior art, the situation of described MBMS pilot tone and MBMS traffic assignments scrambler there are following two kinds.
In prior art one, adopt the sub-district public identifier (Cell-common-idbased on location) in position-based zone, this is meant, to the MBMS pilot tone and the MBMS business of all sub-districts in the same area, distributes identical scrambler to carry out scrambling respectively; And in same sub-district, distinguish with different spreading codes different MBMS is professional.
Figure 1 shows that the sub-district public identifier schematic diagram in position-based zone in the prior art one.Suppose that regional A shown in Figure 1 comprises sub-district A1 and A2, area B comprises sub-district B1 and B2.According to prior art one, to the MBMS pilot tone of sub-district A1 in the regional A and A2, use identical scrambler to carry out scrambling, also use identical scrambler to carry out scrambling to the MBMS business.Same, to MBMS pilot tone and the MBMS business of sub-district B1 in the area B and B2, also use identical scrambler to carry out scrambling respectively.
Adopt the method for prior art one, have following two shortcomings.
Shortcoming one:
According to prior art one, in identical Transmission Time Interval (TTI), the different MBMS business of the neighbor cell in the same area may be used identical scrambler and spreading code, at this moment, can produce between these two MBMS business and disturb.For example, in Fig. 1, professional 1 is sent by sub-district A1, and professional 2 are sent by sub-district A2, if in identical TTI, professional 1 and the identical spreading code of professional 2 uses, then at the intersection of sub-district A1 and sub-district A2, professional 1 pair of business 2 produces to be disturbed, same, and business 2 also produces professional 1 and disturbs.
Shortcoming two:
According to prior art one, when the neighbor cell in the same area sends different MBMS business, because described neighbor cell uses identical scrambler that the MBMS pilot tone is carried out scrambling, and to the identical spreading code of MBMS pilot tone use, therefore, at the boundary of described neighbor cell, UE can be with two MBMS pilot tones of neighbor cell respectively as the different multipath components of a MBMS pilot tone, thereby can not distinguish the different MBMS business datum of correct demodulation.As shown in Figure 1, suppose that the sub-district A1 that is arranged in regional A sends business 1, send MBMS pilot tone pilot1, the sub-district A2 that is arranged in regional A sends business 2, sends MBMS pilot tone pilot2.Because pilot1 and pilot2 use identical scrambler and spreading code, so, for example be positioned at the UE of the intersection of sub-district A1 and sub-district A2, pilot1 and pilot2 are regarded as the different multipath components of a pilot signal pilotA.Like this, when UE receive professional 1 the time, can be with pilotA as being that pilot1 carries out channel estimating, causing can not correctly demodulation business 1, for another example, when UE receives professionally 2 the time, also pilotA can be treated as is that pilot2 carries out channel estimating, causing can not correctly demodulation business 2.
In prior art two, adopt sub-district public identifier (Cell-common-id basedon service) based on business, that is, send the sub-district of identical MBMS business, distribute identical scrambler to carry out scrambling to MBMS is professional respectively with the MBMS pilot tone.
Figure 2 shows that, in the prior art two, based on the sub-district public identifier schematic diagram of business.In Fig. 2, suppose that the zone of the professional A of transmission is service area A, the zone that sends professional B is service area B, the zone that sends professional C is service area C.At this moment, all sub-districts in service area A use identical scrambler that professional A is carried out scrambling, use identical scrambler that the MBMS pilot tone of all sub-districts in this service area A is carried out scrambling; All sub-districts in service area B use identical scrambler that professional B is carried out scrambling, use identical scrambler that the MBMS pilot tone of all sub-districts in this service area B is carried out scrambling; All sub-districts in service area C use identical scrambler that professional C is carried out scrambling, use identical scrambler that the MBMS pilot tone of all sub-districts in this service area C is carried out scrambling.
According to prior art two, can there be following problem: among Fig. 2, be in the interior sub-district of common region of service area A and service area B, sub-district A1 for example, when sub-district A1 need send professional A and professional B simultaneously, owing to adopted sub-district public identifier in the prior art two based on business, professional A is used different scramblers respectively with professional B, and because professional A belongs to different service areas respectively with professional B, thereby when causing that the MBMS pilot tone of sub-district A1 carried out scrambling, the scrambler operating position is obscured.
Summary of the invention
The embodiment of the invention provides a kind of method of distributing scrambler in multicast multimedia service, can improve channel estimating performance, thereby make the different MBMS business datum of the correct demodulation of user.
The embodiment of the invention provides a kind of method of distributing scrambler in multicast multimedia service, can avoid MBMS pilot tone scrambler to use and obscure problem.
The invention provides a kind of method of distributing scrambler in multicast multimedia service, this method comprises: to the MBMS pilot tone of the neighbor cell in the same area, distribute identical scrambler.
The scrambling code distribution method that provides according to the embodiment of the invention for example can be to the identical scrambler of MBMS pilot frequency distribution based on all sub-districts in the zone that comprises a plurality of service areas of delineation of activities, thereby avoids scrambler to use the problem of obscuring.
The embodiment of the invention provide a kind of in multicast multimedia service channel estimation methods, improve channel estimating performance, thereby make the different MBMS business datum of the correct demodulation of user.
The embodiment of the invention provide a kind of in multicast multimedia service channel estimation methods, the MBMS pilot frequency distribution of the neighbor cell in the same area has identical scrambler, this method comprises: determine that the MBMS business that described neighbor cell sends is incomplete same; Utilize the pilot tone of described MBMS pilot tone and described neighbor cell to carry out channel estimating.
The embodiment of the invention provide a kind of in multicast multimedia service channel estimation methods, the MBMS pilot frequency distribution of the neighbor cell in the same area has identical scrambler; In the time slot of MBMS traffic data channel, transmit pilot signal; This method comprises: the MBMS business of determining described neighbor cell transmission is incomplete same; After utilizing described MBMS pilot tone to carry out channel estimating, utilize described pilot signal that described channel estimating is revised.
The channel estimation methods that provides according to the embodiment of the invention, when the scrambler of the MBMS of neighbor cell pilot tone is identical, the channel estimating of utilizing the pilot tone correction of sub-district to utilize the MBMS pilot tone to carry out, perhaps, the channel estimating of utilizing the pilot signal correction added in the data slot to utilize the MBMS pilot tone to carry out, thereby the raising channel estimating performance makes the different MBMS business datum of the correct demodulation of user.
Description of drawings
Figure 1 shows that zone and sub-district schematic diagram that position-based is divided;
Figure 2 shows that zone and sub-district schematic diagram based on delineation of activities;
Figure 3 shows that scrambler distributes schematic diagram in the embodiment of the invention one;
Figure 4 shows that the pilot tone of utilizing the sub-district in the embodiment of the invention two carries out the schematic diagram of channel estimating;
Figure 5 shows that the variation schematic diagram of time slot format in the embodiment of the invention three.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, lift specific embodiment below, the present invention is further detailed explanation.
In the embodiment of the invention, when giving MBMS pilot frequency distribution scrambler, the scrambler identical to the MBMS pilot frequency distribution of the neighbor cell in the same area.Like this, the problem of channel estimating aspect not only can be solved, also the problem that the scrambler of MBMS pilot tone is obscured can be solved simultaneously.
Below, at different prior aries, provide the specific embodiment of scrambling code distribution method and channel estimation methods respectively.
Embodiment one:
At the shortcoming one of prior art one, present embodiment one provides the method for distributing the professional scrambler of MBMS.
In the present embodiment one,, distribute different scramblers to the different MBMS business of the neighbor cell in the zone that comprises a plurality of sub-districts of position-based division.According to the professional scrambling code distribution method of the MBMS of present embodiment one, because the scrambler difference of the MBMS business of the neighbor cell in the described zone, so, can reduce the phase mutual interference between the business of neighbor cell.
In the present embodiment one, when distributing the scrambler of MBMS pilot tone, to the identical scrambler of MBMS pilot frequency distribution of all sub-districts in the zone that comprises a plurality of sub-districts of position-based division.In order to prevent to disturb, the scrambler of the pilot tone of all sub-districts in scrambler that is distributed and the described zone is inequality.Wherein, the pilot tone of sub-district is meant the pilot tone (cell-specific pilot) based on the sub-district, is characterized as, and the scrambler of the pilot tone of each sub-district is different.
In present embodiment one, the scrambler of the scrambler of needs assurance MBMS pilot tone and the pilot tone of sub-district is inequality, so, when giving MBMS pilot frequency distribution scrambler, distribute and the different scrambler of the employed scrambler of the pilot tone of all sub-districts.At the spreading code of MBMS pilot tone, there is no particular limitation, can give the MBMS pilot frequency distribution spreading code identical with the spreading code of the pilot tone of sub-district, also can distribute the different spreading code of spreading code with the pilot tone of sub-district.
Fig. 3 illustrates the scrambling code distribution method that utilizes present embodiment one, to the result of the cell allocation scrambler in the zone shown in Figure 1.Among Fig. 3, represent different scramblers with the scrambler that different monograms are represented.
Embodiment two:
At the shortcoming two of prior art one, when the MBMS of the neighbor cell in the same area pilot frequency distribution had identical scrambler, present embodiment two provided channel estimation methods, to improve channel estimating performance.
In the present embodiment two, when determining that neighbor cell sends identical MBMS business, UE utilizes the MBMS pilot tone to carry out channel estimating; When the MBMS business of determining the neighbor cell transmission is incomplete same, utilize the pilot tone of MBMS pilot tone and neighbor cell to carry out channel estimating, be specially, utilize the MBMS pilot tone to carry out channel estimating earlier, utilize the pilot tone of sub-district that described channel estimating is revised then.Wherein, the number of neighbor cell can be two, also can be for more than two.
When providing UE below and being in the intersection of three adjacent sub-districts, carry out the process of channel estimating.
As shown in Figure 4, sub-district A1, sub-district A2, sub-district A3 are in regional A, and sub-district A1 and sub-district A2 send business 1, and sub-district A3 sends professional 2.When UE is in the intersection of sub-district A1, sub-district A2 and sub-district A3, if to receive professional 1, the base station that then needs to obtain sub-district A1 to the base station of the channel response of UE and sub-district A2 to the composite channel response of the channel response of UE.Below, for convenience, suppose that the channel response from the base station of sub-district A1 to UE is designated as h1, the channel response from the base station of sub-district A2 to UE is designated as h2, and the composite channel response of channel response h1 and h2 is designated as h1+h2.At this situation, can realize by the following method.
Because sub-district A1, sub-district A2, sub-district A3 use identical MBMS pilot tone, so, at first utilize described MBMS pilot tone to obtain the synthetic channel response h1+h2+h3 of sub-district A1, sub-district A2, sub-district A3, utilize the district pilots of sub-district A3 to estimate h3 then, both subtract each other the synthetic channel response h1+h2 that obtains sub-district A1 and sub-district A2.
In addition, as shown in Figure 3, the scrambler of the MBMS pilot tone in the zones of different is also different.Like this, as shown in Figure 4, sub-district B1, sub-district B2, sub-district B3 are in area B, when UE is in the intersection of sub-district A3 and sub-district B1, no matter whether sub-district A3 is identical with the business that sub-district B1 sends, UE utilizes the MBMS pilot tone of sub-district to carry out the business that channel estimating gets final product correct demodulation respective cell.Certainly, in this case, also can utilize the pilot tone of each sub-district to carry out channel estimating.
Channel estimation methods according to present embodiment two, when the scrambler of the MBMS of neighbor cell pilot tone is identical, the channel estimating of utilizing the pilot tone correction of sub-district to utilize the MBMS pilot tone to carry out, thus channel estimating performance improved, make the different MBMS business datum of the correct demodulation of user.
Embodiment three:
At the shortcoming two of prior art one, when the MBMS of the neighbor cell in the same area pilot frequency distribution had identical scrambler, present embodiment three can be reserved some spaces and transmit pilot frequency information in each time slot of MBMS traffic data channel.As shown in Figure 5, the time slot that transmits the MBMS business datum is divided into two parts, wherein a part is used for transmitting the MBMS business datum, and another part is used for transmitting pilot frequency information.
At this moment, when the MBMS business of determining the neighbor cell transmission is incomplete same, at first utilize the MBMS pilot tone to carry out after the channel estimating, utilize the pilot frequency information that carries in the time slot of MBMS traffic data channel that the channel estimating that the described MBMS of utilization pilot tone obtains is revised again, thus correct demodulation MBMS business datum.
According to present embodiment three described channel estimation methods, when the scrambler of the MBMS of neighbor cell pilot tone is identical, the channel estimating of utilizing the pilot signal correction added in the data slot to utilize the MBMS pilot tone to carry out, thereby the raising channel estimating performance makes the different MBMS business datum of the correct demodulation of user.
Embodiment four:
Shortcoming at prior art two, in the present embodiment four, when distributing the scrambler of MBMS pilot tone, to the identical scrambler of MBMS pilot frequency distribution based on all sub-districts in the zone that comprises a plurality of service areas of delineation of activities, the scrambler of the pilot tone of all sub-districts in scrambler that is distributed and the described zone is inequality.Like this, can avoid the scrambler of MBMS pilot tone to use the problem of obscuring.
Wherein, the described zone that comprises a plurality of service areas based on delineation of activities can for: as outermost great circle region D among Fig. 2, promptly comprise the bigger zone in the zone that service area A, service area B and service area 3 are covered.
In the present embodiment four, when distributing the scrambler of MBMS business, the scrambler identical to the MBMS traffic assignments of all sub-districts in the same service area, and the scrambler of the MBMS business of adjacent service area is inequality.
Distribute according to the scrambler in the present embodiment four, can cause the identical situation of scrambler of the MBMS pilot tone of neighbor cell, like this, also can have the inaccurate problem of channel estimating.At this problem, the channel estimation methods that can adopt embodiment two to provide, when utilizing the MBMS pilot tone to carry out channel estimating, can utilize the pilot tone of sub-district that the channel estimating that the described MBMS of utilization pilot tone obtains is revised, the perhaps channel estimation methods that also can adopt embodiment three to provide, promptly utilize the pilot signal of adding in the business datum time slot shown in Figure 5 that the channel estimating that the described MBMS of utilization pilot tone obtains is revised, concrete steps do not repeat them here as described in the embodiment two, three.
In the present embodiment four, all use identical scrambler owing to comprise the MBMS pilot tone of all sub-districts that the zone of a plurality of service areas is interior, so, can not exist MBMS pilot tone scrambler to use the problem of obscuring.
Embodiment five:
Shortcoming at prior art two, in the present embodiment five, when distributing the scrambler of MBMS pilot tone, to MBMS pilot tone based on all sub-districts in the zone of the different business region overlapping of delineation of activities, distribute with described service area in remove the scrambler scrambler inequality of the MBMS pilot tone of all sub-districts in the zone of described overlapping region.Like this, can avoid the scrambler of MBMS pilot tone to use the problem of obscuring.
In the present embodiment five, during to the MBMS pilot frequency distribution scrambler of the sub-district in the described overlapping region, specifically can adopt following two kinds of distribution methods.
A kind ofly be, all sub-districts in the zone of described different business region overlapping are comprised the MBMS pilot tone of neighbor cell, distribute identical scrambler.For example, the overlapping region of service area A and service area B is A﹠amp among Fig. 2; The B zone is supposed, removes described A﹠amp among the described service area A; The scrambler of the pilot tone of all sub-districts in the zone in B zone is a scrambler 1, and then to the MBMS pilot frequency distribution scrambler 2 of all sub-districts in the described overlapping region such as sub-district A1, sub-district A2, described scrambler 1 is different with scrambler 2.Like this, at A﹠amp; When sub-district in the B zone such as sub-district A1 send professional A and professional B simultaneously, can use 2 pairs of MBMS pilot tones of scrambler to carry out scrambling, can not exist scrambler to use the problem of obscuring.
Distribute according to this a kind of scrambler, because at regional A﹠amp; The scrambler of the MBMS pilot tone of the neighbor cell of B is identical, so also can there be the inaccurate problem of channel estimating.At this problem, the equally also channel estimation methods that can adopt embodiment two to provide, when utilizing the MBMS pilot tone to carry out channel estimating, can use the pilot tone of sub-district that the channel estimating that the described MBMS of utilization pilot tone obtains is revised, the perhaps channel estimation methods that also can adopt embodiment three to provide, promptly utilize the pilot signal of adding in the business datum time slot shown in Figure 5 that the channel estimating that the described MBMS of utilization pilot tone obtains is revised, concrete steps are as described in the embodiment two, three, in this omission.
Another kind is to the MBMS pilot tone of the neighbor cell in the zone of described different business region overlapping, to distribute different scramblers.For example, at regional A﹠amp shown in Figure 2; The MBMS pilot frequency distribution scrambler 2 of sub-district A1 among the B, the MBMS pilot frequency distribution scrambler 3 of sub-district A2.Wherein, scrambler 2 and scrambler 3 are removed described A﹠amp respectively with among the service area A; Scrambler 1 difference of the pilot tone of all sub-districts in the zone in B zone, thus can avoid scrambler to use the problem of obscuring.And because at regional A﹠amp; The scrambler difference of the MBMS pilot tone of neighbor cell among the B, so, at regional A﹠amp; Can there be the inaccurate situation of channel estimating among the B, can directly utilizes the MSMB pilot tone to carry out channel estimating.
In the present embodiment five, no matter whether the scrambler of the MBMS pilot tone of the neighbor cell in the overlapping region in different business zone is identical, as long as the scrambler of the MBMS pilot tone in the described overlapping region, inequality with the scrambler of the MBMS pilot tone of all sub-districts in other zone of removing described overlapping region in the described service area, then can avoid MBMS pilot tone scrambler to use and obscure problem.
The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (12)
1. method of distributing scrambler in multicast multimedia service is characterized in that this method comprises:
To the multicast multimedia service MBMS pilot tone of the neighbor cell in the same area, distribute identical scrambler.
2. method according to claim 1 is characterized in that,
Described zone is the zone that comprises a plurality of sub-districts that position-based is divided.
3. method according to claim 2 is characterized in that, this method further comprises:
To the different MBMS business of the neighbor cell in the zone that comprises a plurality of sub-districts of described position-based division, distribute different scramblers.
4. method according to claim 1 is characterized in that,
Described zone is the zone that comprises a plurality of service areas based on delineation of activities.
5. method according to claim 1 is characterized in that,
Described zone is the zone based on the different business region overlapping of delineation of activities.
6. method according to claim 5 is characterized in that,
The scrambler of MBMS pilot tone of all sub-districts in the zone of described different business region overlapping, inequality with the scrambler of the MBMS pilot tone of all sub-districts in other zones of removing described overlapping region in the described service area.
7. method according to claim 6 is characterized in that, the scrambler difference of the MBMS pilot tone of the neighbor cell in the zone of described different business region overlapping.
8. method according to claim 1 is characterized in that,
Distribute to the scrambler of described MBMS pilot tone, inequality with the scrambler of the pilot tone of all sub-districts in the described zone.
9. a channel estimation methods in multicast multimedia service is characterized in that, the MBMS pilot frequency distribution of the neighbor cell in the same area has identical scrambler, and this method comprises:
The MBMS business of determining described neighbor cell transmission is incomplete same;
Utilize the pilot tone of described MBMS pilot tone and described neighbor cell to carry out channel estimating.
10. method according to claim 9 is characterized in that, the described pilot tone of utilizing described MBMS pilot tone and described neighbor cell is carried out channel estimating and is:
Utilize described MBMS pilot tone to carry out channel estimating;
Utilize the pilot tone of described neighbor cell that described channel estimating is revised.
11. method according to claim 10 is characterized in that,
Utilize described MBMS pilot tone to carry out channel estimating to be: utilize the MBMS pilot tone to obtain the synthetic channel response of described neighbor cell;
Utilize the pilot tone of described neighbor cell that described channel estimating is modified to: the pilot tone that utilize to send the sub-district of different business obtains the channel response of this sub-district, removes the channel response of this sub-district from described synthetic channel response; Described different business is and the current business business inequality that receives of user.
12. a channel estimation methods in multicast multimedia service is characterized in that, the MBMS pilot frequency distribution of the neighbor cell in the same area has identical scrambler; In the time slot of MBMS traffic data channel, transmit pilot signal; This method comprises:
The MBMS business of determining described neighbor cell transmission is incomplete same;
After utilizing described MBMS pilot tone to carry out channel estimating, utilize described pilot signal that described channel estimating is revised.
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| CNA2007100075775A CN101242290A (en) | 2007-02-08 | 2007-02-08 | Descrambling allocation method and channel estimation method in multicast multimedia service |
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| CNA2007100075775A CN101242290A (en) | 2007-02-08 | 2007-02-08 | Descrambling allocation method and channel estimation method in multicast multimedia service |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101478799B (en) * | 2009-02-05 | 2012-12-19 | 中兴通讯股份有限公司 | Signal coverage method, CDMA access wireless cellular communication system |
| US9930672B2 (en) | 2013-05-17 | 2018-03-27 | Huawei Technologies Co., Ltd. | Service data scrambling method, service data descrambling method, apparatus and system |
-
2007
- 2007-02-08 CN CNA2007100075775A patent/CN101242290A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101478799B (en) * | 2009-02-05 | 2012-12-19 | 中兴通讯股份有限公司 | Signal coverage method, CDMA access wireless cellular communication system |
| US9930672B2 (en) | 2013-05-17 | 2018-03-27 | Huawei Technologies Co., Ltd. | Service data scrambling method, service data descrambling method, apparatus and system |
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Open date: 20080813 |