CN101785208A - Reduced interference in an mbms enabled system - Google Patents
Reduced interference in an mbms enabled system Download PDFInfo
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- CN101785208A CN101785208A CN200880104422A CN200880104422A CN101785208A CN 101785208 A CN101785208 A CN 101785208A CN 200880104422 A CN200880104422 A CN 200880104422A CN 200880104422 A CN200880104422 A CN 200880104422A CN 101785208 A CN101785208 A CN 101785208A
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Abstract
The invention discloses a method for a cellular system (100) which uses TD- SCDMA, Time Division Synchronous Code Division Multiple Access. According to the method, MBMS services, Multi media Broadcast Multicast Service, are enabled in a first (120) and a second (160) cell in the system, so that there can be both MBMS and non-MBMS users (130,170; 140; 180) in said first and second cells at one and the same time. According to the method, traffic to non-MBMS users (140, 180) in the first and second cells is sent using one and the same basic midamble code per cell which is shifted between the different non-MBMS users in each cell, and the traffic to MBMS users (130, 170) in both of said first and second cells who use the same MBMS services is varied between the cells with respect to the basic midamble code or/and the midamble shift.
Description
Technical field
The invention discloses a kind of method of in the TD-SCDMA system that enables the MBMS service, using.
Background technology
In cellular radio TD-SCDMA system, that is, use in the system of TD SDMA, different so-called scramblers and basic midamble sign indicating number are used to neighbor cell in the system to reduce presence of intercell interference.
In addition, use the distinctive so-called midamble of user to be shifted and make different user can discern the flow that they want, and make the user can carry out so-called channel estimating.Yet, for the system that uses so-called MBMS service, same basic midamble sign indicating number is used to all sub-districts that the carrying same MBMS is served in identical time slot and frequency in the system with same midamble displacement, wherein MBMS is meant multimedia broadcast multicast, and is a kind of or be about to by the standardized feature of CCSA (CCSA).Like this, the MBMS user in the system just can carry out so-called " soft combination " to the signal that is received from least one sub-district to improve SNR (signal to noise ratio of MBMS signal).
As for the MBSFN time slot, that is, the MBMS on the single-frequency has only single midamble and it to obtain from single basic midamble sign indicating number (it is distinctive to need not to be the sub-district).
European patent application EP 1727297 discloses a kind of method that reduces presence of intercell interference in communication system.In order to use disclosed method in the document, user terminal need be equipped with at least two antennas and come received signal.
European patent application EP 1793518 discloses a kind of method that multi-plot joint detects (jointdetection) that is used for.
Summary of the invention
One of purpose of the present invention is to provide a kind of improvement of above-mentioned TD-SCDMA MBMS technology.
Realize this purpose by a kind of method of in the cellular communication system of using TD-SCDMA (TD SDMA) principle, using that the invention discloses, in this system, at least in first sub-district of this system and second sub-district, enable MBMS service (that is multimedia broadcast multicast service).
Therefore, in the applied system of the present invention,, can there be MBMS user and non-MBMS user simultaneously in first sub-district and second sub-district at synchronization.
According to the present invention, use same basic midamble sign indicating number to send the flow of going to the non-MBMS user in first sub-district and second sub-district at each sub-district, displacement to some extent between the different non-MBMS user of this basic midamble sign indicating number in each sub-district, and the flow of going to the MBMS user who in described first sub-district and second sub-district, all uses same MBMS service with respect to this basic midamble sign indicating number or/and the midamble displacement between the sub-district, change to some extent.
Like this, the MBMS user in the sub-district still can receive identical MBMS signal from its " oneself " sub-district and from neighbor cell, but can distinguish the signal from different districts.If the signal from different districts is made up, will make the user can obtain higher what is called " portfolio premium " by so-called " soft combination ".
Suitable is, in an embodiment of the invention, the different districts that has carried the same MBMS signal in identical time slot and frequency is used same basic midamble sign indicating number but different midamble displacements, promptly, in this embodiment, midamble displacement be change and midamble remains unchanged.
Same suitable is, the midamble displacement is such, that is, the midamble sign indicating number is periodically displacement between the sub-district.
These and other execution mode of the present invention will be described in following specific description in more detail.
The invention also discloses a kind of control station that is used for the sub-district of honeycomb TD-SCDMA MBMS system.
Description of drawings
Below with reference to accompanying drawings the present invention is described in more detail, wherein:
Fig. 1 shows the general view of the system that the present invention can use,
Fig. 2 shows problem solved by the invention,
Fig. 3 shows method flow diagram of the present invention, and
Fig. 4 is the block diagram of transceiver of the present invention.
Embodiment
Fig. 1 is the schematic diagram of the present invention system 100 that can use.This system 100 has used the system of so-called TD SCDMA (TD SDMA) principle.In addition, this system supports so-called MBMS service (multimedia broadcast multicast service), and the MBMS service is the main principle of using in the system that moves according to the principle of being created by CCSA (CCSA) at present.
As shown in Figure 1, system 100 can comprise some sub-districts, and two sub-districts 120 and 160 wherein have been shown among Fig. 1.Each sub-district 120,160 can comprise some user UE (subscriber equipment), and Fig. 1 shows two UE 130,140 in each sub-district 120,160; 170,180.All there is a Control Node each sub-district, so-called NodeB, and it is used for going to and controlling from the user's of this sub-district flow.
In Fig. 1 by with the sub-district in the adjacent text MBMS of UE or the mode of NMNBS (non-MBMS) indicate the situation that enables the MBMS service in this system.
In system 100, the NodeB in this system can use the displacement of various so-called midamble sign indicating numbers and these midamble sign indicating numbers, i.e. " midamble displacement ".At present, for the MBMS service, an above NodeB in this system has used the identical midamble sign indicating number that identical midamble displacement is arranged.
Fig. 2 shows current intersystem problem: as shown in the figure, signal from two NodeB 110 shown in Figure 1 and 150 may arrive same UE, such as the UE 130 of sub-district 120, and these signals in fact may arrive this UE by mulitpath owing to multipath transmisstion.Some of multipath transmisstion path may be represented as P1-P4 by example in Fig. 2.
Can see that length is identical in fact if P2 is with P4, UE130 can not distinguish the signal from two NodeB so, because these two NodeB have used identical midamble sign indicating number and identical midamble displacement.Such as, want to use so-called CIR (channel impulse response) at UE, perhaps UE wants to use under the situation of the what is called " soft combination " to the signal that is received from a plurality of NodeB, and this will be disadvantageous, because " soft combination " must know which signal source is from which NodeB.This problem is for remarkable especially such as the MBMS user of UE130.
CIR is by the estimation of the midamble (midamble) in detection midamble (training sequence) or the TD system to receive channel.Receiver can be found out the phase place and the amplitude information of received signal from channel estimating, and uses this information to detect data better.
The problem of presence of intercell interference, the problem that is caused by as shown in Figure 2 multipath transmisstion particularly, the flow of the MBMS user by using the same MBMS service in the different districts of the system that goes to proposed by the invention change between the sub-district with respect to midamble or midamble displacement and are resolved.If so a kind of variation is arranged, then UE 130 still can be from NodeB 130,150 received signals, but can distinguish these signals, therefore can carry out CIR and/or soft combination.
Preferably, the variation of MBMS signal is for the midamble displacement, that is, therefore identical midamble is used to go to the user's who uses the same MBMS service in the different districts flow, but midamble promptly produces displacement between the NodeB of these sub-districts between different districts.Yet, further preferably between the sub-district, so change midamble.When all having disposed MBMS for each sub-district in the system, should be NodeB and dispose basic midamble and displacement thereof, make identical displacement do not used, at least not in " receiving range " each other by two NodeB.
In a preferred implementation, in identical time slot and frequency, used same midamble in the different districts of carrying same MBMS signal with different midamble displacements.
Can set forth the notion of same MBMS signal by following example: suppose NodeB broadcasting TV channel 11,2,3, No. 4, and 5,6,7, No. 8 NodeB broadcasting TV channels 2; The variation of midamble or midamble displacement should be arranged between the NodeB of the NodeB of these broadcast channels 1 and broadcast channel 2 so.
Preferably, if employed principle is the midamble displacement, this displacement will circulate between the sub-district and carry out so.
The user's who how to send the same MBMS service of going in first sub-district and second sub-district flow has been described above.Non-MBMS user's topic in the sub-district of the applied system of relevant the present invention, can be as described below: use same midamble sign indicating number for each sub-district and send the flow of going to the non-MBMS user in first sub-district and second sub-district, produce displacement between the different non-MBMS user of this midamble sign indicating number in the sub-district.
Therefore, by the present invention, the user can be not only receives same MBMS signal and these signals was carried out soft combination from their " oneself " sub-district but also from least one peripheral cell.In addition, will can distinguish owing to different midamble displacements from the MBMS signal of peripheral cell, this will make that user's channel estimating is more stable.
Fig. 3 shows the flow chart of method 300 of the present invention.Optionally step or alternative steps are shown by dashed lines in Fig. 3.
As mentioned above, method 300 is to use in the cellular communication system of using (step 305) TD-SCDMA principle (TD SDMA).
According to method 300, enable (step 310) MBMS service (multimedia broadcast multicast service) at least in the first sub-district in system and second sub-district, therefore, in step 315, at synchronization, may there be MBMS and non-MBMS user simultaneously in first sub-district and second sub-district.
In addition, according to method 300, in step 320, use same basic midamble sign indicating number to send the flow of going to the non-MBMS user in first sub-district and second sub-district at each sub-district, this basic midamble sign indicating number is displacement to some extent between the different non-MBMS user of each sub-district, and, go to flow change to some extent between the sub-district or/and midamble is shifted of the MBMS user who uses the same MBMS service in described first sub-district and second sub-district with respect to basic midamble sign indicating number in step 325.
In one embodiment, shown in step 330,, used identical basic midamble but different midamble displacements for the signal in the different districts of carrying same MBMS signal in identical time slot and frequency.
In another embodiment, step 335, basic midamble sign indicating number cyclic shift between the sub-district.
The invention also discloses a kind of cellular communication system of application TD-SCDM (TD SDMA) principle.
Fig. 4 shows the schematic diagram of system 400.The numbering of the parts in the system 400 of Fig. 4 is corresponding to the numbering among Fig. 1.
Therefore, system 400 is cellular communication systems of a kind of application TD-SCDMA (TD SDMA) principle, and system 400 comprises at least the first sub-district (120) and second sub-district (160).
Each sub-district 120,160 and NodeB 110 in the system 400; 150 are associated, and all enable MBMS service (multimedia broadcast multicast service) in first sub-district and second sub-district." association " speech is used to describe the relation between sub-district and the NodeB herein, and the NodeB that indicates two sub-districts may be same physical location in some applications, though two different districts of its service.
As shown in Figure 4, in system 400, use identical basic midamble sign indicating number to send the non-MBMS user's 140,180 who goes in first sub-district and second sub-district flow in each sub-district, be shifted to some extent between the different non-MBMS user of this basic midamble sign indicating number in each sub-district.
According to the present invention, in system 400, go to flow change to some extent between the sub-district or/and midamble is shifted of the MBMS user 130,170 who in described first sub-district and second sub-district, all uses the same MBMS service with respect to basic midamble sign indicating number.This indicates by " MBMS arrow " in the sub-district 160, and sub-district 160 uses text MBMS ' to describe, and this is relative with text MBMS in the sub-district 120.
In a version of system 400,, use identical basic midamble sign indicating number but different midamble displacements for first sub-district 120 of carrying same MBMS signal and the signal in second sub-district 160 in identical time slot and frequency.
In an execution mode of system 400, basic midamble sign indicating number cyclic shift between first sub-district and second sub-district.
The present invention not only is confined to embodiment described above and shown in FIG., but can freely change within the scope of the appended claims.
Claims (6)
1. one kind is the method for using in the cellular communication system (100) of " TD SDMA " principle (300) adopting (305) TD-SCDMA, according to this method, at least enable (310) MBMS service i.e. " multimedia broadcast multicast service " in first sub-district (120) in this system and second sub-district (160), make (315) at synchronization, can there be MBMS and non-MBMS user (130,170 simultaneously in described first sub-district and described second sub-district; 140; 180), and according to this method, each sub-district uses same basic midamble sign indicating number to send the non-MBMS user (140 who goes in described first sub-district and described second sub-district, 180) flow, displacement to some extent between the different non-MBMS user of described basic midamble sign indicating number in each sub-district, the method is characterized in that: it is different or/and described midamble is shifted with respect to described basic midamble sign indicating number between each sub-district that (325) go to the MBMS user's (130,170) who all uses the same MBMS service in described first sub-district and described second sub-district flow.
2. method according to claim 1 (300,330) wherein, has been used identical basic midamble sign indicating number but different midamble displacements for the signal in the different districts of carrying same MBMS signal in identical time slot and frequency.
3. method according to claim 1 and 2 (300,335), wherein, described basic midamble sign indicating number cyclic shift between described sub-district.
4. one kind is used the i.e. cellular communication system (400) of " TD SDMA " principle of TD-SCDMA, and this system comprises at least the first sub-district (120) and second sub-district (160), each sub-district all with NodeB (110; 150) be associated, and in this system, all enabled MBMS service i.e. " multimedia broadcast multicast service " in described first sub-district (120) and described second sub-district (160), in this system, each sub-district uses same basic midamble sign indicating number to send the non-MBMS user (140 who goes in described first sub-district and described second sub-district, 180) flow, displacement to some extent between the different non-MBMS user of described basic midamble sign indicating number in each sub-district, this system (400) is characterised in that: the flow that (325) go to the MBMS user (130,170) who uses the same MBMS service in described first sub-district and described second sub-district in the two between described sub-district with respect to described basic midamble sign indicating number or/and described midamble displacement and changing.
5. system according to claim 4 (400), wherein, and the signal in described second sub-district (160) has used identical basic midamble sign indicating number but different midamble is shifted for described first sub-district (120) of carrying same MBMS signal in identical time slot and frequency.
6. according to claim 4 or 5 described systems (400), wherein, described basic midamble sign indicating number is cyclic shift between described first sub-district and described second sub-district.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE0702080 | 2007-09-18 | ||
| SE0702080-3 | 2007-09-18 | ||
| PCT/SE2008/051023 WO2009038528A2 (en) | 2007-09-18 | 2008-09-12 | Reduced interference in an mbms enabled system |
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| Publication Number | Publication Date |
|---|---|
| CN101785208A true CN101785208A (en) | 2010-07-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200880104422A Pending CN101785208A (en) | 2007-09-18 | 2008-09-12 | Reduced interference in an mbms enabled system |
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| CN (1) | CN101785208A (en) |
| WO (1) | WO2009038528A2 (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1533191A (en) * | 2003-03-21 | 2004-09-29 | 乐金电子(中国)研究开发中心有限公司 | Adaptive channel evaluating method and device based on expected medium code of construction |
| EP1487165A1 (en) * | 2003-06-14 | 2004-12-15 | Lg Electronics Inc. | TD-SCDMA channel estimation method and apparatus |
| CN1829206A (en) * | 2005-12-19 | 2006-09-06 | 北京邮电大学 | A channel estimation method for TD-SCDMA system |
| US20070135153A1 (en) * | 2005-12-12 | 2007-06-14 | Zhijun Cai | Methods and apparatus for providing a transmit signal strength message |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FI108178B (en) * | 1997-12-16 | 2001-11-30 | Nokia Networks Oy | Increasing the capacity of a data communications network |
| CN100401646C (en) * | 2004-09-24 | 2008-07-09 | 大唐移动通信设备有限公司 | Multi region combined detection method of time gap code division multi address system |
| US8045599B2 (en) * | 2005-02-17 | 2011-10-25 | Sony Corporation | Selection of training sequences for multiple-in multiple-out transmissions |
| EP1727297A1 (en) * | 2005-05-25 | 2006-11-29 | Siemens Aktiengesellschaft | Method and Terminal for reducing interference in a radio communication system |
-
2008
- 2008-09-12 WO PCT/SE2008/051023 patent/WO2009038528A2/en active Application Filing
- 2008-09-12 CN CN200880104422A patent/CN101785208A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1533191A (en) * | 2003-03-21 | 2004-09-29 | 乐金电子(中国)研究开发中心有限公司 | Adaptive channel evaluating method and device based on expected medium code of construction |
| EP1487165A1 (en) * | 2003-06-14 | 2004-12-15 | Lg Electronics Inc. | TD-SCDMA channel estimation method and apparatus |
| US20070135153A1 (en) * | 2005-12-12 | 2007-06-14 | Zhijun Cai | Methods and apparatus for providing a transmit signal strength message |
| CN1829206A (en) * | 2005-12-19 | 2006-09-06 | 北京邮电大学 | A channel estimation method for TD-SCDMA system |
Non-Patent Citations (1)
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| ITU-R AD HOC: "Reply LS on the material to be submitted to ITU-RWP8F#14 for Revision 5 of recommendation ITU-RM.1457", 《3GPP TSG RAN MEETING #25，RP-040357》 * |
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| Publication number | Publication date |
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| WO2009038528A2 (en) | 2009-03-26 |
| WO2009038528A3 (en) | 2009-07-16 |
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Application publication date: 20100721 |