CN101785207A - A method and a device for reduced inter-cell interference - Google Patents
A method and a device for reduced inter-cell interference Download PDFInfo
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- CN101785207A CN101785207A CN200880103974A CN200880103974A CN101785207A CN 101785207 A CN101785207 A CN 101785207A CN 200880103974 A CN200880103974 A CN 200880103974A CN 200880103974 A CN200880103974 A CN 200880103974A CN 101785207 A CN101785207 A CN 101785207A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
- H04J11/0023—Interference mitigation or co-ordination
- H04J11/005—Interference mitigation or co-ordination of intercell interference
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/707—Spread spectrum techniques using direct sequence modulation
- H04B1/7097—Interference-related aspects
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B2201/00—Indexing scheme relating to details of transmission systems not covered by a single group of H04B3/00 - H04B13/00
- H04B2201/69—Orthogonal indexing scheme relating to spread spectrum techniques in general
- H04B2201/707—Orthogonal indexing scheme relating to spread spectrum techniques in general relating to direct sequence modulation
- H04B2201/70702—Intercell-related aspects
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Abstract
The invention discloses a method (400) for use in a cellular telecommunications system (100), which system comprises a number of cells (130), in each of which there can be a first (110) and a second (120) transceiver between which traffic can be exchanged, and in which system (100) scrambling codes are used for said traffic. The traffic can comprise at least a first and a second type of services, and a first group of scrambling codes with a first scrambling code length (S1-S16) is used for said first type of services and a second group of scrambling codes with a second scrambling code length (S1-S32) beingused in a plurality of adjoining cells for said second type of services.
Description
Technical field
The present invention has disclosed a kind of method of using in cellular communication system, this cellular communication system comprises a plurality of sub-districts, and in these sub-districts each all have mutually can the switched communication amount first transceiver and second transceiver.The traffic between the transceiver can comprise professional and second type service of the first kind at least.
Background technology
In cellular communication system,, in adjacent sub-district, use different scramblers and basic training sequence code sometimes in order to reduce the interference of minizone such as TD-SCDMA (TD SDMA) system.
Yet, for as standardization in CCSA (CCSA) or MBMS (multimedia broadcast multi-broadcasting business) that will standardized business, use same specific scramble codes and basic training sequences sign indicating number for the sub-district of one group of adjacency, identical MBMS business has been carried in the sub-district of this group adjacency in same time slot/frequency, and uses same spreading code.Like this, the user in the sub-district can receive the MBMS signal from all sub-districts on every side, and uses these signals that receive to carry out so-called soft combination.
As among the MBMS, in the sub-district of adjacency, using the problem of the principle of identical scrambler to be, may cause interference in some cases to the user.
Summary of the invention
Therefore, as implied above, need a solution, can utilize this solution to alleviate or eliminate interference problem in the present TD-SCDMA MBMS system fully.
The invention provides such solution, in the present invention, disclose a kind of method of in cellular communication system, using.
Can use system of the present invention and comprise a plurality of sub-districts, in each sub-district, all have first transceiver and second transceiver.Can be between these two transceivers the switched communication amount, use so-called scrambler for the described traffic.The described traffic can comprise professional and second type service of the first kind at least, and the method according to this invention, for the professional first group of scrambler that use of the described first kind, and use second group of scrambler that in a plurality of abutting subdistricts, use, that have the second scrambler length for described second type service with first scrambler length.
Thereby, by the present invention, can come the length of " customization " scrambler at specific business, as illustrating in further detail in the following detailed description, can utilize this to reduce or eliminate the presence of intercell interference in the MBMS application in the TD SCDMA system for example.
Suitably, the length that is shorter in length than described second scrambler of described first scrambler.A kind of selection that can realize the length of described second scrambler of being shorter in length than of described first scrambler is two or more sign indicating numbers in making up described first group.
Used in the system of the present invention, receive the transceiver of the traffic of described second type from described second transceiver, also can receive the corresponding traffic from the transceiver of another sub-district.According to an embodiment of the invention, will cause still can causing disturbing according to the traffic to positive contribution from the signal of " oneself " sub-district from described another sub-district, described first transceiver can abandon the corresponding traffic from described another sub-district subsequently, and perhaps in the future the corresponding traffic of the transceiver of described another sub-district combines with the traffic from described second transceiver.
These and other advantage will become more obvious in the following detailed description.
Except method of the present invention, the present invention has also disclosed a kind of transceiver that has used in having used system of the present invention.
Description of drawings
Come to describe in further detail the present invention below with reference to accompanying drawings, in the accompanying drawings:
Fig. 1 shows the schematic diagram that can use system of the present invention, and
Fig. 2 show the present invention at problem, and
Fig. 3 shows first execution mode of the present invention, and
Fig. 4 shows the roughly flow chart of method of the present invention, and
Fig. 5 shows the schematic block diagram of transceiver of the present invention.
Embodiment
Fig. 1 shows the schematic diagram that can use system 100 of the present invention.As shown in Figure 1, system 100 comprises a plurality of so-called sub-districts, in Fig. 1 one of them sub-district is shown 130.Each such sub-district 130 can comprise a plurality of users, and the user also usually is called subscriber equipment " UE " sometimes.Figure 1 illustrates a UE 120.
The traffic from NodeB to UE is called as downlink traffic DL, and the traffic from UE to NodeB is called as uplink traffic UL.
Below, will use the term of TD-SCDMA MBMS system (TD SDMA multimedia broadcast multi-broadcasting business), with reference to the system among Fig. 1 100 the present invention is described.Yet this only is for the ease of reader understanding invention, should be appreciated that the present invention can be applied to use in a lot of systems with TD-SCDMA MBMS system same principle.
In the TD SCDMA system of MBMS business is not provided,, different so-called scramblers and basic training sequence code in adjacent sub-district, have been used in order to reduce the interference of minizone.Yet, in the system that the MBMS business is provided, at whole or a plurality of abutting subdistricts that the MBMS business is provided, in identical time slot and frequency, use a specific scrambler and a basic training sequence code, and use identical so-called spreading code (that is, be used to expand usable spectrum and be used to distinguish different user sign indicating number).
In the MBMS sub-district, use identical sign indicating number to be since expectation UE not only from the NodeB of the sub-district of " they ", but also from the NodeB of sub-district adjacent or adjacency, received signal (in identical time slot and frequency), this will make UE to carry out so-called " soft combination " to the received signal from different NodeB, will increase signal level like this.
Yet, use the problem that principle caused of same code as follows: more late than the time point that receives from the MBMS signal of another sub-district if UE receives from the time point of the MBMS signal of NodeB, and UE receives time difference between these two signals greater than the length of scrambler, and then the soft combination of these two signals will cause the signal level disturbing rather than increase.
In TD-SCDMA MBMS, use the scrambler of length with 16 chips.Therefore, if recently arrive UE above 16 chips evening from the MBMS signal that comprises identical data of another sub-district from the MBMS signal of a sub-district, this not only is not that positive contribution can cause destructive interference on the contrary.This illustrates in Fig. 2 in a simplified manner, and Fig. 2 shows the UE of the sub-district (" sub-district 2 ") that is arranged in the TD-SCDMAMBMS system and another is represented as the neighbor cell of sub-district 1.
DL signal from the NodeB of these two sub-districts is all received by the UE in the sub-district 2, as shown in Figure 2.Be represented as d1 from data these two NodeB, that should make up by soft combination in UE, send d1 in so-called CDMA " chip ", wherein each chip is all encoded with different scramblers.
Thereby, as shown in Figure 2, the MBMS chip sequence of d1 be d1s1, d1s2 ..., d1s16.As shown in Figure 2,, arrive this UE, and UE began from the sub-district 2 and received another data sequence d2 this moment from the data of the d1 of sub-district 1 after the UE place has received data sequence from the d1 of sub-district 2.The delay that MBMS signal from sub-district 1 and sub-district 2 shown in Figure 2 arrives between the UE is 16 chips or bigger, and in other words, postponing is the length of employed scrambler in system at least.
Be appreciated that if UE begins to carry out the soft combination of data sequence d1 and d2 this not only is not constructively only can cause destructive interference on the contrary.Certainly, the NodeB of sub-district 1 (promptly, the adjacent NodeB that produce to disturb) in most of the cases will be more farther apart from UE than the NodeB of UE " oneself " sub-district, this will cause the signal strength signal intensity of interference signal at the UE place to be lower than intensity from the signal of UE " oneself " NodeB, may remain a plurality of sub-districts encirclement that a problem, particularly UE may be had interference NodeB but disturb.
The present invention is devoted to solve aforesaid and problem shown in figure 2.Below the present invention will be described in further detail, but basic principle of the present invention is: at the TD-SCDMA MBMS traffic, will use such scrambler, promptly, this scrambler on length be used for the scrambler difference of other traffic (that is " non-MBMS " traffic) of sub-district.
Suitably, as what show from top description, the length of scrambler that is used for the non-MBMS traffic is shorter than the length of the scrambler that is used for the MBMS traffic, therefore the influence that postpones will be not can be as shown in Figure 2 so serious.But general aspect of the present invention is to use the scrambler with different length at the MBMS traffic and the non-MBMS traffic.
In preferred situation, that is, when the scrambler that is used for the MBMS traffic was longer than the scrambler that is used for the non-MBMS traffic, the length of the MBMS sign indicating number that is increased was to realize by two or more yards that are used for the non-MBMS traffic are made up.
Can also come illustration the present invention with reference to Fig. 3, Fig. 3 shows the essentially identical situation with Fig. 2, and different is is used for the MBMS traffic from the eNodeB of sub-district 1 and sub-district 2 with the scrambler of 32 chip lengths.Thereby, as shown in Figure 3, with data sequence d1 and d2 be encoded into d1s1, d1s2 ... d1s16 and d2s17 ... d2s32, wherein dn represents n data, and sn represents n chip of scrambler.
A kind of method that obtains the longer scrambler that is used for the MBMS traffic in the example shown in Fig. 3 is that two to the scrambler that is used for the non-MBMS traffic make up.Under these circumstances, for example will be by making d1 use scrambler 0 and making d2 use scrambler 1, d3 uses scrambler 0, and d4 uses scrambler 1 etc., makes up two the 16 long scramblers of chip.
As can be seen, the 1 and 2 MBMS data that receive are simultaneously compared with (that is, shown in Figure 1) before and will be caused obviously lower annoyance level from the sub-district from example shown in Figure 3.
In one aspect of the invention, from two sub-districts (promptly, NodeB from two sub-districts) UE that receives the MBMS traffic can select the MBMS traffic from two sub-districts is made up, perhaps abandon the MBMS traffic from one of them sub-district, suitable is does not abandon the MBMS traffic from " oneself " sub-district.Can use multiple mode to make this selection, for example, UE can be by determining whether to receive the MBMS traffic from two sources, and determine that subsequently whether soft combination can cause positive result, comes " preliminary treatment " such traffic.
In the example of Fig. 3, used the long sign indicating number of 32 chips for the MBMS traffic.But if according to the present invention, the sign indicating number that is used for the MBMS traffic is than the code length that is used for the non-MBMS traffic, and the sign indicating number that then has a random length that surpasses 16 chips all within the scope of the invention.
Fig. 4 shows the roughly flow chart of method 400 of the present invention.Step as option or alternative example is shown in broken lines.As what from top description, manifest, method 400 of the present invention is intended to be used for the cellular communication system of system 100 as shown in Figure 1, that is, comprise the system of a plurality of sub-districts 130, wherein each sub-district all have mutually can the switched communication amount first transceiver 110 and second transceiver 120.
In the system that has used method 100 of the present invention, use scrambler for the traffic, and the traffic can comprise professional and second type service of the first kind at least.
Shown in step 405 and step 410, use first group of scrambler for the first kind is professional, and used the second group of scrambler that in the sub-district of a plurality of adjacency, uses, have the second scrambler length (in Fig. 3, being illustrated as S1-S32) for second type service with first scrambler length (in Fig. 2, being illustrated as S1-S16).
Shown in step 415, in one aspect of the invention, first scrambler is shorter in length than the second scrambler length.
As shown in step 430, in one aspect of the invention, the first scrambler length of first group of scrambler is 16 or littler, and the second scrambler length of second group of scrambler is longer than 16.
As what from top description, manifest, the method according to this invention, second transceiver is the Control Node 110 of sub-district 130, the function that it had is to going to and controlling from the user in the sub-district 120 the traffic, and described first transceiver 120 is the users in the sub-district, therefore the method have been applied to the down link direction DL in the sub-district.
If apply the present invention to TD-SCDMA MBMS system, then shown in step 440 and step 445, second transceiver is the NodeB of TD-SCDMA MBMS system, and first transceiver is the UE of this system.
The invention also discloses first and second transceivers that in having used system of the present invention, used, that is, and NodeB and UE.Because the similitude of the foundation structure between these two kinds of transceivers illustrates and has described this two kinds of transceivers with reference to Fig. 5.
Thereby Fig. 5 shows the schematic block diagram of employed transceiver 500 in having used system of the present invention.As shown in Figure 5, transceiver 500 will comprise the antenna that is illustrated as piece 510, and will comprise acceptance division 520 and sending part 530.In addition, transceiver 500 also comprises control device 540 and the memory 550 such as microprocessor.In addition, be under the situation of NodeB at transceiver 500, transceiver 500 can also comprise the interface 560 of other assembly beyond the UE in the system-oriented.
As mentioned above, transceiver 500 is intended to be used in the cellular communication system as the system 100 of Fig. 1, that is, this system comprises a plurality of sub-districts 130, and has used scrambler for communication in this system 100.
The traffic in the system 100 can comprise professional and second type service of the first kind at least, and transceiver 500 is equipped with and is used for using first group of scrambler with first scrambler length and second type service being used the device of second group of scrambler with second scrambler length the first kind is professional, as controller 540 and memory 550.
In a concrete execution mode, transceiver 500 of the present invention uses first scrambler with length shorter than the length of second scrambler.
In another embodiment, transceiver 500 can use piece 540 and 550, to obtain the second scrambler length by two or more sign indicating numbers that make up in first group.
Suitably, in transceiver 500, the first scrambler length of first group of scrambler is 16 or littler, and the second scrambler length of second group of scrambler is greater than 16.
As mentioned above, in a form of execution mode, transceiver 500 is 110 such Control Node in as shown in Figure 1 the sub-district 130, and one of function that it has is to going to and controlling from the user in the sub-district 130 120 the traffic.
In another form of execution mode, transceiver 500 also can be such as 120 such user terminals in the sub-district 130.
If transceiver 500 is UE, then transceiver 500 can use antennas 510 jointly with receiver 520, come to receive the traffic of second type from the Control Node of its oneself sub-district, and receive the corresponding traffic from the Control Node of another sub-district, and transceiver 500 can use controller 540 to abandon the corresponding traffic from described another sub-district, perhaps to making up from the corresponding traffic of the transceiver of this another sub-district and the traffic from " oneself " Control Node.
In preferred embodiment, transceiver 500 is the transceivers in TD-SCDMA (TD SDMA) system, wherein, first kind business comprises voice and/or data traffic, and second type service comprises MBMS business (multimedia broadcast multi-broadcasting business).
The present invention is not limited to above-mentioned and the execution mode shown in the accompanying drawing, but can optionally change within the scope of the appended claims.
Claims (18)
1. method (400) of in cellular communication system (100), using, this system comprises a plurality of sub-districts (130), wherein each sub-district all has first transceiver (110) and second transceiver (120) of switched communication amount mutually, and in this system (100), use scrambler for the described traffic, the described traffic can comprise professional and second type service of the first kind at least, this method (400) is characterised in that (405,410): use first group of scrambler for described first kind business, and use the second group of scrambler that in a plurality of abutting subdistricts, uses with second scrambler length (S1-S32) for described second type service with first scrambler length (S1-S16).
2. method according to claim 1 (400,415), wherein, described first scrambler is shorter in length than the described second scrambler length.
3. method according to claim 1 and 2 (400,420), wherein, the described second scrambler length is to realize by two or more yards that make up in described first group.
4. according to any described method (400 in the claim 1 to 3,425), wherein, receive described second transceiver (120) of the traffic of described second type from described first transceiver (100) of described sub-district (100), can also receive the corresponding traffic from the transceiver of another sub-district, and wherein, described second transceiver can abandon the described corresponding traffic from described another sub-district, perhaps to making up from the described corresponding traffic of the described transceiver in described another sub-district and the described traffic from described first transceiver.
5. according to any described method of aforementioned claim (400,430), wherein, the described first scrambler length of described first group of scrambler is 16 or littler, and the described second scrambler length of described second group of scrambler is greater than 16.
6. according to any described method of aforementioned claim (400), wherein, the Control Node (100) that described first transceiver is sub-district (130), one of function that it had is to going to and control from the user's in this sub-district (120) the traffic, and described second transceiver (120) is the user in this sub-district.
7. according to any described method (400,435) in the claim 1 to 5, the method have been applied to TDS-CDMA system.
8. method (400 according to claim 6,435), the method have been applied to TDS-CDMA system, in this TDS-CDMA system, described first kind business comprises voice and/or data traffic, and described second type service comprises multimedia broadcast multi-broadcasting business.
9. according to claim 7 or 8 described methods (400,440,445), wherein, described first transceiver is the NodeB in the TD SDMA multimedia broadcast multi-broadcasting business system, and described second transceiver is the UE in this system.
10. a transceiver that in cellular communication system, uses (500), this system comprises a plurality of sub-districts (130), and in this system (100), use scrambler for the traffic, the described traffic can comprise professional and second type service of the first kind at least, described transceiver (500) is characterised in that, this transceiver (500) is equipped with and is used for the professional first group of scrambler with first scrambler length (S1-S16) that use of the described first kind, and described second type service is used the device (540,550) of second group of scrambler with second scrambler length (S1-S32).
11. transceiver according to claim 10 (500), this transceiver use first scrambler with length shorter than the described second scrambler length.
12. according to claim 10 or 11 described transceivers (500), this transceiver is equipped with and is used for the device (540,550) that obtains the described second scrambler length by two or more described first group yards are made up.
13. according to any described transceiver (500) in the claim 10 to 12, wherein, the described first scrambler length of described first group of scrambler is 16 or littler, and the described second scrambler length of described second group of scrambler is greater than 16.
14. according to any described transceiver (500) in the claim 10 to 13, this transceiver is the Control Node (100) of sub-district (130), one of function that it had is to going to and controlling from the user's in this sub-district (120) the traffic.
15. according to any described transceiver (500) in the claim 10 to 14, this transceiver is the user terminal (120) of sub-district (130).
16. transceiver according to claim 15 (500), this transceiver is equipped with the Control Node that is used for from the sub-district (100) to receive the traffic of described second type, and be used for receiving the device (510 of the corresponding traffic from the Control Node of another sub-district, 520), and this transceiver also is equipped with the described corresponding traffic that is used to abandon from described another sub-district, perhaps the device (540) to making up from the described corresponding traffic of the described transceiver of described another sub-district and the described traffic from described Control Node.
17. according to claim 15 or 16 described transceivers (500), this transceiver is the transceiver in the TDS-CDMA system.
18. transceiver according to claim 17 (500), in described TDS-CDMA system, described first kind business comprises voice and/or data traffic, and described second type service comprises multimedia broadcast multi-broadcasting business.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE0702081 | 2007-09-18 | ||
| SE0702081-1 | 2007-09-18 | ||
| PCT/SE2008/050121 WO2009038521A1 (en) | 2007-09-18 | 2008-01-31 | A method and a device for reduced inter-cell interference |
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| Publication Number | Publication Date |
|---|---|
| CN101785207A true CN101785207A (en) | 2010-07-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200880103974A Pending CN101785207A (en) | 2007-09-18 | 2008-01-31 | A method and a device for reduced inter-cell interference |
Country Status (2)
| Country | Link |
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| CN (1) | CN101785207A (en) |
| WO (1) | WO2009038521A1 (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1434589A (en) * | 2002-01-23 | 2003-08-06 | 华为技术有限公司 | Method for providing real time broadcasting service in mobile communication metwork |
| US6674790B1 (en) * | 2002-01-24 | 2004-01-06 | Meshnetworks, Inc. | System and method employing concatenated spreading sequences to provide data modulated spread signals having increased data rates with extended multi-path delay spread |
| CN1941687A (en) * | 2005-09-29 | 2007-04-04 | 华为技术有限公司 | Method for duplicating broadcasting service channel and non-broadcasting service channel |
| CN1972268A (en) * | 2005-11-25 | 2007-05-30 | 北京三星通信技术研究有限公司 | Method for adding scrambling code in OFDM-based system |
| CN101022595A (en) * | 2007-03-28 | 2007-08-22 | 中兴通讯股份有限公司 | Method for sending and receiving MBMS using single-slot network in TD-SCDMA |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1723629A (en) * | 2003-01-10 | 2006-01-18 | 美商内数位科技公司 | Generalized two-stage data estimation |
| US7738540B2 (en) * | 2004-09-28 | 2010-06-15 | Panasonic Corporation | Wireless transmission system, wireless station used therein and method used therefor |
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2008
- 2008-01-31 WO PCT/SE2008/050121 patent/WO2009038521A1/en active Application Filing
- 2008-01-31 CN CN200880103974A patent/CN101785207A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1434589A (en) * | 2002-01-23 | 2003-08-06 | 华为技术有限公司 | Method for providing real time broadcasting service in mobile communication metwork |
| US6674790B1 (en) * | 2002-01-24 | 2004-01-06 | Meshnetworks, Inc. | System and method employing concatenated spreading sequences to provide data modulated spread signals having increased data rates with extended multi-path delay spread |
| CN1941687A (en) * | 2005-09-29 | 2007-04-04 | 华为技术有限公司 | Method for duplicating broadcasting service channel and non-broadcasting service channel |
| CN1972268A (en) * | 2005-11-25 | 2007-05-30 | 北京三星通信技术研究有限公司 | Method for adding scrambling code in OFDM-based system |
| CN101022595A (en) * | 2007-03-28 | 2007-08-22 | 中兴通讯股份有限公司 | Method for sending and receiving MBMS using single-slot network in TD-SCDMA |
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| WO2009038521A1 (en) | 2009-03-26 |
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