CN100555903C - Utilize space diversity receiving method to improve the method for multimedia broadcast multi-broadcasting business service performance - Google Patents
Utilize space diversity receiving method to improve the method for multimedia broadcast multi-broadcasting business service performance Download PDFInfo
- Publication number
- CN100555903C CN100555903C CNB2005101074183A CN200510107418A CN100555903C CN 100555903 C CN100555903 C CN 100555903C CN B2005101074183 A CNB2005101074183 A CN B2005101074183A CN 200510107418 A CN200510107418 A CN 200510107418A CN 100555903 C CN100555903 C CN 100555903C
- Authority
- CN
- China
- Prior art keywords
- business
- burst
- sub
- mbms
- space diversity
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
- H04W84/04—Large scale networks; Deep hierarchical networks
- H04W84/08—Trunked mobile radio systems
Abstract
The present invention relates to a kind ofly can increase the Service coverage of cluster broadcasting and reduce to transmit the method for disturbing on the resource of described cluster broadcasting service, and it mainly may further comprise the steps: whether the business that (1) is judged on the current time slots and transmitted is cluster broadcasting service; (2) after judging that the business of being transmitted on the current time slots is cluster broadcasting service, transmitting terminal distributes identical scrambler or the not processing of scrambled code to the data division of this cluster broadcasting service burst, and the burst after the identical slot transmission in network is handled subsequently; (3) receiving terminal uses training sequence to receive and merges burst.By adopting space diversity method of the present invention can improve spectrum efficiency, avoid sub-district phase mutual interference, improve the decoded signal quality, increase coverage and reduce required website laying quantity.
Description
Technical field
The present invention relates to a kind of wireless communication technology, more specifically to a kind of method of in wireless communication system, utilizing space diversity receiving method to improve the multimedia broadcast multi-broadcasting business service performance.
Background technology
Along with the fast development of mobile communication technology, cluster broadcasting service the business that more and more attracts people's attention appearred, for example.As most representative a kind of business wherein, multimedia broadcast multi-broadcasting business (Multimedia Broadcasting MulticastService, MBMS sees 3G (Third Generation) Moblie standard 3GPP TR25.803 for details) because its unique glamour causes the concern of industry more and more.The MBMS business has following characteristics: (1) service needed covers whole sub-district as much as possible, and (2) same business is broadcast on certain zone of network, and is higher as (3) message transmission rate on a plurality of neighbor cells.
And according to present standard, the MBMS business be can't help to be mapped in the BCCH carrying on the Common Control Channel PCCPCH by auxiliary Common Control Channel (SCCPCH) carrying.Although the BCCH channel has the similar characteristic of SCCPCH channel to carrying MBMS business, in BCCH channel on bearing system information.The data rate of BCCH channel only is 12.3kbps, and it is far smaller than the professional desired data rate (64kbps is to 256kbps) of MBMS.The signal that high data rate need receive has high carrier/interface ratio.Therefore, because the restriction of down link (DL) through-put power, the coverage of MBMS business will be far smaller than the coverage of BCCH channel, and the MBMS data rate is high more, and the coverage of MBMS business is just more little.This means apart from the base station certain distance but still the many users within BCCH channel coverage can not use the MBMS business, unless even operator dwindles the scope of sub-district to guarantee still can to obtain the MBMS business at cell edge.But this method can increase network operation cost, and strengthening fund input and expense increases.
The known merging unrelated signal that can pass through obtains diversity gain.Because the described high rate services that is provided is identical, therefore can enlarge service coverage area by the signal that merges from adjacent cell for user near cell boarder in contiguous sub-district.Begin to use some deversity schemes (space, time, frequency diversity) at present and increased the overlay area.
Illustrated among Fig. 1 according to prior art and on subscriber equipment, carried out the schematic diagram that signal merges.The antenna of subscriber equipment receives the signal of different districts, passes to diversity receiver, carries out channel-decoding then, then carries out process encoding based on check code (CRC) and sequence number, passes to application layer at last and carries out conventional treatment.
In WCDMA, use grand diversity to increase coverage, promptly terminal is established to the link of some Node B and merges burst from the high rate services of each Cell Broadcast CB identical content of above-mentioned Node B.And in TDD mode (TDD) system, also use similar macro diversity method, this grand method merges the signal from the different districts that is in different time-gap.For example the high rate services of each Cell Broadcast CB identical content is transmitted at TS4 (time slot 4) in sub-district 1, and the high rate services of each Cell Broadcast CB identical content is transmitted in sub-district 2 at TS6.Terminal receives the high rate services burst of each the Cell Broadcast CB identical content among TS4 and the TS6 and it is merged in same frame.After merging, just produced the diversity gain of space and/or time-domain.The diversity of spatial domain is to obtain gain by the signal that merges in the different propagation paths.The time-domain diversity uses the signal in the different time transmission to have irrelevant transmission characteristic this characteristic that for example declines, by being incorporated in signal that different time-gap receives to obtain gain.Because other sub-districts transmit Traffic Channel (TCH) with above-mentioned sub-district on same time slot, the TCH in time slot and the high rate services of each Cell Broadcast CB identical content are with mutual interference mutually.
Another kind method uses frequency domain and time domain to obtain gain, and promptly different sub-districts is in the same cluster broadcasting service burst of different carrier frequencies and different slot transmission.User terminal merges the cluster broadcasting service burst from different carrier frequencies and time slot.This will reduce spectrum efficiency, because need keep a plurality of bursts for same cluster broadcasting service piece.Same TCH and the cluster broadcasting service that transmits in adjacent cell will interfere with each other.
Summary of the invention
The object of the present invention is to provide a kind of can be under the prerequisite that does not increase scrap build, thereby the influence that reduces the suffered interference of cluster broadcasting service increases the method for cluster broadcasting service coverage.
According to the present invention, a kind of method of utilizing space diversity receiving method to improve the multimedia broadcast multi-broadcasting business service performance is provided, may further comprise the steps:
Whether the business of (1) judging on the current time slots to be transmitted is multimedia broadcast multicast (MBMS) business;
(2) after judging that the business of being transmitted on the current time slots is the MBMS business, transmitting terminal distributes identical scrambler or the not processing of scrambled code to the data division of this MBMS business burst;
(3) burst after the transmitting terminal identical slot transmission processing in network subsequently;
(4) receiving terminal uses training sequence to carry out channel estimating then, and receives and the merging burst, thereby obtains space diversity gain.
According to an aspect of the present invention, each sub-district uses different propaedeutics sign indicating numbers to carry out channel estimating.
According to another aspect of the present invention, each sub-district uses identical midamble code, still different training skews to carry out channel estimating.
According to also aspect of the present invention, all the sub-district uses identical propaedeutics sign indicating number to carry out channel estimating.
In the present invention, if the judgement business is not the MBMS business, then carry out conventional Business Processing.
In the present invention, each sub-district use identical midamble code, but when channel estimating was carried out in different training skew, receiving terminal adopted a kind of in the maximum ratio method of merginging, selection merging method or the equal gain combining method that described burst is combined.
The present invention is based on signal checking sign indicating number and sequence number and the burst of different frequency is merged processing at wireless chain control layer.
The present invention also comprises the step of the MBMS business burst that receives being carried out channel-decoding.
By adopting space diversity method of the present invention can improve spectrum efficiency, avoid sub-district phase mutual interference, improve the decoded signal quality, increase coverage and reduce required website laying quantity.
Description of drawings
Below in conjunction with accompanying drawing the specific embodiment of the present invention is described in further detail, wherein:
Fig. 1 carries out the schematic diagram that the diversity reception signal merges according to prior art on user terminal;
Fig. 2 is a schematic flow sheet of the method according to this invention.
Embodiment
Multimedia broadcast multi-broadcasting business (MBMS) is a kind of typical cluster broadcasting service.For the sake of clarity, following the present invention specifically is described at the MBMS business, but be appreciated that, any business with cluster broadcast characteristic all can adopt technical scheme of the present invention, as long as it has the characteristics in different Cell Broadcast CB identical services, all can use technical scheme of the present invention.
When using the method for the invention that the coverage of MBMS business is expanded, whether the business that at first needs to judge on the current time slots and transmitted is the MSMS service.If not the MBMS business, then carry out conventional Business Processing.
After judging that the business of being transmitted on the current time slots is the MBMS service, according to a kind of situation of the present invention, transmitting terminal distributes identical scrambler to the data division of MBMS burst, and the burst after the identical slot transmission scrambling in network subsequently.
In above-mentioned whole sub-districts is that MBMS service is used in the processing scheme of same fixedly time slot and same scrambler, and the data division of the MBMS burst of broadcasting in the whole network is exactly on all four.This will bring following two benefits: first, on this time slot, will can not go out presence of intercell interference again, from the whole MBMS burst of whole adjacent cells at one time window arrive the antenna of target terminal user, be taken as additional multipath signal on the multipath signal in Target cell from the signal of adjacent cell.
The second, from the decay path difference that the MBMS burst of different districts is experienced, therefore can also automatically carry out space diversity.If all be in from the path of Target cell very strong on the downside, and from the not decline of path of adjacent cell, recipient's MBMS information in the burst that has more weak decline of can also decoding then.
According to another kind of situation of the present invention, also can not happen suddenly and do any scrambling/scramble process MBMS.This will reduce the computation burden of making a start with receiving end simultaneously, but may cause that the receiving end/receiver of making a start all becomes complicated slightly.
Distribute identical scrambler as for selecting, still not distribute scrambler, this depends on the complexity when carrying out flow scheme design and software design, and the corresponding work amount, also has the configuring condition of system.
After transmitting terminal was finished the scrambler processing, according to the present invention, receiving terminal can carry out corresponding system handles according to above-mentioned disposition, improves the space diversity gain of signal.
In the present invention, thereby receiving terminal uses training sequence to carry out the channel estimating reception and merges burst, thus the space diversity gain of picked up signal.Because it is different being used for the propaedeutics sign indicating number of channel estimating usually in the different districts, can adopt following three kinds of schemes to solve channel estimation problems:
Scheme 1: as usual, different propaedeutics sign indicating numbers is used in each sub-district.For this reason, the terminal in Target cell will use the midamble code of appointment to carry out channel estimating.By carrying out described channel estimating, only the multipath between target terminal and target node b can be estimated, can not use from other sub-districts the path, therefore can suitably reduce the interference of each minizone, thereby obtain space diversity gain.
Scheme 2: but identical midamble code is used different training skew in each sub-district.For example, the length of training sequence is 128 chips in the TD-SCDMA system.If setting the channel maximum delay is 16 chips, 8 training sequence deviation can be arranged at most then.Can be 7 different skews of per 7 cell allocation, and reuse described skew in other sub-districts, this similar frequency duplex factor as one in frequency planning is 7.Subsequently, terminal will use above-mentioned different training skew to estimate channel impulse response, then terminal can obtain 7 parts of MBMS bursts that recover again, and will adopt maximum ratio merging method, selection merging method or equal gain combining method that described burst is combined, thereby obtain bigger space diversity gain.
Scheme 3: all identical propaedeutics sign indicating number is used in the sub-district.MBMS burst from different nodes B will be on all four, comprise data division and training part.The burst that arrives the receiving terminal antenna of target terminal will merge automatically.User terminal will be estimated a channel impulse response in the channel estimation window.Can obtain space diversity gain equally like this.
By adopting space diversity method of the present invention, can improve spectrum efficiency, avoid sub-district phase mutual interference, improve the decoded signal quality, thereby increase coverage and reduce required website laying quantity.The inventive method realizes that simply, products-hardware does not change, and has only changed scrambler/midamble code, therefore can carry out in the network planning stage simultaneously.
Claims (8)
1. a method of utilizing space diversity receiving method to improve the multimedia broadcast multi-broadcasting business service performance is characterized in that, may further comprise the steps:
Whether the business of (1) judging on the current time slots to be transmitted is multimedia broadcast multicast (MBMS) business;
(2) after judging that the business of being transmitted on the current time slots is the MBMS business, transmitting terminal distributes identical scrambler or the not processing of scrambled code to the data division of this MBMS business burst;
(3) burst after the transmitting terminal identical slot transmission processing in network subsequently;
(4) receiving terminal uses training sequence to carry out channel estimating then, and receives and the merging burst, thereby obtains space diversity gain.
2. method according to claim 1 is characterized in that, each sub-district uses different propaedeutics sign indicating numbers to carry out channel estimating in step (4).
3. method according to claim 1 is characterized in that, each sub-district uses identical midamble code, still different training skews to carry out channel estimating in step (4).
4. method according to claim 1 is characterized in that, all the sub-district uses identical propaedeutics sign indicating number to carry out channel estimating in step (4).
5. method according to claim 1 is characterized in that, in step (1), if the judgement business is not the MBMS business, then carries out conventional Business Processing.
6. method according to claim 1, it is characterized in that, each sub-district use identical midamble code, but when channel estimating was carried out in different training skew, receiving terminal adopted a kind of in the maximum ratio method of merginging, selection merging method or the equal gain combining method that described burst is combined.
7. method according to claim 1 is characterized in that, in step (4), also comprises the step of the MBMS business burst that receives being carried out channel-decoding.
8. method according to claim 1 is characterized in that, in step (4), at wireless chain control layer the burst of different frequency is merged processing based on signal checking sign indicating number and sequence number.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005101074183A CN100555903C (en) | 2005-09-30 | 2005-09-30 | Utilize space diversity receiving method to improve the method for multimedia broadcast multi-broadcasting business service performance |
| JP2008532567A JP4779019B2 (en) | 2005-09-30 | 2006-09-25 | How to improve trunk broadcast service functionality using spatial diversity reception method |
| PCT/CN2006/002523 WO2007036145A1 (en) | 2005-09-30 | 2006-09-25 | Method of using spatial diversity to improve the performance of trunked broadcast service |
| KR1020087010402A KR100960205B1 (en) | 2005-09-30 | 2006-09-25 | Method of using spatial diversity to improve the performance of trunked broadcast service |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005101074183A CN100555903C (en) | 2005-09-30 | 2005-09-30 | Utilize space diversity receiving method to improve the method for multimedia broadcast multi-broadcasting business service performance |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1949677A CN1949677A (en) | 2007-04-18 |
| CN100555903C true CN100555903C (en) | 2009-10-28 |
Family
ID=37899375
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005101074183A Expired - Fee Related CN100555903C (en) | 2005-09-30 | 2005-09-30 | Utilize space diversity receiving method to improve the method for multimedia broadcast multi-broadcasting business service performance |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP4779019B2 (en) |
| KR (1) | KR100960205B1 (en) |
| CN (1) | CN100555903C (en) |
| WO (1) | WO2007036145A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101217300B (en) * | 2007-12-28 | 2011-05-11 | 清华大学 | A channel estimation method for transmit diversity system |
Family Cites Families (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1132370A (en) * | 1997-07-08 | 1999-02-02 | Hitachi Ltd | Mobile body communication system, mobile subscriber exchange, multi-cast communication method and storage medium |
| JP4359691B2 (en) * | 2000-03-03 | 2009-11-04 | 学校法人慶應義塾 | Communications system |
| JP2002335556A (en) * | 2001-05-08 | 2002-11-22 | Sony Corp | Radio communication system and method therefor |
| US7012966B2 (en) * | 2001-05-21 | 2006-03-14 | At&T Corp. | Channel estimation for wireless systems with multiple transmit antennas |
| CN1168246C (en) * | 2002-01-23 | 2004-09-22 | 华为技术有限公司 | Method for providing real time broadcasting service in mobile communication network |
| US7177658B2 (en) * | 2002-05-06 | 2007-02-13 | Qualcomm, Incorporated | Multi-media broadcast and multicast service (MBMS) in a wireless communications system |
| CN1568056A (en) * | 2003-06-12 | 2005-01-19 | 普天信息技术研究院 | A timeslot resource distribution method for time division duplexing mode mobile communication system |
| KR20050013451A (en) * | 2003-07-28 | 2005-02-04 | 삼성전자주식회사 | Apparatus and method for determining soft handover in a cdma mobile communication system providing mbms service |
| US7660275B2 (en) * | 2003-10-24 | 2010-02-09 | Qualcomm Incorporated | Local and wide-area transmissions in a wireless broadcast network |
| GB2408172B (en) * | 2003-11-12 | 2007-11-14 | Ipwireless Inc | Method and apparatus for improved throughput in a communication system |
| WO2005055473A1 (en) * | 2003-12-08 | 2005-06-16 | Samsung Electronics Co., Ltd. | Method and system for generating plcm for bcmcs in a mobile communication system |
| US20050135321A1 (en) * | 2003-12-17 | 2005-06-23 | Jacob Sharony | Spatial wireless local area network |
| US7450489B2 (en) * | 2003-12-30 | 2008-11-11 | Intel Corporation | Multiple-antenna communication systems and methods for communicating in wireless local area networks that include single-antenna communication devices |
-
2005
- 2005-09-30 CN CNB2005101074183A patent/CN100555903C/en not_active Expired - Fee Related
-
2006
- 2006-09-25 JP JP2008532567A patent/JP4779019B2/en not_active Expired - Fee Related
- 2006-09-25 WO PCT/CN2006/002523 patent/WO2007036145A1/en active Application Filing
- 2006-09-25 KR KR1020087010402A patent/KR100960205B1/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| KR20080056268A (en) | 2008-06-20 |
| WO2007036145A1 (en) | 2007-04-05 |
| JP2009510848A (en) | 2009-03-12 |
| CN1949677A (en) | 2007-04-18 |
| KR100960205B1 (en) | 2010-05-27 |
| JP4779019B2 (en) | 2011-09-21 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100401651C (en) | Method and apparatus for determining receive diversity in mobile station | |
| US7315523B2 (en) | Apparatus and method for neighbor assisted combining for multicast services | |
| CN101272522B (en) | Method, system and base station for single frequency network transmitting multimedia broadcast/multicast service | |
| CN105794132A (en) | System and method for providing interference characteristics for interference mitigation | |
| CN104753838A (en) | Interference processing method and device, network control unit and terminal | |
| CN101193094B (en) | A method and system for sending broadcast/multicast service | |
| CN101034921B (en) | Method, network and device for multi-media broadcast and multi-cast service transmission | |
| CN101322325B (en) | Neighbour for multicast service assists equipment and the method for merging | |
| CN103650419A (en) | Mobile communications network, mobile communications device, relay node and method | |
| Li et al. | Spectral-efficient bidirectional decode-and-forward relaying for full-duplex communication | |
| CN1941948B (en) | Method for increasing group broadcasting service performance in mobile telcommunication system | |
| CN101888595B (en) | Method for selecting and soft combining multi-cell signals in multicast broadcast single frequency network | |
| CN101193332A (en) | Method, system and base station for sending broadcast service data in same-frequency network | |
| US20120188932A1 (en) | Pre-coding method in cooperative relay system, communication apparatus, and relay apparatus | |
| KR20090075685A (en) | Cellular communication system, communication unit and method for broadcast communication | |
| CN102421068A (en) | Grouping-based wireless communication | |
| CN102256301B (en) | User selection method for simultaneously meeting unicast and multicast services | |
| CN101299824B (en) | Method, system and subscriber terminal for acquiring multimedia broadcast and multicast service data | |
| CN100555903C (en) | Utilize space diversity receiving method to improve the method for multimedia broadcast multi-broadcasting business service performance | |
| CN101360265B (en) | Data transmission method and system for multimedia broadcast and multicast service | |
| CN101848069A (en) | Multi-antenna data transmission method based on graded service, and system and device thereof | |
| CN101291237A (en) | Downlink data transmission method and apparatus for multicast and broadcast service | |
| CN101291451A (en) | Downlink data transmission method and apparatus for multicast and broadcast service | |
| CN106656297A (en) | Cognitive orthogonal cooperative transmission method in the presence of primary user interference | |
| CN101431717B (en) | Cell search method of multimedia broadcast/multicast service special carrier frequency |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| C41 | Transfer of patent application or patent right or utility model | ||
| PB01 | Publication | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20070202 Address after: 15 floor, block D, Ye Qing building, No. 9 North Wangjing Road, Beijing, Chaoyang District Applicant after: TD TECH Ltd. Address before: No. 7 South Central Road, Chaoyang District, Beijing, Wangjing Applicant before: SIEMENS Ltd. CHINA |
|
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20091028 Termination date: 20210930 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |