CN1941948B - Method for increasing group broadcasting service performance in mobile telcommunication system - Google Patents
Method for increasing group broadcasting service performance in mobile telcommunication system Download PDFInfo
- Publication number
- CN1941948B CN1941948B CN2005101077995A CN200510107799A CN1941948B CN 1941948 B CN1941948 B CN 1941948B CN 2005101077995 A CN2005101077995 A CN 2005101077995A CN 200510107799 A CN200510107799 A CN 200510107799A CN 1941948 B CN1941948 B CN 1941948B
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- Prior art keywords
- signal
- broadcasting service
- cluster
- user terminal
- signals
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Classifications
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- 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
- H04B7/12—Frequency diversity
-
- 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
- H04B7/022—Site diversity; Macro-diversity
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/30—Resource management for broadcast services
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
- Radio Transmission System (AREA)
Abstract
The method comprises: 1) at current cell and/or neighboring cells, using at least two frequencies to transmit same cluster broadcast service signals; the diversity receiver at user end respectively receives said at least two cluster broadcast service signals, and according to a predetermined diversity combination approach, combines the received signals in order to get the gaining signals. In the invention, the cluster broadcast signals can be transmitted in different time slots, and the interval of time slot is bigger, the interval of frequency is bigger, such that the correlation between thesignals can be reduced, so the diversity gain of signal can be provided.
Description
Technical field
The present invention relates to a kind of method of in mobile communication system, promoting cluster broadcasting service performance, more specifically, relate to a kind of method of in wireless communication system, utilizing frequency diversity gain to improve the cluster broadcasting service coverage.
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.
In current 3GPP standard, have with the professional similar characteristics of MBMS be broadcast channel BCCH with low data rate, BCCH is mapped on the Common Control Channel PCCPCH.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.
Therefore, how increasing the ability that receiving terminal receives the cluster broadcasting service that comprises the MBMS business, thereby enlarge its coverage, then is a urgent problem.
Summary of the invention
Thereby the object of the present invention is to provide a kind of method that can increase cluster broadcast reception ability improvement cluster broadcasting service coverage rate.
According to the present invention, a kind of method of promoting cluster broadcasting service performance in mobile communication system is provided, it is characterized in that, may further comprise the steps:
(1) in this sub-district and/or neighbor cell with at least two different frequencies at the identical cluster broadcasting service signal of different time slot emission;
(2) diversity receiver at user terminal receives at least two cluster broadcasting service signals accordingly respectively;
(3) described diversity receiver merges processing according to a kind of predetermined diversity combining method to described at least two cluster broadcasting service signals that receive, to obtain the signal of gain.
Described cluster broadcasting service signal is the multimedia broadcast multi-broadcasting business signal.
According to the present invention, the interval between the different time slots is big as much as possible, and the interval of different time-gap can allow user terminal to carry out receiving the switching that another subcarrier receives from a subcarrier; In addition, the frequency of described different frequency differs and is the bigger the better, to reduce correlation between signals.
Merging processing method of the present invention can be a kind of in selectivity merging method, high specific merging method or the equal gain combining method.
In the present invention, comprise that also the cluster broadcasting service signal to receiving carries out channel-decoding, and the application layer of user terminal is carried out processed conventionally step to the signal that gains.
In addition, in the present invention, be based on signal checking sign indicating number and sequence number and the signal of different frequency merged processing at wireless chain control layer.
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 the schematic diagram that different frequency transmits and merges at different time-gap according to the present invention.
Embodiment
In wireless communication system, the method that increases the terminal receiving ability has a lot, for example can increase the received power of receiving terminal by increasing the transmitting power of transmitting terminal.But these methods all need system equipment is carried out fairly large transformation, and dropping into like this can be very big, and cost also can be very high.
According to the present invention, can be by significantly not increasing the receiving ability that scrap build improves signal.The present invention realizes by the ability of the diversity reception that improves receiving terminal, acquisition diversity gain.
So-called diversity reception is meant that receiving terminal carries out specific processing to the mutual independently signal of a plurality of fading characteristics that it receives, to reduce the method that signal level rises and falls.Diversity gain can obtain by merging unrelated signal.Fig. 1 shows and carry out the schematic diagram that signal merges on user terminal.The antenna of user terminal receives the signal of different districts, passes to two different diversity receivers then and decodes, and carries out process encoding based on check code (CRC) and sequence number then, passes to application layer at last and carries out conventional treatment.
Because identical cluster broadcasting service is provided, can improve this professional coverage by the signal that merges from neighbor cell near the user who is positioned at the cell edge in neighbor cell.When identical data transmitted between different districts, the user can receive the signal from this sub-district and neighbor cell, merged to carry out follow-up signal.
After signal merges, can produce the diversity gain on space and/or the time domain.Then can obtain space diversity gain by the signal that merges in the different transmission path; And utilizing signal can have the characteristics of incoherent transmission feature in the transmission of different time, for example decline then can obtain the time domain diversity gain by being incorporated in the signal that different time-gap receives.
Different with said method, the invention provides and utilize frequency to merge to obtain the method for frequency diversity gain, thereby can improve the receiving ability of user terminal.
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 at neighbor cell broadcasting identical data, use the characteristics of multicarrier, all can use technical scheme of the present invention.
According to the present invention, each sub-district has at least two subcarriers, and what describe in an embodiment of the present invention is the system of two subcarriers, transmits for the subcarrier of identical data by two different frequencies.Owing to will obtain better diversity gain, therefore the correlation between two sub-carrier signals is the smaller the better, so that receiver merges a plurality of independently fading signals that receive to reduce the influence of decline.Therefore, require two frequency differences between the subcarrier high more good more, to avoid the correlation between the subcarrier.
Then, the user terminal receiver receives the carrier signal of different frequency, and according to a kind of merge algorithm, these two carrier signals is merged, to obtain better decoding performance.
Merge algorithm of the present invention belongs to method well known in the art, for example, selects merge algorithm, and the high specific merge algorithm waits gain algorithm.Those of ordinary skills can select the merge algorithm that is fit to as the case may be.
According to the present invention,, therefore can improve the ability of receiving terminal received signal greatly, thereby can enlarge the coverage of MBMS business because diversity gain obtains to improve.
According to a preferred embodiment of the present invention, has bigger irrelevance in order to make between the data that receive, the user is transmitted at the different time-gap of described two different subcarriers, and can be defined in transmission time slot on described two subcarriers be separated by far away more good more so that reduce the correlation of signal in time domain.
According to technical scheme of the present invention, be example with 1.28Mcps time division duplex (TDD) network, regulation subcarrier 1 (F1) transmits on time slot TS4, and regulation subcarrier 2 (F2) transmits on time slot TS6.The transmission of signal is not carried out at identical time slot on different sub carrier, and one of its reason is must take in the required processing time of user terminal, so that allow user terminal to carry out receiving the switching that another subcarrier receives from a subcarrier; Set time enough simultaneously and can also improve the time domain diversity gain at interval, thereby can further improve the signal reception of receiving terminal.
Because slot sytem when Frequency Division Duplexing (FDD) (FDD) system is not, on up link UL and down link DL, transmission is continuous in time domain.Therefore, in the FDD system, need not consider time slot allocation.
This scheme of the application of the invention, user terminal not only can merge two signals that subcarrier transmits of this sub-district, can also merge two signals that subcarrier transmits of this sub-district and neighbor cell.
Since will in conjunction with signal receive by two different frequencies and/or two different time-gaps, diversity gain is not only from frequency domain, and can be from time domain.
Method of the present invention can be used to improve the receptivity of multi-media broadcasting service, and thereby increased should business cell coverage, reduced the deployment quantity of web-site.This method also can with the use that combines of other method, timeslot multiplex for example is with further raising performance.
Content according to the present invention is appreciated that the present invention not only can be used for 1.28Mcps TDD system, also can be used for systems such as 3.84Mcps TDD system and WCDMA.
Here it should be noted that in a preferred embodiment of the invention, what provide is the situation with two subcarriers, still, the quantity that is appreciated that subcarrier can be two or more, and this depends on the characteristic of sub-district and the planning of network.
Claims (7)
1. a method of promoting cluster broadcasting service performance in mobile communication system is characterized in that, may further comprise the steps:
(1) in this sub-district and/or neighbor cell with at least two different frequencies at the identical cluster broadcasting service signal of different time slot emission;
(2) diversity receiver at user terminal receives at least two cluster broadcasting service signals accordingly respectively;
(3) described diversity receiver merges processing according to a kind of predetermined diversity combining method to described at least two cluster broadcasting service signals that receive, to obtain the signal of gain.
2. method according to claim 1 is characterized in that, described cluster broadcasting service signal is the multimedia broadcast multi-broadcasting business signal.
3. method according to claim 1 and 2 is characterized in that, in step (1), the interval of described different time-gap can allow described user terminal to carry out receiving the switching that another subcarrier receives from a subcarrier.
4. method according to claim 1 is characterized in that, the merging processing method described in the step (3) is a kind of in selectivity merging method, high specific merging method or the equal gain combining method.
5. method according to claim 1 is characterized in that, in step (2) afterwards, also comprises the step of the cluster broadcasting service signal that receives being carried out channel-decoding.
6. method according to claim 1 is characterized in that, in step (3), at wireless chain control layer the signal of different frequency is merged processing based on signal checking sign indicating number and sequence number.
7. method according to claim 1 is characterized in that, in step (3) afterwards, comprises that also the application layer of user terminal is carried out processed conventionally step to the signal that gains.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2005101077995A CN1941948B (en) | 2005-09-30 | 2005-09-30 | Method for increasing group broadcasting service performance in mobile telcommunication system |
| PCT/EP2006/066644 WO2007039494A1 (en) | 2005-09-30 | 2006-09-22 | Method for improving service performance of a trunk broadcasting service in a mobile communication system |
| EP06793758A EP1935116A1 (en) | 2005-09-30 | 2006-09-22 | Method for improving service performance of a trunk broadcasting service in a mobile communication system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2005101077995A CN1941948B (en) | 2005-09-30 | 2005-09-30 | Method for increasing group broadcasting service performance in mobile telcommunication system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1941948A CN1941948A (en) | 2007-04-04 |
| CN1941948B true CN1941948B (en) | 2010-12-01 |
Family
ID=37560717
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2005101077995A Expired - Fee Related CN1941948B (en) | 2005-09-30 | 2005-09-30 | Method for increasing group broadcasting service performance in mobile telcommunication system |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP1935116A1 (en) |
| CN (1) | CN1941948B (en) |
| WO (1) | WO2007039494A1 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102026100B (en) * | 2007-07-23 | 2012-09-05 | 电信科学技术研究院 | Multimedia broadcast and multicast service transmitting, receiving method and apparatus |
| CN101355400A (en) * | 2007-07-23 | 2009-01-28 | 大唐移动通信设备有限公司 | Method and equipment for transmitting and receiving multimedia broadcast/multicast service |
| CN102118696B (en) * | 2007-07-23 | 2012-09-05 | 电信科学技术研究院 | Methods and devices for transmitting and receiving multimedia broadcast/multicast services |
| CN101374269B (en) * | 2007-08-23 | 2012-10-10 | 中兴通讯股份有限公司 | MBMS resources distribution method for TDD mode wireless communication system |
| US8229441B2 (en) | 2007-08-24 | 2012-07-24 | Avaya Inc. | Graduated single frequency network |
| CN101729517B (en) * | 2008-10-27 | 2012-09-05 | 电信科学技术研究院 | Method and device for transmitting and receiving multimedia broadcast/multicast service (MBMS) |
| CN101754374B (en) * | 2009-12-24 | 2013-08-07 | 中兴通讯股份有限公司 | Cluster system and broadcast message sending method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1331870A (en) * | 1998-11-24 | 2002-01-16 | 艾尔耐特通信公司 | TDMA in-bandstranslator having delay ni multiple paths to allow for selective diversity and automatic level control |
| US6792258B1 (en) * | 1999-04-15 | 2004-09-14 | British Broadcasting Corporation | Diversity reception method and diversity receivers |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB881548A (en) * | 1958-05-22 | 1961-11-08 | Standard Telephones Cables Ltd | Combining system for diversity communication systems |
| US6433668B1 (en) * | 1990-05-25 | 2002-08-13 | Seiko Instruments Inc. | Paging system with spacial, frequency and time diversity |
| US5944659A (en) * | 1995-11-13 | 1999-08-31 | Vitalcom Inc. | Architecture for TDMA medical telemetry system |
| US6185258B1 (en) * | 1997-09-16 | 2001-02-06 | At&T Wireless Services Inc. | Transmitter diversity technique for wireless communications |
| EP2271041B1 (en) * | 2000-07-12 | 2018-10-10 | Qualcomm Incorporated | Method and apparatus for generating pilot signals in a MIMO system |
| DE60115390T2 (en) * | 2001-05-14 | 2006-07-13 | Sony Deutschland Gmbh | Radio receiver with antenna and frequency diversity |
-
2005
- 2005-09-30 CN CN2005101077995A patent/CN1941948B/en not_active Expired - Fee Related
-
2006
- 2006-09-22 WO PCT/EP2006/066644 patent/WO2007039494A1/en active Application Filing
- 2006-09-22 EP EP06793758A patent/EP1935116A1/en not_active Withdrawn
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1331870A (en) * | 1998-11-24 | 2002-01-16 | 艾尔耐特通信公司 | TDMA in-bandstranslator having delay ni multiple paths to allow for selective diversity and automatic level control |
| US6792258B1 (en) * | 1999-04-15 | 2004-09-14 | British Broadcasting Corporation | Diversity reception method and diversity receivers |
Also Published As
| Publication number | Publication date |
|---|---|
| EP1935116A1 (en) | 2008-06-25 |
| WO2007039494A1 (en) | 2007-04-12 |
| CN1941948A (en) | 2007-04-04 |
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Granted publication date: 20101201 Termination date: 20180930 |