CN101192876B - A single-frequency network and method for broadcast information transmission - Google Patents
A single-frequency network and method for broadcast information transmission Download PDFInfo
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Abstract
The invention discloses a method for sending the broadcast information in a single frequency network, which is characterized in that the method comprises the steps that: A. the sectors of the single frequency network are set in groups and the sectors of the same base station are specified in different groups; B. the scrambling codes and the channel estimation codes which are different from each other are allocated for various groups of sectors; and C. the various sectors send the signal containing the channel estimation codes and the broadcast information after going through the scrambling processing adopting the scrambling codes into the coverage area. The problem that the performance of receiving the signal by UE at the sector margin of the same base station in the single frequency network is obviously lowered is solved by the invention. The invention also discloses a single frequency network.
Description
Technical field
The present invention relates to the mobile communication technology field, the method for particularly a kind of Single Frequency Network and transmission broadcast message thereof.
Background technology
Along with developing rapidly of mobile communication and interference networks, a large amount of mobile multi-media services has appearred, the some of them applied business needs a plurality of subscriber equipmenies (UE) to receive identical data simultaneously, as video request program, television broadcasting, video conference, online education, interactive game etc.These mobile multi-media services are compared with general data, have characteristics such as data volume is big, longer duration.In order to effectively utilize mobile network resource, global standards tissue (3GPP) proposes broadcasting and multicast service (MBMS:Multimedia Broadcast/Multicast Service), MBMS is meant that a data source sends the point-to-multipoint service of data to a plurality of UE, thereby realizes sharing of Internet resources.MBMS is different with cell broadcaste service (CBS:cell broadcast service) in the prior mobile network, and CBS allows low bit rate data to share broadcast channel to all users' transmissions by the sub-district, is a kind of message based business.And MBMS can not only realize the multicast and the broadcasting of plain text low rate message, and can realize the multicast and the broadcasting of high-speed multimedia business.
But the MBMS spectrum efficiency is lower, so 3GPP has introduced Single Frequency Network (the SFN:single frequency network) technology in the industrial ground broadcast standard in MBMS, be that all sub-districts among the SFN are in the identical time, utilize identical physical resource, comprise: the time, frequency, code channel, scrambler and channel estimating code, send identical MBMS business, even like this at cell edge, subscriber equipment also can receive the useful signal from different districts, and the used useful signal that receives directly merged eating dishes without rice or wine to carry out energy, can also obtain to come from the diversity gain in different paths.Thereby improved the service quality of the MBMS business of whole SFN regional extent.
Fig. 1 is SFN three sector strucre topological diagrams.As shown in Figure 1, each cellular cell is made up of three sectors among the SFN, and three sectors have same base station.All sectors are distributed the time resource that identical broadcasting service is used unitedly, frequency resource, scrambler and channel estimating code, all UE in the sector also use identical time resource, frequency resource, scrambler and channel estimating code are come receiving broadcast service, so just can guarantee so long as can be received by UE from the sector signals among the SFN, UE contains the signal that identical channel estimating code and identical scrambler carry out the broadcast message after scrambling is handled for what receive from what a plurality of base stations sent, adopt estimator to carry out channel estimating, the broadcast singal of a plurality of base stations is used as many through receiving, and all signals that receive are directly merged eating dishes without rice or wine, thereby improved receptivity greatly to broadcasting service.
But in the existing SFN technology, two occur from the useful signals of adjacent sectors that the probability with reverse is very big in the same way, have so just strengthened the signal amplitude of variation of adjacent two sector channel, and the performance of UE received signal is obviously descended.
Existing scrambler based on all sectors in the grand diversity technique scheme of associated detecting method all is different with channel estimating code, each adjacent sectors is measured, choose and carry out the adjacent sectors that grand diversity merges, and obtain this sector and the MBMS signal of the adjacent sectors chosen, carrying out many sector channel estimates, obtain the channel response result of this sector and adjacent sectors, calculate and merge the transmission matrix of each sector respectively, utilize the transmission matrix after merging to carry out joint-detection according to response results.When joint-detection is dispatched at the MBMS business, determine to need in the system to transmit the sector of MBMS business,, dispose it and use identical time interval resource for the data that need in adjacent a plurality of sectors, send, and coordinate the emission data of each sector, guarantee that adjacent sectors sends identical data simultaneously.UE determines to carry out the adjacent sectors that diversity merges by measuring, and the MBMS signal of these sectors is carried out diversity reception, is used to carry out joint-detection from the identical characteristic of each sector data, thereby has improved the received signal of UE.
Existing grand diversity technique based on associated detecting method, though there is not the problem that UE received signal performance obviously descends in the above-mentioned SFN technology, but because the capabilities limits of UE joint-detection, can only carry out joint-detection to 5～6 adjacent sectors that signal is the strongest, thereby dwindle the range of receiving of UE.As shown in Figure 1, be arranged in sector 1 UE, can only receive the signal of 0,1,2,5,6,8 and 9 sectors, and the useful signal that derives from other sector will be used as to disturb and handle.
In sum, existing SFN technology has reduced the performance of UE received signal, and existing grand diversity technique based on associated detecting method can only receive the useful signal of adjacent sectors on every side, thereby has dwindled the scope of UE reception useful signal.
Summary of the invention
The invention provides the method for a kind of Single Frequency Network and transmission broadcast message thereof, the problem that UE received signal performance obviously reduces occurs in order to the sector-edge that solves same base among the existing SFN.
The inventive method comprises:
Single Frequency Network comprises more than one base station, and each base station comprises the more than one sector that covers different directions, and this method comprises:
A, the sector of Single Frequency Network is divided into groups to be provided with, the sector of same base is divided in different groups;
B, be that scrambler and channel estimating code are distributed in every group of sector, wherein the scrambler that distributes of every group of sector is different with channel estimating code;
C, described each sector send in the overlay area and comprise described channel estimating code and adopt described scrambler to carry out the signal of the broadcast message after scrambling is handled;
Subscriber equipment receive described comprise described channel estimating code and adopt described scrambler to carry out the signal of the broadcast message after scrambling is handled after, the broadcast message of utilizing the different channel estimating code that receives that the different scrambler scrambling of process that receives is handled is carried out grand diversity and is merged.
Packet count is less than or equal to subscriber equipment and carries out the maximum sector number that joint-detection can be supported.
Sector in same group has identical coverage direction.
Subscriber equipment adopts associated detecting method to finish described grand diversity merging.
Subscriber equipment receive described comprise described channel estimating code and adopt described scrambler to carry out the signal of the broadcast message after scrambling is handled after, utilize described channel estimating code that the broadcast message of handling through the different scrambling codes scrambling that receives is carried out comprising before grand diversity merges:
Subscriber equipment directly merges as multipath signal with the signal that adopts identical scrambler to carry out the broadcast message after scrambling is handled the identical channel estimating code of receiving that contains.
A kind of Single Frequency Network broadcast system comprises more than one base station and some subscriber equipmenies, and wherein each base station sends identical broadcast message in the overlay area of this broadcast system, and this Single Frequency Network broadcast system comprises more than one set of sectors,
Described base station, be used in self-contained each sector coverage area, sending and comprise channel estimating code and adopt scrambler to carry out the signal of the broadcast message after scrambling is handled, and the signal of sector comprises the same channel estimated code and adopts identical scrambler to carry out broadcast message after scrambling is handled on the same group, and the signal of sector does not comprise the different channels estimated code and adopts different scrambling codes to carry out broadcast message after scrambling is handled on the same group;
Described subscriber equipment, be used for receive described comprise described channel estimating code and adopt described scrambler to carry out the signal of the broadcast message after scrambling is handled after, the broadcast message of utilizing the different channel estimating code that receives that the different scrambler scrambling of process that receives is handled is carried out grand diversity and is merged.
Subscriber equipment adopts associated detecting method to finish described grand diversity merging.
Described subscriber equipment can also comprise:
Merge module, be used for the identical channel estimating code of receiving that contains is directly merged as multipath signal with the signal that adopts identical scrambler to carry out the broadcast message after scrambling is handled.
The present invention divides into groups the sector among the SFN to be provided with, the sector of same base is divided in different groups, UE to sector on the same group sends identical scrambler and channel estimating code, to not on the same group the subscriber equipment of sector send different scrambler and channel estimating code, improve the performance of UE received signal in SFN, and enlarged the scope of UE received signal in associated detection technique.
Description of drawings
Fig. 1 is SFN three sector strucre topological diagrams;
Fig. 2 is the composition schematic diagram of system of the present invention;
Fig. 3 is for realizing the schematic flow sheet of the inventive method;
Fig. 4 is the schematic flow sheet of the embodiment of the invention.
Embodiment
At at present in existing SFN the sector-edge of same base the problem that UE received signal performance obviously reduces appears, the present invention is provided with by being divided into groups in the sector among the SFN, the sector of same base is divided in different groups, UE to sector on the same group sends identical scrambler and channel estimating code, to not on the same group the UE of sector send different scrambler and channel estimating code, thereby solved the problems referred to above.
Fig. 2 is the composition schematic diagram of system of the present invention.As shown in Figure 2, system of the present invention comprises: above base station 10 and UE 20.
UE 20, with base station 10 wireless connections, be used for after receiving that comprising channel estimating code carries out the signal of the broadcast message after scrambling is handled with the employing scrambler, the broadcast message employing associated detecting method that the different channel estimating code that utilization receives is handled the different scrambler scrambling of process that receives carries out grand diversity merging.
UE20 also comprises: merge module 200.
Merge module 200, be used for the identical channel estimating code of receiving that contains is directly merged as multipath signal with the signal that adopts identical scrambler to carry out the broadcast message after scrambling is handled.
Fig. 3 is for realizing the schematic flow sheet of the inventive method.As shown in Figure 3, the inventive method comprises the following steps:
Wherein, the signal of sector comprises described same channel estimated code and adopts described identical scrambler to carry out broadcast message after scrambling is handled on the same group, and the signal of sector does not comprise described different channels estimated code and adopts described different scrambling codes to carry out broadcast message after scrambling is handled on the same group.
The principle of grouping is: the sector of same base is divided in different groups, and guarantees that preferably the sector in same group has identical coverage direction, and packet count is less than or equals subscriber equipment carries out the maximum sector number that joint-detection can be supported.
According to above-mentioned group forming criterion, divided into groups in each sector among Fig. 1, as following table:
To identical scrambler and the channel estimating code of sector configuration on the same group, on the same group sector configuration not different around sign indicating number and channel estimating code, as following table:
| The |
1 | 2 | 3 |
| Scrambler | 1 | 2 | 3 |
| Channel estimating |
1 | 2 | 3 |
Fig. 4 is the schematic flow sheet of the embodiment of the invention.As shown in Figure 4, present embodiment comprises the following steps:
Identical time resource and frequency resource are distributed to each sector in step 402, base station.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (6)
1. send the method for broadcast message in the Single Frequency Network, described Single Frequency Network comprises more than one base station, and each base station comprises the more than one sector that covers different directions, it is characterized in that, this method comprises:
A, the sector of Single Frequency Network is divided into groups to be provided with, the sector of same base is divided in different groups;
B, be that scrambler and channel estimating code are distributed in every group of sector, wherein the scrambler that distributes of every group of sector is different with channel estimating code;
C, each sector send in the overlay area and comprise described channel estimating code and adopt described scrambler to carry out the signal of the broadcast message after scrambling is handled;
Subscriber equipment receive described comprise described channel estimating code and adopt described scrambler to carry out the signal of the broadcast message after scrambling is handled after, the identical channel estimating code of receiving that contains is directly merged as multipath signal with the signal that adopts identical scrambler to carry out the broadcast message after scrambling is handled, and the broadcast message that the different channel estimating code that utilization receives is handled the different scrambler scrambling of process that receives is carried out grand diversity and is merged.
2. the method for claim 1 is characterized in that, packet count is less than or equal to subscriber equipment and carries out the maximum sector number that joint-detection can be supported.
3. the method for claim 1 is characterized in that, the sector in same group has identical coverage direction.
4. the method for claim 1 is characterized in that, described subscriber equipment adopts associated detecting method to finish described grand diversity merging.
5. Single Frequency Network broadcast system, comprise more than one base station and some subscriber equipmenies, wherein each base station sends identical broadcast message in the overlay area of this broadcast system, it is characterized in that, this Single Frequency Network broadcast system comprises more than one set of sectors, each base station comprises the more than one sector that covers different directions, and the sector of same base is divided in different set of sectors;
Described base station, be used in self-contained each sector coverage area, sending and comprise channel estimating code and adopt scrambler to carry out the signal of the broadcast message after scrambling is handled, and the signal of sector comprises the same channel estimated code and adopts identical scrambler to carry out broadcast message after scrambling is handled on the same group, and the signal of sector does not comprise the different channels estimated code and adopts different scrambling codes to carry out broadcast message after scrambling is handled on the same group;
Described subscriber equipment, be used for receive described comprise described channel estimating code and adopt described scrambler to carry out the signal of the broadcast message after scrambling is handled after, the identical channel estimating code of receiving that contains is directly merged as multipath signal with the signal that adopts identical scrambler to carry out the broadcast message after scrambling is handled, and the broadcast message that the different channel estimating code that utilization receives is handled the different scrambler scrambling of process that receives is carried out grand diversity and is merged.
6. system as claimed in claim 5 is characterized in that, subscriber equipment adopts associated detecting method to finish described grand diversity merging.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2006101147916A CN101192876B (en) | 2006-11-23 | 2006-11-23 | A single-frequency network and method for broadcast information transmission |
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| CN2006101147916A CN101192876B (en) | 2006-11-23 | 2006-11-23 | A single-frequency network and method for broadcast information transmission |
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| CN101192876B true CN101192876B (en) | 2011-06-29 |
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| CN103260133B (en) * | 2008-08-11 | 2016-12-07 | 华为技术有限公司 | Mark transmission, acquisition methods and evolution base station, terminal and communication system |
| CN111385046B (en) * | 2020-04-14 | 2024-10-01 | 北京航天广通科技有限公司 | Amplitude modulation broadcast interference assessment method and device |
| CN114095875B (en) * | 2020-08-24 | 2023-05-23 | 大唐移动通信设备有限公司 | Transmission area processing method for Multimedia Broadcast Multicast Service (MBMS) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1666454A (en) * | 2002-05-06 | 2005-09-07 | 高通股份有限公司 | Multimedia Broadcast Multicast Service (MBMS) in Wireless Communication System |
| CN1791161A (en) * | 2004-12-13 | 2006-06-21 | 美国博通公司 | Method and system for communicating with multi communication nets |
| CN1867154A (en) * | 2005-05-17 | 2006-11-22 | 上海原动力通信科技有限公司 | Beam form-endowing and realizing method for co-frequency network |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1666454A (en) * | 2002-05-06 | 2005-09-07 | 高通股份有限公司 | Multimedia Broadcast Multicast Service (MBMS) in Wireless Communication System |
| CN1791161A (en) * | 2004-12-13 | 2006-06-21 | 美国博通公司 | Method and system for communicating with multi communication nets |
| CN1867154A (en) * | 2005-05-17 | 2006-11-22 | 上海原动力通信科技有限公司 | Beam form-endowing and realizing method for co-frequency network |
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