CN1972178A - A method for increasing multicast broadcasting service - Google Patents
A method for increasing multicast broadcasting service Download PDFInfo
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- CN1972178A CN1972178A CNA2005101272080A CN200510127208A CN1972178A CN 1972178 A CN1972178 A CN 1972178A CN A2005101272080 A CNA2005101272080 A CN A2005101272080A CN 200510127208 A CN200510127208 A CN 200510127208A CN 1972178 A CN1972178 A CN 1972178A
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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
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0686—Hybrid systems, i.e. switching and simultaneous transmission
- H04B7/0689—Hybrid systems, i.e. switching and simultaneous transmission using different transmission schemes, at least one of them being a diversity transmission scheme
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
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- 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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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2602—Signal structure
- H04L27/2605—Symbol extensions, e.g. Zero Tail, Unique Word [UW]
- H04L27/2607—Cyclic extensions
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- Engineering & Computer Science (AREA)
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- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
This invention relates to one method to strengthen broadcasting business in mobile communication system, which comprises the following steps: selecting proper emission collection scheme then cutting each area into several groups; network controller sends signal sample change circle and rules into each area and the controller sends the collected scheme and signal sample to UE; each area receives sample update circle parameters and relative signal samples change rules and to select certain broadcast signals; UE receives current adopted emission scheme and signal sample circle parameters and to receive signals of broadcasting according to network.
Description
Technical field
The present invention relates to mobile communication system, specifically, the present invention relates to a kind of method that in mobile communication system, strengthens multicast/broadcast business.
Background technology
At present, 3GPP standardization body has set about beginning its existing system standard is carried out long-term evolution (LTE).In the middle of numerous physical layer transmission technology, OFDM (OFDM) technology is with its higher availability of frequency spectrum, and lower processing complexity becomes in all descending schemes more promising a kind of.
Be a kind of multi-carrier modulation communication technology on the OFDM technological essence, its basic principle is the data flow of a two-forty to be decomposed into several rate data streams transmit simultaneously on one group of mutually orthogonal subcarrier.The OFDM technology is because its multicarrier character has performance advantage aspect a lot.(1) significant advantage of OFDM technology is because data parallel transmission on a plurality of subcarriers respectively, and the length of the symbol on each subcarrier increases accordingly, and is insensitive to channel delay; Add protection on each symbol at interval by further giving, promptly introduce Cyclic Prefix (CP), under the situation of channel delay, can eliminate intersymbol interference (ISI) fully less than circulating prefix-length.Like this, each subcarrier has all experienced flat fading channel.Fig. 1 is the schematic diagram that the OFDM symbol adds Cyclic Prefix.Whole OFDM symbol (100) adds Cyclic Prefix (103) by available ofdm signal (101) and forms.Wherein Cyclic Prefix (103) is by some sample values of back (102) of available ofdm signal (101) are realized by the front that direct copy adds available ofdm signal (101) to.(2) availability of frequency spectrum height of OFDM technology, ofdm signal are actual on frequency domain an overlapping, and this overlapping on improved the availability of frequency spectrum to a great extent.(3) ability of the anti-narrow band interference of OFDM technology and frequency selective fading is stronger.Can make OFDM have frequency diversity and time diversity effect by chnnel coding with interweaving, thereby resist narrow band interference and frequency selective fading effectively.(4) modulation of OFDM technology can realize by baseband I FFT conversion, and IFFT/FFT has ripe quick calculation method, can realize in dsp chip and hardware configuration easily.
Multicast/broadcast is a kind of technology that transmits data message from a data source to a plurality of targets.In traditional mobile network, cell broadcaste service allows low bit rate data to share broadcast channel to all users' transmissions by the sub-district, belongs to information series business.Now, people no longer are satisfied with phone and messaging service to the demand of mobile communication, fast development along with Internet, a large amount of multimedia services emerge, the some of them applied business requires a plurality of users can 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, delay sensitive.In order to support new demand, effectively utilize mobile network resource, existing 3GPP normative standard multicast/broadcast business, in the mobile network, provide a data source to send the point-to-multipoint service of data to a plurality of users, the realization Internet resources are shared, improve utilization rate of network resource, the interface resource of especially eating dishes without rice or wine.
In the LTE system, because the change of physical layer transmission technology proposes new demand for the network support multicast/broadcast business.Under the situation that satisfies certain synchronous requirement, the OFDM technology can be supported multicast/broadcast business eaily.At this moment, each sub-district is according to the identical signal of network configuration emission, and Fig. 2 is the schematic diagram that UE merges each sub-district multipath signal.Multipath signal (201) is to arrive the footpath at first, and multipath signal (203) is the last footpath that arrives.The multipath signal (201 that is satisfying each sub-district, 202,203) under the situation of time delay between footpath that arrives at first and the last footpath that arrives less than the length of CP, available ofdm signal in (200) time period signal of each multipath all be continuous, so UE does not exist interference and intersymbol interference between the subcarrier when receiving by FFT.As long as each sub-district arrives the length that the signal time delay scope of UE is no more than Cyclic Prefix, UE can simply merge the signal that receives each sub-district.At this moment, UE be can't outargue is the multipath signal of same signal to the signal of each sub-district.Consider that UE arrives each sub-district relative position, the propagation delay of each cell signal, and the influence of the timing offset of each sub-district receive the merging of each sub-district in order to realize UE, and system need dispose long Cyclic Prefix (CP).
In the system that has disposed a plurality of antennas, can adopt the technology of transmit diversity to make full use of the space diversity effect.The basic principle of transmit diversity is that a plurality of antennas of transmitting terminal adopt the different identical data of signal form emission respectively, and receiving terminal utilizes this difference can realize being equivalent to the performance that maximum ratio merges (MRC).The example of a transmit diversity is at transmitting terminal data to be carried out Space Time Coding, decoding when receiving terminal is carried out sky.
According to the existing discussion result of 3GPP, network is divided into inside and outside two kinds of codings to the coding of multicast/broadcast business data.Interior coding is the coding in a Transmission Time Interval (TTI); And outer coding can be crossed over a plurality of TTI, thereby the diversity that employs one's time to the best advantage improves the performance of multicast/broadcast business.Interior coding can be convolution code, turbo sign indicating number, LDPC sign indicating number etc., and outer coding generally is the RS sign indicating number.In the LTE system, the structure of inside and outside like this coding also is a kind of up-and-coming technology, and because the length of the TTI among the LTE is shorter, the gain meeting of adopting outer coding to bring is more obvious.
Send under the situation of same piece of data with identical signal form in each multicast/broadcast sub-district, UE passes through the soft merging of the effect realization of CP to each cell signal, this soft merging is the simple addition to each cell signal in essence, such merging method can utilize the space diversity characteristic to improve systematic function to a certain extent, but owing to can not make full use of the spatial character of each sub-district, its performance improves limited.Make full use of the spatial characteristics of each sub-district,, can further improve the performance of system in each method that sends the community associated employing transmit diversity of multicast/broadcast business.
According to the characteristic of multicast/broadcast business, the covering of network need be concerned about in each sub-district, and the UE (s) that guarantees to be in the network least favorable position still can acknowledge(ment) signal with certain probability, and the signal that can not send according to the position change of certain UE.Under the situation of each community associated employing transmit diversity, the diverse location of network's coverage area arrives the fading channel difference of each antenna in cell, the signal strength signal intensity difference of each sub-district that can receive, and the diversity gain that obtains is also just unequal.Take certain measure, can obtain the gain of transmit diversity more uniformly at whole network's coverage area.
Summary of the invention
The objective of the invention is to make full use of the spatial characteristics of a plurality of sub-districts that send multicast/broadcast business, the gain of going up the implementation space diversity to greatest extent guarantees can both obtain more uniformly the gain of diversity simultaneously in the All Ranges of the network coverage.
For achieving the above object, a kind of method that strengthens multicast/broadcast business in mobile communication system comprises the steps:
A) network controller is selected suitable emission diversity scheme, and the geographical position according to each sub-district in the network will be distinguished into a plurality of groups for a short time then;
B) network controller sends to each sub-district to parameters such as signal modal shift cycle and modal shift rules by signaling, and simultaneously, network controller is broadcast to UE to the emission diversity scheme and the signal pattern update cycle parameter that adopt by downlink signaling;
C) each sub-district receives the pattern update cycle parameter and corresponding signal modal shift rule of network controller configuration by signaling, and selects certain signal pattern emission multicast/broadcast business signal according to the parameter of network controller configuration;
D) UE receives emission diversity scheme and the parameter of signal pattern update cycle that current system adopts by downlink signaling, and according to the transmit diversity techniques receiving multicast/broadcast signal of network using.
According to the present invention, the transmit diversity to the multicast/broadcast business signal is coordinated to carry out according to the instruction of network controller in each sub-district, can make full use of the spatial characteristics of each sub-district, obtains the antenna diversity gain to greatest extent.Respectively organize the pattern that the sub-district sends signal by periodic variation, in the time period of outside multicast/broadcast business, encoding, the average emitted diversity gain that the UE of each point obtains in the network's coverage area is equal substantially, thereby big as far as possible provide the covering of network, and strengthen the performance of multicast/broadcast business multicast/broadcast business.
Description of drawings
Fig. 1 is the schematic diagram that the OFDM symbol adds Cyclic Prefix;
Fig. 2 is the schematic diagram that UE merges each sub-district multipath signal;
Fig. 3 is the processing schematic diagram of UE receiving multicast/broadcast signal;
Fig. 4 is the pattern distribution map that a kind of each sub-district when adopting double-antenna transmit diversity transmits;
Fig. 5 is the pattern distribution map that a kind of each sub-district when adopting four antenna transmit diversities transmits.
Embodiment
The method that receives at the emission of existing multicast/broadcast business signal and soft merging can not make full use of the problem of the spatial characteristics of each sub-district, and the present invention proposes a kind of method of supporting multicast/broadcast business in mobile communications network.
Among the present invention in the network controller coordinated control network each sub-district to multicast/broadcast business Signal Processing and transmission.Network controller is selected the scheme of suitable transmit diversity, and the geographical position according to each sub-district in the network is divided into a plurality of groups to them then, and every group of sub-district disposes the pattern of identical pilot tone simultaneously according to identical signal form emission multicast/broadcast signal.Because be multicast/broadcast business, network can not be concerned about the characteristic of each UE, the mode of this grouping and the location independent of particular UE.
The cycle of cell signal modal shift and the rule of modal shift are respectively organized in the network controller configuration.Network controller sends to each sub-district to parameters such as signal modal shift cycle and modal shift rules by signaling.Simultaneously, network controller is broadcast to UE to the emission diversity scheme and the signal pattern update cycle parameter that adopt by downlink signaling.The cycle of modal shift is relevant with TTI length with time, system-frame length, the subframe lengths of the inside and outside coding of multicast/broadcast business, and this cycle is less than the time span of the outer coding of multicast/broadcast business.
Each sub-district receives the pattern update cycle parameter and corresponding signal modal shift rule of network controller configuration by signaling, and selects certain signal pattern emission multicast/broadcast business signal according to the parameter of network controller configuration.According to the number of transmit antennas purpose difference of specific cell equipment, this sub-district can send one road signal, multiple signals or whole signal of selected transmit diversity techniques; Each sub-district is provided with timer, and its cycle equals the pattern update cycle, and when timer expired, each sub-district sent the pattern and the pilot pattern of signal according to the rule transformation of network controller configuration.
UE receives emission diversity scheme and the parameter of signal pattern update cycle that current system adopts by downlink signaling, and according to the transmit diversity techniques receiving multicast/broadcast signal of network using, thereby realize being equivalent to the performance that maximum ratio merges.As shown in Figure 3, UE is when receiving the multicast/broadcast business signal, and at first whether the UE intensity that need detect each road signal of transmit diversity can both satisfy the requirement (301) of reception; Receive when requiring when each road signal can both satisfy, UE utilizes all signal demodulating datas (302), at this moment the gain maximum of transmit diversity; Receive when requiring when a certain road or a few roads signal can not satisfy, UE utilizes remaining each road signal demodulating data (303), and the gain of transmit diversity at this moment descends to some extent, but performance still is better than not adopting the situation of transmit diversity.According to network configuration, UE may need to be provided with timer, equals the update cycle of network controller configuration its time-count cycle.When timer arrived, UE need do corresponding operation, processing channel estimation and interpolation etc.In multicast/broadcast business and the time-multiplexed system of unicast service, choose reasonable update cycle parameter can minimize this influence.
Network configuration according to reality, the parameter of using among the present invention, such as the rule change of selected emission diversity scheme, cell group information, signal modal shift cycle, signal pattern etc., can be fixed up in the network planning stage, so just do not need extra broadcast signaling; Perhaps the change that these parameters can be semi-static brings certain flexibility.
Fig. 4 is the pattern distribution map that a kind of each sub-district when adopting double-antenna transmit diversity transmits.Here suppose antenna of each cell configuration, the neighbor cell cooperation realizes double-antenna transmit diversity.Here suppose that the pattern that two kinds of network configuration transmit distributes (400,410), when the pattern refresh counter expired, system was switched between pattern distribution (400) and pattern distribution (410).In pattern distributes (400), for the UE that is in position (401), the two paths of signals intensity of transmit diversity quite or be more or less the same, so diversity gain is bigger; Corresponding therewith is that to being in the UE of identical position (411), the two paths of signals intensity of transmit diversity differs bigger in pattern distributes (410), and the ratio of gains of transmit diversity is less.In pattern distributed (400), for the UE that is in position (402), the two paths of signals intensity of transmit diversity differed bigger, and the ratio of gains of transmit diversity is less; Corresponding therewith is in pattern distributes (410), to being in the UE of identical position (412), the two paths of signals intensity of transmit diversity quite or be more or less the same, so diversity gain is bigger.Like this by in the cycle of interior coding or outer coding, distribute (400) and pattern distributes and switches between (410) at pattern, the gain of the transmit diversity of the central diverse location acquisition of network is equated substantially or more approaching.
Fig. 5 is the pattern distribution map that a kind of each sub-district when adopting four antenna transmit diversities transmits.Here suppose two antennas of each cell configuration, the neighbor cell cooperation realizes four antenna transmit diversities.Here suppose that the pattern that three kinds of network configuration transmit distributes (500,510,520), when the pattern refresh counter expired, system distributed (500) at pattern, and pattern distributes (510) and pattern distributes switches between (520).In pattern distributes (500), to the UE that is in position (501), three tunnel signal strength signal intensities of transmit diversity are stronger, other one road signal is more weak, so diversity gain is restricted; Corresponding therewith is in pattern distributes (510), to being in the UE of identical position (511), is that three tunnel signal strength signal intensities of transmit diversity are stronger equally, and other one road signal is more weak, so diversity gain still is restricted; In pattern distributed (520), to being in the UE of identical position (521), four tunnel signal strength signal intensities of transmit diversity were all more intense, thereby can obtain bigger diversity gain.Also all there is similar situation in other points in the network.Like this by in the cycle of interior coding or outer coding, distribute (500) at pattern, pattern distributes (510) and pattern distributes switches between (520), the gain of the transmit diversity of the central diverse location acquisition of network is equated substantially or more approaching.
Claims (10)
1. a method that strengthens multicast/broadcast business in mobile communication system comprises the steps:
A) network controller is selected suitable emission diversity scheme, then according in the network each
The geographical position of sub-district will be distinguished into a plurality of groups for a short time;
B) network controller by signaling signal modal shift cycle and modal shift rule etc.
Parameter sends to each sub-district, and simultaneously, network controller is broadcast to UE to the emission diversity scheme and the signal pattern update cycle parameter that adopt by downlink signaling;
C) each sub-district receives the pattern update cycle parameter of network controller configuration by signaling
With corresponding signal modal shift rule, and select certain signal pattern emission multicast/broadcast business signal according to the parameter of network controller configuration;
D) UE receives emission diversity scheme and the signal sample that current system adopts by downlink signaling
The parameter of formula update cycle, and according to the transmit diversity techniques receiving multicast/broadcast signal of network using.
2. method according to claim 1 is characterized in that also comprising step:
Each sub-district is provided with timer, and its cycle equals the pattern update cycle, and when timer expired, each sub-district sent the pattern and the pilot pattern of signal according to the rule transformation of network controller configuration.
3. method according to claim 1 is characterized in that described step a) comprises: every group of sub-district disposes identical pilot pattern simultaneously according to identical signal form emission multicast/broadcast signal.
4. method according to claim 1 is characterized in that described step a) comprises: the mode of described grouping and the location independent of particular UE.
5. method according to claim 1 is characterized in that mode, the signal modal shift cycle of scheme, the cell group of described transmit diversity, rule change of signal pattern etc. can be fixed up in the network planning stage.
6. method according to claim 5 is characterized in that the change that mode, the signal modal shift cycle of scheme, the cell group of described transmit diversity, rule change of signal pattern etc. can be semi-static.
7. method according to claim 1, it is characterized in that described step b) comprises: the cycle of modal shift is relevant with TTI length with time, system-frame length, the subframe lengths of the inside and outside coding of multicast/broadcast business, and this cycle is less than the time span of the outer coding of multicast/broadcast business.
8. method according to claim 1 is characterized in that described step c) comprises: according to specific cell number of transmit antennas purpose difference, the sub-district can send one road signal, multiple signals or whole signal of selected transmit diversity techniques.
9. method according to claim 1 is characterized in that described step d) comprises:
Whether the intensity of each road signal of UE detection transmit diversity can both satisfy the requirement of reception;
Receive when requiring when each road signal can both satisfy, UE utilizes all signal demodulating datas;
Receive when requiring when a certain road or a few roads signal can not satisfy, UE utilizes remaining each road signal demodulating data.
10. method according to claim 1 is characterized in that also comprising: according to system configuration, UE need be provided with timer, equal the signal pattern update cycle of network controller configuration its time-count cycle, when timer arrived, UE need do corresponding operation, processing channel estimation and interpolation etc.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2005101272080A CN1972178A (en) | 2005-11-25 | 2005-11-25 | A method for increasing multicast broadcasting service |
| PCT/KR2006/004975 WO2007061250A1 (en) | 2005-11-25 | 2006-11-24 | Method for enhancing multicast/broadcast service |
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2005101272080A CN1972178A (en) | 2005-11-25 | 2005-11-25 | A method for increasing multicast broadcasting service |
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| CN1972178A true CN1972178A (en) | 2007-05-30 |
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| WO (1) | WO2007061250A1 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102111719A (en) * | 2009-12-29 | 2011-06-29 | 宏碁股份有限公司 | Resource allocation method, resource indication method and mobile communication device thereof |
| CN102111719B (en) * | 2009-12-29 | 2016-12-14 | 宏碁股份有限公司 | Resource allocation method, resource indicating method and its device for mobile communication |
| CN107852713A (en) * | 2015-01-30 | 2018-03-27 | 高通股份有限公司 | Support to transmission mode and the influence of the PDCCH blind decodings to (point-to-multipoint) transmission of PTM |
| CN114125723A (en) * | 2020-08-27 | 2022-03-01 | 中国移动通信有限公司研究院 | Method, terminal and network side equipment for realizing broadcast multicast service |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101516062B (en) * | 2008-02-20 | 2013-08-21 | 中兴通讯股份有限公司 | Resource allocation method for multicast services of multimedia broadcast in nontransparent relay station mode |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3543770B2 (en) * | 2001-02-20 | 2004-07-21 | 日本電気株式会社 | MOBILE COMMUNICATION SYSTEM, MOBILE TERMINAL, TRANSMISSION DIVERSITY APPLICATION METHOD USED FOR THEM, AND PROGRAM THEREOF |
| JP3976168B2 (en) * | 2001-09-06 | 2007-09-12 | 株式会社エヌ・ティ・ティ・ドコモ | Transmitter and receiver |
-
2005
- 2005-11-25 CN CNA2005101272080A patent/CN1972178A/en active Pending
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2006
- 2006-11-24 WO PCT/KR2006/004975 patent/WO2007061250A1/en active Application Filing
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102111719A (en) * | 2009-12-29 | 2011-06-29 | 宏碁股份有限公司 | Resource allocation method, resource indication method and mobile communication device thereof |
| CN102111719B (en) * | 2009-12-29 | 2016-12-14 | 宏碁股份有限公司 | Resource allocation method, resource indicating method and its device for mobile communication |
| CN107852713A (en) * | 2015-01-30 | 2018-03-27 | 高通股份有限公司 | Support to transmission mode and the influence of the PDCCH blind decodings to (point-to-multipoint) transmission of PTM |
| CN107852713B (en) * | 2015-01-30 | 2022-03-22 | 高通股份有限公司 | Support of transmission modes and impact of PDCCH blind decoding on PTM (Point-to-multipoint) transmissions |
| CN114125723A (en) * | 2020-08-27 | 2022-03-01 | 中国移动通信有限公司研究院 | Method, terminal and network side equipment for realizing broadcast multicast service |
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| WO2007061250A1 (en) | 2007-05-31 |
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