CN104661186A - Novel e-MBMS system using statistical multiplexing of radio remote equipment - Google Patents
Novel e-MBMS system using statistical multiplexing of radio remote equipment Download PDFInfo
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- CN104661186A CN104661186A CN201310599790.5A CN201310599790A CN104661186A CN 104661186 A CN104661186 A CN 104661186A CN 201310599790 A CN201310599790 A CN 201310599790A CN 104661186 A CN104661186 A CN 104661186A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/02—Resource partitioning among network components, e.g. reuse partitioning
- H04W16/10—Dynamic resource partitioning
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
Abstract
The invention discloses a novel e-MBMS system using statistical multiplexing of radio remote equipment. An encoder and a multiplexer system perform joint work, and the encoder must have a dynamic rate control function; the other one is statistical re-multiplexing, wherein an input TS stream (no matter where it comes from) is analyzed to show which ES image ingredients have low speed at the moment and which ES ingredients have high speed at the moment; then the data in the TS stream are processed accordingly, so that the low-speed ingredients occupy lower bit rates, while the high-speed ingredients occupy high bit rates (in order to perform virtual decoding/encoding process), and the total output bit rate is fixed, without joint work with the encoder.
Description
(1) field
The novel e-MBMS system of the statistic multiplexing of radio frequency remote equipment that utilizes belongs to electronic information field.
(2) brief introduction
" multiplexing " is noun conventional in the communication technology, refers to the technology simultaneously transmitting multiple signals in same transmission medium, in order to improve the utilance of communication line.Conventional mode has frequency division multiplexing, time division multiplexing, code division multiplexing etc.
Frequency division multiplexing utilizes different frequencies to make different signals transmit simultaneously and not interfere with each other; Time division multiplexing utilizes different time slots to make different signals transmit simultaneously and not interfere with each other; Code division multiplexing utilizes the code of each road signal mutually orthogonal and realizes not interfereing with each other.
As long as statistic multiplexing is applied to digital television program multiplexer and the packet switching network.
In digital TV field, be multiplexingly divided into generally multiplexing and statistic multiplexing.
Generally the information of multiplexing multiple TS streams by input is aggregated into the higher TS stream output of a bit rate, does not change the bit rate of contained programme information in each TS stream.
Statistic multiplexing then can analyze each Input connection object concrete condition, and distribution according to need, makes limited bit rate reasonably as far as possible can carry out dynamic assignment between all programs, does not affect the object of program quality to reach compression gross bit rate as far as possible.
In Digital Television, statistic multiplexing divides two kinds, a kind of is general statistic multiplexing, it is code check required for encoder compresses and the novel relation resembled between content, when static multiplex device exports total bitrate, multiple video flowing is jointly controlled, reaches multiple video strems and reasonably share total bitrate as far as possible.
It must be encoder and multiplexer associated working, and encoder must have the function that dynamic code rate controls.
Another kind adds up multiplexing again, it is after analyzing TS stream (no matter coming wherefrom) of input, show that the novel composition that resembles of which ES is low speed this moment, which ES composition is at a high speed this moment, and then accordingly the carrying out of data in TS stream is processed, make low speed composition take lower bit rate, and high speed composition take high bit rate (performing virtual solution/cataloged procedure with this), and its total bit rate output is fixing, need not with encoder associated working.
Obviously after, property/valency of a kind of mode is than higher, it is reported and is about 1/5 of the former price.And after Compression device in a kind of mode can need not when bandwidth takes it easy.
In terminal, MBMS still inherits existing 3GPP standard to greatest extent, the technology such as terminal power consumption, storage, multi-media processing, display are improved while, is only the enhancing of original Base-Band Processing function.
Therefore, the MBMS terminal and the existing terminal that carry broadband multimedia services maintain good uniformity.
In bandwidth, MBMS can the speed of maximum use 256kbps carry out downloading and the transmission of Streaming Media, as long as and 128kbps just can support the sport category program that the novel picture of 15fps QCIF 176*144 and 12.2Kbps voice combine watches demand.
In interactive, MBMS itself does not define special up channel, but the Service control flow processs such as existing ascending control channel carries out service subscribing, business adds can be utilized, utilize reverse link traffic channel to realize the realization of some interaction services coordinated with downlink broadcast/multicast simultaneously.
In capacity, MBMS provides point-to-multipoint transmission multimedia transmit mechanism, the business model of so-called " Send Once; Charge Many times " is provided, the growth of resource consumption and number of users has nothing to do, thus for saving 3G network interface-free resources and Iub port transmission resource at full stretch, evade mobile network's capacity inferior position and searched out basic solution route.
Number of users is more, and the advantage of MBMS in capacity and cost plays more obvious; Few or when there is no user in multicast service at multicast user's number, network can be user's assigned with dedicated channel neatly or close multicast control channel, and the distinctive efficient resource administrative skill of these mobile networks more allows MBMS technology make something perfect even more perfect in capacity.
MBMS supports multi-media broadcasting service and multicast service two kinds of patterns, both multimedia video information can be broadcasted directly to all users, also one group of contracted user charged can be sent to watch, operator can be helped to carry out multimedia advertising, the free and multiple business application such as pay-television channels, multimedia message mass-sending.Operator just can carry out mobile phone TV services with lower network design cost.
From MBMS to the evolution of E-MBMS
Through long-term research and development, multimedia broadcast/group broadcast service (MBMS) has achieved complete realization in the 3G system of R6, R7 version, but still cannot meet growing business demand, especially user and operator are to the tight demand of mobile phone TV services.Along with R8 specification start formulate, on the one hand in order to improve the service feature of MBMS further, need on the other hand to adapt to new System Architecture Evolution/Long Term Evolution (SAE/LTE) system, MBMS has carried out significant improvement in logical architecture, business model, transmission means and channel architecture etc.By analysis and research, article illustrating in detail from existing MBMS(and R6/R7 MBMS with regard to these aspects) to the evolution process of evolutionary multimedia broadcast/multicast service (E-MBMS) (comprising SAE MBMS and LTE MBMS).
Multimedia broadcast/group broadcast service (MBMS) is that 3GPP is organized in the key property introduced in R6 version, it is a kind of point-to-multipoint business in order to realize transmitting from data source multiple user in particular range data simultaneously, thus make network (comprising core net and Access Network) resource be shared, be embodied as the user in a large number with same requirements with less resource provides business simultaneously.
Although through long-term research and development, MBMS has achieved complete realization in the 3G system of R6, R7 version, still cannot meet growing business demand, and especially user and operator are to the tight demand of mobile phone TV services.
Along with R8 specification start formulate, on the one hand in order to improve the service feature of MBMS further, need on the other hand to adapt to new System Architecture Evolution/Long Term Evolution (SAE/LTE) system, MBMS has carried out significant improvement in logical architecture, business model, transmission means and channel architecture etc.
Illustrating in detail from existing MBMS(and R6/R7 MBMS with regard to these aspects) to E-MBMS(and evolution version MBMS, comprise SAE MBMS and LTE MBMS) evolution process.
E-MBMS logical architecture
In R6/R7, comprise definition Gmb, Mz interface by increasing BM-SC(in 3G system), and provide MBMS to existing network entity increase MBMS function.
Therefore R6/R7 MBMS can be regarded as a kind of Function Extension to 3G system.
And in E-MBMS, provide complete logical architecture, comprise the MBMS logic entity defined in the core network and the dynamic management defined in Access Network (MCE) functional entity (referring to the 3rd part herein), and relevant chain of command, interface in the user plane.
This complete, independently logical architecture of E-MBMS, is convenient to carry out flexible deployment to MBMS functions, is conducive to resource optimization and the performance boost of MBMS.
EBM-SC is the BM-SC of evolution version, it not only has the function of BM-SC, can also select in use MBMS carrying (by SGmb, SGimb interface) or use between unicast bearer (by SGi interface), make eBM-SC have the ability for traffic performance and number of users to select rational bearer types like this.
Strengthen broadcast bearer type (referring to part 2 herein) owing to providing in E-MBMS, therefore UE may use unicast bearer to carry out registering/nullifying to eBM-SC.
In addition eBM-SC can also provide high level MBMS by unicast bearer to specific user.
MBMS is responsible for process by E-MBMS gateway in the core network, and it is made up of chain of command and user plane functions, and this two parts function may be implemented in different network entities.
User plane functions is responsible for the signaling (by SGmb and Sm interface) of asking of transfer eBM-SC and chain of command function on the one hand, be responsible on the other hand receiving the MBMS data (by SGimb interface) from eBM-SC, and by M1 interface to Access Network service data transmission.The synchronous transmission of M1 interface supported data frame, issues data in the mode of IP multicast.Chain of command function primary responsibility receives and process comes from the necessary information (as: IP multicast address for MBMS data transmission) that the session control signaling (as: session start, stopping) of the MBMS bearer service of eBM-SC and user plane functions provide, and carries out Signalling exchange by M3 interface and Access Network.
MBMS provides broadcast and multicast two kinds of bearer types.
When using broadcast bearer, business datum can send to all users in service area, and user just can receive data without the need to carrying out registering to network; And when using multicast bear, business datum is only transmitted to specific user, in order to receive business datum, user must register to network, and among interdependent node user profile being kept at network.
MBMS broadcast and multicast are the different bearer types provided for different business demands, have different operation flows.
Every MBMS all saves corresponding business information at BM-SC, and by service statement/discovery procedure (comprising the modes such as WAP, http and MMS), UE can obtain these business information.
The bearer types that this MBMS uses can be comprised in business information.When using MBMS multicast bear, business information also can provide to UE the call parameter adding multicast bear, as business multicast address, business time started etc.
MBMS broadcasts
When using MBMS broadcast bearer, due to not for specific user, therefore do not need to preserve user profile in BM-SC and network node.
Simultaneously because broadcasting service not comes from the wish of user, unless so carry out local activation, otherwise UE can't receive broadcast data veritably.
Carry out local activation, UE only needs according to the parametric description in business information, be tuned to corresponding channel just can carry out data receiver.
Before carrying out MBMS data transmission, because this business unpromising sets up carrying in a network, therefore must carry out informing network by BM-SC by session start message and obtain necessary bearing resource.
In Access Network, session start message also can trigger MBMS notification procedure, and notice UE is about to carry out MBMS data transmission.Afterwards, this MBMS data can be passed through set up broadcast bearer and issues.After the end of transmission, BM-SC can by session stop message informing network discharge shared by resource.
When using MBMS multicast bear, business datum only to those through to authorize and the user completing adition process is transmitted, therefore can be different from broadcast, needs to comprise subscription, add and departure process in multicast bear operation flow.User obtains the mandate of MBMS multicast service by subscribing to, corresponding user profile can be kept in BM-SC.
After user's initiation business, by the mandate of BM-SC, must can complete the adition process in bearer network, and UE information be saved in the correspondence group relation of interdependent node, such UE can receive this MBMS data.
On the contrary, user can carry out business termination, triggers the departure process of bearer network and stops receiving this business datum.
E-MBMS defines and strengthens broadcast bearer type, and this bearer types, between broadcast with multicast, absorbs the advantage of resource optimization in the simple and multicast of flow process in broadcast.
From operation flow, enhancing is broadcasted the subscription also comprised in multicast, is added and departure process, all needs for the registration and unregistration of specific MBMS bearer service realization from UE to BM-SC.
Unlike, adding of multicast needs to relate to bearer network network layers (GTP layer) with departure process, need UE information to be kept on the interdependent node of bearer network and (comprising: RNC, SGSN and GGSN), and become a part for this business multicast tree of bearer network.
And adding of enhancing broadcast is implemented in application layer with departure process, bearer network is non to this.
Therefore, for bearer network, strengthen broadcast closer to broadcast.
When using MBMS multicast bear, by sending IGMP/multicast communication audience in unicast bearer, user finds that (IGMP/MLD) adds message and initiate business, the GGSN receiving this message can authorize to BM-SC request, after obtaining the authorization, GGSN can initiate the adition process of bearer network network layers, UE information is joined in group membership's relation corresponding to interdependent node in bearer network.
Visible, the adding of multicast/departure process originates from IP layer and is implemented in bearer network network layers, therefore needs between the relevant network node of bearer network network layers, carry out complicated Signalling exchange.
When using E-MBMS to strengthen broadcast bearer, only need on the application layer by adding/departure process just can realize from UE to BM-SC registration/cancellation, without the need to carrying out Signalling exchange and information storage in bearer network network layers.Strengthen broadcast be to broadcast one optimization and expansion, as: at Access Network, strengthen broadcast can not to those do not receive user community send data.
E-MBMS introduces single frequency network (SFN) transmission means in Access Network, i.e. MBSFN transmission means, is exactly to carry out synchronous transmission with same frequency in multiple community at one time.
Use this transmission means to save frequency resource, improve the availability of frequency spectrum.
This multiple sectors at same keeps pouring in defeated brought diversity and can solve the problems such as blind area covering simultaneously, strengthens the reliability received, and improves coverage rate.
What relate to due to MBSFN transmission means is the synchronous transmission of multiple minizone, therefore needs to define the region of MBSFN transmission:
1) MBSFN retaining zone: refer to the region of having the ability to carry out MBSFN transmission, all eNodeB in this region can by synchronous and carry out MBSFN transmission.
2) MBSFN region: refer to one group of community by coordinating to achieve MBSFN transmission.For the UE receiving MBSFN transmission, whole MBSFN region can be counted as a MBSFN community.
3) obvious, MBSFN region must exceed the scope of MBSFN retaining zone.
Can comprise multiple MBSFN region in a MBSFN retaining zone, and the specific cell of MBSFN retaining zone also can belong to multiple different MBSFN region.
MBSFN retaining zone is generally realized by configuration, and MBSFN region both by configuration, also can be realized by MCE.
4) even if in same MBSFN region, due to different reception situations may be in MBSFN transmission, therefore can further little the dividing in MBSFN region be transmitted notice community, transmission community and be retained community.
Transmission is noticed community and is referred to that those can receive the community of transferring content and business information simultaneously, and in this community, UE can receive securely; Transmission community refers to that those can only receive transferring content and cannot receive the community of business information, and this community is generally positioned at the edge in MBSFN region, and effect is to ensure that the frequency interferences that community can not be subject to MBSFN region exterior is noticed in transmission; Retain community and refer to that those can not receive the community of this MBSFN transmission.
MBSFN transferring content is synchronous
The feature of MBSFN transmission means is the synchronous transmission of multiple cell, and what first need solution is content synchronization problem.
In order to ensure the synchronous transmission of radio frames, E-MBMS employs synchronous (SYNC) agreement on M1 interface (eNodeB with E-MBMS gateway customer face between).
E-MBMS gateway can carry SYNC information when carrying out transfer of data, and eNodeB can send radio frames according to these SYNC information.In addition, in order to ensure synchronous transmission, eNodeB needs to possess certain caching capabilities.
In MBSFN retaining zone, the SYNC information of all eNodeB is unified, and before carrying out MBSFN transmission, can be that all relevant eNodeB configure identical wireless spread-spectrum technology/medium education/physical layer (RLC/MAC/PHY) by MCE.
For specific MBMS transmission, can be responsible for sending MBMS data (by M1 interface) to all relevant eNodeB by specific E-MBMS gateway, E-MBMS gateway does not need the information knowing allocation of radio resources accurately, comprise precise time and distribute (as: accurate start time of radio frame transmission), only need in MBMS data, carry SYNC information.
(3) definition and application
" statistical time division multiplexing ", also known as " ATDM ".
It utilizes the method for common signal channel " time slot " different from traditional time-division multiplexing method, and each terminal of traditional time division multiplexing access is assigned with a time slot of a common signal channel regularly, sits in the right seat.Because terminal and time slot are " sitting in the right seat ", so they are " synchronously ".
And asynchronous time-division multiplex or STDM are that the time slot of common signal channel is carried out " distribution according to need ", namely only transmission information or the terminal that working is needed just to distribute to time slot to those, so just make all time slots be used fullly, the number of terminals of service can be made to be greater than the number of time slot, improve the utilance of medium, thus serve the effect of " multiplexing ".
At system aspects MBMS namely: model base management system
In 3G (Third Generation) Moblie field, so-called MBMS is then the abbreviation of " Multimedia Broadcast Multicast Service ", and Chinese name is " multimedia broadcast multi-broadcasting business ".
MBMS is the technology foundation stone of mobile phone TV services.
MBMS is the multimedia broadcasting and multicast function defined in 3GPP R6.MBMS standard operation started in 2002, and estimated to freeze in September, 2005, and real network is implemented to estimate in 2007.Before 2008,3G network can promote MBMS.
MBMS to the change that original WCDMA network is main is: increase BM-SC network element, MBMS function upgrading is carried out to existing PS territory related network elements, to support the peculiar interface function of MBMS (as Gmb), peculiar channel (as MICH, MTCH/MCCH/MSCH), peculiar physical layer procedure (merging of FACH channel selectivity, PTM and PTP switch) and peculiar operation flow (as subscribed to).
" statistic multiplexing " is in fact also the one of time-division multiplex technology.
Full name is called " statistical time division multiplexing ", is called for short STDM, statistical analysis, and the comparable traditional time division multiplexing of statistic multiplexing improves efficiency of transmission 2-4 doubly.
This multiplexing main feature is dynamically allocated channel time slot, so statistic multiplexing can be called " dynamic multiplexing " again.
(4) composition and composition
The evolution of MBMS logical architecture
MBMS framework
In R6/R7, MBMS function is by realizing the improvement of 3G network, and therefore MBMS framework will depend on existing 3G network framework.
Main improvement comprises two aspects: provide by increasing new functional entity broadcast multicast service center (BM-SC) and manage MBMS on the one hand; On existing functional entity, (comprising: GGSN, SGSN, BSC/RNC and UE) support increased MBMS on the other hand.
BM-SC can realize providing and management MBMS.For content providers, BM-SC is the entrance of MBMS content; For bearer network, BM-SC be responsible for authorize, initiate MBMS, and scheduling, MBMS transmission business tine.As the core functional entities of MBMS, BM-SC comprises 5 partial functions:
1) member relation function: be responsible for the subscription information of preserving user, MBMS added to UE and carries out authorisation process, and produce the station message recording.
2) session and transfer function: be responsible for initiating and stopping MBMS session, authorization identifying is carried out to outside content providers, and be responsible for receiving and sending MBMS data.
3) agency and forwarding capability: BM-SC is each function inner and gateway GSN(GGSN on a control plane) between carry out the agency of Signalling exchange, user face is session and transfer function to.
4) service statement function: be responsible for providing MBMS information to UE, comprises media specifier (as: video type, acoustic coding) and session specification (as: service identification, address, reproduction time).
5) safety function: for MBMS data provides integrality and privacy protection, provide key to the UE obtaining MBMS mandate.
BM-SC realizes the control to MBMS by two chain of command interfaces (Gmb interface, Mz interface).
Wherein Gmb interface supports the Signalling exchange between GGSN and BM-SC, is the edge of MBMS bearer service; Mz interface is supported between different BM-SC and carries out Signalling exchange, for MBMS provides the ability across BM-SC roaming.
On these two interfaces, mutual signaling comprises: MBMS carrying relevant (as: MBMS session start, stopping) relevant with MBMS user (as: mandate, MBMS activate) two classes.In addition BM-SC transmits MBMS data by Gi interface.
Claims (8)
1. the novel e-MBMS system of the statistic multiplexing of radio frequency remote equipment that utilizes is encoder and multiplexer associated working, and encoder must have the function that dynamic code rate controls;
Another kind adds up multiplexing again, it is after analyzing TS stream (no matter coming wherefrom) of input, show which ES image component is low speed this moment, which ES composition is at a high speed this moment, and then accordingly the carrying out of data in TS stream is processed, make low speed composition take lower bit rate, and high speed composition take high bit rate (performing virtual solution/cataloged procedure with this), and its total bit rate output is fixing, need not with encoder associated working;
Obviously after, property/valency of a kind of mode is than higher, it is reported and is about 1/5 of the former price; And after Compression device in a kind of mode can need not when bandwidth takes it easy;
In terminal, MBMS still inherits existing 3GPP standard to greatest extent, the technology such as terminal power consumption, storage, multi-media processing, display are improved while, is only the enhancing of original Base-Band Processing function.
2. the MBMS terminal and the existing terminal that therefore, carry broadband multimedia services maintain good uniformity;
In bandwidth, MBMS can the speed of maximum use 256kbps carry out downloading and the transmission of Streaming Media, as long as and 128kbps just can support the demand of watching of the sport category program that 15fps QCIF 176*144 image and 12.2Kbps voice combine;
In interactive, MBMS itself does not define special up channel, but the Service control flow processs such as existing ascending control channel carries out service subscribing, business adds can be utilized, utilize reverse link traffic channel to realize the realization of some interaction services coordinated with downlink broadcast/multicast simultaneously;
In capacity, MBMS provides point-to-multipoint transmission multimedia transmit mechanism, the business model of so-called " Send Once; Charge Many times " is provided, the growth of resource consumption and number of users has nothing to do, thus for saving 3G network interface-free resources and Iub port transmission resource at full stretch, evade mobile network's capacity inferior position and searched out basic solution route;
Number of users is more, and the advantage of MBMS in capacity and cost plays more obvious; Few or when there is no user in multicast service at multicast user's number, network can be user's assigned with dedicated channel neatly or close multicast control channel, and the distinctive efficient resource administrative skill of these mobile networks more allows MBMS technology make something perfect even more perfect in capacity;
MBMS supports multi-media broadcasting service and multicast service two kinds of patterns, both multimedia video information can be broadcasted directly to all users, also one group of contracted user charged can be sent to watch, operator can be helped to carry out multimedia advertising, the free and multiple business application such as pay-television channels, multimedia message mass-sending; Operator just can carry out mobile phone TV services with lower network design cost;
From MBMS to the evolution of E-MBMS
Through long-term research and development, multimedia broadcast/group broadcast service (MBMS) has achieved complete realization in the 3G system of R6, R7 version, but still cannot meet growing business demand, especially user and operator are to the tight demand of mobile phone TV services; Along with R8 specification start formulate, on the one hand in order to improve the service feature of MBMS further, need on the other hand to adapt to new System Architecture Evolution/Long Term Evolution (SAE/LTE) system, MBMS has carried out significant improvement in logical architecture, business model, transmission means and channel architecture etc.; By analysis and research, article illustrating in detail from existing MBMS(and R6/R7 MBMS with regard to these aspects) to the evolution process of evolutionary multimedia broadcast/multicast service (E-MBMS) (comprising SAE MBMS and LTE MBMS);
Multimedia broadcast/group broadcast service (MBMS) is that 3GPP is organized in the key property introduced in R6 version, it is a kind of point-to-multipoint business in order to realize transmitting from data source multiple user in particular range data simultaneously, thus make network (comprising core net and Access Network) resource be shared, be embodied as the user in a large number with same requirements with less resource provides business simultaneously;
Although through long-term research and development, MBMS has achieved complete realization in the 3G system of R6, R7 version, still cannot meet growing business demand, and especially user and operator are to the tight demand of mobile phone TV services;
Along with R8 specification start formulate, on the one hand in order to improve the service feature of MBMS further, need on the other hand to adapt to new System Architecture Evolution/Long Term Evolution (SAE/LTE) system, MBMS has carried out significant improvement in logical architecture, business model, transmission means and channel architecture etc.
3. illustrating in detail from existing MBMS(and R6/R7 MBMS with regard to these aspects) to E-MBMS(and evolution version MBMS, comprise SAE MBMS and LTE MBMS) evolution process;
E-MBMS logical architecture
In R6/R7, comprise definition Gmb, Mz interface by increasing BM-SC(in 3G system), and provide MBMS to existing network entity increase MBMS function;
Therefore R6/R7 MBMS can be regarded as a kind of Function Extension to 3G system;
And in E-MBMS, provide complete logical architecture, comprise the MBMS logic entity defined in the core network and the dynamic management defined in Access Network (MCE) functional entity (referring to the 3rd part herein), and relevant chain of command, interface in the user plane;
This complete, independently logical architecture of E-MBMS, is convenient to carry out flexible deployment to MBMS functions, is conducive to resource optimization and the performance boost of MBMS;
EBM-SC is the BM-SC of evolution version, it not only has the function of BM-SC, can also select in use MBMS carrying (by SGmb, SGimb interface) or use between unicast bearer (by SGi interface), make eBM-SC have the ability for traffic performance and number of users to select rational bearer types like this.
4. strengthen broadcast bearer type (referring to part 2 herein) owing to providing in E-MBMS, therefore UE may use unicast bearer to carry out registering/nullifying to eBM-SC;
In addition eBM-SC can also provide high level MBMS by unicast bearer to specific user;
MBMS is responsible for process by E-MBMS gateway in the core network, and it is made up of chain of command and user plane functions, and this two parts function may be implemented in different network entities;
User plane functions is responsible for the signaling (by SGmb and Sm interface) of asking of transfer eBM-SC and chain of command function on the one hand, be responsible on the other hand receiving the MBMS data (by SGimb interface) from eBM-SC, and by M1 interface to Access Network service data transmission; The synchronous transmission of M1 interface supported data frame, issues data in the mode of IP multicast; Chain of command function primary responsibility receives and process comes from the necessary information (as: IP multicast address for MBMS data transmission) that the session control signaling (as: session start, stopping) of the MBMS bearer service of eBM-SC and user plane functions provide, and carries out Signalling exchange by M3 interface and Access Network;
MBMS provides broadcast and multicast two kinds of bearer types;
When using broadcast bearer, business datum can send to all users in service area, and user just can receive data without the need to carrying out registering to network; And when using multicast bear, business datum is only transmitted to specific user, in order to receive business datum, user must register to network, and among interdependent node user profile being kept at network;
MBMS broadcast and multicast are the different bearer types provided for different business demands, have different operation flows;
Every MBMS all saves corresponding business information at BM-SC, and by service statement/discovery procedure (comprising the modes such as WAP, http and MMS), UE can obtain these business information;
Novelly utilize in the e-MBMS system business information of the statistic multiplexing of radio frequency remote equipment the bearer types that can comprise this MBMS and use; When using MBMS multicast bear, business information also can provide to UE the call parameter adding multicast bear, as business multicast address, business time started etc.;
MBMS broadcasts
When using MBMS broadcast bearer, due to not for specific user, therefore do not need to preserve user profile in BM-SC and network node;
Simultaneously because broadcasting service not comes from the wish of user, unless so carry out local activation, otherwise UE can't receive broadcast data veritably;
The novel e-MBMS system of the statistic multiplexing of radio frequency remote equipment that utilizes carries out local activation, and UE only needs according to the parametric description in business information, be tuned to corresponding channel just can carry out data receiver;
Before carrying out MBMS data transmission, because this business unpromising sets up carrying in a network, therefore must carry out informing network by BM-SC by session start message and obtain necessary bearing resource.
5. in Access Network, session start message also can trigger MBMS notification procedure, and notice UE is about to carry out MBMS data transmission; Afterwards, this MBMS data can be passed through set up broadcast bearer and issues; After the end of transmission, BM-SC can by session stop message informing network discharge shared by resource;
When using MBMS multicast bear, business datum only to those through to authorize and the user completing adition process is transmitted, therefore can be different from broadcast, needs to comprise subscription, add and departure process in multicast bear operation flow; User obtains the mandate of MBMS multicast service by subscribing to, corresponding user profile can be kept in BM-SC;
After user's initiation business, by the mandate of BM-SC, must can complete the adition process in bearer network, and UE information be saved in the correspondence group relation of interdependent node, such UE can receive this MBMS data;
On the contrary, user can carry out business termination, triggers the departure process of bearer network and stops receiving this business datum;
E-MBMS defines and strengthens broadcast bearer type, and this bearer types, between broadcast with multicast, absorbs the advantage of resource optimization in the simple and multicast of flow process in broadcast;
From operation flow, enhancing is broadcasted the subscription also comprised in multicast, is added and departure process, all needs for the registration and unregistration of specific MBMS bearer service realization from UE to BM-SC.
6. unlike, adding of multicast needs to relate to bearer network network layers (GTP layer) with departure process, need UE information to be kept on the interdependent node of bearer network and (comprising: RNC, SGSN and GGSN), and become a part for this business multicast tree of bearer network;
And adding of enhancing broadcast is implemented in application layer with departure process, bearer network is non to this;
Therefore, for bearer network, strengthen broadcast closer to broadcast;
When using MBMS multicast bear, by sending IGMP/multicast communication audience in unicast bearer, user finds that (IGMP/MLD) adds message and initiate business, the GGSN receiving this message can authorize to BM-SC request, after obtaining the authorization, GGSN can initiate the adition process of bearer network network layers, UE information is joined in group membership's relation corresponding to interdependent node in bearer network;
Visible, the adding of multicast/departure process originates from IP layer and is implemented in bearer network network layers, therefore needs between the relevant network node of bearer network network layers, carry out complicated Signalling exchange;
When using E-MBMS to strengthen broadcast bearer, only need on the application layer by adding/departure process just can realize from UE to BM-SC registration/cancellation, without the need to carrying out Signalling exchange and information storage in bearer network network layers; Strengthen broadcast be to broadcast one optimization and expansion, as: at Access Network, strengthen broadcast can not to those do not receive user community send data;
E-MBMS introduces single frequency network (SFN) transmission means in Access Network, i.e. MBSFN transmission means, is exactly to carry out synchronous transmission with same frequency in multiple community at one time;
Use this transmission means to save frequency resource, improve the availability of frequency spectrum;
This multiple sectors at same keeps pouring in defeated brought diversity and can solve the problems such as blind area covering simultaneously, strengthens the reliability received, and improves coverage rate.
7. novel what utilize the e-MBMS system of the statistic multiplexing of radio frequency remote equipment to relate to due to MBSFN transmission means is the synchronous transmission of multiple minizone, therefore needs to define the region of MBSFN transmission:
MBSFN retaining zone: refer to the region of having the ability to carry out MBSFN transmission, all eNodeB in this region can by synchronous and carry out MBSFN transmission;
MBSFN region: refer to one group of community by coordinating to achieve MBSFN transmission; For the UE receiving MBSFN transmission, whole MBSFN region can be counted as a MBSFN community;
Obviously, MBSFN region must exceed the scope of MBSFN retaining zone;
Can comprise multiple MBSFN region in a MBSFN retaining zone, and the specific cell of MBSFN retaining zone also can belong to multiple different MBSFN region;
MBSFN retaining zone is generally realized by configuration, and MBSFN region both by configuration, also can have been realized by MCE;
Even if in same MBSFN region, due to different reception situations may be in MBSFN transmission, therefore can further little the dividing in MBSFN region be transmitted notice community, transmission community and be retained community;
Transmission is noticed community and is referred to that those can receive the community of transferring content and business information simultaneously, and in this community, UE can receive securely; Transmission community refers to that those can only receive transferring content and cannot receive the community of business information, and this community is generally positioned at the edge in MBSFN region, and effect is to ensure that the frequency interferences that community can not be subject to MBSFN region exterior is noticed in transmission; Retain community and refer to that those can not receive the community of this MBSFN transmission;
MBSFN transferring content is synchronous
The feature of MBSFN transmission means is the synchronous transmission of multiple cell, and what first need solution is content synchronization problem;
In order to ensure the synchronous transmission of radio frames, E-MBMS employs synchronous (SYNC) agreement on M1 interface (eNodeB with E-MBMS gateway customer face between);
E-MBMS gateway can carry SYNC information when carrying out transfer of data, and eNodeB can send radio frames according to these SYNC information; In addition, in order to ensure synchronous transmission, eNodeB needs to possess certain caching capabilities;
The novel e-MBMS system of the statistic multiplexing of radio frequency remote equipment that utilizes is in MBSFN retaining zone, the SYNC information of all eNodeB is unified, and before carrying out MBSFN transmission, can be that all relevant eNodeB configure identical wireless spread-spectrum technology/medium education/physical layer (RLC/MAC/PHY) by MCE;
For specific MBMS transmission, can be responsible for sending MBMS data (by M1 interface) to all relevant eNodeB by specific E-MBMS gateway, E-MBMS gateway does not need the information knowing allocation of radio resources accurately, comprise precise time and distribute (as: accurate start time of radio frame transmission), only need in MBMS data, carry SYNC information.
8.BM-SC can realize providing and management MBMS; For content providers, BM-SC is the entrance of MBMS content; For bearer network, BM-SC be responsible for authorize, initiate MBMS, and scheduling, MBMS transmission business tine; As the core functional entities of MBMS, BM-SC comprises 5 partial functions:
Member relation function: be responsible for the subscription information of preserving user, MBMS added to UE and carries out authorisation process, and produce the station message recording;
Session and transfer function: be responsible for initiating and stopping MBMS session, authorization identifying is carried out to outside content providers, and be responsible for receiving and sending MBMS data;
Agency and forwarding capability: BM-SC is each function inner and gateway GSN(GGSN on a control plane) between carry out the agency of Signalling exchange, user face is session and transfer function to;
Service statement function: be responsible for providing MBMS information to UE, comprises media specifier (as: video type, acoustic coding) and session specification (as: service identification, address, reproduction time);
Safety function: for MBMS data provides integrality and privacy protection, provide key to the UE obtaining MBMS mandate;
BM-SC realizes the control to MBMS by two chain of command interfaces (Gmb interface, Mz interface);
Wherein Gmb interface supports the Signalling exchange between GGSN and BM-SC, is the edge of MBMS bearer service; Mz interface is supported between different BM-SC and carries out Signalling exchange, for MBMS provides the ability across BM-SC roaming;
On these two interfaces, mutual signaling comprises: MBMS carrying relevant (as: MBMS session start, stopping) relevant with MBMS user (as: mandate, MBMS activate) two classes; In addition BM-SC transmits MBMS data by Gi interface.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106506411A (en) * | 2015-09-07 | 2017-03-15 | 普天信息技术有限公司 | Uplink data transmission method and base station |
| WO2018035659A1 (en) * | 2016-08-22 | 2018-03-01 | 武汉芯泰科技有限公司 | Ip over rf network system |
| CN109952778A (en) * | 2016-11-15 | 2019-06-28 | 华为技术有限公司 | Support method, MCE, base station and the terminal of eMBMS |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106506411A (en) * | 2015-09-07 | 2017-03-15 | 普天信息技术有限公司 | Uplink data transmission method and base station |
| WO2018035659A1 (en) * | 2016-08-22 | 2018-03-01 | 武汉芯泰科技有限公司 | Ip over rf network system |
| CN109952778A (en) * | 2016-11-15 | 2019-06-28 | 华为技术有限公司 | Support method, MCE, base station and the terminal of eMBMS |
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