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Patent Issued for Evolved Multimedia Broadcast Multicast Service System and Method for Performing Statistical Multiplexing of Services with Different...

July 22, 2014



Patent Issued for Evolved Multimedia Broadcast Multicast Service System and Method for Performing Statistical Multiplexing of Services with Different Quality of Service Class Identifiers

By a News Reporter-Staff News Editor at Journal of Technology -- Alcatel Lucent (Paris, FR) has been issued patent number 8773983, according to news reporting originating out of Alexandria, Virginia, by VerticalNews editors.

The patent's inventor is Chen, Yu (Shanghai, CN).

This patent was filed on August 11, 2009 and was published online on July 8, 2014.

From the background information supplied by the inventors, news correspondents obtained the following quote: "Today, with the rapid development of mobile technology, a large number of multimedia services emerge. In some application services, multiple users can simultaneously receive the same data, such as video on demand, television broadcast, video conference, mobile TV, etc. In order to efficiently utilize mobile network resources, WCDMA/GSM global standardization organization 3GPP puts forward a Multimedia Broadcast Multicast Service (MBMS)/an evolved Multimedia Broadcast Multicast Service (e-MBMS). The MBMS/e-MBMS refers to a point-to-multipoint service in which data are transmitted from a single data source to multiple users to share network resources. The MBMS/e-MBMS defined by 3GPP enables not only multicast and broadcast of plain text, low rate messages, but also multicast and broadcast of high-rate multimedia services, which undoubtedly conforms to the development trend of future mobile data.

"In addition, statistical multiplexing technology is widely used in a multi-stream transmission system. Multiplexing parallel streams results in considerable a multiplexing gain. The multiplexing gain is achieved by statistics of services, i.e. when one of the streams needs more bandwidths, some other streams will statistically undergo a low bit rate state. Statistical multiplexing is applicable to a broadcasting system because a gain is achieved by utilizing application statistics characters rather than others like physical layer feedback. The multiplexing gain is quite considerable, e.g. it has been found that a gain of 30%-40% can be achieved in DVB-H.

"Thus, it is necessary to perform statistical multiplexing in the MBMS/e-MBMS system to achieve higher efficiency of resource utilization.

"The basic concept of performing statistical multiplexing of the services with the same Quality of Service Class Identifier (QCI) has been proposed.

"FIG. 1 illustrates a schematic diagram of the existing evolved Multimedia Broadcast Multicast Service (e-MBMS) system for performing statistical multiplexing of services with the same QCI.

"QCI comprises parameters such as bit rate, bit error rate, requirement on delay and priority level required by achieving the Quality of Service Level of services.

"An evolved Broadcast Multicast Service Center (eBM-SC) achieves provision and management of the MBMS service. For a content provider, BM-SC is an entrance of the MBMS service content. For a bearer network, eBM-SC is in charge of authorizing and initiating e-MBMS services/and scheduling and transmitting e-MBMS service contents.

"As shown in FIG. 1, eBM-SC firstly acquires statistical parameters of services with the same QCI, and determines a statistical multiplexing bundle and information of the statistical multiplexing bundle, wherein the information of the statistical multiplexing bundle may include: a list of services within the bundle represented for example by a list of a Temporal Mobile Group Identify (TMGI), the QCI requested by the statistical multiplexing bundle and the Aggregated Bundle Bit

"Rate (ABBR) of the statistical multiplexing bundle. Then, eBM-SC informs an encoder of the ABBR so that the encoder can make joint encoding of multiple services in the aggregated bundle; the total code rate of data streams of multiple services can keep constant; and these services can rationally share the total code rate. The eBM-SC transmits the information of the statistical multiplexing bundle via a gateway to MBMS

"Collaborative Entity (MCE) so that the MCE can perform resource allocation. On the allocated resources, via MAC multiplexing, eNodeB multiplexes IP packets to the same Transmission Block (TB) to multiplex the services to the same Multicast Channel (MCH).

"FIG. 2 illustrates a schematic diagram of the existing method for performing statistical multiplexing of the services with the same QCI.

"For a case including service stream 1 (QCI1), service stream 2 (QCI1), service stream 3 (QCI2), service stream 4 (QCI3) and service stream 5 (QCI4), eBM-SC firstly determines statistical multiplexing bundle 1 {service stream 1 (QCI1), service stream 2 (QCI1)}, statistical multiplexing bundle 2; {service stream 3 (QCI2)}, statistical multiplexing bundle 3 {service stream 4 (QCI3)} and statistical multiplexing bundle 4 {service stream 5 (QCI4)} and their respective ABBRs.sub.bundle (ABBRs of the statistical multiplexing bundles), and controls the encoder to perform encoding. Based on the statistical multiplexing bundle 1 {service stream 1 (QCI1), service stream 2 (QCI1)}, statistical multiplexing bundle 2 {service stream 3 (QCI2)}, statistical multiplexing bundle 3 {service stream 4 (QCI3)} and statistical multiplexing bundle 4 {service stream 5 (QCI4)} and their respective ABBRs.sub.bundle determined by the eBM-SC, MCE performs resource allocation and allocates services of different bundles to different MCHs.

"The signaling structure employed by the method is as follows:

"TABLE-US-00001 Session start{ Bundle ID list { ABBR.sub.bundle { TMGI list } } } Session update{ Bundle ID list { ABBR.sub.bundle { TMGI list } } }

"A study has found that the output of the joint encoded multiplexing stream of services with the same QCI is similar to a Constant Bit Rate (CBR) service. FIG. 3 is a schematic diagram illustrating the relationship between the allocated bit rate and the real-time bit rate of the CBR service. As shown in FIG. 3, a study result shows that the real-time bit rate of CBR is not constant, but with some changes, which however, will further provide a multiplexing gain.

"FIG. 4 is a simulation chart illustrating the multiplexing gain of 4 CBR services. As shown in FIG. 4, the multiplexing gain of 4 CBR services may approach 16%. For a 5M bandwidth, it is equivalent to 800 Kbps. The inventor of the present invention has recognized that the multiplexing gain of multiple CBR services is quite considerable.

"Hence, the inventor arrives at the following findings:

"Accordingly, there is provided an evolved Multimedia Broadcast Multicast Service system and method for performing statistical multiplexing of services with different QCIs to further increase the system capacity."

Supplementing the background information on this patent, VerticalNews reporters also obtained the inventor's summary information for this patent: "It is an object of the present invention to perform effective statistical multiplexing of the services with different QCIs in an evolved Multimedia Broadcast Multicast Service (e-MBMS) system to further improve the efficiency of the system.

"According to one aspect of the present invention, there is provided a method for performing statistical multiplexing of services with different Quality of Service Class Identifiers (QCIs) in an evolved Multimedia Broadcast Multicast Service (e-MBMS) system, comprising: at an evolved Broadcast Multicast Service Center (eBM-SC), determining a statistical multiplexing bundle and information of the statistical multiplexing bundle for e-MBMS services, wherein the statistical multiplexing bundle is constituted by multiple services with different QCIs, and services with the same QCI constitute a statistical multiplexing sub-bundle in the statistical multiplexing bundle, the information of the statistical multiplexing bundle comprising: a QCI, a service list and an Aggregated Bundle Bit Rate (ABBR) of each statistical multiplexing sub-bundle, and the ABBR of the statistical multiplexing bundle; at an MBMS Collaborative Entity (MCE), determining an ABBR bundle based on the information of the statistical multiplexing bundle determined by eBM-SC and according to a predetermined standard, and performing statistical multiplexing scheduling for the services of the ABBR bundle so that multiple services belonging to the same ABBR bundle share resources allocated to the ABBR bundle.

"Preferably, the eBM-SC determines the statistical multiplexing bundle according to the following condition: services have the same requirement on bit error rate.

"Preferably, the MCE determines the ABBR bundle according to the following standards: 1) services have the same priority level; and/or 2) services have the same requirement on delay.

"Preferably, the eBM-SC transmits the information of the statistical multiplexing bundle via a gateway to the MCE by a Session Start message.

"Preferably, the eBM-SC is configurable to add a new service to an existing statistical multiplexing bundle, and/or to remove a completed service from the existing statistical multiplexing bundle.

"Preferably, in the case that a service is added or removed, at the eBM-SC, the information of the statistical multiplexing bundle is re-determined and is transmitted to the MCE, and at the MCE, the ABBR bundle is re-determined.

"Preferably, the eBM-SC informs the MCE of service addition/removal by a Session Start/Session Stop message.

"Preferably, the eBM-SC transmits the re-determined information of the statistical multiplexing bundle to MCE by a Session Update message.

"According to a second aspect of the present invention, there is provided an evolved Multimedia Broadcast Multicast Service (e-MBMS) system, comprising: an evolved Broadcast Multicast Service Center (eBM-SC) configured to determine a statistical multiplexing bundle and information of the statistical multiplexing bundle for e-MBMS services, wherein the statistical multiplexing bundle comprises multiple services with different QCIs, and services with the same QCI constitute a statistical multiplexing sub-bundle in the statistical multiplexing bundle, the information of the statistical multiplexing bundle comprising: a QCI, a service list and an Aggregated Bundle Bit Rate (ABBR) of each statistical multiplexing sub-bundle, and an ABBR of the statistical multiplexing bundle; and an MBMS Collaborative Entity (MCE) configured to determine an ABBR bundle based on the information of the statistical multiplexing bundle determined by eBM-SC and according to the predetermined standard, and to perform statistical multiplexing scheduling for the services of the ABBR bundle so that the multiple services belonging to the same ABBR bundle share resources allocated to the ABBR bundle.

"Preferably, the eBM-SC comprises: a parameter acquiring means configured to acquire a statistical parameter of the eMBMS service; and a statistical multiplexing bundle and information of the statistical multiplexing bundle determining means configured to determine a statistical multiplexing bundle and information of the statistical multiplexing bundle in accordance with the statistical parameter acquired by the parameter acquiring means.

"Preferably, the eBM-SC further comprises: an encoder coordination means configured to perform rate control coordination between application encoders for services.

"Preferably, the MCE comprises: a parameter extracting means configured to extract the QCI, the service list and the Aggregated Bundle Bit Rate (ABBR) of a statistical multiplexing sub-bundle, and the ABBR of the statistical multiplexing bundle; and an ABBR bundle multiplexing means configured to determine an ABBR bundle based on the parameter extracted by the parameter extracting means and according to the predetermined standard, and to perform statistical multiplexing scheduling for the services of the ABBR bundle so that multiple services belonging to the same ABBR bundle share the resources allocated to the ABBR bundle.

"Preferably, the eBM-SC determines the statistical multiplexing bundle according to the following condition: services have the same requirement on bit error rate.

"Preferably, the MCE determines the ABBR bundle according to the following standards: 1) services have the same priority level; and/or 2) services have the same requirement on delay.

"Preferably, the eBM-SC transmits the information of the statistical multiplexing bundle via a gateway to the MCE by a Session Start message; the eBM-SC informs MCE of service addition/removal by a Session Start/Session Stop message; and/or the eBM-SC transmits the re-determined information of the statistical multiplexing bundle to the MCE by a Session Update message.

"Preferably, the e-MBMS system is a mobile TV system.

"By using the solution of the present invention, resources can be shared among services with different QCIs to further increase the system capacity."

For the URL and additional information on this patent, see: Chen, Yu. Evolved Multimedia Broadcast Multicast Service System and Method for Performing Statistical Multiplexing of Services with Different Quality of Service Class Identifiers. U.S. Patent Number 8773983, filed August 11, 2009, and published online on July 8, 2014. Patent URL: http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.htm&r=1&f=G&l=50&s1=8773983.PN.&OS=PN/8773983RS=PN/8773983

Keywords for this news article include: Technology, Alcatel Lucent.

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Source: Journal of Technology


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