US20120182922A1 - Method for performing synchronisation for multicast broadcast services in a wireless access communication network, corresponding multicast broadcast server and base station - Google Patents
Method for performing synchronisation for multicast broadcast services in a wireless access communication network, corresponding multicast broadcast server and base station Download PDFInfo
- Publication number
- US20120182922A1 US20120182922A1 US13/433,632 US201213433632A US2012182922A1 US 20120182922 A1 US20120182922 A1 US 20120182922A1 US 201213433632 A US201213433632 A US 201213433632A US 2012182922 A1 US2012182922 A1 US 2012182922A1
- Authority
- US
- United States
- Prior art keywords
- data
- mbs
- base station
- downlink frame
- base stations
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
- H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
- H04B7/2662—Arrangements for Wireless System Synchronisation
- H04B7/2665—Arrangements for Wireless Frequency Division Multiple Access [FDMA] System Synchronisation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0003—Two-dimensional division
- H04L5/0005—Time-frequency
- H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0037—Inter-user or inter-terminal allocation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0091—Signaling for the administration of the divided path
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
- H04W84/04—Large scale networks; Deep hierarchical networks
Definitions
- the present invention relates to method for performing synchronization for multicast broadcast services in a wireless access communication network.
- Wireless broadband access communication systems as for example WIMAX systems, foresee the support of multicast/broadcast services as defined in IEEE 802.16e-2005 standard. More precisely, some globally defined service flows may carry broadcast or multicast information that should be delivered to a plurality of end user stations. Since a multicast or broadcast transport connection is associated with a service flow, it is associated with the QoS and traffic parameters for that service flow.
- MBS multicast and broadcast services
- Single-BS access is implemented over multicast and broadcast transport connections within one base station
- multi-BS access is implemented by transmitting data from Service Flow(s) over multiple base stations.
- a user terminal may support both Single-BS and Multi-BS access. Initiation of MBS with respect to specific user terminals is always performed in registered state by creation of multicast connection carrying MBS data. During such initiation the user terminal learns the Service Flow ID that identifies the service.
- each base station capable of providing MBS belongs to a certain MBS Zone, which is a set of base stations where the same Connection Identifier (CID) is used for transmitting content of certain Service Flow(s).
- MBS Zone is identified by a unique MBS_ZONE identifier.
- CID Connection Identifier
- MBS Zone is identified by a unique MBS_ZONE identifier.
- all user terminals successfully registered can receive on the cell the MAC PDUs of the multicast and broadcast content that multiple base stations transmit anywhere under the given time period. It requires the multiple base station participating in same Multi-BS-MBS service to be synchronized in the transmissions of common multicast/broadcast data.
- the CID used for a multi-BS-MBS connection shall be the same for all base stations and user terminals on the same channel that participate in the connection.
- Multicast service synchronized across multiple base station enables a user terminal to receive the multicast or broadcast transmission from multiple base station, and thereby improve the reliability of reception using macro diversity.
- MBS transmission in a group of base station should be synchronized.
- each base station shall transmit the same PDUs, using the same transmission mechanism (symbol, subchannel, modulation, and etc.) at the same time.
- the way that multiple base stations accomplish the synchronized transmission (which implies performing functions like classification, fragmentation, scheduling at a centralized point called the MBS Server) is of primary importance for a properly working system.
- the same packets may be received at very different time at the different base stations from the network side. Consequently, the base station may include the same packet in two different PDUs, generating completely different MBS portions at different base stations and rendering the use of macro diversity impossible at receiver side.
- a particular object of the present invention is to provide a method for appropriate synchronization for multicast and broadcast services in wireless broadband access networks.
- Another object of the present invention is to provide a multicast and broadcast server in accordance with the method.
- Another object of the invention is to provide a corresponding base station in accordance with the method.
- the structure of the data to be synchronised in the downlink frame should be transmitted to all base stations of a predefined zone by a centralised server. More precisely, the server sends signaling messages comprising parameters guarantying an unified structure of the data to be synchronised for all base stations belonging to the predefined zone.
- Parameters of the message address preferably the position and size of the data to be synchronised in the frame, further parameters address the size and position of the bursts inside the data and further parameters address the position and the size of the different PDUs in the bursts.
- the method according to the present invention presents the advantage to provide a centralised synchronisation functionality.
- Another advantage of the present invention is that there is no need for transporting physical and MAC layer related information (as header and additional overhead) to the base stations but only the signaling message on a per frame basis.
- the physical and MAC layer related information are generated at the base stations and forwarded to the mobile terminals over the wireless interface.
- FIG. 1 illustrates an access network gateway in which the present invention may be implemented
- FIG. 2 illustrates a downlink frame structure comprising data to be synchronized according to the present invention
- FIG. 3 illustrates a server according to the present invention
- FIG. 4 illustrates a base station according to the present invention.
- FIG. 1 illustrates an access network in which the present invention may be implemented.
- the access network comprises an access network gateway 11 and base stations 12 connected either by fixed links or wireless links to access network gateway 11 .
- Access network gateway 11 is connected to the core network while base stations 12 are serving user terminals 13 which are preferably mobile.
- the data to be synchronized are preferably broadcast or multicast data. The description will be may accordingly. It will be clear for a person skilled in the art that the present invention may apply to other types of data to be synchronized.
- Access network gateway comprises a Multicast Broadcast Service (MBS) server 111 according to the present invention and base stations 12 comprise a MBS client 121 according to the present invention.
- MBS server is a central entity of the access network which may be either collocated to the access network gateway or stand alone or collocated to any other central access network entity.
- MBS server 111 sends messages to MBS clients 121 indicating the structure of each downlink frame to be further sent to user terminal 13 over the air interface. This enables it to send at base stations 12 completely synchronized data over the air interface towards the user terminals enabling them to perform macro diversity when receiving MBS data from different base stations in case MBS-multi base station service is available in the network.
- MBS data which are IP packets would be encapsulated at the base stations 12 without any coordination. Consequently, the contents of the frames sent simultaneously by the different base stations 12 could be different since the schedulers run independently and every scheduler generates a individual downlink frame which differs from the downlink frames of its neighbors. Then, it would impossible for user terminal 13 usually performing macrodiversity to use this feature for MBS services.
- all base stations 12 in one MBS zone have to generate unique multicast and broadcast portions inside the downlink frames.
- the MBS portion is a reserved space inside a downlink frame exclusively for MBS connections.
- all base stations in one MBS zone have to be forced to generate a MBS zone wide unique MBS portion.
- MBS server 11 sends messages to all base stations 12 in one MBS zone. These messages contain information that gives the base stations the opportunity to generate MBS zone wide unique MBS portions. The messages are transported between MBS server 11 and base stations 12 via the IP protocol.
- base stations 12 shortly store the received MBS data and organize them sub sequentially according to the signaled frame structure.
- the signaling message is sent from the MBS server which has the knowledge of the MBS data at a centralized point of the access network and which could in advance determine the organization of the frames containing MBS data which will be sent over the wireless air interface.
- FIG. 2 illustrates a downlink frame structure according to the present invention.
- a downlink frame comprising MBS data comprises a MBS portion 21 , which itself comprises several bursts 22 , each burst 22 comprises several MAC PDUs.
- the message sent by the MBS server to the base stations should comprise an indication on the size and position of the MBS zone in the downlink frame and/or indication on the size and position of the different bursts in the MBS portion and/or a indication on the size and position of the different MAC PDUs in the different bursts.
- This signaling message may be sent on a per downlink frame basis. Some parameters of the message as the size and position of the MBS portion may be sent only once at connection establishment if the size and position of the MBS portion is fixed for the duration of the connection. Alternatively if the size and position of the MBS portion is dynamically varying, this information should also be provided on a per frame basis.
- the downlink frame has a time and frequency extension as it is the case in OFDMA based wireless access networks as WIMAX.
- the bursts which can be defined as a part of the downlink frame using the same physical parameters such as modulation and coding schemes, are rectangular in their time/frequency extension. This would have the advantage to reduce the load of the signaling for defining the size and position of the bursts. Consequently, only the parameter as the first symbol of the burst, its time extension and its frequency extension need to be transmitted in the signaling message.
- the MAC PDUs which are the protocol data units of the medium access control layer, they may be preferably arranged in a burst so as to first extend in the time direction and then in the frequency direction. To this extend parameter related to the first symbol of the MAC PDU and its length would be sufficient to unambiguously define its position in the bursts.
- MBS Portion Symbol Offset which defines the start position of the MBS portion inside the downlink frame in number of OFDMA symbols.
- MBS Portion Subchannel Offset which defines the start position of the MBS portion inside the downlink frame in number of OFDMA subchannels.
- MBS Portion No of symbols which defines the size of the MBS portion inside the downlink frame in number of OFDMA symbols.
- MBS Portion No of subchannels which defines the size of the MBS portion inside the downlink frame in number of OFDMA subchannels.
- Burst Attributes defined for each burst.
- Burst Symbol Offset which defines the start position of a burst inside the MBS portion of a downlink frame in number of OFDMA symbols.
- the Burst Symbol Offset is defined relative to the position of the MBS portion.
- Burst Subchannel Offset which defines the start position of a burst inside the MBS portion of a downlink frame in number of OFDMA subchannels.
- the burst subchannel Offset is defined relative to the position of the MBS portion.
- Burst No of symbols which defines the size of the burst inside the MBS portion of a downlink frame in number of OFDMA symbols.
- Burst No of subchannels which defines the size of the burst inside the MBS portion of a downlink frame in number of OFDMA subchannels.
- Logical Flow ID which defines the Logical Flow ID of the MAC PDU.
- MAC PDU size which defines the size of the MAC PDU in bytes.
- the order of the MAC PDU's inside a burst is given by the list order.
- the MBS server sends out Layout_notify primitives to all base station in the MBS zone on a per frame basis.
- the Layout_notify primitive is preferably not acknowledged by the base stations which allows the MBS server to broadcast or multicast these primitives.
- the Layout_notify primitive contains all necessary information for the base station to generate a MBS portion which is unique in the whole MBS zone.
- the Layout_notify primitive preferably contains a time reference. With this time reference the base station is able to evaluate the appropriate frame in which the MBS portion has to be incorporate.
- the MBS server is responsible for sending the Layout_notify primitive and the MBS data packet in a manner, that all base stations are able to incorporate the appropriate MAC PDU's in the MBS portions synchronously.
- the time reference preferably contains the current absolute time in the MBS server plus a static offset. It shall be derived from an absolute time reference. The static offset shall be equal or larger than the longest transport delay between MBS server and base station inside an MBS zone. Based on this time value and its own time reference, base station shall incorporate the MBS portion in the appropriate downlink frame. To incorporate the appropriate upper layer data into the MBS portion, the upper layer packets of MBS data flows shall also be time stamped.
- the base station shall approximate autonomously an MBS portion.
- FIG. 3 illustrates a server according to the present invention.
- a MBS server will be described in the following.
- the MBS server may be located in the access network gateway or may be a stand alone entity of the wireless access network.
- the MBS server assigns the necessary connection parameters like Connection ID for the MBS flow and transfer all necessary information to all base stations in the MBS zone to force the base stations to generate unique MBS portions on a per frame basis.
- the server comprises means 31 for receiving an indication on the structure of the data to be synchronized as e.g. the size of the different bursts and the structure of the contained MAC PDUs.
- the server additionally comprises scheduling means 32 for determining an optimized structure of a MBS portion dedicated to comprise the data to be synchronized.
- the server comprising means 33 for extracting out of said scheduling means 32 the parameters for unambiguously determining the size position and structure of the portion of data to be synchronized.
- the server comprising signaling means 34 for sending said parameters to a plurality of base stations located in a predefined zone.
- the signaling messages can be sent on a logical connection, which is based on the architecture of the access network.
- FIG. 4 illustrates a base station according to the present invention.
- the base station comprises means 41 for receiving a signaling message comprising parameters unambiguously identifying the size, position and structure of the MBS portion to be used for building a downlink frame.
- the base station further comprises means 42 for encapsulating data received from an access network gateway in downlink frames at the position, size and using the structure prescribed in said signaling message. It will be clear for a person skilled in the art that a kind of short time memory should be available to store the received data before they are encapsulated in the downlink frame.
- the base station comprises means 43 for forwarding said downlink frame towards user terminals. This forwarding is preferably a broadcast or multicast transmission.
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
Description
- This application is a continuation of U.S. patent application Ser. No. 11/845,988, filed Aug. 28, 2007, which claims the benefit of priority application No. EP 06 300 959.1, filed Sep. 19, 2006, both of which are incorporated herein by reference in their entirety.
- The present invention relates to method for performing synchronization for multicast broadcast services in a wireless access communication network.
- Wireless broadband access communication systems as for example WIMAX systems, foresee the support of multicast/broadcast services as defined in IEEE 802.16e-2005 standard. More precisely, some globally defined service flows may carry broadcast or multicast information that should be delivered to a plurality of end user stations. Since a multicast or broadcast transport connection is associated with a service flow, it is associated with the QoS and traffic parameters for that service flow.
- Two types of access to multicast and broadcast services (MBS) may be supported: single base station (Single_BS) access and multi-base station (Mutiple_BS) access. Single-BS access is implemented over multicast and broadcast transport connections within one base station, while multi-BS access is implemented by transmitting data from Service Flow(s) over multiple base stations. A user terminal may support both Single-BS and Multi-BS access. Initiation of MBS with respect to specific user terminals is always performed in registered state by creation of multicast connection carrying MBS data. During such initiation the user terminal learns the Service Flow ID that identifies the service. For multi-BS-MBS, each base station capable of providing MBS belongs to a certain MBS Zone, which is a set of base stations where the same Connection Identifier (CID) is used for transmitting content of certain Service Flow(s). MBS Zone is identified by a unique MBS_ZONE identifier. In multi-BS-MBS all user terminals successfully registered can receive on the cell the MAC PDUs of the multicast and broadcast content that multiple base stations transmit anywhere under the given time period. It requires the multiple base station participating in same Multi-BS-MBS service to be synchronized in the transmissions of common multicast/broadcast data. To ensure proper multicast operation, the CID used for a multi-BS-MBS connection shall be the same for all base stations and user terminals on the same channel that participate in the connection.
- Multicast service synchronized across multiple base station enables a user terminal to receive the multicast or broadcast transmission from multiple base station, and thereby improve the reliability of reception using macro diversity.
- For this purpose and as already mentioned, MBS transmission in a group of base station should be synchronized. In such case, each base station shall transmit the same PDUs, using the same transmission mechanism (symbol, subchannel, modulation, and etc.) at the same time. The way that multiple base stations accomplish the synchronized transmission (which implies performing functions like classification, fragmentation, scheduling at a centralized point called the MBS Server) is of primary importance for a properly working system.
- Indeed, since the transport of broadcast multicast data is IP based, the same packets may be received at very different time at the different base stations from the network side. Consequently, the base station may include the same packet in two different PDUs, generating completely different MBS portions at different base stations and rendering the use of macro diversity impossible at receiver side.
- Consequently, a particular object of the present invention is to provide a method for appropriate synchronization for multicast and broadcast services in wireless broadband access networks.
- Another object of the present invention is to provide a multicast and broadcast server in accordance with the method.
- Another object of the invention is to provide a corresponding base station in accordance with the method.
- These objects, and others that appear below, are achieved by a method, server and base station for performing data synchronisation.
- According to the present invention, the structure of the data to be synchronised in the downlink frame should be transmitted to all base stations of a predefined zone by a centralised server. More precisely, the server sends signaling messages comprising parameters guarantying an unified structure of the data to be synchronised for all base stations belonging to the predefined zone.
- Parameters of the message address preferably the position and size of the data to be synchronised in the frame, further parameters address the size and position of the bursts inside the data and further parameters address the position and the size of the different PDUs in the bursts.
- The method according to the present invention presents the advantage to provide a centralised synchronisation functionality.
- Another advantage of the present invention is that there is no need for transporting physical and MAC layer related information (as header and additional overhead) to the base stations but only the signaling message on a per frame basis. The physical and MAC layer related information are generated at the base stations and forwarded to the mobile terminals over the wireless interface.
- Further advantageous features of the invention are defined in the dependent claims.
- Other characteristics and advantages of the invention will appear on reading the following description of a preferred embodiment given by the way of non-limiting illustrations, and from the accompanying drawings, in which:
-
FIG. 1 illustrates an access network gateway in which the present invention may be implemented; -
FIG. 2 illustrates a downlink frame structure comprising data to be synchronized according to the present invention; -
FIG. 3 illustrates a server according to the present invention; -
FIG. 4 illustrates a base station according to the present invention. -
FIG. 1 illustrates an access network in which the present invention may be implemented. The access network comprises anaccess network gateway 11 andbase stations 12 connected either by fixed links or wireless links to accessnetwork gateway 11.Access network gateway 11 is connected to the core network whilebase stations 12 are servinguser terminals 13 which are preferably mobile. - In the following description the data to be synchronized are preferably broadcast or multicast data. The description will be may accordingly. It will be clear for a person skilled in the art that the present invention may apply to other types of data to be synchronized.
- Access network gateway comprises a Multicast Broadcast Service (MBS)
server 111 according to the present invention andbase stations 12 comprise aMBS client 121 according to the present invention. It will be clear for the persons skilled in the art that MBS server is a central entity of the access network which may be either collocated to the access network gateway or stand alone or collocated to any other central access network entity. - According to the present invention, MBS
server 111 sends messages toMBS clients 121 indicating the structure of each downlink frame to be further sent touser terminal 13 over the air interface. This enables it to send atbase stations 12 completely synchronized data over the air interface towards the user terminals enabling them to perform macro diversity when receiving MBS data from different base stations in case MBS-multi base station service is available in the network. - If this were not the case, MBS data which are IP packets would be encapsulated at the
base stations 12 without any coordination. Consequently, the contents of the frames sent simultaneously by thedifferent base stations 12 could be different since the schedulers run independently and every scheduler generates a individual downlink frame which differs from the downlink frames of its neighbors. Then, it would impossible foruser terminal 13 usually performing macrodiversity to use this feature for MBS services. - To accomplish unified transmission according to the present invention, all
base stations 12 in one MBS zone have to generate unique multicast and broadcast portions inside the downlink frames. The MBS portion is a reserved space inside a downlink frame exclusively for MBS connections. For having a synchronized transmission, all base stations in one MBS zone have to be forced to generate a MBS zone wide unique MBS portion. To accomplish this, MBSserver 11 sends messages to allbase stations 12 in one MBS zone. These messages contain information that gives the base stations the opportunity to generate MBS zone wide unique MBS portions. The messages are transported betweenMBS server 11 andbase stations 12 via the IP protocol. - Then,
base stations 12 shortly store the received MBS data and organize them sub sequentially according to the signaled frame structure. - The signaling message is sent from the MBS server which has the knowledge of the MBS data at a centralized point of the access network and which could in advance determine the organization of the frames containing MBS data which will be sent over the wireless air interface.
-
FIG. 2 illustrates a downlink frame structure according to the present invention. - A downlink frame comprising MBS data comprises a
MBS portion 21, which itself comprisesseveral bursts 22, each burst 22 comprises several MAC PDUs. - In order to guaranty a synchronized MBS portion at all base station of a user terminal zone, the message sent by the MBS server to the base stations should comprise an indication on the size and position of the MBS zone in the downlink frame and/or indication on the size and position of the different bursts in the MBS portion and/or a indication on the size and position of the different MAC PDUs in the different bursts.
- This signaling message may be sent on a per downlink frame basis. Some parameters of the message as the size and position of the MBS portion may be sent only once at connection establishment if the size and position of the MBS portion is fixed for the duration of the connection. Alternatively if the size and position of the MBS portion is dynamically varying, this information should also be provided on a per frame basis.
- In a preferred embodiment of the present invention, the downlink frame has a time and frequency extension as it is the case in OFDMA based wireless access networks as WIMAX.
- In such system it may be advantageous that the bursts which can be defined as a part of the downlink frame using the same physical parameters such as modulation and coding schemes, are rectangular in their time/frequency extension. This would have the advantage to reduce the load of the signaling for defining the size and position of the bursts. Consequently, only the parameter as the first symbol of the burst, its time extension and its frequency extension need to be transmitted in the signaling message.
- Concerning the MAC PDUs which are the protocol data units of the medium access control layer, they may be preferably arranged in a burst so as to first extend in the time direction and then in the frequency direction. To this extend parameter related to the first symbol of the MAC PDU and its length would be sufficient to unambiguously define its position in the bursts.
- It will be clear for a person skilled in the art that any other considerations regarding the arrangement of the bursts and MAC PDUs can be used to reduce the load of the signaling message.
- A non exhaustive list of parameters which may be contained in the message is given below:
- MBS Portion Symbol Offset which defines the start position of the MBS portion inside the downlink frame in number of OFDMA symbols.
- MBS Portion Subchannel Offset which defines the start position of the MBS portion inside the downlink frame in number of OFDMA subchannels.
- MBS Portion No of symbols which defines the size of the MBS portion inside the downlink frame in number of OFDMA symbols.
- MBS Portion No of subchannels which defines the size of the MBS portion inside the downlink frame in number of OFDMA subchannels.
- Burst Attributes defined for each burst.
- Burst Symbol Offset which defines the start position of a burst inside the MBS portion of a downlink frame in number of OFDMA symbols. The Burst Symbol Offset is defined relative to the position of the MBS portion.
- Burst Subchannel Offset which defines the start position of a burst inside the MBS portion of a downlink frame in number of OFDMA subchannels. The burst subchannel Offset is defined relative to the position of the MBS portion.
- Burst No of symbols which defines the size of the burst inside the MBS portion of a downlink frame in number of OFDMA symbols.
- Burst No of subchannels which defines the size of the burst inside the MBS portion of a downlink frame in number of OFDMA subchannels.
- Coding Scheme which defines the coding scheme of the burst.
- MAC PDU Attributes defined for each MAC PDU:
- CID which defines the CID of the MAC PDU.
- Logical Flow ID which defines the Logical Flow ID of the MAC PDU.
- MAC PDU size which defines the size of the MAC PDU in bytes. The order of the MAC PDU's inside a burst is given by the list order.
- In a preferred embodiment of the present invention, the MBS server sends out Layout_notify primitives to all base station in the MBS zone on a per frame basis. The Layout_notify primitive is preferably not acknowledged by the base stations which allows the MBS server to broadcast or multicast these primitives. The Layout_notify primitive contains all necessary information for the base station to generate a MBS portion which is unique in the whole MBS zone. For synchronization purposes, the Layout_notify primitive preferably contains a time reference. With this time reference the base station is able to evaluate the appropriate frame in which the MBS portion has to be incorporate. The MBS server is responsible for sending the Layout_notify primitive and the MBS data packet in a manner, that all base stations are able to incorporate the appropriate MAC PDU's in the MBS portions synchronously. The time reference preferably contains the current absolute time in the MBS server plus a static offset. It shall be derived from an absolute time reference. The static offset shall be equal or larger than the longest transport delay between MBS server and base station inside an MBS zone. Based on this time value and its own time reference, base station shall incorporate the MBS portion in the appropriate downlink frame. To incorporate the appropriate upper layer data into the MBS portion, the upper layer packets of MBS data flows shall also be time stamped.
- Preferably, If a Layout_notify primitive is not received in time by a base station due to network failure, the base station shall approximate autonomously an MBS portion.
-
FIG. 3 illustrates a server according to the present invention. A MBS server will be described in the following. The MBS server may be located in the access network gateway or may be a stand alone entity of the wireless access network. The MBS server assigns the necessary connection parameters like Connection ID for the MBS flow and transfer all necessary information to all base stations in the MBS zone to force the base stations to generate unique MBS portions on a per frame basis. - The server comprises means 31 for receiving an indication on the structure of the data to be synchronized as e.g. the size of the different bursts and the structure of the contained MAC PDUs. The server additionally comprises scheduling means 32 for determining an optimized structure of a MBS portion dedicated to comprise the data to be synchronized. Further, the server comprising means 33 for extracting out of said scheduling means 32 the parameters for unambiguously determining the size position and structure of the portion of data to be synchronized. Lastly, the server comprising signaling means 34 for sending said parameters to a plurality of base stations located in a predefined zone. The signaling messages can be sent on a logical connection, which is based on the architecture of the access network.
-
FIG. 4 illustrates a base station according to the present invention. - The base station comprises means 41 for receiving a signaling message comprising parameters unambiguously identifying the size, position and structure of the MBS portion to be used for building a downlink frame. The base station further comprises means 42 for encapsulating data received from an access network gateway in downlink frames at the position, size and using the structure prescribed in said signaling message. It will be clear for a person skilled in the art that a kind of short time memory should be available to store the received data before they are encapsulated in the downlink frame. Lastly, the base station comprises means 43 for forwarding said downlink frame towards user terminals. This forwarding is preferably a broadcast or multicast transmission.
Claims (4)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US13/433,632 US20120182922A1 (en) | 2006-09-19 | 2012-03-29 | Method for performing synchronisation for multicast broadcast services in a wireless access communication network, corresponding multicast broadcast server and base station |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP06300959.1 | 2006-09-19 | ||
EP06300959.1A EP1903813B1 (en) | 2006-09-19 | 2006-09-19 | Method, server and base station for synchronization of multicast and broadcast frame portions in wimax systems |
US11/845,988 US8179878B2 (en) | 2006-09-19 | 2007-08-28 | Method for performing synchronisation for multicast broadcast services in a wireless access communication network, corresponding multicast broadcast server and base station |
US13/433,632 US20120182922A1 (en) | 2006-09-19 | 2012-03-29 | Method for performing synchronisation for multicast broadcast services in a wireless access communication network, corresponding multicast broadcast server and base station |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/845,988 Continuation US8179878B2 (en) | 2006-09-19 | 2007-08-28 | Method for performing synchronisation for multicast broadcast services in a wireless access communication network, corresponding multicast broadcast server and base station |
Publications (1)
Publication Number | Publication Date |
---|---|
US20120182922A1 true US20120182922A1 (en) | 2012-07-19 |
Family
ID=37737444
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/845,988 Active 2030-02-12 US8179878B2 (en) | 2006-09-19 | 2007-08-28 | Method for performing synchronisation for multicast broadcast services in a wireless access communication network, corresponding multicast broadcast server and base station |
US13/433,632 Abandoned US20120182922A1 (en) | 2006-09-19 | 2012-03-29 | Method for performing synchronisation for multicast broadcast services in a wireless access communication network, corresponding multicast broadcast server and base station |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/845,988 Active 2030-02-12 US8179878B2 (en) | 2006-09-19 | 2007-08-28 | Method for performing synchronisation for multicast broadcast services in a wireless access communication network, corresponding multicast broadcast server and base station |
Country Status (6)
Country | Link |
---|---|
US (2) | US8179878B2 (en) |
EP (1) | EP1903813B1 (en) |
KR (1) | KR101173146B1 (en) |
CN (2) | CN101166310B (en) |
ES (1) | ES2592909T3 (en) |
WO (1) | WO2008034667A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103442426A (en) * | 2013-08-27 | 2013-12-11 | 京信通信系统(中国)有限公司 | Method and system for air interface synchronization between base stations |
Families Citing this family (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8189626B2 (en) * | 2007-09-21 | 2012-05-29 | Future Wei Technologies, Inc. | System and method for multicast and broadcast synchronization in wireless access systems |
EP2106036A1 (en) | 2008-03-25 | 2009-09-30 | Alcatel Lucent | Data synchronization in collaborative MIMO and method thereof |
US20090245402A1 (en) * | 2008-03-31 | 2009-10-01 | Qualcomm Incorporated | Apparatus and method for tile processing in wireless communications |
DE602008005410D1 (en) | 2008-04-28 | 2011-04-21 | Alcatel Lucent | Resource allocation method, network element and computer program product therefor |
US8498231B2 (en) * | 2008-08-05 | 2013-07-30 | Industrial Technology Research Institute | System and method for multicast and broadcast service synchronization |
US8031665B1 (en) * | 2008-09-16 | 2011-10-04 | Clear Wireless Llc | Connection identifier reservation in a wireless communication system |
WO2010038211A1 (en) * | 2008-10-03 | 2010-04-08 | Nokia Corporation | Method and apparatus for providing multicast and broadcast service |
US8625484B2 (en) | 2009-02-05 | 2014-01-07 | Qualcomm Incorporated | Methods and apparatus for providing fast and power efficient multicast scheme |
US8301177B2 (en) * | 2009-03-03 | 2012-10-30 | Intel Corporation | Efficient paging operation for femtocell deployment |
JP2010272784A (en) * | 2009-05-25 | 2010-12-02 | Panasonic Corp | Semiconductor laser device |
KR101781194B1 (en) * | 2009-12-23 | 2017-09-25 | 한국전자통신연구원 | Method for receiving mobile multicast broadcast service in wireless communication system |
CN102196361A (en) * | 2010-03-05 | 2011-09-21 | 中兴通讯股份有限公司 | Sending and receiving methods, devices and systems of MBS (Multicasting Broadcasting Service) protocol data unit |
KR101918734B1 (en) | 2011-07-13 | 2019-02-08 | 한국전자통신연구원 | Method and System for Providing Mobile Broadcast Service, Controller and Driving Method Thereof, and Computer Readable Medium for Recording Program |
CN104678922B (en) * | 2013-12-02 | 2017-09-29 | 广东美的制冷设备有限公司 | Time control method and system based on Internet of Things |
WO2023197173A1 (en) * | 2022-04-12 | 2023-10-19 | 北京小米移动软件有限公司 | Service synchronization system |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20050118992A1 (en) * | 2003-10-02 | 2005-06-02 | Samsung Electronics Co., Ltd. | Method of transmitting and receiving service availability information about a multimedia broadcast/multicast service |
US20050201416A1 (en) * | 2004-03-12 | 2005-09-15 | Samsung Electronics Co., Ltd. | Transmitter and receiver for data burst in a wireless communication system |
WO2006085732A1 (en) * | 2005-02-14 | 2006-08-17 | Lg Electronics Inc. | Method of controlling data transmission for mbs in broadband wireless access system |
US20060239264A1 (en) * | 2005-04-25 | 2006-10-26 | Samsung Electronics Co., Ltd. | Method for transmitting/receiving data in a communication system |
US20080056219A1 (en) * | 2006-08-29 | 2008-03-06 | Muthaiah Venkatachalam | Broadband wireless access network and methods for joining multicast broadcast service sessions within multicast broadcast service zones |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5950135A (en) * | 1993-07-30 | 1999-09-07 | British Telecommunications Public Limited Company | Communication system with traffic distribution over multiple paths |
US5974034A (en) * | 1997-01-16 | 1999-10-26 | Gwcom, Inc. | System and method for synchronized wide and local area communications utilizing a single frequency |
EP1364507A2 (en) * | 2001-02-22 | 2003-11-26 | Koninklijke Philips Electronics N.V. | Multicarrier transmission system with reduced complexity leakage matrix multiplication |
JP2004229117A (en) * | 2003-01-24 | 2004-08-12 | Ntt Docomo Inc | Communication system, multicast switching device and communicating method |
US8089911B2 (en) * | 2004-05-01 | 2012-01-03 | Neocific, Inc. | Methods and apparatus for cellular broadcasting and communication system |
US7715842B2 (en) * | 2005-04-09 | 2010-05-11 | Lg Electronics Inc. | Supporting handover of mobile terminal |
-
2006
- 2006-09-19 ES ES06300959.1T patent/ES2592909T3/en active Active
- 2006-09-19 EP EP06300959.1A patent/EP1903813B1/en active Active
-
2007
- 2007-08-01 KR KR1020097005547A patent/KR101173146B1/en active IP Right Grant
- 2007-08-01 WO PCT/EP2007/057946 patent/WO2008034667A1/en active Application Filing
- 2007-08-28 US US11/845,988 patent/US8179878B2/en active Active
- 2007-09-04 CN CN2007101490027A patent/CN101166310B/en active Active
- 2007-09-04 CN CN201210366029.2A patent/CN102904631B/en active Active
-
2012
- 2012-03-29 US US13/433,632 patent/US20120182922A1/en not_active Abandoned
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20050118992A1 (en) * | 2003-10-02 | 2005-06-02 | Samsung Electronics Co., Ltd. | Method of transmitting and receiving service availability information about a multimedia broadcast/multicast service |
US20050201416A1 (en) * | 2004-03-12 | 2005-09-15 | Samsung Electronics Co., Ltd. | Transmitter and receiver for data burst in a wireless communication system |
WO2006085732A1 (en) * | 2005-02-14 | 2006-08-17 | Lg Electronics Inc. | Method of controlling data transmission for mbs in broadband wireless access system |
US20060239264A1 (en) * | 2005-04-25 | 2006-10-26 | Samsung Electronics Co., Ltd. | Method for transmitting/receiving data in a communication system |
US20080056219A1 (en) * | 2006-08-29 | 2008-03-06 | Muthaiah Venkatachalam | Broadband wireless access network and methods for joining multicast broadcast service sessions within multicast broadcast service zones |
Non-Patent Citations (1)
Title |
---|
Mandin, Jeff -- IEEE C802.16e-04/275r1, Aug.28, 2004. * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103442426A (en) * | 2013-08-27 | 2013-12-11 | 京信通信系统(中国)有限公司 | Method and system for air interface synchronization between base stations |
Also Published As
Publication number | Publication date |
---|---|
ES2592909T3 (en) | 2016-12-02 |
KR20090057390A (en) | 2009-06-05 |
US8179878B2 (en) | 2012-05-15 |
CN102904631A (en) | 2013-01-30 |
EP1903813A1 (en) | 2008-03-26 |
EP1903813B1 (en) | 2016-06-22 |
WO2008034667A1 (en) | 2008-03-27 |
CN101166310A (en) | 2008-04-23 |
CN102904631B (en) | 2016-08-10 |
CN101166310B (en) | 2012-11-14 |
US20080069019A1 (en) | 2008-03-20 |
KR101173146B1 (en) | 2012-08-16 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US8179878B2 (en) | Method for performing synchronisation for multicast broadcast services in a wireless access communication network, corresponding multicast broadcast server and base station | |
CN101163285B (en) | Wireless communication systems | |
US7567528B2 (en) | Communications system | |
EP2192744B1 (en) | A method, system and apparatus for scheduling data | |
US8515437B2 (en) | Wireless resource allocation method, wireless mobile station and wireless base station in wireless communication system | |
US9143223B2 (en) | Relay station, base station, and radio communication method | |
CN107466114B (en) | Voice data transmission control method and device | |
Gruber et al. | Multimedia broadcast multicast service: New transmission schemes and related challenges | |
US20120051350A1 (en) | Communication method in an ieee 802.11 wireless law environment | |
TW200826538A (en) | Centralized-scheduler relay station for MMR-extended 802.16E system | |
CN106559896B (en) | Downlink control information transmission method, base station and user equipment for multi-user cooperative communication | |
WO2010017728A1 (en) | Method and apparatus for recovery processing of synchronously transmitted service data | |
US7382758B2 (en) | Medium access control for simultaneous channel communications | |
CN101184222A (en) | Method and network element equipment for implementing video service in wireless communication system | |
EP2426958B1 (en) | Method, bm-sc and base station for multiplexing mbms services in mbsfn | |
JP3221414B2 (en) | Wireless asynchronous communication mode communication system and broadcast control method | |
CN101047492B (en) | Method and system for implementing synchronous RLC serial number between radio network controller | |
EP2106036A1 (en) | Data synchronization in collaborative MIMO and method thereof | |
CN115836538A (en) | Reliable multicast transmission with uplink feedback | |
EP2243332A1 (en) | Mobile communications systems | |
CN105704069B (en) | Method and device for saving processing resources in network element | |
KR101333623B1 (en) | Apparatus and method for multicast and broadcast service in broadband wireless access system | |
CN115086883A (en) | Multicast broadcast service parallel transmission method and user equipment | |
Schmidt et al. | IST-1999-11571 EMBRACE D11 Medium Access Control for mixed traffic | |
CN102273171A (en) | Method, device and computer program for interacting shared information between communication units |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: CREDIT SUISSE AG, NEW YORK Free format text: SECURITY AGREEMENT;ASSIGNOR:ALCATEL LUCENT N.V.;REEL/FRAME:029737/0641 Effective date: 20130130 |
|
AS | Assignment |
Owner name: ALCATEL LUCENT, FRANCE Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:FAHLDIECK, TORSTEN;REEL/FRAME:032444/0050 Effective date: 20070820 |
|
AS | Assignment |
Owner name: CREDIT SUISSE AG, NEW YORK Free format text: SECURITY INTEREST;ASSIGNOR:ALCATEL LUCENT;REEL/FRAME:032845/0465 Effective date: 20140505 |
|
AS | Assignment |
Owner name: ALCATEL LUCENT, FRANCE Free format text: RELEASE OF SECURITY INTEREST;ASSIGNOR:CREDIT SUISSE AG;REEL/FRAME:033677/0617 Effective date: 20140819 |
|
AS | Assignment |
Owner name: ALCATEL LUCENT (SUCCESSOR IN INTEREST TO ALCATEL-LUCENT N.V.), FRANCE Free format text: RELEASE OF SECURITY INTEREST;ASSIGNOR:CREDIT SUISSE AG;REEL/FRAME:033687/0150 Effective date: 20140819 Owner name: ALCATEL LUCENT (SUCCESSOR IN INTEREST TO ALCATEL-L Free format text: RELEASE OF SECURITY INTEREST;ASSIGNOR:CREDIT SUISSE AG;REEL/FRAME:033687/0150 Effective date: 20140819 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |