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US9271262B2 - Method and apparatus for managing multicast and broadcast service resource - Google Patents

Method and apparatus for managing multicast and broadcast service resource Download PDF

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Publication number
US9271262B2
US9271262B2 US13/635,145 US201113635145A US9271262B2 US 9271262 B2 US9271262 B2 US 9271262B2 US 201113635145 A US201113635145 A US 201113635145A US 9271262 B2 US9271262 B2 US 9271262B2
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Prior art keywords
mbs
message
zone
scd
lifetime
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US20130010671A1 (en
Inventor
Eunkyung Kim
Sung Cheol Chang
Jae Sun CHA
Soojung Jung
Hyun Lee
Chul Sik Yoon
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Electronics and Telecommunications Research Institute ETRI
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Electronics and Telecommunications Research Institute ETRI
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Priority claimed from PCT/KR2011/001854 external-priority patent/WO2011115434A2/ko
Assigned to ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE reassignment ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: CHA, JAE SUN, CHANG, SUNG CHEOL, JUNG, SOOJUNG, KIM, EUNKYUNG, LEE, HYUN, YOON, CHUL SIK
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    • H04W72/005—
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/30—Resource management for broadcast services
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0446—Resources in time domain, e.g. slots or frames
    • 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

Definitions

  • the present invention relates to a method and an apparatus for managing a multicast and broadcast service (MBS) resource.
  • MMS multicast and broadcast service
  • the MBS is a point-to-multipoint transmission scheme for concurrent transport of data packets from a source to a plurality of destinations.
  • a broadcast service is a service where data packets are transmitted to all users
  • a multicast service is a service where data packets are transmitted to users belonging to a specific group.
  • a downlink resource i.e., a downlink frame, is divided into a unicast zone and a multicast zone for the MBS.
  • Sub-bands are divided into sub-band logical resource units (SLRUs) within one subframe, and each MBS zone and the unicast zone are allocated by the SLRUs.
  • SLRUs sub-band logical resource units
  • a base station since the terminal should appropriately receive a corresponding service, it is required that a base station transmits information regarding how the zones are distinguished, information on a time when the zones are distinguished, and information regarding the change of the zones to a terminal.
  • aspects of the present invention provide a method and an apparatus for managing an MBS resource for efficiently providing a terminal with information on distinguished zones of a downlink resource when supporting an MBS.
  • a method of managing a MBS resource in a terminal includes receiving a system configuration descriptor (SCD) message including zone allocation information of sub-bands that are divided into a plurality of zones, receiving an MBS configuration message including configuration information for an MBS operation and a lifetime, receiving an SCD message in which the zone allocation information is changed, receiving a new MBS configuration message after the lifetime of the MBS configuration message at a time when the changed SCD message is received expires, and applying the changed zone allocation information at the beginning of the first MBS scheduling interval (MSI) of the new MBS configuration message.
  • SCD system configuration descriptor
  • the plurality of zones may include at least one zone for at least one MBS zone and a zone for a unicast.
  • the SCD messages may further include a flag representing that the plurality of zones include the zone for the unicast.
  • the SCD message may further include a count that is incremented when a content of the SCD message is changed.
  • the method may further include checking a change of the zone allocation information based on the count of the SCD message.
  • Receiving the new MBS configuration message may include receiving the MBS configuration message at a time that the lifetime indicates.
  • the zone allocation information includes a bitmap including bits, each having ‘1’ when two adjacent sub-bands correspond to different zones.
  • the MSI may include a plurality of superframes, and the SCD message may further include information on a length of the MSI.
  • a method of managing an MBS resource in a base station includes transmitting an SCD message including zone allocation information of sub-bands that are divided into a plurality of zones to a terminal, periodically transmitting an MBS configuration message including configuration information for an MBS operation and a lifetime to a terminal, transmitting another SCD message including changed zone allocation information when the zone allocation information is changed, and applying the changed zone allocation information at the beginning of the first MSI of an MBS configuration message after the lifetime at a time when the zone allocation information is changed expires.
  • the plurality of zones may include at least one zone for at least one MBS zone and a zone for a unicast.
  • the SCD messages may further include a flag representing that the plurality of zones include the zone for the unicast.
  • the SCD message may further include a count that is incremented when a content of the SCD message is changed.
  • the zone allocation information may include a bitmap including bits, each setting to ‘1’ when two adjacent sub-bands correspond to different zones.
  • the MSI may include a plurality of superframes, and the SCD message may further include information on a length of the MSI
  • an apparatus for managing an MBS resource in a terminal includes a receiver and a controller.
  • the receiver periodically receives an SCD message including zone allocation information of sub-bands that are divided into a plurality of zones, and receives an MBS configuration message including configuration information for an MBS operation and a lifetime.
  • the controller applies the changed zone allocation information at the beginning of the first MSI of a next MBS configuration message after the lifetime of an existing MBS configuration message expires.
  • the plurality of zones may include at least one zone for at least one MBS zone and a zone for a unicast
  • the SCD message may further include a count that is incremented when a content of the SCD message is changed, and the controller may check a change of the zone allocation information based on the count of the SCD message.
  • an apparatus for managing an MBS resource in a base station includes a transmitter and a controller.
  • the transmitter periodically transmits an SCD message including zone allocation information of sub-bands that are divided into a plurality of zones, and periodically transmits an MBS configuration message including configuration information for an MBS operation and a lifetime.
  • the controller applies the changed zone allocation information at the beginning of the first MSI of a next MBS configuration message after the lifetime of an existing MBS configuration message expires.
  • the plurality of zones may include at least one zone for at least one MBS zone and a zone for a unicast.
  • the SCD message further may include a count that is incremented when a content of the SCD message is changed.
  • a base station and a terminal can apply changed sub-band zone allocation information at an exact time. Further, a terminal that receives data through a unicast can synchronize a changing time of a zone on which the terminal measures a channel with a changing time of a zone that a base station allocates on the unicast.
  • FIG. 1 is a flowchart showing an MBS supporting method according to an embodiment of the present invention.
  • FIG. 2 is a drawing showing an SCD message according to an embodiment of the present invention.
  • FIG. 3 and FIG. 4 are drawings showing one example of zone allocation of a downlink resource, respectively.
  • FIG. 5 is a drawing showing a change of zone allocation of a downlink resource.
  • FIG. 6 is a drawing showing a time at which a changed SCD message is applied.
  • FIG. 7 is a block diagram of an MBS resource managing apparatus of a terminal according to an embodiment of the present invention.
  • FIG. 8 is a block diagram of an MBS resource managing apparatus of a base station according to an embodiment of the present invention
  • the term terminal may designate a mobile terminal (MT), a mobile station (MS), a subscriber station (SS), a portable subscriber station (PSS), an access terminal (AT), user equipment (UE), and so on, or may include all or some functions thereof.
  • MT mobile terminal
  • MS mobile station
  • SS subscriber station
  • PSS portable subscriber station
  • AT access terminal
  • UE user equipment
  • base station may designate a node B, an evolved node B (eNodeB), an access point (AP), a radio access station (RAS), a base transceiver station (BTS), an MMR (mobile multihop relay)-BS, and so on, or may include all or some functions thereof.
  • eNodeB evolved node B
  • AP access point
  • RAS radio access station
  • BTS base transceiver station
  • MMR mobile multihop relay
  • FIG. 1 is a flowchart showing an MBS supporting method according to an embodiment of the present invention
  • FIG. 2 is a drawing showing a system configuration descriptor (SCD) message according to an embodiment of the present invention.
  • SCD system configuration descriptor
  • a base station periodically transmits system configuration information for describing the system configuration to a terminal (S 110 ).
  • the system configuration information may be transmitted through an SCD message.
  • the SCD message includes zone allocation bitmap (Zone_Allocation-Bit-MAP) representing zone allocation information of sub-bands, a zone flag ZF representing whether the last zone is used for a unicast or not, and a configuration change count representing whether a content of the SCD message is changed or not.
  • the configuration change count is incremented whenever the content of the SCD message is changed.
  • the terminal when the terminal wants to receive the MBS, the terminal transmits information on MBS modes supported by the terminal to a base station, and the base station transmits information on MBS modes that is supported by the base station among the MBS modes supported by the terminal, to the terminal (S 120 ).
  • MBS capability is exchanged between the base station and the terminal through this process.
  • the terminal may transmit MBS mode information through a registration request (REG-REQ) message for requesting registration of network entry or network re-entry.
  • the base station may transmit MBS mode information through a registration response (REG-RSP) message to the REG-REQ message.
  • REG-REQ registration request
  • REG-RSP registration response
  • the base station transmits a connection establishment request message for establishing MBS connection to the terminal, and the terminal transmits a response message thereto to the base station (S 130 ).
  • a dynamic service addition request (DSA-REQ) message may be used as the connection establishment request message
  • a dynamic service addition response (DSA-RSP) message may be used as the response message to the connection establishment request message.
  • the MBS connection establishment request may be initiated by the terminal.
  • the terminal may transmit the DSA-REQ message to the base station, and the base station may transmit the DSA-RSP message to the terminal.
  • the base station periodically transmits an MBS configuration (MBS-CFG) to the terminal, and the terminal receives the MBS-CFG message to acquire MBS configuration information for receiving the MBS (S 140 ).
  • the terminal acquires an MBS MAP based on the MBS configuration information (S 150 ), and receives the MBS from the base station based on information of the MBS MAP (S 160 ).
  • the MBS-CFG message may be transmitted in a cycle of 32 superframes, and particularly may be transmitted at a superframe satisfying a condition of Equation 1.
  • the MBS-CFG message includes, as the MBS configuration information, an MBS zone identifier (ID), resource information on an MBS MAP applied to the MBS Zone ID, burst size information on the MBS MAP, a neighbor MBS Zone ID, and mapping information of current MBS ID and flow ID (FID) and new MBS ID and FID between a serving MBS zone and a neighbor MBS zone, for each MBS zone.
  • ID MBS zone identifier
  • FID current MBS ID and flow ID
  • the resource information on the MBS MAP may be a resource index (MBS MAP resource index) representing a location and an allocation size of MBS MAP resources in a sub-band zone allocated to the MBS zone.
  • the burst size information on the MBS MAP may be an offset (MBS MAP I SizeOffset ) used to compute a burst size of the MBS MAP.
  • the MBS ID is an identifier that is allocated to the terminal for receiving the MBS.
  • the FID is an identifier allocated to an MBS connection, and is used along with a corresponding MBS ID.
  • the MBS-CFG message further includes a lifetime that represents a duration in which the MBS configuration information does not change. The lifetime indicates when the terminal receives and decodes the MBS-CFG message, and does not count down.
  • the terminal decodes the MBS-CFG message, and acquires information on the MBS MAP applied to the MBS zone to which it belongs to receive the MBS MAP.
  • the terminal does not decode the MBS-CFG message again before a time that the lifetime of the decoded MBS-CFG message indicates, and receives and decodes an MBS-CFG message at the corresponding time.
  • the terminal can decode an MBS-CFG message again at a superframe satisfying a condition of Equation 2.
  • N superframe is a superframe number.
  • FIG. 3 and FIG. 4 are drawings showing one example of zone allocation of a downlink resource, respectively.
  • sub-bands are divided into zones in a downlink frame, and each sub-band zone is allocated to a corresponding MBS zone (MBS Zone # 1 or MBS Zone # 2 ).
  • MBS Zone # 1 or MBS Zone # 2 MBS Zone # 1 or MBS Zone # 2 .
  • the sub-bands are divided into 10 sub-bands
  • the first to fifth sub-bands are allocated to the first MBS zone (MBS Zone # 1 )
  • the sixth to eighth sub-bands are allocated to the second MBS zone (MBS Zone # 2 )
  • the ninth and tenth sub-bands are allocated to the unicast.
  • the zone allocation bitmap (Zone_Allocation-Bit-MAP) may be set to “000010010” as shown in FIG. 4 . That is, the total number of bits of the zone allocation bitmap may be set to the difference between the total number of the sub-bands and 1.
  • a corresponding bit may be set to ‘1’.
  • a corresponding bit may be set to ‘0’.
  • a zone flag (ZF of FIG. 2 ) of the SDU message may be set to a value representing the allocation of the unicast.
  • FIG. 5 is a drawing showing a change of zone allocation of a downlink resource
  • FIG. 6 is a drawing showing a time at which a changed SCD message is applied.
  • a base station may change zone allocation of sub-bands in a downlink resource. For example, as shown in FIG. 5 , a case that the first to third sub-bands are allocated to the first MBS zone (MBS Zone # 1 ), the fourth and fifth sub-bands are allocated to the second MBS zone (MBS Zone # 2 ), the sixth and seventh sub-bands are allocated to the third MBS zone (MBS Zone # 3 ), and the eighth to tenth sub-bands are allocated to the unicast may be changed to a case corresponding to the example of FIG. 3 and FIG. 4 .
  • the base station updates a content of the SCD message, i.e., the zone allocation bitmap, to change sub-band zone allocation information, and transmits the updated SCD message.
  • the base station transmits the SCD message by incrementing a value of a configuration change count by 1, thereby representing the update of the SCD message.
  • the terminal which has received unicast data or an MBS based on the existing sub-band zone allocation information, receives the unicast data or the MBS based on the changed sub-band zone allocation information at the beginning of the first MBS Scheduling Interval (MSI), after receiving the changed SCD message.
  • MSI MBS Scheduling Interval
  • the MSI is an interval in which traffic is scheduled, and includes successive superframes.
  • An MSI length N MS representing the number of superframes consisting of the MSI may be transmitted through the SCD message.
  • the MSI may begin at a superframe satisfying a condition of Equation 3.
  • the first MSI to which the sub-band zone allocation information of the changed SCD message is applied means the first MSI within a lifetime of a next MBS-CFG message. That is, if the lifetime of an MBS-CFG message does not expire at a time when the terminal receives the changed SCD message, the terminal receives the MBS from the base station based on information of an MBS MAP that is acquired by the existing MBS-CFG message. If the lifetime of the existing MBS-CFG message expires, the terminal applies the sub-band zone allocation information of the changed SCD message at the beginning of the first MSI within the lifetime of a new MBS-CFG message. The terminal receives the MBS based on the sub-band zone allocation information of the changed SCD message and MBS configuration information of the new MBS-CFG message.
  • the terminal can receive the MBS based on the existing MBS configuration information if the lifetime of the existing MBS-CFG message does not expire, and can receive the MBS based on the changed SCD message and MBS configuration information of the new MBS-CFG message if the lifetime expires.
  • the terminal can apply the changed sub-band zone allocation information at an exact time.
  • a terminal which receives data through the unicast, can measure channel status on the unicast zone based on the existing sub-band zone allocation information before the changed SCD message is applied, measure the channel status on the unicast zone based on the changed sub-band zone allocation information after the changed SCD message is applied, and feed back measured channel information to the base station. Accordingly, a changing time of the zone on which the terminal measures the channel can be synchronized with a changing time of the zone that the base station allocates on the unicast.
  • the terminal when checking the change of the SCD message through the configuration change count before the lifetime of the existing MBS-CFG message expires, the terminal may receive a next MBS-CFG message without waiting for expiration of the lifetime and apply the sub-band zone allocation information of the new SCD message and the MBS configuration information of the MBS-CFG message. Then, a delay of a time when the changed SCD message is applied can be minimized.
  • FIG. 7 is a block diagram of an MBS resource managing apparatus of a terminal according to an embodiment of the present invention
  • FIG. 8 is a block diagram of an MBS resource managing apparatus of a base station according to an embodiment of the present invention.
  • an MBS resource managing apparatus 700 of a terminal includes a receiver 710 and a controller 720 .
  • the receiver 710 receives and decodes an MBS-CFG message and an SCD message transmitted from a base station.
  • the controller 720 controls the receiver 710 to decode the MBS-CFG message that is transmitted at a time that a lifetime of the MBS-CFG message indicates. Further, when checking a change of a content of the SCD message based on a count of the SCD message, the controller 720 applies the changed content of the SCD message at the beginning of the first MSI after the lifetime of the MBS-CFG message expires.
  • an MBS resource managing apparatus 800 of a base station includes a controller 810 and a transmitter 820 .
  • the controller 810 configures an MBS-CFG message and SCD message to be transmitted to a terminal, and increments a system configuration count of the SCD message when sub-band zone allocation information is changed. Further, when a content of the SCD messaged is changed, the controller 810 applies the changed content of the SCD message at the beginning of the first MSI after the lifetime of the MBS-CFG message expires.
  • the transmitter 820 periodically transmits the MBS-CFG message and the SCD message.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Mobile Radio Communication Systems (AREA)
US13/635,145 2010-03-17 2011-03-17 Method and apparatus for managing multicast and broadcast service resource Active 2032-07-16 US9271262B2 (en)

Applications Claiming Priority (9)

Application Number Priority Date Filing Date Title
KR20100023605 2010-03-17
KR10-2010-0023605 2010-03-17
KR20100040477 2010-04-30
KR10-2010-0040477 2010-04-30
KR20100075860 2010-08-06
KR10-2010-0075860 2010-08-06
KR10-2011-0023474 2011-03-16
KR1020110023474A KR20110104905A (ko) 2010-03-17 2011-03-16 멀티캐스트 및 브로드캐스트 서비스 자원 관리 방법 및 장치
PCT/KR2011/001854 WO2011115434A2 (ko) 2010-03-17 2011-03-17 멀티캐스트 및 브로드캐스트 서비스 자원 관리 방법 및 장치

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CN116601978A (zh) * 2020-10-21 2023-08-15 谷歌有限责任公司 管理多播和广播服务的传送和接收
CN118575453A (zh) * 2022-06-28 2024-08-30 北京小米移动软件有限公司 一种mbs接收状态信息的发送/接收方法及其装置

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