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WO2009062355A1 - Procédé destiné à envoyer une unité de données de protocole de couche de contrôle d'accès au support de service de diffusion et de multidiffusion - Google Patents

Procédé destiné à envoyer une unité de données de protocole de couche de contrôle d'accès au support de service de diffusion et de multidiffusion Download PDF

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Publication number
WO2009062355A1
WO2009062355A1 PCT/CN2007/003980 CN2007003980W WO2009062355A1 WO 2009062355 A1 WO2009062355 A1 WO 2009062355A1 CN 2007003980 W CN2007003980 W CN 2007003980W WO 2009062355 A1 WO2009062355 A1 WO 2009062355A1
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Prior art keywords
broadcast service
multicast broadcast
scheduler
access control
time
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PCT/CN2007/003980
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English (en)
Chinese (zh)
Inventor
Jianquan Song
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ZTE Corp
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ZTE Corp
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/30—Resource management for broadcast services

Definitions

  • the present invention relates to the field of communications, and in particular, to a method for transmitting a multicast broadcast service medium access control layer protocol data unit.
  • MCBCS Multicast and Broadcast Service
  • SPWG Service Provider Work Group
  • MBS An MBS service that is accessed by a single base station (BS), and an MBS service that is accessed by multiple BSs.
  • BS base station
  • MBS service For multi-BS access MBS services, macro-diversity is supported.
  • MBS MAC PDU Service Medium Access Control Layer Protocol Data Unit
  • the present invention is to solve how to schedule and construct MBS MAC PDUs for multicast broadcast services, and to ensure that MBS MAC PDUs can be transmitted at the same time.
  • the method for transmitting a multicast broadcast service medium access control layer protocol data unit includes the following steps: Step 1: The centralized scheduler in the multicast broadcast service area converts the received multicast broadcast service into The network side multicast broadcast service medium access control layer protocol data unit is sent to the local scheduler in the multicast broadcast service area, where the network side multicast broadcast service medium access control layer protocol data unit includes a multicast broadcast service header and Multicast broadcast service payload; and step 2, the local scheduler is located at the network side multicast broadcast service media access control layer from the centralized scheduler
  • the multicast broadcast service payload in the protocol data unit is configured for the multicast broadcast service medium access control layer protocol data unit of the air interface, and according to the network side multicast broadcast service medium access control layer protocol of the 11 centralized scheduler
  • the multicast broadcast service header in the data unit transmits a multicast broadcast service medium access control layer protocol data unit for the air interface to the mobile terminal.
  • Step 1 includes the following steps: The centralized scheduler selects all or part of the multicast broadcast service packets received as the multicast broadcast service payload; the centralized scheduler calculates the multicast broadcast service payload to be converted into a physical layer burst.
  • the position occupied in the downlink subframe and the absolute time transmitted on the air interface and/or the calculation of the next scheduling information (ie, the next MBS MAP message), the position occupied in the downlink subframe after the transition to the physical layer burst, and the air interface The absolute time of the transmission, and the calculated location information, time information, necessary media access control layer (MAC) to physical layer (PHY) mapping rules, necessary PHY characteristics parameters (including modulation and coding methods, code repetitions) Hybrid automatic repeat request (HARQ) parameter setting, gain (Boosting) parameter, subchannel subcarrier alignment characteristics, etc., and multicast broadcast service payload, location information, time information, necessary MAC to PHY mapping rules And the code length occupied by the necessary PHY feature parameters as the multicast broadcast service header
  • the centralized scheduler decides to select some or all of the multicast broadcast service packets as the multicast broadcast service payload according to one or more of the following contents: the quality of service characteristics of the multicast broadcast service, and the current downlink subframe available resources. , MAC to PHY mapping rules, physical layer characteristics parameters.
  • the centralized scheduler sends the network side multicast broadcast service medium access control layer protocol data unit to all local schedulers in the multicast broadcast service area at one time, or separately to each local according to the delay characteristics of each local scheduler.
  • the scheduler sends a network side multicast broadcast service medium access control layer protocol data unit.
  • the network side multicast broadcast service medium access control layer protocol data unit further includes a check code.
  • the local scheduler also performs integrity check on the network side multicast broadcast service medium access control layer protocol data unit according to the check code. If the network side multicast broadcast service medium access control layer protocol data unit fails the integrity check, the local scheduler determines whether to initiate a retransmission request or perform error processing according to a predetermined policy.
  • the header of the network side multicast broadcast service medium access control layer protocol data unit may be separately sent as control information to the local service scheduler in the MBS Zone.
  • the local scheduler further constructs a multicast broadcast mapping information unit according to the information in the multicast broadcast service header in the data access layer protocol data unit of the network side multicast broadcast service medium.
  • MBS MAP IE Multicast Broadcast Mapping
  • MBS MAP message contains zero or more of the following information elements: Multicast Broadcast Data Information Element (MBS DATA IE;), Extended Multicast Broadcast Data Information Unit (Extended MBS DATA IE), Multicast Broadcast Data Time Diversity Information Unit (MBS DATA Time Diversity IE).
  • the centralized scheduler may also construct these information elements and send them directly to the local scheduler in the multicast broadcast service header.
  • the local scheduler constructs the next one according to the absolute time and location information of the next MBS MAP message in the multicast broadcast service header in the data unit of the network side multicast broadcast service medium access layer protocol.
  • the centralized scheduler output in step 1 includes multiple instances of the multicast broadcast service data information unit (MBS DATA IE, Extended MBS DATA IE, MBS DATA Time Diversity IE), the centralized scheduler is used.
  • MBS DATA IE multicast broadcast service data information unit
  • the output of the device is taught to the upper layer service in the payload: according to the unit number, and the scheduling information of each instance is mapped to the PHY location information, in addition to the absolute time of the corresponding payload air interface transmission of the instance.
  • the centralized scheduler output also needs to include the absolute time of the next scheduling information (ie, MBS MAP message) corresponding to each instance sent over the air interface and the location information mapped to the PHY.
  • the local scheduler sends the payload corresponding to each instance to the absolute time sent by the air interface.
  • step 2 the local scheduler constructs the MAC PDU and the DL MAP IE of the entire downlink subframe according to the multi-base station MBS service scheduling result and the local service scheduling result received from the centralized scheduler, and passes the entire downlink subframe through the air.
  • the interface is sent out.
  • the centralized scheduler calculates the absolute time of sending the multicast broadcast service payload on the air interface according to the delay between the centralized scheduler and the local scheduler reported by each local scheduler, where the delay includes at least the transmission delay. And processing delays.
  • the delay may also include a retransmission delay and a time for the multicast broadcast service to be scheduled in advance.
  • the delay may also include that the local scheduler reports the network side that it receives.
  • the centralized scheduler calculates an absolute time for sending the multicast broadcast service payload on the air interface according to the maximum value in the delay reported by each local scheduler.
  • the centralized scheduler may also receive the time and multicast broadcast of the network access multicast layer medium access control layer protocol data unit that is reported by each local scheduler according to the maximum value of the delays reported by each local scheduler.
  • the time difference between the times determined by the time information in the service header, and the absolute time at which the payload of the multicast broadcast service is sent over the air interface is calculated.
  • the centralized scheduler uses the sum of the current absolute time and the network side delay as the absolute time for transmitting the multicast broadcast service payload on the air interface.
  • the local scheduler reports the reception to the centralized scheduler when the local scheduler receives the network side multicast broadcast service medium access control layer protocol data unit at a later time than the time information determined in the multicast broadcast service header.
  • the local scheduler determines whether to win according to a predetermined policy.
  • the time difference between the time when the network side multicast broadcast service medium access control layer protocol data unit is received and the time determined by the time information in the multicast broadcast service header is reported to the centralized scheduler.
  • the local scheduler adopts different predetermined policies to make a decision.
  • the centralized scheduler according to the physical layer characteristic parameters of the multicast broadcast service (including modulation and coding mode, code repetition number, HARQ parameter setting, and arrangement characteristics of subchannel subcarriers, etc.), multicast broadcast service payload, and downlink subroutine
  • the available radio resources in the frame calculate the position occupied by the multicast broadcast service payload in the downlink subframe after being converted into a physical layer burst.
  • the network side multicast broadcast service medium access control layer protocol data unit further includes a multicast broadcast service downlink interval usage code and a description thereof, and/or a multicast broadcast service arrangement characteristic description identifier and a description thereof.
  • the local scheduler and the centralized scheduler obtain the multicast broadcast by receiving the downlink broadcast service use code of the multicast broadcast service periodically and updated by the network manager and its description and/or the multicast broadcast service arrangement characteristic description identifier and the description thereof.
  • the local scheduler receives the centralized scheduler
  • the present invention can implement a multicast broadcast service supporting macro diversity, that is, all base stations in the MBS Zone range transmit the same at the same time using the same transmission mechanism (using the same subchannel, symbol, modulation and coding scheme, arrangement, etc.) MBS MAC PDIL Additionally, the present invention is capable of integrity checking of MBS MAC PDUs transmitted by the centralized scheduler to the local scheduler.
  • the delay characteristic on the network side can be updated according to the adjustment amount fed back by the local scheduler; the centralized scheduler can send the network side MBS MAC PDU to the local scheduler at one time, so that the local scheduling with less delay is performed.
  • the device will receive the MBS MAC PDU on the network side in advance, and it will take a long time for the cache to be sent over the air interface.
  • the centralized scheduler may also send the network side MBS MAC PDU to the local scheduler according to the delay characteristics of each local scheduler, so that each local scheduler receives the time after being buffered or cached for a small time and then sent through the air interface.
  • FIG. 1 is a schematic diagram of a network composed of a centralized scheduler and a local scheduler; and FIG. 2 is a schematic diagram of inputs and inputs of a centralized scheduler.
  • the macro diversity of MBS is to ensure that each base station in the MBS Zone transmits the same content at the same time and at the same frame position, which requires a two-layer scheduler to cooperate.
  • Local scheduler the local scheduler not only needs to complete the scheduling of local services (including unicast services and MBS services of a single BS), but also needs to be received from the centralized scheduler.
  • the method for transmitting a multicast broadcast service medium access control layer protocol data unit includes the following steps: Step 1: The broadcast scheduler in the multicast broadcast service area receives the broadcast broadcast The service packet is changed to the network side multicast broadcast service medium access control layer protocol data unit and sent to the local scheduler in the multicast broadcast service area i or, wherein the network side multicast broadcast service medium access control layer protocol data unit The multicast broadcast service header and the multicast broadcast service payload are included; and the second scheduler is configured according to the multicast broadcast service payload structure in the network side multicast broadcast service medium access control layer protocol data unit from the centralized scheduler.
  • the centralized scheduler can be located in the access network gateway (ASN-GW), in a selected BS, or in a separate external entity, but the local scheduler is always located in the BS.
  • ASN-GW access network gateway
  • the local scheduler is always located in the BS.
  • the centralized scheduler performs the following functions:
  • the Quality of Service (QoS) feature of the MBS service, the burst characteristics, and the scheduling characteristics of the downlink subframes that need to be occupied select some or all of the MBS packets in the cache as the payload, and calculate The payload is converted into position information occupied in the downlink subframe after the physical layer burst.
  • the next scheduling information is calculated, that is, the location information occupied by the next MBS MAP message in the downlink subframe after being converted into a physical layer burst.
  • next scheduling information is determined, that is, the absolute time that the next MBS MAP message is sent over the air interface.
  • the MBS Header In addition to the length information of the MBS MAC PDU, the MBS Header needs to include synchronization information from the centralized scheduler to the local scheduler. Local scheduling in the base station These synchronization information is used to construct the necessary fields of the MBS MAP IE and the MBS MAP message.
  • the synchronization information includes part or all of the following: current scheduling information, the next scheduling information, that is, the absolute time that the next MBS MAP message is sent over the air interface, and the burst location information at the physical layer.
  • the current scheduling information includes some or all of the following contents: Absolute time of the current scheduled payload transmission, and burst location information occupied by the physical layer, physical modulation and coding mode, number of coding repetitions, HARQ parameter setting, Boosting, multicast connection identifier/ Logical connection identifier (MCID/LCID), and physical layer burst arrangement.
  • the content that is not dynamically changed in the synchronization information can also be transmitted from the centralized scheduler to the local scheduler during the establishment of the MBS service, and is not included in the synchronization information in the MBS Header. 5.
  • the centralized scheduler converts the MBS message into a Media Access Control (MAC) Protocol Data Unit (MBS MAC PDU) of the network side MBS, including the MBS Header and the payload.
  • MAC Media Access Control
  • MBS MAC PDU Media Access Control Protocol Data Unit
  • the centralized scheduler sends the network side MBS MAC PDUs to all local schedulers in the MBS Zone, it can be sent all at once or according to the delay characteristics of each local scheduler.
  • the network side multicast broadcast service medium access control layer protocol data unit can be sent as a control information to the local service scheduler in the MBS Zone.
  • Figure 2 shows the input and output of the centralized scheduler.
  • the output of the centralized scheduler is the network side MBS MAC PDU, which contains the following parts:
  • MBS Header which is a required part.
  • Payload Payload which is a required part.
  • the payload is part or all of the MBS 4 message selected by the centralized scheduler from the receive buffer, or it can be part of an MBS 4 message.
  • Check code which is an optional part.
  • the school weight can be used for data integrity protection.
  • the check code can use a cyclic redundancy check code (CRC).
  • CRC cyclic redundancy check code
  • MBS Header contains some or all of the following fields:
  • the MBS is used to construct the necessary fields for the MBS MAP IE and MBS MAP messages.
  • the MBS MAP message further includes three information elements: MBS DATA IE, Extended MBS DATA IE, MBS DATA Time Diversity IE, and the MBS MAP message may include zero or more instances of each of the above information elements, each of each information element.
  • Each instance contains the relevant field of the scheduling information corresponding to the payload of the instance and the related field of the next MBS MAP message corresponding to the instance.
  • the current scheduling information corresponding to each instance includes some or all of the following contents: the absolute time of the current scheduled payload transmitted on the air interface, and the burst location information occupied by the physical layer, the physical modulation and coding mode, the number of coding repetitions, and the HARQ parameter setting. , Boosting, MCID/LCID, and physical layer burst column mode.
  • the absolute time that the current scheduled payload is sent over the air interface can be represented by a frame number. If the content that is not dynamically changed in the current scheduling information is transmitted from the centralized scheduler to the local scheduler during the MBS service establishment process, it is not included in the synchronization information in the MBS Header.
  • the physical layer burst occupancy location information can be described in the manner of 802.16e-2005 (ie, the starting point of the occupied subchannels and symbols, and the number of subchannels and symbols occupied), or a more optimized description manner. description.
  • the MBS Header also needs to contain current scheduling information for multiple instances.
  • the current scheduling information of each instance needs to increase the starting point and ending sequence number of the payload of the instance in the MBS MAC PDU, which means that each upper layer service in the payload needs to be simultaneously transmitted.
  • the SDUs coming in are numbered.
  • the current scheduling information of an instance includes the upper layer SDU fragment, the current scheduling information includes the fragmentation information in addition to the start and end point information of the corresponding payload of the instance.
  • the 3 MBS Header also needs to include the next scheduling information for each instance. That is, the absolute time of the next MBS MAP message corresponding to each instance is sent over the air interface and the burst location information is occupied at the physical layer.
  • the absolute time transmitted on the air interface in the next scheduling information can be represented by the frame number.
  • the centralized scheduler determines the frame sequence number in the MBS Header (that is, the payload corresponding to each instance and the time each instance sends the next scheduling information on the air interface) as follows:
  • the local scheduler in the MBS Zone (located on the base station) reports the delay between the centralized scheduler and the local scheduler to the centralized scheduler; where the delay includes at least the transmission delay + the processing delay; , the reported delay should consider the retransmission delay, retransmission delay and each retransmission
  • the time required is related to the number of retransmissions allowed.
  • the delay of reporting may also be considered to add delay adjustment, and the time for scheduling the MBS service in advance may be included in the delay adjustment amount.
  • the centralized scheduler records all the delays reported from the local scheduler, and selects the maximum delay as the delay on the network side; the centralized scheduler can add a delay adjustment amount to the network based on the selected maximum delay.
  • the delay of the side, the time of scheduling the MBS service in advance can be included in the delay adjustment amount.
  • the centralized scheduler can update the delay of the local scheduler and the delay of the network side according to the delay adjustment amount fed back by the local scheduler.
  • the centralized scheduler determines that the absolute time sent by the corresponding payload of each instance on the air interface is the current absolute time plus the delay on the network side; the centralized scheduler converts the absolute time sent by the air interface. It is the frame number and is filled in the current scheduling information of each instance in the MBS Header.
  • the centralized scheduler determines the absolute time sent by the next scheduling information of each instance (ie, the next MBS MAP message) on the air interface according to the QoS characteristics of the MBS service, and converts it into a frame number and fills it in the MBS Header.
  • the method for determining the physical layer burst position occupied by the payload corresponding to each instance in the MBS MAC PDU is as follows:
  • the method for determining the next scheduling information corresponding to each instance is as follows:
  • the next MBS MAP message is sent according to the available radio resources in the downlink subframe.
  • the modulation coding method and the number of coding repetitions should be considered. Scope, on the other hand, consider the service QoS characteristics, especially the bit error rate characteristics allowed by the service. If MBS DIUC is used to describe the modulation and coding mode of the MBS service, that is, the burst characteristics of the MBS service, there are multiple ways to implement the local scheduler to obtain the MBS DIUC and its corresponding burst characteristic description.
  • Method 1 The network manager configures different MBS DIUC values and their corresponding burst characteristics, and periodically sends them to the local scheduler within the centralized scheduler and MBS Zone; if a change occurs, immediate synchronization is required.
  • Method 2 The centralized scheduler periodically sends the MBS DIUC and its corresponding burst characterization to the local scheduler. If a change occurs, it needs to be synchronized immediately.
  • Method 3 During the establishment of the MBS service, the centralized scheduler sends the MBS DIUC and its corresponding burst characteristic description to the local scheduler.
  • the centralized scheduler describes the MBS DIUC used in the MBS service or directly describes the burst characteristics. Bring to the local scheduler. If the MBS service can dynamically change the value of the MBS DIUC, the MBS DIUC may be included in the MBS Header of the network side MBS MAC PDU.
  • the MBS Permutation ID used in the downlink subframe of the MBS service indicates the subchannel and the subcarrier arrangement adopted by the burst corresponding to the MBS service in the downlink subframe, and all subchannel multiplexing is generally selected for the MBS service ( The way of FUSC) or the way of partial subchannel multiplexing (PUSC) of all subchannels.
  • Method 1 It can be configured in the Network Manager and sent periodically to the centralized scheduler and the local scheduler within the MBS Zone; if a change occurs, immediate synchronization is required.
  • Method 2 The centralized scheduler periodically broadcasts to the local scheduler. If a change occurs, it needs to be synchronized immediately.
  • Method 3 During the MBS service establishment process, the centralized scheduler sends the MBS Permutation ID and its description adopted by the MBS service to the local scheduler. If for a specific MBS service, the service is in the process of its MBS Permutation
  • the centralized scheduler brings the MBS Permutation ID adopted by the MBS service to the local scheduler. If the MBS service can dynamically change its permutation characteristics, the #column attribute value MBS Permutation ID may be included in the MBS Header of the network side MBS MAC PDU. After the centralized scheduler constructs the network side MBS MAC PDU, it needs to be sent to the MBS Zone. All local schedulers in the range, the centralized scheduler can send all local schedulers all at once or according to the delay characteristics of each local scheduler.
  • the one-time transmission is that the centralized scheduler meets the transmission time required by the local scheduler with the largest delay, and sends the MBS MAC PDU to all local schedulers, so that the local scheduler with less delay needs to cache longer after receiving the MBS MAC PDU.
  • the separate dispatcher is sent to the local scheduler with large delay first, and the local scheduler with small backward delay is sent, that is, all local schedulers receive the MBS MAC PDU sent by the centralized scheduler at almost the same time. , thereby reducing the requirement of a local scheduler cache with a small latency.
  • the local scheduler in the base station performs the following functions: 1. Receives MBS MAC PDUs from the centralized scheduler; if the network side MBS MAC
  • the integrity face is first performed. If the integrity check is performed, on the one hand, the MBS MAP IE and the MBS MAP message are constructed according to the synchronization information in the MBS Header, and on the other hand, the payload from the centralized scheduler is reconstructed into the air according to the synchronization information in the MBS Header.
  • the MBS MAC PDU of the interface is finally transmitted according to the absolute time sent by the air interface in the synchronization information in the MBS Header, and the MBS MAP PDU mapping of the air interface is sent to the burst in the physical layer.
  • the values of some fields can be directly used, and the values of some fields need to be converted; for example, the local scheduler constructs one of the information elements MBS DATA IE in the MBS MAP message.
  • the value of the frame offset field is constructed according to the frame number corresponding to the MBS Header and the current frame number, and the next scheduling information corresponding to the instance (ie, the next MBS MAP message) is also constructed.
  • the value of the frame offset field is constructed by the frame number corresponding to the MBS Header and the current frame number.
  • the pre-strategy can decide whether to initiate a retransmission request or to handle the error.
  • the error handling includes discarding the MBS service scheduling result of the multiple BSs received from the centralized scheduler.
  • the local scheduler performs local scheduling (including scheduling of MBS services for unicast and single BS), combined with the received scheduling result of the centralized scheduler for MBS services of multiple BSs, the utilization efficiency of the radio resources is improved. Because the scheduling of the MBS service of the multi-BS is always scheduled in advance by the centralized scheduler, when the local scheduler performs local scheduling, the radio resources not occupied by the MBS service of the multi-BS can be used for local scheduling. 4.
  • the local scheduler constructs the MAC PDU and the DL MAP IE of the entire downlink subframe according to the scheduling result of the centralized scheduler and the scheduling result of the local scheduler, and transmits the entire downlink subframe through the air interface.
  • the delay adjustment function from the centralized scheduler to the local scheduler includes: if the time when the local scheduler receives the network side MBS MAC PDU from the centralized scheduler is later than the transmission time of the air interface, the local scheduler calculates the time difference, whether the centralized scheduler uses one-time transmission or separate In the sending mode, the local scheduler needs to report the time difference to the centralized scheduler. If the local scheduler receives the network side MBS MAC PDU earlier than the air interface transmission time, the local scheduler calculates the time difference value and determines whether the difference is sent to the centralized scheduler. If the centralized scheduler uses a one-time transmission policy, the local scheduler needs to compare the time difference to a preset threshold of one.
  • the time difference value needs to be reported to the centralized scheduler. If the centralized scheduler uses a separate policy based on the delay characteristics of each local scheduler, the local scheduler needs to compare the time difference to a preset threshold of 2. If it is greater than the threshold 2, the time difference needs to be reported to the centralized scheduler.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

Cette invention se rapporte à l'envoi d'une unité de données de protocole de couche de contrôle d'accès au support de service de diffusion et de multidiffusion. Le procédé inclut les étapes suivantes : le planificateur centralisé dans la zone de service de diffusion et de multidiffusion convertit le message de service de diffusion et de multidiffusion reçu en une unité de données de protocole de couche de contrôle d'accès au support de service de diffusion et de multidiffusion du côté du réseau, et l'envoie au planificateur local dans la zone de service de diffusion et de multidiffusion, l'unité de données de protocole de couche de contrôle d'accès au support de service de diffusion et de multidiffusion du côté du réseau inclut l'en-tête du service de diffusion et de multidiffusion et la charge réseau du service de diffusion et de multidiffusion ; et le planificateur local construit l'unité de données de protocole de couche de contrôle d'accès au support de service de diffusion et de multidiffusion utilisée de l'interface radio sur la base de la charge réseau du service de diffusion et de multidiffusion dans l'unité de données de protocole de couche de contrôle d'accès au support de service de diffusion et de multidiffusion du côté du réseau, et envoie l'unité de données de protocole de couche de contrôle d'accès au support de service de diffusion et de multidiffusion utilisée pour l'interface radio sur la base de l'en-tête du service de diffusion et de multidiffusion dans l'unité de données de protocole de couche de contrôle d'accès au support de service de diffusion et de multidiffusion du côté du réseau.
PCT/CN2007/003980 2007-11-12 2007-12-29 Procédé destiné à envoyer une unité de données de protocole de couche de contrôle d'accès au support de service de diffusion et de multidiffusion Ceased WO2009062355A1 (fr)

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CN101090525A (zh) * 2007-08-06 2007-12-19 中兴通讯股份有限公司 多播广播业务调度方法

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