WO2011009354A1 - Procédé et système permettant de recevoir des données de service - Google Patents

Procédé et système permettant de recevoir des données de service Download PDF

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Publication number
WO2011009354A1
WO2011009354A1 PCT/CN2010/074098 CN2010074098W WO2011009354A1 WO 2011009354 A1 WO2011009354 A1 WO 2011009354A1 CN 2010074098 W CN2010074098 W CN 2010074098W WO 2011009354 A1 WO2011009354 A1 WO 2011009354A1
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WO
WIPO (PCT)
Prior art keywords
subframe
service data
information
ofdm symbols
pdcch
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PCT/CN2010/074098
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English (en)
Chinese (zh)
Inventor
苟伟
马子江
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中兴通讯股份有限公司
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Publication of WO2011009354A1 publication Critical patent/WO2011009354A1/fr

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Classifications

    • 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
    • H04L5/0094—Indication of how sub-channels of the path are allocated
    • 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 the field of Long Term Evolution (LTE) system technology, and in particular, to a multimedia broadcast multicast service (MBMS) service data receiving method and system.
  • LTE Long Term Evolution
  • MBMS multimedia broadcast multicast service
  • the 3rd Generation Partnership Project (3GPP) proposed the MBMS service, which is a technology that transmits data from one data source to multiple targets, and implements the network.
  • the sharing of resources (including the core network and the access network) improves the utilization of network resources (especially air interface resources).
  • MBMS defined by 3GPP can not only realize plain text low-rate message broadcast and multicast, but also enable high-speed multimedia service broadcast and multicast, providing a variety of rich video, audio and multimedia services, which undoubtedly conforms to future mobile
  • 3G 3rd Generation, 3rd generation mobile communication technology
  • the MBMS service can be transmitted in a hybrid carrier mode, and the hybrid carrier mode means that the unicast service (Unicast) and the multicast service (MBMS service) are transmitted on the same carrier in a time division multiplexing manner, and time division multiplexing is performed.
  • the smallest unit is a sub-frame.
  • a subframe configured by using the MBSFN (Multimedia Broadcast Broadcast Service Single Frequency Network)-SubframeConfiguration parameter in the SIB (System Information Block) 2 is called an MBSFN subframe.
  • the main function of the MBSFN subframe is to transmit MBMS services, but not all MBSFN subframes are used. Contains MBMS business.
  • the feature of the MBSFN subframe in the LTE R9 is that the extended cyclic prefix is used, and the first or two OFDM (Orthogonal Frequency Division Multiplexing) symbols are used to carry the unicast.
  • the service control information that is, the PDCCH (Physical Downlink Control CHannel)
  • PDCCH Physical Downlink Control CHannel
  • the remaining OFDM symbol resources are used to transmit the MBMS service data. Since the unicast service data is not transmitted on the remaining OFDM symbols, but the MBMS service data is transmitted, after receiving the PDCCH of the MBSFN subframe, the unicast receiving end does not receive the data on the following OFDM symbols; and the MBMS service receiving end does not. The PDCCH on the previous OFDM symbol is received, and the MBMS service data on the following OFDM symbol is directly received.
  • the reception of the MBMS service data in the LTE R9 system has the following problems: Since the receiving end cannot determine the resource condition occupied by the service data to be received, the service data is blindly attempted to be parsed when receiving, and the received service data is invalid due to the decoding error. . Summary of the invention
  • the technical problem to be solved by the present invention is to provide a method and system for receiving service data, so that the receiving end can receive and parse the service data according to the determined resource condition of receiving the service data.
  • the present invention provides a method for receiving service data, including: receiving, by a receiving end, resource occupation information of control information in a subframe to be received;
  • the resource occupation information of the control information is the number of orthogonal frequency division multiplexing OFDM symbols occupied by the PDCCH in the subframe.
  • the resource occupation information of the service data is the number of OFDM symbols occupied by the service data in the subframe. Or resource information within an OFDM symbol.
  • step of determining, by the receiving end, the resource occupation information of the control information in the subframe to be received receiving and parsing information on the physical control format indication channel PCFICH in the first OFDM symbol of each of the subframes to determine The number of OFDM symbols occupied by the PDCCH; or
  • the number of OFDM symbols occupied by the PDCCH in all MBSFN subframes in the predetermined MBSFN area in the BCCH modification period in which the MBSFN subframe is located is determined by receiving information on the PCFICH in a MBSFN subframe in the predetermined MBSFN area.
  • the high layer signaling includes dynamic scheduling information of the MBMS service of the multimedia broadcast multicast service, multicast control channel MCCH information or broadcast control channel BCCH information.
  • the system lnfoModification parameter is modified by monitoring system information in the paging message to determine the number of OFDM symbols occupied by the PDCCH.
  • the step of determining the resource occupation information of the service data in the subframe according to the resource occupation information of the control information includes:
  • Determining whether there is an important system message in the subframe if there is no important system message in the subframe, subtracting the total number of OFDM symbols of the subframe from the number of OFDM symbols occupied by the PDCCH, that is, obtaining the Decoding the number of OFDM symbols occupied by the service data; if there are important system messages in the subframe, subtracting the total OFDM symbol number of the subframe from the OFDM occupied by the PDCCH After the number of symbols, the number of OFDM symbols occupied by the important system message or the resources in the occupied OFDM symbol is subtracted to obtain resource occupation information of the service data.
  • the subframe includes a non-multicast multicast single frequency network MBSFN subframe, or an MBSFN subframe used to carry the MBMS service.
  • the service data includes: MBMS service data and/or location service data.
  • the present invention also provides a service data receiving system, including a resource occupation information unit and a receiving unit, wherein:
  • the resource occupation information unit is configured to determine resource occupation information of the control information in the subframe to be received, and calculate resource occupation information of the service data in the subframe according to the resource occupation information of the control information, and then the service The resource occupation information of the data is sent to the receiving unit;
  • the receiving unit is configured to receive and parse the service data according to the resource occupation information of the service data.
  • the resource occupation information of the control information is the number of orthogonal frequency division multiplexing OFDM symbols occupied by the PDCCH in the subframe;
  • the resource occupation information of the service data is that the service data occupies the OFDM symbol number or the OFDM symbol of the subframe Resource information;
  • the resource occupation information unit is set to:
  • the resource occupation information unit is set to:
  • Determining whether there is an important system message in the subframe if there is no important system message in the subframe, subtracting the total number of OFDM symbols of the subframe from the number of OFDM symbols occupied by the PDCCH, that is, obtaining the Describe the number of OFDM symbols occupied by the service data; if there are important system messages in the subframe, subtract the number of OFDM symbols occupied by the PDCCH from the total number of OFDM symbols of the subframe, and then subtract the important The number of OFDM symbols occupied by the system message or the resources in the occupied OFDM symbol obtains resource occupation information of the service data.
  • the subframe includes a non-multicast multicast single frequency network MBSFN subframe, or an MBSFN subframe for carrying a multimedia broadcast multicast service MBMS service.
  • the service data includes: MBMS service data and/or location service data.
  • the present invention can effectively receive the MBMS service data in the current LTE R9 system, and does not require the receiving end to blindly attempt to parse the service data, and does not need to modify the existing sender protocol.
  • FIG. 1 is a schematic flowchart of a service data receiving method according to an embodiment of the present invention
  • FIG. 2 is a schematic diagram showing the composition of a service data receiving system according to an embodiment of the present invention. Preferred embodiment of the invention
  • the core idea of the present invention is: In the LTE system, the receiving end first determines the resource occupancy of the control information in the subframe to be received, and then determines the resource occupancy of the service data in the subframe according to the resource occupancy of the control information, Receive and parse business data.
  • the present invention specifically uses the following technical solutions:
  • the information on the PCFICH (Physical Control Format Indicator Channel) channel in the subframe is used to indicate the number of OFDM symbols occupied by the PDCCH, and the receiving end can determine the OFDM for the PDCCH by receiving and parsing the information of the PCFICH channel. The number of symbols. However, the receiving end does not receive the control information itself in the PDCCH, and only receives the information of the PCFICH channel and parses it.
  • PCFICH Physical Control Format Indicator Channel
  • the high-level signaling may be used to indicate that the receiving end passes the Dynamic Scheduling Information, the MCCH (Multicast Control Channel) information, or the BCCH (Broadcast Control Channel) information of the MBMS service within a certain period (for example, 320 ms).
  • the receiving end can obtain the number of symbols of the OFDM occupied by the MBSFN subframe PDCCH carrying the MBMS service in a certain period.
  • the method for the receiving end to determine the number of OFDM symbols occupied by the PDCCH on the MBSFN subframe that carries the MBMS service includes:
  • the receiving end determines the MBSFN area by receiving a PCFICH of an MBSFN subframe (that is, a subframe of a Physical Multicast Channel (PMCH) constituting the MBSFN area in the LTE) in a certain MBSFN area.
  • a PCFICH of an MBSFN subframe that is, a subframe of a Physical Multicast Channel (PMCH) constituting the MBSFN area in the LTE
  • the receiving end may determine whether the number of OFDM symbols occupied by the PDCCH of the MBSFN subframe in the MBSFN area in the next BCCH modification period occurs by monitoring the system information modification (systemlnfoModification) parameter in the paging message. Variety.
  • the number of OFDM symbols occupied by the PDCCH of the MBSFN subframe in the MBSFN area in the next BCCH modification period does not change. If the systemInfoModification parameter exists, the MBSFN in the next BCCH modification period is indicated. The number of OFDM symbols occupied by the PDCCH of the MBSFN subframe in the area may change. In this case, the receiving end needs to re-receive the first MBSFN subframe in the MBSFN area in the next BCCH modification period to determine all MBSFNs in the MBSFN area. The number of OFDM symbols occupied by the PDCCH of the subframe.
  • the OFDM symbol for transmitting the PDCCH is removed from the total OFDM symbol of the subframe to be received, if some of the remaining OFDM symbols carry important system messages, such as BCCH information and pilots, the message is removed.
  • the remaining resources are the resources used to transmit the service data. If the remaining OFDM symbols in the subframe do not have the BCCH system message and pilot, the remaining OFDM symbols in the subframe are all used for transmitting service data.
  • the service data includes MBMS service data and positioning service data
  • the positioning service data is data for assisting UE positioning, and is ositioning reference signals in LTE.
  • the OFDM symbol of one subframe in LTE is limited, and the total number of OFDM symbols of the same type of subframe is fixed.
  • the extended cyclic prefix there are 12 OFDM symbols in the subframe, and when the standard cyclic prefix is used, there are 14 OFDM symbols in the subframe.
  • the receiving end can obtain the cyclic prefix condition used by the subframe by using related information, so the receiving end can know the total number of OFDM symbols of each subframe.
  • the PCFICH channel is carried on the first OFDM symbol of each subframe, and the information of the PCFICH channel is used to indicate the number of OFDM symbols occupied by the PDCCH, and the PCFICH channel of each cell is located on the first OFDM symbol.
  • the fixed location this fixed location is related to the cell ID (identification), and varies depending on the cell ID.
  • the terminal can know the location information of the PCFICH channel in each subframe.
  • This embodiment describes a procedure of how the receiving end receives MBMS service data in the data domain of the subframe when the PCFICH is used to carry the number of OFDM symbols occupied by the PDCCH.
  • the MBMS service is carried in the MBSFN subframe.
  • the current protocol specifies that the first one or two OFDM symbols of each MBSFN subframe are used for the PDCCH, so that the unicast service is normal. transmission.
  • up to 2 OFDM symbols of the MBSFN subframe carrying the MBMS service transmit the PDCCH, but the subsequent remaining OFDM symbols do not send the unicast service data, but transmit the MBMS service data.
  • the receiving end receives the MBMS service data as follows:
  • Step 101 The receiving end determines the number of OFDM symbols used for the PDCCH in the MBSFN subframe to be received. Receiving information of the PCFICH channel in the first OFDM symbol of each MBSFN subframe received, and parsing the information therein, thereby obtaining the number of OFDM symbols occupied by the PDCCH in the subframe.
  • the receiving end continues to receive the following OFDM symbol data while parsing the PCFICH, because if the receiving end does not receive the subsequent OFDM symbol in the parsing process, the delay of the parsing of the PCFICH may cause subsequent OFDM symbol data. Lost.
  • the present invention can also notify the receiving end through high layer signaling to determine the OFDM symbol occupied by the PDCCH in the MBSFN subframe to be received. Therefore, in other embodiments of the present invention, the receiving end may further determine the number of OFDM symbols occupied by the PDCCH according to the received high layer signaling, so that the number of OFDM symbols used for the MBMS service in the subframe may be indirectly obtained without receiving The number of OFDM symbols occupied by the PDCCH in the subframe is determined in each MBSFN subframe.
  • the PDCCH occupies 1 OFDM symbol in the subframe.
  • the second OFDM symbol can be used to transmit the MBMS service.
  • Step 102 The receiving end determines the number of symbols occupied by the service data in the MBMS subframe to be received.
  • the receiving end learns that the MBSFN subframe uses the extended cyclic prefix according to the protocol, and thus has a total of 12 OFDM symbols. Since the MBMS service data is not used to carry the BCCH, in this embodiment, it is not necessary to consider whether there is an important system message. Thus, except for the first OFDM symbol, 11 OFDM symbol resources behind the subframe are used for the bearer receiving end.
  • the MBMS service data to be received does not include the resources occupied by the pilot if there are bearer pilots in the next 11 symbols.
  • Step 103 The receiving end continues to receive data on all OFDM symbols in the subframe, and finally parses the received MBMS service data according to the related control information of the MBMS service, including channel estimation, decoding, etc., to finally obtain an effective MBMS service. data.
  • This embodiment describes how the receiving end receives the MBMS service data in the data domain of the subframe when the PCFICH is used in conjunction with the BCCH modification period to determine the OFDM number of the PDCCHs of all the MBSFN subframes carrying the MBMS service in a certain MBSFN area. the process of.
  • the MBMS service is carried in the MBSFN subframe, and the current protocol specifies that the first one or two OFDM symbols of each MBSFN subframe is
  • the PDCCH is used to facilitate normal transmission of unicast traffic. In this way, up to 2 OFDM symbols of the MBSFN subframe carrying the MBMS service are sent to the PDCCH, but the unicast service data is not transmitted on the remaining OFDM symbols, but the MBMS service data is transmitted.
  • MCH Scheduling Information is used to indicate which MBSFN subframes are used for PMCH transmission.
  • the receiving end receives the MBMS service data. as follows:
  • Step 201 The receiving end determines the number of OFDM symbols used for the PDCCH in the MBSFN subframe to be received.
  • the receiving end may determine the number of OFDM symbols occupied by the PDCCH by using the following method: in each BCCH modification period, parsing the information in the PCFICH information in a certain MBSFN subframe in the MBSFN area, thereby obtaining the BCCH modification period.
  • the number of OFDM symbols occupied by the PDCCHs of all MBSFN subframes used for PMCH transmission in the MBSFN area is the same.
  • the PCFICH of the first MBSFN subframe in the MBSFN subframe in which the MBMS service in the MBSFN area is located in the MBSFN area is received in the BCCH modification period, so as to determine the MBMS service that is interested in the receiving end in the BCCH modification period.
  • the receiving end can determine whether the number of MBSFN changes in the next BCCH modification period by monitoring the systemlnfoModification parameter in the paging message. If the systemlnfoModification parameter does not exist (if the parameter exists, it indicates that the BCCH is updated in the next modification period, if it does not exist, the update does not occur), then the MBSFN where the MBMS service is located in the MBSFN area in the next BCCH modification period The number of OFDM symbols occupied by the PDCCH of the subframe does not change. If the systemInfo parameter is present, the number of OFDM symbols occupied by the PDCCH of the MBSFN subframe in the MBSFN area in the next BCCH modification period may change.
  • the receiver needs to be heavy in the next BCCH modification period.
  • the first MBSFN subframe in which the MBMS service is located in the MBSFN area is newly received to determine the number of OFDM symbols occupied by the PDCCH of the MBSFN subframe in which the MBMS service is located in the MBSFN area.
  • the receiving end continues to receive the OFDM symbol data subsequent to the subframe while parsing the PCFICH, because if the receiving end does not receive the subsequent OFDM symbol in the parsing process, the delay of the parsing of the PCFICH may result in the following OFDM. Symbol data is lost.
  • the receiving end can determine the number of OFDM symbols occupied by the PDCCH of all MBSFN subframes occupied by the MBMS service that is of interest to one MBC service by receiving the PCFICH once.
  • Step 202 The receiving end determines the number of symbols occupied by the service data in the MBMS subframe to be received.
  • the receiving end can learn the cyclic prefix used by all the MBSFN subframes according to the protocol, so that the OFDM symbol is shared by each MBSFN subframe. Number.
  • the receiving end uses its own feelings
  • the number of OFDM symbols, the remaining OFDM symbols are the MBMS services that are of interest to the receiving end.
  • the receiving end can know the number of OFDM symbols occupied by the MBMS service in the MBSFN subframe in which the MBMS service of the receiver is interested in a BCCH modification period.
  • Step 203 The receiving end receives, according to the learned OFDM symbol used by the MBMS service in the MBSFN subframe to be received, the data in the OFDM symbol in which the MBMS service of the MBMS service is located, and performs analysis, including channel estimation, decoding, and the like. Obtain valid MBMS business data.
  • the MBMS service that is of interest to the receiving end is only one form of the MBMS service that satisfies the predetermined condition, and the predetermined condition can be set as needed.
  • This embodiment describes how the receiving end receives the positioning service data (that is, the data for positioning and the positioning reference signal in LTE) in the data domain of the subframe when the PCFICH is used to carry the number of OFDM symbols occupied by the PDCCH. .
  • the positioning service data that is, the data for positioning and the positioning reference signal in LTE
  • the positioning service uses the data domain of the entire subframe to carry on
  • the control information related to the positioning service is not sent in the control domain of the subframe. Therefore, the control field of the subframe uses several OFDM symbols (sometimes using one OFDM symbol, sometimes using 2 or other numbers) as the control domain (PDCCH) of the subframe, and the receiving end of the receiving positioning service must know Because this directly affects the number of OFDM symbols occupied by the data field after the subframe.
  • the PCFICH is used to indicate that the PDCCH of the subframe occupies several OFDM symbols, and also indirectly informs which OFDM symbol the subframe data field starts from.
  • Step 301 The receiving end determines to wait The number of OFDM symbols used for the PDCCH in the received subframe; the receiving end receives the information of the PCFICH channel in the first OFDM symbol of the subframe, and parses the information therein to obtain the number of OFDM symbols occupied by the PDCCH in the subframe.
  • the receiving end continues to receive data of the following OFDM symbols while parsing the PCFICH.
  • the PDCCH occupies 1 OFDM symbol in the subframe.
  • Step 302 The receiving end determines the number of symbols occupied by the positioning service data in the subframe to be received.
  • the receiving end subtracts the number of OFDM symbols occupied by the PDCCH by the total number of OFDM symbols of the subframe, and the remaining OFDM is the OFDM symbol occupied by the positioning service data.
  • the OFDM symbols carrying the positioning service if there are important system messages, such as BCCH, pilot, then some of the resources occupied by this part are also removed; if there are no important system messages in the OFDM symbols carrying the positioning service, then Remove some of this resource.
  • the total number of OFDM symbols of the subframe which can be learned by the receiving end according to the existing protocol.
  • Step 303 The receiving end continues to receive data on all OFDM symbols in the subframe, and finally parses the received positioning service data according to related control information of the positioning service data, including channel estimation, decoding, etc., to finally obtain effective positioning.
  • Business data including channel estimation, decoding, etc.
  • the service data receiving system 2 includes a resource occupation information unit 21 and a receiving unit 22, where:
  • the resource occupation information unit is configured to determine resource occupation information of the control information in the subframe to be received, and determine resource occupation information of the service data in the subframe according to the resource occupation information of the control information, and The resource occupation information of the service data is sent to the receiving unit;
  • the receiving unit is configured to receive and parse the service data according to the resource occupation information of the service data.
  • control information refers to a PDCCH
  • resource occupation information refers to the number of orthogonal frequency division multiplexing OFDM symbols occupied by the PDCCH in the subframe
  • resource occupation information unit is set to:
  • the receiving system can be applied to a receiving end of an MBMS service or the like.
  • the present invention may have other various embodiments.
  • the subframe may include other non-MBSFN subframes in addition to the MBSFN subframe, and the PCFICH of the multicast service subframe exists in the subframe.
  • the total number of OFDM symbols of the multicast service subframe is also relatively fixed, being 12 or 14.
  • the present invention is applied to the MBMS service and the positioning service by way of example, but is not limited to these two types of services. Therefore, the flow of the present invention is equally applicable.
  • Those skilled in the art can make various phases in accordance with the present invention without departing from the spirit and scope of the present invention. All changes and modifications are intended to be included within the scope of the appended claims.
  • the service receiving method and system provided by the present invention enable the receiving end to receive and parse the service data according to the resource condition occupied by the service data to be received, so that the MBMS service data in the current LTE R9 system can be effectively received, thereby eliminating the need for The receiving end blindly attempts to parse the service data and does not need to modify the existing sender protocol.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention se rapporte à un procédé et à un système permettant de recevoir des données de service. Le procédé selon l'invention comprend les étapes suivantes : un côté de réception détermine les informations de ressources occupées d’informations de contrôle dans une sous-trame devant être reçue ; il détermine les informations de ressources occupées de données de service dans la sous-trame sur la base des informations de ressources occupées d’informations de contrôle ; et il reçoit et il analyse les données de service sur la base des informations de ressources occupées de données de service. Le procédé et le système permettant de recevoir des données de service selon la présente invention rendent possible la réception efficace de données de service d'un service MBMS (Multimedia Broadcast Multicast Service) dans le système R9 LTE (Long Term Evolution) actuel. De cette manière, il n'est pas nécessaire de tenter d'analyser les données de service à l'aveugle du côté de la réception et il n'est pas nécessaire de modifier le protocole existant du côté de la transmission.
PCT/CN2010/074098 2009-07-21 2010-06-18 Procédé et système permettant de recevoir des données de service WO2011009354A1 (fr)

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CN1933379A (zh) * 2005-09-13 2007-03-21 华为技术有限公司 一种广播业务分发方法和系统
CN101247194A (zh) * 2008-03-05 2008-08-20 北京创毅视讯科技有限公司 一种移动多媒体广播系统的文件接收方法
CN101309120A (zh) * 2008-04-17 2008-11-19 中兴通讯股份有限公司 一种终端获取解密解扰信息的方法及装置

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CN1941687A (zh) * 2005-09-29 2007-04-04 华为技术有限公司 广播业务信道与非广播业务信道的复用方法
CN101325684B (zh) * 2007-06-14 2010-10-06 中兴通讯股份有限公司 基于移动多媒体广播的加密控制信息传输方法及系统
CN101483510B (zh) * 2008-01-07 2010-12-08 大唐移动通信设备有限公司 时分双工系统上下行时隙比例信息通知方法及装置

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CN1933379A (zh) * 2005-09-13 2007-03-21 华为技术有限公司 一种广播业务分发方法和系统
CN101247194A (zh) * 2008-03-05 2008-08-20 北京创毅视讯科技有限公司 一种移动多媒体广播系统的文件接收方法
CN101309120A (zh) * 2008-04-17 2008-11-19 中兴通讯股份有限公司 一种终端获取解密解扰信息的方法及装置

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