[go: up one dir, main page]

WO2009033366A1 - Procédé et appareil de multiplexage de service d'un système de diffusion en multidiffusion - Google Patents

Procédé et appareil de multiplexage de service d'un système de diffusion en multidiffusion Download PDF

Info

Publication number
WO2009033366A1
WO2009033366A1 PCT/CN2008/001589 CN2008001589W WO2009033366A1 WO 2009033366 A1 WO2009033366 A1 WO 2009033366A1 CN 2008001589 W CN2008001589 W CN 2008001589W WO 2009033366 A1 WO2009033366 A1 WO 2009033366A1
Authority
WO
WIPO (PCT)
Prior art keywords
division multiplexing
broadcast multicast
orthogonal frequency
frequency division
cyclic prefix
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.)
Ceased
Application number
PCT/CN2008/001589
Other languages
English (en)
Chinese (zh)
Inventor
Libo Wang
Yu Ding
Xiaodong Yang
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Datang Mobile Communications Equipment Co Ltd
Original Assignee
Datang Mobile Communications Equipment Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Datang Mobile Communications Equipment Co Ltd filed Critical Datang Mobile Communications Equipment Co Ltd
Publication of WO2009033366A1 publication Critical patent/WO2009033366A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H04L27/2605—Symbol extensions, e.g. Zero Tail, Unique Word [UW]
    • H04L27/2607—Cyclic extensions

Definitions

  • the present invention relates to broadcast multicast technology, and more particularly to a service multiplexing method and related apparatus in a broadcast multicast system. Background technique
  • Multimedia Broadcast and Multicast Service broadcasts or multicasts multimedia data to mobile terminals by sharing a transmission link.
  • the purpose is to provide multiple users from one point to the point in an efficient, economical and shared way.
  • Multi-point single-directional downlink multimedia data Current user requirements are demanding high data transmission rates, while high-speed data transmissions require large transmission bandwidths to satisfy. As bandwidth increases, channel frequency selectivity is more pronounced.
  • Orthogonal Frequency Division Multiplex (OFDM) technology introduces cyclic prefix (CP, Cyclic Prefix) technology, which can effectively overcome the effects of frequency selective fading, and OFDM technology can easily support bandwidth expansion and guarantee The technical compatibility of systems with different bandwidths provides strong support for business diversity.
  • LTE Long Time Evolution
  • MBMS in the 3G (B3G, Beyond 3G) system are based on Orthogonal Frequency Division Multiplexing (OFDM).
  • MBMS mobile broadband
  • a single carrier MBMS system It often covers large areas.
  • one MBMS service area includes multiple nodes (Node Bs), or multiple base stations, or multiple cells, using the same frequency resources in each service area to transmit the same data under strict time synchronization conditions.
  • Node Bs nodes
  • UE User Equipment
  • the user equipment needs to diversity the MBMS signals from different Node Bs, different base stations, and different cells, and therefore, the signals required to reach the UE fall on the CP of the OFDM symbol.
  • UE User Equipment
  • the technical problem to be solved by the present invention is to provide a method and apparatus for service multiplexing in an MBMS system, so that the CP can be utilized more effectively and the frequency band utilization of the MBMS system can be improved.
  • An embodiment of the present invention provides a service multiplexing method in a broadcast multicast system, including the following steps: In a broadcast multicast system based on orthogonal frequency division multiplexing, in an area covered by at least two broadcast multicast services a time division multiplexing process on the at least two broadcast multicast services; and orthogonal frequency division multiplexing in a time division multiplexing time slot for carrying the broadcast multicast service based on the coverage of the broadcast multicast service
  • the cyclic prefix length inserted in the symbol is proportional to each other, and according to the size relationship of the coverage of the at least two broadcast multicast services, respectively, each orthogonal frequency division in the time division multiplexing time slot carrying each corresponding broadcast multicast service A cyclic prefix with different length values inserted in the multiplex symbol.
  • the embodiment of the present invention further provides a service multiplexing device in a broadcast multicast system, including: a time division multiplexing unit, configured to be broadcast by at least two in a broadcast multicast system based on orthogonal frequency division multiplexing
  • the at least two broadcast multicast services are time-division multiplexed in the area covered by the overlap of the multicast services;
  • the cyclic prefix insertion unit is configured to be used for carrying the broadcast multicast service based on the broadcast multicast service coverage
  • the relationship between the cyclic prefix lengths inserted in the orthogonal frequency division multiplexing symbols in the time division multiplexing time slot is proportional, according to the size relationship of the coverage of the at least two broadcast multicast services, respectively carrying the corresponding broadcast multicast
  • a cyclic prefix of a different length value is inserted into each orthogonal frequency division multiplexing symbol in the time division multiplexed time slot of the service.
  • FIG. 1 is a schematic structural diagram of service multiplexing in which coverage coverage overlaps in an MBMS system, in which a single MBMS service representing a cell A, a separate MBMS service on behalf of a cell, a separate MBMS service on behalf of a cell C, and a public MBMS service on behalf of a community A, B, and C. ;
  • FIG. 2 is a schematic structural diagram of two service multiplexing in which coverage coverage overlaps in an MBMS system, where represents a small coverage service (cell A separate MBMS service), and a country representative large coverage service (cell A, B, C public MBMS service);
  • FIG. 3a is a schematic diagram showing different numbers of time slots occupied by different coverage areas in an MBMS system multiplexed by TDM;
  • FIG. 3b is a schematic diagram of time slot allocation allocated by different coverage areas in an MBMS system multiplexed by TDM;
  • FIG. 4 is a schematic diagram of a method for overlapping service coverage in an MBMS system according to an embodiment of the present invention
  • FIG. 5 is a schematic structural diagram of an apparatus for overlapping service coverage in an MBMS system according to an embodiment of the present invention. detailed description
  • MBMS services with overlapping coverage areas can be multiplexed in the same MBMS system.
  • MBMS services with overlapping coverage can be reused by Time Division Multiplexing (TDM).
  • TDM Time Division Multiplexing
  • the coverage area overlaps it is also necessary to consider the CP length design inserted in each OFDM symbol in the TDM time slot carrying the MBMS service.
  • the service multiplexing technical solution with overlapping coverage in the MBMS system is:
  • the at least two MBMS services are performed in an area covered by overlapping of at least two MBMS services.
  • a CP of a different length value is inserted in each OFDM symbol in a TDM slot carrying each corresponding service.
  • FIG. 1 is a schematic structural diagram showing service overlap of overlapping coverage in an MBMS system.
  • the MBMS system includes four MBMS services with different coverage ranges, as follows:
  • the coverage of service 1 is cell A
  • the coverage of service 2 is cell B
  • the coverage of service 3 is cell C
  • the coverage of public service 4 of cells A, B, and C is cell A, B, and C.
  • service 1, service 2, and service 3 can be time-multiplexed with service 4 through the same communication system.
  • the single carrier MBMS system includes a small coverage service covering only cell A, and a large coverage service covering cells A, B, and C.
  • UE1 is a user equipment that uses only small coverage services
  • UE2 is a user equipment that uses services shared by cells A, B, and C.
  • the UE1 that uses the cell-specific service receives the MBMS signal of the small coverage service from the cell A, uses the corresponding MBMS service of the own cell, and the UE2 that uses the shared service of the cells A, B, and C pairs the cells from the cells A, B, and C.
  • the MBMS signals of the large coverage service are grouped and used, and the MBMS services shared by the three cells are used.
  • the MBMS system in cell A there is a problem of overlapping service coverage, and the services of the two different coverage areas belong to the same MBMS communication system of the city.
  • the values of N l and N s are from 0 to N. The specific values can be dynamically adjusted according to the requirements of the service. For details, see Figure 3a.
  • time slots corresponding to services of different coverage areas can be allocated continuously (as shown in FIG. 3a), and can also be allocated at intervals.
  • the system uses the TDM method to implement the multiplexing of MBMS services.
  • the design method of the specific CP is shown in Figure 4.
  • the services of different coverages use their respective CPs, and the long CPs are used in large coverage services to satisfy the UE. Divide and combine; use short CPs in small coverage services to improve the efficiency of MBMS systems.
  • the length of the CP is the time delay for the user equipment to receive the multipath signal in the unicast cell, which is generally 5us.
  • the coverage of the small coverage service is only the cell A, which can be small.
  • the value of the length of the coverage service CP is set to 5us.
  • the CP length is set longer because of the need to consider the combination of multiple cell base station signals, which can be covered by the MBMS service. It is determined by the distance between the two farthest base stations that the length of the CP is generally the distance of the two base stations farthest from the large coverage MBMS service divided by the speed of light.
  • a preferred method is to use the number of OFDM symbols in the time slots occupied by the services of different coverage areas.
  • the length of the OFDM symbol is adjusted to be the same as the length of the OFDM symbol of the M short CPs, that is, the time slot occupied by the large coverage service and the time slot occupied by the small coverage service are the same.
  • the length of the data in the OFDM symbol can be adjusted according to the number of OFDM symbols in the time slot occupied by the services of different coverages, so that the OFDM symbol length of the K long CPs is the same as the OFDM symbol length of the M short CPs.
  • the distance between two base stations having the longest distance in the large coverage service is 10 km
  • M 16
  • K 11.0095
  • the number of OFDM symbols is 16 in one slot corresponding to the small coverage service.
  • K value or the M value obtained by such calculation is not an integer or a number that is very close to an integer, then a small range adjustment of the length of the CP or a small range adjustment of the data length of the OFDM symbol can be performed. , so that the calculated K value and M value are integers.
  • the CP length is longer for services with large coverage, and all cells A, B, and C in the coverage range can be guaranteed.
  • the UEs that use the services shared by the cells A, B, and C perform effective diversity and obtain macro diversity gain to improve the quality and reception efficiency of the MBMS service.
  • the CP length is shorter, corresponding to the small coverage.
  • the cell here is only the cell A, there is no problem that the UE performs diversity combining; even if the small coverage service covers several cells, the UE can perform effective diversity combining to improve the frequency band utilization of the MBMS system.
  • the CP length design idea in the service overlap overlapping coverage in the MBMS system proposed here can also be applied to the MBMS system of Time Division Duplex (TDD) and the Frequency Division Duplex (FDD). In the MBMS system.
  • TDD Time Division Duplex
  • FDD Frequency Division Duplex
  • the present invention proposes a method for overlapping service coverage in an MBMS system, which proposes that services with overlapping coverage in the same OFDM-based MBMS system use different time slots for transmission, that is, TDM mode. Reuse.
  • the length of the time slot is the same, and the number of OFDM symbols in each time slot is different, and the specific number of OFDM symbols is determined by the length of the CP.
  • the time slots of different coverage services can be allocated continuously or intermittently, that is, flexible multiplexing can be performed between time slots of different services.
  • the present invention provides a service multiplexing device with overlapping coverage in an MBMS system implementing the technical solution.
  • the device includes: a time division multiplexing unit 51,
  • the at least two broadcast multicast services are time-division multiplexed in an area covered by at least two broadcast multicast services.
  • a cyclic prefix insertion unit 52 configured to be proportional to a cyclic multicast service coverage range, and a cyclic prefix length inserted in each orthogonal frequency division multiplexing symbol in a time division multiplexing time slot for carrying a broadcast multicast service, And according to the size relationship of the at least two service coverages, cyclic prefixes of different length values are respectively inserted into each orthogonal frequency division multiplexing symbol in the time division multiplexing time slot carrying each corresponding service.
  • the cyclic prefix insertion unit 52 determines to insert into the time division multiplexing time slot carrying the broadcast multicast service according to the time extension degree of the multipath signal received by the user equipment of the cell.
  • the cyclic prefix insertion unit 52 determines the time of insertion into the broadcast multicast service according to the distance between the two farthest base stations in the coverage range.
  • a cyclic prefix adjustment unit 53 for determining each of the broadcast multicast systems based on the data length value inserted in each orthogonal frequency division multiplexing symbol and the cyclic prefix length value inserted by the cyclic prefix insertion unit 52.
  • each time division multiplexing time is ensured by adjusting a cyclic prefix length value inserted into each orthogonal frequency division multiplexing symbol.
  • An integer number of orthogonal frequency division multiplexing symbols can be carried in the slot.
  • a data length adjusting unit 54 for determining each of the broadcast multicast systems based on the data length value inserted in each orthogonal frequency division multiplexing symbol and the cyclic prefix length value inserted by the cyclic prefix insertion unit 52.
  • each time division multiplexing time slot is ensured by adjusting a data length value inserted into each orthogonal frequency division multiplexing symbol. It can carry an integer number of orthogonal frequency division multiplexing symbols.

Landscapes

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

Abstract

Un procédé de multiplexage de service d'un système MBMS comprend : dans le système MBMS de l'OFDM et dans la région qui est chevauchée par au moins deux services MBMS, le traitement des deux services MBMS par une modulation TDM ; en fonction de la zone de couverture de service qui est en proportion directe avec la longueur du CP inséré dans chaque symbole OFDM dans des tranches de temps TDM qui supportent un service MBMS, et selon la relation dimensionnelle entre les zones de couverture d'au moins deux services MBMS, l'insertion de CP ayant des longueurs respectives différentes dans chaque symbole OFDM des tranches de temps TDM qui supportent un service MBMS correspondant. Le procédé de multiplexage de service du système MBMS peut utiliser le CP de façon plus efficace et améliorer le taux d'utilisation de la bande.
PCT/CN2008/001589 2007-09-05 2008-09-05 Procédé et appareil de multiplexage de service d'un système de diffusion en multidiffusion Ceased WO2009033366A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CNA2007101214065A CN101383988A (zh) 2007-09-05 2007-09-05 广播组播系统中覆盖范围重叠的业务复用方法及装置
CN200710121406.5 2007-09-05

Publications (1)

Publication Number Publication Date
WO2009033366A1 true WO2009033366A1 (fr) 2009-03-19

Family

ID=40451563

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2008/001589 Ceased WO2009033366A1 (fr) 2007-09-05 2008-09-05 Procédé et appareil de multiplexage de service d'un système de diffusion en multidiffusion

Country Status (2)

Country Link
CN (1) CN101383988A (fr)
WO (1) WO2009033366A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105656597B (zh) * 2014-11-24 2020-02-14 华为技术有限公司 数据传输方法和设备

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1510940A (zh) * 2002-11-06 2004-07-07 ���ǵ�����ʽ���� 用于在移动通信系统中发送和接收控制消息的方法
CN1881968A (zh) * 2005-06-15 2006-12-20 华为技术有限公司 一种减小多径延迟干扰的数据传输方法
CN1960350A (zh) * 2005-11-02 2007-05-09 中兴通讯股份有限公司 一种应用于正交频分复用系统的数据传送方法
CN1993955A (zh) * 2004-06-04 2007-07-04 高通股份有限公司 具有可配置循环前缀长度的无线通信系统
WO2007091724A1 (fr) * 2006-02-08 2007-08-16 Nec Corporation Transmission de services de multidiffusion et d'unidiffusion dans un système ofdma

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1510940A (zh) * 2002-11-06 2004-07-07 ���ǵ�����ʽ���� 用于在移动通信系统中发送和接收控制消息的方法
CN1993955A (zh) * 2004-06-04 2007-07-04 高通股份有限公司 具有可配置循环前缀长度的无线通信系统
CN1881968A (zh) * 2005-06-15 2006-12-20 华为技术有限公司 一种减小多径延迟干扰的数据传输方法
CN1960350A (zh) * 2005-11-02 2007-05-09 中兴通讯股份有限公司 一种应用于正交频分复用系统的数据传送方法
WO2007091724A1 (fr) * 2006-02-08 2007-08-16 Nec Corporation Transmission de services de multidiffusion et d'unidiffusion dans un système ofdma

Also Published As

Publication number Publication date
CN101383988A (zh) 2009-03-11

Similar Documents

Publication Publication Date Title
EP2734003B1 (fr) Procédé et appareil pour affecter une ressource de canal de contrôle d'un noeud de relais
WO2015017999A1 (fr) Procédé et dispositif de transmission et de réception d'informations
WO2013107214A1 (fr) Procédé et appareil de communication sans fil
US9509473B2 (en) Method and device for sending and receiving a reference signal
WO2008061442A1 (fr) Procédé et système pour transmettre un service de diffusion
WO2007144947A1 (fr) Système de radiocommunication
WO2014180270A1 (fr) Procédé, station de base, et terminal d'utilisateur, pour une transmission de ressource de canal physique en multidiffusion
WO2014135002A1 (fr) Procédé et dispositif d'émission pmch
CN101389053B (zh) 一种多媒体广播组播业务的传输方法和系统
EP2288216B1 (fr) Procédé et appareil pour affecter une ressource de canal de contrôle d'un noeud de relais dans une sous-trame de retour
WO2009033366A1 (fr) Procédé et appareil de multiplexage de service d'un système de diffusion en multidiffusion
WO2009009946A1 (fr) Procédé pour réaliser un service de diffusion/multidiffusion multimédia amélioré dans une cellule multiporteuse
CN107197525B (zh) 提升mbms容量的方法及装置
WO2012065510A1 (fr) Procédé et appareil de configuration pour un certain nombre de symboles de canal de commande de liaison descendante physique
WO2010130120A1 (fr) Distribution de sous-trames de liaison descendante, procédé d'acquisition et de transmission d'informations pour un système d'évolution wimax

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 08783681

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 08783681

Country of ref document: EP

Kind code of ref document: A1