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WO2008147265A1 - Procédé de transmission de données mbms - Google Patents

Procédé de transmission de données mbms Download PDF

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Publication number
WO2008147265A1
WO2008147265A1 PCT/SE2007/050376 SE2007050376W WO2008147265A1 WO 2008147265 A1 WO2008147265 A1 WO 2008147265A1 SE 2007050376 W SE2007050376 W SE 2007050376W WO 2008147265 A1 WO2008147265 A1 WO 2008147265A1
Authority
WO
WIPO (PCT)
Prior art keywords
mbms
mbms data
transmitted
point
service
Prior art date
Application number
PCT/SE2007/050376
Other languages
English (en)
Inventor
Jiuhui Du
Min Liao
Zengjie Zhang
Original Assignee
Telefonaktiebolaget Lm Ericsson (Publ)
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 Telefonaktiebolaget Lm Ericsson (Publ) filed Critical Telefonaktiebolaget Lm Ericsson (Publ)
Priority to PCT/SE2007/050376 priority Critical patent/WO2008147265A1/fr
Priority to CN200780052972A priority patent/CN101790860A/zh
Publication of WO2008147265A1 publication Critical patent/WO2008147265A1/fr

Links

Classifications

    • 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
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/04—Transmission power control [TPC]
    • H04W52/30—Transmission power control [TPC] using constraints in the total amount of available transmission power
    • H04W52/32—TPC of broadcast or control channels
    • H04W52/322—Power control of broadcast channels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling

Definitions

  • MBMS Broadcast Multicast Service
  • TDD Time Division Duplex
  • TD-SCDMA Time Division-Synchronous Code Division Multiple Access
  • Multimedia Broadcast Multicast Service is a broadcasting service that can be offered via existing GSM and UMTS and other cellular networks.
  • the infrastructure offers an option to use an uplink channel for interaction between the service and the user, which is not a straightforward issue in usual broadcast networks, as for example conventional digital television is only a one-way (unidirectional) system.
  • MBMS uses multicast distribution in the core network instead of point-to-point links for each end device.
  • the MBMS feature is split into the MBMS Bearer Service and the MBMS User Service.
  • the MBMS Bearer Service includes a Multicast- and a Broadcast Mode.
  • the MBMS Bearer Service uses IP Multicast addresses for the IP flows.
  • the advantage of the MBMS Bearer Service compared to legacy UMTS bearer services (interactive, streaming, etc) is, that the transmission resources in the core- and radio network are shared.
  • One MBMS packet flow is replicated by GGSN, SGSN and RNCs.
  • MBMS may use an advanced counting scheme to decide, whether or not zero, one or more dedicated (i.e. unicast) radio channels lead to a more efficient system usage than one common (i.e. broadcast) radio channel.
  • UTRAN MBMS offers up to 256kbit/s per MBMS Bearer Service and between 800kbit/s and 1.7Mbit/s per cell/band.
  • the actual cell capacity depends on the UE capabilities.
  • GERAN MBMS offers between 32kbit/s and 128kbit/s. Up to 4 GSM Timeslot may be used for one MBMS bearer in downlink direction.
  • the actual data rate per Traffic Slot depends on network dimensioning.
  • the type of the channel used by MBMS can be P-t-P (Po ⁇ nt-to-Point) channel or P-t-M (Point-to Multi point) channel according to the number of service users.
  • MBMS has been standardized in various groups of 3GPP (Third Generation Partnership Project), and the first phase standards are found in UMTS release 6. It is developed based on WCDMA (Wide-band CDMA) and WCDMA HSDPA (High Speed Downlink Packet Access) step by step and some devices have been released.
  • WCDMA Wide-band CDMA
  • WCDMA HSDPA High Speed Downlink Packet Access
  • WCDMA HSDPA Long Term Evolution
  • HSP A+ Long Term Evolution
  • LTE Long Term Evolution
  • WCDMA HSDPA provides a streaming type and high power bearer in order to guarantee QoS (Quality of Service) and ensure the broadcasted data can be transmitted to the cell boarder.
  • QoS Quality of Service
  • a fixed MCS Modulation Coding Scheme
  • TD-SCDMA Time Division-Synchronous Code Division Multiple Access
  • WCDMA Time Division-Synchronous Code Division Multiple Access
  • traffic data in TD-SCDMA is transmitted by a beam-formed but omni-directional pattern.
  • data traffic is transmitted in time slots. Therefore, MBMS when applied in TD-SCDMA will face a number of problems such as time slot change for MBMS, power allocation and optimization, channelization code number as well as some other TD-SCDMA specific problems related to the N-carrier technique employed by TD-SCDMA.
  • the solution should be based on the principle of minimizing system interference and optimizing the radio resource assignment.
  • TD-SCDMA adopts a TDD + TDMA mode, and also FDMA, CDMA with short channelization code. All of these will bring flexibility but complexity for radio resource utilization. For example, it is a challenge to deal with the relationship of broadcasted MBMS implement and beam-formed dedicate channels in TD-SCDMA.
  • a method and a system that implements MBMS in TD- SCDMA and which at the same time is efficient in terms of radio resource utilization and which can be used in other future radio systems.
  • the MBMS system is enabled to assign dedicate frequency band(s) or dedicate time slot(s) or other Radio Resource Units to an MBMS service.
  • the solution as described herein is compatible with current common TD-SCDMA solution like N-carrier technique.
  • the solution is based on the principle of minimizing system interference and optimizing the radio resource assignment in order to get optimized coverage and capacity.
  • - Fig. I is a general view of a TD-SCDMA system
  • - Fig. 2 is a view of a protocol for transmitting MBMS data in accordance with a first embodiment
  • - Fig. 3 is a view of a protocol for transmitting MBMS data in accordance with a second embodiment
  • - Fig. 4 is a view of a protocol for transmitting MBMS data in accordance with a third embodiment
  • - Fig. 5 is a view of a protocol for transmitting MBMS data in accordance with a fourth embodiment
  • - Fig. 6 is a view of a protocol for transmitting MBMS data in accordance with a fifth embodiment
  • Fig. 7 is a flow chart illustrating some procedural steps performed when setting up a requested service in a TD-SCDMA system.
  • the system 100 comprises a base station (Node B) 101.
  • the base station 101 serves a number of mobile terminals, sometimes termed User Equipment (UE) 103, located within the area covered by the base station 101.
  • UE User Equipment
  • the base station 101 is also connected to a controller unit, such as a radio network controller node (RNC), 105.
  • RNC radio network controller node
  • the RNC is further adapted to receive MBMS data through the core network as schematically shown by the block 107.
  • the RNC can adopt a number of different schemes for scheduling MBMS data transmission. In the following a number of embodiments will be described in more detail.
  • TS denotes Time Slot and an upward pointing arrow denotes uplink traffic whereas a downward pointing arrow denotes downlink traffic for a particular time slot.
  • a protocol for transmitting MBMS data in a TD-SCDMA system in accordance with a first embodiment is shown,
  • the MBMS traffic both the MBMS Indicator Channel (MICH) and the MBMS Transport Channel (MTCH) is allocated to the TSO (Time Slot 0) and broadcast it like common control channels PCCPCH (Primary Common Control Physical CHannel), SCCPCH (Secondary Common Control Physical CHannel) in TD-SCDMA.
  • PCCPCH Primary Common Control Physical CHannel
  • SCCPCH Secondary Common Control Physical CHannel
  • secondary carriers are used for the transmission of MICH data and MTCH data.
  • TD-SCDMA classifies TSO as a broadcasted slot and TSl to TS7 as beam-formed slots. That is to say, in the TSO all of physical channels in the same or other carriers could use the same weight set to generate a broadcasted signal transmission pattern. In the remaining time slots, the traffic slots, all channels are delivered by a beam-formed pattern to reduce MAI (Multiple Access Interference).
  • MAI Multiple Access Interference
  • N-carrier TD-SCDMA and its evolution systems only the TSO in primary carrier is busy and other TSO in secondary carriers are spare to implement frequency reuse among adjacent cells to reduce inter-frequency interference. So, this MBMS scheme can use the free TSO in secondary carriers to heighten radio resource utilization ratio but at the cost of increasing inter-frequency interference. Due to the isolation effect of frequency guard gap, the increased inter-frequency interference is not significant.
  • a transmission scheme in accordance with another embodiment is shown.
  • a specific dedicate downlink time slot to for the MBMS bearer is allocated.
  • the MBMS service physical layer bearer is allocated a dedicate channel, so in this scheme one or more dedicate slot(s) is assigned as MBMS bearer.
  • the MICH data is transmitted in time slot 0 of the primary carrier of an N-carrier TD-SCDMA, whereas MTCH data is transmitted in dedicated channels such as Time Slot 6 of a first secondary carrier and Time slot S and 6 of a second secondary carrier.
  • This scheme can facilitate handling of transmission power and coverage balance for common control channels, beam-formed dedicate channels and broadcasted dedicate channels.
  • the broadcast dedicate channels are transmitted using the same transmission power setting and beam-forming weights as for the common control channels to get the same coverage.
  • this solution has no impact to TSO so that common control information transmission and reception is guaranteed.
  • a transmission scheme in accordance with yet another embodiment is shown.
  • the MBMS data traffic i.e. the MTCH
  • other services are transmitted in the same traffic slot at different channels. This means that beam-formed and broadcasted information is delivered at the same time, but different weights setting with regard to transmission pattern and transmission power may be employed as is described below.
  • the transmission power and channelization code allocation priority for MBMS channels and other dedicate channels should be set and balanced. Since the MBMS bearer is broadcasted, the beam-formed other bearers will endure a higher interference than other traffic slots without MBMS bearer. In other words it is preferred that the slots with MBMS channels are handled separately from the slots without MBMS channels for radio resource management. This will add some complexity to the Radio Resource Management algorithms.
  • MBMS bearer can also be implemented by using a dedicated carrier or a dedicated time slot in TD-SCDMA.
  • the advantage of such an approach is that it is easy to handle and can get a higher data rate, but it may result in resource waste in some cases.
  • a dedicated time slot is used for the MBMS transport Channel(s) (MTCH)
  • a dedicated secondary carrier is used for the MBMS Transport Channels (MTCH) is depicted.
  • a flow chart illustrating some procedural steps performed when setting up a requested service in a TD-SCDMA system is shown.
  • the system receives a request for a particular service from a UE and determines what type of service that is requested. If an MBMS service is requested the procedure proceeds to a step 703. Otherwise the procedure proceeds to a step 707.
  • the procedure determines if the requested service will result in a P-t-P or P-t-M transmission of MBMS data. If the result of the determination in step 703 is that there will be a P-t-M transmission of MBMS data the procedure proceeds to a step 705. Otherwise the procedure proceeds to a step 707.
  • step 705 the procedure allocates a MBMS specific time slot and carrier.
  • a MBMS specific time slot and carrier In particular one of the transmission schemes and selections of time slot and carrier as described above in conjunction with Figs. 2 - 6 can be employed. Moreover in a particular region the same time slot(s) and carriers) may be used to simplify the receiver in terms of reception requirements and combination complexity of the receiver.
  • radio resource unit allocation to bearer data is performed.
  • TD-SCDMA all of carrier, timeslot, code is set, so that TD-SCDMA can adjust the assigned radio Resource Unit (RU) to a particular UE based on the changed radio link quality measurement, i.e. DCA (Dynamic Channel Allocation).
  • DCA Dynamic Channel Allocation
  • transmission power is allocated to provide acceptable signal strength for all users in the system.
  • N-carrier TD-SCDMA uses 3 carriers and 6 timeslot to bearer data in the uplink and downlink.
  • the MBMS services will require more power to get the same coverage as a corresponding beamformed service. This difference in power requirement between regular data and MBMS data will impact the power split balance in TD-SCDMA with MBMS.
  • load control is performed to ensure that the system does not exceed any threshold levels set to guarantee system performance and MBMS data is transmitted using the selected radio resource units.
  • the system as described herein is hence adapted to assign a dedicated frequency band or a dedicated time slot to MBMS service.
  • a suitable Radio Resource Units such as frequency, time slots etc to transmit the MBMS data
  • the MBMS data is transmitted is transmitted in accordance therewith.
  • the solution is compatible with current common TD-SCDMA solution as possible like N- carrier technique.
  • the solution is based on the principle of minimizing system interference and optimizing the radio resource assignment in order to get optimized coverage and capacity. This is obtained by allocating a suitable carrier and timeslot for MBMS bearer, and to do power split for the slots with broadcasted MBMS and beamformed other bearers.

Landscapes

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

Abstract

L'invention concerne un procédé et un système pour transmettre des données MBMS dans un système TDD (duplexage par répartition dans le temps), tel qu'un système TD-SCDMA (accès multiple par répartition en code synchrone et répartition dans le temps) et ses systèmes évolués, dans lesquels le système, lors de la réception d'une demande de service de télécommunication résultant en une transmission MBMS point à point ou point à multipoint, sélectionne des unités de ressource radio appropriées pour transmettre les données MBMS, et transmet des données MBMS dans les unités de ressource radio sélectionnées.
PCT/SE2007/050376 2007-05-30 2007-05-30 Procédé de transmission de données mbms WO2008147265A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/SE2007/050376 WO2008147265A1 (fr) 2007-05-30 2007-05-30 Procédé de transmission de données mbms
CN200780052972A CN101790860A (zh) 2007-05-30 2007-05-30 发送mbms数据的方法

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/SE2007/050376 WO2008147265A1 (fr) 2007-05-30 2007-05-30 Procédé de transmission de données mbms

Publications (1)

Publication Number Publication Date
WO2008147265A1 true WO2008147265A1 (fr) 2008-12-04

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CN (1) CN101790860A (fr)
WO (1) WO2008147265A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009145688A1 (fr) * 2008-05-30 2009-12-03 Telefonaktiebolaget L M Ericsson (Publ) Canal de liaison montante pour service de diffusion et multidiffusion multimédia point à multipoint

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102685684B (zh) * 2011-03-18 2018-09-04 中兴通讯股份有限公司 一种实现mbms业务连续性的方法、系统和用户设备

Citations (3)

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Publication number Priority date Publication date Assignee Title
WO2006114058A1 (fr) * 2005-04-27 2006-11-02 Huawei Technologies Co., Ltd. Procédé de mesure de système/interfréquence et procédé de détermination de l’exigence de performances de mesure de celui-ci
EP1781051A1 (fr) * 2003-01-06 2007-05-02 Interdigital Technology Corporation Procede et systeme pour le controle de la distribution de services de diffusion de multimedias
EP1802151A1 (fr) * 2003-01-06 2007-06-27 Interdigital Technology Corporation Configuration d'un système de communication sans fil pour assurer la distribution de services de diffusion de multimédia

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1781051A1 (fr) * 2003-01-06 2007-05-02 Interdigital Technology Corporation Procede et systeme pour le controle de la distribution de services de diffusion de multimedias
EP1802151A1 (fr) * 2003-01-06 2007-06-27 Interdigital Technology Corporation Configuration d'un système de communication sans fil pour assurer la distribution de services de diffusion de multimédia
WO2006114058A1 (fr) * 2005-04-27 2006-11-02 Huawei Technologies Co., Ltd. Procédé de mesure de système/interfréquence et procédé de détermination de l’exigence de performances de mesure de celui-ci
EP1853081A1 (fr) * 2005-04-27 2007-11-07 Huawei Technologies Co., Ltd. Procédé de mesure de système/interfréquence et procédé de détermination de l exigence de performances de mesure de celui-ci

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Title
ANDERSON N.W.: "Techniques for improving the coverage and throughput of broadcast services over UTRA TDD cellular networks", PERSONAL, INDOOR AND MOBILE RADIO COMMUNICATIONS, 2004. PIMRC 2004. 15TH IEEE INTERNATIONAL SYMPOSIUM, BARCELONA, SPAIN, 5 September 2004 (2004-09-05) - 8 September 2004 (2004-09-08), PISCATAWAY, NJ, USA, IEEE, pages 244 - 248, XP010754596 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009145688A1 (fr) * 2008-05-30 2009-12-03 Telefonaktiebolaget L M Ericsson (Publ) Canal de liaison montante pour service de diffusion et multidiffusion multimédia point à multipoint

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