WO2010060464A2 - Commande de transmission point à multipoint - Google Patents

Commande de transmission point à multipoint Download PDF

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Publication number
WO2010060464A2
WO2010060464A2 PCT/EP2008/066170 EP2008066170W WO2010060464A2 WO 2010060464 A2 WO2010060464 A2 WO 2010060464A2 EP 2008066170 W EP2008066170 W EP 2008066170W WO 2010060464 A2 WO2010060464 A2 WO 2010060464A2
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WO
WIPO (PCT)
Prior art keywords
service quality
station
point
threshold
receiving
Prior art date
Application number
PCT/EP2008/066170
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English (en)
Other versions
WO2010060464A3 (fr
Inventor
Peter Skov
Chunye Wang
Li Zhang
Original Assignee
Nokia Siemens Networks Oy
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 Nokia Siemens Networks Oy filed Critical Nokia Siemens Networks Oy
Priority to PCT/EP2008/066170 priority Critical patent/WO2010060464A2/fr
Publication of WO2010060464A2 publication Critical patent/WO2010060464A2/fr
Publication of WO2010060464A3 publication Critical patent/WO2010060464A3/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0015—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy
    • H04L1/0019—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy in which mode-switching is based on a statistical approach
    • H04L1/0021—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy in which mode-switching is based on a statistical approach in which the algorithm uses adaptive thresholds
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
    • H04L1/0003—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0026—Transmission of channel quality indication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0027—Scheduling of signalling, e.g. occurrence thereof
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0009—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L2001/0092—Error control systems characterised by the topology of the transmission link
    • H04L2001/0093—Point-to-multipoint

Definitions

  • the invention relates to control of point to multipoint transmissions.
  • Point to multipoint transmissions can be provided in a communication system for example to broadcasting or multicasting content and other data and/or signals to a plurality of users.
  • a communication system can be seen as a facility that enables communication sessions between two or more entities such as mobile communication devices and/or other stations associated with the communication system.
  • Examples of communication systems include fixed line communication systems, such as a public switched telephone network (PSTN), local area networks (LAN) and wireless communication systems, such as a public land mobile network (PLMN) 1 satellite based systems and different wireless local networks such as wireless local area networks (WLAN).
  • PSTN public switched telephone network
  • LAN local area networks
  • PLMN public land mobile network
  • WLAN wireless local area networks
  • wireless or over the air communication signals may be transmitted between transmitting and receiving stations.
  • a user can access the communication system by means of an appropriate communication device.
  • a communication device of a user is often referred to as user equipment (UE).
  • UE user equipment
  • a communication device is provided with an appropriate signal receiving and transmitting arrangement for enabling communications with other parties.
  • a communication device is used for enabling the users thereof to receive and transmit communications such as speech and data.
  • a communication devices provides a transceiver station that can communicate with e.g. a base station of an access network and/or another communications device.
  • a communication device or user equipment may also be considered as being a part of a communication system.
  • the communication system can be based on use of a plurality of user equipment capable of communicating with each other.
  • the communication may comprise, for example, communication of data for carrying communications such as voice, electronic mail (email), text message, multimedia and so on.
  • Users may thus be offered and provided numerous services via their communication devices.
  • Non-limiting examples of these services include two-way or multi-way calls, data communication or multimedia services or simply an access to a data communications network system, such as the Internet.
  • User may also be provided broadcast or multicast content.
  • Non-limiting examples of such content include television and radio programs, videos, advertisements, various alerts and other information that is advantageous to be sent to multiple receivers at the same time.
  • Point-to-point communications may be provided as point-to-point communications or point-to-multipoint communications.
  • Point-to-point communications are known as unicasting.
  • Point-to-multipoint communications are typically provided by means of multicasting or broadcasting. The distinction between these two forms of point to multipoint communications is rather vague but a view is that multicasting requires the user to join a group whereas broadcasting is provided without any interaction between the end-user and an entity responsible for sending the content.
  • a common feature of them is that a shared stream of data can be simultaneously transmitted to a multiple of communication devices. That is, a number of receiving stations can receive the same data transfer flow.
  • MBMS Multimedia Broadcast Multicast Service
  • a communication system may be provided with a point-to- multipoint service entity such as a multimedia broadcast/multicast service (MBMS) server, which is able to broadcast or multicast information to multiple participants over a geographical area.
  • the server can provide an entry point for multicast/broadcast transmissions of a content provider providing broadcast or multicast data to communication devices situated in a geographical area served by the server.
  • Use of the MBMS for point to multipoint transmissions is defined e.g. in the context what is known as 'long term evolution' (LTE) radio access network as specified by the 3 rd Generation Partnership Project (3GPP).
  • LTE long term evolution'
  • any communication device in the area can receive the broadcast.
  • a single cell point to multi-point transmission is provided such that each sector of a sector cell broadcasts independently from each other, and any communication device in a sector can receive the broadcast in that sector.
  • a modulation and coding scheme is provided such that coverage over the whole sector or another defined area is ensured, including any coverage limited areas. That is, the modulation and coding is adapted by selecting a scheme such that all receiving stations in the area will be covered and are thus provided with a satisfactory service.
  • this may cause capacity and/or and efficiency issues. For example, there can be occasions where there are no receiving stations in a coverage-limited region. In such case resources would be wasted because even the worst receiving station listening to the broadcast could have supported a higher layer modulation and coding scheme (MCS) and the network could have delivered the service using less resources.
  • MCS modulation and coding scheme
  • Communication devices connected to an entity such as the MBMS can provide feedback information, for example service quality information in association with Hybrid Automatic Repeat Request (HARQ) mechanism and link adaptation functions.
  • HARQ Hybrid Automatic Repeat Request
  • the latter information may be provided for the purposes of the adaptive modulation and coding (AMC).
  • AMC adaptive modulation and coding
  • the spectral efficiency varies depending on the channel conditions of the different communication devices. If a communication device is located in relatively poor coverage conditions and it attempts to connect to a multimedia broadcast/multicast service (MBMS), this can result low spectral efficiency. This can be so in particular because the communication device would in all likelihood be requesting for several retransmissions and a low, if not the lowest, available modulation and coding scheme (MCS). It would thus be advantageous to avoid situations where the spectral efficiency is unnecessarily made low.
  • MCS modulation and coding scheme
  • Embodiments of the invention aim to address one or several of the above issues.
  • an apparatus for controlling a point to multipoint transmission from a transmitting station the apparatus being configured to determine based on service quality information and a threshold if there are receiving stations within the coverage area of the transmitting station whose service quality is below an acceptable level, and to treat receiving stations whose service quality is determined to be below the acceptable level differently from stations whose service quality is on acceptable level.
  • an apparatus for providing admission control for point to multipoint transmissions from a transmitting station the apparatus being configured to determine, based on service quality information associated with a receiving station within the coverage area of the transmitting station and a threshold whether the receiving station is allowed to access the transmitting station.
  • a method for controlling a point to multipoint transmission comprising transmitting a point to multipoint transmission from a transmitting station, determining based on service quality information and a threshold if there are receiving stations within the coverage area of the transmitting station whose service quality is below an acceptable level, and treating receiving stations whose service quality is determined to be below the acceptable level differently from stations whose service quality is on acceptable level.
  • a method for providing admission control for point to multipoint transmissions from a transmitting station comprising providing service quality information associated with a receiving station within the coverage area of the transmitting station, and determining, based at least partially on the service quality information, and a threshold whether the receiving station is allowed to access the transmitting station.
  • the point to multipoint transmission contol is provided such that information that is associated with receiving stations whose service quality is determined to be below the acceptable level is discarded.
  • At least one request for retransmission is received, and requests for retransmission are discarded from stations whose service quality is determined as being below the acceptable level.
  • the service quality information can be based on at least one of feedback information, channel quality indicator (CQI), signal interference to noise ratio (SINR), long term signal interference to noise ratio, and Hybrid Automatic Repeat Request (HARQ) messages.
  • CQI channel quality indicator
  • SINR signal interference to noise ratio
  • HARQ Hybrid Automatic Repeat Request
  • the determination can be based on information regarding the need of individual stations to report service quality.
  • the spectral efficiency of a radio access system is controlled. For example, the spectral efficiency is maintained above a predefined limit.
  • MCS modulation and coding scheme
  • the threshold can be adjustable.
  • a dynamic trade off between spectral efficiency and coverage may be provided by means of the adjustable threshold.
  • the adjustment can take into account at least one of a relative proportion of stations that are receiving a defined minimum level of service, congestion, and changes in signaling condition.
  • the apparatus may be provided in a base station.
  • the operation may be provided by means of a computer program comprising program code means adapted to perform the required steps.
  • the computer program may be provided on an appropriate computer readable medium. Execution thereof on at least one processor can require interaction with at least one memory.
  • Figure 1 shows an example of a communication system in which the embodiments of the invention may be implemented
  • Figure 2 shows a communication device
  • Figure 3 shows a different access system to than of Figure 1
  • Figure 4 is a flowchart illustrating an embodiment
  • Figures 5 and 6 show results of simulations where an embodiment was tested.
  • certain exemplifying embodiments are explained with reference to wireless or mobile communication systems. Before explaining in detaif the certain exemplifying embodiments, certain general principles of a wireless communication system and mobile communication devices are briefly explained with reference to Figures 1 and 2 to assist in understanding the embodiments.
  • a communication device can be used for accessing various services and/or applications provided via a communication system.
  • the access is provided via an access interface between mobile communication devices 1 and an appropriate wireless access system 10.
  • a mobile device 1 can typically access wirelessly a communication system via at least one base station 12 or similar wireless transmitter and/or receiver node.
  • appropriate access nodes are a base station of a cellular system, a base station of a wireless local area network (WLAN) and/or WiMax (Worldwide Interoperability for Microwave Access).
  • Each mobile device 1 may have one or more radio channels open at the same time and may receive signals from more than one base station and/or other communication device.
  • a base station is typically controlled by at least one appropriate controller entity 13 so as to enable operation thereof and management of mobile communication devices in communication with the base station.
  • the controller entity is typically provided with memory capacity and at least one data processor 14.
  • the control entity can be interconnected with other control entities.
  • the base station node 12 is connected to a data network 20 via an appropriate gateway 15.
  • a gateway function between the access system and another network such as a packet data network may be provided by means of any appropriate gateway node, for example a packet data gateway and/or an access gateway.
  • a communication system may thus be provided by one or more interconnect networks and the elements thereof, and one or more gateway nodes may be provided for interconnecting various networks.
  • Figure 1 shows a point-to-multipoint service node 22 which is connected to the data network 20.
  • Node 22 may be provided, for example, by a multimedia broadcast multicast service server.
  • communications between the mobile device 1 and the broadcast multicast service server 22 are routed via the data network 20, the gateway 15 and the base station system 12 and 13.
  • a different arrangement may be provided for enabling communications between a base station and a point to multipoint service node.
  • the point-to-multipoint service node 22 may be configured to provide content delivery functions for a Multimedia Broadcast/Multicast Service (MBMS) or similar.
  • the service node 22 may be provided by a server which is configured to broadcast or multicast information to multiple participants over a geographical area or a plurality of geographical areas.
  • the service node 22 may serve as an entry point for transmissions of a content provider providing broadcast or multicast data to communication devices situated in a geographical area served by the service node 22.
  • Figure 2 shows a schematic, partially sectioned view of a communication device 1 that can be used for reception of broadcast or multicast content from at least one base station.
  • the communication device can provide a receiving station in a system of transmitting and receiving stations.
  • An appropriate mobile communication device may be provided by any device capable of sending and receiving radio signals 11.
  • Non-limiting examples include a mobile station (MS), a portable computer provided with a wireless interface card or other wireless interface facility, personal data assistant (PDA) provided with wireless communication capabilities, or any combinations of these or the like.
  • MS mobile station
  • PDA personal data assistant
  • the mobile communication device of Figure 2 may be used for various purposes.
  • the mobile communication device may be used for voice and video calls, for accessing service applications provided via the data network 20 and/or for receiving and displaying or otherwise presenting to the user broadcast or multicast content.
  • the mobile device 1 may receive signals via an appropriate radio receiver of the mobile device.
  • the receiver is designated schematically by block 7.
  • the receiver may be provided for example by means of a radio part and associated antenna arrangement.
  • the antenna arrangement may be arranged internally or externally to the mobiie device.
  • the receiver arrangement of the mobile device may be configured for enabling tuning to different carrier frequencies.
  • a mobile device is also typically provided with at least one data processing entity 3, at least one memory 4 and other possible components 9 for use in tasks it is designed to perform.
  • the data processing, storage and other entities can be provided on an appropriate circuit board and/or in chipsets. This feature is denoted by reference 6.
  • the user may control the operation of the mobile device by means of a suitable user interface such as key pad 2, voice commands, touch sensitive screen or pad, combinations thereof or the like.
  • a display 5, a speaker and a microphone are also typically provided.
  • a mobile device may comprise appropriate connectors (either wired or wireless) to other devices and/or for connecting external accessories, for example hands-free equipment, thereto.
  • the mobile communication device 1 can be configured to provide service quality related information and to communicate that information to the base station 10. For example, the mobile communication device can generate and communicate information relating to the quality of the received signals and/or data.
  • the communication device may also be configured to generate and transmit messages in accordance with the Hybrid Automatic Repeat Request (HARQ) mechanism, for example ACK/NACK (acknowledged / not acknowledged) messages.
  • HARQ Hybrid Automatic Repeat Request
  • ACK/NACK acknowledgenowledged / not acknowledged
  • FIG. 3 shows another access system scenario where the invention may be embodied.
  • a base station 32 provides a plurality of sectors 35 to 38.
  • the base station is controlled by a controller 33 such that each section can broadcast or multicast messages independently to mobile devices 1 within the area of the respective sector.
  • a station transmits to a plurality of receiving stations within its coverage area.
  • One or more of the receiving stations may be located in relatively bad signalling conditions, and thus the reception quality and service quality may not be on an acceptable level.
  • Such stations can be identified at 102 based on a service quality threshold and information about the service quality the communications devices receive. Upon determination of existence of such stations information regarding them can be discarded from feedback information that is used as a basis of control decisions. Thus the subsequent control actions at 104 can be based on feedback information from such receiving stations only whose quality of service is determined as being good enough.
  • the control mechanism of this embodiment thus provides a point to multipoint system where different treatment of different receiving stations can be provided.
  • the control mechanism can be used to select an appropriate modulation and coding scheme (MCS) for a transmission and/or select communication devices that are to be used as basis of making a particular control decision.
  • MCS modulation and coding scheme
  • Such control mechanism can be advantageously employed to avoid unnecessary decrease in the overall spectral efficiency because it ignores receiving stations that would anyway not get good enough service but would nevertheless affect the service quality of other receiving stations and eat capacity from the base station for nothing.
  • the embodiment provides advantage in that the performance of the point to multipoint operation can be improved in terms of spectral efficiency.
  • control of point to multipoint transmissions such as broadcasting or multicasting can be provided such that different control is applied to different receiving stations based on information from an uplink feedback mechanism.
  • a feedback mechanism provided in a point to multipoint system such as a multimedia broadcasting multicasting service (MBMS) or similar can be used to provide appropriate service quality information to be used a basis for decision making in this regard.
  • the control is applied based on, at least partially, information that is associated with a feedback set maintained by the base station.
  • a feedback set is a list of communication devices that need to report service quality. The list may be used e.g. such that communication devices in very good conditions may not need to report at all.
  • control can be such that communication devices on the list can be treated differently than those that are not on the list.
  • the devices not on the list but nevertheless in the 'slow reporting' scheme may also be treated differently that communication devices on the list and/or communication devices that do not need to report at all.
  • control mechanism can be provided in association with the base station 10, and more particularly by the controller 13.
  • controller mechanism can be provided by means of the controller 33.
  • the controller can be configured to handle at least the radio interface related aspects of the control function.
  • the network operator can use the control mechanisms to tradeoff between spectral efficiency and coverage of the point to multipoint service.
  • control mechanism can be viewed as a trade-off between spectral efficiency and coverage.
  • the embodiments are based on the notion that communication devices with poor connection can be sacrificed because it would cost too much resources to try to cover also them, and even then these communication devices might not be served with satisfactory quality.
  • a parameter associated with the service quality of a mobile communication device is used as a basis in controlling which communications devices should be allowed to access the MBMS service at a given moment.
  • the parameter may be, for example, a long term signal interference to noise ratio (SiNR).
  • SiNR signal interference to noise ratio
  • the long term SINR can be measured and determined by the communications devices or be based on measurements by the communication devices.
  • the SINR can be reported to the base station on request, periodically, or based on a trigger by a predefined event.
  • the threshold is adjustable. By adjusting the threshold, a dynamic trade off between spectral efficiency and coverage can be achieved. For example, the adjustment can take into account factors such as the relative proportion of communication devices that are receiving a defined minimum level of service, congestion, changes in signaling condition and so on.
  • a point to multipoint service facilitating a single- cell point-to-multipoint broadcasting supports adaptive modulation and Hybrid Automatic Repeat Request (HARQ). Similar control mechanism as described above can be used in association with link adaptation and Hybrid Automatic Repeat Request (HARQ) decisions to discard feedback information from communications devices whose geometry or other feedback information parameter describing the quality of service is found to be below a predefined threshold.
  • HARQ Hybrid Automatic Repeat Request
  • Service quality information can comprise parameters such as Channel Quality Indicator (CQI) and/or information messages sent in association with the Hybrid Automatic Repeat Request (HARQ) mechanism, for example ACK/NACK (acknowledged / not acknowledged) messages.
  • CQI Channel Quality Indicator
  • HARQ Hybrid Automatic Repeat Request
  • the Channel Quality Indicator is a short term signal interference to noise ratio (SlNR) measurement.
  • a communication device can create the Channel Quality Indicator (CQI) and report it in uplink (UL) on a control channel.
  • the CQI is typically reported with a rate of one report per 5-500 ms.
  • CQI can be used by the controller as a basis of determination of an appropriate controi action, for example selection of an appropriate modulation and coding scheme (MCS) for the transmission.
  • MCS modulation and coding scheme
  • the controller can also use the CQi as a basis to determine whether a communication device should be considered in the MCS selection procedure or not. If the CQI is used as a sole parameter in the determination, the controller can simply check if the CQI is below or above a CQI threshold.
  • the control mechanism may, for example, detect that a particular receiving station has sent or stations within a particular section of a base station coverage area have sent a predefined number of NACK (not acknowledged) messages within a predefined time period. This indicates that the one or more stations are not receiving the data transmission on a good enough service level.
  • the threshold can be set such that 10 NACK messages for 20 transmissions would result a determination that the service quality is not acceptable.
  • the mechanism could also work other way around, and consider that those receiving stations that do not positively acknowledge all, or a certain amount of the data packet, say at least 95% of the data packets, are not served properly, and shall be treated differently.
  • a station such as a communication device can be allowed to access an access system only if the service quality it receives satisfies a predetermined criteria. For example, if the signal interference to noise ratio (SINR) of a communication device is below a threshold the communication device is not allowed to access the system because it would reduce the spectral efficiency below a limit set by the operator while it may still not receive a satisfactory service quality.
  • SINR signal interference to noise ratio
  • MCS modulation and coding scheme
  • Admission control for the pint to multipoint transmissions may be provided entirely by the access system. However, it is also possible to distribute the control so that is is provided at least partly by the receiving stations.
  • a transmitting station of a radio access network may transmit a threshold to the user equipments. The threshold can be sent to the user equipments for example in a broadcast channel.
  • Figure 5 illustrates Cumulative distribution function (CDF) of throughput with and without proposed mechanism in the case of 10 user equipment.
  • the threshold was set to be -4, -5, and -6 dB, respectively.
  • the observed gain in throughput was 22% when the threshold was set to -5 dB.
  • Figure 6 illustrates the Cumulative distribution function (CDF) of Block Error Rate (BLER) with and without proposed mechanism in case of 10 user equipment.
  • the threshold was set to -4, -5, and -6 dB, respectively. It was noted that the coverage requirement was met when threshold was -5 dB.
  • the control mechanism proactively neglects such receiving communication devices in the coverage area which anyway would not have reached the quality target.
  • a coverage target e.g. 95 % of the communications devices should have 1 % residual Block Error Rate (BLER) or lower
  • BLER Block Error Rate
  • the communication devices can access the communication system based on various access techniques, such as code division multiple access (CDMA), or wideband CDMA (WCDMA), the latter technique being used by communication systems based on the third Generation Partnership Project (3GPP) specifications. Other examples include time division multiple access (TDMA), frequency division multiple access (FDMA), space division multiple access (SDMA) and so on.
  • CDMA code division multiple access
  • WCDMA wideband CDMA
  • TDMA time division multiple access
  • FDMA frequency division multiple access
  • SDMA space division multiple access
  • a network entity such as a base station provides an access node for communication devices. It is noted that in certain systems, for example those based on the 3G WCDMA, a base station is called 'Node B'.
  • Evolved Universal Terrestrial Radio Access An exemplifying implementation may therefore be in the context of an evolved Universal Mobile Telecommunications System (UMTS), Terrestrial Radio Access Network (E-UTRAN).
  • E-UTRAN An Evolved Universal Terrestrial Radio Access Network (E-UTRAN) consists of E-UTRAN node Bs (eNBs) which are configured to provide both base station and control functionalities of the radio access network.
  • the eNBs may provide E-UTRA features such as user plane Radio Link Control/Medium Access Control/Physical layer protocol (RLC/MAC/PHY) and control plane Radio Resource Control (RRC) protocol terminations towards the mobile devices.
  • RLC/MAC/PHY Radio Link Control/Medium Access Control/Physical layer protocol
  • RRC Radio Resource Control
  • Embodiments of the present invention may be used with the proposed LTE (Long term evolution) system suggested in the 3GPP forum.
  • the above described control apparatus could be used in a packet scheduler of a LTE eNode-
  • the required data processing apparatus and functions of the control mechanism and the communication device may be provided by means of one or more data processors.
  • the data processor may be provided by means of, for example, at least one chip. Appropriate memory capacity can also be provided.
  • Appropriate data processing may be provided in a processing unit provided in association with a base station of a mobile communication system. The data processing may be distributed across several data processing modules.
  • the above described functions may be provided by separate processors or by an integrated processor.
  • An appropriately adapted computer program code product or products may be used for implementing the embodiments, when loaded on an appropriate data processing apparatus, for example in a processor apparatus 13 associated with the case station 10 shown in Figure 1.
  • the program code product for providing the operation may be stored on and provided by means of an appropriate carrier medium.
  • An appropriate computer program can be embodied on a computer readable record medium. A possibility is to download the program code product via a data network.

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  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Artificial Intelligence (AREA)
  • Physics & Mathematics (AREA)
  • Probability & Statistics with Applications (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention porte sur un appareil et sur un procédé permettant de commander une transmission point à multipoint à partir d’une station de transmission. L’appareil est configuré pour déterminer, sur la base d’informations concernant la qualité de service et d’un seuil, s’il existe des stations de réception dans la zone de couverture de la station de transmission pour lesquelles la qualité de service se trouve en dessous d’un seuil acceptable. Si de telles stations sont détectées, elles peuvent être traitées différemment des stations pour lesquelles la qualité de service présente un niveau acceptable.
PCT/EP2008/066170 2008-11-25 2008-11-25 Commande de transmission point à multipoint WO2010060464A2 (fr)

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WO2010060464A3 WO2010060464A3 (fr) 2010-10-21

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1154660A2 (fr) * 2000-05-12 2001-11-14 NTT DoCoMo, Inc. Provision d'un service multidiffusion avec qualité de réception suffisante vers des terminals sans fils
EP1638362A2 (fr) * 2004-09-17 2006-03-22 Lucent Technologies Inc. Opération ARQ hybride pendant la commutation douce dans un système sans fil

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EP1154660A2 (fr) * 2000-05-12 2001-11-14 NTT DoCoMo, Inc. Provision d'un service multidiffusion avec qualité de réception suffisante vers des terminals sans fils
EP1638362A2 (fr) * 2004-09-17 2006-03-22 Lucent Technologies Inc. Opération ARQ hybride pendant la commutation douce dans un système sans fil

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