WO2015110630A1 - Procédé et système de multidiffusion efficaces appliquant des connexions directes de dispositif à dispositif - Google Patents

Procédé et système de multidiffusion efficaces appliquant des connexions directes de dispositif à dispositif Download PDF

Info

Publication number
WO2015110630A1
WO2015110630A1 PCT/EP2015/051480 EP2015051480W WO2015110630A1 WO 2015110630 A1 WO2015110630 A1 WO 2015110630A1 EP 2015051480 W EP2015051480 W EP 2015051480W WO 2015110630 A1 WO2015110630 A1 WO 2015110630A1
Authority
WO
WIPO (PCT)
Prior art keywords
user device
channel quality
user devices
wireless
user
Prior art date
Application number
PCT/EP2015/051480
Other languages
English (en)
Inventor
Jasper Goseling
Ljupco Jorguseski
Berksan SERBETCI
Haibin Zhang
Jacob Cornelis Van Der Wal
Original Assignee
Koninklijke Kpn N.V.
Nederlandse Organisatie Voor Toegepast-Natuurwetenschappelijk Onderzoek Tno
University Of Twente
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 Koninklijke Kpn N.V., Nederlandse Organisatie Voor Toegepast-Natuurwetenschappelijk Onderzoek Tno, University Of Twente filed Critical Koninklijke Kpn N.V.
Publication of WO2015110630A1 publication Critical patent/WO2015110630A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/14—Direct-mode setup
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/40—Connection management for selective distribution or broadcast

Definitions

  • the invention relates to a method and system for providing data to a plurality of user devices. More specifically, the invention relates to an efficient method and system for multicasting data to a group of devices being enabled to establish device-to-device connections.
  • Multicasting in a traditional and commonly known form pertains to a method for delivering data comprising one or more data packets to a group of user devices simultaneously in a single transmission from a source. If a network is involved, copies of the data packets are created in network elements, such as routers, when required by the topology of the network.
  • IP multicast which is often employed in Internet Protocol (IP) applications for streaming media and Internet television
  • the multicast occurs at the IP routing level, where multicast-enabled IP routers copy and forward, as far as needed, IP data packets addressed to a multicast destination address.
  • MBMS Multimedia Broad- cast/Multicast Service
  • a Multimedia Broad- cast/Multicast Service is known which is designed to deliver broadcast and multicast services from a single base station or group of base stations to multiple user devices receiving the same content.
  • the primary benefit of MBMS is more efficient utilization of network and frequency spectrum resources by ensuring that content to be delivered to several user devices uses, on the path from the source via one or more base stations to user devices, a single channel or bit stream rather than individual bit streams to each user device.
  • a user of a user device terminal, UE
  • the subscription and group joining for the multicast mode services could be done by the mobile network operator, the user or a separate service provider.
  • LTE Long Term Evolution
  • LTE Advanced Long Term Evolution Advanced
  • LTE Advanced also known as the 4G (i.e. fourth generation) mobile communications standard
  • 4G fourth generation
  • mobile user devices terminals
  • terminal mobile user devices
  • UMTS/HSPA also known as 3G
  • Modulation and coding scheme selection in multimedia broadcast of a single frequency network-enabled long-term evolution network by A. Alexiou et al., published in Int. J. Commun. Syst. (201 1 ) discloses methods in LTE systems to improve spectral efficiency by selecting modulation and coding scheme (MCS).
  • MCS modulation and coding scheme
  • the modulation and coding scheme is expressed as an index in a predefined list of several combinations of modulation and coding that may be used in the multicast transmission from a base station to the user devices.
  • the applied modulation determines the number of bits that is carried in one transmitted symbol (examples of modulation include QPSK, 16QAM en 64QAM).
  • redundancy is added to the data bits to be transmitted, thus increasing the total number of bits to be transmitted.
  • a higher channel quality allows a higher order modulation to be applied, e.g. 16QAM instead of QPSK (with a certain bit error ratio as a parameter).
  • the applied coding rate determines the ratio (smaller than one, examples include 4/5, 1/2, 1/3) of the number of data bits to be transmitted over the total number of bits to be transmitted.
  • a higher channel quality also allows less redundancy to be applied, e.g. 4/5 or 1/2 instead of 1/3 (with a certain block error ratio as a parameter).
  • An ordered list of channel qualities may be mapped onto a correspondingly ordered list of combinations of a particular modulation and a particular coding rate (with a certain block error ratio as a parameter).
  • the spectral efficiency for transmission to a single user device is determined by the data rate at which data can be successfully transmitted over a given bandwidth of the wireless radio interface.
  • the spectral efficiency is determined by the data rate averaged over the user devices.
  • SINR signal-to-interference plus noise ratio
  • the spectral efficiency is directly related to the MCS selected for the transmission and that the MCS is selected from a pre-defined list of modulation and coding schemes based on signal-to-interference plus noise ratio (SINR) values as measured by the terminals.
  • SINR-to-MCS mapping a certain expected maximum or target block error rate (BLER, e.g. 10%) is used as a parameter.
  • BLER target block error rate
  • aspects of the present invention may be embodied as a system, method or computer program product. Accordingly, aspects of the present invention may take the form of an entirely hardware embodiment, a software embodiment (including firmware, resident software, micro-code, etc.) or an embodiment combining software and hardware aspects that may all generally be referred to herein as a "circuit," “module” or “system”. Functions described in this disclosure may be implemented as an algorithm executed by a microprocessor of a computer. Furthermore, aspects of the present invention may take the form of a computer program product embodied in one or more computer readable medium(s) having computer readable program code embodied, e.g., stored, thereon.
  • the computer readable medium may be a computer readable signal medium or a computer readable storage medium.
  • a computer readable storage medium may be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing.
  • a computer readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.
  • a computer readable signal medium may include a propagated data signal with computer readable program code embodied therein, for example, in baseband or as part of a carrier wave. Such a propagated signal may take any of a variety of forms, including, but not limited to, electro-magnetic, optical, or any suitable combination thereof.
  • a computer readable signal medium may be any computer readable medium that is not a computer readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device.
  • Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to wireless (using electromagnetic and/or optical radiation), wired, optical fiber, cable, etc., or any suitable combination of the foregoing.
  • Computer program code for carrying out operations for aspects of the present invention may be written in any combination of one or more programming languages, including an object oriented programming language such as Java(TM), Smalltalk, C++ or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages.
  • the program code may execute entirely on a user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer, or entirely on the remote computer or server.
  • the remote computer may be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or the connection may be made to an external computer (for example, through the Internet using an Internet Service Provider).
  • LAN local area network
  • WAN wide area network
  • Internet Service Provider an Internet Service Provider
  • These computer program instructions may be provided to a processor, in particular a microprocessor or central processing unit (CPU), of a general purpose computer, special purpose computer, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer, other programmable data processing apparatus, or other devices create means for implementing the functions/acts specified in the flowchart and/or block diagram block or blocks.
  • a processor in particular a microprocessor or central processing unit (CPU), of a general purpose computer, special purpose computer, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer, other programmable data processing apparatus, or other devices create means for implementing the functions/acts specified in the flowchart and/or block diagram block or blocks.
  • CPU central processing unit
  • These computer program instructions may also be stored in a computer readable medium that can direct a computer, other programmable data processing apparatus, or other devices to function in a particular manner, such that the instructions stored in the computer readable medium produce an article of manufacture including instructions which implement the function/act specified in the flowchart and/or block diagram block or blocks.
  • the computer program instructions may also be loaded onto a computer, other programmable data processing apparatus, or other devices to cause a series of operational steps to be performed on the computer, other programmable apparatus or other devices to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide processes for implementing the functions/acts specified in the flowchart and/or block diagram block or blocks.
  • each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s).
  • the functions noted in the blocks may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the functions noted in the blocks may sometimes be executed in the reverse order, depending upon the functionality involved.
  • the present disclosure presents a method for multicasting data for at least a first user device and a second user device from a telecommunications network over a wireless radio interface.
  • the first user device and the second user device are enabled to establish a connection with the telecommunications network over the wireless radio interface and to establish a direct wireless connection with each other.
  • the registration of the capability and/or enablement for establishing direct connections may be a step in the disclosed method.
  • the method comprises a step in the telecommunications system of receiving channel quality information from the first user device and the second user device, the channel quality information being indicative of a wireless channel quality of a wireless channel between the telecommunications network and the first user device and the second user device, respectively.
  • the channel quality information may comprise any, e.g. quantitative, information that is indicative of the quality of the radio channel or from which quantitative information of the radio channel quality to a user device can be derived.
  • the channel quality information may be an estimate, an approximation or a representation of the actual channel quality.
  • the channel quality information enables, possibly by derivation, to distinguish between poorer and better channel qualities experienced by the user devices.
  • the user devices may report the channel quality information to the telecommunications network, e.g. periodically and/or in response to a request received from the network, using e.g. CQI report.
  • the user device In LTE telecommunications networks for a unicast transmission from the telecommunications network to a user device, the user device periodically reports the channel quality indicator (CQI) to the eNodeB via the Physical Uplink Control Channel (PUCCH) or, if Physical Uplink Shared Channel
  • CQI channel quality indicator
  • PUCCH Physical Uplink Control Channel
  • a CQI report has one of 16 values (numbered from 0 to 15) as specified in TS 36.213 v9.3.0 (see Table 7.2.3-1 ).
  • a CQI report reports an indication of the Signal to Interference and Noise conditions as determined by the terminal.
  • An eNodeB, receiving CQI reports is enabled to select a corresponding modulation and coding scheme (MCS) for the unicast transmission to the user device. This concept may also be applied for reporting the channel quality and selecting the MCS for the multicast transmission. It is well-known in the art how an MCS can be selected on the basis of a channel quality or on the basis of a CQI report; e.g. see the paper by Alexiou et al., quoted in the background section.
  • the modulation and coding scheme for multicast transmission of data in the present disclosure is selected in accordance with the best channel quality, e.g. in accordance with the highest value of a channel quality parameter.
  • a group of user devices is defined containing more than two members (for example on the basis of the capability and/or enablement of direct wireless communication and/or on the basis of a common interest in a particular multicast)
  • a modulation and coding scheme is selected in accordance with the best channel quality, e.g. in accordance with the highest value of a channel quality parameter reported by any of the members of the group.
  • Multicast transmission of the data over the wireless radio interface is performed in accordance with the selected modulation and coding scheme.
  • a system in a telecommunications net- work for multicasting data for at least a first user device and a second user device over a wireless radio interface.
  • the system is configured for performing one or more of the steps disclosed in the previous paragraphs.
  • the system may be (a portion of) a node in the telecommunications network or may be a separate node or be distributed over several nodes.
  • the system is contained in a node, e.g. a base station providing the wireless radio interface, e.g. in an eNodeB.
  • the system is contained in a node in the core network, e.g.
  • a control node such as an MBMS control node (e.g. the multi-cell coordination entity MCE and/or the mobility management entity MME).
  • the system may comprise circuitry programmed with software that, when run by the circuitry, performs the one or more steps of the method.
  • a computer program or (non-transitory) computer program product is presented.
  • a device for use that is configured for reporting, to the telecommunications network, direct connection information relating to user devices being capable to es- tablish a wireless direct connection with the device.
  • an uplink channel associated with a downlink MBMS channel is disclosed.
  • the disclosed aspects enable multicasting data to user devices in a manner saving transmission resources, e.g. use a smaller bandwidth to multicast data at a particular bit rate and to, thus, achieve a higher spectral efficiency.
  • the modulation and coding scheme in accordance with the best channel quality (e.g. in accordance with the highest value of a channel quality parameter received from a user device) in a group of user devices enabled to establish direct wireless communication amongst members in the group, the transmission of the data from the telecommunications network uses a minimum amount of transmission resources.
  • PRBs physical resource blocks
  • data can be transmitted at a higher bit rate using the same number of PRBs
  • PRBs physical resource blocks
  • the modulation and coding rate is selected in accordance with the best channel quality, e.g. in accordance with the highest value of a channel quality parameter, (assuming a particular BLER as a parameter), such that transmission resources are used efficiently.
  • the telecom munica- tions network applies the higher modulation (more bits per symbol transmitted) and/or coding rate (less redundancy) for the multicast transmission, it is likely that not all user devices may be able to correctly receive all the data (e.g. data packets or data segments) from the multicast transmission.
  • the data e.g. data packets or data segments
  • the data can be forwarded over the direct connection(s) from a user device possessing a correctly received data packet to a user device not possessing a correctly received data packet.
  • the disclosed method and system enable delivery of data (e.g. data packets or data segments) by multicast to several user devices in a manner making efficient use of radio transmission resources by selecting, for the multicast transmission of the data on the wireless radio interface, a modulation and coding scheme in accordance with the best channel quality (e.g. the highest value of a channel quality parameter received from the user devices).
  • data e.g. data packets or data segments
  • a modulation and coding scheme in accordance with the best channel quality (e.g. the highest value of a channel quality parameter received from the user devices).
  • the direct wireless connection may both refer to the LTE proposed device-to-device communication and to other forms of wireless communication not necessarily involving the telecommunications network, such as wireless communication over wifi.
  • channel quality information may be expressed in different ways, e.g. in different modalities and/or in different units from e.g. different user devices. Channel quality information expressed in different ways may nevertheless be assessed (e.g. by conversion into a common unit or modality), to determine the best channel quality.
  • the telecommunications network may be assisted by other means than the channel quality information obtained from the user devices when assessing channel quality.
  • One example includes cell parameter information, such as the transmit power of a cell that can be compared to the RSRP to estimate path loss.
  • Another example includes the use of previously received channel quality information, enabling averaging and/or or extrapolation of channel qualities.
  • the method and system relate to an LTE telecom- munications network wherein an MBMS multicast is performed.
  • Other (next) generation wireless access telecommunications networks may also be used.
  • a leader in charge is then defined as the user device having received most data packets correctly.
  • the LiC is the user device that, therefore, does most of the retransmissions using D2D links.
  • the intuition is that since the LiC receives most of the data packets correctly it can retransmit most of the missing packets for all the non-leaders.
  • an intra- cluster rescheduling algorithm is described to reschedule the retransmissions among the user devices in the cluster. It is not described in the article that the modulation and coding rate scheme is selected in accordance with the best channel quality on the wireless radio interface as determined from channel quality information received from a user device.
  • the channel quality information may comprise any quantitative information that is indicative of the quality of the radio channel between the telecommunications network (e.g. a base station) and the user device or from which quantitative information of the channel quality can be derived.
  • the channel quality information received from the first user device and the second user device at least comprises a value, e.g. a value indicative of a Signal-to- Interference plus Noise Ratio (SINR) value, a Reference Signal Received Power (RSRP) value, a Reference Signal Received Quality (RSRQ) value or a value relating to the estimate of path loss on the wireless channel and assessing the wireless channel quality on the basis of the value for the first user device and the second user device.
  • SINR Signal-to- Interference plus Noise Ratio
  • RSRP Reference Signal Received Power
  • RSRQ Reference Signal Received Quality
  • the method and system are configured for receiving direct connection information from user devices being capable to establish a wireless direct connection with at least one user device.
  • the direct connection information may comprise information indicative of the feasibility and/or the quality (e.g. the achievable bit rate) of a direct wireless connection between the user device and another user device, e.g. between the first user device and the second user device and/or e.g. an indication of resources needed (e.g. spectrum bandwidth and/or power) of a direct wireless connection between the user device and another user device to support a specified data rate (e.g. bit rate).
  • the user devices capable to establish a wireless direct connection with at least one user device are registered as members of a group of user devices, the group of user devices comprising at least the first user device and the second user device as members of the group of user devices.
  • Channel quality information is received from the user devices registered as members of the group of user devices and, from the received channel quality information it is determined that the wireless channel quality for the first user device exceeds the wireless channel quality for the remaining members of the group of user devices, the remaining members including the second user device.
  • the modulation and coding scheme is selected in accordance with the wireless channel quality for the first user device and multicast transmission of the data is performed over the wireless radio interface in accordance with the selected modulation and coding scheme.
  • the embodiment assists in defining the group of devices for which the channel quality information is assessed to establish the best wireless channel quality to which the modulation and coding rate is to be set or adapted.
  • the group may be defined by a shared interest in a particular multicast.
  • indications are obtained from at least the first user device and the second user device indicating interest in obtaining the data via multicast.
  • the first user device and the second user device are registered as members of a group of user devices in accordance with the obtained indications.
  • registered members of the group of devices may be requested from the telecommunications network to report at least one of channel quality information and direct connection information with respect to one or more members of the group of devices. Accordingly, the telecommunications network may obtain up to date information to assess the most efficient manner of multicasting the data.
  • the request from the telecommunications network for the information may e.g. be made shortly in advance of the multicast transmission of the data.
  • the request may also be repeated, e.g. periodically and/or made dependent on the information received earlier.
  • the method and system are configured for transmitting the request including information indicating registered members of the group of devices and receiving direct connection information from the user devices with respect to particular or with respect to only other user devices being registered members of the group of devices. From the information indicating registered members
  • the user devices are informed of the user devices for which direct connection information is most relevant for the telecommunications network.
  • the method and system are configured for repeatedly, e.g. periodically, receiving, at least one of channel quality information from the first user device and the second user device and direct connection information from the first user device and the second user device, optionally in response to one or more corresponding requests from the telecommunications network to report the information.
  • FIG. 1 is a schematic illustration of an eMBMS network
  • Fig. 2 is a schematic illustration of an eMBMS telecommunications network according to an embodiment of the invention
  • Figs 3A and 3B depict a time diagram and a flow chart illustrating a method according to a first disclosed embodiment
  • Figs. 4A and 4B depict a time diagram and a flow chart illustrating a method according to a second disclosed embodiment
  • Fig. 5 is a schematic block diagram of a general system or element of a telecommunications network or a user device. DETAILED DESCRIPTION OF THE DRAWINGS
  • Fig. 1 is a schematic illustration of a some components of a telecommunications network 1 connected to a further network 2 comprising a content server 3.
  • the telecommunications network 1 comprises an LTE or 4G telecommunications network suitable for providing enhanced Multimedia Broadcast Multicast Services eMBMS.
  • the content stored in a content server system 3, is provided via a Broadcast Multicast
  • BM-SC Service Center
  • MBMS gateway MBMS gateway
  • eNodeBs base stations
  • eNodeBs base stations
  • eNodeBs base stations
  • Fig. 1 wireless radio interface
  • the BM-SC is, amongst others, responsible for service announcement, security and content synchronization.
  • the MBMS GW distributes user data to the eNodeBs of the E-UTRAN and performs session control signalling towards the
  • MCE Mobility Management Entity
  • MCS modulation and coding scheme
  • the MCE may be a separate entity of the telecommunications network 1 or be part of the eNodeB(s) in the E-UTRAN. Further information on eMBMS can be found in 3GPP TS 36.300, v.1 1.7.0.
  • the MBMS transmission from the different eNodeBs in the E-UTRAN should be received by all user devices 4A-4D interested in and capable of MBMS reception.
  • devices may be located at a cell edge where the path loss between the serving cell / eNodeB and a terminal is highest and/or where the interference from surrounding (non-serving) cells / eNodeBs is highest.
  • MMSFN MBMS single frequency network
  • the multiple eNodeBs are synchronously transmitting the MBMS data towards the user devices 4A-4D such that at the user devices 4A-4D, the transmissions arriving from different cells are received as multipath components of the same signal and not causing interference.
  • the MCE function in the telecommunications network needs to properly select a modulation and coding scheme to be applied for the MBMS transmission.
  • Different user devices 4A-4D will generally perceive different link qualities (channel qualities) for the wireless radio interface.
  • the link quality is influenced by many factors, including noise, interference and path loss.
  • the capability of the user device itself may also influence the perceived link quality, dependent e.g. on the receiver quality and/or the quality of device features such as interference cancellation features.
  • the transfer rate for the user devices capable of and subscribed to / registered for reception of the multicast can only be as high as that rate that corresponds to the poorest link quality. For example, if streaming video is sent with a certain data rate, a user device with a link quality that is poorer than the quality that corresponds with this data rate may be not able to capture all the streaming video data.
  • a user device for a unicast type of transmission, a user device (e.g. one of user devices 4A-4D) periodically reports to the eNodeB the channel quality indicator (CQI) or indirectly the signal-to-interference-and-noise ratio (SINR) experienced in the telecommunications network.
  • CQI channel quality indicator
  • SINR signal-to-interference-and-noise ratio
  • the selected MCS of the physical layer transmission is configured by the MCE to the SINR that the transmission is targeted at, also in combination with the data rate for the MBMS service and with the amount of time-frequency physical resources reserved for the MBMS transmission.
  • User devices that experience a lower SINR than the target value used for the configuration may be una- ble to capture all the data of the MBMS service.
  • Fig. 2 depicts a schematical illustration of an LTE telecommunications network 1 configured for providing eMBMS services according to an embodiment of the disclosure.
  • LTE telecommunications network 1 configured for providing eMBMS services according to an embodiment of the disclosure.
  • the disclosed method and system are equally applicable to other manners of multicasting data, e.g. for 3G MBMS ser- vices.
  • Fig. 2 it is assumed that the disclosed functionality is implemented in the telecommunications network 1 , particularly in the MCE, schematically illustrated as block 20.
  • the MCE and/or the functionality described for block 20 may also be provided in other network nodes, e.g. in one or more eNodeBs.
  • the user devices 4A-4D may also have additional functionality implemented for participating in the disclosed method, schematically illustrated by block 21. Details of blocks 20 and 21 are further described with reference to Figs. 3-5.
  • D2D Device-to-device
  • 3GPP Release 12 The discovery of other D2D-capable user devices and the D2D communication between the user devices are the two basic issues considered in D2D standardization.
  • user devices like user devices 4A-4D, are enabled to discover other user devices for D2D communication.
  • D2D discovery enables using the LTE wireless radio interface (air interface) to identify other user devices that are in proximity.
  • the proximity notion is not only in terms of physical distance, but also based on channel conditions between user devices, signal to interference and noise ratio, throughput, delay, load, etc.
  • user devices 4A-4D may be ena- bled to establish other direct wireless connections or links, e.g. out-of-band links, e.g. using a wifi network.
  • the method is based on the ability of two or more user devices 4A-4D to establish a direct connection from one user device (e.g. user device 4A) to another user device (e.g. user device 4C) for communicating data, where the data may be received as a multicast over the wireless interface of the telecommunications network 1.
  • the telecommunications network 1 acquires the group of user devices that form one MBMS reception group G and their direct connection information, e.g. the D2D communication capabilities.
  • user devices 4A, 4C, 4D constitute a group G of user devices enabled at a particular moment in time to establish direct connections (links).
  • the telecommunications network 1 e.g.
  • the MCE collects periodically information about the channel quality between the serving cell / eNodeB and the user device, as well as about the feasible direct connections (e.g. D2D links) between the user devices.
  • the decision logic at the telecommunications network side e.g. located in the MCE
  • triggers a multicast transmission based on the best channel quality e.g. based on the highest value of a channel quality parameter which is the direct connection-assisted multicast transmission presented in this disclosure.
  • Figs. 3A-3B illustrate a first embodiment of a method applying the system of Fig. 2.
  • functional block 20 in the telecommunications network 1 receives channel quality information from each of the user devices 4A, 4C and 4D of the group G of user devices.
  • the group G of user devices may, as an option, have been established (shortly) in advance of performing the disclosed method in any manner, e.g. by analyzing direct connection information (not shown) from user devices 4A-4D from which information it is concluded that devices 4A, 4B and 4D can be considered as members of group G.
  • the direct connection information is transmitted from the user devices 4A-4D applying functional block 21.
  • the group G may be a dynamic group, i.e. the members of the group may vary over time. This may be dependent on e.g. the mobility of the user devices 4A-4D, the radio conditions, the (re- Configuration of user devices, etc.
  • Semi-permanent groups may also be considered, e.g. for stationary user devices.
  • the channel quality information is indicative of a quality of a wireless channel (e.g. a radio channel) between the telecommunications network 1 and any of the user devices 4A-4D.
  • the channel quality information may comprise any quantitative information that is indicative of the quality of the wireless channel or from which quantitative information of quality of the wireless channel for a user device can be derived.
  • the user devices 4A-4D may periodically report the channel quality information to the telecommunications network 1.
  • the channel quality information received from the user devices at least comprises a value indicative of a Signal-to-lnterference plus Noise Ratio (SINR) value, a Reference Signal Received Power (RSRP) value, a Reference Signal Received Quality (RSRQ) value or a value relating to the estimate of path loss on the wireless channel.
  • SINR Signal-to-lnterference plus Noise Ratio
  • RSRP Reference Signal Received Power
  • RSRQ Reference Signal Received Quality
  • the channel quality information comprises CQI reports as known for unicast transmission, wherein the CQI is based on the estimated SINR.
  • the CQI may be based on any, or any combination, of the SINR, RSRP, RSRQ or path loss estimate.
  • step S32 functional block 20 in the telecommunications network assesses the received channel quality information and derives a measure of the channel qualities from the information for each of the user devices 4A, 4C and 4D.
  • the modulation and coding scheme for multicast transmission of data in the present disclosure is selected in accordance with the best channel quality for the group G of user devices.
  • the MCS is selected in accordance with the best channel quality amongst the members of the group G.
  • functional block 20 in the telecommunications network 1 may find that the channel quality is best for user device 4D and select, set or adapt the MCS in accordance with the channel quality derived for user device 4D.
  • user devices may report equal channel quality information and/or that channel qualities may be derived as equal. If this channel quality is the best channel quality, the MCS is selected in accordance with this channel quality and the MCS is optimal for a plurality of user devices.
  • the telecommunications network performs multicast transmission of the data in accordance with the selected MCS, i.e. in accordance with the MCS selected in accordance with the channel quality determined from the channel quality information reported by user device 4D.
  • the thick arrows in Fig. 3A This is indicated by the thick arrows in Fig. 3A.
  • the lighter greyscale of the arrows indicates a greater likelihood that user devices 4A and 4C, for which a poorer channel quality was determined than for user device 4D, do not appropriately receive all the multicast data since the MCS is not selected in accordance with their channel qualities reported in or derived from the channel quality information received from these user devices 4A, 4C.
  • the user devices 4A, 4C, 4D transmit data parts (e.g. data packets or data segments) that have not been correctly received by one or more user devices in the group G from the telecommunications network's multicast transmission for the group G.
  • D2D direct links e.g. a D2D direct link between 4D and 4C, one between 4D and 4A and one between 4C and 4A
  • enable cooperation between the user devices 4A, 4C and 4D to resolve parts of the data (e.g. data packets or data segments) that have not been obtained directly from the multicast transmission of telecommunications network 1.
  • user device 4A receives lacking data from user devices 4C and 4D and user device 4C receives lacking data from user device 4D.
  • Other group-internal transmission configurations are also possible.
  • telecommunications network and the data exchange arrows between the user devices indicates that the timing of the telecommunications network multicast transmission followed by the transmissions between the group members is not necessarily in the order drawn in Fig. 3A.
  • user device 4C may start transmitting copies of a data part to other user devices in group G as soon as user device 4C has received the data part (either from the telecommunications network's multicast transmission or from a direct connection).
  • the dashed box thus also indicates that multicasting the data from the telecommunications network 1 is not necessarily completed before a user device transmits a received data part on a direct connection.
  • user device 4D transmits data as a multicast for two or more user devices within the group G.
  • the invention may, mutatis mutandis, also be applied to such multicast transmission from a user device.
  • Figs. 4A and 4B disclose another embodiment of the multicast method.
  • user devices 4A-4D are informed (e.g. via a conventional multicast, e.g. a cell broadcast, via separate unicast connections or via a combination) of user devices that are considered as members of a group that is interested in the multicast.
  • the network signal includes information that user devices 4A, 4C and 4D are interested in the multicast.
  • Functional component 21 in each of these user devices then considers the direct connection information for in particular or for only the members.
  • step S42 the relevant direct connection information is transmitted from each of the user devices 4A, 4C and 4D to the telecommunications network 1 , in particular to the node comprising functional block 20, e.g. the MCE.
  • the direct connection information may comprise the feasibility of and/or the quality of the direct connections between the user devices identified as a group in step S41.
  • step S41 is omitted and the user devices 4A-4D each report direct connection information for all devices for which this information is available.
  • step S42 channel quality information with respect to the wireless radio interface of the telecommunications network 1 is transmitted by each of the user devices 4A-4D using functional component 21 as in the embodiment of Figs. 3A and 3B.
  • the direct connection information is transmitted along with the channel quality information, this is not necessary.
  • the information may be transmitted using different signals and the frequency of transmission may also be different.
  • the direct connection information may be transmitted less frequently than the channel quality information.
  • the performance of the method will, however, improve if the telecommunications network 1 has up-to-date information on both the channel qualities and the direct connection qualities.
  • Functional block 20 in the telecommunications network 1 receives the information from each of the user devices 4A, 4C and 4D.
  • the channel quality information comprises CQI reports as known for unicast transmission, wherein the CQI is based on the estimated SINR.
  • the CQI may be based on any, or any combination, of the SINR, RSRP, RSRQ or path loss estimate.
  • step S43 functional block 20 in the telecommunications network assesses the received channel quality information and the direct connection information received from the user devices.
  • functional block 21 deter- mines that user devices 4A, 4C and 4D have a direct connection feasibility and/or have a direct connection quality that is sufficient to form a group G for which the MCS can be set in accordance with the best channel quality of the wireless radio interface for these user devices 4A, 4C and 4D.
  • the channel quality is best for user device 4D (e.g. SINR reported by or derived for user device 4D exceeds SINR reported by or de- rived for user devices 4A and 4C)
  • the MCS is set in accordance with the channel quality (e.g. the SINR) for user device 4D.
  • the telecommunications network 1 performs multicast transmission of the data in accordance with the selected MCS, i.e. in accordance with the MCS selected in accordance with the channel quality determined from the channel quality information reported by user device 4D.
  • the thick arrows in Fig. 4A This is indicated by the thick arrows in Fig. 4A.
  • the lighter greyscale of the arrows indicates a greater likelihood that user devices 4A and 4C, for which a poorer channel quality was determined than for user device 4D, do not appropriately receive all the multicast data since the MCS is not selected in accordance with their channel quality.
  • the user device 4D transmits data parts (e.g. data packets or data segments) that has not been correctly received by user devices 4A, 4C from the telecommunication network's multicast transmission.
  • the user device 4D transmits the data parts over the direct wireless connections, e.g. over D2D links.
  • Functional block 20 in the telecommunications network may decide when to switch from the prior art multicast method of selecting the MCS in accordance with a target SINR (which could be considered to correspond to a target channel quality) to the multicast method of selecting the MCS in accordance with the best channel quality as determined or derived from channel quality information received from a group of devices capable of distributing the multicast data over direct wireless connections within the group.
  • a signal containing an indication of the application of the latter method is transmitted to the user devices.
  • Functional block 21 in the user devices transmits at least one of channel quality information and direct connection information to the telecommunications network 1 in response to receiving the (instruction) signal containing the indication from the telecommunications network 1 .
  • Fig. 5 is a block diagram illustrating an exemplary data processing system 50 that may be used as a device 4A-4D comprising functional block 21 or as a network node containing functional block 20, e.g. an MCE, in the telecommunications network 1.
  • a device 4A-4D comprising functional block 21 or as a network node containing functional block 20, e.g. an MCE, in the telecommunications network 1.
  • Data processing system 50 may include at least one processor 51 coupled to memory elements 52 through a system bus 53. As such, the data processing system 50 may store program code within memory elements 52. Further, processor 51 may execute the program code accessed from memory elements 52 via system bus 53. In one aspect, data processing system 50 may be implemented as a computer that is suitable for storing and/or executing program code. It should be appreciated, however, that data processing system 50 may be implemented in the form of any system including a processor and memory that is capable of performing the functions described within this disclosure.
  • Memory elements 52 may include one or more physical memory devices such as, for ex- ample, local memory 54 and one or more bulk storage devices 55.
  • Local memory 54 may refer to random access memory or other non-persistent memory device(s) generally used during actual execution of the program code.
  • a bulk storage device may be implemented as a hard drive or other persistent data storage device.
  • the data processing system 50 may also include one or more cache memories (not shown) that provide temporary storage of at least some program code in order to reduce the number of times program code must be retrieved from bulk storage device 55 during execution.
  • I/O devices depicted as input device 56 and output device 57 optionally can be coupled to the data processing system 50.
  • input devices may include, but are not limited to, for example, a keyboard, a pointing device such as a mouse, a touchscreen, or the like.
  • output device may include, but are not limited to, for example, a monitor or display, speakers, or the like.
  • Input device 56 and/or output device 57 may be coupled to data processing system 50 either directly or through intervening I/O controllers.
  • a network adapter 58 may also be coupled to data processing system 50 to enable it to become coupled to other systems, computer systems, remote network devices, and/or remote storage devices through intervening private or public networks.
  • the network adapter 58 may comprise a data receiver for receiving data that is transmitted by said systems, devices and/or networks to said data processing system 50 and a data transmitter for transmitting data to said systems, devices and/or networks.
  • Modems, cable modems, and Ethernet cards are examples of different types of network adapters that may be used with data processing system 50.
  • memory elements 52 may store an application 59. It should be ap- preciated that data processing system 50 may further execute an operating system (not shown) that can facilitate execution of the application. Applications, being implemented in the form of executable program code, can be executed by data processing system 50, e.g., by processor 51. Responsive to executing the application 59, the data processing system 50 may be configured to perform one or more operations to be described herein in further detail.
  • data processing system 50 may represent a client data processing system, e.g. within user devices 4A-4D.
  • application 59 may represent a client application that, when executed, configures data processing system 50 to perform the various functions described herein for the device containing functional block 21.
  • client can include, but are not limited to, a personal computer, a portable computer, a mobile phone, or the like.
  • data processing system 50 may represent a network node containing functional block 20, e.g. an MCE or a base station in which case application 59, when executed, may configure data processing system 50 to perform operations as described in the present disclosure.
  • application 59 when executed, may configure data processing system 50 to perform operations as described in the present disclosure.
  • Various embodiments of the invention may be implemented as a program product for use with a computer system or a processor, where the program(s) of the program product define functions of the embodiments (including the methods described herein).
  • the program(s) can be contained on a variety of non-transitory computer-readable storage media (generally referred to as "storage"), where, as used herein, the expression “non-transitory computer readable storage media” comprises all computer-readable media, with the sole exception being a transitory, propagating signal.
  • the program(s) can be contained on a variety of transitory computer-readable storage media.
  • Illustrative computer-readable storage media include, but are not limited to: (i) non-writable storage media (e.g., read-only memory devices within a computer such as CD-ROM disks readable by a CD-ROM drive, ROM chips or any type of solid-state non-volatile semiconductor memory) on which information is permanently stored; and (ii) writable storage media (e.g., flash memory, floppy disks within a diskette drive or hard-disk drive or any type of solid-state random-access semiconductor memory) on which alterable information is stored.
  • non-writable storage media e.g., read-only memory devices within a computer such as CD-ROM disks readable by a CD-ROM drive, ROM chips or any type of solid-state non-volatile semiconductor memory
  • writable storage media e.g., flash memory, floppy disks within a diskette drive or hard-disk drive or any type of solid-state random-access semiconductor memory

Landscapes

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

Abstract

L'invention concerne un procédé et un système de multidiffusion efficaces appliquant des connexions directes sans fil entre des dispositifs d'utilisateur. Le réseau de télécommunication est apte à sélectionner la technique de modulation et de codage optimale pour un groupe de dispositifs d'utilisateur aptes à transmettre des données de multidiffusion sur la connexion directe sans fil conformément à la meilleure qualité de canal rapportée par un dispositif d'utilisateur.
PCT/EP2015/051480 2014-01-27 2015-01-26 Procédé et système de multidiffusion efficaces appliquant des connexions directes de dispositif à dispositif WO2015110630A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP14152616 2014-01-27
EP14152616.0 2014-01-27

Publications (1)

Publication Number Publication Date
WO2015110630A1 true WO2015110630A1 (fr) 2015-07-30

Family

ID=49999797

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2015/051480 WO2015110630A1 (fr) 2014-01-27 2015-01-26 Procédé et système de multidiffusion efficaces appliquant des connexions directes de dispositif à dispositif

Country Status (1)

Country Link
WO (1) WO2015110630A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018202702A1 (fr) * 2017-05-04 2018-11-08 Thales Procede et systeme de distribution dans un reseau mixte point-a-multipoint et point-a-point (d2d)
CN109348513A (zh) * 2018-11-15 2019-02-15 Oppo广东移动通信有限公司 一种数据包传输方法、终端及计算机存储介质

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011156958A1 (fr) * 2010-06-17 2011-12-22 Nokia Corporation Sélection locale de dispositif de retransmission dans un groupe coopératif pour améliorer une multidiffusion cellulaire
WO2012071736A1 (fr) * 2010-12-03 2012-06-07 Nokia Corporation Retransmission d2d intra-grappe avec adaptation de liaison instantanée et nombre adaptif de retransmetteurs

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011156958A1 (fr) * 2010-06-17 2011-12-22 Nokia Corporation Sélection locale de dispositif de retransmission dans un groupe coopératif pour améliorer une multidiffusion cellulaire
WO2012071736A1 (fr) * 2010-12-03 2012-06-07 Nokia Corporation Retransmission d2d intra-grappe avec adaptation de liaison instantanée et nombre adaptif de retransmetteurs

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
ANTONIOS ALEXIOU ET AL: "Modulation and coding scheme selection in multimedia broadcast over a single frequency network-enabled long-term evolution networks", INTERNATIONAL JOURNAL OF COMMUNICATION SYSTEMS, vol. 25, no. 12, 23 August 2011 (2011-08-23), pages 1603 - 1619, XP055128018, ISSN: 1074-5351, DOI: 10.1002/dac.1326 *
FEN HOU ET AL: "Cooperative Multicast Scheduling Scheme for IPTV Service over IEEE 802.16 Networks", IEEE INTERNATIONAL CONFERENCE ON COMMUNICATIONS, 2008 : ICC '08 ; 19 - 23 MAY 2008, BEIJING, CHINA, IEEE, PISCATAWAY, NJ, USA, 19 May 2008 (2008-05-19), pages 2566 - 2570, XP031265807, ISBN: 978-1-4244-2075-9 *
JEAN-MARIE VELLA ET AL: "A Survey of Multicasting over Wireless Access Networks", IEEE COMMUNICATIONS SURVEYS, IEEE, NEW YORK, NY, US, vol. 15, no. 2, 2 May 2013 (2013-05-02), pages 718 - 753, XP011508063, ISSN: 1553-877X, DOI: 10.1109/SURV.2012.050412.00095 *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018202702A1 (fr) * 2017-05-04 2018-11-08 Thales Procede et systeme de distribution dans un reseau mixte point-a-multipoint et point-a-point (d2d)
FR3066065A1 (fr) * 2017-05-04 2018-11-09 Thales Procede et systeme de distribution dans un reseau mixte point-a-multipoint et point-a-point (d2d)
EP3619990B1 (fr) * 2017-05-04 2021-10-27 Thales Procédé et système de distribution dans un réseau mixte point-à-multipoint et point-à-point (d2d)
CN109348513A (zh) * 2018-11-15 2019-02-15 Oppo广东移动通信有限公司 一种数据包传输方法、终端及计算机存储介质
CN109348513B (zh) * 2018-11-15 2023-08-11 Oppo广东移动通信有限公司 一种数据包传输方法、终端及计算机存储介质

Similar Documents

Publication Publication Date Title
US10966061B2 (en) Multicast service transmission method and device
US11051317B2 (en) SC-MCCH sending method and apparatus, and SC-PTM receiving method and apparatus
JP6437451B2 (ja) ロングタームエボリューションマシンタイプ通信のためのチャネル状態情報ならびに適応変調およびコーディング設計
EP2939491B1 (fr) Procédé et dispositf pour la communication directe (device-to-device)
EP2939492B1 (fr) Mesure de signal de référence pour une communication de dispositif à dispositif
US10575291B2 (en) Telecommunications apparatus and methods
US9655138B2 (en) System and method for scheduling wireless transmissions
JP6483151B2 (ja) 様々な無線アクセス技術（ｒａｔ）間でベアラを動的に分割するための技法
JP6193490B2 (ja) Ｌｔｅアップリンクスループット推定のための方法および装置
US20190007891A1 (en) Sc-mcch sending method and device, and sc-ptm receiving method and device
JP2018505613A (ja) ポイントツーマルチポイント送信に関するｕｅのフィードバック
JP2018038047A (ja) Ｌｔｅ（登録商標）におけるスモールセルのための発見基準信号についてのセルｉｄ管理
EP2939359A2 (fr) Procédé et appareil pour une communication de dispositif à dispositif
WO2014153752A1 (fr) Procédé et dispositif d'attribution de largeur de bande, équipement d'utilisateur et station de base
KR20100138812A (ko) 멀티미디어 브로드캐스트/멀티캐스트 서비스에서 오류 패킷의 재전송 요구 정보 전송 방법 및 재전송 요구에 대한 오류 패킷 재전송 방법
US20160105894A1 (en) eMBMS Management Method, Multimedia Broadcast Multicast Service Coordination Entity, and Base Station
KR101343306B1 (ko) 협력 ｍｉｍｏ에서 다운링크 서비스 데이터에 대한 콘텐츠 동기화를 수행하는 방법 및 그 장치
US11115882B2 (en) Data transmission method, apparatus, and system
WO2015110630A1 (fr) Procédé et système de multidiffusion efficaces appliquant des connexions directes de dispositif à dispositif
US20180192357A1 (en) A Method, System and Devices for Enabling a Network Node to Perform a Radio Operation Task in a Telecommunication Network
CN107431940B (zh) 用于在无线通信系统中控制上行链路的覆盖的方法和装置
CN104995932B (zh) 一种无线资源分配的方法及装置
US20240129918A1 (en) Cooperative communication implementation method, device, and storage medium
US20230188271A1 (en) Data communication apparatuses, methods for data communication, communication apparatuses and methods for communication using shared data
WO2010094174A1 (fr) Procédé, appareil et système de communications permettant d'obtenir et d'envoyer des informations de rétroaction de qualité de canal

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: 15702692

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: 15702692

Country of ref document: EP

Kind code of ref document: A1