WO2014201661A1 - 一种组播重传方法、设备及系统 - Google Patents

一种组播重传方法、设备及系统 Download PDF

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Publication number
WO2014201661A1
WO2014201661A1 PCT/CN2013/077562 CN2013077562W WO2014201661A1 WO 2014201661 A1 WO2014201661 A1 WO 2014201661A1 CN 2013077562 W CN2013077562 W CN 2013077562W WO 2014201661 A1 WO2014201661 A1 WO 2014201661A1
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WO
WIPO (PCT)
Prior art keywords
linear combination
user equipment
base station
packets
coefficients
Prior art date
Application number
PCT/CN2013/077562
Other languages
English (en)
French (fr)
Inventor
李龠
朱松
郭小龙
鲁振伟
Original Assignee
华为技术有限公司
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 华为技术有限公司 filed Critical 华为技术有限公司
Priority to PCT/CN2013/077562 priority Critical patent/WO2014201661A1/zh
Priority to CN201480002046.5A priority patent/CN104521170B/zh
Priority to PCT/CN2014/077850 priority patent/WO2014201928A1/zh
Publication of WO2014201661A1 publication Critical patent/WO2014201661A1/zh

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/12Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16Arrangements 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
    • H04L1/18Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1867Arrangements specially adapted for the transmitter end
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00Data switching networks
    • H04L12/02Details
    • H04L12/16Arrangements for providing special services to substations
    • H04L12/18Arrangements for providing special services to substations for broadcast or conference, e.g. multicast
    • H04L12/1863Arrangements for providing special services to substations for broadcast or conference, e.g. multicast comprising mechanisms for improved reliability, e.g. status reports
    • H04L12/1868Measures taken after transmission, e.g. acknowledgments
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L2001/0092Error control systems characterised by the topology of the transmission link
    • H04L2001/0093Point-to-multipoint

Definitions

  • the present invention relates to the field of communications, and in particular, to a multicast retransmission method, device, and system.
  • new services are generating more and more multicast services, such as unified upgrade information for smart meter reading terminals, and regional traffic road broadcast information for vehicle terminals. Or regional advertising push messages.
  • the multicast service generated by the new service is different from the traditional multicast service and requires higher reliability. If the packet transmission error occurs on the air interface, it is necessary to retransmit the transmission error packet, such as sending to multiple meters. If the upgrade fails and the entire upgrade fails, you need to retransmit the upgrade information. When an error occurs in the transmission of the data packet, the base station needs to retransmit the data packet that is not correctly received, thereby causing waste of the retransmission resource.
  • the embodiment of the invention provides a method, a device and a system for retransmitting a multicast.
  • the linear retransformation of the original data uses the same retransmission resource to retransmit all the user equipments that need to be retransmitted, thereby avoiding waste of retransmitted resources.
  • the technical solution of the embodiment of the present invention is to provide a multicast retransmission method, where the method includes: the base station sends m linear combination packets to each user equipment in the user equipment set.
  • Each linear combination packet of the m linear combination packets is a linear combination of n original data packets, and coefficients of any n linear combination packets in the m linear combination packets form a full rank matrix; a natural number greater than or equal to 2, where m is greater than or equal to the n, the user equipment set includes at least two user equipments;
  • the base station Receiving, by the base station, at least one user equipment sent by the user equipment set
  • the feedback information the base station sends a retransmission linear combination packet to each user equipment in the user equipment set, and the coefficients of the retransmission linear combination packet are different from the coefficients of the m linear combination packets, and
  • the coefficients of any n - 1 linear combination packets in the m linear combination packets constitute a full rank matrix.
  • the receiving, by the base station, the feedback information sent by the at least one user equipment in the user equipment set includes: receiving, by the base station, the user equipment concentration on a common feedback channel Feedback information sent by at least one user equipment.
  • the method further includes: sending, by the base station, configuration information of the common feedback channel to each of the user equipment sets by using a system broadcast User equipment.
  • the base station sends, by using the m linear combination coefficients of the linear combination coefficient set, m linear combination packets to each user equipment in the user equipment set according to a preset linear combination coefficient set, where the linear combination coefficient
  • the set of n linear combination coefficients constitutes a full rank matrix; the base station sends a retransmission linear combination packet to each user equipment in the user equipment set, including:
  • the base station sends the retransmission linear combination packet to each user equipment in the user equipment set according to a preset linear combination coefficient set, using the m+1 linear combination coefficients in the linear combination coefficient set in sequence.
  • the preset set of linear combination coefficients is stored in each user equipment in the base station and the user equipment set, or The preset linear combination coefficient set is sent by the base station to each user equipment in the user equipment set by system broadcast.
  • the sequence of the linear combination coefficient of the preset linear combination coefficient is bound to the time or subframe number sequence.
  • another multicast retransmission method includes: receiving, by a first user equipment in a user equipment set, m linear combination packets sent by a base station, and each linear combination of the m linear combination packets
  • the packets are respectively a linear combination of n original data packets, and the coefficients of any n linear combination packets in the m linear combination packets constitute a full rank matrix;
  • the n is a natural number greater than or equal to 2
  • the m is greater than or Equal to the n
  • the user equipment set includes at least two user equipments;
  • the first user equipment sends feedback information to the base station, so that the base station sends the information according to the feedback information.
  • Each user equipment in the user equipment set sends a retransmission linear combination packet, where coefficients of the retransmission linear combination packet are different from coefficients of the m linear combination packets, and any n of the m linear combination packets -
  • the coefficients of one linear combination packet constitute a full rank matrix.
  • the sending the feedback information to the base station includes:
  • Feedback information is sent to the base station on a common feedback channel.
  • the method further includes
  • the first user equipment receives configuration information of the public feedback channel sent by the base station by using a system broadcast.
  • the first user equipment in the user equipment set receives the m linear combination packets sent by the base station to include:
  • the first user equipment in the user equipment set receives m linear combination packets sent by the base station, where the m linear combination packets are set by the base station according to a preset linear combination coefficient,
  • the m linear combination coefficients in the set of linear combination coefficients are sequentially transmitted to each user equipment in the user equipment set, and the n linear combination coefficients in the linear combination coefficient set constitute a full rank matrix.
  • the first user equipment receives a retransmission linear combination packet, where the retransmission linear combination packet is a preset linear combination coefficient of the base station according to the preset And transmitting, in order, using the m+1 linear combination coefficients in the set of linear combination coefficients to each user equipment in the user equipment set.
  • the first user equipment stores the preset linear combination coefficient set in combination with the third possible implementation manner or the fourth possible implementation manner;
  • the first user equipment receives the preset linear combination coefficient set sent by the base station through a system broadcast.
  • the preset linear combination coefficient concentration linear combination coefficient sequence and The time or subframe number is bound in sequence.
  • a base station including:
  • a sending unit configured to send, to each user equipment in the user equipment set, m linear combination packets, where each linear combination packet of the m linear combination packets is a linear combination of n original data packets, the m linear combinations
  • the coefficients of any of the n linear combination packets in the packet constitute a full rank matrix; the n is a natural number greater than or equal to 2, the m is greater than or equal to the n, and the user equipment set includes at least two user equipments;
  • a unit configured to: after the sending unit sends the m linear combination packets, receive feedback information sent by at least one user equipment in the user equipment set; the sending unit is configured to: if the receiving unit receives the And transmitting, by the user equipment, the feedback information sent by the at least one user equipment, and sending, to each user equipment in the user equipment set, a retransmission linear combination packet, where a coefficient of the retransmission linear combination packet and a coefficient of the m linear combination packets are both Not identical, and the coefficients of any
  • the sending unit is further configured to: send, by using a system broadcast, configuration information of the common feedback channel to each user in the user equipment set. device.
  • the sending unit is configured to: use the preset linear combination coefficient set according to a preset And transmitting, by the m linear combination coefficients in the set of linear combination coefficients, m linear combination packets to each user equipment in the user equipment set, where the n linear combination coefficients in the linear combination coefficient set constitute a full rank matrix;
  • the receiving unit receives the feedback information sent by the at least one user equipment, according to the preset linear combination coefficient set, sequentially using the m+1 linear combination coefficients in the linear combination coefficient set to the user equipment
  • Each of the centralized user equipments transmits the retransmission linear combination packet.
  • the base station further includes: a storage unit, configured to store the preset linear combination coefficient set.
  • the sending unit is further configured to send, by using a system broadcast, the preset linear combination coefficient set to The user equipment aggregates each user equipment.
  • the preset linear combination coefficient is in a sequence of linear combination coefficients The time or subframe number is bound in sequence.
  • the user equipment includes:
  • a receiving unit configured to receive m linear combination packets sent by the base station, where each linear combination packet of the m linear combination packets is a linear combination of n original data packets, respectively
  • the coefficients of any n linear combination packets in the m linear combination packets constitute a full rank matrix; the n is a natural number greater than or equal to 2, the m is greater than or equal to the ⁇ , and the confirmation unit is used to confirm the Whether the number of the linear combination packets received by the receiving unit is smaller than the ⁇ ;
  • a sending unit configured to send feedback information to the base station after the confirming unit confirms that the number of the linear combination packets is less than the ⁇ , so that the base station concentrates the user equipment according to the feedback information.
  • the user equipment sends a retransmission linear combination packet, the coefficients of the retransmission linear combination packet are different from the coefficients of the m linear combination packets, and any n-1 linearities in the m linear combination packets
  • the coefficients of the combined packet form a full rank matrix.
  • the sending unit is configured to: send feedback information to the base station on a common feedback channel.
  • the receiving unit is further configured to receive, by using a system broadcast, configuration information of the common feedback channel sent by the base station.
  • the receiving unit is specifically configured to: receive m linear combination packets sent by the base station, where The m linear combination packets are sent by the base station to each user equipment in the user equipment set according to a preset linear combination coefficient set and sequentially using m linear combination coefficients in the linear combination coefficient set, The n linear combination coefficients in the linear combination coefficient set constitute a full rank matrix.
  • the receiving unit is further configured to: receive a retransmission linear combination packet, where the retransmission linear combination packet is a preset linearity of the base station according to a preset
  • the combined coefficient set is sequentially transmitted to each user equipment in the user equipment set using the m+1 linear combination coefficients in the linear combination coefficient set.
  • the user equipment further includes: a storage unit, configured to store the preset linear combination coefficient set.
  • the receiving unit is further configured to: receive the preset linear combination coefficient set sent by the base station by using a system broadcast.
  • the preset linear combination coefficient is in a sequence of linear combination coefficients The time or subframe number is bound in sequence.
  • a fifth aspect a system for multicast retransmission, comprising the base station according to any one of the preceding claims, and at least two user equipments according to any one of the foregoing.
  • the method, device and system for multicast retransmission provided by the embodiment of the present invention after the base station receives the feedback information sent by the user equipment, the base station sends a retransmission linearity to all user equipments by linearly transforming the original data packet. Combining the package, the user equipment can recover the original data packet by solving the linear multivariate one-time equations, thereby improving the retransmission efficiency of the group transmission.
  • the base station needs to retransmit the specific packet, which causes waste of retransmission resources, and the retransmission efficiency of the group transmission is low.
  • FIG. 1 is a schematic diagram of a principle of a multicast retransmission method in the prior art
  • FIG. 2 is a flowchart of a method for multicast retransmission according to an embodiment of the present invention
  • FIG. 3 is a flowchart of another method for multicast retransmission according to an embodiment of the present invention
  • FIG. 5 is a schematic diagram of a linear transformation according to an embodiment of the present invention
  • FIG. 6 is a schematic diagram of a multicast/feedback/retransmission mechanism according to an embodiment of the present invention
  • 7 is a structural diagram of a device of a base station according to an embodiment of the present invention.
  • FIG. 8 is a structural diagram of another apparatus of a base station according to an embodiment of the present disclosure
  • FIG. 9 is a structural diagram of a hardware structure of a base station according to an embodiment of the present invention
  • FIG. 10 is a structural diagram of a device of a user equipment according to an embodiment of the present invention
  • FIG. 1 is another user equipment according to an embodiment of the present invention
  • FIG. 12 is a hardware structural diagram of a user equipment according to an embodiment of the present invention.
  • FIG. 1 is a schematic diagram of a principle of a multicast retransmission method in the prior art. It is assumed that a base station needs to send a packet x1, a packet x2, and a packet x3 to a user equipment (UE) UE1, UE2, and UE3, respectively. , where xl, ⁇ 2, and ⁇ 3 are the other three data packets. After the base station multicasts the packet xl, if the user equipment confirms that the UE3 has lost the packet, the UE3 feedback packet xl receives the error or is lost, and the base station retransmits once for the UE3. Packet xl; The base station transmits the second packet x2.
  • UE user equipment
  • the embodiment of the present invention does not limit the retransmission time, but has a better implementation effect on a stable multicast service, for example, unified upgrade information for a smart meter reading terminal, regional traffic road condition broadcast information of an in-vehicle terminal, or regional advertisement push.
  • unified upgrade information for a smart meter reading terminal for example, unified upgrade information for a smart meter reading terminal, regional traffic road condition broadcast information of an in-vehicle terminal, or regional advertisement push.
  • the method provided by the embodiments of the present invention can be applied to various communication systems, for example, a Global System of Mobile communication (GSM) network, a General Packet Radio Service (GPRS) network, Wideband Code Division Multiple Access (Wideband Code Division Multiple) Access, referred to as WCDMA network, CDMA-2000 network, Time Division-Synchronous Code Division Multiple Access (TD-SCDMA) network or Worldwide Interoperability for Microwave Access WiMAX (abbreviation) network Wait.
  • GSM Global System of Mobile communication
  • GPRS General Packet Radio Service
  • WCDMA Wideband Code Division Multiple Access
  • CDMA-2000 Code Division-2000
  • TD-SCDMA Time Division-Synchronous Code Division Multiple Access
  • WIMAX Worldwide Interoperability for Microwave Access WiMAX
  • the SAE/LTE network may include a radio access network node (such as an eNodeB), a core network node (such as a mobility management entity MME: Mobility Management Entity), a serving gateway (S-GW: Server Gateway), and a packet data gateway ( P-GW: Packet Data Network Gateway).
  • the radio access network node is configured to provide an air interface to the user equipment, so that the user equipment accesses the SAE/LTE network.
  • the core network node is a control plane entity, which is responsible for the core network control function of the SAE/LTE network, and performs mobility management and session management of the user equipment.
  • the serving gateway and the packet data gateway may be user plane entities for providing data transmission services to user equipment.
  • the embodiment of the present invention provides a method for multicast retransmission, which is shown in FIG. 2, and includes:
  • the base station sends, to each user equipment in the user equipment set, m linear combination packets, where each linear combination packet of the m linear combination packets is a linear combination of n original data packets, where the m linear combination packets are included.
  • the coefficients of any of the n linear combination packets constitute a full rank matrix; the n is a natural number greater than or equal to 2, the m is greater than or equal to the n, and the user equipment set includes at least two user equipments;
  • the set of user equipment is composed of user equipments that need to receive multicast services in the coverage of the base station, where the user equipment set includes at least two user equipments, but how many user equipments are specifically included in the user equipment set, because the purpose of the present invention is The implementation does not have an impact.
  • the user equipment set may include all user equipments in the coverage of the base station that need to receive multicast services.
  • the base station If the base station receives the feedback information sent by the at least one user equipment in the user equipment set, the base station sends the information to each user equipment in the user equipment set. Transmitting a linear combination packet, the coefficients of the retransmission linear combination packet are different from the coefficients of the m linear combination packets, and any n-1 linear combination packets of the m linear combination packets are The coefficients form a full rank matrix.
  • the feedback information sent by different user equipments may include the same content, and is used to indicate that the base station "the coefficients of the linear combination packet received by the UE cannot form the full rank matrix and then the original data packet, and the new data packet needs to be added.
  • Linear combination package For example, the feedback information may be Negative Acknowledgement (NACK) information.
  • NACK Negative Acknowledgement
  • a multicast retransmission method is provided by the embodiment of the present invention.
  • the base station After the base station receives the feedback information sent by the user equipment, the base station sends a retransmission linear combination packet to all user equipments by using the linear transformation of the original data packet.
  • the original data packet can be recovered by solving the linear multivariate one-time equations, thereby improving the retransmission efficiency of the group transmission.
  • the base station needs to retransmit the specific packet, which causes waste of retransmission resources, and the retransmission efficiency of the group transmission is low.
  • the receiving, by the base station, the feedback information sent by the at least one user equipment in the user equipment set may include:
  • the base station receives feedback information sent by at least one user equipment in the user equipment set on a common feedback channel.
  • the method may further include: the base station transmitting, by using a system broadcast, configuration information of the common feedback channel to each user equipment in the user equipment set.
  • the sending, by the base station, the m linear combination packets to each user equipment in the user equipment set may include: the base station sequentially using the linear combination coefficient set according to the preset linear combination coefficient set.
  • the linear combination coefficient sends m linear combination packets to each user equipment, and the n linear combination coefficients in the linear combination coefficient set constitute a full rank matrix;
  • the base station sends a retransmission linear combination to each user equipment in the user equipment set Package, package
  • the base station sends the retransmission linear combination packet to each user equipment in the user equipment set according to a preset linear combination coefficient set, using the m+1 linear combination coefficients in the linear combination coefficient set in sequence.
  • the preset linear combination coefficient set includes a plurality of linear combination coefficients.
  • the total number of linear combination coefficients included in the preset linear combination coefficient set is called T, and the T should be greater than or Equal to m + 1 , preferably, T is much larger than m, thereby ensuring that the linear combination coefficients used are not repeated in the possible number of retransmissions.
  • T can be determined according to factors such as the spatial size of the linear operation Galois field.
  • any n linear combination coefficients in the linear combination coefficient set constitute a full rank matrix, that is: any n from the T vectors (the number of original data packets in the linear combination packet) can form an n-th order full Rank matrix.
  • the user equipment receiving the n linear combined data packets can be inferred by the n-th order full rank matrix to obtain n original data packets.
  • the base station uses the "preset" linear combination coefficient set in "sequence" to synchronize the base station and the user equipment on the coefficients.
  • the base station first sends m linear combination packets.
  • a certain packet loss rate may be considered in advance, so that m>n, if the UE still receives With less than n linear combination packets, the UE sends feedback information to the base station, for example, feedback NACK, and the base station receives the feedback information, and does not need to know which packet of which UE is out of error, and only needs to transmit to each UE in the user equipment set.
  • the m+ 1 linear combination package (retransmission linear combination package), this m+ 1 linear combination package is also the "sequence" linear combination coefficient set using "preset” because the m+ 1 linear combination package and the previous m linear
  • the combined packets use different coefficients, so that the UE receiving less than n linear combined packets can combine the new m+1 linear combination packets with the previously received linear combination packets, if it can form n-th order full
  • the rank matrix can be inferred by the n-th order full rank matrix to obtain n original data packets.
  • the method further includes: the base station storing the preset linear combination coefficient set; or
  • the base station does not receive any feedback information sent by the user equipment, the base station does not send a retransmission linear combination packet to each user equipment in the user equipment set.
  • the embodiment of the present invention provides another method for multicast retransmission.
  • the method includes:
  • the first user equipment in the user equipment set receives m linear combination packets sent by the base station, where each linear combination packet of the m linear combination packets is a linear combination of n original data packets, and the m linear combinations
  • the coefficients of any n linear combination packets in the packet constitute a full rank matrix; the n is a natural number greater than or equal to 2, and the m is greater than or equal to the n;
  • the feedback information sent by different user equipments may include the same content, and is used to indicate that the base station "the coefficients of the linear combination packet received by the UE cannot form the full rank matrix and then the original data packet, and the new data packet needs to be added.
  • Linear combination package
  • the feedback information can be NACK:.
  • the method for multicast retransmission provided by the embodiment of the present invention, by linearly transforming the original data packet, when the number of linear combination packets received by the user equipment is smaller than the number of original data packets, sending feedback information to the base station
  • the base station sends the retransmission linear combination packet to all user equipments, and the user equipment can recover the original data packet by solving the linear multiple equations, thereby improving the retransmission efficiency of the group transmission.
  • the base station needs to retransmit the specific packet, which causes waste of retransmission resources, and the retransmission efficiency of the group transmission is low.
  • the sending the feedback information to the base station includes: Feedback information is sent to the base station on a common feedback channel.
  • the method further includes: receiving, by the first user equipment, configuration information of the common feedback channel sent by the base station by using a system broadcast. Further, the first user equipment in the user equipment set receives the m linear combination packets sent by the base station, and the first user equipment in the user equipment set receives the m linear combination packets sent by the base station, where the m linear The combined packet is sent by the base station to each user equipment in the user equipment set according to a preset linear combination coefficient set and sequentially using m linear combination coefficients in the linear combination coefficient set, where the linear combination coefficient is concentrated. The n linear combination coefficients constitute a full rank matrix.
  • the method further includes: the first user equipment receives a retransmission linear combination packet, where the retransmission linear combination packet is used by the base station according to a preset linear combination coefficient set, and the linear combination coefficient is used in sequence The m+th linear combination coefficient of the set is transmitted to each user equipment in the user equipment set.
  • the method further includes: the first user equipment storing the preset linear combination coefficient set; or: the first user equipment receiving the preset linear combination sent by the base station by using a system broadcast Set of coefficients.
  • the order of the linear combination coefficients of the preset line '1' and the combination coefficient is sequentially bound to the time or the subframe number.
  • the feedback information is not sent to the base station.
  • the base station sends, to each user equipment in the user equipment set, m linear combination packets, where each linear combination packet of the m linear combination packets is a line of n original data packets. a combination of the coefficients of any n linear combination packets of the m linear combination packets to form a full rank matrix; the n is a natural number greater than or equal to 2, the m is greater than or equal to the n;
  • the UE can continuously multicast multiple data, and the UE uniformly feeds back the feedback mechanism. For example, after the base station can continuously multicast n original data packets, the UE re-feeds the feedback, where n can be greater than or A natural number equal to 2, the base station sends m linear combination packets (m is greater than or equal to n) to the UE, the m linear combination packets are linear combinations of n original data packets, and the UE calculates n according to the received linear combination packet.
  • the m linear combined packets sent by the base station need to satisfy: the coefficients of any n linear combined packets in the m linear combined packets constitute a full rank matrix.
  • the base station linearly transforms the original data packets xl, x2, and x3 to obtain different linear combination packages, each of which is a linear combination of the original data packets xl, x2, and x3.
  • FIG. 5 is a schematic diagram of linear transformation of original data packets xl, x2, and x3, the original data packets xl, x2, and x3 are linearly transformed by linear coefficients pl, p2, and p3, respectively, to generate three linear combination packets c1, c2. And c3. among them,
  • the number of linear combination packets sent by the base station should be greater than or equal to 3, and the coefficients of any three linear combination packets in the m linear combination packets sent by the base station constitute Full rank matrix.
  • the UE cannot recover n original data packets by solving the equation, and the UE sends feedback information to the base station, so that the base station performs retransmission, for example, when n If the number of linear combination packets received by the UE is 2, the UE cannot recover 3 original data packets by solving the equation, and the UE sends feedback information to the base station. For example, the UE feeds back the NACK to the base station, because it is not necessary to indicate that Which UE receives the error or drops the packet, and the feedback information does not include the identification information of the UE.
  • the multiple UEs may send feedback information to the base station on the common feedback channel to save feedback resources.
  • the configuration information of the common feedback channel can be sent by the base station to each UE through system broadcast.
  • UE3 may send feedback information to the base station on the common feedback channel, and UE3 and UE1
  • the feedback information does not include the identification information of UE3 and UE1, and the feedback mechanism is optimized.
  • the UE may arbitrarily select n out of the received linear data packets and recover n original data packets by solving the equation.
  • the base station sends, according to the feedback information, a retransmission linear combination packet to each user equipment in the user equipment set, and the coefficients of the retransmission linear combination packet are different from the coefficients of the m linear combination packets, and are linearly combined with the m linear combination packets.
  • the coefficients of any n-1 linear combination packets in the packet constitute a full rank matrix. Exemplarily, if the base station receives any feedback information sent by the UE, the base station does not need to know which UE receives the linear combination packet error, and only needs to send a retransmission linear combination packet to all UEs, and the retransmission is performed.
  • the coefficients of the linear combination packet are different from the coefficients of the m linear combination packets previously transmitted, and the coefficients of any n-1 linear combination packets in the previously transmitted m linear combination packets constitute a full rank matrix. For example, if UE3 receives an error in c1, UE1 receives an error at c2, and UE1, UE2, and UE3 both correctly receive c3.
  • the base station receives feedback information sent by UE3 and UE1 on the common feedback channel, and the base station only needs to Sending a linear data packet c4 that is different from the three linear data packets cl, c2, and c3 previously transmitted, and the c4 needs to form a full rank matrix with any two of the previously transmitted cl, c2, and c3, so that The UE can recover xl, x2, and x3 according to the c4 solution ternary equations.
  • the transmission/feedback/retransmission mechanism of the group transmission provided by the embodiment of the present invention may be as shown in FIG. 6. Further, if the base station does not receive any feedback information sent by the user equipment, the base station does not send the retransmission linear combination packet to each user equipment.
  • the base station does not receive any feedback information sent by the UE, it indicates that each UE completes the reception of the data packet, and the base station does not send the retransmission linear combination packet by the UE.
  • the base station may be based on actual conditions. It is no longer necessary to send a retransmission linear combination package.
  • an embodiment of the present invention provides a preferred embodiment.
  • the base station may, according to the preset linear combination coefficient set, use the m linear combination coefficients of the line 'f-combination coefficient set to send m linear combination packets to each user equipment in the user equipment set, and the linear combination coefficient set is arbitrary.
  • n linear combination coefficients constitute a full rank matrix; for example, the linear combination coefficient set may be P,
  • the retransmission linear combination packet is sent to each user equipment by using the m+1th linear combination coefficient in sequence according to the preset line 'fi combination coefficient set P.
  • the preset linear combination coefficient set P may be stored in the base station and each UE, or may be sent by the base station to each UE through system broadcast.
  • the order of the linear combination coefficients in the preset linear combination coefficient set P may be bound to the time or subframe number order to conveniently determine that the first time the base station sends the line '1', the combination packet is linear. Which element of the combination of the coefficient sets P.
  • a method for multicast retransmission provided by the embodiment of the present invention, by linearly transforming the original data packet, after the base station receives the feedback information sent by the user equipment, the base station sends all the user equipments
  • the retransmission linear combination packet is sent, and the user equipment can recover the original data packet by solving the linear ternary one-time equation group, thereby improving the retransmission efficiency of the group transmission.
  • the base station is The specific packet needs to be retransmitted, resulting in waste of retransmission resources, and low retransmission efficiency of group transmission.
  • the base station multicasts data to 100 UEs, and multicasts 100 packets in total, then UE 1 receives the first packet error, and UE2 receives the second packet error. The UE 100 receives the 100th packet error.
  • the UE 100 needs to send feedback information to the base station, and each UE needs to use dedicated feedback resource feedback, so at least 100 feedback resources are consumed, and then the base station needs to separately send the UE 1 to the UE 100 according to the feedback information of the UE 1 to the UE 100. Retransmitting each UE to receive the wrong packet is equivalent to resending each packet once and occupying 100 retransmission resources.
  • an embodiment of the present invention provides a base station 70.
  • the base station 70 includes:
  • the sending unit 701 is configured to send, to each user equipment in the user equipment set, m linear combination packets, where each linear combination packet in the m linear combination packets is respectively n original a linear combination of data packets, the coefficients of any of the n linear combination packets of the m linear combination packets constitute a full rank matrix; the n is a natural number greater than or equal to 2, and the m is greater than or equal to the n,
  • the set of user equipment includes at least two user equipments;
  • the receiving unit 702 is configured to: after the sending unit sends the m linear combination packets, receive feedback information sent by the at least one user equipment in the user equipment set; the sending unit 701 is configured to: if the receiving unit 702 Receiving feedback information sent by the at least one user equipment in the user equipment set, and transmitting a retransmission linear combination packet to each user equipment in the user equipment set, where the coefficients of the retransmission linear combination packet are linearly combined with the m
  • the coefficients of the packets are all different, and the coefficients of any n-1 linear combination packets in the m linear combination packets constitute a full rank matrix.
  • the base station 70 After the base station 70 receives the feedback information sent by the user equipment, the base station 70 sends a retransmission linear combination packet to all user equipments, and the user equipment can pass the linear transformation of the original data packet.
  • the linear multivariate one-time equations are solved, and the original data packet is recovered, thereby improving the retransmission efficiency of the group transmission.
  • the base station In the prior art, no matter which packet is wrong in the prior art, the base station needs to retransmit the specific packet, which causes waste of retransmission resources, and the retransmission efficiency of the group transmission is low.
  • the receiving unit 702 is specifically configured to: receive feedback information sent by at least one user equipment in the user equipment set on a common feedback channel.
  • the sending unit 701 is further configured to: send, by using a system broadcast, configuration information of the public feedback channel to each user equipment in the user equipment set.
  • the sending unit 701 is specifically configured to: send m linearities to each user equipment in the user equipment set by using m linear combination coefficients in the linear combination coefficient set in sequence according to a preset linear combination coefficient set. Combining the packets, the n linear combination coefficients in the linear combination coefficient set constitute a full rank matrix; and when the receiving unit 702 receives the feedback information sent by the at least one user equipment, according to the preset linear combination coefficient set, according to The retransmission linear combination packet is transmitted to each user equipment in the user equipment set in sequence using the m+1 linear combination coefficients in the linear combination coefficient set.
  • the base station 70 further includes:
  • the storage unit 703 is configured to store the preset linear combination coefficient set. Further, the sending unit 701 is further configured to send, by using a system broadcast, the preset linear combination coefficient set to each user equipment in the user equipment set.
  • the order of the linear combination coefficients of the preset linear combination coefficient is bound to the time or subframe number sequence.
  • an embodiment of the present invention provides another base station 70.
  • the base station 70 includes:
  • the transmitter 901 is configured to send, to each user equipment in the user equipment set, m linear combination packets, where each linear combination packet of the m linear combination packets is a linear combination of n original data packets, the m linearities
  • the coefficient of any n linear combination packets in the combined packet constitutes a full rank matrix; the n is a natural number greater than or equal to 2, the m is greater than or equal to the n, and the user equipment set includes at least two user equipments;
  • the receiver 902 is configured to: after the sending, by the transmitter 901, the m linear combination packets, receive feedback information sent by at least one user equipment in the user equipment set; the transmitter 901 is configured to: if the receiving unit The 702 receives the feedback information sent by the at least one user equipment in the user equipment set, and sends a retransmission linear combination packet to each user equipment in the user equipment set, where the coefficients of the retransmission linear combination packet and the m linearities are The coefficients of the combined packets are all different, and the coefficients of any n-1 linear combination packets in the m linear combination packets constitute a full rank matrix.
  • the base station 70 After the base station 70 receives the feedback information sent by the user equipment, the base station 70 sends a retransmission linear combination packet to all user equipments, and the user equipment can pass the linear transformation of the original data packet.
  • the linear multivariate one-time equations are solved, and the original data packet is recovered, thereby improving the retransmission efficiency of the group transmission.
  • the base station In the prior art, no matter which packet is wrong in the prior art, the base station needs to retransmit the specific packet, which causes waste of retransmission resources, and the retransmission efficiency of the group transmission is low.
  • the receiver 902 is specifically configured to receive, on a common feedback channel, feedback information sent by at least one user equipment in the user equipment set.
  • the transmitter 901 is further configured to: send, by using a system broadcast, configuration information of the common feedback channel to each user equipment in the user equipment set.
  • the transmitter 901 is specifically configured to: send, according to a preset linear combination coefficient set, m linear combination coefficients in the linear combination coefficient set to each user equipment in the user equipment set to send m linearities in sequence Combining the packets, the n linear combination coefficients in the linear combination coefficient set constitute a full rank matrix; and when the receiver 902 receives the feedback information sent by the at least one user equipment, according to the preset linear combination coefficient set, press
  • the retransmission linear combination packet is transmitted to each user equipment in the user equipment set in sequence using the m+1 linear combination coefficients in the linear combination coefficient set.
  • the base station 70 further includes: a memory 903, configured to store the preset linear combination coefficient set.
  • the transmitter 901 is further configured to send, by using a system broadcast, the preset linear combination coefficient set to each user equipment in the user equipment set.
  • the order of the linear combination coefficients of the preset line '1' and the combination coefficient is sequentially bound to the time or the subframe number.
  • the embodiment of the present invention provides a user equipment 100, where the user equipment belongs to a user equipment set, and the user equipment set includes at least two user equipments.
  • the user equipment 100 includes:
  • the receiving unit 1001 is configured to receive, by the base station, the m linear combination packets, where each of the m linear combination packets is a linear combination of n original data packets, where any of the m linear combination packets
  • the coefficients of the n linear combination packets constitute a full rank matrix; the n is a natural number greater than or equal to 2, and the m is greater than or equal to the n;
  • the determining unit 1002 is configured to confirm whether the number of the linear combination packets received by the receiving unit is less than the n;
  • the sending unit 1003 is configured to: after the confirming unit confirms that the number of the linear combined packets is less than the n, send feedback information to the base station, so that the base station sends the user information to the user according to the feedback information.
  • Each user equipment in the device set sends a retransmission linear combination packet, where the coefficients of the retransmission linear combination packet are different from the coefficients of the m linear combination packets, and any n- of the m linear combination packets
  • the coefficients of one linear combination packet constitute a full rank matrix.
  • the linear combination package, the user equipment 100 can recover the original data packet by solving the linear multiple equations, thereby improving the retransmission efficiency of the group transmission.
  • the base station needs to retransmit the specific packet, which causes waste of retransmission resources, and the retransmission efficiency of the group transmission is low.
  • the sending unit 1003 is specifically configured to: send feedback information to the base station on a common feedback channel.
  • the receiving unit 1001 is further configured to receive, by using a system broadcast, configuration information of the common feedback channel sent by the base station.
  • the receiving unit 1001 is specifically configured to: receive, by the base station, the m linear combination packets, where the m linear combination packets are used by the base station according to a preset linear combination coefficient set, and use the linear combination coefficient in sequence
  • the concentrated m linear combination coefficients are sent to each user equipment in the user equipment set, and the n linear combination coefficients in the linear combination coefficient set constitute a full rank matrix.
  • the receiving unit 1001 is further configured to: receive a retransmission linear combination packet, where the retransmission linear combination packet is used by the base station according to a preset linear combination coefficient set, and sequentially use the linear combination coefficient set m + 1 linear combination coefficient is transmitted to each user equipment in the user equipment set.
  • the user equipment 100 further includes: a storage unit 1004, configured to store the preset linear combination coefficient set.
  • the receiving unit 1001 is further configured to: receive the preset linear combination coefficient set sent by the base station by using a system broadcast.
  • the order of the linear combination coefficients of the preset linear combination coefficient is bound to the time or subframe number sequence.
  • the embodiment of the present invention provides another user equipment 100, which belongs to a user equipment set, and the user equipment set includes at least two user equipments.
  • the user Device 100 includes:
  • the receiver 1201 is configured to receive, by the base station, the m linear combination packets, where each of the m linear combination packets is a linear combination of n original data packets, and any of the m linear combination packets
  • the coefficients of the n linear combination packets constitute a full rank matrix; the n is a natural number greater than or equal to 2, and the m is greater than or equal to the n;
  • the processor 1202 is configured to confirm whether the number of the linear combination packets received by the receiver is less than the n;
  • the transmitter 1203 is configured to: after the processor confirms that the number of the linear combination packets is less than the n, send feedback information to the base station, so that the base station concentrates the user equipment according to the feedback information.
  • Each user equipment sends a retransmission linear combination packet, where coefficients of the retransmission linear combination packet are different from coefficients of the m linear combination packets, and any n-1 of the m linear combination packets are The coefficients of the linear combination packet constitute a full rank matrix.
  • the user equipment 100 receives less than the number of original data packets, the user equipment 100 sends feedback information to the base station, so that the base station sends a retransmission to all user equipments 100.
  • the linear combination package, the user equipment 100 can recover the original data packet by solving the linear multiple equations, thereby improving the retransmission efficiency of the group transmission.
  • the base station needs to retransmit the specific packet, which causes waste of retransmission resources, and the retransmission efficiency of the group transmission is low.
  • the transmitter 1203 is specifically configured to: send feedback information to the base station on a common feedback channel.
  • the receiver 1201 is further configured to receive, by using a system broadcast, configuration information of the common feedback channel sent by the base station.
  • the receiver 1201 is specifically configured to: receive m linear combined packets sent by the base station, where the m linear combined packets are used by the base station according to a preset linear combination coefficient set, and use the linear combination in sequence
  • the m linear combination coefficients in the coefficient set are sent to each user equipment in the user equipment set, and the n linear combination coefficients in the linear combination coefficient set constitute a full rank matrix.
  • the receiver 1201 is further configured to: receive a retransmission linear combination packet, where The retransmission linear combination packet is sent by the base station to each user equipment 100 in the user equipment set according to a preset linear combination coefficient set, using the m+1 linear combination coefficients in the linear combination coefficient set in order.
  • the user equipment 100 further includes: a memory 1204, configured to store the preset linear combination coefficient set.
  • the receiver 1201 is further configured to receive the preset linear combination coefficient set sent by the base station by using a system broadcast.
  • the order of the linear combination coefficients of the preset line '1' and the combination coefficient is sequentially bound to the time or the subframe number.
  • the embodiment of the present invention provides a system for multicast retransmission, including the base station according to any one of the foregoing embodiments, and at least the user equipment according to any one of the foregoing embodiments.
  • a user equipment is provided by the embodiment of the present invention.
  • the base station sends a linear combination packet to the user equipment by linearly combining the original data packets.
  • Sending feedback information to the base station so that the base station sends a retransmission linear combination packet to all user equipments, and the user equipment can recover the original data packet by solving the linear multiple equations, thereby improving the retransmission efficiency of the group transmission.
  • the base station needs to retransmit the specific packet, which causes waste of retransmission resources, and the retransmission efficiency of the group transmission is low.
  • the disclosed system, apparatus, and method may be implemented in other manners.
  • the device embodiments described above are merely illustrative.
  • the division of the unit is only a logical function division.
  • there may be another division manner for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored, or not executed.
  • the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, It can be electrical, mechanical or other form.
  • the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.
  • each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may be physically included separately, or two or more units may be integrated into one unit.
  • the above integrated unit can be implemented in the form of hardware or in the form of hardware plus software functional units.
  • the above-described integrated unit implemented in the form of a software functional unit can be stored in a computer readable storage medium.
  • the software functional unit described above is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, server, or network device, etc.) to perform portions of the steps of the various embodiments of the present invention.
  • the foregoing storage medium includes: a U disk, a mobile hard disk, a read only memory
  • ROM Read-Only Memory
  • RAM Random Access Memory
  • disk or optical disk etc., which can store program code.

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Abstract

本发明实施例公开了一种组播重传的方法、设备及系统。本发明涉及通信领域,提升了重传效率。本发明实施例的方法包括:基站向用户设备集中每个用户设备发送m个线性组合包,m个线性组合包中每个线性组合包分别为n个原始数据包的线性组合,m个线性组合包中的任意n个线性组合包的系数构成满秩矩阵;n为大于或等于2的自然数,m大于或等于所述n,用户设备集包括至少两个用户设备;若基站接收到用户设备集中至少一个用户设备发送的反馈信息,基站向用户设备集中的每个用户设备发送重传线性组合包,重传线性组合包的系数与m个线性组合包的系数均不相同,且与m个线性组合包中的任意n-1个线性组合包的系数构成满秩矩阵。

Description

一种组播重传方法、 设备及系统 技术领域 本发明涉及通信领域, 尤其涉及一种组播重传方法、 设备及系 统。
背景技术
随着移动通信的发展以及移动互联网、 物联网等新业务的应 用, 新业务产生愈来越多的组播业务, 例如针对智能抄表终端的统 一升级信息, 车载终端的区域交通路况广播信息, 或者区域广告推 送消息。
但是新业务所产生的组播业务和传统的组播业务不同, 需要更 高的可靠性, 如果在空口上数据包传输错误, 是需要重传传输错误 的数据包, 比如给多个电表发送的升级信息, 丟包导致整个升级失 败, 则需要重传升级信息。 当数据包传输发生错误, 基站需要重传未正确接收的数据包, 从而造成重传资源的浪费。 发明内容
本发明实施例提供一种组播重传的方法、 设备及系统, 通过对 原始数据的线性变换, 利用同一重传资源对所有需要重传的用户设 备进行重传, 避免重传资源的浪费。
为达到上述目 的, 本发明实施例釆用的技术方案是, 第一方面, 提供了一种组播重传方法, 所述方法包括: 基站向用户设备集中每个用户设备发送 m个线性组合包, 所述 m个线性组合包中每个线性组合包分别为 n个原始数据包的线性组 合, 所述 m个线性组合包中的任意 n个线性组合包的系数构成满秩 矩阵; 所述 n为大于或等于 2的自然数, 所述 m大于或等于所述 n , 所述用户设备集包括至少两个用户设备;
若所述基站接收到所述用户设备集中至少一个用户设备发送 的反馈信息, 所述基站向所述用户设备集中的每个用户设备发送重 传线性组合包, 所述重传线性组合包的系数与所述 m个线性组合包 的系数均不相同, 且与所述 m个线性组合包中的任意 n - 1个线性组 合包的系数构成满秩矩阵。
在第一种可能的实现方式中, 根据第一方面, 所述基站接收到 所述用户设备集中至少一个用户设备发送的反馈信息包括, 所述基站在公共反馈信道上接收到所述用户设备集中至少一 个用户设备发送的反馈信息。
在第二种可能的实现方式中, 结合第一种可能的实现方式, 所 述方法还包括: 所述基站通过系统广播将所述公共反馈信道的配置信息发送 给所述用户设备集中的每个用户设备。
在第三种可能的实现方式中, 结合第一方面或者第一种可能实 现的方式或者第二种可能的实现方式,
所述基站向所述用户设备集中每个用户设备发送 m个线性组合 包, 包括:
所述基站根据预设的线性组合系数集, 按顺序使用所述线性组 合系数集中的 m个线性组合系数向所述用户设备集中的每个用户设 备发送 m个线性组合包, 所述线性组合系数集中的 n个线性组合系 数构成满秩矩阵; 所述基站向所述用户设备集中每个用户设备发送重传线性组 合包, 包括:
所述基站根据预设的线性组合系数集, 按顺序使用所述线性组 合系数集中的第 m+ 1个线性组合系数向所述用户设备集中每个用户 设备发送所述重传线性组合包。
在第四种可能的实现方式中, 结合第三种可能的实现方式, 所述预设的线性组合系数集存储于所述基站和所述用户设备 集中每个用户设备中, 或者, 所述预设的线性组合系数集由所述基站通过系统广播发送给 所述用户设备集中每个用户设备。
在第五种可能的实现方式中, 结合第四种可能的实现方式, 所述预设的线性组合系数集中线性组合系数的顺序与时间或 子帧号顺序绑定。
第二方面, 提供了另一种组播重传方法, 所述方法包括: 用户 设备集中的第一用户设备接收基站发送的 m个线性组合包, 所述 m 个线性组合包中每个线性组合包分别为 n 个原始数据包的线性组 合, 所述 m个线性组合包中的任意 n个线性组合包的系数构成满秩 矩阵; 所述 n为大于或等于 2的自然数, 所述 m大于或等于所述 n , 所述用户设备集包括至少两个用户设备;
若所述第一用户设备收到的所述线性组合包的个数小于所述 n , 所述第一用户设备向所述基站发送反馈信息, 以使得所述基站 根据所述反馈信息向所述用户设备集中每个用户设备发送重传线 性组合包, 所述重传线性组合包的系数与所述 m个线性组合包的系 数均不相同, 且与所述 m个线性组合包中的任意 n- 1个线性组合包 的系数构成满秩矩阵。
在第一种可能的实现方式中, 根据第二方面, 所述向所述基站 发送反馈信息包括:
在公共反馈信道上向所述基站发送反馈信息。
在第二种可能的实现方式中, 结合第一种可能的实现方式, 所 述方法还包括,
所述第一用户设备通过系统广播接收所述基站发送的所述公 共反馈信道的配置信息。
在第三种可能的实现方式中, 结合第二种可能的实现方式, 所 述用户设备集中的第一用户设备接收基站向发送的 m个线性组合包 包括:
所述用户设备集中的第一用户设备接收基站发送的 m个线性组 合包,所述 m个线性组合包由所述基站根据预设的线性组合系数集、 按顺序使用所述线性组合系数集中的 m个线性组合系数向所述用户 设备集中的每个用户设备发送, 所述线性组合系数集中的 n个线性 组合系数构成满秩矩阵。
在第四种可能的实现方式中, 结合第三种可能的实现方式, 所 述第一用户设备接收重传线性组合包, 所述重传线性组合包为所述 基站根据预设的线性组合系数集, 按顺序使用所述线性组合系数集 中的第 m+ 1个线性组合系数向所述用户设备集中的每个用户设备发 送。
在第五种可能的实现方式中, 结合第三种可能的实现方式或者 第四种可能实现的方式, 所述第一用户设备存储所述预设的线性组 合系数集; 或者,
所述第一用户设备接收所述基站通过系统广播发送的所述预 设的线性组合系数集。 在第六种可能的实现方式中, 结合第三种可能的实现方式或者 第四种可能实现的方式或者第五种可能实现的方式, 所述预设的线 性组合系数集中线性组合系数的顺序与时间或子帧号顺序绑定。
第三方面, 提供了一种基站, 包括:
发送单元, 用于向用户设备集中每个用户设备发送 m个线性组 合包, 所述 m个线性组合包中每个线性组合包分别为 n个原始数据 包的线性组合, 所述 m个线性组合包中的任意 n个线性组合包的系 数构成满秩矩阵; 所述 n为大于或等于 2 的自然数, 所述 m大于或 等于所述 n , 所述用户设备集包括至少两个用户设备; 接收单元, 用于在所述发送单元发送所述 m个线性组合包后, 接收所述用户设备集中至少一个用户设备发送的反馈信息; 所述发送单元用于, 若所述接收单元接收到所述用户设备集中 至少一个用户设备发送的反馈信息, 向所述用户设备集中的每个用 户设备发送重传线性组合包, 所述重传线性组合包的系数与所述 m 个线性组合包的系数均不相同, 且与所述 m个线性组合包中的任意 n- 1个线性组合包的系数构成满秩矩阵。 在第一种可能的实现方式中, 根据第三方面, 所述接收单元具 体用于, 在公共反馈信道上接收到所述用户设备集中至少一个用户 设备发送的反馈信息。
在第二种可能的实现方式中, 结合第二种可能的实现方式, 所 述发送单元还用于, 通过系统广播将所述公共反馈信道的配置信息 发送给所述用户设备集中的每个用户设备。
在第三种可能的实现方式中, 结合第三方面或第一种可能的实 现方式或第二种可能的实现方式, 所述发送单元用于: 根据预设的线性组合系数集, 按顺序使用 所述线性组合系数集中的 m个线性组合系数向所述用户设备集中的 每个用户设备发送 m个线性组合包, 所述线性组合系数集中的 n个 线性组合系数构成满秩矩阵;
以及当所述接收单元接收到至少一个用户设备发送的反馈信 息, 根据所述预设的线性组合系数集, 按顺序使用所述线性组合系 数集中的第 m+ 1个线性组合系数向所述用户设备集中的每个用户设 备发送所述重传线性组合包。
在第四种可能的实现方式中, 结合第三种可能的实现方式, 所 述基站还包括: 存储单元, 用于存储所述预设的线性组合系数集。
在第五种可能的实现方式中, 结合第三种可能的实现方式或者 第四种可能实现的方式, 所述发送单元还用于, 通过系统广播将所 述预设的线性组合系数集发送给所述用户设备集中每个用户设备。 在第六种可能的实现方式中, 结合第三种可能的实现方式或者 第四种可能的实现方式或者第五种可能实现的方式, 所述预设的线 性组合系数集中线性组合系数的顺序与时间或子帧号顺序绑定。 第四方面, 提供了一种用户设备, 所述用户设备属于用户设备 集, 所述用户设备集包括至少两个用户设备;
所述用户设备包括:
接收单元, 用于接收基站发送的 m个线性组合包, 所述 m个线 性组合包中每个线性组合包分别为 n个原始数据包的线性组合, 所 述 m个线性组合包中的任意 n个线性组合包的系数构成满秩矩阵; 所述 n为大于或等于 2 的自然数, 所述 m大于或等于所述 η , ; 确认单元, 用于确认所述接收单元接收到的所述线性组合包的 个数是否小于所述 η ;
发送单元, 用于在所述确认单元确认所述线性组合包的个数小 于所述 η后, 向所述基站发送反馈信息, 以使得所述基站根据所述 反馈信息向所述用户设备集中每个用户设备发送重传线性组合包, 所述重传线性组合包的系数与所述 m 个线性组合包的系数均不相 同, 且与所述 m个线性组合包中的任意 n- 1个线性组合包的系数构 成满秩矩阵。 在第一种可能的实现方式中, 根据第四方面, 所述发送单元具 体用于: 在公共反馈信道上向所述基站发送反馈信息。
在第二种可能的实现方式中, 结合第一种可能的实现方式, 所 述接收单元还用于, 通过系统广播接收所述基站发送的所述公共反 馈信道的配置信息。
在第三种可能的实现方式中, 结合第四方面或第一种可能的实 现方式或第二种可能的实现方式, 所述接收单元具体用于: 接收基 站发送的 m个线性组合包, 所述 m个线性组合包由所述基站根据预 设的线性组合系数集、 按顺序使用所述线性组合系数集中的 m个线 性组合系数向所述用户设备集中的每个用户设备发送的, 所述线性 组合系数集中的 n个线性组合系数构成满秩矩阵。
在第四种可能的实现方式中, 结合第三种可能的实现方式, 所 述接收单元还用于: 接收重传线性组合包, 所述重传线性组合包为 所述基站根据预设的线性组合系数集, 按顺序使用所述线性组合系 数集中的第 m+ 1个线性组合系数向所述用户设备集中的每个用户设 备发送。
在第五种可能的实现方式中, 结合第三种可能的实现方式或第 四种可能的实现方式, 所述用户设备还包括: 存储单元, 用于存储 所述预设的线性组合系数集。 在第六种可能的实现方式中, 结合第三种可能的实现方式或第 四种可能的实现方式, 所述接收单元还用于, 接收所述基站通过系 统广播发送的所述预设的线性组合系数集。
在第七种可能的实现方式中, 结合第三种可能的实现方式或第 四种可能的实现方式或第五种可能的实现方式, 所述预设的线性组 合系数集中线性组合系数的顺序与时间或子帧号顺序绑定。
第五方面, 提供了一种组播重传的系统, 包括上述任一项所述 的基站以及至少两个上述任一项所述的用户设备。 本发明实施例提供的一种组播重传的方法、 设备及系统, 通过 对原始数据包的线性变换, 当基站接收到用户设备发送的返馈信息 后, 基站向全部用户设备发送重传线性组合包, 用户设备可以通过 解线性多元一次方程组, 把原始数据包恢复出来, 从而利提高组传 输的重传效率。 解决了现有技术中无论哪个具体包发生错误, 基站 均需重传该具体包, 造成重传资源的浪费, 组传输的重传效率较低 的问题。
附图说明 为了更清楚地说明本发明实施例或现有技术中的技术方案, 下 面将对实施例或现有技术描述中所需要使用的附图作简单地介绍, 显而易见地, 下面描述中的附图仅仅是本发明的一些实施例, 对于 本领域普通技术人员来讲, 在不付出创造性劳动的前提下, 还可以 根据这些附图获得其他的附图。
图 1 为现有技术中一种组播重传方法的原理示意图;
图 2为本发明实施例提供的一种组播重传的方法流程图; 图 3为本发明实施例提供的另一种组播重传的方法流程图; 图 4为本发明实施例提供的另一种组播重传的方法流程图; 图 5为本发明实施例提供的一种线性变换示意图图; 图 6为本发明实施例提供的一种组播 /反馈 /重传机制示意图; 图 7为本发明实施例提供的一种基站的装置结构图;
图 8为本发明实施例提供的另一种基站的装置结构图; 图 9为本发明实施例提供的一种基站的硬件结构图; 图 10为本发明实施例提供的一种用户设备的装置结构图; 图 1 1 为本发明实施例提供的另一种用户设备的装置结构图; 图 12为本发明实施例提供的一种用户设备的硬件结构图。 具体实施方式
下面将结合本发明实施例中的附图, 对本发明实施例中的技术方案进 行清楚、 完整地描述, 显然, 所描述的实施例仅仅是本发明一部分实施例, 而不是全部的实施例。 基于本发明中的实施例, 本领域普通技术人员在没 有做出创造性劳动前提下所获得的所有其他实施例, 都属于本发明保护的 范围。
参见图 1 , 为现有技术中一种组播重传方法的原理示意图, 假设 基站需要将包 x l、 包 x2 和包 x3 分别发送给用户设备 ( User equipment , 简称 UE ) UE 1、 UE2和 UE3 , 其中 x l、 χ2和 χ3分另' J为 三个数据包,基站组播了包 x l之后,若用户设备确认 UE3发生丟包, 则 UE3反馈包 x l接收错误或者丟失, 基站为 UE3 重新传输一次包 x l ; 基站传输第二个包 x2 , 若 UE 1发生丟包, 则 UE 1反馈 x2接收 错误或者丟失, 基站给 UE 1 重传 x2 ; 基站传输第三个包 x3 , x3 均 接收正确。 从上述分析可以看出, 在多个数据包传输发生接收错误或者丟 失时, 基站均需重传发生接收错误或者丟失的多个数据包, 造成重 传资源的浪费, 组传输的重传效率较低。 本发明实施例对重传时间不做限制, 但对于稳定的组播业务具 有更好的实施效果, 例如针对智能抄表终端的统一升级信息, 车载 终端的区域交通路况广播信息, 或者区域广告推送消息, 上述只是 本发明的应用场景的举例, 本发明包括并不限于此。
本发明实施例所提供的方法可以应用于各种通信系统, 例如, 全球移动通讯系统 ( Global System of Mobile communication , 简称 GSM ) 网络、 通用分组无线服务技术 ( General Packet Radio Service 简称, GPRS )网络、 宽带码分多址( Wideband Code Division Multiple Access , 简称 WCDMA ) 网络、 CDMA-2000 网络、 时分同步码 多址 ( Time Division- Synchronous Code Division Multiple Access , 简 称 TD-SCDMA ) 网 络 或 全 球 微 波 互 联 接 入 ( Worldwide Interoperability for Microwave Access WiMAX , 简称)网络等。 下面, 本发明实施例将以系统架构演进( System Architecture Evolution , 简 称 SAE ) /长期演进 ( Long-Term Evolution , 简称 LTE ) 网络为例进 行说明, 当然本发明并不限于这个场景。
示例性的 , SAE/LTE 网络可以 包括无线接入网 节点 ( 如 eNodeB )、核心网节点(如移动管理实体 MME : Mobility Management Entity ) ,服务网关( S-GW : Server Gateway )和分组数据网关( P-GW : Packet Data Network Gateway )。 其中, 无线接入网节点用于向用户设备提供空中接口, 以便用 户设备接入 SAE/LTE 网络。 核心网节点是控制面实体, 用于负责 SAE/LTE 网络的核心网控制功能, 执行用户设备的移动管理和会话 管理。 服务网关和分组数据网关可以是用户面实体, 用于向用户设 备提供数据传输服务。
一方面, 本发明实施例提供一种组播重传的方法, 参见图 2 , 包 括:
S201 :基站向用户设备集中每个用户设备发送 m个线性组合包, 所述 m个线性组合包中每个线性组合包分别为 n个原始数据包的线 性组合, 所述 m个线性组合包中的任意 n个线性组合包的系数构成 满秩矩阵; 所述 n为大于或等于 2的自然数, 所述 m大于或等于所 述 n , 所述用户设备集包括至少两个用户设备;
示例性的, 该用户设备集由该基站覆盖范围内的需要接收组播 业务的用户设备组成, 其中用户设备集至少包含两个用户设备, 但 是用户设备集中具体包含多少用户设备, 因为对本发明 目 的实现不 构成影响, 本实施例不具体进行限定, 例如, 该用户设备集可以包 含该基站覆盖范围内的需要接收组播业务所有的用户设备。
S202 : 若所述基站接收到所述用户设备集中至少一个用户设备 发送的反馈信息, 所述基站向所述用户设备集中的每个用户设备发 送重传线性组合包, 所述重传线性组合包的系数与所述 m个线性组 合包的系数均不相同, 且与所述 m个线性组合包中的任意 n- 1 个线 性组合包的系数构成满秩矩阵。 示例性的, 不同的用户设备发送的反馈信息可以包含相同的内 容, 用于指示基站 "有的 UE收到的线性组合包的系数无法构成满秩 矩阵进而解出原始数据包, 需要加传新的线性组合包"。 例如, 该反 馈信息可以是否定应答 ( Negative Acknowledgement , 简称 NACK ) 信息。
本发明实施例提供的一种组播重传的方法, 通过对原始数据包 的线性变换, 当基站接收到用户设备发送的反馈信息后, 基站向全 部用户设备发送重传线性组合包, 用户设备可以通过解线性多元一 次方程组, 把原始数据包恢复出来, 从而提高组传输的重传效率。 解决了现有技术中无论哪个具体包发生错误, 基站均需重传该具体 包, 造成重传资源的浪费, 组传输的重传效率较低的问题。 进一步的, 所述基站接收到所述用户设备集中至少一个用户设 备发送的反馈信息可以包括,
所述基站在公共反馈信道上接收到所述用户设备集中至少一个 用户设备发送的反馈信息。
示例性的, 多个 UE可以同时发送反馈信息, 例如 NACK, 由于 不同 UE发送的反馈信息内容相同, 所以多个 UE的反馈信息只是能 量上的叠加。 进一步的, 所述方法还可以包括: 所述基站通过系统广播将所 述公共反馈信道的配置信息发送给所述用户设备集中的每个用户设 备。
进一步的, 所述基站向所述用户设备集中每个用户设备发送 m 个线性组合包, 可以包括: 所述基站根据预设的线性组合系数集, 按顺序使用所述线性组 合系数集中的 m个线性组合系数向每个用户设备发送 m个线性组合 包, 所述线性组合系数集中的 n 个线性组合系数构成满秩矩阵; 所 述基站向所述用户设备集中每个用户设备发送重传线性组合包, 包 括: 所述基站根据预设的线性组合系数集, 按顺序使用所述线性组 合系数集中的第 m+ 1个线性组合系数向所述用户设备集中每个用户 设备发送所述重传线性组合包。
示例性的, 该预设的线性组合系数集包含多个线性组合系数, 本实施例中将该预设的线性组合系数集中包含的线性组合系数的总 个数称为 T , 该 T应大于或等于 m+ 1 , 优选的, T远大于 m , 从而 确保在可能次数的重传中, 使用的线性组合系数不重复。 优选的, T 可以根据线性运算伽罗华域的空间大小等因素确定。
该线性组合系数集中的任意 n 个线性组合系数构成满秩矩阵, 即: 从 T 个向量中任取 n (线性组合数据包中原始数据包的个数) 个向量, 都能构成一个 n阶满秩矩阵。 使得收到 n个线性组合数据 包的用户设备可以通过该 n阶满秩矩阵求逆, 得到 n个原始数据包。 优选的, 为了使用户设备知道基站发送线性数据包所使用的线性组 合系数, 基站按"顺序"使用 "预设"的线性组合系数集, 使基站和用 户设备在系数上同步。
例如, 基站先发送 m个线性组合包, 优选的, 为了确保大部分 UE都能至少收到 n个线性组合包, 可以预先考虑一定的丟包率, 使 m>n , 若仍有 UE收到少于 n个的线性组合包, 该 UE向基站发送反 馈信息, 例如反馈 NACK , 基站收到反馈信息, 不需知道哪个 UE 的哪个包出了错, 只需要向用户设备集中的每个 UE传输第 m+ 1 个 线性组合包 (重传线性组合包), 这 m+ 1 个线性组合包也是"顺序" 使用"预设"的线性组合系数集, 因为第 m+ 1 个线性组合包和之前 m 个线性组合包使用的系数都不一样, 使得收到少于 n 个的线性组合 包的 UE 可以 居新的第 m+ 1 个个线性组合包与之前收到的线性组 合包结合, 若可以构成 n阶满秩矩阵, 可以通过该 n阶满秩矩阵求 逆, 得到 n个原始数据包。
进一步的, 所述方法还包括: 所述基站存储所述预设的线性组合系数集; 或者,
所述基站通过系统广播将所述预设的线性组合系数集发送给所 述用户设备集中每个用户设备。 进一步的, 所述预设的线性组合系数集中线性组合系数的顺序 与时间或子帧号顺序绑定。
进一步的, 若所述基站接收不到任何一个用户设备发送的反馈 信息, 所述基站不再向所述用户设备集中每个用户设备发送重传线 性组合包。
另一方面,本发明实施例提供另一种组播重传的方法,参见图 3 , 包括:
S301 : 用户设备集中的第一用户设备接收基站发送的 m个线性 组合包, 所述 m个线性组合包中每个线性组合包分别为 n个原始数 据包的线性组合, 所述 m个线性组合包中的任意 n个线性组合包的 系数构成满秩矩阵; 所述 n为大于或等于 2的自然数, 所述 m大于 或等于所述 n ;
S302 : 若所述第一用户设备收到的所述线性组合包的个数小于 所述 n , 所述第一用户设备向所述基站发送反馈信息, 以使得所述基 站根据所述反馈信息向所述用户设备集中每个用户设备发送重传线 性组合包, 所述重传线性组合包的系数与所述 m个线性组合包的系 数均不相同, 且与所述 m个线性组合包中的任意 n- 1 个线性组合包 的系数构成满秩矩阵。
示例性的, 不同的用户设备发送的反馈信息可以包含相同的内 容, 用于指示基站 "有的 UE收到的线性组合包的系数无法构成满秩 矩阵进而解出原始数据包, 需要加传新的线性组合包"。 例如, 该反 馈信息可以是 NACK:。 本发明实施例提供的一种组播重传的方法, 通过对原始数据包 的线性变换, 当用户设备收到的线性组合包的个数小于原始数据包 的个数时, 向基站发送反馈信息, 使得基站向全部用户设备发送重 传线性组合包, 用户设备可以通过解线性多元一次方程组, 把原始 数据包恢复出来, 从而提高组传输的重传效率。 解决了现有技术中 无论哪个具体包发生错误, 基站均需重传该具体包, 造成重传资源 的浪费, 组传输的重传效率较低的问题。 进一步的, 所述向所述基站发送反馈信息包括: 在公共反馈信道上向所述基站发送反馈信息。
进一步的, 所述方法还包括, 所述第一用户设备通过系统广播 接收所述基站发送的所述公共反馈信道的配置信息。 进一步的, 所述用户设备集中的第一用户设备接收基站向发送 的 m个线性组合包包括: 所述用户设备集中的第一用户设备接收基站发送的 m个线性组 合包,所述 m个线性组合包由所述基站根据预设的线性组合系数集、 按顺序使用所述线性组合系数集中的 m个线性组合系数向所述用户 设备集中的每个用户设备发送, 所述线性组合系数集中的 n 个线性 组合系数构成满秩矩阵。
进一步的, 所述方法还包括: 所述第一用户设备接收重传线性组合包, 所述重传线性组合包 为所述基站根据预设的线性组合系数集, 按顺序使用所述线性组合 系数集中的第 m+ 1个线性组合系数向所述用户设备集中的每个用户 设备发送。
进一步的, 所述方法还包括: 所述第一用户设备存储所述预设的线性组合系数集; 或者, 所述第一用户设备接收所述基站通过系统广播发送的所述预设 的线性组合系数集。
进一步的, 所述预设的线' 1"生组合系数集中线性组合系数的顺序 与时间或子帧号顺序绑定。
进一步的, 若所述用户设备收到的所述线性组合包的个数等于 所述 n , 则不向所述基站发送反馈信息。
下面通过具体实施例对上述方法实施例进行说明, 参见图 4 , 包 括:
S401 :基站向用户设备集中每个用户设备发送 m个线性组合包, 所述 m个线性组合包中每个线性组合包分别为 n个原始数据包的线 性组合, 所述 m个线性组合包中的任意 n个线性组合包的系数构成 满秩矩阵; 所述 n为大于或等于 2的自然数, 所述 m大于或等于所 述 n;
示例性的, 本实施例可以釆用基站连续组播多个数据, UE统一 反馈的机制, 例如, 基站可以连续组播 n个原始数据包后, UE再统 一反馈, 其中, n可以为大于或等于 2的自然数, 基站向 UE发送 m 个线性组合包 ( m大于或等于 n), 该 m个线性组合包分别为 n个原 始数据包的线性组合, UE根据接收到的线性组合包计算出 n个原始 数据, 为了使得 UE能够将 n个原始数据包计算出来, 基站发送的 m 个线性组合包需满足: m个线性组合包中的任意 n个线性组合包的 系数构成满秩矩阵。 本实施例以与图 1 相同的场景为例进行说明, 即 n=3, 用户设 备集包含 UE1、 UE2和 UE3, 基站向 UE1、 UE2和 UE3连续组播原 始数据包 xl、 x2和 x3。 基站对原始数据包 xl、 x2和 x3 进行线性变换, 可以获得不同 的线性组合包, 每个线性组合包均为原始数据包 xl、 x2和 x3 的线 性组合。
参见图 5,为对原始数据包 xl、x2和 x3进行线性变换的示意图, 原始数据包 xl、 x2和 x3分别通过线性系数 pl、 p2和 p3线性变换后 生成三个线性组合包 c 1、 c2和 c3。 其中,
c\ = x\* p\\ + x2* p\2 + χ3* ρ\3 c2 = x\* ρ2\ + χ2* ρ22 + χ3* ρ23 cl> = χ\* pl>\ + χ2* ρ32 + χ3* ρ31> 若 UE1、 UE2和 UE3 分别收到线性组合包 cl、 c2和 c3, 则可 以通过解线性三元一次方程组, 4巴原始数据包 xl、 x2和 x3 恢复出 来。
为了使得 UE能够将原始数据包 xl、 x2和 x3恢复出来, 基站发 送的线性组合包个数 m应大于等于 3, 且基站发送的 m个线性组合 包中的任意 3 个线性组合包的系数构成满秩矩阵。 例如, 本实施例 以 m=3为例进行说明, ρί、 ρ2和 ρ3可以分别为:
pi = [ρ11,ρ12,ρ13] = [1,0,0]
ρ2^[ρ21,ρ22,ρ23]^ [0,1,0]
ρ3 = [ρ31, 32, 33] = [0,0,1]。
S402: 若用户设备收到的线性组合包的个数小于 η, 则向基站 发送反馈信息;
示例性的, 若 UE收到的线性组合包的个数小于 η, 则 UE不能 通过解方程恢复出 n个原始数据包, UE向基站发送反馈信息, 以使 基站进行重传, 例如, 当 n=3时, 若 UE收到的线性组合包个数为 2, 则 UE不能通过解方程恢复出 3个原始数据包, UE向基站发送反馈 信息, 例如, UE向基站反馈 NACK, 因为不必指出是哪个 UE接收 错误或者丟包, 该反馈信息不包含 UE的标识信息。
优选的, 若多个 UE收到的线性组合包的个数均小于 n, 则该多 个 UE 可以在公共反馈信道上向基站发送反馈信息, 以节约反馈资 源。 该公共反馈信道的配置信息可以由基站通过系统广播发送给每 个 UE。
例如, 若 UE3在 c 1接收出错, UE 1在 c2接收出错, 而 UE 1、 UE2和 UE3 均正确接收 c3, 则 UE3和 UE1 可以在公共反馈信道上 向基站发送反馈信息, 且 UE3 和 UE1 的反馈信息中不包含 UE3 和 UE1 的标识信息, 优化了反馈机制。
S403: 若用户设备收到的线性组合包的个数大于等于 n, 则不 向基站发送反馈信息;
示例性的, 若 UE收到的线性组合包的个数大于等于 n, 则 UE 从接收的线性数据包中任意选出 n个再通过解方程即可恢复出 n个 原始数据包。
S404: 基站根据反馈信息向用户设备集中每个用户设备发送重 传线性组合包, 重传线性组合包的系数与所述 m个线性组合包的系 数均不相同, 且与所述 m个线性组合包中的任意 n-1 个线性组合包 的系数构成满秩矩阵。 示例性的, 若基站收到任何一个 UE发送的反馈信息, 则基站不 必知道具体是哪个 UE接收哪个线性组合包错误, 只需再向所有 UE 发送一个重传线性组合包即可, 该重传线性组合包的系数与之前发 送的 m个线性组合包的系数均不相同, 且与之前发送的 m个线性组 合包中的任意 n- 1个线性组合包的系数构成满秩矩阵。 例如, 若 UE3在 c 1接收出错, UE 1在 c2接收出错, 而 UE 1、 UE2和 UE3均正确接收 c3 , 基站在公共反馈信道上收到 UE3和 UE 1 发送的反馈信息, 基站只需再发送一个与之前发送的三个线性数据 包 c l、 c2和 c3均不相同的线性数据包 c4即可, 该 c4需要与之前发 送的 c l、 c2 和 c3 中任意两个构成满秩矩阵, 以使得 UE 能够根据 c4解三元一次方程组恢复出 x l、 x2和 x3 , 示例性的, c4的系数可 以为 p 4 = [p \, P42, P43] = [1,1,1]。 此时, 本发明实施例提供的组传输的发送 /反馈 /重传机制可以如图 6所示。 进一步, 若基站未接收到任何一个用户设备发送的反馈信息, 则基站不再向每个用户设备发送重传线性组合包。
示例性的, 若基站接收不到任何一个 UE发送的反馈信息, 说明 每个 UE都完成了数据包的接收,基站不再 UE发送重传线性组合包, 在实际应用中, 基站可以根据实际情况自行判断不再需要发送重传 线性组合包。
优选的, 本发明实施例提供一种优选的实施方式。
基站可以根据预设的线性组合系数集, 按顺序使用该线' f生组合 系数集中的 m个线性组合系数向用户设备集中每个用户设备发送 m 个线性组合包, 该线性组合系数集中的任意 n 个线性组合系数构成 满秩矩阵; 例如, 该线性组合系数集可以为 P ,
Figure imgf000017_0001
若基站收到任意一个 U E发送的反馈信息,则根据该预设的线 ' fi 组合系数集 P , 按顺序使用第 m+1 个线性组合系数向每个用户设备 发送重传线性组合包, 以此类推, 直至全部 UE接收正确, 基站不再 发送重传线性组合包。 其中, 该预设的线性组合系数集 P 可以存储 于基站和每个 UE中, 也可以由基站通过系统广播发送给每个 UE。 优选的, 该预设的线性组合系数集 P 中线性组合系数的顺序可 以与时间或子帧号顺序绑定, 以方便的确定基站第一次发送的线' 1"生 组合包使用的是线性组合系数集 P中的哪个元素。 本发明实施例提供的一种组播重传的方法, 通过对原始数据包 的线性变换, 当基站接收到用户设备发送的反馈信息后, 基站向全 部用户设备发送重传线性组合包, 用户设备可以通过解线性三元一 次方程组, 把原始数据包恢复出来, 从而提高组传输的重传效率。 解决了现有技术中无论哪个具体包发生错误, 基站均需重传该具体 包, 造成重传资源的浪费, 组传输的重传效率较低的问题。
下面通过一个具体应用实例说明本发明实施例的效果: 假设基站给 100个 UE组播数据, 总共组播了 100个包, 然后 UE 1 接收第 一个 包 出 错, UE2 接收第二个 包 出 错, 以此类 推 UE 100接收第 100个包出错。 这种情况下, 现有技术 UE 1 至
UE 100 分别需要向基站发送反馈信息, 且每个 UE 都需要用专用反 馈资源反馈, 所以至少要消耗 100份反馈资源, 然后基站根据 UE 1 至 UE 100的反馈信息需要分别向 UE 1 至 UE 100重传每个 UE接收 错误的包, 相当于分别把每个包都重发一次, 也占用 100 份重传资 源。
而本发明实施例的方法, 在发送完 100个线性组合包之后, 所 有 UE在一个公共反馈信道反馈一次 NACK (只占一份反馈资源 ) , 然后基站无需发送 100 个原始数据包, 只用多传输一次新的线性组 合即可, 只占用一份重传资源。 所以大大提高了重传效率, 优化了 反馈机制。
一方面, 本发明实施例提供一种基站 70 , 参见图 7 , 该基站 70 包括:
发送单元 701 , 用于向用户设备集中每个用户设备发送 m个线 性组合包, 所述 m个线性组合包中每个线性组合包分别为 n个原始 数据包的线性组合, 所述 m个线性组合包中的任意 n个线性组合包 的系数构成满秩矩阵; 所述 n为大于或等于 2的自然数, 所述 m大 于或等于所述 n , 所述用户设备集包括至少两个用户设备;
接收单元 702 , 用于在所述发送单元发送所述 m个线性组合包 后, 接收所述用户设备集中至少一个用户设备发送的反馈信息; 所述发送单元 701 用于, 若所述接收单元 702接收到所述用户 设备集中至少一个用户设备发送的反馈信息, 向所述用户设备集中 的每个用户设备发送重传线性组合包, 所述重传线性组合包的系数 与所述 m个线性组合包的系数均不相同, 且与所述 m个线性组合包 中的任意 n- 1个线性组合包的系数构成满秩矩阵。 本发明实施例提供的一种基站 70 , 通过对原始数据包的线性变 换, 当基站 70接收到用户设备发送的反馈信息后, 基站 70 向全部 用户设备发送重传线性组合包, 用户设备可以通过解线性多元一次 方程组, 把原始数据包恢复出来, 从而提高组传输的重传效率。 解 决了现有技术中无论哪个具体包发生错误, 基站均需重传该具体包, 造成重传资源的浪费, 组传输的重传效率较低的问题。
其中, 所述接收单元 702 具体用于, 在公共反馈信道上接收到 所述用户设备集中至少一个用户设备发送的反馈信息。
进一步的, 所述发送单元 701 还用于, 通过系统广播将所述公 共反馈信道的配置信息发送给所述用户设备集中的每个用户设备。
其中, 所述发送单元 701 具体用于: 根据预设的线性组合系数 集, 按顺序使用所述线性组合系数集中的 m个线性组合系数向所述 用户设备集中的每个用户设备发送 m个线性组合包, 所述线性组合 系数集中的 n 个线性组合系数构成满秩矩阵; 以及当所述接收单元 702接收到至少一个用户设备发送的反馈信息,根据所述预设的线性 组合系数集, 按顺序使用所述线性组合系数集中的第 m+ 1个线性组 合系数向所述用户设备集中的每个用户设备发送所述重传线性组合 包。
进一步的, 参见图 8 , 所述基站 70还包括:
存储单元 703 , 用于存储所述预设的线性组合系数集。 进一步的, 所述发送单元 701 还用于, 通过系统广播将所述预 设的线性组合系数集发送给所述用户设备集中每个用户设备。
进一步的, 所述预设的线性组合系数集中线性组合系数的顺序 与时间或子帧号顺序绑定。
一方面, 本发明实施例提供另一种基站 70 , 参见图 9 , 该基站 70 包括:
发送器 901 , 用于向用户设备集中每个用户设备发送 m个线性 组合包, 所述 m个线性组合包中每个线性组合包分别为 n个原始数 据包的线性组合, 所述 m个线性组合包中的任意 n个线性组合包的 系数构成满秩矩阵; 所述 n为大于或等于 2的自然数, 所述 m大于 或等于所述 n , 所述用户设备集包括至少两个用户设备;
接收器 902 , 用于在所述发送器 901 发送所述 m个线性组合包 后, 接收所述用户设备集中至少一个用户设备发送的反馈信息; 所述发送器 901 用于, 若所述接收单元 702接收到所述用户设 备集中至少一个用户设备发送的反馈信息, 向所述用户设备集中的 每个用户设备发送重传线性组合包, 所述重传线性组合包的系数与 所述 m个线性组合包的系数均不相同, 且与所述 m个线性组合包中 的任意 n- 1个线性组合包的系数构成满秩矩阵。 本发明实施例提供的一种基站 70 , 通过对原始数据包的线性变 换, 当基站 70接收到用户设备发送的反馈信息后, 基站 70 向全部 用户设备发送重传线性组合包, 用户设备可以通过解线性多元一次 方程组, 把原始数据包恢复出来, 从而提高组传输的重传效率。 解 决了现有技术中无论哪个具体包发生错误, 基站均需重传该具体包, 造成重传资源的浪费, 组传输的重传效率较低的问题。
其中, 所述接收器 902 具体用于, 在公共反馈信道上接收到所 述用户设备集中至少一个用户设备发送的反馈信息。
进一步的, 所述发送器 901 还用于, 通过系统广播将所述公共 反馈信道的配置信息发送给所述用户设备集中的每个用户设备。 其中, 所述发送器 901具体用于: 根据预设的线性组合系数集, 按顺序使用所述线性组合系数集中的 m个线性组合系数向所述用户 设备集中的每个用户设备发送 m个线性组合包, 所述线性组合系数 集中的 n个线性组合系数构成满秩矩阵; 以及当所述接收器 902接 收到至少一个用户设备发送的反馈信息, 根据所述预设的线性组合 系数集, 按顺序使用所述线性组合系数集中的第 m+ 1个线性组合系 数向所述用户设备集中的每个用户设备发送所述重传线性组合包。
进一步的, 所述基站 70还包括: 存储器 903 , 用于存储所述预设的线性组合系数集。
进一步的, 所述发送器 901 还用于, 通过系统广播将所述预设 的线性组合系数集发送给所述用户设备集中每个用户设备。
进一步的, 所述预设的线' 1"生组合系数集中线性组合系数的顺序 与时间或子帧号顺序绑定。
一方面, 本发明实施例提供一种用户设备 100 , 所述用户设备属 于用户设备集, 所述用户设备集包括至少两个用户设备, 参见图 10 , 所述用户设备 100 包括:
接收单元 1001 , 用于接收基站发送的 m个线性组合包, 所述 m 个线性组合包中每个线性组合包分别为 n个原始数据包的线性组合, 所述 m个线性组合包中的任意 n个线性组合包的系数构成满秩矩阵; 所述 n为大于或等于 2的自然数, 所述 m大于或等于所述 n;
确认单元 1002 , 用于确认所述接收单元接收到的所述线性组合 包的个数是否小于所述 n;
发送单元 1003 , 用于用于在所述确认单元确认所述线性组合包 的个数小于所述 n后, 向所述基站发送反馈信息, 以使得所述基站 根据所述反馈信息向所述用户设备集中每个用户设备发送重传线性 组合包, 所述重传线性组合包的系数与所述 m个线性组合包的系数 均不相同, 且与所述 m个线性组合包中的任意 n- 1 个线性组合包的 系数构成满秩矩阵。 本发明实施例提供的一种用户设备 100 ,当用户设备 100收到的 线性组合包的个数小于原始数据包的个数时, 向基站发送反馈信息, 使得基站向全部用户设备 100 发送重传线性组合包, 用户设备 100 可以通过解线性多元一次方程组, 把原始数据包恢复出来, 从而提 高组传输的重传效率。 解决了现有技术中无论哪个具体包发生错误, 基站均需重传该具体包, 造成重传资源的浪费, 组传输的重传效率 较低的问题。
其中, 所述发送单元 1003具体用于: 在公共反馈信道上向所述 基站发送反馈信息。
进一步的, 所述接收单元 1001 还用于, 通过系统广播接收 所述基站发送的所述公共反馈信道的配置信息。
其中, 所述接收单元 1001具体用于: 接收基站发送的 m个线性 组合包, 所述 m个线性组合包, 由所述基站根据预设的线性组合系 数集, 按顺序使用所述线性组合系数集中的 m个线性组合系数向所 述用户设备集中的每个用户设备发送, 所述线性组合系数集中的 n 个线性组合系数构成满秩矩阵。 进一步的, 所述接收单元 1001还用于: 接收重传线性组合包, 所述重传线性组合包为所述基站根据预设的线性组合系数集, 按顺 序使用所述线性组合系数集中的第 m+ 1个线性组合系数向所述用户 设备集中的每个用户设备发送。 进一步的,参见图 1 1 ,所述用户设备 100还包括:存储单元 1004 , 用于存储所述预设的线性组合系数集。
进一步的, 所述接收单元 1001还用于, 接收所述基站通过系统 广播发送的所述预设的线性组合系数集。
进一步的, 所述预设的线性组合系数集中线性组合系数的顺序 与时间或子帧号顺序绑定。
一方面, 本发明实施例提供另一种用户设备 100 , 属于用户设备 集, 所述用户设备集包括至少两个用户设备, 参见图 12 , 所述用户 设备 100 包括:
接收器 1201 , 用于接收基站发送的 m个线性组合包, 所述 m个 线性组合包中每个线性组合包分别为 n 个原始数据包的线性组合, 所述 m个线性组合包中的任意 n个线性组合包的系数构成满秩矩阵; 所述 n为大于或等于 2的自然数, 所述 m大于或等于所述 n;
处理器 1202 , 用于确认所述接收器接收到的所述线性组合包的 个数是否小于所述 n;
发送器 1203 , 用于在所述处理器确认所述线性组合包的个数小 于所述 n 后, 向所述基站发送反馈信息, 以使得所述基站根据所述 反馈信息向所述用户设备集中每个用户设备发送重传线性组合包, 所述重传线性组合包的系数与所述 m 个线性组合包的系数均不相 同, 且与所述 m个线性组合包中的任意 n- 1 个线性组合包的系数构 成满秩矩阵。 本发明实施例提供的一种用户设备 100 ,当用户设备 100收到的 线性组合包的个数小于原始数据包的个数时, 向基站发送反馈信息, 使得基站向全部用户设备 100 发送重传线性组合包, 用户设备 100 可以通过解线性多元一次方程组, 把原始数据包恢复出来, 从而提 高组传输的重传效率。 解决了现有技术中无论哪个具体包发生错误, 基站均需重传该具体包, 造成重传资源的浪费, 组传输的重传效率 较低的问题。
其中, 所述发送器 1203具体用于: 在公共反馈信道上向所述基 站发送反馈信息。
进一步的, 所述接收器 1201 还用于, 通过系统广播接收所 述基站发送的所述公共反馈信道的配置信息。
进一步的, 所述接收器 1201具体用于: 接收基站发送的 m个线 性组合包, 所述 m个线性组合包, 由所述基站根据预设的线性组合 系数集, 按顺序使用所述线性组合系数集中的 m个线性组合系数向 所述用户设备集中的每个用户设备发送,所述线性组合系数集中的 n 个线性组合系数构成满秩矩阵。 进一步的, 所述接收器 1201还用于: 接收重传线性组合包, 所 述重传线性组合包为所述基站根据预设的线性组合系数集, 按顺序 使用所述线性组合系数集中的第 m+ 1个线性组合系数向所述用户设 备集中的每个用户设备 100发送。
进一步的, 所述用户设备 100还包括: 存储器 1204 , 用于存储 所述预设的线性组合系数集。 进一步的, 所述接收器 1201还用于, 接收所述基站通过系统广 播发送的所述预设的线性组合系数集。
进一步的, 所述预设的线' 1"生组合系数集中线性组合系数的顺序 与时间或子帧号顺序绑定。
一方面, 本发明实施例提供一种组播重传的系统, 包括上述任 一实施例所述的基站以及至少上述任一项实施例所述的用户设备。 本发明实施例提供的一种用户设备, 基站通过将原始数据包进 行线性组合, 向用户设备发送线性组合包, 当用户设备收到的线性 组合包的个数小于原始数据包的个数时, 向基站发送反馈信息, 使 得基站向全部用户设备发送重传线性组合包, 用户设备可以通过解 线性多元一次方程组, 把原始数据包恢复出来, 从而提高组传输的 重传效率。 解决了现有技术中无论哪个具体包发生错误, 基站均需 重传该具体包, 造成重传资源的浪费, 组传输的重传效率较低的问 题。
所属领域的技术人员可以清楚地了解到, 为描述的方便和简洁, 上述描述的系统, 设备和单元的具体工作过程, 可以参考前述方法 实施例中的对应过程, 在此不再赘述。
在本申请所提供的几个实施例中, 应该理解到, 所揭露的系统, 装置和方法, 可以通过其它的方式实现。 例如, 以上所描述的装置 实施例仅仅是示意性的, 例如, 所述单元的划分, 仅仅为一种逻辑 功能划分, 实际实现时可以有另外的划分方式, 例如多个单元或组 件可以结合或者可以集成到另一个系统, 或一些特征可以忽略, 或 不执行。 另一点, 所显示或讨论的相互之间的耦合或直接耦合或通 信连接可以是通过一些接口, 装置或单元的间接耦合或通信连接, 可以是电性, 机械或其它的形式。 所述作为分离部件说明的单元可以是或者也可以不是物理上分 开的, 作为单元显示的部件可以是或者也可以不是物理单元, 即可 以位于一个地方, 或者也可以分布到多个网络单元上。 可以根据实 际的需要选择其中的部分或者全部单元来实现本实施例方案的 目 的。
另外, 在本发明各个实施例中的各功能单元可以集成在一个处 理单元中, 也可以是各个单元单独物理包括, 也可以两个或两个以 上单元集成在一个单元中。 上述集成的单元既可以釆用硬件的形式 实现, 也可以釆用硬件加软件功能单元的形式实现。
上述以软件功能单元的形式实现的集成的单元, 可以存储在一 个计算机可读取存储介质中。 上述软件功能单元存储在一个存储介 质中, 包括若干指令用以使得一台计算机设备(可以是个人计算机, 服务器, 或者网络设备等) 执行本发明各个实施例所述方法的部分 步骤。 而前述的存储介质包括: U 盘、 移动硬盘、 只读存储器
( Read-Only Memory ,简称 ROM )、随机存取存储器( Random Access Memory , 简称 RAM )、 磁碟或者光盘等各种可以存储程序代码的介 质。
最后应说明的是: 以上实施例仅用以说明本发明的技术方案, 而非对其限制; 尽管参照前述实施例对本发明进行了详细的说明, 本领域的普通技术人员应当理解: 其依然可以对前述各实施例所记 载的技术方案进行修改, 或者对其中部分技术特征进行等同替换; 而这些修改或者替换, 并不使相应技术方案的本质脱离本发明各实 施例技术方案的精神和范围。
以上所述, 仅为本发明的具体实施方式, 但本发明的保护范围 并不局限于此, 任何熟悉本技术领域的技术人员在本发明揭露的技 术范围内, 可轻易想到变化或替换, 都应涵盖在本发明的保护范围 之内。 因此, 本发明的保护范围应以所述权利要求的保护范围为准。

Claims

权 利 要 求 书
1、 一种组播重传的方法, 其特征在于, 所述方法包括:
基站向用户设备集中每个用户设备发送 m个线性组合包, 所述 m个 线性组合包中每个线性组合包分别为 n个原始数据包的线性组合, 所述 m 个线性组合包中的任意 n个线性组合包的系数构成满秩矩阵; 所述 n为大 于或等于 2的自然数, 所述 m大于或等于所述 n, 所述用户设备集包括至 少两个用户设备;
若所述基站接收到所述用户设备集中至少一个用户设备发送的反馈 信息, 所述基站向所述用户设备集中的每个用户设备发送重传线性组合 包, 所述重传线性组合包的系数与所述 m个线性组合包的系数均不相同, 且与所述 m个线性组合包中的任意 n-1 个线性组合包的系数构成满秩矩 阵。
2、 根据权利要求 1 所述的方法, 其特征在于, 所述基站接收到所述 用户设备集中至少一个用户设备发送的反馈信息包括,
所述基站在公共反馈信道上接收到所述用户设备集中至少一个用户 设备发送的反馈信息。
3、 根据权利要求 2 所述的组播重传的方法, 其特征在于, 所述方法 还包括:
所述基站通过系统广播将所述公共反馈信道的配置信息发送给所述 用户设备集中的每个用户设备。
4、 根据权利要求 1-3任一项所述的方法, 其特征在于,
所述基站向所述用户设备集中每个用户设备发送 m个线性组合包,包 括:
所述基站根据预设的线性组合系数集, 按顺序使用所述线性组合系数 集中的 m个线性组合系数向所述用户设备集中的每个用户设备发送 m个 线性组合包, 所述线性组合系数集中的 n个线性组合系数构成满秩矩阵; 所述基站向所述用户设备集中每个用户设备发送重传线性组合包, 包 括:
所述基站根据预设的线性组合系数集, 按顺序使用所述线性组合系数 集中的第 m+1 个线性组合系数向所述用户设备集中每个用户设备发送所 述重传线性组合包。
5、 根据权利要求 4所述的方法, 其特征在于: 所述方法还包括: 所述基站存储所述预设的线性组合系数集; 或者,
所述基站通过系统广播将所述预设的线性组合系数集发送给所述用 户设备集中每个用户设备。
6、 根据权利要求 4或 5所述的方法, 其特征在于:
所述预设的线性组合系数集中线性组合系数的顺序与时间或子帧号 顺序绑定。
7、 一种组播重传的方法, 其特征在于, 包括:
用户设备集中的第一用户设备接收基站发送的 m个线性组合包,所述 m个线性组合包中每个线性组合包分别为 n个原始数据包的线性组合, 所 述 m个线性组合包中的任意 n个线性组合包的系数构成满秩矩阵; 所述 n 为大于或等于 2的自然数, 所述 m大于或等于所述 n, 所述用户设备集包 括至少两个用户设备;
若所述第一用户设备收到的所述线性组合包的个数小于所述 n, 所述 第一用户设备向所述基站发送反馈信息, 以使得所述基站根据所述反馈信 息向所述用户设备集中每个用户设备发送重传线性组合包, 所述重传线性 组合包的系数与所述 m个线性组合包的系数均不相同, 且与所述 m个线 性组合包中的任意 n- 1个线性组合包的系数构成满秩矩阵。
8、 根据权利要求 7 所述的方法, 其特征在于, 所述向所述基站发送 反馈信息包括:
在公共反馈信道上向所述基站发送反馈信息。
9、 根据权利要求 8 所述的组播重传的方法, 其特征在于, 所述方法 还包括,
所述第一用户设备通过系统广播接收所述基站发送的所述公共反馈 信道的配置信息。
10、 根据权利要求 7-9任一项所述的方法, 其特征在于, 所述用户设 备集中的第一用户设备接收基站向发送的 m个线性组合包包括:
所述用户设备集中的第一用户设备接收基站发送的 m个线性组合包, 所述 m个线性组合包由所述基站根据预设的线性组合系数集、按顺序使用 所述线性组合系数集中的 m 个线性组合系数向所述用户设备集中的每个 用户设备发送,所述线性组合系数集中的 n个线性组合系数构成满秩矩阵。
11、 根据权利要求 10所述的方法, 其特征在于, 所述方法还包括: 所述第一用户设备接收重传线性组合包, 所述重传线性组合包为所述 基站根据预设的线性组合系数集, 按顺序使用所述线性组合系数集中的第 m+1个线性组合系数向所述用户设备集中的每个用户设备发送。
12、 根据权利要求 10或 11所述的方法, 其特征在于, 所述方法还包 括:
所述第一用户设备存储所述预设的线性组合系数集; 或者,
所述第一用户设备接收所述基站通过系统广播发送的所述预设的线 性组合系数集。
13、 根据权利要求 10至 12任一权利要求所述的方法, 其特征在于: 所述预设的线性组合系数集中线性组合系数的顺序与时间或子帧号 顺序绑定。
14、 一种基站, 其特征在于, 包括:
发送单元, 用于向用户设备集中每个用户设备发送 m个线性组合包, 所述 m个线性组合包中每个线性组合包分别为 n个原始数据包的线性组 合, 所述 m个线性组合包中的任意 n个线性组合包的系数构成满秩矩阵; 所述 n为大于或等于 2的自然数, 所述 m大于或等于所述 n, 所述用户设 备集包括至少两个用户设备;
接收单元, 用于在所述发送单元发送所述 m个线性组合包后,接收所 述用户设备集中至少一个用户设备发送的反馈信息;
所述发送单元用于, 若所述接收单元接收到所述用户设备集中至少一 个用户设备发送的反馈信息, 向所述用户设备集中的每个用户设备发送重 传线性组合包,所述重传线性组合包的系数与所述 m个线性组合包的系数 均不相同,且与所述 m个线性组合包中的任意 n-1个线性组合包的系数构 成满秩矩阵。
15、 根据权利要求 14 所述的基站, 其特征在于, 所述接收单元具体 用于, 在公共反馈信道上接收到所述用户设备集中至少一个用户设备发送 的反馈信息。
16、 根据权利要求 15 所述的基站, 其特征在于, 所述发送单元还用 于, 通过系统广播将所述公共反馈信道的配置信息发送给所述用户设备集 中的每个用户设备。
17、 根据权利要求 14-16任一项所述的基站, 其特征在于, 所述发送 单元具体用于: 根据预设的线性组合系数集, 按顺序使用所述线性组合系数集中的 m 个线性组合系数向所述用户设备集中的每个用户设备发送 m 个线性组合 包, 所述线性组合系数集中的 n个线性组合系数构成满秩矩阵;
以及当所述接收单元接收到至少一个用户设备发送的反馈信息, 根据 所述预设的线性组合系数集,按顺序使用所述线性组合系数集中的第 m+1 个线性组合系数向所述用户设备集中的每个用户设备发送所述重传线性 组合包。
18、 根据权利要求 17所述的基站, 其特征在于: 所述基站还包括: 存储单元, 用于存储所述预设的线性组合系数集。
19、 根据权利要求 17或 18所述的基站, 其特征在于:
所述发送单元还用于, 通过系统广播将所述预设的线性组合系数集发 送给所述用户设备集中每个用户设备。
20、 根据权利要求 17-19任一项所述的基站, 其特征在于:
所述预设的线性组合系数集中线性组合系数的顺序与时间或子帧号 顺序绑定。
21、 一种用户设备, 其特征在于, 所述用户设备属于用户设备集, 所 述用户设备集包括至少两个用户设备, 所述用户设备包括:
接收单元, 用于接收基站发送的 m个线性组合包, 所述 m个线性组 合包中每个线性组合包分别为 n个原始数据包的线性组合,所述 m个线性 组合包中的任意 n个线性组合包的系数构成满秩矩阵; 所述 n为大于或等 于 2的自然数, 所述 m大于或等于所述 n;
确认单元, 用于确认所述接收单元接收到的所述线性组合包的个数是 否小于所述 n; n后, 向所述基站发送反馈信息,' 以使得所述基站根据所述反馈信息向所 述用户设备集中每个用户设备发送重传线性组合包, 所述重传线性组合包 的系数与所述 m个线性组合包的系数均不相同, 且与所述 m个线性组合 包中的任意 n- 1个线性组合包的系数构成满秩矩阵。
22、 根据权利要求 21 所述的用户设备, 其特征在于, 所述发送单元 具体用于: 在公共反馈信道上向所述基站发送反馈信息。
23、 根据权利要求 22 所述的用户设备, 其特征在于, 所述接收单元 还用于, 通过系统广播接收所述基站发送的所述公共反馈信道的配置信 息。
24、 根据权利要求 21 -23任一项所述的用户设备, 其特征在于, 所述 接收单元具体用于: 接收基站发送的 m个线性组合包, 所述 m个线性组 合包由所述基站根据预设的线性组合系数集、 按顺序使用所述线性组合系 数集中的 m个线性组合系数向所述用户设备集中的每个用户设备发送的, 所述线性组合系数集中的 n个线性组合系数构成满秩矩阵。
25、 根据权利要求 24 所述的用户设备, 其特征在于, 所述接收单元 还用于: 接收重传线性组合包, 所述重传线性组合包为所述基站根据预设 的线性组合系数集,按顺序使用所述线性组合系数集中的第 m+1个线性组 合系数向所述用户设备集中的每个用户设备发送。
26、 根据权利要求 24或 25所述的用户设备, 其特征在于, 所述用户 设备还包括: 存储单元, 用于存储所述预设的线性组合系数集。
27、 根据权利要求 24或 25所述的用户设备, 其特征在于,
所述接收单元还用于, 接收所述基站通过系统广播发送的所述预设的 线性组合系数集。
28、 根据权利要求 24-27任一项权利要求所述的用户设备, 其特征在 于:
所述预设的线性组合系数集中线性组合系数的顺序与时间或子帧号 顺序绑定。
29、 一种组播重传的系统, 其特征在于, 包括如权利要求 14-20任一 项所述的基站以及至少两个如权利要求 21 -28任一项所述的用户设备。
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