WO2011082533A1 - 一种多载波通信的方法 - Google Patents

一种多载波通信的方法 Download PDF

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Publication number
WO2011082533A1
WO2011082533A1 PCT/CN2010/070072 CN2010070072W WO2011082533A1 WO 2011082533 A1 WO2011082533 A1 WO 2011082533A1 CN 2010070072 W CN2010070072 W CN 2010070072W WO 2011082533 A1 WO2011082533 A1 WO 2011082533A1
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Prior art keywords
data
logical channel
carrier
intermediate block
unit
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PCT/CN2010/070072
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English (en)
French (fr)
Inventor
杨涛
Original Assignee
上海贝尔股份有限公司
阿尔卡特朗讯
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.)
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Application filed by 上海贝尔股份有限公司, 阿尔卡特朗讯 filed Critical 上海贝尔股份有限公司
Priority to PCT/CN2010/070072 priority Critical patent/WO2011082533A1/zh
Priority to EP10841877A priority patent/EP2523513A1/en
Priority to JP2012547426A priority patent/JP5474217B2/ja
Priority to CN201080051111.5A priority patent/CN102652451B/zh
Priority to KR1020127020757A priority patent/KR101366517B1/ko
Priority to US13/520,726 priority patent/US20120275412A1/en
Priority to BR112012016561A priority patent/BR112012016561A2/pt
Publication of WO2011082533A1 publication Critical patent/WO2011082533A1/zh

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W28/00Network traffic management; Network resource management
    • H04W28/02Traffic management, e.g. flow control or congestion control
    • H04W28/06Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information
    • H04W28/065Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information using assembly or disassembly of packets
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/02Channels characterised by the type of signal
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/0001Arrangements for dividing the transmission path
    • H04L5/0003Two-dimensional division
    • H04L5/0005Time-frequency
    • H04L5/0007Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/0001Arrangements for dividing the transmission path
    • H04L5/0003Two-dimensional division
    • H04L5/0005Time-frequency
    • H04L5/0007Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • H04L5/001Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT the frequencies being arranged in component carriers
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/003Arrangements for allocating sub-channels of the transmission path
    • H04L5/0044Arrangements for allocating sub-channels of the transmission path allocation of payload
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management
    • H04W72/12Wireless traffic scheduling
    • H04W72/1263Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows

Definitions

  • the present invention relates to wireless communications, and more particularly to multi-carrier communications. Background technique
  • the LTE-A (Advanced Long Term Evolution) standard uses Carrier Aggregation (CA) as the primary technology to improve system performance.
  • CA Carrier Aggregation
  • the LTE-A standard supports up to five Component Carriers (CCs), each of which can have a bandwidth of up to 20 MHz.
  • CCs Component Carriers
  • TCs Component Carriers
  • transmission time interval
  • receivers such as user equipment can receive up to 5 transport blocks simultaneously in one transmission time interval.
  • the transmitter in order to maximize the utilization of the component carrier, the transmitter should be able to map the data to be transmitted of each logical channel (LCH) onto the plurality of component carriers for transmission through different transport blocks.
  • LCH logical channel
  • the number of logical channels is variable, and the amount of data to be transmitted is not the same.
  • LTE-A Release 8, R8 for short
  • only one transport block is generated in one transmission time interval. Therefore, there is no technical problem in the current standard for solving how to map data of each logical channel buffered in the Radio Link Control (RLC) layer to a plurality of component carriers for communication.
  • the present invention is directed to solving the technical problem of how to schedule each data to be communicated on multiple carriers.
  • a method for transmitting data based on multi-carriers includes the following steps: in a predetermined protocol layer, generating, for each logical channel, at least one intermediate respectively transmitted on at least one carrier Block, the at least one middle Block - each data portion including data of each logical channel transmitted on each carrier wave; in the medium access control layer, a medium access control layer protocol unit is generated for each carrier, and the protocol unit includes transmitting on the carrier The identification information of the logical channel to which each intermediate block and each intermediate block belong respectively.
  • a method for receiving data based on multiple carriers comprising the steps of: receiving, in a medium access control layer, respective medium access control layer protocols corresponding to respective carriers a unit, the protocol unit includes an intermediate block of at least one logical channel transmitted on the carrier and identification information of a logical channel to which the intermediate block belongs, each intermediate block respectively including a data of data of a logical channel transmitted on a carrier
  • the protocol unit includes an intermediate block of at least one logical channel transmitted on the carrier and identification information of a logical channel to which the intermediate block belongs, each intermediate block respectively including a data of data of a logical channel transmitted on a carrier
  • each intermediate block of the logical channel is reassembled according to the identification information of the logical channel to which each intermediate block belongs to obtain the complete data of the logical channel.
  • the predetermined protocol layer is a radio link control layer
  • the generating step includes: acquiring, from the medium access control layer, the amount of communication resources respectively provided by each carrier; and sequentially using each carrier to perform the following steps:
  • the undistributed data of the lowest transmission data amount to be transmitted of each logical channel is allocated and transmitted on the carrier, and the communication resource consumption of the carrier is used.
  • the communication resources of all carriers are exhausted, this step is ended.
  • the minimum transmitted data volume of each logical channel is allocated, and there is still a shortage of communication resources.
  • the sub-step is repeated using the next carrier until the communication resources of all carriers are exhausted, or the amount of data to be transmitted of each logical channel All are allocated;
  • each data unit including the logical channel Data is allocated to a data portion of the carrier, and when data of the logical channel is allocated to a plurality of component carriers, each data unit further includes location information of the data portion in the data of the complete logical channel;
  • the generating step generates a protocol unit for each carrier using a combination of data units corresponding to the carrier of at least one logical channel.
  • the preferred aspect uses the individual carriers independently, and can reuse the existing allocation rules to distribute the data of each logical channel on the respective carriers without having to modify the existing rules.
  • the predetermined protocol layer is a radio link control layer
  • the generating step further includes the steps of: acquiring, from the medium access control layer, a communication resource quantity that each carrier can provide; Providing a communication resource quantity, for each logical channel, selecting at least one carrier of a data part of data of the logical channel, based on a certain criterion, wherein the certain criterion is to minimize data of each logical channel is divided into multiple The number of times of transmission on the carrier; for each logical channel, generating at least one radio link control layer data unit corresponding to at least one carrier transmitting the data portion of the logical channel, as the intermediate block, the data unit including the logic
  • the data of the channel is allocated to the data portion transmitted by the carrier, and when the data of the logical channel is allocated to the plurality of carriers, each data unit further includes location information of the data portion in the data of the complete logical channel;
  • the generating step is respectively used for each carrier, corresponding to the carrier The combination of at least two data
  • the predetermined protocol layer is a medium access control layer
  • a data unit is generated, where the data unit includes the complete data of the logical channel. And providing each data unit generated to the medium access control layer,
  • the generating step further includes the following steps: The amount of communication resources that each carrier can provide, based on a certain criterion, select one or at least two carriers of each data part of the data of the logical channel respectively, the certain criterion is to minimize the data of each logical channel is divided into multiple The number of times of transmission on the carrier; when the data of the logical channel is transmitted by at least two carriers, the data unit is converted into the intermediate block, otherwise the data unit is used as the intermediate block itself;
  • the generating step uses a combination or an intermediate block corresponding to at least two intermediate blocks of the carrier to generate a protocol unit for the carrier.
  • the preferred aspect only needs the MAC layer to adaptively adjust the carrier aggregation, and uses the RLC PDU for carrier mapping.
  • the RLC layer still generates one RLC PDU for each LCH according to the provisions in R8, and does not need to make any changes to the RLC layer. .
  • this preferred aspect also reduces the occurrence of the case where the data of the LCH is divided into a plurality of segments, so that the head overhead is small.
  • the converting step is: dividing the data of the logical channel in the data unit into at least two data portions that are in one-to-one correspondence with the at least two carriers;
  • the header information of the data unit, and the header information and the at least two data portions are respectively combined into at least two sub-units, and the intermediate block is added with the identifier of the sub-unit Sequence information in all subunits.
  • This embodiment implements carrier mapping using a re-segmentation mechanism of RLC PDUs already specified in existing standards, without requiring major changes to the standard.
  • the converting step is: dividing the complete data unit into at least two segments corresponding to the at least two carriers, as the middle
  • the protocol unit includes: information indicating whether the included intermediate block is a segment of the data unit; and location information of the segment of the data unit in the associated data unit.
  • the added overhead is less than the overhead of copying the entire RLC PDU header in the previous embodiment.
  • both the segmentation information and the location information are inserted in the MAC PDU header, and the RLC PDU is not directly modified, which conforms to the principle of Layer Violation between the widely accepted protocol layers in the industry.
  • 1 is a flowchart of a protocol stack for transmitting data based on multiple carriers by a transmitter Tx and a receiver Rx according to a first embodiment of the present invention
  • FIG. 2 is a flow chart of a protocol stack for transmitting data based on multiple carriers by a transmitter Tx and a receiver Rx according to a second embodiment of the present invention
  • FIG. 3 is a flow chart of a protocol stack for data communication between a transmitter Tx and a receiver Rx based on a multi-carrier according to a third embodiment of the present invention.
  • the data for each logical channel (LCH) is buffered in a buffer in the Radio Link Control (RLC) layer.
  • RLC Radio Link Control
  • mapping of LCH data to multiple component carriers is performed in the RLC layer.
  • step S10 in the RLC layer of the transmitter Tx, for each LCH, at least one intermediate block respectively transmitted on at least one carrier, the at least one intermediate block, including Each data portion of the data of each LCH transmitted on each carrier.
  • the RLC layer obtains the communication resource amount respectively provided by each component carrier from the medium access control (MAC) layer.
  • MAC medium access control
  • the RLC layer independently allocates data of the LCH that has not been allocated to the carrier according to a predetermined rule according to the communication resource amount provided by the carrier. Specifically, with 5 component carriers CC, CC 2 , CC 3 , CC 4 And cc 5 as an example.
  • the component carrier CC If the component carrier CC! If the amount of communication resources provided is exhausted, the component carrier CC 2 is used, and according to the priority of the LCH, the minimum amount of transmitted data for which the LCH has not been allocated is allocated until the amount of communication resources provided by the component carrier CC 2 is exhausted, or each LCH is The minimum amount of transmitted data is allocated. This is the same as the rule specified by R8.
  • the above steps are repeated for the component carriers CC 3 , CC 4 and CC 5 in sequence, and the minimum transmitted data amount for which the LCH has not been allocated is allocated until the component carriers CC 3 , CC The amount of communication resources provided by 4 and CC 5 is exhausted, or the minimum amount of transmitted data of each LCH is allocated.
  • the allocation process is ended; if the minimum transmitted data amount of each LCH is allocated, and there is also a component carrier whose communication resource amount is not exhausted And using the carriers in sequence as follows: According to the amount of communication resources that the carrier does not exhaust, according to the priority order of each LCH, no data is allocated in data other than the lowest transmitted data amount to be transmitted of each LCH. The allocation is sent on the carrier. When the communication resource of the carrier is exhausted, the sub-step is repeated using the next carrier until the communication resources of all carriers are exhausted, or the amount of data to be transmitted of each LCH is allocated.
  • each LCH may be allocated multiple times, and each allocated data part may be allocated on the same or different component carriers as other data parts. If the data of the LCH is allocated on the same component carrier multiple times, the data allocated on the component carrier multiple times is continuous in the data of the complete LCH.
  • the RLC layer After the end of the allocation process, in step S104, for each LCH, the RLC layer generates at least one RLC data unit, or RLC PDU, that corresponds one-to-one with the component carriers to which the data of the LCH is allocated.
  • Each RLC PDU includes a corresponding PDU header, and The data of the LCH is allocated to the data portion of the component carrier:
  • the RLC layer When data of one LCH is allocated to one component carrier at a time, the RLC layer generates an RLC PDU including data of the LCH according to the provisions of R8 (according to existing standards, the PDU header contains an RLC PDU SN, if the value is 1 );
  • the RLC layer When at least one data portion of data of one LCH is allocated to one component carrier multiple times, the RLC layer generates an RLC PDU including the data portion of the LCH according to the specification of R8, and the data of each allocation is composed according to the order of allocation. Continuous data portion;
  • the RLC layer When data of one LCH is allocated to a plurality of component carriers multiple times, the RLC layer generates a plurality of RLC PDUs corresponding to the plurality of component carriers, wherein each RLC PDU including the data of the LCH is allocated to the component carrier
  • the data portion, and the location information of the data portion in the complete data of the LCH for example, the sequence number of the data portion in the complete data of the LCH (for example, the values contained in the PDU header are 1, 2, respectively) , 3... RLC PDU SN).
  • each LCH is mapped onto multiple component carriers.
  • Each of the generated RLC PDUs is used as each intermediate block in the present embodiment.
  • the RLC layer provides each RLC PDU to the MAC layer.
  • the RLC layer also informs the MAC layer which component carrier each RLC PDU corresponds to.
  • the MAC layer In step S12, the MAC layer generates a MAC layer protocol unit, or MAC PDU, for each component carrier.
  • the MAC PDU includes all RLC PDUs transmitted on the component carrier in the RLC PDU generated by each LCH: when there are multiple RLC PDUs on the component carrier, the MAC PDU includes a combination of the multiple RLC PDUs; When there is only one RLC PDU on the component carrier, the MAC PDU includes the RLC PDU.
  • the MAC PDU also includes identification information of the LCH to which each RLC PDU belongs, for example, in the LCH field in the header.
  • the MAC layer provides each MAC PDU to the physical (PHY) layer.
  • the transmitter Tx of the transmission block TB with five corresponding to the five MAC PDU !, TB 2, TB 3, TB 4 TB. 5 and transmitted to the receiver Rx.
  • the physical layer of the receiver Rx provides each MAC PDU to the MAC layer of the receiver Rx.
  • step S14 the MAC layer receives the corresponding points.
  • step S16 the MAC layer extracts each RLC PDU accommodated by each MAC PDU, and provides identification information of each RLC PDU and the LCH to which the RLC PDU belongs to the RLC layer.
  • step S18 for each LCH, for the data of the LCH transmitted in the plurality of RLC PDUs divided into a plurality of data parts, the RLC layer according to the LCH identification information and the RLC PDU header to which each RLC PDU belongs.
  • the data part contained in the part is in the complete location information of the LCH data, and the data parts belonging to the same LCH are merged into the complete data of the LCH.
  • the RLC layer extracts the data of the complete LCH from the one RLC PDU.
  • the RLC layer sends the data of each complete LCH to the upper layer for subsequent processing.
  • the advantages of this embodiment include: for each component carrier, the data of each LCH is allocated and transmitted on the component carrier by using the allocation process defined in R8, and the data of each LCH can be mapped to each component without modifying the existing standard. On the component carrier.
  • Second embodiment the data of each LCH is allocated and transmitted on the component carrier by using the allocation process defined in R8, and the data of each LCH can be mapped to each component without modifying the existing standard. On the component carrier.
  • mapping of LCH data to multiple component carriers is performed in the RLC layer.
  • the RLC layer determines the amount of data each LCH can transmit in the TTI before mapping the data of each LCH to the component carrier.
  • the RLC layer calculates the amount of data in which each LCH is subjected to component carrier mapping.
  • the RLC layer calculates the amount of data that each LCH can perform component carrier mapping according to the priority of each LCH.
  • step S200 the RLC layer acquires the total amount of communication resources that each carrier can provide from the MAC layer.
  • step S201 the RLC layer allocates the minimum transmit data amount to be sent of each LCH according to the priority of each LCH according to the total communication resource amount, until the communication resource amount is exhausted, or the lowest transmission of each LCH The amount of data is allocated.
  • step S202 the amount of data to be transmitted except the lowest transmitted data amount of each LCH is allocated according to the order of priority of each LCH until the amount of communication resources is exhausted, or all data to be transmitted of each LCH All are allocated.
  • the data amount of each LCH allocated in step S201, and in step S202 (if any) is the amount of data that can be transmitted by the component carrier and transmitted in the TII.
  • step S21 at least one of the data portions of the data for transmitting the LCH is selected for each LCH on the principle that the number of times the data of each LCH is divided and transmitted on the plurality of component carriers is minimized.
  • Component carrier Component carrier
  • the RLC layer For each LCH, the RLC layer generates at least one RLC layer data unit, or RLC PDU, corresponding to at least one component carrier that transmits the data portion of the LCH:
  • an RLC PDU including data of the LCH is generated according to the specification of R8;
  • each RLC PDU including data of the LCH is allocated to a data portion of the component carrier, And the location information of the data portion in the complete data of the LCH, for example, the sequence number of the data portion in the complete data of the LCH (for example, RLC PDU SN).
  • Each RLC PDU also includes other header information of the corresponding RLC PDU.
  • each LCH is mapped onto multiple component carriers.
  • Each of the generated RLC PDUs is used as each intermediate block in the present embodiment.
  • the RLC layer provides each RLC PDU to the MAC layer.
  • the RLC layer also informs the MAC layer of which component carrier wave each RLC PDU corresponds to.
  • the MAC layer generates a MAC layer protocol unit, or MAC PDU, for each component carrier.
  • the MAC PDU includes all RLC PDUs sent on the component carrier in the RLC PDU generated by each LCH:
  • the MAC PDU When there are multiple RLC PDUs on the component carrier, the MAC PDU includes a combination of the multiple RLC PDUs;
  • the MAC PDU When there is only one RLC PDU on the component carrier, the MAC PDU includes the RLC PDU.
  • the MAC PDU also includes identification information of the LCH to which each RLC PDU belongs, for example, in the LCH field in the header.
  • the MAC layer provides each MAC PDU to the physical (PHY) layer.
  • the transmitter Tx transmits five transport blocks TB TB 2 , TB 3 , TB 4 and TB 5 corresponding to the five MAC PDUs to the receiver Rx.
  • the physical layer of the receiver Rx provides each MAC PDU to the MAC layer of the receiver Rx.
  • each MAC PDU corresponding to each component carrier is received.
  • step S23 the MAC layer extracts each RLC PDU accommodated by each MAC PDU, and provides identification information of each RLC PDU and the LCH to which the RLC PDU belongs to the RLC layer.
  • step S26 for each LCH, for the data of the LCH transmitted in the plurality of RLC PDUs divided into a plurality of data parts, the RLC layer according to the LCH identification information and the RLC PDU header to which each RLC PDU belongs.
  • the data part contained in the part is in the complete location information of the LCH data, and the data parts belonging to the same LCH are merged into the complete data of the LCH.
  • the RLC layer extracts the data of the complete LCH from the one RLC PDU.
  • the RLC layer sends the data of each complete LCH to the upper layer for subsequent processing.
  • the advantages of this embodiment include that the RLC layer performs mapping of the data of the LCH to the component carrier by minimizing the number of times the data of each LCH is transmitted on the multiple component carriers, and generates a mapping corresponding to the mapped component carrier.
  • the RLC PDU reduces the occurrence of the case where the data of the LCH is divided into a plurality of segments, so that the header overhead generated by the RLC layer is small.
  • mapping of LCH data to multiple component carriers is performed in the MAC layer.
  • the RLC layer determines the amount of data each LCH can transmit in the cell. Similar to the second embodiment, As shown in FIG. 3, in step S30, the RLC layer calculates the amount of data in which each LCH is subjected to component carrier mapping.
  • the RLC layer calculates the amount of data that each LCH can perform component carrier mapping according to the priority of each LCH.
  • step S300 the RLC layer acquires the total amount of communication resources that each carrier can provide from the medium access control (MAC) layer.
  • MAC medium access control
  • step S301 the RLC layer allocates the minimum transmit data amount to be sent of each LCH according to the priority of each LCH according to the total communication resource amount, until the communication resource amount is exhausted, or the lowest transmission of each LCH The amount of data is allocated.
  • step S302 the amount of data to be transmitted other than the lowest transmitted data amount of each LCH is allocated according to the order of priority of each LCH. Until the amount of communication resources is exhausted, or the amount of data to be transmitted other than the minimum transmitted data amount of each LCH is allocated.
  • the amount of data of each LCH allocated in step S301, and in step S302 (if any) is the amount of data that can be mapped by component carrier to be transmitted in the frame.
  • the RLC layer generates an RLC PDU for each LCH according to the provisions of R8.
  • the RLC PDU includes the complete data of the LCH, and provides each RLC PDU to the MAC layer.
  • the MAC layer separately selects the number of communication resources that each component carrier can provide, and minimizes the number of times each LCH data is transmitted on multiple carriers.
  • step S33 for each LCH, when the data of the LCH is transmitted by one component carrier, the RLC PDU of the LCH itself is regarded as an intermediate block; otherwise, when the data of the LCH is transmitted by at least two component carriers
  • the RLC PDU of the LCH is converted into multiple intermediate blocks corresponding to the at least two component carriers, and the present embodiment provides the following two specific manners for converting the RLC PDU into multiple intermediate blocks.
  • the MAC layer uses the RLC PDU sub-unit (re-segmentation) mechanism specified in R8 for conversion.
  • the MAC layer divides the complete data of the LCH in the RLC PDU into at least two data parts corresponding to the at least two component carriers.
  • the MAC layer copies the header of the RLC PDU, and merges the header with the at least two data parts into at least two subunits, wherein the MAC layer sets the subunit indicator bits of the header in each subunit .
  • the MAC layer also adds sequence information identifying the subunits in all subunits. For example, the first bit added to the subunit is in the original
  • the offset in the RLC PDU in this case the length indication in the header of the generated MAC PDU can be used to indicate the length of the subunit; or join the first bit or the last of the subunit in the original RLC PDU One bit position.
  • the generated sub-units are used as intermediate blocks to implement carrier mapping.
  • Mode 1 includes the use of the RLC PDU sub-unit (re-segmentation) mechanism already specified in R8 to implement carrier mapping without major changes to the standard.
  • the MAC layer divides a complete RLC PDU into at least two segments corresponding to the at least two component carriers, as at least two intermediate blocks, to implement carrier mapping.
  • the MAC layer uses a combination or an intermediate block corresponding to at least two intermediate blocks of the component carrier to generate a MAC PDU for the component carrier, where the MAC PDU includes identification information of the LCH to which each intermediate block belongs respectively.
  • the MAC PDU includes one of the intermediate blocks of the plurality of intermediate blocks divided by one RLC PDU, the following information corresponding to the intermediate block should be further included in the MAC PDU:
  • indicates that the intermediate block is information that is divided by an RLC PDU.
  • a MSI MAC layer Segmentation Indication
  • the length of the field is 1 bit.
  • Indicates the location information of the intermediate block in the corresponding complete RLC PDU.
  • a MAC layer Segmentation Number field is created in the MAC PDU header, and the field indicates that the intermediate block is in the complete RLC PDU. Serial number.
  • one RLC PDU is the most It may be converted into 5 intermediate blocks, and the length of the MSN field is 3 bits, which is enough to respectively indicate the sequence numbers of the 5 intermediate blocks.
  • this field exists only if the MSI field is set;
  • indicates that the intermediate block is the information of the corresponding complete intermediate block of the RLC PDU.
  • a new MSE (MAC layer Segmentation End) field is added in the MAC PDU header to indicate this information.
  • the length of the field is 1 bit. In order to reduce the head overhead of the MAC PDU, this field exists only if the MSI field is set.
  • mode 2 includes that for each intermediate block, the header overhead of the MAC PDU is increased by up to 5 bits, and the added overhead is less than the overhead of copying the entire RLC PDU header. Moreover, the segmentation information and the location information of the intermediate block in the complete RLC PDU are inserted in the MAC PDU header, and the RLC PDU is not directly modified, which is consistent with the currently accepted protocol layers in the industry. -layer non-violation ) principle.
  • the MAC layer In step S34, the MAC layer generates a MAC layer protocol unit, or MAC PDU, for each component carrier.
  • the MAC PDU includes all RLC PDUs transmitted on the component carrier in the RLC PDU generated by each LCH: when there are multiple RLC PDUs on the component carrier, the MAC PDU includes a combination of the multiple RLC PDUs; When there is only one RLC PDU on the component carrier, the MAC PDU includes the RLC PDU.
  • the MAC PDU also includes identification information of the LCH to which each RLC PDU belongs, for example, in the LCH field in the header.
  • the MAC layer provides each MAC PDU to the physical (PHY) layer.
  • the transmitter Tx transmits five transport blocks TB TB 2 , TB 3 , TB 4 and TB 5 corresponding to the five MAC PDUs to the receiver Rx.
  • the physical layer of the receiver Rx provides each MAC PDU to the MAC layer of the receiver Rx.
  • step S35 each MAC PDU corresponding to each component carrier is received.
  • step S36 the MAC layer of the receiver Rx extracts each intermediate block included in each MAC PDU, and according to the identification information of the LCH corresponding to each intermediate block, each intermediate The block is reorganized into individual RLC PDUs.
  • the MAC layer extracts the intermediate block to obtain the RLC PDU.
  • the MAC layer extracts each such intermediate block and converts these intermediate blocks into respective RLC PDUs. Specifically, for the intermediate block obtained by converting the above manners 1 and 2, the MAC of the receiver Rx is converted into the following manner.
  • the MAC layer When the intermediate block is a sub-unit (re-segmentation) of the RLC PDU, for each LCH, the MAC layer reorganizes the data part of each sub-unit into the complete LCH according to the order information of each sub-unit in all sub-units. Data, and generate an RLC PDU, and merge the header with the complete data of the LCH into the RLC PDU.
  • the MAC layer merges the segments into complete RLC PDUs according to the location information contained in the MAC PDU header according to the location of each segment in the RLC PDU to which it belongs.
  • the MAC layer After reassembling each RLC PDU, the MAC layer sends each RLC PDU to the RLC layer for subsequent processing.
  • the advantage of this embodiment is that only the MAC layer needs to adjust the carrier aggregation adaptively, and the RLC PDU is used for carrier mapping; and the RLC layer still generates one RLC PDU for each LCH according to the provisions in R8, without any change. . While the invention has been illustrated and described with reference to the particular embodiments

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Description

一种多载波通信的方法 技术领域
本发明涉及无线通信, 尤其涉及多载波通信。 背景技术
目前, 多栽波通信技术得到了越来越广泛的研究和应用。 例如,
LTE-A (先进的长期演进)标准将载波汇聚( Carrier Aggregation, 简称 CA )作为主要技术, 以提高系统性能。 以目前的标准来说, LTE-A标准 支持多达 5个分量载波( Component Carrier, 简称 CC ), 每个分量载波 的带宽能高达 20MHz。 在目前的标准中商定, 在非 MIMO的情形下, 对于每个分量载波产生一个传输块(Transport Block, 简称 TB ), 这意 味着对于 LTE-A的发射机来说, 一个传输时间间隔 ( Transmission Time Interval , 简称 ΤΤΙ )会有多达 5个传输块被产生; 而用户设备等接收机 在一个传输时间间隔中可以同时接收多达 5个传输块。
在这种情况下, 为了最大化分量载波的利用率, 发射机应能够将各 个逻辑信道(LCH ) 的待发送的数据映射到这多个分量载波上, 通过不 同的传输块进行发送。 但是, 逻辑信道的个数是不定的, 并且待发送的 数据量也不尽相同。 在 LTE-A的第八版(Release 8, 简称 R8 ) 中规定, 在非 MIMO的情形下, 一个传输时间间隔中只产生一个传输块。 因此, 在目前的标准中并没有对解决如何将无线链路控制 (RLC )层中緩存的 各逻辑信道的数据映射到多个分量载波上进行通信的技术问题。 发明内容
本发明旨在解决如何将各数据调度到多载波上进行通信的技术问 题。
根据本发明的一个方面, 提供了一种基于多栽波发送数据的方 法, 其中, 包括如下步骤: 在预定协议层中, 分别对于各逻辑信道, 产生分别在至少一个载波上发送的至少一个中间块, 该至少一个中间 块——包括在各栽波上发送的各逻辑信道的数据的各数据部分; 在介 质访问控制层中,分别对于各个载波,生成介质访问控制层协议单元, 该协议单元包含在该载波上发送的各中间块和各中间块分別所属的 逻辑信道的标识信息。
相应地, 根据本发明的另一个方面, 提供了一种基于多载波接收 数据的方法, 其中, 包括如下步骤: 在介质访问控制层中, 接收—— 对应于各载波的各介质访问控制层协议单元, 该协议单元包含在该载 波上发送的至少一个逻辑信道的中间块和该中间块所属的逻辑信道 的标识信息, 各中间块分别包括在一载波上发送的一逻辑信道的数据 的一数据部分; 在预定协议层中, 分别对于各逻辑信道, 根据各中间 块所属的逻辑信道的标识信息, 将该逻辑信道的各中间块重组, 以获 得完整的该逻辑信道的数据。
以上两个方面填补了现有技术的空白, 解决了将数据映射到多个 载波上发送的技术问题。
根据本发明第一个优选的方面, 预定协议层为无线链路控制层, 所述产生步骤包括: 从介质访问控制层获取各载波分别提供的通信资 源量; 依次使用各载波进行如下步骤:
按照该载波的通信资源量,根据各逻辑信道的优先级次序, 将各逻辑信道的待发送的最低发送数据量中没有得到分配的数 据分配在该载波上发送, 当该载波的通信资源量耗尽时, 使用 下一载波重复本步骤, 当所有载波的通信资源量都耗尽时, 结 束本步骤, 当各逻辑信道的最低发送数据量均得以分配, 且还 存在通信资源量没有耗尽的的栽波时, 依次使用该些载波进行 如下子步骤:
按照该载波没有耗尽的通信资源量, 根据各逻辑信道的 优先级次序,将各逻辑信道的待发送的最低发送数据量以外 的数据中没有得到分配的数据分配在该载波上发送, ^该载 波的通信资源量耗尽时, 使用下一载波重复本子步骤, 直至 所有载波的通信资源量耗尽,或各逻辑信道的待发送数据量 均得以分配;
- 对于各逻辑信道, 产生与该逻辑信道的数据的被分配到的至少 一个分量载波——对应的至少一个无线链路控制层数据单元,作为所 述中间块, 各数据单元包括该逻辑信道的数据被分配到该载波的数据 部分, 当该逻辑信道的数据被分配到多个分量载波时, 各数据单元还 包括该数据部分在完整的该逻辑信道的数据中的位置信息;
所述生成步驟分别对于各个载波, 使用至少一个逻辑信道的、 对 应于该载波的数据单元的合并, 生成协议单元。 该优选的方面独立地 使用各个载波, 能够重用现有的分配规则将各逻辑信道的数据分配在 该各载波上, 不必对现有的规则进行修改。
根据本发明第二个优选的方面, 预定协议层为无线链路控制层, 所述产生步骤进一步包括如下步骤: 从介质访问控制层获取各载波分 别能够提供的通信资源量; 根据各载波分别能够提供的通信资源量, 对各逻辑信道, 基于一定准则, 分别选定发送该逻辑信道的数据的数 据部分的至少一个载波, 其中, 该一定准则为最小化各逻辑信道的数 据被分在多个载波上发送的次数; 对各逻辑信道, 产生与发送该逻辑 信道的数据部分的至少一个载波——对应的至少一个无线链路控制 层数据单元, 作为所述中间块, 该数据单元包括该逻辑信道的数据被 分配到该载波发送的数据部分, 当该逻辑信道的数据被分配到多个载 波时, 各数据单元还包括该数据部分在完整的该逻辑信道的数据中的 位置信息; 所述生成步骤分别对于各个载波, 使用对应于该载波的至 少两个数据单元的合并或一个数据单元, 生成对于该载波的协议单 元。 该优选的方面减少了 LCH的数据被分在多个载波发送的情况的 发生, 从而 RLC、 MAC层产生的头部开销较小。
根据本发明第三个优选的方面, 预定协议层为介质访问控制层, 在 无线链路控制层中, 分别对于各个逻辑信道, 产生一数据单元, 该数 据单元中包括完整的该逻辑信道的数据, 并将产生的各数据单元提供 给介质访问控制层,
分别对于各数据单元, 所述产生步骤进一步包括如下步骤: 根据 各载波分别能够提供的通信资源量, 基于一定准则, 选定分别发送该 逻辑信道的数据的各数据部分的一个或至少两个载波, 该一定准则为 最小化各逻辑信道的数据被分在多个载波上发送的次数; 当该逻辑信 道的数据由至少两个载波发送时, 将该数据单元转换为所述中间块, 否则将该数据单元作为所述中间块本身;
分别对于各个载波, 所述生成步骤使用对应于该载波的至少两个 中间块的合并或一个中间块, 生成对于该载波的协议单元。
该优选的方面只需要 MAC层对载波汇聚进行适应性的调整, 使 用 RLC PDU进行载波映射; 而 RLC层仍然根据 R8中的规定为每一 个 LCH产生一个 RLC PDU, 不需要对 RLC层进行任何改变。 并且, 该优选的方面也减少了 LCH的数据被分为多段的情况的发生, 从而 使头部开销较小。
在第三个方面的一个进一步优选的实施方式里,所述转换步骤为: 将该数据单元中的该逻辑信道的数据划分为与该至少两个载波一一 对应的至少两个数据部分; 复制该数据单元的头部信息, 并将头部信 息分别与该至少两个数据部分——合并为至少两个子单元,作为所述 中间块, 各子单元的头部信息中加入了标识该子单元在所有子单元中 的顺序信息。 该实施方式使用现有标准中已经规定的 RLC PDU的子 单元 ( re-segmentation ) 机制实现载波映射, 不需要对标准进行较大 改变。
在第三个方面中的另一个进一步优选的实施方式里, 所述转换步 骤为: 将完整的该数据单元划分为与该至少两个载波——对应的至少 两个分段, 作为所述中间块; 所述生成步骤中, 协议单元包括: 指示 所包含的中间块是否是数据单元的分段的信息; 以及数据单元的分段 在所属的数据单元中的位置信息。 该实施方式中, 对于每个中间块, 增加的开销比前一实施方式中复制整个 RLC PDU头部所增加的开销 少。 并且, 分段信息和位置信息都插入在 MAC PDU头部中, 不直接 对 RLC PDU进行修改, 符合目前业内广泛接受的协议层之间互不侵 犯 ( Layer Violation ) 的原则。 附图说明
通过阅读参照以下附图所作的对非限制性实施例所作的详细描 述, 本发明的以上及其它特征、 目的和优点将会变得更加明显:
图 1是根据本发明的第一个实施方式的,发射机 Tx和接收机 Rx 基于多载波进行数据通信的协议栈流程图;
图 2是根据本发明的第二个实施方式的, 发射机 Tx和接收机 Rx 基于多载波进行数据通信的协议栈流程图;
图 3是根据本发明的第三个实施方式的, 发射机 Tx和接收机 Rx 基于多载波进行数据通信的协议栈流程图。
附图中, 相同或者相似的附图标识代表相同或者相似的部件。 具体实施方式
以下以 LTE- A标准中的载波汇聚技术为例,对基于本发明的发明 构思的几个实施方式进行描述。 可以理解, 本发明并不限于 LTE-A 标准和载波汇聚技术, 而可以适用于任何多栽波通信技术。
各逻辑信道 (LCH ) 的数据缓存在无线链路控制 (RLC ) 层中的 緩存器中。
第一实施方式
本实施例在 RLC层中进行 LCH的数据到多个分量载波的映射。 如图 1所示, 首先, 在步骤 S10中, 在发射机 Tx的 RLC层中, 分别对于各 LCH, 生成分别在至少一个载波上发送的至少一个中间 块, 该至少一个中间块——包括在各载波上发送的各 LCH的数据的 各数据部分。
具体的, 在步骤 S100中, RLC层从介 ^访问控制 (MAC )层获 取各分量载波分别提供的通信资源量。
接着, 在步骤 S 102中, 依次独立地对于各载波, RLC层根据该 载波提供的通信资源量, 按照规定规则将还没有被分配的 LCH的数 据分配到该载波上。 具体的, 以 5个分量载波 CC,、 CC2、 CC3、 CC4 和 cc5为例进行说明。
首先, 使用分量载波 Cd, 根据 LCH的优先级, 依次分配优先级 从高到低的 LCH的最低发送数据量, 直至分量载波 提供的通信 资源量耗尽, 或各 LCH的最低发送数据量均得以分配。 这与 R8规定 的规则是相同的。
若分量载波 CC!提供的通信资源量耗尽, 则使用分量载波 CC2, 根据 LCH的优先级, 分配还没有得到分配 LCH的最低发送数据量, 直至分量载波 CC2提供的通信资源量耗尽, 或各 LCH的最低发送数 据量均得以分配。 这与 R8规定的规则是相同的。
若分量载波 CC2提供的通信资源量耗尽, 则依次对于分量载波 CC3、 CC4和 CC5 , 重复以上步骤, 分配还没有得到分配 LCH的最低 发送数据量, 直至分量载波 CC3、 CC4和 CC5提供的通信资源量耗尽, 或各 LCH的最低发送数据量均得以分配。
若分量载波 CC3、 CC4和 CC5提供的通信资源量耗尽, 则结束分 配过程; 若各 LCH的最低发送数据量均得以分配, 且还存在通信资 源量没有耗尽的的分量载波时, 依次使用该些载波进行如下子步骤: 按照该载波没有耗尽的通信资源量, 根据各 LCH的优先级次序, 将各 LCH的待发送的最低发送数据量以外的数据中没有得到分配的 数据分配在该载波上发送, 当该载波的通信资源量耗尽时, 使用下一 载波重复本子步骤, 直至所有载波的通信资源量耗尽, 或各 LCH的 待发送数据量均得以分配。
可以理解, 在以上分配过程中, 各 LCH 的数据可能被进行多次 分配, 并且每一次分配的数据部分有可能与其它数据部分分配在相同 或不同的分量载波上。 若 LCH的数据被多次分配在同一分量载波上, 则该多次分配在该分量载波上的各数据在完整的该 LCH的数据中是 连续的。
在分配过程结束后, 在步骤 S104中, 对于各 LCH, RLC层产生 与该 LCH的数据被分配到的分量载波一一对应的至少一个 RLC数据 单元, 或称为 RLC PDU。 各 RLC PDU包括相应的 PDU头部, 以及 该 LCH的数据中被分配到该分量载波的数据部分:
当一个 LCH的数据被一次分配给一个分量载波时, RLC层根据 R8的规定产生一个包括该 LCH的数据的 RLC PDU (根据现有标准, 该 PDU头部中含有一个 RLC PDU SN, 如值为 1 );
当一个 LCH 的数据的至少一数据部分被多次分配给一个分量载 波时, RLC层根据 R8的规定产生一个包括该 LCH的该数据部分的 RLC PDU, 该各次分配的数据按照分配的顺序组成连续的该数据部 分;
当一个 LCH的数据被多次分配到多个分量载波时, RLC层产生 与该多个分量载波——对应的多个 RLC PDU, 其中每一个 RLC PDU 包括该 LCH的数据被分配到该分量载波的数据部分, 和该数据部分 在完整的该 LCH的数据中的位置信息, 例如该数据部分在完整的该 LCH的数据中的序列号 (例如在 PDU头部中含有的值分别为 1、 2, 3......的 RLC PDU SN )。
这样,各 LCH的数据得以映射到多个分量载波上。产生的各 RLC PDU作为本实施方式的各中间块。 RLC层将各 RLC PDU提供给 MAC 层。 RLC层也将各 RLC PDU对应于哪一个分量载波告知 MAC层。
在步骤 S12中, MAC层分别对于各个分量载波, 生成 MAC层协 议单元, 或称 MAC PDU。 该 MAC PDU包括各 LCH所产生的 RLC PDU中, 在该分量载波上发送的所有 RLC PDU: 当在该分量载波上 有多个 RLC PDU时, MAC PDU包括该多个 RLC PDU的合并; 当该 分量载波上只有一个 RLC PDU时, MAC PDU包括该 RLC PDU。 该 MAC PDU还在例如头部中的 LCH字段中包括了各 RLC PDU分别所 属的 LCH的标识信息。 MAC层将各 MAC PDU提供给物理 ( PHY ) 层。
在物理层中, 发射机 Tx将与五个 MAC PDU相对应的五个传输 块 TB!、 TB2、 TB3、 TB4和 TB5发送给接收机 Rx。 接收机 Rx的物理 层将各 MAC PDU提供给接收机 Rx的 MAC层。
在接收机 Rx中, 在步骤 S14里, MAC层接收 对应于各分 量栽波的各 MAC PDU。
在步骤 S16中, MAC层提取出各 MAC PDU容纳的各 RLC PDU, 并将各 RLC PDU和该 RLC PDU所属的 LCH的标识信息提供给 RLC 层。
而后, 在步骤 S18里, 分别对于各 LCH, 对于被分为多个数据 部分而在多个 RLC PDU中传输的 LCH的数据, RLC层根据各 RLC PDU所属的该 LCH的标识信息和 RLC PDU头部中含有的该数据部 分在完整的该 LCH的数据中的位置信息, 将属于同一 LCH的各数据 部分合并为完整的该 LCH的数据。 对于没有被分为多个数据部分的 LCH的数据, RLC层从该一个 RLC PDU中提取出其中的完整的 LCH 的数据即可。 RLC层将各完整的 LCH的数据发往高层, 进行后继的 处理。
本实施方式的优点包括, 分别对于各分量载波, 使用 R8 中定义 的分配过程分配各 LCH的数据在该分量载波上发送, 不必对现有标 准进行修改, 就能够将各 LCH的数据映射到各个分量载波上。 第二实施方式
本实施例在 RLC层中进行 LCH的数据到多个分量载波的映射。 在将各 LCH的数据映射到分量载波之前, 优选地, RLC层确定 各 LCH在 TTI中各自能够发送的数据量。 如图 2所示, 在步骤 S20 中, RLC层计算各 LCH被进行分量载波映射的数据量。
在一个优选的实施方式中, RLC层根据各 LCH的优先级计算各 LCH能够进行分量载波映射的数据量。
首先, 在步骤 S200中, RLC层从 MAC层获取各载波能够提供 的总的通信资源量。
而后, 在步骤 S201 中, RLC层基于总的通信资源量, 依各 LCH 的优先级的次序, 分配各 LCH的待发送的最低发送数据量, 直至通 信资源量耗尽, 或各 LCH的最低发送数据量均得以分配。
若各 LCH 的最低发送数据量均得以分配, 且通信资源量还有剩 余, 则在步骤 S202中, 依各 LCH的优先级的次序, 分配各 LCH的 最低发送数据量之外的待发送数据量, 直至通信资源量耗尽, 或各 LCH的所有的待发送数据量均得以分配。
在步骤 S201 , 以及步骤 S202 (如果有的话) 中得以分配的、 各 LCH 的数据量为能够进行分量载波映射从而在该 TII 中发送的数据 量。
接下来, 为了减少开销, 在步骤 S21 中, 以最小化各 LCH的数 据被分在多个分量载波上发送的次数为原则, 对各 LCH,选定发送该 LCH的数据的数据部分的至少一个分量载波。
而后, 在步骤 S22中, 对各 LCH, RLC层产生与发送该 LCH的 数据部分的至少一个分量载波——对应的至少一个 RLC层数据单元, 或称 RLC PDU:
当一个 LCH的数据被完整地分配给一个分量载波时,根据 R8的 规定产生一个包括该 LCH的数据的 RLC PDU;
当一个 LCH 的数据被映射到多个分量载波上时, 产生与该多个 载波——对应的多个 RLC PDU, 其中每一个 RLC PDU包括该 LCH 的数据被分配到该分量载波的数据部分, 和该数据部分在完整的该 LCH的数据中的位置信息, 例如该数据部分在完整的该 LCH的数据 中的序列号 (例如 RLC PDU SN )。
各 RLC PDU还包括相应的 RLC PDU其他头部信息。
这样,各 LCH的数据得以映射到多个分量载波上。产生的各 RLC PDU作为本实施方式的各中间块。 RLC层将各 RLC PDU提供给 MAC 层。 RLC层也将各 RLC PDU对应于哪一个分量栽波告知 MAC层。
接着,在步骤 S23中, MAC层分别对于各个分量载波,生成 MAC 层协议单元, 或称 MAC PDU。 该 MAC PDU包括各 LCH所产生的 RLC PDU中, 在该分量载波上发送的所有 RLC PDU:
当在该分量载波上有多个 RLC PDU时, MAC PDU包括该多个 RLC PDU的合并;
当该分量载波上只有一个 RLC PDU时, MAC PDU包括该 RLC PDU。
该 MAC PDU还在例如头部中的 LCH字段中包括了各 RLC PDU 分別所属的 LCH的标识信息。 MAC层将各 MAC PDU提供给物理 ( PHY )层。
在物理层中, 发射机 Tx将与五个 MAC PDU相对应的五个传输 块 TB TB2、 TB3、 TB4和 TB5发送给接收机 Rx。 接收机 Rx的物理 层将各 MAC PDU提供给接收机 Rx的 MAC层。
在接收机 Rx的 MAC层中, 在步骤 S24里, 接收 对应于各 分量载波的各 MAC PDU。
在步骤 S23中, MAC层提取出各 MAC PDU容纳的各 RLC PDU, 并将各 RLC PDU和该 RLC PDU所属的 LCH的标识信息提供给 RLC 层。
而后, 在步骤 S26里, 分别对于各 LCH, 对于被分为多个数据部 分而在多个 RLC PDU中传输的 LCH的数据, RLC层根据各 RLC PDU 所属的该 LCH的标识信息和 RLC PDU头部中含有的该数据部分在完 整的该 LCH的数据中的位置信息, 将属于同一 LCH的各数据部分合 并为完整的该 LCH的数据。 对于没有被分为多个数据部分的 LCH的 数据, RLC层从该一个 RLC PDU中提取出其中的完整的 LCH的数 据即可。 RLC层将各完整的 LCH的数据发往高层, 进行后继的处理。
本实施方式的优点包括, RLC层以最小化各 LCH的数据被分在 多个分量载波上发送的次数为原则, 进行该 LCH 的数据到分量载波 的映射, 并产生与映射到的分量载波 对应的 RLC PDU, 相比第 一实施例来说, 减少了 LCH的数据被分为多段的情况的发生, 从而 RLC层产生的头部开销较小。 第三实施方式
本实施例在 MAC层中进行 LCH的数据到多个分量载波的映射。 在各 LCH的数据被映射到分量载波之前, 优选地, RLC层确定 各 LCH在本 ΤΉ中各自能够发送的数据量。 与第二实施方式类似地, 如图 3所示, 在步骤 S30中, RLC层计算各 LCH被进行分量载波映 射的数据量。
在一个优选的实施方式中, RLC层根据各 LCH的优先级计算各 LCH能够进行分量载波映射的数据量。
首先, 在步骤 S300中, RLC层从介质访问控制 (MAC )层获取 各载波能够提供的总的通信资源量。
而后, 在步骤 S301中, RLC层基于总的通信资源量, 依各 LCH 的优先级的次序, 分配各 LCH的待发送的最低发送数据量, 直至通 信资源量耗尽, 或各 LCH的最低发送数据量均得以分配。
若各 LCH 的最低发送数据量均得以分配, 且通信资源量还有剩 余, 则在步骤 S302中, 依各 LCH的优先级的次序, 分配各 LCH的 最低发送数据量之外的待发送数据量, 直至通信资源量耗尽, 或各 LCH的最低发送数据量之外的待发送数据量均得以分配。
在步骤 S301 , 以及步骤 S302 (如果有的话) 中得以分配的、 各 LCH 的数据量为能够进行分量载波映射从而在该 ΤΠ 中发送的数据 量。
接着, 在步骤 S31 中, RLC层按照 R8 的规定, 分别为各 LCH 产生一个 RLC PDU, 该 RLC PDU中包括完整的该 LCH的数据, 并 将各 RLC PDU提供给 MAC层。
随后, 在步骤 S32 中, MAC层根据各分量载波分别能够提供的 通信资源量, 以最小化各 LCH的数据被分在多个载波上发送的次数 为准则, 对于各 LCH, 选定分别发送该 LCH的数据的各数据部分的 一个或至少两个分量载波。
接着, 在步骤 S33中, 对于各 LCH, 当该 LCH的数据由一个分 量载波发送时, 将该 LCH的 RLC PDU本身作为一中间块; 否则, 当 该 LCH的数据由至少两个分量载波发送时, 将该 LCH的 RLC PDU 转换为与该至少两个分量载波——对应的多个中间块, 本实施方式提 供以下两种将 RLC PDU转换为多个中间块的具体方式。
方式一 MAC层使用 R8中规定的 RLC PDU子单元 (re-segmentation ) 机制进行转换。
具体的, MAC层将该 RLC PDU中的完整的该 LCH的数据划分 为与该至少两个分量载波——对应的至少两个数据部分。
并且, MAC层复制该 RLC PDU的头部, 并将头部分别与该至少 两个数据部分——合并为至少两个子单元, 其中, MAC 层设置各子 单元中的头部的子单元指示位。 同时, MAC 层还加入标识该子单元 在所有子单元中的顺序信息。 例如, 加入该子单元的第一个比特在原
RLC PDU中的偏移量, 在这种情况下之后生成的 MAC PDU的头部 中的长度指示可以用来表示该子单元的长度; 或加入该子单元在原 RLC PDU 中的第一比特或最后一比特的位置。 产生的各子单元作为 各中间块, 实现载波映射。
方式一的优点包括, 使用 R8 中已经规定的 RLC PDU 子单元 ( re-segmentation )机制实现载波映射, 不需要对标准进行较大改变。
方式二
MAC层将一个完整 RLC PDU划分为与该至少两个分量载波—— 对应的至少两个分段, 作为至少两个中间块, 实现载波映射。
对于各个分量载波, MAC 层使用对应于该分量载波的至少两个 中间块的合并或一个中间块, 生成对于该分量载波的 MAC PDU, 该 MAC PDU中包括各中间块分别所属的 LCH的标识信息。 当该 MAC PDU中包括由一个 RLC PDU划分而成的多个中间块的其中一个中间 块时, MAC PDU中应进一步包括对应于该中间块的如下信息:
■ 表明该中间块是由一个 RLC PDU划分而成的信息, 本实施 方式在 MAC PDU 头部中新建一 MSI ( MAC layer Segmentation Indication ) 字段来表示这一信息, 该字段长度为 1比特;
■ 表明该中间块在相应的完整的该 RLC PDU中的位置信息, 本实施方式在 MAC PDU头部中新建一 MSN( MAC layer Segmentation Number ) 字段, 该字段表示该中间块在完整的 RLC PDU中的序号。 在 LTE-A标准支持最多 5个分量栽波的情况下, 一个 RLC PDU最多 可能被转换为 5个中间块, 则 MSN字段的长度为 3比特时就足够分 别标示这 5个中间块的序号了。 为了减少 MAC PDU的头部开销, 该 字段仅在 MSI字段被设置的情况下存在;
■ 表明该中间块是相应的完整的该 RLC PDU的最后一个中间 块的信息, 本实施方式在 MAC PDU头部中新建一 MSE ( MAC layer Segmentation End ) 字段来表示这一信息, 该字段长度为 1 比特。 为 了减少 MAC PDU的头部开销,该字段仅在 MSI字段被设置的情况下 存在。
方式二的优点包括, 对于每个中间块, MAC PDU的头部开销最 多增加了 5个比特, 增加的开销比方式一复制整个 RLC PDU头部而 增加的开销少。 并且, 中间块在完整的 RLC PDU中的分段信息和位 置信息都插入在 MAC PDU头部中, 不直接对 RLC PDU进行修改, 这符合目 前业内广泛接受的协议层之间互不侵犯 ( inter-layer non-violation ) 的原则。
在步骤 S34中, MAC层分别对于各个分量载波, 生成 MAC层协 议单元, 或称 MAC PDU。 该 MAC PDU包括各 LCH所产生的 RLC PDU中, 在该分量载波上发送的所有 RLC PDU: 当在该分量载波上 有多个 RLC PDU时, MAC PDU包括该多个 RLC PDU的合并; 当该 分量载波上只有一个 RLC PDU时, MAC PDU包括该 RLC PDU。 该 MAC PDU还在例如头部中的 LCH字段中包括了各 RLC PDU分别所 属的 LCH的标识信息。 MAC层将各 MAC PDU提供给物理 ( PHY ) 层。
在物理层中, 发射机 Tx将与五个 MAC PDU相对应的五个传输 块 TB TB2、 TB3、 TB4和 TB5发送给接收机 Rx。 接收机 Rx的物理 层将各 MAC PDU提供给接收机 Rx的 MAC层。
在接收机 Rx的 MAC层中, 在步骤 S35里, 接收——对应于各 分量载波的各 MAC PDU。
在步骤 S36中, 接收机 Rx的 MAC层提取出各 MAC PDU中包 含的各个中间块, 根据各中间块对应的 LCH的标识信息, 将各中间 块重组为各 RLC PDU。
当中间块为一个 RLC PDU本身时, MAC层提取出该中间块即得 到了 RLC PDU。
当中间块为由 RLC PDU转换而得的时 , MAC层提取出各个这样 的中间块, 并将这些中间块转换为各个 RLC PDU。 具体的, 对于使 用以上方式一和方式二转换而得的中间块, 接收机 Rx的 MAC分別 进行如下方式的转换处理。
方式一
当中间块为 RLC PDU的子单元(re-segmentation )时, 分别对于 各 LCH, MAC层按照各子单元在所有子单元中的顺序信息, 将各子 单元的数据部分重组为完整的该 LCH的数据, 且生成一 RLC PDU, 并将该头部与完整的该 LCH的数据合并为该 RLC PDU。
方式
当中间块为 RLC PDU的分段时, MAC层根据 MAC PDU头部中 包含的根据各分段在其所属的 RLC PDU中的位置信息, 将各分段合 并为各完整的 RLC PDU。
MAC层在重组得到各个 RLC PDU后, 将各 RLC PDU发给 RLC 层, 进行后继的处理。
本实施方式的优点是, 只需要 MAC层对载波汇聚进行适应性的 调整, 使用 RLC PDU进行载波映射; 而 RLC层仍然根据 R8中的规 定为每一个 LCH产生一个 RLC PDU, 不需要进行任何改变。 尽管在附图和前述的描述中详细阐明和描述了本发明, 应认为该 阐明和描述是说明性的和示例性的, 而不是限制性的; 本发明不限于 所上述实施方式。
那些本技术领域的一般技术人员可以通过研究说明书、 公开的内 容及附图和所附的权利要求书, 理解和实施对披露的实施方式的其他 改变。 在权利要求中, 措词 "包括" 不排除其他的元素和步骤, 并且 措辞 "一个" 不排除复数。 在发明的实际应用中, 一个零件可能执行 权利要求中所引用的多个技术特征的功能。权利要求中的任何附图标 记不应理解为对范围的限制。

Claims

权 利 要 求 书
1. 一种基于多载波发送数据的方法, 其中, 包括如下步骤: - 在预定协议层中, 分别对于各逻辑信道, 产生分别在至少一个 载波上发送的至少一个中间块, 该至少一个中间块一"^■包括在各载波 上发送的各逻辑信道的数据的各数据部分;
- 在介质访问控制层中, 分别对于各个栽波, 生成介质访问控制 层协议单元, 该协议单元包含在该载波上发送的各中间块和各中间块 分别所属的逻辑信道的标识信息。
2. 根据权利要求 1所述的方法, 其特征在于, 所述预定协议层为 无线链路控制层。
3. 根据权利要求 2所述的方法,其特征在于,所述产生步骤包括: - 从介质访问控制层获取各载波分别提供的通信资源量;
- 依次使用各载波进行如下步骤:
按照该载波的通信资源量,根据各逻辑信道的优先级次序, 将各逻辑信道的待发送的最低发送数据量中没有得到分配的数 据分配在该载波上发送, 当该载波的通信资源量耗尽时, 使用 下一载波重复本步骤, 当所有载波的通信资源量都耗尽时, 结 束本步骤, 当各逻辑信道的最低发送数据量均得以分配, 且还 存在通信资源量没有耗尽的的载波时, 依次使用该些载波进行 如下子步骤:
按照该载波没有耗尽的通信资源量, 根据各逻辑信道的 优先级次序,将各逻辑信道的待发送的最低发送数据量以外 的数据中没有得到分配的数据分配在该载波上发送, 当该载 波的通信资源量耗尽时, 使用下一载波重复本子步驟, 直至 所有载波的通信资源量耗尽,或各逻辑信道的待发送数据量 均得以分配;
- 对于各逻辑信道, 产生与该逻辑信道的数据的被分配到的至少 一个分量载波一一对应的至少一个无线链路控制层数据单元,作为所 述中间块, 各数据单元包括该逻辑信道的数据被分配到该载波的数据 部分, 当该逻辑信道的数据被分配到多个分量载波时, 各数据单元还 包括该数据部分在完整的该逻辑信道的数据中的位置信息;
所述生成步骤分别对于各个载波, 使用至少一个逻辑信道的、 对 应于该载波的数据单元的合并, 生成协议单元。
4. 根据权利要求 2所述的方法, 其特征在于, 所述产生步骤进一 步包括如下步骤:
- 从介质访问控制层获取各载波分别能够提供的通信资源量; - 根据各载波分别能够提供的通信资源量, 对各逻辑信道, 基于 一定准则, 分别选定发送该逻辑信道的数据的数据部分的至少一个载 波, 其中, 该一定准则为最小化各逻辑信道的数据被分在多个载波上 发送的次数;
- 对各逻辑信道, 产生与发送该逻辑信道的数据部分的至少一个 载波——对应的至少一个无线链路控制层数据单元, 作为所述中间 块, 该数据单元包括该逻辑信道的数据被分配到该载波发送的数据部 分, 当该逻辑信道的数据被分配到多个载波时, 各数据单元还包括该 数据部分在完整的该逻辑信道的数据中的位置信息;
所述生成步骤分别对于各个载波, 使用对应于该载波的至少两个 数据单元的合并或一个数据单元, 生成对于该载波的协议单元。
5. 根据权利要求 1所述的方法, 其特征在于, 所述预定协议层为 介质访问控制层,在所述产生步骤之前,该方法进一步包括如下步骤:
- 在无线链路控制层中, 分别对于各个逻辑信道, 产生一数据单 元, 该数据单元中包括完整的该逻辑信道的数据, 并将产生的各数据 单元提供给介质访问控制层。
6. 根据权利要求 5所述的方法, 其特征在于, 分别对于各数据单 元, 所述产生步骤进一步包括如下步骤:
- 根据各载波分别能够提供的通信资源量, 基于一定准则, 选定 分别发送该逻辑信道的数据的各数据部分的一个或至少两个载波, 该 一定准则为最小化各逻辑信道的数据被分在多个载波上发送的次数; - 当该逻辑信道的数据由至少两个载波发送时, 将该数据单元转 换为所述中间块, 否则将该数据单元作为所述中间块本身;
分别对于各个载波, 所述生成步骤使用对应于该载波的至少两个 中间块的合并或一个中间块, 生成对于该载波的协议单元。
7. 根据权利要求 6所述的方法, 其特征在于, 所述转换步骤为:
- 将该数据单元中的该逻辑信道的数据划分为与该至少两个载波 ——对应的至少两个数据部分;
- 复制该数据单元的头部信息, 并将头部信息分别与该至少两个 数据部分——合并为至少两个子单元, 作为所述中间块, 各子单元的 头部信息中加入了标识该子单元在所有子单元中的顺序信息。
8. 根据权利要求 6所述的方法, 其特征在于, 所述转换步骤为:
- 将完整的该数据单元划分为与该至少两个载波——对应的至少 两个分段, 作为所述中间块;
所述生成步骤中, 协议单元包括:
指示所包含的中间块是否是数据单元的分段的信息; 以及, 数据单元的分段在所属的数据单元中的位置信息。
9. 根据权利要求 1所述的方法, 其特征在于, 在所述产生步骤之 前, 该方法还包括如下步骤:
- 在无线链路控制层中, 计算各逻辑信道能够在所述产生步骤中 被使用的数据量。
10. 根据权利要求 9所述的方法, 其特征在于, 所述计算步驟包 括:
- 从介质访问控制层获取各载波能够提供的总的通信资源量; - 基于总的通信资源量, 依各逻辑信道的优先级的次序, 分配各 逻辑信道的待发送的最低发送数据量, 直至通信资源量耗尽, 或各逻 辑信道的最低发送数据量均得以分配;
- 若各逻辑信道的最低发送数据量均得以分配, 且通信资源量还 有剩余, 则依各逻辑信道的优先级的次序, 分配各逻辑信道的最低发 送数据量之外的待发送数据量, 直至通信资源量耗尽, 或各逻辑信道 的待发送数据量均得以分配;
各逻辑信道的、 得以分配的数据量为能够在所述产生步骤中被使 用的数据量。
11. 一种基于多载波接收数据的方法, 其中, 包括如下步骤:
- 在介质访问控制层中, 接收——对应于各载波的各介质访问控 制层协议单元, 该协议单元包含在该载波上发送的至少一个逻辑信道 的中间块和该中间块所属的逻辑信道的标识信息, 各中间块分别包括 在一载波上发送的一逻辑信道的数据的一数据部分;
- 在预定协议层中, 分别对于各逻辑信道, 根据各中间块所属的 逻辑信道的标识信息, 将该逻辑信道的各中间块重组, 以获得完整的 该逻辑信道的数据。
12. 根据权利要求 11所述的方法, 其特征在于, 所述预定协议层 是无线链路控制层, 所述中间块为无线链路控制层数据单元, 所述数 据单元包括一逻辑信道的数据被分配到该载波的数据部分, 当该数据 部分是该逻辑信道的数据的多个数据部分中的一个时, 该数据单元还 包括该数据部分在完整的该逻辑信道的数据中的位置信息;
在所述重组步骤之前, 在所述介质访问层中, 提取出各协议单元 容纳的各数据单元, 并将各数据单元和该数据单元所属的逻辑信道的 标识信息提供给无线链路控制层;
所述重组步骤根据各数据单元所属的逻辑信道的标识信息和数据 单元中的数据部分在完整的该逻辑信道的数据中的位置信息, 将属于 同一逻辑信道的各数据部分合并为完整的该逻辑信道的数据。
13. 根据权利要求 11所述的方法, 其特征在于, 所述预定协议层 是介质访问控制层, 当该逻辑信道的数据由至少两个载波发送时, 所 述中间块由逻辑信道的数据的无线链路控制层数据单元转换而得的 至少两个中间块中的一个, 否则, 所述中间块为将该数据单元本身, 所述协议单元包括在该载波上发送的一中间块, 或至少两个中间块的 合并; 所述重组步骤在所述介质访问层中, 提取出各协议单元中包含的 各个中间块, 并当中间块是由数据单元转换而得时, 将中间块转换为 各数据单元。
14. 根据权利要求 13所述的方法, 其特征在于, 由数据单元转换 而得的中间块为数据单元的子单元, 子单元包括完整的该逻辑信道的 数据的一数据部分和无线链路控制层头部信息, 所述头部信息中包括 该子单元在该逻辑信道的数据的所有子单元中的顺序信息;
在所述介盾访问层中, 所述转换步骤为, 分别对于各逻辑信道, 按照各子单元在所有子单元中的顺序信息, 将各数据部分重组为完整 的该逻辑信道的数据, 且生成一无线链路控制层头部, 并将该头部与 完整的该逻辑信道的数据合并为该数据单元。
15. 根据权利要求 13所述的方法, 其特征在于, 由数据单元转换 而得的中间块为数据单元的分段, 所述协议单元包括:
指示所包含的中间块是否是数据单元的分段的信息; 以及, 数据单元的分段在所属的数据单元中的位置信息;
在所述介质访问层中, 所述转换步驟为, 根据各分段在其所属的 数据单元中的位置信息, 将各分段合并为各完整的数据单元。
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