WO2013026290A1 - Procédé et système de transmission à dérivation rlc - Google Patents

Procédé et système de transmission à dérivation rlc Download PDF

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Publication number
WO2013026290A1
WO2013026290A1 PCT/CN2012/075042 CN2012075042W WO2013026290A1 WO 2013026290 A1 WO2013026290 A1 WO 2013026290A1 CN 2012075042 W CN2012075042 W CN 2012075042W WO 2013026290 A1 WO2013026290 A1 WO 2013026290A1
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data
rlc
module
sent
pdcp
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PCT/CN2012/075042
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English (en)
Chinese (zh)
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黄侃
杨立
吕应权
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中兴通讯股份有限公司
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Publication of WO2013026290A1 publication Critical patent/WO2013026290A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W92/00—Interfaces specially adapted for wireless communication networks
    • H04W92/04—Interfaces between hierarchically different network devices
    • H04W92/045—Interfaces between hierarchically different network devices between access point and backbone network device

Definitions

  • the present invention relates to digital mobile communication technologies, and in particular, to a radio link layer (RLC) offload transmission method and system.
  • RLC radio link layer
  • a Universal Terrestrial Radio Access Network In a Wideband Code Division Multiple Access (WCDMA) network, a Universal Terrestrial Radio Access Network (UTRAN) includes a Radio Network Controller (RNC) and a Base Station (NodeB). Two basic network elements, commonly known as 3G networks.
  • RNC Radio Network Controller
  • NodeB Base Station
  • LTE Long Time Evolution
  • the Evolved Universal Terrestrial Radio Access Network E-UTRAN includes an evolved base station eNodeB (eNB), a basic network element, commonly known as a 4G network.
  • eNB evolved base station
  • High-speed downlink receive link packet access HSDPA, High Speed Downlink Packet Access
  • high-speed uplink link packet access HSUPA, High Speed Uplink Packet Access
  • dual-carrier high-speed downlink packet access Dual-band high-speed downlink packet access (DB-DC-HSDPA), dual-carrier high-speed downlink packet access (DB-DC-HSDPA)
  • DC-HSUPA Dual Carrier-high speed uplink packet access
  • 4C-HSDPA four carrier-high speed downlink packet access
  • 8C-HSDPA Eight-carrier high-speed downlink packet access
  • the multi-carrier aggregation technologies in these 3G systems are introduced one after another, so that the uplink and downlink data transmission rates of user equipments (UEs) are continuously doubled.
  • the UE must be equipped with multiple 3G-related receiving data processing.
  • a chain (3G- Receiver Chain) can simultaneously receive 3G data blocks sent from uplink and downlink of several carriers from the same sector of the same base station.
  • the WCDMA system that has evolved to today is also known as HSPA + System (High Speed Packet Access+).
  • the CA carrier aggregation
  • the LTE system can aggregate five carriers with a downlink bandwidth of 20 MHz.
  • An important basic feature is that the UE must be equipped with multiple 4G-related Receiver Chains (4G-Receiver Chains), which can simultaneously receive and process several carriers from the same base station and send them to the uplink and downlink. 4G data block.
  • FIG. 1 a prototype architecture of the 7G technology is shown in FIG. 1 , where the base station eNB of the LTE is used as the primary control anchor and the data offload control point of the terminal RRC (Radio Resource Connection) connection, and FIG. 1 is taken as an example, the UE is in the eNB.
  • scheduling commands such as resource allocation and HARQ operation related information
  • PDCCH channel Physical Downlink Control Channel
  • PDSCH Physical Downlink Shared Channel
  • the UE is controlled by the scheduling command of the HS-SCCH High Speed Shared Control Channel on a working carrier of the NodeB.
  • the anchor eNB is responsible for allocating upper layer protocol packets generated by the eNB, and in a certain manner, determining which part is transmitted from the LTE air interface, and which part is transmitted from the HSPA+ air interface.
  • the protocol packet allocated to the NodeB needs to be transmitted through a new interface between the eNB and the NodeB, and the NodeB transmits according to the characteristics of the protocol and the HSPA + air interface.
  • the UE sends a PUCCH channel (Physical Uplink Control Channel) at least on the uplink frequency point paired with the eNB working downlink frequency point, which includes, for example: HARQ operation related (correct reception acknowledgement ACK/NACK) ), scheduling request, receiving channel quality indication, etc., to feed back the necessary information related to LTE downlink high speed data transmission.
  • HARQ operation related correct reception acknowledgement ACK/NACK
  • HS-DPCCH channel High Speed-Dedicated Physical Control channel
  • the UE tends to perform single-system uplink feedback only on the LTE air interface instead of simultaneous feedback across the system.
  • HSPA + Radio Network Controller acts as the primary control anchor and data offload control point for the terminal RRC (Radio Resource Connection) connection
  • RRC Radio Resource Connection
  • the UE receives a part of user data from the HS-DSCH channel (High Speed-Downlink Shared channel) under the control command of the HS-SCCH High Speed Shared Control Channel on a working carrier of the NodeB.
  • scheduling commands such as resource allocation and HARQ operation related information
  • PDCCH channel Physical Downlink Control Channel
  • PDSCH channel Physical Downlink Shared Channel
  • the anchor RNC is responsible for allocating the data packets generated by the upper layer protocol, and in a certain way, deciding which part to send from the air interface of LTE, which part is from the air of HSPA + The interface sends.
  • the protocol packet allocated to the part of the eNB needs to be transmitted through a new interface between the RNC and the eNB, and is transmitted by the eNB according to its own protocol characteristics and the LTE air interface.
  • the UE In the uplink direction (from the UE to the base station), the UE sends the HS-DPCCH channel (High Speed-Dedicated Physical Control channel) at least on the uplink frequency point of the NodeB working downlink frequency point pair to feed back the HSPA+ downlink high-speed data transmission. Necessary information. Whether the UE needs to transmit a PUCCH channel (Physical Uplink Control Channel) on the uplink frequency point paired with the eNB working downlink frequency point is currently under study. Generally, in order to reduce the uplink transmit power of the UE and reduce the uplink interference, the UE tends to The UE performs single-system uplink feedback only on the HSPA+ air interface instead of simultaneous feedback across the system.
  • HS-DPCCH channel High Speed-Dedicated Physical Control channel
  • the UE may perform data reception on M carriers of HSPA+, and perform data reception on N carriers of LTE at the same time.
  • the basic principle of operation is the same as above, and it is possible to expand to a higher dimension.
  • 3G and 4G systems can share different types of services (such as voice as much as possible in the HSPA + system CS domain, high-speed data services as far as possible in the LTE system), or can simultaneously undertake the same services (eg, data services are assigned to both systems simultaneously) transmission).
  • the 3G and 4G systems will affect the serial number of the radio link layer (RCC) data received by the UE due to the difference in air interface capability and the air interface environment quality. If the traditional RLC module is used and the serial number is filled in, it will inevitably lead to a large number of RLC out-of-order and retransmissions, affecting the actual downlink data throughput rate of the UE, which will greatly reduce the downlink rate and efficiency of the carrier aggregation scenario.
  • the 4G RLC There are some differences between the layer and the 3G RLC layer mechanism (for example, 4G RLC supports re-segmentation), so a common RLC module is in place. It will be more complicated. Summary of the invention
  • the main purpose of the present invention is to provide an RLC offload transmission method and system, which can improve the downlink data throughput of the UE and improve the downlink rate and efficiency of the carrier aggregation scenario.
  • a radio link layer RLC offload transmission method includes:
  • the packet data convergence protocol of the primary anchor point The PDCP module schedules the data to be sent, and transmits the data to be sent to the 3G RLC module and/or the 4G RLC module for processing;
  • the 3G RLC module and the 4G RLC module respectively perform independent data processing through different RLC modules, and send the processed data to the base station NodeB and the evolved base station eNB respectively; the eNB and the NodeB respectively receive the 4G RLC module and the 3G RLC module.
  • the data is sent to the user equipment UE.
  • the primary anchor point is an eNB or a radio network controller RNC.
  • the 3G RLC module sends the processed data to the NodeB as follows: The 3G RLC module sends the processed data to the NodeB through the HSDPA FP module;
  • the 4G RLC module sends the processed data to the eNB: when the primary anchor point is the eNB, the 4G RLC module sends the processed data to the eNB through the internal interface of the device; when the primary anchor point is the RNC, the 4G RLC module passes the X2.
  • the interface sends the processed data to the eNB.
  • the PDCP module of the primary anchor performs scheduling on the data to be sent according to the data sending capability of the 3G RLC module, the data sending capability of the 4G RLC module, and the amount of data buffered from the core network, specifically:
  • the PDCP buffer receives the data sent by the core network and starts scheduling.
  • N data is obtained from the PDCP buffer and sent to the 3G RLC module.
  • the PDCP module of the primary anchor performs scheduling on the data to be sent according to: the data sending capability of the 3G RLC module, the data sending capability of the 4G RLC module, and the amount and priority of the cached data from the core network. Specifically:
  • the PDCP buffer receives the data sent by the core network and starts scheduling.
  • the 4G air interface transmit capability and the amount of buffered data in the 4G RLC buffer that has not yet been sent data, and calculate the amount of data that the 4G RLC can also send;
  • the 3G air interface transmit capability and the amount of buffered data in the 3G RLC buffer that has not yet been sent data, and calculate the amount of data that the 3G RLC can also send;
  • the data packet is delivered to the corresponding RLC instance, and the next packet is processed until all PDCP data packets are processed, or both RLCs are unable to process the data, and the process ends.
  • the PDCP module of the primary anchor schedules the data to be sent as follows: According to the port number of the data packet and the unbalanced state of the 3G RLC module and the 4G RLC module, the scheduling is as follows:
  • An RLC offload transmission system includes: a primary anchor point, an eNB, and a NodeB.
  • the primary anchor point specifically includes: a PDCP module, a 3G RLC module, and a 4G RLC module.
  • the PDCP module is configured to schedule data to be sent, and transmit the data to be sent to the 3G RLC module and/or the 4G RLC module for processing;
  • the 3G RLC module is configured to process data from the PDCP module, and send the processed data to the NodeB;
  • the 4G RLC module is configured to process data from the PDCP module, and send the processed data to the eNB;
  • the eNB is configured to send the data from the 4G RLC module to the UE;
  • the NodeB is configured to send the data from the 3G RLC module to the UE.
  • the primary anchor point is an eNB or an RNC.
  • the primary anchor point further includes an HSDPA FP module, and the 3G RLC module sends the processed data to the NodeB: the 3G RLC module sends the processed data to the NodeB through the HSDPA FP module;
  • the 4G RLC module sends the processed data to the eNB: when the primary anchor point is the eNB, the 4G RLC module sends the processed data to the eNB through the internal interface of the device; when the primary anchor point is the RNC, the 4G RLC module passes the X2.
  • the interface sends the processed data to the eNB.
  • the PDCP module schedules data to be sent as:
  • the scheduling is as follows:
  • the PDCP buffer receives the data sent by the core network and starts scheduling.
  • N data is obtained from the PDCP buffer and sent to the 3G RLC module.
  • the PDCP module of the primary anchor performs scheduling on the data to be sent according to: the data sending capability of the 3G RLC module, the data sending capability of the 4G RLC module, and the amount and priority of the cached data from the core network. Specifically:
  • the PDCP buffer receives the data sent by the core network and starts scheduling.
  • the 4G air interface transmit capability and the amount of buffered data in the 4G RLC buffer that has not yet been sent data, and calculate the amount of data that the 4G RLC can also send;
  • the 3G air interface transmit capability and the amount of buffered data in the 3G RLC buffer that has not yet been sent data, and calculate the amount of data that the 3G RLC can also send;
  • the data packet is delivered to the corresponding RLC instance, and the next packet is processed until all PDCP data packets are processed, or both RLCs are unable to process the data, and the process ends.
  • the PDCP module of the primary anchor schedules the data to be sent as follows: According to the port number of the data packet and the unbalanced state of the 3G RLC module and the 4G RLC module, the scheduling is as follows:
  • the port number of the TCP protocol cannot be detected, it will be put into the 4G RLC module uniformly. If the TCP protocol can be detected, if a new port number appears, the corresponding data packet will be placed in the 4G RLC module and 3G RLC. Module, if there is a duplicate port number, the corresponding data packet is placed in the corresponding 4G RLC module or 3G RLC module that has been allocated before; the same imbalance state is detected in the preset scheduling period, and the data is entered. Flow correction.
  • the PDCP module of the main anchor point needs The transmitted data is scheduled, and the data to be sent is transmitted to the 3G RLC module and/or the 4G RLC module for processing; the 3G RLC module and the 4G RLC module respectively perform independent data processing through different RLC modules, and the processed data is processed.
  • the eNB and the NodeB respectively send data from the 4G RLC module and the 3G RLC module to the UE.
  • the embodiment of the present invention uses two independent RLC streams to transmit downlink data, so that the downlink data throughput of the UE can be improved, and the downlink rate and efficiency of the carrier aggregation scenario can be improved.
  • Figure 1 is a schematic diagram of a prototype structure of the existing 7G technology
  • Figure 2 is a schematic diagram of another prototype structure of the existing 7G technology
  • FIG. 3 is a schematic flowchart of a RLC offload transmission method according to an embodiment of the present invention.
  • FIG. 4 is a schematic structural diagram of an RLC offload transmission system according to an embodiment of the present invention.
  • FIG. 5 is a schematic structural diagram of an RLC offload transmission system according to an embodiment of the present invention.
  • FIG. 6 is a schematic structural diagram of an RLC shunt transmission system according to an embodiment of the present invention when the main anchor point is an RNC;
  • FIG. 7 is a schematic flowchart of a RLC offload transmission method according to Embodiment 1 of the present invention
  • FIG. 8 is a schematic flowchart of a RLC offload transmission method according to Embodiment 2 of the present invention
  • the basic idea of the embodiment of the present invention is:
  • the PDCP module of the primary anchor station schedules the data to be sent, and transmits the data to be sent to the 3G RLC module and/or the 4G RLC module for processing; the 3G RLC module and the 4G RLC module respectively Independent data processing is performed by different RLC modules, and the processed data is separately sent to the NodeB and the eNB; the eNB and the NodeB respectively send data from the 4G RLC module and the 3G RLC module to the UE. Since each packet of the RLC layer has a sequence number, it needs to be delivered and fed back in order. Therefore, in the carrier aggregation scenario, two independent RLC modules are needed for transmission. Therefore, how to allocate data to these two independent The RLC data stream becomes the upper layer of the RLC, which is the problem to be considered in the Packet Data Convergence Protocol (PDCP) layer.
  • PDCP Packet Data Convergence Protocol
  • two independent RLC modules need to be established.
  • two independent RLC streams need to be fed back, and in the downlink direction, after the RLC reorganization is completed for the received data. Then you can deliver it as soon as possible.
  • the embodiments of the present invention mainly relate to how to implement simultaneous aggregation of 3G carriers and 4G carriers in the form of a single control node in the two wireless communication systems of 3G WCDMA and 4G LTE.
  • the present invention can be used as the primary anchor point or the RNC as the primary anchor point.
  • the embodiment of the present invention mainly uses the eNB as the primary anchor point.
  • FIG. 3 is a schematic flowchart of an RLC offload transmission method according to an embodiment of the present invention. As shown in FIG. 3, the method includes:
  • Step 301 The PDCP module of the primary anchor schedules the data to be sent, and transmits the data to be sent to the 3G RLC module and/or the 4G RLC module for processing.
  • the primary anchor point is an eNB or an RNC, which can be scheduled according to the data transmission capability of the 3G RLC module, the data transmission capability of the 4G RLC module, and the amount of data buffered from the core network; or according to the data of the 3G RLC module.
  • the sending capability, the data sending capability of the 4G RLC module, and the amount and priority of the cached data from the core network are scheduled; the scheduling can also be based on the port number of the packet and the imbalance of the 3G RLC module and the 4G RLC module. .
  • Step 302 The 3G RLC module and the 4G RLC module respectively perform independent data processing through different RLC modules, and send the processed data to the NodeB and the eNB respectively.
  • the 3G RLC module needs to encapsulate the data into the frame format of the 3G HSDPA FP, and send it to the 3G NodeB.
  • the primary anchor point is the eNB
  • 4G RLC After the module processes the data, the processed data is sent to the eNB through the internal interface of the device.
  • the primary anchor point is the RNC
  • the 4G RLC module processes the data, the data is sent through the X2 interface.
  • Step 303 The eNB and the NodeB respectively will come from the 4G.
  • the data of the RLC module and the 3G RLC module is sent to the UE.
  • FIG. 4 is a schematic structural diagram of an RLC offload transmission system according to the present invention. As shown in FIG. 4, the system includes a primary anchor point, an eNB, and a NodeB. Points include: PDCP module, 3G RLC module and 4G RLC module.
  • the PDCP module is configured to schedule data to be sent, and transmit the data to be sent to the 3G RLC module and/or the 4G RLC module for processing;
  • the 3G RLC module is configured to process data from the PDCP module, and send the processed data to the NodeB;
  • the 4G RLC module is configured to process data from the PDCP module, and send the processed data to the eNB;
  • the eNB is configured to send the data from the 4G RLC module to the UE;
  • the NodeB is configured to send the data from the 3G RLC module to the UE.
  • the primary anchor point further includes an HSDPA FP module, and the 3G RLC module sends the processed data to the NodeB: the 3G RLC module sends the processed data to the NodeB through the HSDPA FP module;
  • the 4G RLC module sends the processed data to the eNB: when the primary anchor point is the eNB, the 4G RLC module sends the processed data to the eNB through the internal interface of the device; when the primary anchor point is the RNC, the 4G RLC module passes the X2.
  • the interface sends the processed data to the eNB.
  • the PDCP module schedules data to be sent as:
  • the PDCP buffer receives the data sent by the core network and starts scheduling.
  • N data is obtained from the PDCP buffer and sent to the 3G RLC module.
  • the PDCP module of the primary anchor performs scheduling on the data to be sent according to: the data sending capability of the 3G RLC module, the data sending capability of the 4G RLC module, and the amount and priority of the cached data from the core network. Specifically:
  • the PDCP buffer receives the data sent by the core network and starts scheduling.
  • the 4G air interface transmit capability and the amount of buffered data in the 4G RLC buffer that has not yet been sent data, and calculate the amount of data that the 4G RLC can also send;
  • the 3G air interface transmit capability and the amount of buffered data in the 3G RLC buffer that has not yet been sent data, and calculate the amount of data that the 3G RLC can also send;
  • the data packet is delivered to the corresponding RLC instance, and the next packet is processed until all PDCP data packets are processed, or both RLCs are unable to process the data, and the process ends.
  • the PDCP module of the primary anchor schedules the data to be sent as follows: According to the port number of the data packet and the unbalanced state of the 3G RLC module and the 4G RLC module, the scheduling is specifically as follows: If the port number of the TCP protocol cannot be detected, it will be put into the 4G RLC module uniformly. If the TCP protocol can be detected, if a new port number appears, the corresponding data packet will be placed in the 4G RLC module and 3G RLC. Module, if there is a duplicate port number, the corresponding data packet is placed in the corresponding 4G RLC module or 3G RLC module that has been allocated before; the same imbalance state is detected in the preset scheduling period, and the data is entered. Flow correction.
  • the eNB includes: a PDCP module, a 3G RLC module, an HSDPA FP module, a 4G RLC module, a MAC module, and a NodeB. Specifically, it includes: HSDPA FP module and MAC-EHS module. It can be seen that compared with the existing structure, the structure mainly adds a 3G RLC module and an HSDPA FP module under the 4G eNB, and the eNB's 4G RLC module processes the data. After that, the eNB's 4G MAC (Media Access Layer) is called to send data to the UE.
  • a PDCP module As shown in FIG. 5, the eNB includes: a PDCP module, a 3G RLC module, an HSDPA FP module, a 4G RLC module, a MAC module, and a NodeB.
  • HSDPA FP module and MAC-EHS module.
  • the data needs to be encapsulated into a 3G HSDPA FP frame format and sent to the 3G NodeB.
  • the data is then sent by the 3G NodeB to the UE via the 3G MAC-EHS (Enhanced High Speed Media Access Layer).
  • 3G MAC-EHS Enhanced High Speed Media Access Layer
  • FIG. 6 a detailed structure diagram of an RLC shunt transmission system according to an embodiment of the present invention is shown in FIG. 6. The processing flow is similar to that of FIG. 5 and will not be described in detail herein.
  • the processing apparatus of the present invention mainly includes the following two stages of processing:
  • the PDCP layer classifies and schedules data, sends it to different RLC modules for processing, and dynamically adjusts based on real-time information.
  • the 4G and 3G RLC perform independent data processing, and send the processed data to the 4G and 3G MAC layers for transmission.
  • data scheduling is performed according to the principle of first-come-first-served capability allocation.
  • First-come-first-served capacity allocation is one of the most common methods of diversion. Because the 4G air interface can be sent The feedback speed of the sending capability is higher than 3G (4G is lms, 3G is 2ms), so when the PDCP layer receives the data, first check the 4G air interface transmitability and the amount of data that has not been sent in the 4G RLC module, their difference This is the amount of data that can be sent by this scheduling. The data corresponding to this part of the data is sent to the 4G RLC, and then the 3G air interface transmit capability and the 3G RLC module have not yet sent the data amount, their difference. The value is the amount of data that can be sent by the scheduled 3G, and this part of the data is sent to the RLC module corresponding to the 3G for processing.
  • FIG. 7 is a schematic flowchart of a RLC offload transmission method according to Embodiment 1 of the present invention. As shown in FIG. 7, the specific implementation steps of Embodiment 1 of the present invention are as follows:
  • Step 701 The PDCP buffer receives the data sent by the core network, and starts scheduling.
  • Step 702 Query the air interface transmittable capability of the 4G RLC (corresponding to the amount of data that can be sent), and the amount of buffered data of the 4G RLC buffer that has not yet been sent data, and the two are subtracted after the conversion, and the amount of data that can be currently sent is obtained. , that is, the number M of data packets to be sent to the 4G RLC module in this scheduling period.
  • Step 703 Obtain M data from the PDCP buffer and send the data to the 4G RLC module.
  • Step 705 Obtain N data from the PDCP buffer and send it to the 3G RLC module.
  • Step 706 The 4G RLC module and the 3G RLC module respectively perform data processing according to the mechanism thereof, wherein the 3G RLC needs to send the processed data according to the frame format of the HSDPA FP.
  • the advantage of this method is that it can maximize the bandwidth of the 4G and 3G air interface transmission, 4G and 3G do not interfere with each other, and the independent RLC module can ensure the sequential transmission of data.
  • Example 2 This embodiment performs data distribution according to a TCP connection or a unified attribute.
  • the transmission of the unresolved priority may cause the out-of-order of the TCP layer data. Therefore, in this embodiment, the PDCP performs data allocation according to certain rules, such as the service type priority, to compensate for this problem.
  • certain rules such as the service type priority
  • packets of the same TCP stream have some of the same attributes, so we can assign packets to different RLC modules based on this.
  • the service type with high priority data or large traffic can be delivered in the 4G RLC, and the low priority data or traffic is relatively low.
  • the service can be delivered on the 3G RLC.
  • a corresponding TCP connection data usually belongs to the same service type or priority, so the order of the TCP connection data can be guaranteed.
  • FIG. 8 is a schematic flowchart of a method for transmitting an RLC offloading according to Embodiment 2 of the present invention. As shown in FIG. 8, the specific implementation steps of Embodiment 2 of the present invention are as follows:
  • Step 801 The PDCP buffer receives the data sent by the core network, and starts scheduling.
  • Step 802 Query the air interface transmittable capability of the 4G RLC (corresponding to the amount of data that can be sent), and the amount of buffered data of the 4G RLC buffer that has not yet been sent data, and subtract the two to obtain the amount of data that can be sent by the 4G RLC. MB.
  • Step 803 Query the air interface transmit capability of the 3G (corresponding to the amount of data that can be sent), and the buffered data amount of the data that has not been sent in the buffer of the 3G RLC, and subtract the two to obtain the data volume NB that can be sent by the 3G RLC. .
  • Step 804 Determine whether the PDCP buffer has unprocessed data. If there is still unprocessed data, obtain a data packet from the PDCP buffer, and go to step 805; otherwise, the technology is scheduled.
  • Step 805 Determine whether the data meets the 4G RLC processing standard, and if yes, go to step 806; otherwise, go to step 807.
  • Step 806 Determine whether the 4G RLC processing data exceeds the MB, and if yes, end the current round of scheduling; otherwise, go to step 808.
  • Step 807 Determine whether the 3G RLC processing data exceeds NB, and if yes, end the current round of scheduling; otherwise, go to step 809.
  • Step 808 The data is put into the 4G RLC module for processing.
  • Step 809 The data is put into the 3G RLC module for processing.
  • the core network support is required to distinguish the TOS field.
  • the amount of data of the FTP service is generally large, and can be sent in 4G, and the amount of HTTP service data is relatively low, and can be sent in 3G;
  • the out-of-order problem of the TCP layer can be solved, and the order of each TCP connection data is guaranteed, and only the 4G air interface or the 3G air interface is transmitted.
  • This embodiment relates to a hybrid dynamic allocation method.
  • TCP connection if it is a download, one thread corresponds to one.
  • TCP connection if it is Internet access, a web page will also correspond to many TCP connections. Therefore, the polling method can be used.
  • RLC if it can detect the TCP protocol, it will be assigned in turn, and the packets of the same port number will be sent to the 4G RLC and 3G RLC modules in turn. For example, the TCP port number of the first PDCP packet is 500.
  • the data volume of the two streams can be guaranteed to be substantially uniform, but there may be cases where the data that one RLC module can transmit is not full, and the data of another RLC module cannot be sent. This can be corrected for this situation.
  • the 4G RLC module has the capacity to deliver, and the data volume of the 3G RLC module is large, the transmission is not complete, and the status is recorded as "unbalance 4", indicating that 4G is idle, otherwise it is recorded as "unbalanced”.
  • 3 means that 3G is idle.
  • the counter threshold can be set.
  • Unbalanced 4" or “unbalanced 3" state is detected in consecutive BN (Balance Num, BN can be 10) scheduling periods, then "continuous” is entered.
  • Unbalanced 4" "continuous unbalance 3" initiates the correction.
  • the correction method is as follows, taking "continuous unbalance 4" as an example: The next PDCP packet, if it is a packet that has not been seen before, still follows the original rotation Guidelines for delivery;
  • the next PDCP packet if it is to be placed in the 3G RLC, is placed in the 4G RLC, and the record is updated, and the PDCP data of the port number is changed to 4G RLC;
  • the next PDCP packet if it is to be placed in the 4G RLC, remains unchanged.
  • FIG. 9 is a schematic flowchart of a method for transmitting an RLC offloading according to Embodiment 3 of the present invention. As shown in FIG. 9, the specific implementation steps of Embodiment 3 of the present invention are as follows:
  • Step 901 The PDCP buffer receives the data sent by the core network, and starts scheduling.
  • Step 902 Query the air interface transmittable capability of the 4G RLC (corresponding to the amount of data that can be sent), and the amount of buffered data of the 4G RLC buffer that has not yet been sent data, and subtract the amount of data that can be sent by the 4G RLC.
  • Step 903 Query the air interface transmit capability of the 3G (corresponding to the amount of data that can be sent), and the buffer amount of the data that has not been sent in the buffer of the 3G RLC, and subtract the data amount NC that can be sent by the 3G RLC.
  • Step 904 Determine whether there is still unprocessed data in the PDCP buffer. If yes, go to step 905; otherwise, end the current round of scheduling.
  • Step 905 Obtain a data packet from the PDCP buffer to determine whether the TCP port number can be detected. If yes, go to step 906; otherwise, go to step 911. .
  • Step 906 According to the TCP port number filtering, the newly added port number is placed in the 4G or 3G RLC in turn, and the old port number is placed in the RLC module that was last placed until the amount of data that can be sent is sent.
  • Step 907 Detect whether an imbalance condition occurs, and if yes, go to step 908; otherwise, return to step 904.
  • Step 908 The imbalance state counter is incremented by one.
  • Step 909 Determine whether the continuous imbalance state threshold is reached. If yes, go to step 910; otherwise, return to step 904.
  • Step 910 Perform data flow correction.
  • Step 911 If the port number of the TCP cannot be detected, it is directly put into the 4G RLC processing, and the process ends to continue the next data packet.
  • the data of the same TCP connection can be processed through the same RLC module for a period of time to avoid out-of-order, and the air interface transmission capability of 4G and 3G can be changed in real time to improve the air interface utilization. s efficiency.
  • the present invention uses two independent RLC streams to transmit downlink data, and further, a method of transmitting data for how to allocate the two independent RLC data streams.
  • the PDCP module of the primary anchor station schedules the data to be sent, and transmits the data to be sent to the 3G RLC module and/or the 4G RLC module for processing; 3G RLC module And the 4G RLC module performs independent data processing through different RLC modules, and sends the processed data to the NodeB and the eNB respectively; the eNB and the NodeB respectively send data from the 4G RLC module and the 3G RLC module to the UE.
  • the downlink data is transmitted by using two independent RLC streams, so that the downlink data throughput of the UE can be improved, and the downlink rate and efficiency of the carrier aggregation scenario are improved.

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

Abstract

L'invention porte sur un procédé de transmission à dérivation RLC, comprenant les opérations suivantes : le module PDCP d'un point d'ancrage principal planifie les données à transmettre, et transmet les données à transmettre à un module RLC 3G et/ou à un module RLC 4G en vue d'un traitement ; le module RLC 3G et le module RLC 4G traitent indépendamment les données par l'intermédiaire de différents modules RLC respectivement, et transmettent les données traitées à un nœud B et à un nœud B évolué respectivement ; le nœud B évolué et le nœud B transmettent respectivement les données provenant du module RLC 4G et du module RLC 3G à un UE. Un système de transmission à dérivation RLC est également décrit d'une manière correspondante. La présente invention adopte deux flux RLC indépendants pour transmettre des données de liaison descendante, ce qui améliore le débit de données de liaison descendante de l'UE et améliore la vitesse de liaison descendante et l'efficacité dans le contexte d'une agrégation de porteuses.
PCT/CN2012/075042 2011-08-22 2012-05-03 Procédé et système de transmission à dérivation rlc WO2013026290A1 (fr)

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