WO2011147177A1

WO2011147177A1 - Data transmission method and system

Info

Publication number: WO2011147177A1
Application number: PCT/CN2010/080024
Authority: WO
Inventors: 张苑
Original assignee: 中兴通讯股份有限公司
Priority date: 2010-05-28
Filing date: 2010-12-20
Publication date: 2011-12-01
Also published as: CN102264100A; CN102264100B

Abstract

A data transmission method applied to the data transmission service of the Acknowledged Mode (AM) is provided. The method comprises: after initiating the Move Receiving Window (MRW) process according to the discarding mode of a service data unit (SDU), the Radio Link Control (RLC) entity of a sending terminal sends a status packet with the Move Receiving Window Super Field (MRW SUFI) and constructs a temporary sending window; and before receiving the Move Receiving Window Acknowledgement (MRW ACK) sent by the RLC entity of a receiving terminal, the RLC entity of the sending terminal sends the Acknowledged Mode Data Protocol Data Unit (AMD PDU) existing in the temporary sending window. A data transmission system is also provided. It can make greater use of the bandwidth during the MRW process by employing the present technical solutions, so as to improve the sending rate without influencing the normal transmission of the MRW process.

Description

Data transmission method and system

The present invention relates to the field of communications technologies, and in particular, to a data transmission method and system.

Background technique

In the third generation mobile communication technology (The 3 ^M Generation, 3G) of the Universal Mobile Telecommunications System (Universal Mobile Telecommunications System, UMTS) are, the Uu interface protocol stack is divided into a physical layer, a data link layer and a network layer. The Radio Link Control (RLC) sublayer of the data link layer provides transparent mode (Transparent Mode, ΤΜ), Unacknowledged Mode (UM), and Acknowledged Mode (AM) for the upper layer. Three modes of data transmission services, such as segmentation, concatenation, padding, error control, and flow control. In the AM, after receiving the upper layer Service Data Unit (SDU), the RLC entity of the transmitting end segments and serializes the SDU to form one or more acknowledged mode data protocol data units (Acknowledged Mode Protocol). The Data Unit (AMD PDU) is transmitted. Each AMD PDU includes a 12-bit Sequence Number (SN) field, and the RLC entity sends the AMD PDU in the order of increasing SN. If the status report of the RLC entity at the receiving end is triggered, a status report including the receiving status is sent to the transmitting end, and the receiving end resends the AMD PDU indicated to be unsuccessfully received according to the status report. When an AMD SDU is not successfully sent and the discarding condition is met, the sending RLC entity will select to enter the Move Receiving Window (MRW) process or the RESET process according to the discarding manner of the upper layer configuration SDU. The SDU discarding mode of the upper layer configurable sender RLC entity includes: explicit signaling discarding based on the discarding timer, explicit signaling discarding based on the maximum number of retransmissions, and non-discarding based on the maximum number of retransmissions, The first two configurations will trigger the MRW (process. If the upper layer is configured to discard the explicit signaling SDU based on the maximum number of transmissions (the discarding of explicit signaling includes SDU dropping based on the maximum number of retransmissions and timer-based discarding) The SDU is discarded, which triggers the MRW process), when the AMD PDU is transmitted. When the number satisfies the equation VT(DAT) = MaxDat-1, the sender will discard all the SDUs included in the AMD PDU, where MaxDat is the maximum number of transmissions configured by the upper layer; if the upper layer is configured as timer-based SDU discarding When the timer expires and the corresponding SDU is not received correctly, the sender will discard the SDU. Thereafter, the transmitting end RLC entity will initiate an MRW process, by sending a status report with a Move Receiving Window Super Field (MRW SUFI), notifying the receiving end that the RLC entity moves the receiving window and discarding the outside of the receiving window. AMD PDU. The format of the MRW SUFI is as shown in FIG. 1 , where the SN—MRWi field is used to indicate which AMD PDU the discarding SDU ends, and the N field indicates that the SDU corresponds to the first length indicator ( LI ) in the AMD PDU. After receiving the status packet with MRW SUFI, the receiving end RLC entity moves the receiving window according to the MRW SUFI indication SN value, and responds by replying with the Move Receiving Window Acknowledgement Super Field (MRW ACK SUFI). The state packet informs the sender that the mobile reception window is successful. At this time, the sender RLC entity updates the transmission window according to the reception window movement condition. The following problems exist in the prior art: When a discarding SDU has a segment outside the transmission window, since the transmission window has not moved before the MRW ACK is received, no new data is transmitted on the transmitting end before the completion of the MRW process, thereby affecting the transmission. rate.

SUMMARY OF THE INVENTION The technical problem to be solved by the present invention is to provide a data transmission method and system. In the SDU discard mode, when a discarding SDU exists in a transmission window, it can be utilized to a greater extent without affecting the MRW process. Bandwidth, increase the data transmission rate. In order to solve the above technical problem, the present invention provides a data transmission method applied to an acknowledgement mode (AM) data transmission service, the method comprising: a sender radio link control (RLC) entity according to a service data unit (SDU) After the discarding mode initiates the mobile receiving window (MRW) process, a status packet with a mobile receiving window super domain (MRW SUFI) is transmitted, and a temporary transmitting window is constructed; and the transmitting RLC entity receives the receiving end RLC entity Sended mobile receiving window confirmation Prior to (MRW ACK), an acknowledge mode data protocol data unit (AMD PDU) present in the temporary transmission window is transmitted. The method further includes: the transmitting end RLC entity uses a temporary window flag to indicate whether a temporary transmission window σ is used. When the temporary window flag is 1, the values of the parameters VT (MRWA) and VT (MRWMS) are valid, and VT (MRWMS): VT (MRWA) + Tx - Window - Size; where VT (MRWA) is temporary At the bottom of the window of the send window, VT (MRWMS) is the top of the temporary send window, and Tx—Window—Size is the configured send window size. The step of constructing the temporary sending window by the sending end RLC entity includes: after initiating the MRW process, saving the acknowledgment mode data protocol data unit (AMD PDU) sequence number (SN) value at the end of the last discarded SDU data, and using the SN The AMD PDU corresponding to the value is used as the transmission window to construct a temporary transmission window. In the step of transmitting a status packet with MRW SUFI, the transmitting end RLC entity passes through

The PDU is sent in the manner of the status packet with the MRW SUFI; the method further includes: after receiving the PDU with the MRW SUFI, the receiving RLC entity first parses the Status PDU or the Piggybacked Status PDU, and moves Receive window; then parse the AMD PDU received within the same transmission time interval (TTI). The method further includes: the receiving end RLC entity parsing the Status PDU or the Piggybacked Status PDU, and after transmitting the receiving window, sending a status packet with a mobile receiving window acknowledgement super domain (MRW ACK SUFI), notifying the sending The RLC entity of the RLC entity succeeds; after receiving the status packet with MRW ACK SUFI, the transmitting RLC entity moves the sending window and initializes the temporary sending window to end the current MRW process. In order to solve the above technical problem, the present invention also provides a data transmission system, which is applied to confirm The data transmission of the mode, the device includes: a transmitting end radio link control (RLC) entity, where the sending end RLC entity comprises: a mobile receiving window (MRW) process initiating unit, a temporary sending window constructing unit and a data transmitting unit, wherein The MRW process initiating unit is configured to: after initiating the MRW process according to the discarding manner of the service data unit (SDU), send a status packet with a mobile receiving window super domain (MRW SUFI), and notify the temporary sending window structure The temporary transmission window construction unit is configured to: when receiving the notification from the MRW process initiation unit, construct a temporary transmission window; the data transmission unit is configured to: acknowledge the mobile reception window sent by the RLC entity at the receiving end (MRW) Before ACK), an acknowledge mode data protocol data unit (AMD PDU) present in the temporary transmission window is transmitted. The temporary transmission window construction unit is further configured to: use a temporary window flag to indicate whether a temporary transmission window is used; when the temporary window flag is 1, the values of the parameters VT (MRWA) and VT (MRWMS) are valid, And VT (MRWMS) = VT (MRWA) + Tx - Window - Size; where VT (MRWA) is the window of the temporary transmission window, VT (MRWMS) is the temporary transmission window window top, Tx - Window - Size is configured Send window size.

The temporary transmission window construction unit is configured to construct a temporary transmission window by storing an acknowledgment mode data protocol data unit (AMD PDU) sequence number (SN) value at the end of the last discarded SDU data, and corresponding to the SN value The AMD PDU is used as the send window to construct a temporary send window. The system further includes: a receiving end RLC entity, where the receiving end RLC entity includes a data receiving unit, where: the MRW process initiating unit is configured to send the MRW SUFI by means of a Status PDU or a Piggybacked Status PDU. a status packet; the data receiving unit is configured to: after receiving the PDU with the MRW SUFI, parse the Status PDU or the Piggybacked Status PDU, and move the receiving window, sending with a shift The dynamic receiving window confirms the status packet of the super domain (MRW ACK SUFI), notifies the sending end that the RLC entity MRW process is successful; and then parses the AMD PDU received in the same transmission time interval ( ΤΉ ); the MRW process initiating unit also sets To: After receiving the status packet with MRW ACK SUFI, move the send window and initialize the temporary send window to end the MRW process. With the technical solution of the present invention, the bandwidth can be utilized to a greater extent in the MRW process, thereby increasing the transmission rate and not affecting the normal transmission of the MRW process.

1 is a schematic diagram of a format of a MRW SUFI in an RLC AM mode; FIG. 2 is a schematic flowchart of a MRW process at a transmitting end according to an embodiment of the present invention; and FIG. 3 is a schematic flowchart of a process of a receiving end MRW according to an embodiment of the present invention.

Preferred embodiment of the invention

The core idea of the present invention is to provide a data transmission method, which is applied to a radio link control layer MRW process. When the MRW process is not completed, a temporary transmission window is constructed, so that it is outside the existing transmission window, but is completed in the MRW process. The AMD PDU that satisfies the transmission requirement can be transmitted during the MRW process, thereby effectively utilizing the bandwidth and increasing the transmission rate. Based on the above idea, the present invention provides a data transmission method, which is applied to an AM mode data transmission service, and the following technical solution is adopted: The RLC entity at the transmitting end initiates the MRW process according to the discarding mode of the upper layer configuration SDU, and the sending a status PDU of the MRW SUFI; and constructing a temporary transmission window with the AMD PDU at the end of the discarded SDU data as the transmission window; the RLC entity of the transmitting end does not receive the Move Receiving Window Acknowledgement (MRW ACK) , still transmitting the AMD PDUs present in the temporary transmission window. Further, the sender RLC entity saves the AMD where the last discarded SDU data ends. The PDU SN value, and the AMD PDU corresponding to the SN value is used as the transmission window to construct a temporary transmission window. The AMD PDU corresponding to the SN value is taken as the window bottom, because the PDU of the first unsuccessful transmission is the bottom of the transmission window. Therefore, in order to ensure that the transmission window and the receiving window are synchronized, the AMD PDU corresponding to the SN value is taken as the bottom of the window. Further, the sender RLC entity passes the status protocol data unit (Status Protocol

A status packet with MRW SUFI is sent in the form of a Data Unit, Status PDU or a Piggybacked Status Protocol Data Unit (Piggybacked Status PDU). Further, the sending end RLC entity maintains the SDU data sent by the upper layer, and detects whether the SDU data of the sending end meets the SDU discarding condition according to the upper layer configuration. If yes, the sending end RLC entity discards the SDU data that meets the discarding condition, and initiates The MRW process. The maintenance data refers to: receiving the SDU data sent by the upper layer, and maintaining the SDU data into a linked list, and saving the SN value of the AMD PDU at the end of the SDU when the AMD PDU is created. Further, after receiving the PDU with the MRW SUFI, the receiving end RLC entity first parses the Status PDU or the Piggybacked Status PDU, and moves the receiving window; and then parses the AMD PDU received in the same Transmission Time Interval (TTI). . Further, the receiving end RLC entity parses the Status PDU or the Piggybacked Status PDU, and after transmitting the receiving window, sends a status packet with the MRW ACK SUFI to notify the sending end that the MRW process is successful; after receiving the MRW ACK, the transmitting RLC entity sends the mobile packet. Window, and initialize the temporary send window to end the MRW process.

The implementation of the technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present invention and the features of the embodiments may be arbitrarily combined with each other without conflict. FIG. 2 is a flowchart of a process of transmitting a terminal MRW according to an embodiment of the present invention. The specific steps of the process are as follows: Step 201: The RRC entity of the sending end establishes an RLC AM entity, and configures the SDU discarding mode to discard the SDU of the explicit signaling. The optional configuration is the timer-based explicit signaling discarding or the explicit based on the maximum number of transmissions. The signaling is discarded. Step 202: When the SRC receives the SDU from the upper layer, the SDU maintains the SDU as a linked list, and saves the SN value of the AMD PDU at the end of the SDU when the AMD PDU is created. If the timer-based explicit signaling is discarded, step 203 is performed; if the upper-layer configuration SDU discarding mode is not timer-based explicit signaling discarding, step 204 is performed; Step 203: the sending end RLC entity is each SDU An SDU discard timer is started to detect whether the SDU is not successfully sent before the timer expires. If yes, the SDU is discarded, and step 205 is performed; if not, the process is exited; Step 204: The sender The RLC entity counts the number of times each AMD PDU is sent, and detects whether the number of times the PDU is sent exceeds the maximum number of retransmissions. If yes, discards all the SDUs in the AMD PDU, and performs step 205; Step 205: The sending end RLC entity searches for the AMD PDU where the last SDU node to be discarded is located according to the SN value information saved in step 202. Step 206: Set the AMD PDU SN to be the SN_MRWi value, and Set the temporary send window and use the bMrwWinFg flag to indicate whether the temporary send window is used. When this flag is 1, the values of the parameters VT(MRWA) and VT(MRWMS) are valid. Set VT (MRWA) to the SN value of the AMD PDU, and make VT (MRWMS): VT (MRWA) + Tx - Window - Size, where VT (MRWA) is the window of the temporary transmission window, and VT (MRWMS) is temporary Send window window top, Tx—Window—Size is the size of the send window configured in the upper layer; Step 207: When the TTI boundary of the transport channel carrying the service arrives, the RLC sender counts the total number of AMD PDUs in the temporary send window and is to be sent. The number of status PDUs, and report the amount of data on the logical channel to the Medium Access Control (MAC) sub-layer; in this step, only the AMD PDUs in the transmission window are counted and to be sent during reporting. The status PDU is not counted outside the sending window, and the buffer in the sending window is directly related to the window size Tx_Window_Size. Step 208: According to the bearer capability on the transport channel, the MRW SUFI may be sent to the receiving end in the form of a Piggybacked Status PDU or a Status PDU. Step 209: The transmitting RLC entity waits for the MRW ACK. If the MRW is not received within the indicated time, ACK, step 207 is performed, when the number of MRW SUFI transmissions reaches MaxMrw (MRW maximum number of transmissions), the RESET process is started; if the correct MRW ACK is received within the indicated time, step 210 is performed; Step 210: The receiving end RLC entity receives After MRW ACK, the actual send window is moved according to MRW ACK SUFI, and the bMrwWinFg flag and the corresponding temporary send window related variables are initialized.

FIG. 3 is a flowchart of a process of receiving a terminal MRW according to an embodiment of the present invention. The specific steps of the process are as follows: Step 301: After receiving the PDU in the TTI, the receiving RLC entity first parses the Piggybacked Status PDU or the Status PDU. And sending the reconfigurable SDU according to the SN_MRWi value indicated by the MRW SUFI in the Status PDU, and moving the receiving window; Step 302: After processing the Status PDU, parsing the AMD PDU received in the same TTI. At this time, the AMD PDUs are already in the receiving window; Step 303: The receiving RLC entity sends the MRW ACK to the transmitting end according to the receiving window movement condition.

It can be seen from the above process that the present invention can construct a temporary mobile transmission window without affecting the MRW process, so that the AMD PDU that satisfies the transmission requirement after the completion of the MRW process can be in the MRW process. Was sent in. Therefore, when the SDU needs to be discarded and the segment is outside the transmission window, the transmitting end can implement transmission of multiple PDU data in one TTI within the range of its carrying capacity, thereby improving the transmission rate.

The embodiment of the invention further provides a data transmission system, which is applied to the data transmission of the confirmation mode. The system includes a sender RLC entity, and the sender RLC entity further includes an MRW process initiation unit, a temporary transmission window construction unit, and a data transmission unit, where: the MRW process initiation unit is configured to: initiate according to the discarding mode of the SDU After the MRW process, the status packet with the MRW SUFI is sent, and the temporary transmission window construction unit is notified; the temporary transmission window construction unit is configured to: when receiving the notification from the MRW process initiation unit, construct a temporary transmission window; The data transmission unit is configured to: send the AMD PDU existing in the temporary transmission window before receiving the MRW ACK sent by the receiving end RLC entity. Further, the temporary transmission window construction unit is further configured to: use a temporary window flag to indicate whether a temporary transmission window is used; when the temporary window flag is 1, parameters VT (MRWA) and VT (MRWMS) The value is valid, and VT(MRWMS)= VT(MRWA)+Tx—Window— Size; where VT(MRWA) is the window of the temporary transmission window, and VT(MRWMS) is the temporary transmission window top, Tx—Window—Size The size of the send window for the configuration. Further, the temporary sending window construction unit is configured to construct a temporary sending window as follows: save the AMD PDU sequence number (SN) value at the end of the last discarded SDU data, and send the AMD PDU corresponding to the SN value as a sending At the bottom of the window, construct a temporary send window. Further, the system further includes: a receiving end RLC entity, the receiving end RLC entity further comprising a data receiving unit, wherein: the MRW process initiating unit is further configured to: pass a Status PDU or Piggybacked

The status PDU sends the status packet with the MRW SUFI; the data receiving unit is configured to: after receiving the PDU with the MRW SUFI, parse the Status PDU or the Piggybacked Status PDU, and move the receiving window to send A status packet with a mobile receiving window acknowledgement super-domain (MRW ACK SUFI), notifying the sender RLC entity that the MRW process is successful; and re-parsing the AMD PDU received in the same TTI; the MRW process initiating unit is further configured to: receive After the status packet with MRW ACK SUFI, the transmission window is moved, and the temporary transmission window is initialized, and the current MRW process is ended. One of ordinary skill in the art will appreciate that all or a portion of the above steps may be performed by a program to instruct the associated hardware, such as a read only memory, a magnetic disk, or an optical disk. Alternatively, all or part of the steps of the above embodiments may also be implemented using one or more integrated circuits. Correspondingly, each module unit in the foregoing embodiment may be implemented in the form of hardware, or may be implemented in the form of a software function module. The invention is not limited to any specific form of combination of hardware and software. It should be understood that those skilled in the art to which the present invention pertains may make corresponding equivalent changes or substitutions in accordance with the technical solutions of the present invention, and all such changes or substitutions should be included in the appended claims. The scope of protection.

Industrial Applicability With the technical solution of the present invention, bandwidth can be utilized to a greater extent in the MRW process, thereby increasing the transmission rate without affecting the normal transmission of the MRW process.

Claims

Claim

A data transmission method, characterized in that it is applied to an acknowledgement mode (AM) data transmission service, the method comprising: a sender radio link control (RLC) entity according to a service data unit (SDU) discarding method After initiating the mobile reception window (MRW) process, transmitting a status packet with a mobile reception window super domain (MRW SUFI), and constructing a temporary transmission window; and receiving, by the transmitting end, the RLC entity receives the mobile reception sent by the receiving end RLC entity Before the window acknowledgement (MRW ACK), the acknowledge mode data protocol data unit (AMD PDU) present in the temporary transmission window is transmitted.

2. The method of claim 1, the method further comprising: the transmitting RLC entity using the temporary window flag to indicate whether a temporary sending window is used.

3. The method according to claim 2, wherein when the temporary window flag is 1, the values of the parameters VT (MRWA) and VT (MRWMS) are valid, and VT (MRWMS) = VT (MRWA) + Tx — Window— Size; where VT(MRWA) is the window of the temporary sending window, VT (MRWMS) is the temporary sending window top, and Tx—Window—Size is the configured sending window size.

4. The method according to claim 1, 2 or 3, wherein the step of constructing the temporary transmission window by the transmitting end RLC entity comprises: after the initiating the MRW process, saving the acknowledge mode data protocol where the last discarded SDU data ends The data unit (AMD PDU) serial number (SN) value, and the AMD PDU corresponding to the SN value is used as the transmission window to construct a temporary transmission window.

5. The method of claim 1 wherein In the step of transmitting a status packet with MRW SUFI, the transmitting end RLC entity passes through

The PDU is sent in the manner of the status packet with the MRW SUFI; the method further includes: after receiving the PDU with the MRW SUFI, the receiving RLC entity first parses the Status PDU or the Piggybacked Status PDU, and moves Receive window; then parse the AMD PDU received within the same transmission time interval (TTI).

6. The method according to claim 5, further comprising: the receiving end RLC entity parsing the Status PDU or the Piggybacked Status PDU, and after transmitting the receiving window, transmitting the acknowledged super domain with the mobile receiving window (MRW ACK SUFI a status packet, notifying the sender RLC entity that the MRW process is successful; after receiving the status packet with the MRW ACK SUFI, the sender RLC entity moves the transmission window and initializes the temporary transmission window, ending the MRW process.

A data transmission system, characterized in that it is applied to an acknowledgment mode data transmission, the device comprising: a transmitting end radio link control (RLC) entity, the transmitting end RLC entity comprising: a mobile receiving window (MRW) a process initiation unit, a temporary transmission window construction unit, and a data transmission unit, wherein: the MRW process initiation unit is configured to: after the MRW process is initiated according to a discarding manner of a service data unit (SDU), sending a super-domain with a mobile reception window ( a status packet of the MRW SUFI), and simultaneously notifying the temporary transmission window construction unit; the temporary transmission window construction unit is configured to: when receiving the notification from the MRW process initiation unit, construct a temporary transmission window; the data transmission unit is configured to: The acknowledge mode data protocol data unit (AMD PDU) present in the temporary transmission window is transmitted before receiving the mobile reception window acknowledgement (MRW ACK) sent by the receiving end RLC entity.

The system according to claim 7, wherein the temporary transmission window construction unit is further configured to: The temporary window flag is used to indicate whether a temporary transmission window is used; when the temporary window flag is 1, the values of the parameters VT (MRWA) and VT (MRWMS) are valid, and VT (MRWMS) = VT (MRWA) + Tx—Window— Size; where VT(MRWA) is the window of the temporary sending window, VT (MRWMS) is the top of the temporary sending window, and Tx—Window—Size is the configured sending window size.

9. The system of claim 8 wherein

The temporary transmission window construction unit is configured to construct a temporary transmission window by storing an acknowledge mode data protocol data unit (AMD PDU) sequence number (SN) value at the end of the last discarded SDU data, and corresponding to the SN value The AMD PDU is used as the send window to construct a temporary send window.

10. The system of claim 9, the system further comprising: a receiving end RLC entity, the receiving end RLC entity comprising a data receiving unit, wherein: the MRW process initiating unit is configured to pass a Status PDU or Piggybacked Status Sending the status packet with the MRW SUFI in the manner of the PDU; the data receiving unit is configured to: after receiving the PDU with the MRW SUFI, parse the Status PDU or the Piggybacked Status PDU, and move the receiving window, the sending band There is a status packet of the mobile receiving window confirming the super domain (MRW ACK SUFI ), notifying that the RLC entity MRW process of the transmitting end is successful; and resolving the AMD PDU received within the same transmission time interval ( ΤΉ ); the MRW process initiating unit further Set to: After receiving the status packet with MRW ACK SUFI, move the send window and initialize the temporary send window to end the MRW process.