CN109729554B - Uplink enhanced data transmission method and device and user equipment - Google Patents
Uplink enhanced data transmission method and device and user equipment Download PDFInfo
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- CN109729554B CN109729554B CN201711036787.7A CN201711036787A CN109729554B CN 109729554 B CN109729554 B CN 109729554B CN 201711036787 A CN201711036787 A CN 201711036787A CN 109729554 B CN109729554 B CN 109729554B
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Abstract
The invention provides an uplink enhanced data transmission method, an uplink enhanced data transmission device and user equipment. The method comprises the following steps: if only partial segmented PDUs of the RLC PDUs are transmitted to the network side equipment in the current TTI, after receiving status PDUs which are transmitted by the network side equipment and contain retransmission instructions, transmitting the rest segmented PDUs of the RLC PDUs to the network side equipment in the next TTI; and receiving the message of successful reception sent by the network side equipment. The invention can avoid the network side equipment and the user equipment from discarding correct data, thereby avoiding RLC reset and waste of air interface resources.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for transmitting uplink enhanced data, and a user equipment.
Background
The LTE wireless access system is divided into three layers: the first layer (L1) is a Physical layer (PHY), the second layer (L2) is a Media Access Control sublayer (MAC), a Radio Link Control sublayer (RLC), and a Packet Data Convergence Protocol sublayer (PDCP), and the third layer (L3) is a Radio Resource Control layer (RRC).
The RLC layer, which is located above the MAC layer and is part of L2, provides segmentation (sender)/reassembly (receiver) and retransmission services for user and control data. An RLC PDU (Protocol Data Unit) is an RLC layer Protocol Data Unit, an L2 uplink enhancement technology can set an uplink RLC PDU to be in a variable length mode, when a MAC layer is configured as an MAC-i entity, and a UE performs uplink E-TFC (Enhanced Dedicated Channel Transport Format Combination) selection, RB (Radio Bearer) uplink Data can generate a segmented RLC PDU, that is, the PDU only transmits a part in a current TTI (Transmission Time Interval), and remaining Data needs to be transmitted in a next TTI.
The RLC PDU sending priority in acknowledged mode is: the priority of the control PDU is higher than that of the retransmission PDU, and the priority of the retransmission PDU is higher than that of the newly transmitted PDU. If a certain RB has both retransmission PDU and segmentation PDU, the UE side must transmit the retransmission PDU preferentially and then transmit the segmentation PDU according to the current protocol description. Thus, since the network side does not collect all segments of the segmented PDU completely in consecutive TTIs, according to the MAC-I PDU packet protocol, the network side discards the segmented PDU that has been received correctly, and the UE must discard the unsent segmented PDU and retransmit the PDU, which causes unnecessary waste of resources, and the flow chart of transmitting the retransmitted PDU first and then transmitting the segmented PDU is shown in fig. 1. And when the network signal is weak and the service authorization is small, the segmented PDU is always retransmitted, and finally RLC Reset (RLC Reset) is caused, which affects the UE data transmission, and a flowchart of UE triggering Reset is shown in fig. 2.
Disclosure of Invention
The uplink enhanced data transmission method, the device and the user equipment provided by the invention can avoid that the network side equipment and the user equipment discard correct data, thereby avoiding RLC reset and waste of air interface resources.
In a first aspect, the present invention provides a method for transmitting uplink enhanced data, where the method includes:
if only partial segmented PDUs of the RLC PDUs are transmitted to the network side equipment in the current TTI, after receiving status PDUs which are transmitted by the network side equipment and contain retransmission instructions, transmitting the rest segmented PDUs of the RLC PDUs to the network side equipment in the next TTI;
and receiving the message of successful reception sent by the network side equipment.
Optionally, the information of the segmentation status field of the segmented PDU is used to notify the RLC PDU received by the network side device as the segmented PDU.
Optionally, after the transmitting, to the network side device, the remaining segmented PDUs of the RLC PDUs, the method further includes: and sending new RLC data PDU to the network side equipment.
In a second aspect, the present invention provides an apparatus for uplink enhanced data transmission, where the apparatus includes:
a first sending unit, configured to, if only a partial segmented PDU of RLC PDUs is sent to the network side device in a current TTI, send, after receiving a status PDU including a retransmission indication sent by the network side device, remaining segmented PDUs of the RLC PDUs to the network side device in a next TTI;
and the receiving unit is used for receiving the message of successful receiving sent by the network side equipment.
Optionally, the information of the segmentation status field of the segmented PDU is used to notify the RLC PDU received by the network side device as the segmented PDU.
Optionally, the apparatus further comprises:
and the second sending unit is used for sending new RLC data PDU to the network side equipment after the first sending unit sends the rest segmented PDU of the RLC PDU to the network side equipment.
In a third aspect, the present invention provides a user equipment, where the user equipment includes the above uplink enhanced data transmission apparatus.
According to the method, the device and the user equipment for transmitting the uplink enhanced data provided by the embodiment of the invention, if only the segmented PDU is transmitted to the network side equipment in the current TTI, after the message which is transmitted by the network side and needs to retransmit the PDU is received, the rest segmented PDUs are preferentially transmitted to the network side equipment in the next TTI, and then other data are transmitted. Compared with the prior art, the invention can avoid the network side equipment and the user equipment from discarding correct data by preferentially sending the residual segmented PDU, thereby avoiding RLC reset and waste of air interface resources.
Drawings
FIG. 1 is a flow diagram of an implementation of a retransmission-first PDU followed by the transmission of a remaining segmented PDU;
FIG. 2 is a flow diagram of an embodiment of triggering an RLC Reset;
fig. 3 is a flowchart illustrating an uplink enhanced data transmission method according to an embodiment of the present invention;
FIG. 4 is a diagram illustrating the structure of a MAC-is-PDU;
FIG. 5 is a diagram illustrating the structure of a MAC-i PDU;
fig. 6 is a flowchart of an uplink enhanced data transmission method according to another embodiment of the present invention;
fig. 7 is a schematic structural diagram of an uplink enhanced data transmission apparatus according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The present invention provides a method for transmitting uplink enhanced data, as shown in fig. 3, the method includes:
s11, if only partial segmented PDU of RLC PDU is sent to the network side equipment in the current TTI, after receiving the status PDU containing retransmission indication sent by the network side equipment, the rest segmented PDU of the RLC PDU is sent to the network side equipment in the next TTI;
and S12, receiving the message of successful reception sent by the network side equipment.
Optionally, the information of the segmentation status field of the segmented PDU is used to notify the RLC PDU received by the network side device as the segmented PDU.
Optionally, after the transmitting, to the network side device, the remaining segmented PDUs of the RLC PDUs, the method further includes: and sending new RLC data PDU to the network side equipment.
The RLC layer, which is located above the MAC layer and is part of L2, provides segmentation (sender)/reassembly (receiver) and retransmission services for user and control data. Segmentation is to segment the higher layer PDUs with different lengths into smaller RLC load units SDU (Service Data Unit) at the transmitting end, and one or more MAC-d/c PDUs or MAC-d/c PDUs are multiplexed in the MAC-is PDU. The reassembly is to group the data into MAC PDUs (MAC layer protocol data units) at the receiving end, and one or more MAC-is-PDUs are multiplexed into one MAC-i PDU. The structure diagrams of the MAC-is-PDU and the MAC-i PDU are shown in fig. 4 and 5, respectively.
In fig. 4, the value of the Segmentation Status field (SS) of the segmented PDU indicates the Segmentation Status of the PDU, and when the SS field information of the PDU received by the network side indicates that the PDU is segmented, a Status PDU is sent to the UE to indicate that the UE retransmits the PDU.
The present invention will be described in detail with reference to specific examples, and a flowchart is shown in fig. 6.
The UE sends PDU N and PDU N-1 to the network side, the PDU N is in a variable length mode and is segmented into Segment1, Segment2 and Segment3, when the UE only sends Segment1 and Segment2 in the current TTI, the network side equipment sends the state PDU requiring retransmission to the UE, the UE can send Segment3 in the next TTI first and then sends PDU N-1. Therefore, the network side successfully packages the segmented PDU according to the data packet protocol of the MAC-I PDU and the SS information of the segmented PDU, and therefore discarding of the segmented PDU and waste of air interface resources are avoided.
According to the uplink enhanced data transmission method provided by the embodiment of the invention, if only the segmented PDU is sent to the network side equipment in the current TTI, after the message which is sent by the network side and needs to retransmit the PDU is received, the rest segmented PDU is preferentially sent to the network side equipment in the next TTI, and then other data is sent. Compared with the prior art, the invention can avoid the network side equipment and the user equipment from discarding correct data by preferentially sending the residual segmented PDU, thereby avoiding RLC reset and waste of air interface resources.
An embodiment of the present invention further provides an uplink enhanced data transmission device, as shown in fig. 7, the device includes:
a first sending unit 11, configured to, if only a partial segmented PDU of RLC PDUs is sent to the network side device in a current TTI, after receiving a status PDU that is sent by the network side device and contains a retransmission indication, send remaining segmented PDUs of the RLC PDUs to the network side device in a next TTI;
the receiving unit 12 is configured to receive a message that the receiving is successful, where the message is sent by the network side device.
Optionally, the information of the segmentation status field of the segmented PDU is used to notify the RLC PDU received by the network side device as the segmented PDU.
Optionally, the apparatus further comprises:
and the second sending unit is used for sending new RLC data PDU to the network side equipment after the first sending unit sends the rest segmented PDU of the RLC PDU to the network side equipment.
In the uplink enhanced data transmission apparatus provided in the embodiment of the present invention, if only the segmented PDU is sent to the network side device in the current TTI, after receiving the message that the PDU needs to be retransmitted, the remaining segmented PDU is preferentially sent to the network side device in the next TTI, and then other data is sent. Compared with the prior art, the invention can avoid the network side equipment and the user equipment from discarding correct data by preferentially sending the residual segmented PDU, thereby avoiding RLC reset and waste of air interface resources.
The embodiment of the invention also provides the user equipment, and the user equipment comprises the uplink enhanced data transmission device.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like.
The above description is only for the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (7)
1. An uplink enhanced data transmission method, the method comprising:
if only partial segmented PDUs of the RLC PDUs are sent to the network side equipment in the current TTI, after receiving the status PDU containing retransmission instructions sent by the network side equipment, sending the rest segmented PDUs of the RLC PDUs to the network side equipment in the next TTI, and then sending the last RLC PDU needing to be retransmitted;
and receiving the message of successful reception sent by the network side equipment.
2. The method of claim 1, wherein the information of the segmentation status field of the segmented PDU is used to inform a network side device that the received RLC PDU is a segmented PDU.
3. The method of claim 1, wherein after said transmitting remaining segmented PDUs of the RLC PDUs to a network side device, the method further comprises: and sending new RLC data PDU to the network side equipment.
4. An apparatus for uplink enhanced data transmission, the apparatus comprising:
a first sending unit, configured to send, if only a partial segmented PDU of RLC PDUs is sent to the network side device in a current TTI, after receiving a status PDU that includes a retransmission indication and is sent by the network side device, remaining segmented PDUs of the RLC PDUs to the network side device in a next TTI, and then send a previous RLC PDU that needs to be retransmitted;
and the receiving unit is used for receiving the message of successful receiving sent by the network side equipment.
5. The apparatus of claim 4, wherein the information of the segmentation status field of the segmented PDU is used to inform a network side device that the received RLC PDU is a segmented PDU.
6. The apparatus of claim 4, further comprising:
and the second sending unit is used for sending new RLC data PDU to the network side equipment after the first sending unit sends the rest segmented PDU of the RLC PDU to the network side equipment.
7. A user equipment, characterized in that the user equipment comprises the uplink enhanced data transmission apparatus according to any one of claims 4 to 6.
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| TWI452885B (en) * | 2007-02-02 | 2014-09-11 | Interdigital Tech Corp | Method and apparatus for enhancing rlc for flexible rlc pdu size |
| WO2008140222A1 (en) * | 2007-05-09 | 2008-11-20 | Samsung Electronics Co., Ltd. | Method and apparatus for layer 2 arq for packets |
| KR101163875B1 (en) * | 2007-09-28 | 2012-07-13 | 인터디지탈 패튼 홀딩스, 인크 | Method and apparatus for generating radio link control protocol data units |
| JP2010541416A (en) * | 2007-09-28 | 2010-12-24 | インターデイジタル パテント ホールディングス インコーポレイテッド | Method and apparatus for extended transport format combination selection in wireless communications |
| US8693384B2 (en) * | 2008-05-29 | 2014-04-08 | Htc Corporation | Method for dynamic packet retransmission for radio link control layer in a wireless communications system |
| EP2332356B1 (en) * | 2008-09-23 | 2017-09-06 | Telefonaktiebolaget LM Ericsson (publ) | Rlc segmentation for carrier aggregation |
| KR20110020195A (en) * | 2009-08-21 | 2011-03-02 | 엘지전자 주식회사 | Apparatus and method of transmitting data block on uplink frequencies |
| EP3051736B1 (en) * | 2015-01-30 | 2020-04-29 | Panasonic Intellectual Property Corporation of America | Prioritization in the logical channel prioritization procedure for sidelink logical channels in ProSe direct communications |
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