CN109729551B - Communication method, base station and device with storage function - Google Patents

Communication method, base station and device with storage function Download PDF

Info

Publication number
CN109729551B
CN109729551B CN201711041878.XA CN201711041878A CN109729551B CN 109729551 B CN109729551 B CN 109729551B CN 201711041878 A CN201711041878 A CN 201711041878A CN 109729551 B CN109729551 B CN 109729551B
Authority
CN
China
Prior art keywords
base station
communication
condition information
protocol layer
user equipment
Prior art date
Legal status (The legal status 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 status listed.)
Active
Application number
CN201711041878.XA
Other languages
Chinese (zh)
Other versions
CN109729551A (en
Inventor
欧阳玉玲
周婷
夏欣
郦振红
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Huizhou TCL Mobile Communication Co Ltd
Original Assignee
Huizhou TCL Mobile Communication Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Huizhou TCL Mobile Communication Co Ltd filed Critical Huizhou TCL Mobile Communication Co Ltd
Priority to CN201711041878.XA priority Critical patent/CN109729551B/en
Priority to PCT/CN2017/111641 priority patent/WO2019085042A1/en
Publication of CN109729551A publication Critical patent/CN109729551A/en
Application granted granted Critical
Publication of CN109729551B publication Critical patent/CN109729551B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/1607—Details of the supervisory signal
    • H04L1/1628—List acknowledgements, i.e. the acknowledgement message consisting of a list of identifiers, e.g. of sequence numbers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L2001/0092—Error control systems characterised by the topology of the transmission link
    • H04L2001/0097—Relays

Abstract

The invention discloses a communication method, a base station and a device with a storage function. The first base station and the second base station respectively establish different communication links with the same user equipment; when one of the first base station and the second base station receives the communication condition information of the user equipment through the communication link, the communication condition information is sent to the other one of the first base station and the second base station, so that the other base station performs an operation corresponding to the communication condition information. By the mode, the invention can prevent the overflow problem of the sending buffer area, reduce the resource waste and reduce the time delay.

Description

Communication method, base station and device with storage function
Technical Field
The present invention relates to the field of communications, and in particular, to a communication method, a base station, and a device having a storage function.
Background
With the progress of science and technology, people have higher and higher requirements on wireless communication. In order to implement URLLC (Ultra-reliable and low latency communications, low-latency and high-reliability scenarios), RAN (Radio Access Network) supports packet replication across multiple links to ensure high reliability, for the NR-NR (New Radio, New air interface) dual connection (dual connection may be understood as the same user equipment being connected to two base stations at the same time), one of the main motivations for the replication function is to use multiple packets to transmit on different paths, respectively, and the packets may be transmitted through the fastest link to meet the delay requirement.
However, the dual-connection architecture results in two potential problems, one is that the "slower" data packet transmission on one of the links may not keep up with the speed of the other link, and thus "jam" on the sender; the other is that the RLC (Radio Link Control) buffer of the sender overflows and the RLC ARQ (Automatic Repeat-reQuest) window of the receiver may not match the actual RLC SDU (service Data Unit) reception status.
Disclosure of Invention
The invention mainly solves the technical problem of providing a communication method, a base station and a device with a storage function, which can improve the communication quality in the process of carrying out data communication by utilizing at least two links.
In order to solve the technical problems, the invention adopts a technical scheme that: there is provided a communication method including: the first base station and the second base station respectively establish different communication links with the same user equipment; when one of the first base station and the second base station receives the communication condition information of the user equipment through the communication link, the communication condition information is sent to the other one of the first base station and the second base station, so that the other base station performs an operation corresponding to the communication condition information.
In order to solve the technical problem, the invention adopts another technical scheme that: provided is a communication method, comprising: establishing a first communication link between a first base station and user equipment; the first base station acquires current communication condition information and sends the communication condition information to a second base station so that the second base station performs operation corresponding to the communication condition information; and establishing a second communication link between the second base station and the user equipment, wherein the first communication link and the second communication link are used as mutual backup communication links.
In order to solve the technical problem, the invention adopts another technical scheme that: there is provided a base station including: a processor, memory, and communication circuitry; the processor is coupled to the communication circuit to implement the method as described above.
In order to solve the technical problem, the invention adopts another technical scheme that: there is provided an apparatus having a storage function, storing program data executable to implement the steps in the method as described above.
The invention has the beneficial effects that: different from the situation of the prior art, in the process of performing data communication by using at least two links, when the base station in one link receives the communication condition information of the user equipment as a communication opposite end, the base station in the other link shares the communication condition information with the base station in the other link, so that the base station in the other link can also know the communication condition of the other link and perform the operation corresponding to the communication condition information, thereby improving the communication quality
Drawings
Fig. 1 is a schematic flow chart of a first embodiment of a communication method provided by the present invention;
fig. 2 is a flowchart illustrating a second embodiment of the communication method provided by the present invention;
fig. 3 is a schematic structural diagram of an embodiment of downlink communication in the communication method provided by the present invention;
fig. 4 is a schematic diagram of an embodiment of a sequence number mapping table for a PDCP (Packet Data Convergence Protocol) PDU (Protocol Data Unit) and an RLC SDU provided in the present invention;
fig. 5 is a schematic structural diagram of an embodiment of uplink communication in the communication method provided by the present invention;
FIG. 6 is a schematic diagram illustrating one embodiment of a data coherency report provided by the present invention;
fig. 7 is a schematic structural diagram of a base station according to an embodiment of the present invention;
fig. 8 is a schematic diagram of a connection between a first base station, a second base station and a user equipment provided in the present invention;
fig. 9 is a schematic structural diagram of an embodiment of a device with a storage function according to the present invention.
Detailed Description
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 obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
Referring to fig. 1, fig. 1 is a schematic flow chart of a first embodiment of a communication method provided by the present invention, which includes the following steps:
step 101: the first base station and the second base station respectively establish different communication links with the same user equipment;
in a specific implementation scenario, in order to ensure the reliability of communication, a method of transmitting the same PDCP PDU packet through different communication links is adopted, that is, dual-connection communication or multi-connection communication. In this implementation scenario, the first base station and the second base station respectively establish different communication links with the same user equipment, and the same data packet may be transmitted through the two different communication links, thereby improving the reliability of communication.
Step 102: when one of the first base station and the second base station receives communication condition information of the user equipment through the communication link, sending the communication condition information to the other one of the first base station and the second base station so that the other base station performs an operation corresponding to the communication condition information;
in a specific implementation scenario, the first base station is a master base station, and the second base station is a slave base station of the first base station. In this implementation scenario, the first base station, the second base station, and the user equipment are in a downlink mode, and the first base station and the second base station respectively send the same PDCP PDU to the user equipment through different communication links. The communication condition comprises the sequence number of the PDCP PDU which is successfully received by the user equipment and is sent by the first base station and/or the second base station. And after receiving the communication condition, the first base station reads the sequence number of the PDCP PDU and sends the sequence number of the PDCP PDU to the second base station. In this implementation scenario, the first base station and the second base station may communicate with each other through an Xn interface.
The PDCP PDU is sent from the PDCP of the first base station as the master base station to the RLC of the local base station and the RLC of the second base station, and the RLC of the first base station and the RLC of the second base station segment the received PDCP PDU according to the communication condition of the local base station to form one or more RLC SDUs, each of which also has its own sequence number. Thus, a sequence number mapping table of the PDCP PDU and the RLC SDU exists in both the first base station and the second base station, and is used for tracking and recording the sequence numbers of one or more RLC PDUs corresponding to the PDCP PDU with a certain sequence number.
Therefore, after receiving the sequence numbers of the PDCP PDUs successfully received by the user equipment, the RLC of the first base station and the second base station may search for the sequence numbers of the corresponding RLC SDUs according to the sequence number mapping tables of the respective PDCP PDUs and RLC SDUs, and check whether the RLC SDUs with the sequence numbers are sent out, and if not, discard the RLC SDUs to make room for subsequent data transmission.
In another specific implementation scenario, the first base station, the second base station and the user equipment are in an uplink mode, and the PDCP of the first base station generates a data consistency report according to a condition that the base station successfully receives a PDCP PDU sent by the user equipment, and sends the data consistency report to the RLC of the base station and the RLC of the second base station. In this implementation scenario, the data consistency report includes the sequence number of the first PDCP PDU that is successfully received and the number of PDUs transmitted by the same link as the first PDCP PDU in the data consistency report. The RLC of the first base station and the RLC of the second base station may calculate the sequence number of the PDU to be received according to the data consistency report, and in this implementation scenario, the first base station and the second base station may communicate with each other through an Xn interface. In this implementation scenario, the first base station receives the PDCP PDU sent by the ue and the sequence number mapping table of the RLC SDU sent by the ue at the same time, and sends the mapping table to the second base station through the Xn interface. The RLC of the first base station and the RLC of the second base station find the serial number of the corresponding RLC SDU according to the mapping table and the serial number of the received PDCP PDU, check whether various automatic retransmission request windows are consistent with the serial number of the RLC SDU or not, and if not, adjust the automatic retransmission request windows to be positioned at the position where the serial number of the RLC SDU is consistent. For example, m PDUs have been successfully received from the first link currently, and the sequence number of the first PDU received from the first link is SNn, then the sequence number of the next PDU to be received is SNn + m. At this time, due to the second link being blocked, the PDU cannot be smoothly transmitted, and the arq window of the second base station is still located at SNn, so that the RLC of the second base station moves the arq window forward by m, and corresponds to the PDU with sequence number SNn + m, so as to receive the SDU corresponding to the PDU.
As can be seen from the above description, the first base station and the second base station RLC in this embodiment may adjust the position of the corresponding automatic retransmission request window by receiving the communication status sent by the PDCP of the first base station and adjusting in time according to the communication status, discard the data packet that does not need to be sent, and adjust the position of the corresponding automatic retransmission request window, so as to effectively prevent the problem of buffer overflow at the sending end, and avoid resource waste caused by the fact that the position of the automatic retransmission request window is not consistent with the actual status and requires retransmission.
Referring to fig. 2, fig. 2 is a schematic flow chart of a second embodiment of the communication method provided by the present invention, and the communication method provided by the present invention includes the following steps:
step 201: establishing a first communication link between a first base station and user equipment;
in a specific implementation scenario, a first communication link is established between the first base station and the user equipment, and a second communication link is established between the second base station and the user equipment. Specifically, the first communication link includes PDCP, PCL of the first base station and first RCL, PDCP of the user equipment, and the second communication link includes PDCP, PCL of the second base station and second RCL, PDCP of the user equipment. In this implementation scenario, the first base station is a master base station, and the second base station is a slave base station of the first base station.
Referring to fig. 3, fig. 3 is a schematic structural diagram of an embodiment of downlink communication of the communication method provided by the present invention. When downlink communication is carried out, a PDCP of a first base station serving as a main base station copies SDUs to be sent to user equipment into two groups of same SDUs, and the two groups of SDUs are transmitted through two different communication links, specifically, one group of SDUs are sent to a first RLC of the user equipment through the RLC of the main base station and then sent to the PDCP of the user equipment through the first RLC; and sending another group of SDUs to a second RLC of the user equipment through the second base station, namely the RLC of the slave base station, and then sending the second RLC to the PDCP of the user equipment. In this implementation scenario, the PDCP of the first base station sends a set of SDUs to be sent to the ue to the RLC of the second base station, i.e., the slave base station, via the Xn interface. In other implementation scenarios, the PDCP of the first base station sends a set of SDUs to be sent to the user equipment to the RLC of the second base station, i.e., the slave base station, via other interfaces.
When the first base station, that is, the RLC of the master base station and the second base station, that is, the RLC of the slave base station receive the SDU transmitted by the PDCP of the first base station, the SDU is segmented according to the communication condition and the communication condition of the current base station, and one PDCP PDU is divided into one or more RLC SDUs to be transmitted. Each PDCP PDU has a sequence number as an identification, and similarly, each RLC SDU has a sequence number as an identification. The sequence numbers of the PDCP PDUs are different from each other for easy discrimination. The sequence numbers of the RLC SDUs can be the same, and only the sequence numbers of a plurality of RLC SDUs divided by the same RLC PDU need to be ensured to be different. Therefore, the RLC of the first base station and the RLC of the second base station can both store mapping tables in which the sequence number of the PDCP PDU and the sequence numbers of one or more RLC SDUs segmented by the SDU correspond to each other.
Referring to fig. 4, fig. 4 is a diagram illustrating a sequence number mapping table for PDCP PDUs and RLC SDUs according to an embodiment of the present invention. As shown in fig. 4, the PDCP sequence number is the sequence number of the PDCP PDU, and the RLC sequence number is the sequence number of the RLC SDU. One PDCP PDU sequence number may correspond to a plurality of RLC SDU sequence numbers, for example, RDCP sequence number 1 corresponds to three sequence numbers of RLC SN1, RLC SN 2 and RLC SN3, or one RLC SDU sequence number, for example, RDCP sequence number 2 corresponds to RCL SNa. Either the first base station or the second base station may store a mapping table as shown in fig. 4.
The first RLC and the second RLC of the user equipment receive RLC SDUs from the RLC of the first base station and the RLC of the second base station respectively, and recombine the RLC SDUs to restore the original PDCP PDU, and the recombined RLC SDUs are sent to the PDCP of the user equipment.
Referring to fig. 5, fig. 5 is a schematic structural diagram of an embodiment of uplink communication in the communication method provided by the present invention. When carrying out uplink communication, the PDCP of the user equipment copies PDCP PDUs which need to be sent to the first base station and the second base station into two groups of same SDUs, and transmits the two groups of SDUs through two different communication links, specifically, one group of SDUs are sent to the RLC of the first base station through the first RLC of the user equipment, and then sent to the PDCP of the first base station through the RLC of the first base station; and sending the other group of SDUs to the RLC of the second base station through the second RLC, and then sending the RLC of the second base station to the PDCP of the first base station. In this implementation scenario, the RLC of the second base station sends a set of PDUs to the PDCP of the first base station over the Xn interface.
The first RLC and the second RLC of the user equipment each include an automatic retransmission request window, and receive RLC SDUs transmitted by the first base station RLC and the second base station RLC if and only if a reception position of the automatic retransmission request window matches a sequence number of the received RLC SDU.
When receiving SDUs transmitted by the PDCP of the user equipment, the first RLC and the second RLC of the user equipment segment the SDUs according to the communication condition and the communication condition of the current base station, and one PDCP PDU is divided into one or more RLC SDUs to be transmitted. Each PDCP PDU has a sequence number as an identification, and similarly, each RLC SDU has a sequence number as an identification. The sequence numbers of the PDCP PDUs are different from each other for easy discrimination. The sequence numbers of the RLC SDUs can be the same, and only the sequence numbers of a plurality of RLC SDUs divided by the same RLC PDU need to be ensured to be different. Thus, both the first RLC and the second RLC of the user equipment may store a mapping table in which the sequence number of the PDCP PDU and the sequence numbers of one or more RLC SDUs segmented from the SDU correspond to each other. The mapping table can be shown in fig. 4, and is not described here.
The RLC of the first base station and the RLC of the second base station both include an automatic retransmission request window, and the first base station RLC and the second base station RLC receive RLC SDUs transmitted by the first RLC and the second RLC of the user equipment if and only if a reception position of the automatic retransmission request window matches a sequence number of the received RLC SDU.
Step 202: when the first base station receives communication condition information of the user equipment through the first communication link, the first base station sends the communication condition information to a second base station, so that the first base station and the second base station perform operation corresponding to the communication condition information;
referring to fig. 3 again, fig. 3 is a schematic structural diagram of an embodiment of downlink communication of the communication method provided by the present invention. In a specific implementation scenario, the first base station serves as a master base station to receive communication status information sent by the user equipment, and in this implementation scenario, the user equipment generates a PDCP status report according to a successfully received PDCP PDU, where the PDCP status report includes a sequence number of the successfully received PDCP PDU. After receiving the report, the PDCP of the first base station reads the sequence numbers of the PDCP PDUs, and sends the sequence numbers to the RLC of the local base station and the RLC of the second base station. In this embodiment, the PDCP of the first base station sends these sequence numbers to the RLC of the second base station over the Xn interface.
In this implementation scenario, the ue periodically generates a PDCP status report according to a preset time period and according to the PDCP PDUs successfully received in the period, and sends the PDCP status report to the PDCP of the first base station. In other implementation scenarios, a PDCP status report may be generated and sent to the PDCP of the first base station according to the number of preset PDCP PDUs, every time the preset number of PDUs are received. In other implementation scenarios, when the number of bytes of the received PDU meets a preset value, a PDCP status report may be generated according to the number of bytes of the received PDU, and the PDCP status report may be sent to the PDCP of the first base station. In other implementation scenarios, the PDCP status report may be generated in response to request information sent by the first base station and/or the second base station, and sent to the PDCP of the first base station.
The RLC of the first base station and the RLC of the second base station respectively store a sequence number mapping table of a PDCP PDU and an RLC SDU, the RLC of the first base station and the RLC of the second base station find the sequence numbers of the RLC SDUs corresponding to the sequence numbers of the PDCP PDU according to the received sequence numbers of the PDCP PDU, check whether the RLC SDUs with the sequence numbers are already transmitted or not, and if the RLC SDUs with the sequence numbers are not already transmitted, discard the RLC SDUs with the sequence numbers.
Meanwhile, the PDCP of the user equipment generates a data consistency report according to the successfully received PDCP PDU, wherein the data consistency report comprises the sequence number and the number of the successfully received PDCP PDUs. The PDCP of the user equipment sends the data consistency report to the first RLC and the second RLC of the local base station. The first RLC and the second RLC of the user equipment read the sequence number of the PDCP PDU in the data consistency report. In this implementation scenario, the sequence numbers of the RLC SDUs received by the first RLC and the second RLC of the user equipment include identification information, and the first RLC and the second RLC of the user equipment can determine which PDCP PDU the RLC SDU corresponds to according to the identification information, thereby obtaining a correspondence between the sequence number of the PDCP PDU and the sequence number of the RLC SDU. Therefore, the first RLC and the second RLC are based on the number of PDCP PDUs in the data consistency report. And judging whether the current respective automatic retransmission request window position is matched with the RLC SDU to be received or not, and if not, adjusting the position of the automatic retransmission request window to enable the automatic retransmission request window position to be matched.
In other implementation scenarios, the RLC of the first base station and the RLC of the second base station may send sequence number mapping tables of the stored PDCP PDU and RLC SDU to the first RLC and the second RLC of the user equipment, so that the first RLC and the second RLC of the user equipment may confirm whether the respective automatic retransmission request window location matches the RLC SDU to be received by searching the mapping tables according to the sequence number in the data consistency report, and if not, adjust the location of the automatic retransmission request window to match the RLC SDU to be received.
Referring to fig. 6, fig. 6 is a schematic diagram of a data consistency report according to an embodiment of the present invention. As shown in FIG. 6, the data consistency report of the present invention includes the Start PDCP SN and the PDCP SN NUM. The Start PDCP SN indicates a sequence number of a first PDCP PDU received by the user equipment from the faster of the two links. The PDCP SN NUM indicates the number of PDUs received by the PDCP of the user equipment from the RLC of the base station included in the faster of the two links. According to the sequence number of the first received PDCP PDU and the number of successfully received PDUs transmitted by the same link with the PDCP PDU, the sequence number of the PDU to be received can be known, so that the sequence number of the corresponding RLC SDU can be estimated or searched from the mapping table. Thus, the RLC of the user equipment can correspondingly check and adjust the position of the ARQ window according to the sequence number of the RLC SDU.
In other implementation scenarios, after the first RLC and the second RLC of the user equipment adjust the position of the ARQ window, the first RLC and the second RLC of the user equipment update the sequence number mapping table of the PDCP PDU and the RLC SDU, and delete the sequence number of the discarded SDU from the mapping table.
Referring to fig. 5, fig. 5 is a schematic structural diagram of an embodiment of uplink communication in the communication method provided by the present invention. In a specific implementation scenario, the first base station serves as a master base station, and the PDCP thereof receives PDUs transmitted by the user equipment and transmits communication status information to the PDCP of the user equipment. In this implementation scenario, the PDU of the first base station generates a PDCP status report according to the successfully received PDCP PDU, where the PDCP status report includes a sequence number of the successfully received PDCP PDU. The PDCP of the user equipment receives the report, reads sequence numbers of the PDCP PDUs therein, and transmits the sequence numbers to the first RLC and the second RLC of the local base station.
In this implementation scenario, the PDCP of the first base station periodically generates a PDCP status report according to a preset time period and according to the PDCP PDUs successfully received in the preset time period, and sends the PDCP status report to the PDCP of the user equipment. In other implementation scenarios, a PDCP status report may be generated and sent to the PDCP of the user equipment, when receiving a preset number of PDUs according to the preset number of PDCP PDUs. In other implementation scenarios, the PDCP status report may be generated according to the number of bytes of the received PDU, when the number of bytes of the received PDU meets a preset value, and the PDCP status report is sent to the PDCP of the user equipment. In other implementation scenarios, the PDCP status report may be generated in response to request information sent by the first base station and/or the second base station, and sent to the PDCP of the first base station.
The first RLC and the second RLC of the user equipment respectively store a sequence number mapping table of a PDCP PDU and an RLC SDU, find the sequence numbers of the RLC SDUs corresponding to the first RLC and the second RLC of the user equipment according to the sequence numbers of the received PDCP PDUs, check whether the RLC SDUs with the sequence numbers are already transmitted or not, and discard the RLC SDUs with the sequence numbers if the RLC SDUs with the sequence numbers are not already transmitted.
Meanwhile, the PDCP of the first base station generates a data consistency report according to the successfully received PDCP PDUs, wherein the data consistency report comprises the sequence number and the number of the successfully received PDCP PDUs. The PDCP of the first base station sends the data consistency report to the RLC of the local base station and the RLC of the second base station. In this implementation scenario, the PDCP of the first base station sends the data consistency report to the RLC of the second base station over the Xn interface. The RLC of the first base station and the second base station reads the sequence number of the PDCP PDU in the data consistency report. In this implementation scenario, the sequence numbers of the RLC SDU received by the RLC of the first base station and the RLC of the second base station include identification information, and the RLC of the first base station and the RLC of the second base station can determine which PDCP PDU the RLC SDU corresponds to according to the identification information, thereby obtaining a correspondence between the sequence number of the PDCP PDU and the sequence number of the RLC SDU. Therefore, the RLC of the first base station and the RLC of the second base station may be based on the sequence number and the number of PDCP PDUs in the data consistency report. And judging whether the current respective automatic retransmission request window position is matched with the RLC SDU to be received or not, and if not, adjusting the position of the automatic retransmission request window to enable the automatic retransmission request window position to be matched.
In other implementation scenarios, the first RLC and the second RLC of the ue may send sequence number mapping tables of the stored PDCP PDU and RLC SDU to the RLC of the first base station and the RLC of the second base station, so that the RLC of the first base station and the RLC of the second base station may confirm whether the respective automatic retransmission request window location matches the RLC SDU to be received by searching the mapping tables according to the sequence number in the data consistency report, and if not, adjust the location of the automatic retransmission request window to match the RLC SDU to be received.
Referring to fig. 6, fig. 6 is a schematic diagram illustrating an embodiment of a data consistency report according to the present invention. The PDCP generated data consistency report of the first base station is also structured as shown in fig. 6, and includes a startptdcp sequence number and a PDCP sequence number NUM. The startpcp sequence number indicates the sequence number of the first PDCP PDU that the PDCP of the first base station received from the faster of the two links. The PDCP sequence number NUM indicates the number of PDUs received by the PDCP of the first base station from the RLC included in the faster of the two links. According to the sequence number of the first received PDCP PDU of the first base station and the number of successfully received PDUs transmitted by the same link with the PDCP PDU, the sequence number of the PDU to be received can be known, so that the sequence number of the corresponding RLC SDU can be estimated or searched from the mapping table. Thus, the RLC of the first base station and the RLC of the second base station can correspondingly check and adjust the position of the ARQ window according to the sequence number of the RLC SDU.
In other implementation scenarios, after the RLC of the first base station and the RLC of the second base station adjust the position of the ARQ window, the RLC of the first base station and the RLC of the second base station update the sequence number mapping tables of the PSDCPDU and the RLC SDU, and delete the sequence number of the discarded SDU from the mapping tables.
In this implementation scenario, both the first base station and the second base station are new air interface base stations, and in other implementation scenarios, only one of the first base station and the second base station may be a new air interface base station, or both of the first base station and the second base station may be other network base stations, such as a long term evolution network base station.
In other implementation scenarios, the second base station may be a master base station, and the first base station may be a slave base station of the second base station, and the working method and principle are basically the same as those described above, and only the functions of the first base station and the second base station need to be exchanged, which is not described herein again.
In this implementation scenario, the user equipment, the first base station, and the second base station employ a dual connection mode, and in other implementation scenarios, a multi-connection mode may also be employed, that is, one user equipment may simultaneously connect to multiple base stations.
In this implementation scenario, both the first base station and the second base station support the separation mode, so the PDCP of the first base station and the RLC of the second base station can communicate through the Xn interface.
As can be seen from the above description, in the embodiment, the user equipment, the first base station, and the second base station adopt the dual connectivity mode, the PDCP PDU receiver may notify the sender of the PDCP PDU to send the sequence number of the PDU that is successfully received, the sender of the PDCP PDU searches the corresponding RLC SDU sequence number according to the PDU sequence number, and discards an SDU having the sequence number but not yet sent, thereby vacating a buffer space of the sender, and avoiding overflow of the buffer space and link congestion including the buffer space. Meanwhile, the PDCP PDU receiver informs the sequence number of the RLC SDU which should be currently received by the RLC of the base station, and adjusts the position of each ARQ window to match with the RLC SDU to be received, thereby reducing unnecessary retransmission requirements, reducing resource waste and reducing time delay.
Referring to fig. 7, fig. 7 is a schematic structural diagram of a base station according to an embodiment of the present invention. The base station 10 comprises a processor 11, a memory 12 and a communication circuit 13. Processor 11 is coupled to memory 12 and communication circuitry 13.
Referring to fig. 8, fig. 8 is a schematic diagram of a connection between a first base station, a second base station and a user equipment according to the present invention. The structure of the first base station 20 and the second base station 30 is shown in fig. 7, and will not be described herein. The communication circuit 23 of the first base station 20 is connected to the communication circuit 33 of the second base station, and performs communication. The communication circuit 23 of the first base station 20 and the communication circuit 33 of the second base station are connected to the user equipment 40 to perform communication.
When performing downlink communication, the processor 21 of the first base station 20 sends the sequence numbers of the PDUs to be sent to the user equipment 40 to the memory 22 for storage, copies the PDUs to be sent into two groups of identical PDUs, and sends one group of the PDUs to the second base station 30 through the communication circuit 23. The second base station 30 receives the set of PDUs via the communication circuit 33. The processor 21 of the first base station 20 and the processor 31 of the second base station 30 segment the PDU to be transmitted into one or more SDUs according to their respective communication conditions and communication conditions, segment the PDU into one or more SDUs having their respective sequence numbers, generate a mapping table by the processor in correspondence with the sequence numbers of the PDU and the sequence numbers of the SDUs generated by its segmentation, and store the mapping table in their respective memories 22 and 32.
When the communication circuit 23 of the first base station receives the PDCP PDU status report transmitted by the user equipment 40, the processor 21 reads the sequence numbers of the successfully received PDCP PDUs included therein and transmits the sequence numbers to the second base station 30 through the communication circuit 23. The processor 21 of the first base station 20 and the processor 31 of the second base station 30 look up their corresponding RLC SDU sequence numbers in the mapping tables stored in the memories 22 and 32 according to the received sequence numbers and check whether RLC SDUs having these sequence numbers have been transmitted or not, and discard the RLC SDUs if not transmitted.
At the time of performing the uplink communication, the processor 21 of the first base station 20 generates a PDCP PDU status report according to the status of the PDCP PDU received by the communication circuit 23, and transmits the report to the user equipment 40 through the communication circuit 23. While the processor 21 generates a data consistency report and sends the report to the second base station 30 via the communication circuit 23. In this implementation scenario, the sequence numbers of the RLC SDUs received by the first base station 20 and the second base station 30 include identification information, and the RLC of the first base station and the RLC of the second base station can determine which PDCP PDU the RLC SDU corresponds to according to the identification information, so as to obtain a corresponding relationship between the sequence number of the PDCP PDU and the sequence number of the RLC SDU. The data consistency report includes the sequence number of the first PDCP PDU received by the first base station 20 and the number of PDUs successfully received and transmitted on the same link as the PDCP PDU.
The processor 21 of the first base station 20 and the processor 31 of the second base station 30 may estimate or look up the sequence number of the corresponding RLC SDU from the data consistency report from the mapping tables previously stored in the memories 22 and 32. The processor 21 of the first base station 20 and the processor 31 of the second base station 30 adjust the reception requirements of the communication circuits 23 and 33 according to the sequence numbers to match the current PDU reception status.
In this implementation scenario, the first base station is used as a master base station, in other implementation scenarios, the second base station may also be used as a master base station, and the first base station is a slave base station of the second base station.
As can be seen from the above description, the base station in this embodiment can correspondingly discard the SDU that is not needed to be sent and is not sent according to the receiving state of the PDCP PDU when performing downlink communication, thereby freeing up a space for sending the buffer, and adjusting the receiving requirement of the communication circuit in time when performing uplink communication, thereby avoiding time delay and resource waste caused by unnecessary retransmission.
Referring to fig. 9, fig. 9 is a schematic structural diagram of a device with a storage function according to the present invention. The device 50 with storage function stores at least one program or instruction 51, the program 51 or instruction being for executing the communication method as shown in fig. 1 to 2. In one embodiment, the apparatus with storage function may be a storage chip in a terminal, a hard disk, or a removable hard disk or other readable and writable storage tool such as a flash disk, an optical disk, or the like, and may also be a server or the like.
As can be seen from the above description, the program or the instruction stored in the embodiment of the apparatus with storage function according to this embodiment may vacate the transmission buffer space by acquiring the sequence number of the PDU that has been successfully received to delete the SDU corresponding to the PDU and that has not been transmitted, and adjust the position of the ARQ window by acquiring the number of the PDUs that have been successfully received and the initial sequence number of the PDU, so as to prevent the waste of resources and reduce the delay.
Different from the prior art that the correct position of the current ARQ window of the RLC of the receiving party is informed by the RLC of the sending party, the invention generates a data consistency report comprising the sequence number of the first PDU received by the PDCP and the number of the successfully received PDUs transmitted by the same link with the PDU through the PDCP of the receiving party, and informs the RLC of the receiving party, thereby reducing the resource consumption and the possibility of time delay.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims (19)

1. A method of communication, comprising:
establishing a first communication link between a first base station and user equipment;
the first base station receives communication condition information sent by user equipment, generates a data consistency report according to the communication condition information, and sends the data consistency report to a second base station, so that the second base station performs operation corresponding to the communication condition information;
wherein the step of the second base station performing the operation corresponding to the communication condition information includes: calculating the sequence number of the corresponding packet data convergence protocol layer protocol data unit in the automatic retransmission request window according to the data consistency report; comparing the current receiving position of the automatic retransmission request window with the sequence number, and if the receiving position is delayed than the sequence number, moving the receiving position to a position corresponding to the sequence number;
and establishing a second communication link between the second base station and the user equipment, wherein the first communication link and the second communication link are used as mutual backup communication links.
2. The method of claim 1,
the first base station is a master base station and the second base station is a slave base station of the first base station;
the method comprises the following steps that the first base station receives communication condition information sent by user equipment, generates a data consistency report according to the communication condition information, and sends the data consistency report to a second base station, so that the second base station performs operation corresponding to the communication condition information, and the method comprises the following steps:
a packet data convergence protocol layer of the first base station receives the communication condition information of the user equipment;
and the packet data convergence protocol layer of the first base station sends the communication condition information to a wireless link layer control protocol layer of the base station and to a wireless link layer control protocol layer of the second base station.
3. The method of claim 2,
and the packet data convergence protocol layer of the first base station sends the communication condition information to a radio link layer control protocol layer of the second base station through an Xn interface.
4. The method of claim 2, further comprising:
the packet data convergence protocol layer of the first base station sends data to be sent to a radio link layer control protocol layer of the first base station and a radio link layer control protocol layer of the second base station, so that the radio link layer control protocol layer of the first base station sends the data to be sent to the user equipment through the first communication link, and the radio link layer control protocol layer of the second base station sends the data to be sent to the user equipment through the second communication link;
wherein the operation of causing the second base station to perform corresponding communication condition information comprises: if the communication status information indicates that all or part of the data to be sent of the radio link layer control protocol layer of the base station has been successfully sent to the user equipment, the radio link layer control protocol layer of the second base station is notified to discard all or part of the data to be sent and the data to be sent is not sent to the user equipment through the second communication link;
and if the communication condition information indicates that all or part of the data to be sent of the wireless link layer control protocol layer of the second base station has been successfully sent to the user equipment, informing the wireless link layer control protocol layer of the base station to discard all or part of the data to be sent and not sending the data to be sent to the user equipment through the first communication link.
5. The method of claim 4,
the communication condition information comprises a packet data convergence protocol layer protocol data unit condition information report, and the packet data convergence protocol layer protocol data unit condition information report comprises a packet data convergence protocol layer protocol data unit sequence number which is successfully received by the user equipment.
6. The method of claim 5,
the wireless link layer control protocol layers of the first base station and the second base station store mapping tables of the serial number of the packet data convergence protocol layer protocol data unit and the serial number of the wireless link layer control protocol layer service data unit;
the operation of causing the second base station to perform corresponding communication condition information includes:
searching the corresponding wireless link layer control protocol layer service data unit sequence number in the mapping table according to the packet data convergence protocol layer protocol data unit sequence number successfully received by the user equipment;
detecting whether the radio link layer control protocol layer service data unit with the sequence number is sent or not, and if the radio link layer control protocol layer service data unit is not sent, discarding the radio link layer control protocol layer service data unit.
7. The method of claim 6, further comprising:
the radio link layer control protocol layers of the first and second base stations update the mapping table if the radio link layer control protocol layer service data unit is discarded.
8. The method of claim 1, wherein the first base station receives communication condition information sent by a user equipment, generates a data consistency report according to the communication condition information, and sends the data consistency report to a second base station, so that the second base station performs an operation corresponding to the communication condition information, and the method comprises:
and when the first base station acquires the communication state information of the base station, the first base station sends the communication state information to the second base station.
9. The method of claim 8,
the first base station is a master base station, the second base station is a slave base station of the first base station,
the first base station receives communication condition information sent by user equipment, generates a data consistency report according to the communication condition information, and sends the data consistency report to a second base station, so that the second base station performs an operation corresponding to the communication condition information, including:
and the packet data convergence protocol layer of the first base station sends the communication condition information to a radio link layer control protocol layer of the base station and a radio link layer control protocol layer of the second base station, so that the second base station performs operation corresponding to the communication condition information.
10. The method of claim 9, wherein the sending the communication condition information to the radio link layer control protocol layer of the first base station and the radio link layer control protocol layer of the second base station by the packet data convergence protocol layer of the first base station, so that the second base station performs an operation corresponding to the communication condition information comprises:
and the packet data convergence protocol layer of the first base station generates a data consistency report according to the communication condition information and sends the data consistency report to a wireless link layer control protocol layer of the second base station.
11. The method of claim 10, wherein the data consistency report comprises: the first base station receives the serial number of the packet data convergence protocol layer protocol data unit successfully and the number of the packet data convergence protocol layer protocol data units successfully transmitted by the same link with the packet data convergence protocol layer protocol data unit.
12. The method of claim 2, wherein the first base station and the second base station and the user equipment are in dual connectivity mode.
13. The method of claim 2,
at least one of the first base station and the second base station supports a split bearer mode.
14. The method of claim 2,
the first base station and the second base station are new air interface network base stations.
15. The method of claim 1, wherein the communication status information is transmitted by the UE according to a preset time period.
16. The method of claim 1, wherein the communication status information is sent by the UE with a predetermined number of intervals of PDU.
17. The method of claim 1, wherein the communication status information is sent by the UE in a preset number of bytes apart from the PDU.
18. The method of claim 1, wherein the communication condition information is sent by the ue based on request information sent by the first base station and/or the second base station.
19. A base station, comprising: a processor, memory, and communication circuitry;
the processor is coupled to the memory and the communication circuit and implements the method of any one of claims 1-18.
CN201711041878.XA 2017-10-30 2017-10-30 Communication method, base station and device with storage function Active CN109729551B (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN201711041878.XA CN109729551B (en) 2017-10-30 2017-10-30 Communication method, base station and device with storage function
PCT/CN2017/111641 WO2019085042A1 (en) 2017-10-30 2017-11-17 Communication method, base station, and apparatus having storage function

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201711041878.XA CN109729551B (en) 2017-10-30 2017-10-30 Communication method, base station and device with storage function

Publications (2)

Publication Number Publication Date
CN109729551A CN109729551A (en) 2019-05-07
CN109729551B true CN109729551B (en) 2022-03-25

Family

ID=66292896

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201711041878.XA Active CN109729551B (en) 2017-10-30 2017-10-30 Communication method, base station and device with storage function

Country Status (2)

Country Link
CN (1) CN109729551B (en)
WO (1) WO2019085042A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3959922B1 (en) * 2019-05-31 2023-10-25 Samsung Electronics Co., Ltd. Method and user equipment apparatus for optimizing radio resource for urllc services in dual connectivity technology
CN114079541A (en) * 2020-08-10 2022-02-22 华为技术有限公司 Method and device for indicating and determining serial number

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102685928A (en) * 2011-03-14 2012-09-19 华为技术有限公司 Information processing method of internet of things, base station and system of internet of things
CN105493555A (en) * 2013-09-26 2016-04-13 英特尔Ip公司 Bearer split ratios for dual connectivity systems

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102104493B1 (en) * 2013-05-10 2020-05-04 주식회사 팬택 Method and apparatus of transmitting data in wireless communication system supporting dual connectivity
US10075381B2 (en) * 2014-01-28 2018-09-11 Mediatek Inc. Buffer status report and logical channel prioritization for dual connectivity
WO2016106744A1 (en) * 2014-12-31 2016-07-07 华为技术有限公司 Data transmission method, wireless access device and communication system
CN105813213B (en) * 2014-12-31 2019-11-12 中国电信股份有限公司 Method, base station and the system of data are transmitted in dual link scheme
US9867226B2 (en) * 2015-12-14 2018-01-09 Qualcomm Incorporated Radio link failure (RLF) failover in a multi-connectivity environment

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102685928A (en) * 2011-03-14 2012-09-19 华为技术有限公司 Information processing method of internet of things, base station and system of internet of things
CN105493555A (en) * 2013-09-26 2016-04-13 英特尔Ip公司 Bearer split ratios for dual connectivity systems

Also Published As

Publication number Publication date
WO2019085042A1 (en) 2019-05-09
CN109729551A (en) 2019-05-07

Similar Documents

Publication Publication Date Title
US10939357B2 (en) Integrated access and backhaul adaptation layer status report
US8817806B2 (en) Method and apparatus for flow control between RLC and PDCP in a communication
US11729658B2 (en) PDCP packet-based DDDS frame transmission
KR101051595B1 (en) RLC window size reorganization
CN104837127B (en) Communication method performed by secondary base station and primary base station and corresponding base station
US11018984B2 (en) Packet data convergence protocol windows with split bearers
JP2017513371A (en) Data packet processing method and apparatus
CN110383775B (en) Data transmission method and communication device
KR102196939B1 (en) Appartus and method for data synchronization in cloud cell communication system
CN111148163B (en) Communication method and device
JP2005539465A (en) Reception window moving method in wireless mobile communication system
US20170099668A1 (en) Method, device and system for controlling air interface resource
EP3427511A1 (en) Configurable mapping of quality of service classes
WO2012155434A1 (en) A method, apparatus for data transmission and an enb
WO2018171607A1 (en) Communication method, distributed unit and control unit
EP2723125A1 (en) Communication method and communication apparatus
CN109729551B (en) Communication method, base station and device with storage function
EP3484081B1 (en) Data retransmission method and device
CN107317760B (en) SDU (service data Unit) segmentation processing method and data receiving end
US20210377816A1 (en) Handover Method, Apparatus, and System in Wireless Communication System
JP2023532259A (en) Flow control method and apparatus
CN112398589B (en) Method and device for data transmission in relay network
CN111757399B (en) Switching method, device and system in wireless communication system
CN108282815B (en) Data processing method and data processing equipment
US11140594B2 (en) Methods and service nodes for transferring a service session for a wireless device

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant