WO2020134350A1

WO2020134350A1 - Method for improving downlink packet forwarding performance in weak field, terminal, and storage medium

Info

Publication number: WO2020134350A1
Application number: PCT/CN2019/110670
Authority: WO
Inventors: 尤斌
Original assignee: 深圳市中兴微电子技术有限公司
Priority date: 2018-12-26
Filing date: 2019-10-11
Publication date: 2020-07-02
Also published as: CN111372317A; CN111372317B

Abstract

Disclosed are a method for improving downlink packet forwarding performance in a weak field, a terminal and a storage medium. The method comprises: a terminal receives a serial number (SN) of a protocol data unit (PDU) from a network; trigger a random access process if the SN of the PDU from the network is inconsistent with the SN of a locally stored PDU expected to be received next time; and after a random access process is completed, the terminal applies to the network for uplink authorization and if the SN of a subsequently received PDU is inconsistent with the SN of the locally stored PDU expected to be received next time, notifies, by means of the uplink authorization, the network to resend the PDU. The present invention can reduce the concurrent conflict of downlink packet loss and random access process.

Description

Method, terminal and storage medium for improving downlink filling performance in weak field

Technical field

The invention relates to a technology for optimizing downlink data reception performance in a weak field, in particular to a method, terminal and storage medium for improving downlink filling performance in a weak field.

Background technique

Narrow-band Internet of Things (NB-IoT), the first 3GPP standard that was finalized in 2016, is gradually improved. It is an emerging branch in the field of mobile technology. The probability of packet loss due to downlink data in a weak field is higher. NB-IoT Most of the terminal chips are low-cost, considering the memory space limitation, when the downlink packet is lost, the network will be notified of the previous packet loss as soon as possible through the status report of the 3GPP protocol, and at this time, if there is no uplink authorization, the random access process will be triggered to obtain the uplink authorization. , But the random access process under NB-IOT technology is a half-duplex communication process (two-way alternating channel, that is, both parties can send information, but can not send or receive at the same time, one party must send the other party to receive, after a period of time Come here), during the random access process, the underlying physical layer module cannot receive downlink NPDSCH (NB Physical Downlink Shared Channel) data. In this case, the random access process will cause downlink packet loss. Limited to this, the terminal chip may fall into a "vicious circle" of downlink packet loss and random access processes.

Summary of the invention

In order to solve the above technical problems, embodiments of the present invention provide a method, terminal and storage medium for improving downlink packet filling performance in a weak field, which can reduce concurrent conflicts in downlink packet loss and random access processes.

In order to achieve the objective of the present invention, the present invention provides a method for improving the performance of downlink packet filling in a weak field, including:

The terminal receives the serial number SN of the protocol data unit PDU from the network;

If the SN of the PDU from the network is different from the SN of the locally stored PDU that is expected to be received next time, a random access process is triggered;

After the random access process is completed, the terminal applies to the network for uplink authorization. When the SN of the PDU subsequently received is different from the locally stored SN of the PDU that is expected to be received next time, the network side is notified to resend the PDU through the uplink authorization.

As an implementation manner, the terminal applying for uplink authorization from the network includes:

The terminal applies to the network for N uplink full authorizations, where N is an integer greater than or equal to 1.

As an implementation manner, the method further includes:

Each time the uplink authorization is used to notify the network side to retransmit the PDU, N is reduced by 1; when the N full uplink authorizations are all used up, if the terminal receives the SN of the PDU actually received and the locally stored PDU that it hopes to receive next time When the SN of is inconsistent, the random access process is triggered, and after the random access process is completed, the terminal applies to the network for uplink authorization again.

An embodiment of the present invention also provides a terminal for improving downlink filling performance in a weak field, including:

The RLC module of the radio link control layer is set to receive the serial number SN of the protocol data unit PDU from the network, and determine whether the SN of the PDU from the network is inconsistent with the locally stored SN of the PDU that is expected to be received next time. , Notify the media access control layer MAC module; and after the terminal completes the random access process, apply to the network for upstream authorization. When the SN of the PDU received subsequently is not consistent with the SN of the locally stored PDU that is expected to be received next time, pass The uplink authorization notifies the network side to resend the PDU;

The MAC module of the media access control layer is configured to trigger a random access process after receiving the notification of the RLC module.

As an implementation, the RLC module of the radio link control layer is set to apply for uplink authorization from the network, including:

Apply to the network for N uplink full authorizations, where N is an integer greater than or equal to 1.

As an implementation method, the RLC module of the radio link control layer is also set to notify the network side to retransmit the PDU every time the uplink authorization is used, and N is reduced by 1; when all the N uplink full authorizations are used up, if the subsequent subsequent actual reception When the serial number SN of the PDU does not match the locally stored SN of the PDU that is expected to be received next time, the media access control layer MAC module is notified again.

Embodiments of the present invention also provide a computer-readable storage medium, which stores computer-executable instructions, which when executed by a processor, improves the downlink filling performance under the weak field as described above Steps of the method.

Memory, set to store computer executable instructions;

The processor is configured to execute the computer-executable instructions to implement the steps of the method for improving the downlink filling performance in the weak field as described above.

Compared with the prior art, the present invention includes: the terminal receives the serial number SN of the protocol data unit PDU from the network; if the SN of the PDU from the network is not consistent with the locally stored SN of the PDU that is expected to be received next time, trigger Random access process; after the random access process is completed, the terminal applies for uplink authorization from the network, and when the SN of the PDU subsequently received does not match the SN of the locally stored PDU that is expected to be received next time, the network is notified by the uplink authorization The side retransmits the PDU. The invention can reduce the concurrent conflict of downlink packet loss and random access process.

Other features and advantages of the present invention will be explained in the subsequent description, and partly become obvious from the description, or be understood by implementing the present invention. The objects and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the description, claims and drawings.

BRIEF DESCRIPTION

The drawings are used to provide a further understanding of the technical solutions of the present invention, and form a part of the specification. They are used to explain the technical solutions of the present invention together with the embodiments of the present application, and do not constitute limitations on the technical solutions of the present invention.

Figure 1 is the flow chart of down-filling in weak field;

2 is a flowchart of a method for improving downlink packet filling performance in a weak field provided by an embodiment of the present invention;

FIG. 3 is a flow chart of a method for improving downlink filling performance in a weak field provided by an application example of the present invention;

FIG. 4 is a component block diagram of a terminal for improving downlink filling performance in a weak field provided by an embodiment of the present invention.

detailed description

To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments in the present application and the features in the embodiments can be arbitrarily combined with each other without conflict.

The steps shown in the flowcharts of the figures can be performed in a computer system such as a set of computer-executable instructions. And, although a logical order is shown in the flowchart, in some cases, the steps shown or described may be performed in an order different from here.

FIG. 1 is a flowchart of downlink packet filling under a weak field under normal circumstances. The downlink packet filling refers to the reception of a large number of downlink data packets.

Initially, the RLC on the UE side maintains a local variable Vrr, which represents the SN of the next PDU that it wishes to receive; during downlink filling, the UE side receives a downlink PDU with RLC_SN 0 from the network side and updates the local Vrr to 1;

The network side sends a downlink PDU with RLC_SN of 1, but because it is in a weak field and is lost at the air interface, the UE side does not receive the downlink PDU;

The UE side receives a downlink PDU with RLC_SN 2 and the local Vrr is still 1, which remains unchanged;

The RLC on the UE side judges that the RLC_SN is 2, which is inconsistent with the local Vrr. In order to receive the PDUs in order as soon as possible, the network side needs to be notified as soon as possible to send the downlink PDU with the previously lost RLC_SN of 1 as soon as possible. At this time, the RLC needs to send a status report , And MAC does not have uplink authorization at this time, so it needs to initiate a random access process to apply for uplink scheduling authorization from the network side;

Because the UE under the NB-Iot system uses the FDD half-duplex type-B mode, data cannot be sent and received at the same time. During the random access process, the UE side cannot receive PDUs with an RLC_SN of 3 issued by the network side. Receive the PDU with RLC_SN 1 and 4 (the PDU with RLC_SN 1 is requested by the UE to retransmit the network through the status report), and the UE side will be different because the value of the received RLC_SN = 4 and the local Vrr = 3, And trigger the random access process, and then fall into the "vicious circle" of downlink packet loss and random access process.

Based on the problems described in the above process, an embodiment of the present invention provides a method for improving downlink filling performance in a weak field. As shown in FIG. 2, the method includes:

The S201 terminal receives the serial number SN of the protocol data unit PDU from the network;

S202 If the SN of the PDU from the network is not consistent with the SN of the locally stored PDU that is expected to be received next time, trigger a random access process;

S203 After the random access process is completed, the terminal applies to the network for uplink authorization. When the SN of the PDU subsequently received is not consistent with the SN of the locally stored PDU that is expected to be received next time, the uplink authorization is used to notify the network side to resend the PDU. .

The terminal applies to the network for N uplink full authorizations, N is an integer greater than or equal to 1, and the full authorization refers to the theoretical maximum authorization value.

As an implementation manner, the method further includes:

The embodiments of the present invention can reduce concurrent conflicts in downlink packet loss and random access processes.

The following describes the embodiment of the present invention with a specific application example, as shown in FIG. 3.

The RLC on the UE side judges that the RLC_SN is 2, which is inconsistent with the local Vrr. In order to receive the PDUs in order as soon as possible, the network side needs to be notified as soon as possible to send the downlink PDU with the previously lost RLC_SN of 1 as soon as possible. At this time, the RLC needs to send a status report At this time, the MAC does not have an uplink authorization, so it needs to initiate a random access process to apply for an uplink scheduling authorization from the network side; the UE physical layer is in a random access process and cannot receive PDUs with an RLC_SN of 3 issued by the network side.

After the random access is completed, the UE sends a status report to the network side through the applied uplink scheduling authorization, and actively adds a BSR (buffer size report, periodically sent to the network when there is data on the UE side, 3GPP specific cells) to the network side Apply for 6 times more full authorization (6 times are experience values, depending on the time of the random access process, too little may subsequently trigger the random access process, and too much uplink scheduling will affect the downlink filling rate). , So that when subsequent downlink PDUs with RLC_SN 4 are received, it is not necessary to send a random access process to send the status report, but directly use the multi-application uplink scheduling authorization to send the status report. Since the MAC layer of the UE will not trigger the random access process any more, no packet loss due to random access will occur subsequently.

An embodiment of the present invention also provides a terminal for improving downlink filling performance in a weak field. As shown in FIG. 4, the terminal includes:

The RLC module 401 of the radio link control layer is configured to receive the serial number SN of the protocol data unit PDU from the network, and determine whether the SN of the PDU from the network is inconsistent with the locally stored SN of the PDU that is expected to be received next time. , Notify the media access control layer MAC module; and after the terminal completes the random access process, apply to the network for upstream authorization, when the SN of the subsequently received PDU is not consistent with the locally stored SN of the PDU that is expected to be received next time, Notify the network side to resend the PDU through the uplink authorization;

The media access control layer MAC module 402 is configured to trigger a random access process after receiving the notification from the RLC module 401.

As an implementation, the RLC module 401 of the radio link control layer is configured to apply for uplink authorization from the network, including:

Apply to the network N times for uplink full authorization, where N is an integer greater than or equal to 1, and the full authorization refers to the theoretical maximum authorization value. .

As an implementation method, the RLC module 401 of the radio link control layer is further set to notify the network side to retransmit the PDU every time the uplink authorization is used, and N is reduced by 1; when all the N uplink full authorizations are used up, if the subsequent When the serial number SN of the received PDU does not match the SN of the locally stored PDU that is expected to be received next time, the medium access control layer MAC module 402 is notified again.

An embodiment of the present invention also provides a computer-readable storage medium that stores computer-executable instructions. When the computer-executable instructions are executed by a processor, the downstream field is improved under weak fields as described in the previous embodiment. Package performance method steps.

Memory, set to store computer executable instructions;

The processor is configured to execute the computer-executable instructions to implement the steps of the method for improving downlink filling performance in a weak field as described in the previous embodiment.

Those of ordinary skill in the art may understand that all or some of the steps, systems, and functional modules/units in the method disclosed above may be implemented as software, firmware, hardware, and appropriate combinations thereof. In a hardware implementation, the division between the functional modules/units mentioned in the above description does not necessarily correspond to the division of physical components; for example, one physical component may have multiple functions, or one function or step may be composed of several physical The components are executed in cooperation. Some or all components may be implemented as software executed by a processor, such as a digital signal processor or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on computer-readable media, which may include computer storage media (or non-transitory media) and communication media (or transitory media). As is well known to those of ordinary skill in the art, the term computer storage medium includes both volatile and nonvolatile implemented in any method or technology for storing information such as computer readable instructions, data structures, program modules, or other data Sex, removable and non-removable media. Computer storage media include but are not limited to RAM, ROM, EEPROM, flash memory or other memory technologies, CD-ROM, digital versatile disk (DVD) or other optical disk storage, magnetic cartridges, magnetic tape, magnetic disk storage or other magnetic storage devices, or may Any other medium used to store desired information and accessible by a computer. In addition, it is well known to those of ordinary skill in the art that the communication medium generally contains computer readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transmission mechanism, and may include any information delivery medium .

Claims

A method for improving downlink filling performance in a weak field includes:

The terminal receives the serial number SN of the protocol data unit PDU from the network;

If the SN of the PDU from the network is different from the SN of the locally stored PDU that is expected to be received next time, a random access process is triggered;

After the random access process is completed, the terminal applies to the network for uplink authorization. When the SN of the PDU subsequently received is different from the locally stored SN of the PDU that is expected to be received next time, the network side is notified to resend the PDU through the uplink authorization.
The method for improving downlink filling performance in a weak field according to claim 1, wherein,

The terminal applying for uplink authorization from the network includes:

The terminal applies to the network for N uplink full authorizations, where N is an integer greater than or equal to 1.
The method for improving downlink filling performance in a weak field according to claim 2, wherein the method further comprises:

Each time the uplink authorization is used to notify the network side to retransmit the PDU, N is reduced by 1; when the N full uplink authorizations are all used up, if the terminal receives the SN of the PDU actually received and the locally stored PDU that it hopes to receive next time When the SN of is inconsistent, the random access process is triggered, and after the random access process is completed, the terminal applies to the network for uplink authorization again.
A terminal for improving downlink packet filling performance in a weak field includes:

The RLC module of the radio link control layer is set to receive the serial number SN of the protocol data unit PDU from the network, and determine whether the SN of the PDU from the network is inconsistent with the locally stored SN of the PDU that is expected to be received next time. , Notify the media access control layer MAC module; and after the terminal completes the random access process, apply to the network for upstream authorization. When the SN of the PDU received subsequently is not consistent with the SN of the locally stored PDU that is expected to be received next time, pass The uplink authorization notifies the network side to resend the PDU;

The MAC module of the media access control layer is configured to trigger a random access process after receiving the notification of the RLC module.
The terminal for improving downlink filling performance in a weak field according to claim 4, wherein,

The radio link control layer RLC module is set to apply for uplink authorization from the network, including:

Apply to the network for N uplink full authorizations, where N is an integer greater than or equal to 1.
The terminal for improving downlink filling performance in a weak field according to claim 5, wherein,

The RLC module of the radio link control layer is also set to notify the network side to retransmit the PDU every time the uplink authorization is used, and N is reduced by 1; when the N uplink full authorizations are all used up, if the subsequent serial number SN of the actual received PDU When the SN of the locally stored PDU that is expected to be received next time is inconsistent, the medium access control layer MAC module is notified again.
A computer-readable storage medium storing computer-executable instructions, the computer-executable instructions are executed by a processor to achieve the improvement of the downlink down-filling in a weak field according to any one of claims 1 to 3. Performance method steps.
A terminal for improving downlink filling performance in a weak field includes:

Memory, set to store computer executable instructions;

The processor is configured to execute the computer-executable instructions to implement the steps of the method for improving downlink packet filling performance in a weak field according to any one of claims 1 to 3.