WO2005117395A1

WO2005117395A1 - Method for processing the data of the user surface

Info

Publication number: WO2005117395A1
Application number: PCT/CN2005/000755
Authority: WO
Inventors: Yongwei Chen; Zhenghua Tang; Jia Li; Weimin Ying; Hua Qiu; Hua Zhang
Original assignee: Huawei Technologies Co., Ltd.
Priority date: 2004-05-31
Filing date: 2005-05-30
Publication date: 2005-12-08
Also published as: CN100493081C; CN1705308A

Abstract

A method for processing the data of the user surface processes each IP packet transmitted from IP layer of the air interface protocol stack, the method includes: a. Determining if the receiving IP packet is acknowledgement ACK packet of Transfer Control Protocol(TCP ), if yes, continuing to b, or flow-controlling the IP packet; b. Processing the IP packet and obtaining a packet data convergence protocol (PDCP) packet. Based on the original data transmitting mechanism of TCP/IP and Universal Mobile Telephone System (UMTS), the method of the invention firstly transmits the ACK packet of TCP to the opponent, thereby reduces the respondent time-delay of the ACK packet of TCP and ensures a stable data transfer rate of the user surface.

Description

User plane data processing method

The invention relates to a data processing technology, in particular to a user-plane data processing method. Background of the invention

At present, with the development of communication technology, especially the development of 3G technology, data services will become one of the important services of mobile communication systems. This wireless data service will provide end users with a seamless connection to the Internet and allow users to get more convenient information through wireless systems. The existing Internet mainly uses the Transmission Control Protocol (TCP) / Internet Protocol (IP) for networking and data transmission. On the air interface, each protocol layer is divided into a user plane and a control plane, and data transmitted on the user plane is called user plane data. When the TCP transmission mechanism is combined with the Global System for Mobile Communications (UMTS), the user plane data of the air interface is divided into two types: TCP acknowledgement (ACK) data packets and non-TCP ACK data packets. However, many studies have shown that TCP's performance in wireless transmission is not very satisfactory.

According to the existing TCP transmission mechanism and the air interface transmission characteristics of UMTS, when the user plane data transmission is performed simultaneously in the uplink and the downlink, especially in asymmetric services, the air interface and TCP transmission. The cooperation of the transmission mechanism is often not satisfactory. effect. For example: After the downlink sender sends a TCP data packet, according to the TCP ACK packet reply mechanism, the downlink receiver needs to return an ACK packet to the sender, and then the sender can confirm whether the receiver has received the TCP data packet; As the two-way data transmission, the uplink sender, the above-mentioned downlink receiver, will also send TCP data packets. Therefore, the uplink TCP data packets may block the reply of the ACK data packets of the downlink TCP data packets on the air interface. If the ACK data packets are caused The delay of the reply is large. The sender will think that the TCP data packet is not sent and resend it, so that the data packet blocked on the air interface This greatly increases the delay of the ACK data packet response, and the sender may even start the congestion mechanism according to TCP to slow down the transmission rate, thereby greatly reducing the overall user plane data transmission efficiency.

At present, regarding how to improve the performance of TCP user plane data transmission on wireless and asymmetric networks, the protocols RFC3481 and RFC3449 respectively provide relevant strategies, including: Adjusting the TCP window size of the sender and receiver, increasing the sender's Initial sending window, limiting the sender ’s sending rate, adjusting the size of the maximum data transmission unit (MTU), enabling the path MTU detection mechanism on the sender, enabling selective ACK on the sender and receiver, enabling the direct congestion notification mechanism, enabling time Poke mechanism, do not use TCP / IP header compression algorithm, modify the receiver to return ACK mechanism and so on.

These technical solutions are to adjust the parameters and mechanisms of the existing TCP / IP accordingly, and to a certain extent improve the performance of TCP user plane data transmission in wireless networks. However, these measures do not really solve the problem of the interaction between uplink and downlink when the uplink and downlink are transmitting data simultaneously in a wireless network. These adjustments cannot guarantee that the user plane data flow maintains a stable rate on the air interface, and it will inevitably generate a buffer of data on the air interface. And burst, which causes TCP to use the congestion mechanism, leading to instability of the data transmission rate. In addition, the above adjustments cannot produce unified and beneficial effects. Often, different parameter combinations are used for different application environments to achieve a certain effect. In actual wireless network applications, the hosts of Internet service nodes are uncontrollable. Or, another IP terminal is a mobile phone. It is unrealistic to adjust the TCP / IP parameters of an uncontrollable host or modify the TCP / IP parameters by ordinary mobile phone users, which does not meet the actual application requirements of the network. In addition, some of these measures require redesign and implementation of TCP / IP, which will affect the data transmission of the existing network and are not feasible for the existing network. Summary of the invention

In view of this, the main object of the present invention is to provide a user-plane data processing method, and on the basis of maintaining the original TCP / IP and UMTS data transmission mechanisms, preferentially send TCP ACK data packets to the other party, thereby reducing TCP The response delay of the ACK data packet ensures a stable user-plane data transmission rate.

To achieve the above object, the technical solution of the present invention is implemented as follows:

(The blue part need not be read, this claim is copied over.)

The invention discloses a user plane data processing method for processing each IP data packet delivered from the IP layer of an air interface protocol stack. The method includes:

a. Determine whether the currently received IP data packet is a TCP ACK data packet, and if so, perform step b; otherwise, perform flow control on the IP data packet;

b. Process the IP data packet to obtain a Packet Data Convergence Protocol (PDCP) data packet.

In step a, when the ACK packet is determined to be TCP, the method further includes: identifying the IP data packet as a high priority; the flow control in step a is: identifying the IP data packet as a low priority; After step b, the method further includes: the radio link control protocol (RLC) layer processes the PDCP data packet to obtain an RLC data packet, and determines whether the obtained RLC data packet is a high-priority data packet, and if so, the RLC The data packet is allocated to a logical channel with a high priority; otherwise, the RLC data packet is allocated to a logical channel with a low priority.

The method further includes: the PDCP layer acquires current air interface data transmission performance; in step a, performing flow control according to the acquired air interface data transmission performance.

Wherein, the air interface data transmission performance includes an air interface congestion indication; the flow control in step a is: the PDCP layer buffers IP data packets; judging whether the air interface is congested according to whether the obtained air interface congestion indication is valid, and if so, ending the current processing; Otherwise, the buffered IP data packet is read and sent to the PDCP function processing module. The air interface data transmission performance further includes: an air interface rate; in the flow control in step a, the sending an IP data packet to the PDCP function processing module is: sending the IP data packet at the obtained air interface rate. In the flow control in step a, when the air interface is determined to be congested, the method further includes: reading the buffered IP data packet, and sending the IP data packet to the PDCP function processing module at a rate lower than the air interface rate, and performing step b.

The air interface data transmission performance is an air interface rate. In step a, the flow control is: the PDCP layer buffers IP data packets, reads the buffered IP data packets, and sends the IP data packets to itself at the acquired air interface rate. PDCP function processing module.

The method for obtaining air interface data transmission performance is: The media access control protocol MAC layer calculates the air interface data transmission performance based on the monitored air interface data transmission parameters and reports it to the PDCP layer.

Wherein, the method for obtaining air interface data transmission performance is: the MAC layer reports the monitored air interface data transmission parameters to the PDCP layer, and the PDCP layer calculates the air interface data transmission performance according to the air interface data transmission parameters.

The method further includes: connecting a portable machine to the UE side and the network host side of the user equipment, and each portable machine intercepts the IP data packet from the UE and the network host; each portable machine performs step a on the intercepted IP data packet. Said processing; after step a, further comprising: sending, by the portable machine, the intercepted IP data packet back to the PDCP layer of the UE or the network host connected to it.

The method further includes: setting the air interface rate of each connected UE or network host in each portable machine; in step a, the flow control is: the portable machine caches the IP data packet and caches the cached IP data packet The rate sent back to the UE or the network host is adjusted to the set air interface rate.

It can be seen from the foregoing solution that the key of the present invention is: analyzing the TCP header of the IP data packet delivered by the IP layer; and then directly sending the TCP ACK data packet, and Non-TCP ACK: The packets are sent after flow control. Therefore, the TCP ACK data packet can be preferentially delivered to the air interface.

In summary, the user-side data processing method provided by the present invention only needs to add some packet analysis and flow control processing to the functional processing of each protocol layer of the original air interface. Therefore, the method of the present invention can maintain the original TCP Based on the / IP and UMTS data transmission mechanisms, TCP ACK packets are preferentially issued, which basically prevents TCP ACK packets from being blocked on the air interface by non-TCP ACK packets, reducing the response delay of TCP ACK packets, thereby Improve the transmission performance of user plane data as a whole. Brief description of the drawings

FIG. 1 is a schematic flowchart of a process of a first preferred embodiment of the method of the present invention;

Figure 2 is a schematic diagram of the distribution structure and corresponding relationship between the protocol layers of the UE and UTRAN in the air interface protocol stack;

FIG. 3 is a schematic diagram of a processing flow of a second preferred embodiment of the method of the present invention; FIG.

FIG. 4 is a schematic process flow diagram of a third preferred embodiment of the method of the present invention. Mode of Carrying Out the Invention

The present invention will be described in further detail below with reference to the drawings and specific embodiments.

The main processing idea of the present invention is: judging each IP data packet delivered from the IP layer of the air interface protocol stack. If the IP data packet is a TCP ACK data packet, it is directly sent, so as to sequentially perform the protocol stipulated. Processing of packet data convergence protocol (PDCP) layer, wireless link control protocol (RLC) layer, etc .; if the IP data packet is a non-TCP ACK data packet, flow control is performed on the data packet, after the flow control Processes such as the PDCP layer and the RLC layer are performed.

FIG. 1 is a schematic flowchart of a process according to a first preferred embodiment of the method of the present invention. In this embodiment, the flow control method of the non-TCP ACK data packet is: each TCP sent from the IP layer The ACK data packet is identified as a high priority. Then, after the PDCP layer process is performed on the IP data packet to obtain the PDCP data packet, the RLC layer further analyzes the priority of the received PDCP data packet, and the high priority TCP ACK is parsed. Packets are assigned to logical channels with high priority. As shown in Figure 1, the specific processing steps are as follows:

Step 101: The PDCP layer receives the IP data stream sent by the IP layer, and determines whether the currently received IP data packet is a TCP ACK packet. If yes, go to step 102; otherwise, go to step 103.

The user interface protocol stack of the air interface is divided into: a PDCP layer, an RLC layer, a media access control protocol (MAC) layer, and a physical (PHY) layer. Figure 2 is a schematic diagram of the distribution structure and corresponding relationship between the protocol layers between the user terminal (UE) and the UTRAN in the air interface protocol stack. As any data transmission of the communication system depends on the support of the various protocol layers, based on the above-mentioned protocol stack structure, during the uplink data transmission process, the PDCP layer first compresses the IP data packets issued by the IP layer on the UE side. Get the PDCP data packet, and then send the PDCP data packet to the RLC layer; the RLC layer performs fragmentation and concatenation on the received PDCP data packet to obtain the RLC data packet and send it to the MAC layer; the MAC layer according to the current RLC data packet and the configured TFCS selects the appropriate transmission format combination (TFC); finally, the PHY layer sends the data packet to the UTRAN side after encoding and modulation according to the selected TFC; on the UTRAN side, the data packet passes through the PHY layer, After the MAC layer, RLC layer and PDCP layer perform demodulation, decoding, recombination, data recombination and decompression, the IP data packet sent by the UE is obtained and sent to the IP layer of the UTRAN layer. The downlink data transmission is opposite to the uplink data transmission process, and the UE is replaced with UTRAN and the UTRAN is replaced with UE in the uplink data transmission process.

Because the PDCP layer mainly completes the functions of data aggregation and sending and compressing the TCP / IP data packet header. In this layer, the data packet header of the IP data packet issued by the IP layer is read first, and then the compression processing of the TCP / IP data packet header is performed. It is then sent to the LC layer. So here's the Both the TCP and IP data packet headers are visible, and it can be determined whether the IP data packet is a TCP ACK data packet during the PDCP layer reading the IP data packet header.

According to the description of each protocol layer in the air interface protocol stack, it can be seen that the PDCP layer can analyze and process IP data packets on both the UTRAN side and the UE side. Therefore, after receiving the IP data packet, the PDCP layer can Whether the flag bit identifying the ACK data packet in the TCP data packet header is valid, to determine whether the IP data packet is a TCP ACK data packet.

Step 102: The PDCP layer identifies the IP data packet as a data packet with a high priority, and executes Step 104.

Step 103: The PDCP layer identifies the IP data packet as a low-priority data packet.

Step 104: The PDCP layer performs an existing PDCP function processing on the data packet to obtain a PDCP data packet, and then sends it to the RLC layer. Here, the existing PDCP function processing is the compression processing of the TCP / IP data packet header after reading the data packet header.

Step 105: The RLC layer receives the PDCP data packet sent by the PDCP layer, analyzes the priority of the PDCP data packet, and performs the existing RLC function processing to obtain the RLC data packet. The existing RLC function processing described here is to perform processing such as fragmentation and concatenation on data packets.

The PDCP layer sends the data packet to the RLC layer through the RLC-AM-DATA-Req primitive. After receiving the data packet, the RLC layer first analyzes the primitive sent by the higher layer to process the data packet accordingly, so In step 102 or step 103, the PDCP layer identifies the priority of the data packet by adding a cell identifying the priority of the data packet to the primitive; then in step 105, the RLC layer analyzes The primitive learns the priority of the data packet. If the cell identifying the priority of the data packet in the primitive indicates that the priority is high, the data packet is a high priority data packet; otherwise, the data packet is a low priority data packet. data pack. Here, the present invention can adopt various methods for identifying and identifying the priority of a data packet, and is not limited to the manner described in this paragraph. Since the process of identifying how to identify the priority of a data packet is not a problem addressed by the present invention, This article will not go into details about other methods. Step 106: The RLC layer judges whether the RLC data packet is a data packet with a high priority, and if so, proceeds to step 107; otherwise, proceeds to step 108. Since the RLC layer already knows the priority of the data packet in step 105, the priority of the RLC data packet can be determined here.

Step 107: The RLC layer sends the RLC data packet to a logical channel with a higher priority, and ends the current processing.

Step 108: The RLC layer sends the RLC data packet to a logical channel with a lower priority, and ends the current processing.

Because in the current air interface protocol specification, one RLC layer can correspond to two logical channels, and when the MAC layer performs scheduling according to the logical channel priority, it will first schedule the logical channel with the higher priority for processing. Therefore, in this embodiment, the TCP ACK. Data packet is identified as a data packet with high priority in step 102, and the TCP ACK data packet with high priority is sent to the priority in step 107. High logical channel. In this way, the air interface can send TCP ACK data packets first to ensure that the TCP sender can get ACK data packets within a small delay.

Step 101 to step 108 are processing for one data packet. In this embodiment, each of the data packets sequentially delivered from the IP layer to the PDCP layer and the RLC layer is processed as described above, and at the UE side of the air interface and The PDCP layer and RLC layer on the UTRAN side both perform the processing described in Figure 1. In this way, each TCP ACK packet sent on the UE side and the UTRAN side will be assigned to a logical channel with a higher priority, so that it is processed preferentially. .

In the above scheme, the data flow is processed at the PDCP layer and the RLC layer, so that the MAC layer can send TCP ACK packets preferentially, which basically guarantees that TCP ACK packets will not be transmitted when data is transmitted in both uplink and downlink. Non-TCP ACK packets are blocked on the air interface, reducing the delay of TCP ACK packet reply, which can basically prevent the TCP layer data transmission from entering the congested state and enable the TCP sender to enable the congestion mechanism. In this way, the efficiency of uplink and downlink bidirectional data transmission is guaranteed, thereby greatly improving the matching of the air interface and the TCP transmission mechanism. Timely data transmission performance.

FIG. 3 is a schematic diagram of a processing flow of a second preferred embodiment of the method of the present invention. In this embodiment, the PDCP layer directly performs the existing PDCP function processing on the TCP ACK data packet. At the same time, the PDCP layer performs flow control on the non-TCP ACK data packet according to the air interface data transmission performance obtained by the PDCP layer, and then performs Processing of existing PDCP functions. As shown in Figure 3, the specific processing steps are as follows:

Step 301: The PDCP layer receives a piece of data stream sent by the IP layer, analyzes each IP data packet in the data stream, and determines whether the currently received IP data packet is a TCP ACK packet, and for all eligible IPs The data packet is a TCP ACK data packet, and step 305 is performed; for all IP packets that do not meet the conditions, that is, a non-TCP ACK data packet, step 302 is performed.

Step 302: The PDCP layer buffers the IP data packet.

Step 303: The PDCP layer acquires air interface data transmission performance, and judges whether the air interface is congested according to the acquired air interface data transmission performance, and if so, ends the current processing; otherwise, execute step 304.

It can be seen in this step that the method for performing flow control according to the data transmission performance of the air interface in this embodiment is: ■ When the air interface is congested, the IP data packet is buffered and not processed until the air interface is not congested, and then the cached IP data packet is read. For processing.

Among them, the air interface data transmission performance needs to be calculated through various data transmission parameters monitored from the air interface. There are basically two methods for obtaining air interface data transmission performance described in this step: 1. The function of using the Media Transmission Control Protocol (MAC) layer to monitor air interface data transmission parameters, and the MAC layer reports its monitored air interface data transmission parameters to PDCP. Layer, and then the PDCP layer calculates the air interface data transmission performance according to the received air interface data transmission parameters; 2. The MAC layer monitors the air interface data transmission parameters and calculates the air interface data transmission performance, and then reports the air interface data transmission performance calculated by itself. To the PDCP layer. The air interface transmission performance described in this embodiment may only include an air interface congestion indication. Because the MAC layer can monitor air interface data transmission parameters such as the current maximum transmission rate of the MAC layer, that is, the air interface rate, and the amount of data cache in the RLC layer. Therefore, the method for obtaining the air interface congestion indication can be: According to the air interface rate and the amount of data buffering at the RLC layer, the minimum time for data packets to be buffered at the RLC layer can be obtained; and then based on the minimum time for buffering the data packets and the preset congestion determination time The threshold determines whether the air interface is congested: If the minimum time for data packets buffered in the RLC layer exceeds this congestion determination time threshold, the air interface can be determined to be congested, and the air interface congestion indicator is valid; otherwise, the air interface is not congested, and the air interface congestion indicator is invalid. Here, the setting of the congestion determination time threshold is related to the current specific service type, and the specific standard used to determine whether the air interface is congested is not limited to one type. For example, the rate can be used as a standard to measure whether the air interface is congested. Not limited.

Step 304: The PDCP layer reads the buffered IP data packet and sends it to its own PDCP function processing module. Here, the IP data packet may include the data packet buffered in step 302, and may also include the IP data packet stored before the PDCP layer.

In steps 302 to 304 of this embodiment, the IP data packet is a non-TCP ACK data packet.

Step 305: Perform PDCP function processing on the IP data packet, and end the current processing. Here, after being processed by the PDCP function, the IP data packet will be delivered to the RLC layer for the existing corresponding subsequent processing, and finally sent to the air interface.

The acquired air interface data transmission performance may include an air interface congestion indication, and may further include an air interface rate. The PDCP layer may send an IP data packet to the PDCP function processing module at the air interface rate, so that the data rate arriving at the air interface is in line with the actual data rate. The air interface rate basically matches. In addition, when judging air interface congestion, it may further issue a number of packets at a rate lower than the current air interface rate, that is, in step 303, when judging air interface congestion, it further includes reading the buffered IP data packet, The read IP data packet is less than the air interface rate A certain rate is sent to the PDCP function processing module, so that the congestion of the air interface is gradually alleviated and eventually eliminated, but the value of the specific rate is determined by the actual situation, and the invention is not limited. Here, there are various criteria for determining the IP packet delivery rate when judging the occurrence of air interface congestion. The delivery rate determined by these criteria will alleviate the congestion of the air interface, but which criteria are specifically used to determine whether the delivery rate does not It is the focus of the present invention and will not be described in detail here.

In addition, the acquired air interface data transmission performance may also be only the air interface rate. Then, the method for the PDCP layer to perform flow control according to the obtained air interface rate is to: buffer the IP data packets issued by the IP layer, read the buffered IP data packets, and send them to the PDCP function processing module at the air interface rate.

For the processing of the IP data flow, in this embodiment, the processing described in step 301 to step 305 is performed for each piece of data flow delivered by the IP layer, and the PDCP layer and the RLC layer on the UE side and the UTRAN side of the air interface are performed. The processing described in FIG. 3, in this way, at the UE side and the UTRAN side, the PDCP layer can directly process the existing PDCP function for each TCP ACK packet sent by the IP layer, and then send it to the lower layer, so that the TCP ACK data The packet can be sent to the TCP sender corresponding to the non-TCP ACK data packet with a small delay, so that the TCP sender's rate remains stable; at the same time, the MAC layer continuously monitors the air interface data transmission parameters so that the PDCP layer can The air interface data transmission parameters obtain the air interface data transmission performance, so that the non-TCP ACK data packets sent by each IP layer are flow controlled, so that the data rate arriving at the air interface basically matches the actual air interface rate, which basically guarantees that no air interface congestion will occur Case.

FIG. 4 is a schematic diagram of a processing flow of a third preferred embodiment of the method of the present invention. In this embodiment, a portable machine connected to the UE and the network host side is used to intercept the IP data stream, and the portable machine analyzes the intercepted IP data stream and sends the TCP ACK data packet directly to the respective connected UE and Network host, buffer non-TCP 妁 ACK data packets and use current air interface speed Rate to send non-TCP ACK packets back to the respective connected UEs and network hosts. In FIG. 4, only the UE-side processing is used as an example for description. As shown in FIG. 4, the specific processing steps are as follows: Step 401: The portable computer connected to the UE intercepts an IP layer data stream from the UE, analyzes each IP data packet in the data stream, and judges: the currently received IP Whether the data packet is a TCP ACK data packet, the portable computer sends all IP data packets that meet this condition back to the UE, and then executes step 404; performs step 402 for all IP data packets that do not meet this condition.

Step 402: The portable computer buffers the IP data packet. The IP packet here is a non-TCP ACK packet.

Step 403: The portable computer sends the buffered IP data packet back to the UE at the current air interface rate. Here, the air interface rate is an air interface rate of a UE to which the portable machine is currently connected, which is preset in the portable machine.

Step 404: The PDCP layer of the UE performs the existing PDCP function processing on these IP data packets, and ends the current processing. Here, after the IP data packet is processed by the PDCP function, it will be delivered to the RLC layer for the existing corresponding subsequent processing, and finally sent to the air interface.

The processing described in the above steps 401 to 404 is the processing of a piece of IP data flow delivered by the intercepted IP layer by the portable computer. In this embodiment, steps are performed for each piece of data flow delivered from the IP layer on the UE side. 401 to 404. In addition, the processing principle of this embodiment is described above by taking the data processing flow of the portable machine connected to the UE as an example. In this embodiment, the processing process of the portable machine connected to the network host is also connected to the processing process of the portable machine connected to the network host. The process described in steps 401 to 404 is basically the same, and only the UE in the above steps is replaced with a network host.

According to FIG. 4, it can be seen that the portable computer can send the TCP ACK data packets sent by each IP layer preferentially, and perform flow control on the non-TCP ACK data packets sent by each IP layer, so that the non-TCP ACK The data packet is sent back to the UE or the network host at the current air interface rate. In this way, TCP ACK data packets are prevented from being blocked by non-TCP ACK data packets on the air interface. The response delay of the ACK data packet is greatly reduced, and the stable sending rate of the TCP sender is ensured; and the non-TCP ACK data packet is flow-controlled to be sent to the lower layer at the current air interface rate, which can enable the data rate to the air interface. It is basically consistent with the current actual air interface rate, thereby improving data transmission efficiency.

In summary, the user plane data processing method provided by the present invention can preferentially send a TCP ACK data packet to a corresponding TCP sender when the air interface and the TCP transmission mechanism are combined for data transmission, so that the TCP ACK The response delay of the data packet is greatly reduced, ensuring a stable user-plane data transmission rate, thereby significantly improving the user-plane data transmission performance.

The above descriptions are merely preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims

Claim

1. A user plane data processing method for processing each IP data packet delivered from the IP layer of an air interface protocol stack, characterized in that the method includes:

a. Determine whether the currently received IP data packet is an acknowledgement ACK data packet of the Transmission Control Protocol TCP, and if so, perform step b; otherwise, perform flow control on the IP data packet;

b. Process the IP data packet to obtain a packet data convergence protocol PDCP data packet.

2. The method according to claim 1, wherein, in step a, when determining that the packet is an ACK packet of TCP, the method further comprises: identifying the IP data packet as a high priority; the flow control in step a Is: identifying the IP data packet as a low priority;

After step b, the method further includes: the radio link control protocol RLC layer processes the PDCP data packet to obtain an RLC data packet, and determines whether the obtained RLC data packet is a high-priority data packet; if it is, the RLC data is The packet is allocated to a logical channel with a high priority; otherwise, the RLC data packet is allocated to a logical channel with a low priority.

3. The method according to claim 1, further comprising: obtaining, by the PDCP layer, current air interface data transmission performance; and in step a, performing flow control according to the obtained air interface data transmission performance.

4. The method according to claim 3, wherein the air interface data transmission performance can include an air interface congestion indication;

The flow control in step a is: the PDCP layer buffers IP data packets; determines whether the air interface is congested according to whether the obtained air interface congestion indication is valid, and if so, ends the current processing; otherwise, the buffered IP data packet is read and sent to PDCP Functional processing module.

5. The method according to claim 4, wherein the air interface data transmission performance further comprises: an air interface rate;

In the flow control in step a, the sending the IP data packet to the PDCP function processing module is: sending the IP data packet at the obtained air interface rate.

6. The method according to claim 5, wherein, in the flow control in step a, when determining the air interface is congested, further comprising: reading the buffered IP data packet at a rate lower than the air interface rate. Send the IP data packet to the PDCP function processing module, and execute step b.

7. The method according to claim 3, wherein the air interface data transmission performance is an air interface rate;

In step a, the flow control is: the PDCP layer buffers the IP data packet, reads the buffered IP data packet, and sends the IP data packet to its own PDCP function processing module at the acquired air interface rate.

8. The method according to any one of claims 3 to 7, wherein the method for obtaining air interface data transmission performance is: a media access control protocol (MAC) layer calculates air interface data transmission based on the monitored air interface data transmission parameters. Performance and report to the PDCP layer.

9. The method according to any one of claims 3 to 7, wherein the method for obtaining air interface data transmission performance is: a MAC layer reports a monitored air interface data transmission parameter to a PDCP layer, and the PDCP layer according to the Air interface data transmission parameters are calculated to obtain air interface data transmission performance.

10. The method according to claim 1, further comprising: connecting a portable machine on the UE side and the network host side of the user equipment, and each portable machine intercepting an IP data packet from the UE and the network host respectively; each The portable machine separately performs the processing described in step a on the intercepted IP data packets;

After step a, the method further includes: the portable computer sends the intercepted IP data packet back to the PDCP layer of the UE or the network host connected to it.

11. The method according to claim 10, further comprising: setting the air interface rate of each connected UE or network host in each portable machine;

In step a, the flow control is: the portable computer buffers the IP data packet, and adjusts the rate at which the buffered IP data packet is sent back to the UE or the network host to the set air interface rate.