WO2016155292A1

WO2016155292A1 - Method and device for acquiring transmission delay between access technology networks

Info

Publication number: WO2016155292A1
Application number: PCT/CN2015/092446
Authority: WO
Inventors: 贺美芳; 黄河
Original assignee: 中兴通讯股份有限公司
Priority date: 2015-03-31
Filing date: 2015-10-21
Publication date: 2016-10-06
Also published as: CN106162685A; CN106162685B

Abstract

A method and device for acquiring transmission delay between access technology networks. The method comprises: a terminal receives a data packet from a first access technology network and transmitted by a second access technology network, and acquires first time information when the data packet is added to the first access technology network from the received data packet; and calculate, according to the acquired first time information and second time information about the first access technology network when the terminal receives the data packet, information about transmission delay of the data packet. The technical solution of the present invention is capable of acquiring the transmission delay between access technology networks, thereby providing a technical guarantee for preventing the problem of transmission delay of data units and a queuing phenomenon.

Description

Method and device for acquiring transmission delay between access technology networks

Technical field

This document relates to the technical field of obtaining transmission delay between access technology networks, and in particular, to a method and device for obtaining transmission delay between access technology networks.

Background technique

With the continuous evolution of wireless communication technologies and standards, mobile packet services have been greatly developed, and the data throughput capability of single terminals has been continuously improved. Taking the Long Term Evolution (LTE) system as an example, data transmission with a maximum downlink rate of 100 Mbps can be supported in a 20M broadband. In the subsequent enhanced LTE (LTE Advanced) system, the data transmission rate will be further improved, and even 1Gbps.

The inflated growth of terminal data traffic has made the network resources of related technologies gradually unsatisfactory, especially in the case that the next-generation communication technologies (such as 3G and LTE) cannot be widely deployed, and the user rate cannot be met. And traffic demand, resulting in a worse user experience. How to prevent and change this situation is an issue that operators must consider. On the one hand, it is necessary to speed up the promotion of new technologies and network deployment. On the other hand, it is hoped that the related technology networks and technologies can be enhanced to achieve rapid improvement of network performance. purpose. As is well known, in addition to the wireless network technology provided by the 3rd Generation Partnership Project (3GPP), wireless local area networks (WLANs), especially based on electrical and electronic engineers, have been widely used. Wireless LANs of the IEEE (Institute of Electrical and Electronics Engineers) 802.11 standard have been widely used in hotspot access coverage in homes, businesses, and even the Internet. Among them, the technical specifications proposed by the Wi-Fi Alliance are the most widely used. Therefore, in practice, WiFi networks are often equated with WLAN networks based on the IEEE 802.11 standard.

Under this premise, some operators and companies have proposed to integrate WLAN with related technology 3GPP networks to achieve joint transmission to achieve load shunting and improve network performance. The 3GPP SA2 provides a mode for selecting a target access network for a terminal according to an operator policy through an Access Network Discovery and Selection Functions (ANDSF) scheme.

The 3GPP version 10 (R10) defines the ANDSF standard. The ANDSF acts as an access anchor to implement intelligent network selection. Through the interaction between the network and the terminal, the network access is effectively offloaded, which is in line with the future multi-network coordinated operation direction. The ANDSF formulates policies based on information such as network load, terminal capabilities, and user subscriptions to help end users select the best access network standard and implement coordinated operation of multiple access modes. ANDSF can be deployed separately or in combination with other network elements. At present, the mainstream view of the industry is that ANDSF can be deployed on PCC devices (Policy Control and Charging).

ANDSF is a WLAN interworking scheme based on the core network, and does not consider the impact on the access network. In addition, since the ANDSF is a relatively static scheme, the network load and channel quality cannot be dynamically changed. Adaptation is therefore carried out, so a WLAN interworking discussion is also carried out on the 3GPP access network. In Release 12 (R12) WLAN/3GPP wireless interoperation, a mechanism for performing WLAN offloading rules and triggering is introduced.

However, the core network mechanism and the auxiliary information mechanism from the radio access network cannot provide real-time usage load and channel conditions to the network side to combine the use of radio resources. In addition, data from the same bearer cannot be served on both 3GPP and WLAN links. Therefore, the need for WLAN integration with 3GPP networks was reintroduced at the RAN65 subliminal.

Compared with the WLAN offloading scheme that has been studied and relies on policy and triggering, the WLAN (Radio Access Network) hierarchically aggregated WLAN is integrated with the 3GPP network, and the WLAN and the 3GPP network are closely coupled, similar to carrier aggregation and dual. Connections provide better control and utilization of resources for dual connectivity for the overall system. Tight integration and aggregation at the wireless layer allows for more real-time joint scheduling of WLANs and radio resources of the 3GPP network, thus providing QoS, Quality of Service and tidying system capacity. By better managing the wireless resources between users, the collective throughput of all users can be increased and the overall system capacity can be provided. Based on real-time channel conditions and system usage, each link scheduling decision can be made to the level of each packet. The user plane is anchored to a reliable LTE network and can be improved by rolling back to the LTE network.

The close coupling between the WLAN and the 3GPP network can be applied to the same-speech writing scenario (the eNB (Evolved Node B) and the access point (AP, Access Point) complete the RAN layer integration operation through the internal interface and are physically integrated. In essence, similar to 3GPP carrier aggregation, the scenario is usually a small cell) and a non-co-location scenario (the RAN layer is completed between the eNB and the AP through an external interface). Integration operations are essentially similar to dual connectivity). 1(a) is a schematic diagram of a related art cooperation scheme applied to a WLAN and a 3GPP integrated base station site; FIG. 1(b) is a schematic diagram of a non-cooperative cooperation scheme of the related art applied to an ideal loop-connected WLAN and a 3GPP network. FIG. 2 is a schematic diagram of a scenario in which a related art cooperation scheme is applied to a small cell (Nano Cell) layout.

There are four types of WLAN offloading schemes for WLAN and 3GPP networks: the simplified packet data convergence protocol (PDCP) layer splitting, the dual connectivity architecture PDCP layer shunting, and the radio link control (RLC, Radio Link Control). Layer shunt, media access control (MAC, Media Access Control) layer shunt.

The simplified architecture PDCP layer is offloaded. The WLAN offload of the downlink data stream is completed at the PDCP layer of the 3GPP access network, and then transmitted to the WLAN offloaded PDCP adapter. The WLAN offloaded PDCP adapter completes the 3GPP PDCP protocol data unit to the WLAN MAC protocol data. The conversion of the unit is sent to the MAC layer of the WLAN of the terminal through the wireless air interface of the WLAN, and then sent to the PDCP adapter of the terminal, and the PDCP adapter of the terminal completes the conversion of the WLAN MAC protocol data unit to the PDCP protocol data unit, and then sends the signal to the PDCP protocol data unit. The PDCP entity of the user equipment (UE), and finally, the PDCP entity sends the PDCP service data unit to the corresponding application service. The uplink data stream is sent from the PDCP entity of the terminal to the PDCP entity of the 3GPP access network, which is similar to the downlink process except that the direction is reversed, and thus will not be described herein.

The dual connectivity architecture PDCP layer is offloaded, and the data is divided twice. First, the PDCP layer of the 3GPP access network distributes the data stream to the RLC layer of the small cell of the secondary base station, and then the second downlink data stream in the MAC of the small cell. The offloading, that is, the WLAN offloading to the MAC adapter, the MAC adapter completes the conversion of the 3GPP MAC protocol data unit to the WLAN MAC protocol data unit, sends the MAC layer of the WLAN through the WLAN wireless air interface to the terminal, and then sends the MAC adapter to the terminal. The MAC adapter of the terminal completes the conversion of the WLAN MAC protocol data unit of the WLAN to the RLC protocol data unit of the terminal, and then sends the RLC entity to the terminal, and the RLC entity of the terminal completes the conversion of the RLC protocol data unit to the PDCP protocol data unit of the terminal, Then, the PDCP entity is sent to the terminal, and finally the PDCP entity sends the user data unit to the corresponding application service according to the 3GPP air interface protocol. The uplink data flow is similar to the downlink process, but the direction is reversed, so it will not be described here.

The RLC layer is offloaded, and the WLAN offload of the downlink data stream is in the RLC layer of the 3GPP access network. After completion, the RLC adapter is transmitted to the WLAN offload, and the WLAN offloaded RLC adapter completes the conversion of the 3GPP RLC protocol data unit to the WLAN MAC protocol data unit, and sends the wireless air interface of the WLAN to the MAC layer of the WLAN of the terminal, and then sends the packet. To the RLC adapter of the terminal, the RLC adapter of the terminal completes the conversion of the WLAN MAC protocol data unit of the WLAN to the RLC protocol data unit of the terminal, and then sends the RLC entity to the terminal, and the RLC entity of the terminal completes the PDCP protocol of the RLC protocol data unit to the terminal. The conversion of the data unit is then sent to the PDCP entity of the terminal. Finally, the PDCP entity sends the PDCP service data unit to the corresponding application service. The uplink data flow is similar to the downlink process, but the direction is reversed, so it will not be described here.

The so-called MAC layer offloading, the WLAN offload of the downlink data stream is completed in the MAC layer of the 3GPP access network, and then transmitted to the WLAN offloaded MAC adapter, and the WLAN offloaded MAC adapter completes the 3GPP MAC protocol data unit to the WLAN MAC protocol data unit. The conversion is sent to the MAC layer of the WLAN of the terminal through the wireless air interface of the WLAN, and then sent to the MAC adapter of the terminal, and the MAC adapter of the terminal completes the conversion of the MAC protocol data unit of the WLAN to the MAC protocol data unit of the terminal, and then sends the signal to the MAC protocol data unit of the terminal. The MAC entity of the terminal, the MAC entity of the terminal completes the conversion of the MAC protocol data unit to the PDCP protocol data unit of the terminal, and then sends the PDCP entity to the terminal. Finally, the PDCP entity sends the service data unit of the PDCP to the corresponding application service. The uplink data flow is similar to the downlink process, but the direction is reversed, so it will not be described here.

Currently, PDCP layer PDCP service data unit (SDU) discarding of LTE is performed by the discard timer function and PDCP status report feedback, thereby preventing transition delay and queuing of the transmission branch. The timer-based discarding function starts the discarding timer when the PDCP layer receives each PDCP SDU from the upper layer. When the PDCP layer does not successfully transmit the PDCP SDU, the terminal discards the PDCP SDU. The PDCP status report confirms that the PDCP SDU is successfully transmitted, and the terminal also discards the PDCP SDU. If the terminal does not discard the corresponding PDCP SDU in time, it will cause congestion in data transmission. In addition, in order to meet the QoS required by the service, the drop timer needs to be set to an appropriate value.

For tightly coupled LTE offloading to WLAN networks, there is currently no effective way to prevent data transmission delays and queuing. However, in order to prevent the transmission of data units Delay problem and queuing phenomenon need to know more transmission status of WLAN network, such as delay time difference between networks. Therefore, you can adjust the transmission or discard of data units between networks by setting the discard timer function or according to the delay time difference. However, for the tightly coupled LTE offloading to the WLAN network, the related art does not provide a calculation scheme of the delay time difference between the networks, and therefore, the delay time difference between transmissions between the networks cannot be known.

Summary of the invention

The technical problem to be solved by the present invention is to provide a method and a device for acquiring transmission delay between access technologies, which can know the transmission delay between access technology networks, and provide a technique for preventing transmission delay and queuing of data units. Guarantee.

In order to achieve the above technical purpose, the following technical solutions are adopted:

A method for obtaining transmission delay between access technology networks, comprising:

Receiving, by the terminal, a data packet from the first access technology network that is transmitted through the second access technology network, and acquiring, from the received data packet, the first time information when the data packet is added to the first access technology network. ;

The terminal calculates the transmission delay information of the data packet according to the obtained first time information and the second time information of the first access technology network when the terminal receives the data packet.

Optionally, the data packet includes:

The radio link controls the RLC layer protocol data unit; or,

Media access control MAC layer protocol data unit; or,

Packet data convergence protocol PDCP layer protocol data unit; or,

a second access technology network adaptation layer protocol data unit, where the second access technology network adaptation layer is located above the MAC layer or the physical PHY layer of the second access technology network, and is located at the first A user plane entity below the PDCP layer, the RLC layer, or the MAC layer of the access technology network.

Optionally, the first time information includes:

a system frame number SFN of the first access technology network and a subframe number of the first access technology network; or

The SFN of the first access technology network.

Optionally, the second time information includes an SFN of the first access technology network and a subframe number of the first access technology network, or an SFN of the first access technology network.

Optionally, the first time information includes:

Time information in the first access technology network when the data packet is generated; or

Time information in the first access technology network when the data packet is first transmitted to the second access technology network; or

Time information in the first access technology network when the data packet arrives at the first access technology network.

Optionally, the second time information includes:

Time information in the first access technology network when the physical layer of the terminal receives the data packet; or

Time information in the first access technology network when the corresponding user plane of the terminal receives the data packet; or

Time information in the first access technology network when the corresponding user plane entity of the terminal processes the data packet; or

The time information in the first access technology network when the corresponding user plane entity of the terminal submits the data packet to a higher layer.

Optionally, the step of the terminal acquiring the first time information when the data packet is added to the first access technology network from the received data packet includes:

The terminal decodes the received data packet, and acquires the first time information from the header information of the data packet.

Optionally, the step of the terminal calculating the transmission delay information of the data packet according to the obtained first time information and the second time information of the first access technology network when the terminal receives the data packet include:

And determining, by the terminal, the transmission delay information of the data packet according to the difference between the second time information of the first access technology network and the obtained first time information when the terminal receives the data packet.

Optionally, when the first time information and the second time information both comprise the first access technology network The SFN and the subframe number, the calculating the transmission delay of the data packet according to the obtained first time information and the second time information of the first access technology network when the terminal receives the data packet The steps of the information include:

Calculating the transmission delay information of the data packet according to the formula: [(1024+SFN2-SFN1)MOD 1024]*10+[(subframe2–subframe1) mod 10],

The SFN1 represents an SFN included in the first time information, the SFN2 represents an SFN included in the second time information, the subframe1 represents a subframe number included in the first time information, and the subframe2 represents The subframe number included in the second time information.

Optionally, when the first time information and the second time information both include an SFN of the first access technology network, the receiving, according to the obtained first time information, and the terminal, The step of calculating the transmission delay information of the data packet by the second time information of the first access technology network in the data packet includes:

Calculating the transmission delay information of the data packet according to the formula [(1024+SFN2-SFN1) MOD 1024]*10,

The SFN1 represents an SFN included in the first time information, and the SFN2 represents an SFN included in the second time information.

A device for obtaining a transmission delay between access technologies, is disposed in a terminal, and includes an obtaining module and a computing module, where:

The acquiring module is configured to: receive a data packet from the first access technology network transmitted via the second access technology network, and obtain the data packet from the received data packet to join the first access First time information when the technology network is available;

The calculating module is configured to: calculate the data according to the first time information obtained by the acquiring module and the second time information of the first access technology network when the terminal receives the data packet Packet transmission delay information.

Optionally, the calculating module is configured to calculate the transmission of the data packet according to the obtained first time information and the second time information of the first access technology network when the terminal receives the data packet Delay information:

And determining a transmission delay information of the data packet according to a difference between the second time information of the first access technology network and the obtained first time information when the terminal receives the data packet.

Optionally, when the first time information and the second time information both include the SFN and the subframe number of the first access technology network, the calculating module is configured to obtain the first time information and the location according to the following manner. Transmitting the delay information of the data packet by using the second time information of the first access technology network when the terminal receives the data packet:

Calculating the transmission delay information of the data packet according to the formula [(1024+SFN2-SFN1)MOD 1024]*10+[(subframe2–subframe1)MOD 10],

Optionally, when the first time information and the second time information both include the SFN of the first access technology network, the calculating module is configured to: when the terminal receives the data packet, the first connection according to the following manner Determining the transmission delay information of the data packet by using a difference between the second time information of the incoming technical network and the obtained first time information:

Calculating transmission delay information of the data packet according to the formula [(1024+SFN2-SFN1)MOD 1024]*10, wherein the SFN1 represents an SFN included in the first time information, and the SFN2 represents the first The second time information contains the SFN.

Compared with the related art, the technical solution provided by the present invention includes: receiving, by a terminal, a data packet from a first access technology network transmitted through a second access technology network, and acquiring a data packet from the received data packet to join the first The first time information when accessing the technology network; calculating the transmission delay information of the data packet according to the obtained first time information and the second time information of the first access technology network when the terminal receives the data packet. In this way, the transmission delay between the access technology networks is known, which provides a technical guarantee for preventing the transmission delay problem and the queuing phenomenon of the data unit, thereby helping to reduce data congestion during transmission and helping to satisfy the user. Feel.

BRIEF abstract

FIG. 1(a) is a schematic diagram of a related art cooperation scheme applied to a WLAN and a 3GPP integrated base station site;

FIG. 1(b) is a schematic diagram of a non-cooperative cooperation scheme of the related art applied to an ideal loop connected WLAN and a 3GPP network;

2 is a schematic diagram of a scenario in which a related-ground cooperation scheme of a related art is applied to a small cell layout;

FIG. 3 is a flowchart of a method for obtaining a transmission delay between access network networks according to a preferred embodiment of the present invention;

4 is a flowchart of Embodiment 1 of the present invention;

Figure 5 is a flowchart of Embodiment 2 of the present invention;

6 is a flowchart of Embodiment 3 of the present invention;

Figure 7 is a flowchart of Embodiment 4 of the present invention;

Figure 8 is a flowchart of Embodiment 5 of the present invention;

FIG. 9 is a schematic structural diagram of an apparatus according to an embodiment of the present invention.

Preferred embodiment of the invention

The following is an overview of the topics detailed in this document. This Summary is not intended to limit the scope of the claims.

The preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings.

FIG. 3 is a flowchart of a method for obtaining a transmission delay between access technologies by using an alternative embodiment of the present invention. As shown in FIG. 3, a method for obtaining a transmission delay between access network networks according to an alternative embodiment of the present invention includes:

Step 11: The terminal receives the data packet from the first access technology network transmitted via the second access technology network, and obtains the first time information when the data packet is added to the first access technology network from the received data packet.

The access technology network is the network system that the terminal accesses through the wireless air interface. Optionally, the even first access technology network may be, for example, an LTE system, an umts system, etc., and the second access technology network may be So as the WIFI system.

In this step, the first time information when the terminal acquires the data packet from the received data packet to join the first access technology network is specifically: the terminal decodes the received data packet, and obtains the information from the header information of the data packet. First time information.

In this step, when the terminal obtains the first time information when the data packet is added to the first access technology network from the received data packet, the data packet is:

The radio link controls the RLC layer protocol data unit; or,

Media access control MAC layer protocol data unit; or,

Packet data convergence protocol PDCP layer protocol data unit; or,

a second access technology network adaptation layer protocol data unit, where the second access technology network adaptation layer is located above the MAC layer or the physical PHY layer of the second access technology network, and is located in the first access technology network. User plane entity below the PDCP layer, RLC layer or MAC layer.

In this step, the first time information includes a system frame number SFN of the first access technology network and a subframe number of the first access technology network, or an SFN of the first access technology network.

In this step, the first time information is:

Time information in the first access technology network when generating a data packet; or

Step 12: The terminal acquires second time information of the first access technology network when receiving the data packet.

In this step, the second time information includes a system frame number SFN of the first access technology network and a subframe number of the first access technology network, or an SFN of the first access technology network.

The step specifically includes: the terminal obtains the upper 8 bits of the SFN of the first access technology network by detecting the physical broadcast channel (PBCH), obtains the lower 2 bits of the SFN through the PBCH blind check, and obtains the SFN; the terminal physical layer maintains itself. The subframe number is reported to the upper layer.

In this step, the second time information is:

Time information in the first access technology network when the corresponding user plane receives the data packet; or

Time information in the first access technology network when the corresponding user plane entity processes the data packet; or

The time information in the first access technology network when the corresponding user plane entity submits the data packet to the upper layer.

It should be noted that the acquisition of the first time information and the second time information in

steps

11 and 12 is not strictly chronological, as long as the terminal receives the transmission from the first access technology network via the second access technology network. The data package is fine.

Step 13: Calculate transmission delay information of the data packet according to the obtained first time information and the second time information.

The step is specifically: determining the transmission delay information of the data packet according to the difference between the second time information and the first time information.

Specifically, when the first time information and the second time information both include the SFN and the subframe number of the first access technology network, according to [(1024+SFN2-SFN1)MOD 1024]*10+[(subframe2–subframe1) MOD 10], calculating transmission delay information of the data packet, wherein SFN1 represents the SFN included in the first time information, SFN2 represents the SFN included in the second time information, subframe1 represents the subframe number included in the first time information, and subframe2 represents The subframe number included in the second time information.

Where MOD represents a remainder operation, the above calculation formula is: first calculating the sum of the difference between the SFN included in the second time information and the SFN included in the first time information and the sum of 1024, and then calculating the sum value and the remainder of 1024 a product of 10, calculating a difference between a subframe number included in the second time information and a subframe number included in the first time information, and calculating a remainder of the difference and 10, adding the remainder to the product to obtain delay information .

When the first time information and the second time information both include the SFN of the first access technology network, the transmission delay information of the data packet is calculated according to [(1024+SFN2-SFN1)MOD 1024]*10, where SFN1 represents The SFN included in the first time information, SFN2 represents the SFN included in the second time information.

Wherein, MOD represents a remainder operation, and the above calculation formula is: calculating a sum of a difference between the SFN included in the second time information and the SFN included in the first time information and a value of 1024, and then calculating the sum value and The product of the remainder of 1024 is the product of 10, and the resulting product is the delay information.

In addition, in an optional embodiment, the average value of the transmission delay information of the multiple data packets may be calculated according to the calculated transmission delay information of each data packet, or the transmission delay information exceeds a certain threshold. The number and proportion of data packets are reported by the terminal to the first access technology network. In this way, the first access technology network is informed that the second access technology network is configured to delay the transmission of data packets, thereby providing technical guarantee for preventing data transmission delay and queuing, thereby helping to reduce data congestion during transmission. .

Next, an optional embodiment of the present invention will be described in detail. Herein, the embodiment of the present invention is described by taking an LTE system and a WLAN tightly coupled as an example. The general mobile communication system (UMTS, Universal Mobile Telecommunications System) has the same implementation principle and will not be described again.

Specifically, in the embodiment of the present invention, the UE is in a WLAN/LTE integrated base station site, and both the UE and the integrated base station site support a WLAN and WLAN tightly coupled WLAN offloading scheme. The same applies to scenarios where the ideal connection between the WLAN and the 3GPP network and the tight coupling of the dual-connected small cell to the WLAN.

In this case, according to the difference of the WLAN offloading position that is closely coupled to the WLAN by the 3GPP access network, the following describes the four WLAN offloading schemes described in the background. The first access technology network is defined as system 1, and the second access technology network is defined as system 2.

4 is a flow chart of Embodiment 1 of the present invention. In the first embodiment, the PDCP layer shunting in the simplified architecture in the background is used as an application scenario. In this case, the data packet transmitted in the system 2 is a PDCP layer protocol data unit (PDU), and the header information of the PDCP layer protocol data unit is used. Get the first time information.

As shown in FIG. 4, the steps of the first embodiment are described in detail below:

Step 101: When the PDCP SDU of the system 1 encapsulates the PDCP SDU of the terminal into the PDCP PDU, the timestamp (first time information) of the current system is added to the header information of the data packet, and is sent to the PDCP adapter of the WLAN offload.

The timestamp includes the system frame number (SFN, System Frame Number) and the subframe number, or only the SFN.

Step 102: The PDCP PDU encapsulated by the WLAN is encapsulated into a PD PDU of the WLAN, and is sent to the WLAN offloaded PDCP adapter of the terminal side through the WLAN air interface.

Step 103: The PDCP adapter on the terminal side decodes the corresponding PDCP PDU and sends it to the PDCP entity of the terminal.

Step 104: The PDCP entity of the terminal decodes the PDCP PDU, and obtains the timestamp of the PDCP SDU and the data packet, and sends the timestamp to the RRC (Radio Resource Control) entity of the terminal.

Step 105: The RRC entity of the terminal acquires a timestamp (second time information) of the current cell (system 1).

The timestamp of the acquiring cell is SFN. Specifically, the terminal obtains the upper 8 bits of the system frame number by detecting the physical broadcast channel (PBCH), and the lower 2 bits need to be obtained during the PBCH blind check, that is, the cell is within 40 ms. The first few system frames transmit the Master Information Block (MIB), so that the lower 2 bits of the SFN are known. This SFN value is maintained by itself. In addition, the physical layer of the terminal can report the subframe number maintained by itself to the upper layer.

Step 106: The RRC entity of the terminal acquires transmission delay information of the data packet.

Specifically, the timestamp (first time information) in the data packet is compared with the timestamp (second time information) in the cell, and the difference between the two timestamps is obtained, and the data is determined according to the difference. Packet transmission delay information.

When the timestamp in the data packet and the timestamp in the cell include the SFN and the subframe number, according to [(1024+SFN2-SFN1)MOD 1024]*10+[(10+subframe2–subframe1)MOD 10] The calculation, wherein SFN1 represents the SFN included in the timestamp in the data packet, SFN2 represents the SFN included in the timestamp of the cell, subframe1 represents the subframe number included in the timestamp in the data packet, and subframe2 represents the timestamp of the cell. Subframe number, the unit of calculation result is ms.

When the timestamp in the data packet and the timestamp in the cell only contain the SFN, the calculation is performed according to [(1024+SFN2-SFN1)MOD 1024]*10, where SFN1 represents the SFN included in the timestamp in the data packet. SFN2 indicates the SFN included in the timestamp of the cell, and the unit of calculation result is ms.

FIG. 5 is a flowchart of Embodiment 2 of the present invention. In the second embodiment, the dual connection in the background art The PDCP layer is divided into the application scenario. In this case, the data packet transmitted in the system 2 is the PDCP layer protocol data unit of the primary base station, and the first time information is obtained in the header information of the PDCP layer protocol data unit.

As shown in FIG. 5, the steps of the second embodiment are described in detail below:

Step 201: The PDCP entity of the primary base station of the system 1 encapsulates the PDCP SDU of the terminal into the PDCP PDU, and adds the timestamp (first time information) of the current system to the header information of the data packet, and then the data is offloaded and transmitted to the primary base station of the system. RLC entity.

The timestamp contains the SFN and the subframe number, or only the SFN.

Step 202: The RLC entity of the base station of the system once encapsulates the PDCP PDU into an RLC PDU, and sends the signal to the WLAN offloaded MAC adapter.

Step 203: The WLAN offloaded MAC adapter encapsulates the RLC PDU as a WLAN MAC PDU, and sends the WLAN offloaded MAC adapter to the terminal side through the WLAN air interface.

Step 204: The MAC adapter on the terminal side decodes the corresponding RLC PDU and sends it to the RLC entity of the terminal.

Step 205: The RLC entity of the terminal decodes the PDCP PDU and transmits the PDCP PDU to the terminal.

Step 206: The PDCP entity of the terminal decodes the PDCP SDU, acquires the timestamp sent by the data packet, and saves the timestamp.

Step 207: The PDCP entity of the terminal acquires a timestamp (second time information) of the current cell.

Step 208: The PDCP entity of the terminal acquires transmission delay information of the data packet.

The method for calculating the timestamp of the current cell in step 207 and the method for calculating the transmission delay information in step 208 are the same as those in the first embodiment, and therefore are not described herein.

FIG. 6 is a flowchart of Embodiment 3 of the present invention. In the third embodiment, the MAC layer splitting in the background is used as an application scenario. At this time, the data packet transmitted in the system 2 is a MAC layer protocol data unit, and the first time is obtained in the header information of the MAC layer protocol data unit. information.

As shown in FIG. 6, the steps of the third embodiment are described in detail below:

Step 301: The MAC entity of system 1 encapsulates the MAC SDU of the terminal into a MAC PDU. At this time, the timestamp (first time information) of the current system 1 is added to the header information of the data packet, and is sent to the WLAN offloaded MAC adapter.

The timestamp contains the SFN and the subframe number, or only the SFN.

Step 302: The WLAN offloaded MAC adapter encapsulates the MAC PDU as a WLAN MAC PDU, and sends the WLAN offloaded MAC adapter to the terminal side through the WLAN air interface.

Step 303: The MAC adapter of the terminal decodes the corresponding MAC PDU and sends it to the MAC entity of the terminal.

Step 304: The MAC entity of the terminal decodes the MAC PDU, obtains the MAC SDU, acquires the timestamp sent by the data packet, and saves the timestamp.

Step 305: The MAC entity of the terminal acquires a timestamp (second time information) of the current cell.

Step 306: The MAC entity of the terminal acquires transmission delay information of the data packet.

The method for calculating the timestamp of the current cell in step 305 and the method for calculating the transmission delay information in step 306 are the same as those in the first embodiment, and therefore are not described herein.

FIG. 7 is a flowchart of Embodiment 4 of the present invention. In the fourth embodiment, the RLC layer shunting in the simplified architecture in the background is used as an application scenario. At this time, the data packet transmitted in the system 2 is an RLC layer protocol data unit, and the first information is obtained in the header information of the RLC layer protocol data unit. One time information.

As shown in FIG. 7, the steps of the fourth embodiment are described in detail below:

Step 401: When the RLC entity of the system 1 encapsulates the RLC SDU of the terminal into the RLC PDU, the timestamp (first time information) of the current system 1 is added to the header information of the data packet, and is sent to the WLAN offloaded RLC adapter.

The timestamp contains the SFN and the subframe number, or only the SFN.

Step 402: The WLAN offloaded RLC Adapter encapsulates the RLC PDU as a WLAN MAC PDU, and sends the WLAN offloaded RLC adapter to the terminal side through the WLAN air interface.

Step 403: The RLC adapter of the terminal decodes the corresponding RLC PDU and sends it to the RLC entity of the terminal.

Step 404: The RLC entity of the terminal decodes the RLC PDU, obtains the RLC SDU, acquires the timestamp sent by the data packet, and saves the timestamp.

Step 405: The RLC entity of the terminal acquires a timestamp (second time information) of the current cell.

Step 406: The RLC entity of the terminal acquires transmission delay information of the data packet.

The method for calculating the timestamp of the current cell in step 405 and the method for calculating the transmission delay information in step 406 are the same as those in the first embodiment, and therefore are not described herein.

FIG. 8 is a flowchart of Embodiment 5 of the present invention. In the fifth embodiment, the data packet transmitted in the system 2 is a second access technology network adaptation layer protocol data unit, such as an RLC adaptation layer protocol data unit, a MAC adaptation layer protocol data unit, or a PDCP adaptation protocol data. unit. The second access technology network adaptation layer protocol data unit is an RLC adaptation layer protocol data unit, and the first time information is obtained in the header information of the RLC layer protocol data unit.

As shown in FIG. 8, the steps of the fifth embodiment are described in detail below:

Step 501: The RLC entity of the system 1 encapsulates the RLC SDU of the terminal into the RLC PDU, and sends the RLC adapter to the WLAN offload.

Step 502: The WLAN offloaded RLC Adapter encapsulates the RLC PDU into a WLAN MAC PDU, and adds a timestamp (first time information) of the current system 1 in the header information of the data packet, and sends the WLAN offload to the terminal side through the WLAN air interface. RLC adapter.

The timestamp contains the SFN and the subframe number, or only the SFN.

Step 503: The RLC adapter on the terminal side decodes the corresponding RLC PDU, and sends the RLC PDU to the RLC entity of the terminal, acquires the timestamp of the data packet, and saves the timestamp.

Step 504: The RLC adapter of the terminal acquires a timestamp of the current cell.

Step 505: The RLC adapter of the terminal acquires transmission delay information of the data packet.

The method for calculating the timestamp of the current cell in step 504 and the method for calculating the transmission delay information in step 505 are the same as those in the first embodiment, and therefore are not described herein.

In addition, an optional embodiment of the present invention further provides an apparatus for acquiring a transmission delay between access technologies, which is installed in a terminal, as shown in FIG. 9, and includes an obtaining module and a calculating module.

The obtaining module 901 is configured to: receive a data packet transmitted from the first access technology network via the second access technology network, and obtain the first when the data packet is added to the first access technology network from the received data packet. Time information

The calculating module 902 is configured to: calculate transmission delay information of the data packet according to the obtained first time information and the second time information of the first access technology network when the terminal receives the data packet.

In an optional embodiment, the calculating module 902 is specifically configured to: determine a transmission delay of the data packet according to a difference between the second time information of the first access technology network and the obtained first time information when the terminal receives the data packet. information.

Specifically, the calculation module 902 is specifically configured to: when the first time information and the second time information both include the SFN and the subframe number of the first access technology network, according to [(1024+SFN2-SFN1) MOD 1024] *10+[(subframe2–subframe1)MOD 10], calculating the transmission delay information of the data packet, where SFN1 represents the SFN included in the first time information, SFN2 represents the SFN included in the second time information, and subframe1 represents the first time information. The included subframe number, subframe2 indicates the subframe number included in the second time information.

The calculating module 902 is specifically configured to: when the first time information and the second time information both include the SFN of the first access technology network, calculate the transmission of the data packet according to [(1024+SFN2-SFN1)MOD 1024]*10 Delay information, where SFN1 represents the SFN included in the first time information, and SFN2 represents the SFN included in the second time information.

In addition, the specific processing procedure of the device is the same as that described above, and thus will not be described herein.

The embodiment of the invention further discloses a computer program, comprising program instructions, which, when executed by the terminal, enable the terminal to perform any of the above methods for acquiring transmission delay between access technologies.

The embodiment of the invention also discloses a carrier carrying the computer program.

Other aspects will be apparent upon reading and understanding the drawings and detailed description.

The basic principles and main features of the present invention and the advantages of the present invention are shown and described above. The present invention is not limited by the above-described embodiments, and the above-described embodiments and the description are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention. And modifications are intended to fall within the scope of the invention as claimed.

Industrial applicability

The technical solution of the invention can know the transmission delay between the access technology networks, and provides technical guarantee for preventing the transmission delay problem and the queuing phenomenon of the data unit. Therefore, the present invention has strong industrial applicability.

Claims

A method for obtaining transmission delay between access technology networks, comprising:

Receiving, by the terminal, a data packet from the first access technology network that is transmitted through the second access technology network, and acquiring, from the received data packet, the first time information when the data packet is added to the first access technology network. ;

The terminal calculates the transmission delay information of the data packet according to the obtained first time information and the second time information of the first access technology network when the terminal receives the data packet.
The method for obtaining a transmission delay between access network networks according to claim 1, wherein the data packet comprises:

The radio link controls the RLC layer protocol data unit; or,

Media access control MAC layer protocol data unit; or,

Packet data convergence protocol PDCP layer protocol data unit; or,

a second access technology network adaptation layer protocol data unit, where the second access technology network adaptation layer is located above the MAC layer or the physical PHY layer of the second access technology network, and is located at the first A user plane entity below the PDCP layer, the RLC layer, or the MAC layer of the access technology network.
The method for obtaining a transmission delay between access network networks according to claim 1, wherein the first time information comprises:

a system frame number SFN of the first access technology network and a subframe number of the first access technology network; or

The SFN of the first access technology network.
The method for obtaining a transmission delay between access network networks according to claim 1 or 3, wherein the second time information includes an SFN of the first access technology network and a subframe number of the first access technology network, Or the SFN of the first access technology network.
The method for obtaining a transmission delay between access network networks according to claim 1, wherein the first time information comprises:

Time information in the first access technology network when the data packet is generated; or

The first access technology when the data packet is first transmitted to the second access technology network Time information in the network; or,

Time information in the first access technology network when the data packet arrives at the first access technology network.
The method for obtaining a transmission delay between access network networks according to claim 1, wherein the second time information comprises:

Time information in the first access technology network when the physical layer of the terminal receives the data packet; or

Time information in the first access technology network when the corresponding user plane of the terminal receives the data packet; or

Time information in the first access technology network when the corresponding user plane entity of the terminal processes the data packet; or

The time information in the first access technology network when the corresponding user plane entity of the terminal submits the data packet to a higher layer.
The method for obtaining a transmission delay between access network networks according to claim 1, wherein the terminal acquires the first time information when the data packet is added to the first access technology network from the received data packet. The steps include:

The terminal decodes the received data packet, and acquires the first time information from the header information of the data packet.
The method for obtaining a transmission delay between access network networks according to claim 1, wherein the first access technology is obtained by the terminal according to the obtained first time information and when the terminal receives the data packet The second time information of the network, the step of calculating the transmission delay information of the data packet includes:

And determining, by the terminal, the transmission delay information of the data packet according to the difference between the second time information of the first access technology network and the obtained first time information when the terminal receives the data packet.
The method for obtaining a transmission delay between access network networks according to claim 8, wherein when the first time information and the second time information both include an SFN and a subframe number of the first access technology network, The step of calculating the transmission delay information of the data packet according to the obtained first time information and the second time information of the first access technology network when the terminal receives the data packet includes:

According to the formula: [(1024+SFN2-SFN1)MOD 1024]*10+[(subframe2– Subframe1) mod 10], calculating transmission delay information of the data packet,

The SFN1 represents an SFN included in the first time information, the SFN2 represents an SFN included in the second time information, the subframe1 represents a subframe number included in the first time information, and the subframe2 represents The subframe number included in the second time information.
The method for obtaining a transmission delay between access network networks according to claim 8, wherein when the first time information and the second time information both comprise an SFN of the first access technology network, The step of calculating the transmission delay information of the data packet according to the obtained first time information and the second time information of the first access technology network when the terminal receives the data packet includes:

Calculating the transmission delay information of the data packet according to the formula [(1024+SFN2-SFN1) MOD 1024]*10,

The SFN1 represents an SFN included in the first time information, and the SFN2 represents an SFN included in the second time information.
A device for obtaining a transmission delay between access technologies, is disposed in a terminal, and includes an obtaining module and a computing module, where:

The acquiring module is configured to: receive a data packet from the first access technology network transmitted via the second access technology network, and obtain the data packet from the received data packet to join the first access First time information when the technology network is available;

The calculating module is configured to: calculate the data according to the first time information obtained by the acquiring module and the second time information of the first access technology network when the terminal receives the data packet Packet transmission delay information.
The apparatus for acquiring a transmission delay between access technologies according to claim 11, wherein the calculating module is configured to: according to the obtained first time information and the terminal receiving the data packet, according to the following manner The second time information of the first access technology network calculates the transmission delay information of the data packet:

And determining a transmission delay information of the data packet according to a difference between the second time information of the first access technology network and the obtained first time information when the terminal receives the data packet.
The apparatus for acquiring a transmission delay between access network networks according to claim 12, wherein When the first time information and the second time information both include the SFN and the subframe number of the first access technology network, the calculating module is configured to receive the first time information and the terminal receiving station according to the obtained manner The second time information of the first access technology network in the data packet calculates the transmission delay information of the data packet:

Calculating the transmission delay information of the data packet according to the formula [(1024+SFN2-SFN1)MOD 1024]*10+[(subframe2–subframe1)MOD 10],

The SFN1 represents an SFN included in the first time information, the SFN2 represents an SFN included in the second time information, the subframe1 represents a subframe number included in the first time information, and the subframe2 represents The subframe number included in the second time information.
The apparatus for obtaining a transmission delay between access network networks according to claim 12, wherein when the first time information and the second time information both comprise an SFN of the first access technology network, the calculating module is configured to follow Determining the transmission delay information of the data packet according to a difference between the second time information of the first access technology network and the obtained first time information when the terminal receives the data packet:

Calculating transmission delay information of the data packet according to the formula [(1024+SFN2-SFN1)MOD 1024]*10, wherein the SFN1 represents an SFN included in the first time information, and the SFN2 represents the first The second time information contains the SFN.