WO2013075493A1

WO2013075493A1 - Method and device for acquiring delay of data packet in second layer

Info

Publication number: WO2013075493A1
Application number: PCT/CN2012/077866
Authority: WO
Inventors: 任广进; 赵敬超
Original assignee: 中兴通讯股份有限公司
Priority date: 2011-11-23
Filing date: 2012-06-29
Publication date: 2013-05-30
Also published as: CN103138873B; CN103138873A

Abstract

Disclosed are a method and a device for acquiring the delay of data packet in the second layer. The method comprises: the MAC layer acquiring and storing the receiving time of a data packet received by the PDCP layer, and sending the data packet to a correspondent terminal; after a response from the correspondent terminal is received, the MAC layer determines that the reception of the response to the data packet is complete, and acquires the response time for the data packet; and the MAC layer obtains the delay of the data packet in the second layer by subtracting the receiving time from the response time. By using the present invention, the MAC acquires and stores the receiving time of the data packet received by the PDCP layer, acquires the response time for the data packet after it determines the reception of the response for the data packet is complete, and then subtracts the receiving time from the response time to obtain the delay of the data packet in the second layer, thereby solving the problems of low accuracy and poor versatility of the method for calculating the delay of data packet in the second layer in the art.

Description

TECHNICAL FIELD The present invention relates to the field of communications, and in particular to a method and a device for acquiring a layer 2 data packet delay. 1 is a flowchart of user plane downlink data of Long Term Evolution (LTE) according to the related art. As shown in FIG. 1 , an evolved terrestrial radio access network node (E-URTAN NodeB, referred to as e) B) The user equipment (User Equipment, UE for short) protocol stack, from the upper layer to the lower layer, includes: GPRS Tunneling Protocol User Plane (GTPU) layer, Packet Data Convergence (Packet Data Convergence) Protocol, referred to as PDCP layer, Radio Link Control (RLC) layer, Medium Access Control (MAC) layer; downlink data or message (Message) arrives at the eNB, after The GTPU layer, the PDCP layer, the RLC layer, and the MAC layer process, and finally reach the physical channel (Physical Channel, referred to as PHY) layer of the transmitting end. According to the agreement, the layer 2 packet delay refers to the start of receiving a data or data packet from the PDCP layer of the eNB until the data or the last fragment of the data packet receives the hybrid automatic repeat request from the peer end (Hybrid Automatic) Repeat Request (abbreviated as HARQ) The time taken for the response. The response may be the acknowledgement character (Acknowledgment, ACK for short) returned by the peer after receiving the last fragment of the data or data packet, or it may be the data or After the last fragment of the packet is transmitted to the peer, the Hybrid Automatic Repeat Request (HARQ) is sent by the peer. However, according to the existing processing mechanism, the calculation accuracy of the layer 2 packet delay cannot be guaranteed. The existing processing mechanism determines that a PDCP data packet is completely received by the UE, and the RLC layer receives the response corresponding to the PDCP data packet. This calculation method increases the peer to return to the local MAC layer than the method specified by the protocol. After the response, the MAC layer sends the response time to the RLC layer, so the obtained delay value is larger than the real layer 2 packet delay value. In addition, there are three transmission modes of the RLC layer: acknowledge mode (also known as AM mode), unacknowledged mode (also known as UM mode), and transparent mode (also known as TM mode). For the UM mode, the sender is not required to inform the sender of the correct reception of the data, that is, the status report is not fed back after the data is transmitted. Therefore, the method for calculating the layer 2 packet delay is not applicable to the data transmission in the UM mode. Aiming at the low accuracy and poor versatility of the calculation method of the layer 2 packet delay in the related art, an effective solution has not been proposed yet. SUMMARY OF THE INVENTION The embodiments of the present invention provide a method and a device for acquiring a layer 2 data packet delay, so as to at least solve the problem of low accuracy and poor versatility of the calculation method of the layer two data packet delay in the related art. According to an aspect of the present invention, a method for obtaining a layer 2 data packet delay is provided, where the method includes: acquiring, by a MAC layer, a storage time of a data packet received by a PDCP layer; and sending a data packet to the opposite end; The MAC layer receives the response of the peer end to the data packet; the MAC layer determines the response time of the data packet after receiving the response of the data packet; the MAC layer sets the response time minus the receiving time, and obtains the layer 2 data packet of the data packet. Delay. Preferably, the receiving, by the MAC layer, the receiving time of the data packet received by the PDCP layer includes: after receiving the data packet whose PDCP layer serial number is SN, the PDCP layer sends the data packet receiving time and the data packet to the RLC layer; The RLC layer determines the sending manner of the foregoing data packet according to the current bandwidth, where the sending mode includes a splitting mode or a combination mode; the RLC layer sends the data packet and the receiving time to the MAC layer according to the determined sending manner; the MAC layer receives the After the data packet and the receiving time, the SN and the receiving time are buffered in the corresponding buffer. Preferably, the RLC layer sends the data packet and the receiving time to the MAC layer according to the determined sending manner, and when the determined sending mode is the split mode, the RLC layer splits the data packet into multiple RLC data packets; The RLC layer sends the foregoing multiple RLC data packets to the MAC layer, and sends the foregoing SN and the receiving time to the MAC layer;

The MAC layer sends the data packet to the opposite end, the MAC layer receives the multiple RLC data packets, and encapsulates multiple RLC data packets into multiple transport blocks TB; the MAC layer sends multiple TBs to the opposite end;

After the MAC layer determines that the response of the data packet is received, the response time of obtaining the data packet includes: after receiving all the responses of the multiple TBs, the MAC layer determines that the response of the data packet is received; the MAC layer will be the last one of the multiple TBs. The response reception time of the TB is taken as the response time of the data packet. Preferably, the buffer for buffering the SN and the receiving time is a buffer for transmitting the plurality of TBs. Preferably, the RLC layer sends the foregoing data packet and the foregoing receiving time to the MAC layer according to the determined sending manner, and when the determined sending manner is the combined mode, the RLC layer receives multiple data packets from the PDCP layer, and multiple data is received. The packets are spliced into one RLC data packet; the RLC layer sends the RLC data packet to the MAC layer, and sends the PDCP layer sequence number and the receiving time of each data packet of the multiple data packets to the MAC layer; The MAC layer sends the foregoing data packet to the opposite end, where: the MAC layer receives the foregoing RLC data packet, and encapsulates the RLC data packet into one TB; the MAC layer sends the TB to the opposite end;

After the MAC layer determines that the response of the data packet is received, obtaining the response time of the data packet includes: after receiving the response of the TB, the MAC layer determines, according to the correspondence between the TB and the PDCP layer serial number, that the response of the data packet is received; The MAC layer uses the reception time of the response as the response time of the data packet. Preferably, the buffer for buffering the SN and the receiving time is a buffer corresponding to the TB. According to another aspect of the present invention, a device for acquiring a layer two data packet delay is provided, where the MAC layer of the device includes: a receiving time acquisition and storage module, configured to acquire and store a data packet received by the PDCP layer. Receiving time; the data packet sending module is configured to send a data packet to the opposite end; the answering receiving module is configured to receive the response of the peer end to the data packet; and the response time obtaining module is configured to: after determining that the response of the data packet is received, obtain The response time of the data packet; the delay acquisition module is configured to set the response time obtained by the response time acquisition module minus the reception time to obtain the reception time stored by the storage module, and obtain the layer 2 data packet delay of the data packet. Preferably, the PDCP layer of the device includes: a first sending module, configured to: after receiving the data packet with the PDCP layer serial number SN, send the data packet receiving time and the data packet to the RLC layer; the RLC layer includes a sending mode determining module, configured to determine, according to a current bandwidth, a sending manner of the foregoing data packet, where the sending manner includes a splitting manner or a combination manner; and a second sending module, configured to send the foregoing data packet according to the determined sending manner The receiving time is sent to the MAC layer. The receiving time acquiring and storing module includes: a buffer unit configured to: after receiving the data packet and the receiving time, buffering the SN and the receiving time in a corresponding buffer. Preferably, the second sending module includes: a splitting unit, configured to split the data packet into multiple RLC data packets when the determined sending mode is a split mode; the first sending unit is configured to set multiple RLCs The data packet is sent to the MAC layer, and the foregoing SN and the foregoing receiving time are sent to the MAC layer. The data packet sending module includes: a first receiving unit, configured to receive the multiple RLC data packets; and a first encapsulating unit, configured to be The plurality of RLC data packets received by the receiving unit are encapsulated into a plurality of transport blocks TB; the first TB sending unit is configured to send the plurality of TBs of the first encapsulating unit package to the opposite end; the response time obtaining module includes: the first response a determining unit, configured to: after receiving all the responses of the plurality of TBs, determine that the response of the data packet is received; the first response time determining unit is configured to use the response receiving time of the last one of the plurality of TBs as the data packet Response time. Preferably, the second sending module includes: a combining unit, configured to: when the determined sending mode is the combined mode, receive multiple data packets from the PDCP layer, and splicing the multiple data packets into one RLC data packet; a unit, sending the RLC data packet to the MAC layer, and transmitting a PDCP layer sequence number and a receiving time of each data packet of the multiple data packets to the MAC layer; the data packet sending module includes: a second receiving unit, configured to receive The second encapsulation unit is configured to encapsulate the RLC data packet received by the second receiving unit into one TB; the second TB sending unit is configured to send the TB of the second encapsulation unit package to the opposite end; The module includes: a second response determining unit configured to: after receiving the response of the TB, determine, according to the correspondence between the TB and the PDCP layer serial number, that the response of the data packet is received; the second response time determining unit is configured to The reception time of the response is taken as the response time of the above data packet. According to the embodiment of the present invention, the MAC layer acquires and stores the receiving time of the data packet received by the PDCP layer, and then sends the data packet to the opposite end, and the MAC layer receives the response of the data packet to the peer end, and obtains the data packet after receiving the response. The response time of the data packet, and then the response time minus the receiving time, obtains the layer 2 data packet delay of the data packet, and solves the problem of low accuracy and poor versatility of the calculation method of the layer 2 data packet delay in the related art. Improved user experience. BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are set to illustrate,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, In the drawings: FIG. 1 is a flowchart of long-term evolution user plane downlink data according to the related art; FIG. 2 is a flowchart of a method for acquiring layer two data packet delay according to an embodiment of the present invention; FIG. 4 is a block diagram showing a structure of an apparatus for acquiring a layer 2 packet delay according to a preferred embodiment of the present invention; FIG. 4 is a block diagram showing a specific structure of an apparatus for acquiring a layer 2 packet delay according to a preferred embodiment of the present invention; FIG. 6 is a block diagram of a third specific structure of an apparatus for acquiring a layer 2 packet delay according to a preferred embodiment of the present invention; FIG. 7 is a flowchart of a method for acquiring a layer 2 packet delay in a split mode according to an embodiment of the present invention; FIG. 8 is an acquisition layer 2 packet delay in a combined manner according to an embodiment of the present invention; Flow chart of the method. BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict. In order to improve the accuracy and versatility of the delay calculation of the layer 2 data packet (which may also be written as a "layer 2 data packet" or a "layer 2 packet"), the embodiment of the present invention provides a layer 2 data packet delay acquisition. Method and equipment. The details will be described below by way of examples. This embodiment provides a method for obtaining a layer 2 data packet delay, and a flowchart for acquiring a layer 2 data packet delay according to an embodiment of the present invention, which may be in a network device (for example, The method includes the following steps (step S202 - step S210): Step S202, the MAC layer acquires and stores the receiving time of the data packet received by the PDCP layer; Step S204, the MAC layer sends the foregoing to the opposite end. Step S206, the MAC layer receives the response of the peer to the data packet; Step S208, the MAC layer determines that the response of the data packet is received, and obtains the response time of the data packet; Step S210, the MAC layer sets the response time minus To receive the time, the layer 2 packet delay of the above data packet is obtained. The foregoing response is a response that the peer MAC layer returns to the local MAC layer after receiving the data packet sent by the local MAC layer, and the UM mode is a transmission mode of the RLC layer, so the method is in the MAC. There is no non-response in the layer, so the implementation of the MAC layer improves the versatility of this calculation method. The MAC layer obtains the response time after receiving the response of the data packet, which omits the time when the MAC layer sends a response to the RLC layer, so that the method for calculating the layer 2 packet delay is more accurate. In this embodiment, the MAC layer acquires and stores the reception time of the data packet received by the PDCP layer, and the response time of the MAC layer to obtain the data packet after determining that the response of the data packet is received, and then sets the response time minus the reception. Time gets the layer 2 packet delay of the data packet, because the MAC layer will receive the response of each data packet, and the MAC layer calculates the layer 2 data packet delay to save the time that the MAC layer sends the response to the RLC layer. Therefore, the problem of low accuracy and poor versatility of the calculation method of the layer 2 packet delay in the related technology is solved, and the user experience is improved. In the foregoing embodiment, before the data packet is sent to the MAC layer, the data packet passes through the PDCP layer, the RLC layer, and then the MAC layer from the upper layer to the lower layer. Specifically, after the PDCP layer receives the data packet with the PDCP layer serial number SN, The receiving time of the data packet is recorded, and the receiving time and the data packet are sent to the RLC layer, and the RLC layer determines the sending manner of the data packet according to the current bandwidth, where the sending manner includes splitting or combining, and then, the RLC layer The data packet and the receiving time are sent to the MAC layer according to the determined sending manner. After receiving the data packet and the receiving time, the MAC layer caches the PDCP layer serial number SN and the receiving time of the data packet in the corresponding buffer. In the above process, the PDCP layer records the receiving time of the data packet and stores it in the corresponding buffer, so that when the layer 2 data packet delay is calculated, the receiving time is conveniently obtained. The SN in the embodiment of the present invention may be set on the packet header of the data packet. In the case that the current bandwidth is small, the RLC layer selects the split mode to transmit the data packet, the RLC layer receives the data packet from the PDCP layer, and splits the data packet into multiple RLC data packets, and then multiple RLCs. The data packet is sent to the MAC layer, and the SN and the receiving time are also sent to the MAC layer. The MAC layer caches the SN and the receiving time in the corresponding buffer, and encapsulates multiple RLC data packets into multiple transport blocks (Transport Block, referred to as TB), then the MAC layer sends the multiple TBs to the peer. After receiving the multiple TBs, the peer end returns a response to the MAC layer. After the MAC layer determines that the response of the data packet is received, the response reception time of the last TB of the plurality of TBs is used as the response time of the data packet. In this way, when all the TBs are received by the opposite end, the response time is recorded, and the accuracy of the calculation layer 2 packet delay is ensured. The above buffer may be a buffer for transmitting a plurality of TBs, that is, a PDCP layer sequence number SN and a reception time of the data packet are stored in buffers corresponding to the respective TBs. The RLC layer determines the manner in which the data packet is transmitted according to the current bandwidth. In the case where the current bandwidth is large, the RLC layer selects a combined manner to transmit the data packet. Based on this, the RLC layer receives multiple data packets from the PDCP layer. And splicing a plurality of data packets into one RLC data packet, and transmitting the RLC data packet to the MAC layer, and also transmitting the PDCP layer serial number SN and the receiving time of each of the plurality of data packets to the MAC layer. The MAC layer caches the SN and the receiving time in the corresponding buffer, encapsulates the RLC data packet into one TB, and then the MAC layer sends the TB to the opposite end. After receiving the TB, the peer end returns a response to the MAC layer. After the MAC layer determines that the response of the data packet has been received, the response reception time of the TB is used as the response time of the data packet. This can ensure the accuracy of the calculation layer 2 packet delay. The above buffer may be a buffer corresponding to the sending TB, and the MAC layer caches the SN and the receiving time in the buffer area for the purpose of conveniently reading the receiving time when the MAC computing layer 2 data packet is delayed. The above MAC layer refers to the MAC layer of the local end. Corresponding to the foregoing method, the embodiment further provides a layer 2 data packet delay acquiring device, which is used to implement the foregoing embodiment, and FIG. 3 is a layer 2 data packet delay acquiring device according to an embodiment of the present invention. As shown in FIG. 3, the MAC layer in the device includes: a receiving time acquisition and storage module 30, a data packet transmitting module 32, a response receiving module 34, a response time obtaining module 36, and a delay obtaining module 38. The structure will be described below. The receiving time acquisition and storage module 30 is configured to acquire and store the receiving time of the data packet received by the PDCP layer; the data packet sending module 32 is connected to the receiving time acquisition and storage module 30, and configured to send the data packet to the opposite end; The receiving module 34 is connected to the data packet sending module 32, and is configured to receive the response of the peer to the data packet. The response time obtaining module 36 is connected to the response receiving module 34, and is configured to obtain the data after receiving the response of the data packet. The response time of the packet; the delay acquisition module 38 is connected to the reception time acquisition and storage module 30 and the response time acquisition module 36, and is configured to set the response time acquired by the response time acquisition module 36 minus the reception time acquisition and storage module 30. Receive time, get the layer 2 packet delay of the packet. After the receiving time acquisition and storage module 30 acquires and stores the receiving time of the data packet received by the PDCP layer, the data packet transmitting module 32 sends a data packet to the opposite end, and then the response receiving module 34 receives the opposite end of the data packet. The response, the response time acquisition module 36 obtains the response time of the data packet after determining that the response of the data packet is received, and the delay acquisition module 38 sets the response time minus the reception time to obtain the layer 2 data packet delay of the data packet. The MAC layer receives the response of each data packet, and the MAC layer calculates the layer 2 data packet delay to save the time that the MAC layer sends the response to the RLC layer, and solves the calculation method of the layer 2 data packet delay in the related art. The low accuracy and poor versatility raises the user experience. In the above embodiment, before the data packet is sent to the MAC layer, the data packet passes through the PDCP layer, the RLC layer, and the MAC layer from the upper layer to the lower layer in sequence. FIG. 4 is a layer 2 packet delay acquisition according to a preferred embodiment of the present invention. A specific structural block diagram of the device, as shown in FIG. 4, the device includes: a first sending module 40 of the PDCP layer, a sending mode determining module 42 of the RLC layer, and the module of the MAC layer in FIG. The second sending module 44 and the receiving time of the MAC layer acquire the buffer unit 302 in the storage module 30. The structure will be described below. The first sending module 40, located in the PDCP layer of the device, is configured to receive the data packet of the PDCP layer sequence number SN, and then send the data packet to the RLC layer; the sending mode determining module 42 The RLC layer in the device is connected to the first sending module 40, and is configured to determine a sending manner of the data packet according to the current bandwidth, where the sending manner includes a splitting manner or a combination manner; and the second sending module 44 is located at The RLC layer in the device is connected to the sending mode determining module 42 and configured to send the data packet and the receiving time to the MAC layer according to the determined sending manner. The buffering unit 302 is located in the receiving time acquisition and storage module 30 of the MAC layer. And connecting to the second sending module 44, configured to receive the foregoing data packet and the receiving time, and buffer the SN and the receiving time in the corresponding buffer.

The RLC layer determines the manner in which the data packet is transmitted according to the current bandwidth. In the case where the current bandwidth is small, the RLC layer selects the split mode to transmit the data packet, and FIG. 5 is a layer 2 data packet according to a preferred embodiment of the present invention. Another specific structural block diagram of the delay acquiring device, as shown in FIG. 5, includes: in addition to the respective modules in FIG. 4, the splitting unit 442 and the first sending unit 444 in the second sending module 44. The first receiving unit 322, the first encapsulating unit 324, and the first TB transmitting unit 326 in the packet sending module 32, the first response determining unit 362 and the first response time determining unit 364 in the response time acquiring module 36. The structure will be described below. The splitting unit 442 is located in the second sending module 44, and is configured to split the data packet into multiple RLC data packets when the determined sending mode is the split mode. The first sending unit 444 is located in the second sending module 44. And connecting to the splitting unit 442, configured to send the multiple RLC data packets to the MAC layer, and send the SN and the receiving time to the MAC layer; the first receiving unit 322, located in the data packet sending module 32, connected to the a sending unit 444, configured to receive multiple RLC data packets; The first encapsulating unit 324 is located in the data packet sending module 32 and is connected to the first receiving unit 322, and is configured to encapsulate the plurality of RLC data packets received by the first receiving unit 322 into a plurality of transport blocks TB. The first TB sending unit 326 The packet sending module 32 is connected to the first encapsulating unit 324 and configured to send the plurality of TBs encapsulated by the first encapsulating unit 324 to the opposite end. The first response determining unit 362 is located in the response time acquiring module 36, and is configured to receive After all the responses of the plurality of TBs, it is determined that the response of the data packet is received; the first response time determining unit 364 is located at the response time obtaining module 36, and is connected to the first response determining unit 362, and is set to be the last one of the plurality of TBs. The response reception time of the TB is taken as the response time of the data packet. In the case where the current bandwidth is large, the RLC layer selects a combination manner to transmit a data packet. FIG. 6 is a third structural block diagram of a device for acquiring a layer two packet delay according to a preferred embodiment of the present invention. As shown in FIG. 6, in addition to the modules in FIG. 4, the method further includes: The combining unit 446 and the second sending unit 448 in the sending module 44, the second receiving unit 328, the second encapsulating unit 330 and the second TB sending unit 332 in the data packet sending module 32, and the second in the response time obtaining module 36 The response determination unit 366 and the second response time determination unit 368. The structure will be described below. The combining unit 446 is located at the second sending module 44, and is configured to receive multiple data packets from the PDCP layer and combine the multiple data packets into one RLC data packet when the determined sending mode is the combined mode. The second sending unit 448 The second sending module 44 is connected to the combining unit 446, sends the RLC data packet to the MAC layer, and sends the PDCP layer sequence number and the receiving time of each data packet of the multiple data packets to the MAC layer; The unit 328 is located in the data packet sending module 32, and is connected to the second sending unit 448, and is configured to receive the RLC data packet. The second encapsulating unit 330 is located in the data packet sending module 32 and is connected to the second receiving unit 328. The second TB sending unit 332 is configured to be a TB. The second response determining unit 366 is located in the response time obtaining module 36, and is configured to determine the data according to the correspondence between the TB and the PDCP layer serial number after receiving the response of the TB. The response of the packet is received; The second response time determining unit 368, located in the response time obtaining module 36, is connected to the second response determining unit 366, and is configured to set the receiving time of the response as the response time of the data packet. In the foregoing two embodiments of the device for acquiring the data packet delay of the layer two, the structure of the device in the case where the RLC layer selects different methods of sending packets is respectively introduced, and the RLC layer selects split or combined to send data. The packet is determined based on the current bandwidth, and the application range of the acquisition device of the layer 2 packet delay is expanded, and the versatility of the device is improved. It can be seen from the foregoing embodiment that the MAC layer in the embodiment of the present invention can clearly know the PDCP SN number corresponding to a certain TB, and store the PDCP SN number corresponding to the TB and the receiving time of the PDCP layer receiving the data packet in the MAC layer. For the split mode, when the last TB of a PDCP packet receives a response from the UE (for example, a HARQ response), the MAC layer records the response time at this time, and the MAC layer subtracts the reception time according to the response time, and calculates the PDCP data. Layer 2 packet delay for the packet. In order to make the method of the present invention more understandable, the implementation process of the above embodiment will be described in detail below with reference to the preferred embodiments and the accompanying drawings. Embodiment 1 In this embodiment, the RLC layer selects a split mode to perform data packet transmission when the current bandwidth is small. The PDCP layer receives the downlink data and sends the data to the RLC layer according to the current bandwidth. The RLC layer decides to send the data packet by splitting the data packet or combining the data packets. FIG. 7 is a flowchart of a method for acquiring a layer 2 packet delay in a split mode according to an embodiment of the present invention. As shown in FIG. 7, the method includes the following steps (S702-S712): Step S702, the local end The PDCP layer receives the data packet whose sequence number is SN in the PDCP layer. For example, if SN=x is set, the PDCP layer calculates the current time, and timestamps the data packet to send the data packet to the local RLC layer. Step S704, the local RLC layer receives the data packet of the PDCP layer and splits the data packet into n RLC data packets according to the current bandwidth, for example, SN = 1, 2, ... and sends the PDCP SN number and the timestamp T1 to the present packet. End MAC layer. Step S706: After receiving the data packet of the RLC layer, the local MAC layer encapsulates the RLC data packet into a TB (for example, 0, 1, -n), and then sends the data to the peer MAC layer, and carries the PDCP SN carried by the local RLC layer. The number and the timestamp T1 are stored in a buffer corresponding to each TB of the local MAC layer (for example, a HARQ buffer). Step S708: After receiving the TB sent by the local MAC layer, the peer MAC layer replies to the TBI, TB2, and TBn respectively. The response may be an ACK returned by the peer MAC layer after receiving the TB, or may be an HARQ sent by the peer MAC layer after the TB transmits to the opposite MAC layer. Step S710: After receiving the response, the local MAC layer determines, according to the correspondence between the TB and the PDCP SN stored in the HARQ buffer, that the response to the TBn, that is, the response of the last TB, is determined, and the PDCP data packet is received. The last piece. Step S712, the local MAC layer obtains the response time T2 of the corresponding TBn, and subtracts the PDCP layer timestamp T1 recorded in the corresponding buffer to obtain the layer 2 data packet delay of the PDCP data packet. Embodiment 2 This embodiment is described by taking an example in which the RLC layer selects a combination to perform data packet transmission in a case where the current bandwidth is large. FIG. 8 is an acquisition layer two data in a combined manner according to an embodiment of the present invention. A flowchart of a method for packet delay, as shown in FIG. 8, the method includes the following steps (S802-S812): Step S802, the local PDCP layer receives downlink data, that is, a data packet whose PDCP layer serial number is SN, for example, Set SN= 1, 2, ...! The PDCP layer calculates the current time, and timestrate each data packet by Τ1, Τ2···Τη, and then sends the data packet and the timestamp to the local RLC layer; Step S804, the local RLC layer receives the current After the data packet of the PDCP layer, the n PDCP data packets are spliced into one RLC data packet according to the current bandwidth. And sending all the PDCP SN numbers and the timestamps ,1, Τ2, · Τη included in the RLC data packet to the local MAC layer; Step S806, the local MAC layer receives the data packet sent by the local RLC layer, and then sets the RLC. The data packet is encapsulated into one TB and sent to the peer MAC layer, and all the PDCP SN numbers carried by the RLC layer and the timestamps T1, Τ2, Τη are stored in the buffer corresponding to the TB in the local MAC layer (for example: HARQ buffer) In step S808, the peer MAC layer replies to the TB after receiving the TB sent by the local MAC layer; Step S810, the local MAC layer receives the response according to the TB and PDCP SN recorded in the HARQ buffer. Correspondingly, the TB includes a plurality of PDCP data packets. In step S812, the local MAC layer obtains the response time T0 corresponding to the TB, and sequentially subtracts the PDCP layer time stamp Τ1 stored in the HARQ buffer, Τ2··· Τη, respectively obtain the layer 2 packet delay of all PDCP packets included in the TB. The foregoing two embodiments specifically describe the process of calculating the delay of the layer 2 data packet by using the split/combined data packet transmission mode when the current bandwidth is small/large, and the data packet according to the current bandwidth size. The transmission mode is changed, the versatility of the layer 2 packet delay calculation method is improved, and the problem of low accuracy and poor versatility of the calculation method of the layer 2 packet delay in the related technology is solved, and the user experience is improved. The above are only the preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Obviously, those skilled in the art should understand that the above modules or steps of the present invention can be implemented by a general-purpose computing device, which can be concentrated on a single computing device or distributed over a network composed of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device, such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein. The steps shown or described are performed, or they are separately fabricated into individual integrated circuit modules, or a plurality of modules or steps are fabricated as a single integrated circuit module. Thus, the invention is not limited to any specific combination of hardware and software. The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Claims

Claim

A method for obtaining a layer 2 packet delay includes:

Media access control The MAC layer acquires and stores the receiving time of the data packet received by the PDCP layer by the packet data convergence protocol;

Sending, by the MAC layer, the data packet to a peer end;

Receiving, by the MAC layer, a response of the peer to the data packet;

After the MAC layer determines that the response of the data packet is received, the MAC layer obtains a response time of the data packet;

The MAC layer sets the response time minus the receiving time to obtain a layer 2 packet delay of the data packet.

2. The method according to claim 1, wherein the receiving, by the MAC layer, the receiving time of the data packet received by the PDCP layer comprises:

After receiving the data packet with the serial number of the PDCP layer as the SN, the PDCP layer sends the receiving time of the data packet and the data packet to the radio link control RLC layer;

Determining, by the RLC layer, a sending manner of the data packet according to a current bandwidth, where the sending manner includes a splitting manner or a combination manner;

Sending, by the RLC layer, the data packet and the receiving time to the MAC layer according to a determined sending manner;

After receiving the data packet and the receiving time, the MAC layer caches the SN and the receiving time in a corresponding buffer.

3. The method according to claim 2, wherein

Sending, by the RLC layer, the data packet and the receiving time to the MAC layer according to the determined sending manner, when the determined sending mode is the split mode, the RLC layer splits the data packet Dividing into a plurality of RLC data packets; the RLC layer sends the multiple RLC data packets to the MAC layer, and sends the SN and the receiving time to the MAC layer;

The sending, by the MAC layer, the data packet to the peer end includes: the MAC layer receiving the multiple RLC data packets, and encapsulating the multiple RLC data packets into multiple transport blocks TB; Sending the plurality of TBs; After the MAC layer determines that the response of the data packet is received, obtaining the response time of the data packet includes: after receiving all the responses of the multiple TBs, the MAC layer determines that the response of the data packet is received. The MAC layer uses the response reception time of the last TB of the plurality of TBs as the response time of the data packet.

4. The method according to claim 3, wherein buffering the SN and the receiving time is to send each buffer corresponding to the plurality of TBs.

5. The method according to claim 2, wherein

Sending, by the RLC layer, the data packet and the receiving time to the MAC layer according to the determined sending manner, when the determined sending manner is the combined mode, the RLC layer receives the PDCP layer from the PDCP layer. a plurality of data packets, the plurality of data packets being spliced into one RLC data packet; the RLC layer transmitting the RLC data packet to the MAC layer, and each of the plurality of data packets The PDCP layer sequence number and the receiving time are sent to the MAC layer;

The sending, by the MAC layer, the data packet to the peer end includes: the MAC layer receiving the RLC data packet, and encapsulating the RLC data packet into one TB; the MAC layer sending the TB to the opposite end; After the MAC layer determines that the response of the data packet is received, obtaining the response time of the data packet includes: after the MAC layer receives the response of the TB, according to the correspondence between the TB and the PDCP layer serial number Determining that the response of the data packet is received; the MAC layer uses the receiving time of the response as the response time of the data packet.

The method according to claim 5, wherein buffering the SN and the receiving time is a buffer corresponding to sending the TB.

A device for acquiring a layer 2 data packet delay, the medium access control MAC layer of the device includes: a receiving time acquisition and storage module, configured to acquire and store a data packet received by a PDCP layer of a packet data convergence protocol Time

a data packet sending module, configured to send the data packet to a peer end;

The response receiving module is configured to receive the response of the peer to the data packet;

The response time obtaining module is configured to: after determining that the response of the data packet is received, obtain a response time of the data packet; The delay acquisition module is configured to set a response time obtained by the response time acquisition module, subtract the reception time and a reception time stored by the storage module, to obtain a layer 2 data packet delay of the data packet.

8. The apparatus according to claim 7, wherein

The PDCP layer of the device includes: a first sending module, configured to: after receiving a data packet with a PDCP layer sequence number SN, send the data packet receiving time and the data packet to a radio link control RLC layer;

The RLC layer includes: a sending mode determining module, configured to determine, according to a current bandwidth, a sending manner of the data packet, where the sending mode includes a split mode or a combination mode; and the second sending module is configured to send according to the determined manner Transmitting the data packet and the receiving time to the MAC layer;

The receiving time acquisition and storage module includes: a buffer unit configured to buffer the SN and the receiving time in a corresponding buffer after receiving the data packet and the receiving time.

The device according to claim 8, wherein the second sending module comprises: a splitting unit, configured to split the data packet into multiple when the determined sending mode is the split mode An RLC data packet; a first sending unit, configured to send the multiple RLC data packets to the MAC layer, and send the SN and the receiving time to the MAC layer;

The data packet sending module includes: a first receiving unit configured to receive the plurality of RLC data packets; and a first encapsulating unit configured to encapsulate the plurality of RLC data packets received by the first receiving unit into multiple a transport block TB; a first TB transmitting unit, configured to send the plurality of TBs of the first encapsulation unit package to a peer end;

The response time obtaining module includes: a first response determining unit configured to: after receiving all the responses of the plurality of TBs, determine that the response of the data packet is received; the first response time determining unit is configured to: The response reception time of the last TB of the plurality of TBs is taken as the response time of the data packet.

The device according to claim 8, wherein the second sending module comprises: a combining unit, configured to receive a plurality of data packets from the PDCP layer when the determined sending mode is the combined mode, Splicing the plurality of data packets into one a second sending unit, sending the RLC data packet to the MAC layer, and transmitting a PDCP layer sequence number and a receiving time of each of the plurality of data packets to the MAC layer; The data packet sending module includes: a second receiving unit, configured to receive the RLC data packet; a second encapsulating unit, configured to encapsulate the RLC data packet received by the second receiving unit into one TB; a TB sending unit, configured to send the TB of the second encapsulating unit package to the opposite end; the response time obtaining module includes: a second response determining unit, configured to receive the response of the TB, according to the Corresponding relationship between the TB and the PDCP layer sequence number determines that the response of the data packet is received; and the second response time determining unit is configured to use the reception time of the response as the response time of the data packet.