Patent Publication Number: US-2021176154-A1

Title: Communication method and communication device

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is a continuation of U.S. patent application Ser. No. 16/082,923 filed on Sep. 6, 2018, which is a national phase of International Patent Application No. PCT/CN2016/081716, filed on May 11, 2016, the contents of which are hereby incorporated by reference in their entirety. 
    
    
     TECHNICAL FIELD 
     The disclosure relates to the field of communications, and more particularly to a communication method and a communication device. 
     BACKGROUND 
     In a communication technology, latency has great impact on a user experience, and latency reduction is an urgent need of a modern communication technology. However, for latency reduction, latency is required to be accurately acquired at first. 
     Therefore, an urgent problem to be solved is to accurately acquire latency. 
     SUMMARY 
     Embodiments of the disclosure provide a communication device, which may accurately acquire latency between devices. 
     A first aspect provides a communication device. The communication device includes: a processor, configured to add time indication information into a sending packet, the time indication information is configured for a receiver to acquire a latency from the communication device to the receiver; and a transceiver, configured to transmit the sending packet to the receiver. 
     A second aspect provides a communication device. The communication device includes: a transceiver, configured to receive a sending packet sent by a transmitter, wherein the sending packet comprises time indication information; and a processor, configured to determine a latency from the transmitter to the communication device according to the time indication information. 
     A third aspect provides a communication device. The communication device, includes: a transceiver, configured to receive a sending packet from a transmitter, wherein the sending packet is sent to a receiver; and a processor, configured to add a processing latency of processing the sending packet and a transmission latency between a previous node and the communication device into the sending packet; the transceiver is further configured to send the sending packet to the receiver. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
       In order to describe the technical solutions of the embodiments of the disclosure more clearly, the drawings required to be used in descriptions about the embodiments or a conventional art will be simply introduced below. It is apparent that the drawings described below are only some embodiments of the disclosure. Other drawings may further be obtained by those of ordinary skill in the art according to these drawings without creative work. 
         FIG. 1  is a schematic flowchart of a communication method according to an embodiment of the disclosure. 
         FIG. 2  is a schematic block diagram of a communication device according to an embodiment of the disclosure. 
         FIG. 3  is a schematic block diagram of a communication device according to an embodiment of the disclosure. 
         FIG. 4  is a schematic block diagram of a communication device according to an embodiment of the disclosure. 
         FIG. 5  is a schematic block diagram of a communication device according to an embodiment of the disclosure. 
     
    
    
     DETAILED DESCRIPTION 
     The technical solutions in the embodiments of the disclosure will be clearly and completely described below in combination with the drawings in the embodiments of the disclosure. It is apparent that the described embodiments are not all embodiments but part of embodiments of the disclosure. All other embodiments obtained by those of ordinary skill in the art on the basis of the embodiments in the disclosure without creative work shall fall within the scope of protection of the disclosure. 
     It should be understood that the technical solutions of the disclosure may be applied to various communication systems, for example, a Global System of Mobile Communication (GSM), a Code Division Multiple Access (CDMA) system, a Wideband Code Division Multiple Access (WCDMA) system, a General Packet Radio Service (GPRS), a Long Term Evolution (LTE) system, an Advanced Long Term Evolution (LTE-A) system, a Universal Mobile Telecommunication System (UMTS) and a system in 5th-Generation (5G). 
     In some embodiments, Device to Device (D2D) communication may refer to Vehicle to Vehicle (V2V) communication or Vehicle to X (V2X) communication. In V2X communication, X may generally refer to any device with a wireless receiving and sending capability, for example, but not limited to, a wireless device moving at a low speed, vehicle-mounted equipment moving at a high speed or a network control node with a wireless transmitting and receiving capability. Of course, the embodiments of the disclosure may not be applied to D2D communication but communication between a terminal and a cellular network. 
     In the embodiments of the disclosure, a terminal device may also be called an access terminal, a user unit, a user station, a mobile radio station, a mobile station, a remote station, a remote terminal, a mobile device, a user terminal, a terminal, wireless communication device, a user agent or a user device. The access terminal may be a cell phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), handheld equipment with a wireless communication function, a computing device, other processing device connected to a wireless modem, vehicle-mounted equipment, wearable equipment and a terminal device in a future 5G network. A network device may be configured to communicate with a mobile device. The network device may be a Base Transceiver Station (BTS) in the GSM or CDMA, may also be a NodeB (NB) in WCDMA, and may further be an Evolutional Node B (eNB or eNodeB) in LTE, or a relay station or an access point, or vehicle-mounted equipment, wearable equipment and a network device in the future 5G network. 
       FIG. 1  is a schematic flowchart of a communication method  100  according to an embodiment of the disclosure. As illustrated in  FIG. 1 , the communication method  100  includes operations at blocks 110 ,  120 ,  130  and  140 . 
     In  110 , a transmitter adds time indication information into a sending packet, wherein the time indication information is configured for a receiver to acquire latency from the transmitter to the receiver. 
     In at least one embodiment, the sending packet is a PDCP packet, an RLC packet or a MAC packet. 
     In at least one embodiment, the sending packet is a data packet or a probing packet dedicated for latency detection. 
     In  120 , the transmitter transmits the sending packet to the receiver. 
     In at least one embodiment, the transmitter determines QoS of a service corresponding to the latency from the transmitter to the receiver to be acquired, and the transmitter transmits the sending packet to the receiver according to the corresponding QoS. 
     In  130 , the receiver receives the sending packet sent by the transmitter, wherein the sending packet includes the time indication information. 
     In the example, the receiver parses the time indication information in the same layer where the transmitter adds the time indication information. For example, when the transmitter adds the time indication information in a MAC layer, the receiver parses the time indication information in the MAC layer. 
     In  140 , the receiver determines the latency from the transmitter to the receiver according to the time indication information. 
     In at least one embodiment of the disclosure, the transmitter may transmit the sending packet through multiple paths, and the receiver receives the sending packet sent by the transmitter through the multiple paths and determines a latency of each of the multiple paths. In the example, path information of the corresponding paths may be included in the sending packet, or, an intermediate node through which the sending packet passes adds the path information of the paths into the packet. 
     In at least one embodiment of the disclosure, the time indication information included in the sending packet sent by the transmitter may include a starting time of processing the sending packet by the transmitter, and the receiver may determine the latency from the transmitter to the receiver according to a difference between an ending time of processing the sending packet and the starting time. In the example, the starting time of processing the sending packet by the transmitter refers to a time when the packet is obtained or a time when the packet is started to be generated, and the ending time of processing the sending packet by the receiver may refer to a time when parsing of the packet is completed. 
     In at least one embodiment, the starting time and the ending time may be absolute time, for example, absolute time corresponding to Coordinated Universal Time (UTC), Beidou and a Global Positioning System (GPS). Then the difference between the ending time and the starting time may directly be determined as the latency from the transmitter to the receiver. 
     The starting time and the ending time may not be absolute time, and for example, may be time defined by a communication system, such as, time represented by a subframe or a time slot. Then it is necessary to determine the latency from the transmitter to the receiver according to a synchronization time offset between the transmitter and the receiver and according to the difference between the ending time and the starting time. 
     In the example, the synchronization time offset of the transmitter and the receiver may be calculated according to a synchronization time offset between any two nodes between the transmitter and the receiver. When a previous node of the intermediate node is asynchronous with the intermediate node, the node may determine a synchronization time offset with the previous node and record the synchronization time offset in the sending packet. 
     For example, a node  1  and a node  2  exist between the transmitter and the receiver. The node  1 , after receiving the sending packet, may acquire a synchronization time offset between the transmitter and the node  1  and record it in the sending packet. The node  2 , after receiving the sending packet, may acquire a synchronization time offset between the node  1  and the node  2  and record it in the sending packet. In the example, the synchronization time offset between the node  1  and the node  2  may be accumulated with a previous synchronization time offset for recording in the sending packet, that is, the synchronization time offset between the node  1  and the node  2  is added to the previous synchronization time offset and the recorded synchronization time offset is changed into the added synchronization time offset. In an alternative example, the synchronization time offset between the node  1  and the node  2  may be independently recorded in an information field. The receiver, after receiving the sending packet, may acquire a synchronization time offset between the node  2  and the receiver and acquire a synchronization time offset between the transmitter and the node  2  according to records in the sending packet, so that the synchronization time offset between the transmitter and the receiver may be acquired. 
     In at least one embodiment, the transmitter may add a processing latency of processing the sending packet into the sending packet, and the intermediate node, after receiving the sending packet, may add a processing latency and a transmission latency with the previous node into the sending packet. The intermediate node may independently record the processing latency and the transmission latency in different information fields in the sending packet; or, the intermediate node may record a sum of the processing latency and transmission latency obtained by the intermediate node in an information field, but does not accumulate with time recorded by another node; or, the intermediate node may accumulate the processing latency with a processing latency obtained by the other node for recording in an information field and record the transmission latency and a transmission latency obtained by the other node in another information field; or, the intermediate node accumulates the sum of the transmission latency and the processing latency with a sum of the processing latency and transmission latency recorded in the sending packet and updates the records. After receiving the sending packet, the transmitter may obtain the latency between the transmitter and the receiver according to an indication of the time indication information in the sending packet. 
     For convenient understanding, some recording manners for the time indication information will be described below with some implementation modes as examples. 
     In an implementation mode, the time indication information includes the processing latency of processing the sending packet by the transmitter, includes a processing latency of processing the sending packet by any intermediate node between the transmitter and the receiver and includes a transmission latency between the intermediate node and the previous node of the intermediate node, the transmission latency being acquired by the any intermediate node. In the example, processing latency of processing the sending packet by different nodes are carried in different information fields of the sending packet, transmission latency acquired by different nodes are carried in different information fields of the sending packet, and the processing latency and transmission latency of the same node are carried in different information fields of the sending packet. Under this condition, the receiver determines a processing latency of processing the sending packet by the receiver and a transmission latency between the receiver and a previous node of the receiver. The latency from the transmitter to the receiver is determined according to a sum of the processing latency of processing the sending packet by the transmitter, the processing latency of processing the sending packet by any intermediate node, the transmission latency between the intermediate node and the previous node of the intermediate node that is acquired by the intermediate node, the processing latency of processing the sending packet by the receiver and the transmission latency between the receiver and the previous node of the receiver. 
     For example, the node  1  and the node  2  exist between the transmitter and the receiver, the processing latency (for example, 1 ms) of processing the sending packet by the transmitter is recorded in an information field. The node  1  receives the sending packet, acquires the transmission latency of 0.5 ms from the receiver to the node  1 , acquires the processing latency of 1 ms of processing the sending packet, and records 0.5 ms and 1 ms in different information fields, respectively. The node  2  receives the sending packet, acquires the transmission latency of 0.6 ms from the node  1  to the node  2 , acquires the processing latency of 1.1 ms of processing the sending packet, and records 0.6 ms and 1.1 ms in different information fields, respectively. The receiver receives the sending packet, acquires the transmission latency of 0.4 ms from the node  2  to the receiver and the processing latency of 1.2 ms of processing the sending packet, acquires 1 ms, 1 ms, 0.5 ms, 0.6 ms and 1.1 ms recorded in the sending packet, and adds 1 ms, 1 ms, 0.5 ms, 0.6 ms, 1.1 ms, 0.4 ms and 1.2 ms to obtain a time value for determining the latency from the transmitter to the receiver. 
     In an implementation mode, the time indication information includes the processing latency of processing the sending packet by the transmitter and includes a sum of the processing latency of processing the sending packet by any intermediate node between the transmitter and the receiver and the transmission latency between the intermediate node and a previous node of the intermediate node, wherein sums of the processing latency of processing the sending packet by different nodes and the acquired transmission latency are carried in different information fields of the sending packet. Under this condition, the receiver determines the processing latency of processing the sending packet by the receiver and the transmission latency between the receiver and the previous node of the receiver; The latency from the transmitter to the receiver is determined according to a sum of the processing latency of processing the sending packet by the transmitter, the sum of the processing latency of processing the sending packet by the intermediate node between the transmitter and the receiver and the acquired transmission latency between the intermediate node and the previous node of the intermediate node, the processing latency of processing the sending packet by the receiver and the transmission latency between the receiver and the previous node of the receiver. 
     For example, the node  1  and the node  2  exist between the transmitter and the receiver. The processing latency (for example, 1 ms) of processing the sending packet by the transmitter is recorded in an information field, and the node  1  receives the sending packet, acquires the transmission latency of 0.5 ms from the receiver to the node  1 , acquires the processing latency of 1 ms of processing the sending packet and records 1.5 ms in the information field. The node  2  receives the sending packet, acquires the transmission latency of 0.6 ms from the node  1  to the node  2 , acquires the processing latency of 1.1 ms of processing the sending packet and records 1.7 ms in an information field that is different from the transmitter. The receiver receives the sending packet, acquires the transmission latency of 0.4 ms from the node  2  to the receiver and the processing latency of 1.2 ms of processing the sending packet, acquires 1 ms, 1.5 ms and 1.7 ms recorded in the sending packet and adds 1 ms, 1.5 ms, 1.7 ms, 0.4 ms and 1.2 ms to obtain a time value for determining the latency from the transmitter to the receiver. 
     In an implementation mode, the time indication information includes a sum of the processing latency of processing the sending packet by the transmitter, the processing latency of processing the sending packet by an intermediate node between the transmitter and the receiver and the transmission latency between the intermediate node and a previous node of the intermediate node. The receiver determines the processing latency of processing the sending packet by the receiver and the transmission latency between the previous node of the receiver and the receiver. The latency from the transmitter to the receiver is determined according to a sum of the processing latency of processing the sending packet by the receiver, the transmission latency between the previous node of the receiver and the receiver and the sum of the processing latency of processing the sending packet by the transmitter, the processing latency of processing the sending packet by the intermediate node between the transmitter and the receiver and the transmission latency between the intermediate node and the previous node of the intermediate node. 
     For example, the node  1  and the node  2  exist between the transmitter and the receiver. The processing latency (for example, 1 ms) of processing the sending packet by the transmitter is recorded in an information field, and the node  1  receives the sending packet, acquires the transmission latency of 0.5 ms from the receiver to the node  1 , acquires the processing latency of 1 ms of processing the sending packet and updates 1 ms recorded by the transmitter into 2.5 ms. The node  2  receives the sending packet, acquires the transmission latency of 0.6 ms from the node  1  to the node  2 , acquires the processing latency of 1.1 ms of processing the sending packet and updates 2.5 ms recorded by the node  1  into 4.2 ms. The receiver receives the sending packet, acquires the transmission latency of 0.4 ms from the node  2  to the receiver and the processing latency of 1.2 ms of processing the sending packet, acquires 14.2 recorded in the sending packet and adds 4.2 ms, 0.4 ms and 1.2 ms to obtain a time value for determining the latency from the transmitter to the receiver. 
     When at least one of the processing latency or transmission latency acquired by each node is not obtained through absolute time, it is also necessary to acquire the synchronization time offset between the transmitter and the receiver, wherein the synchronization time offset between the transmitter and the receiver may be calculated according to the synchronization time offset between any two nodes between the transmitter and the receiver. When the previous node of the intermediate node is asynchronous with the intermediate node, the node may determine the synchronization time offset with the previous node and record the synchronization time offset in the sending packet. 
     In the example, when recording the synchronization time offset with the previous node in the sending packet, each node may independently record it and may also record it in combination with at least one of the processing latency or the transmission latency. 
     In at least one embodiment, the sending packet further includes at least one of a latency requirement, a receiver list or a feedback object. 
     In the example, when the sending packet includes the latency requirement, the receiver may determine whether the latency meets the latency requirement and feed back to the feedback object whether the latency from the transmitter to the receiver meets the latency requirement. 
     In the example, when the sending packet does not include the latency requirement, the receiver may directly feed back the latency from the transmitter to the receiver to the feedback object. In an alternative example, according to the latency requirement acquired in another manner (for example, a latency requirement configured by a network device), the receiver may determine whether the latency meets the latency requirement and feed back to the feedback object whether the latency from the transmitter to the receiver meets the latency requirement. 
     In the example, the feedback object of the latency may be the transmitter and may also be a third-party entity, for example, the network device. 
     In at least one embodiment, the transmitter receives configuration information sent by the third-party entity. The configuration information is configured to instruct the transmitter to transmit the sending packet including the time indication information to the receiver. 
     In at least one embodiment, the transmitter transmits the sending packet to the receiver through a Uu interface or a D2D interface. 
     Therefore, in the embodiment of the disclosure, the time indication information is added into the sending packet, such that the latency from the transmitter to the receiver is acquired accurately. 
       FIG. 2  is a schematic block diagram of a communication device  200  according to an embodiment of the disclosure. As illustrated in  FIG. 2 , the communication device includes a processing unit  210  and a transmitting unit  220 . The processing unit  210  adds time indication information into a sending packet, wherein the time indication information is configured for a receiver to acquire latency from the communication device  200  to the receiver. The transmitting unit  220  is configured to transmit the sending packet to the receiver. 
     In at least one embodiment, the sending packet may be a PDCP packet, an RLC packet or a MAC packet. 
     In at least one embodiment, the time indication information may include a starting time of processing the sending packet by the communication device  200  or includes a processing latency of processing the sending packet by the communication device  200 . 
     In at least one embodiment, the processing unit  210  may further be configured to determine QoS of a service corresponding to the latency from the communication device  200  to the receiver to be acquired. The transmitting unit  220  may be specifically configured to transmit the sending packet to the receiver according to the corresponding QoS. 
     In at least one embodiment, the transmitting unit  220  may be specifically configured to: transmit the sending packet to the receiver through multiple paths. 
     In at least one embodiment, the sending packet is a data packet or a probing packet dedicated for latency detection. 
     In at least one embodiment, the sending packet further includes at least one of a latency requirement, a receiver list or a feedback object. 
     In at least one embodiment, as illustrated in  FIG. 2 , the communication device  200  further includes a receiving unit  230 . The receiving unit  230  may be configured to: receive a feedback message of the receiver, wherein the feedback message may be configured to indicate the latency from the communication device  200  to the receiver or configured to indicate whether the latency from the communication device  200  to the receiver meets the latency requirement. 
     In at least one embodiment, as illustrated in  FIG. 2 , the communication device  200  further includes a receiving unit  230 . The receiving unit  230  may be configured to: receive configuration information sent by a third-party entity, wherein the configuration information may be configured to instruct the communication device  200  to transmit the sending packet including the time indication information to the receiver. 
     In at least one embodiment, the transmitting unit  220  may be specifically configured to transmit the sending packet to the receiver through a Uu interface or a D2D interface. 
     It should be understood that the communication device  200  may correspond to the abovementioned transmitter, may realize corresponding functions of the transmitter and will not be elaborated herein for simplicity. 
       FIG. 3  is a schematic block diagram of a communication device  300  according to an embodiment of the disclosure. As illustrated in  FIG. 3 , the communication device  300  includes a receiving unit  310  and a processing unit  320 . The receiving unit  310  is configured to receive a sending packet sent by a transmitter, wherein the sending packet includes time indication information. The processing unit  320  is configured to determine latency from the transmitter to the communication device  300  according to the time indication information. 
     In at least one embodiment, the sending packet is a PDCP packet, an RLC packet or a MAC packet. 
     In at least one embodiment, the time indication information includes a starting time of processing the sending packet by the transmitter. The processing unit  320  may be specifically configured to determine an ending time of processing the sending packet by the transmitter and determine the latency from the transmitter to the communication device  300  according to a difference between the ending time and the starting time. 
     In at least one embodiment, the time indication information may include a processing latency of processing the sending packet by the transmitter, include a processing latency of processing the sending packet by any intermediate node between the transmitter and the communication device  300  and include a transmission latency between the intermediate node and a previous node of the intermediate node, the transmission latency being acquired by the intermediate node. 
     The processing unit  320  may be specifically configured to determine a processing latency of processing the sending packet by the communication device  300  and a transmission latency between the communication device  300  and a previous node of the communication device  300 , and determine the latency from the transmitter to the communication device  300  according to a sum of the processing latency of processing the sending packet by the transmitter, the processing latency of processing the sending packet by the intermediate node between the transmitter and the communication device  300 , the transmission latency between the intermediate node and the previous node of the intermediate node, the processing latency of processing the sending packet by the communication device  300  and the transmission latency between the communication device  300  and the previous node of the communication device  300 . 
     In at least one embodiment, processing latency of processing the sending packet by different nodes may be carried in different information fields of the sending packet, and transmission latency between different nodes and respective previous nodes of the different nodes may be carried in different information fields of the sending packet. The processing latency and the transmission latency acquired by the same node may be carried in different information fields of the sending packet. 
     In at least one embodiment, the time indication information may include the processing latency of processing the sending packet by the transmitter and include a sum of the processing latency of processing the sending packet by an intermediate node between the transmitter and the communication device  300  and the acquired transmission latency between the intermediate node and a previous node of the intermediate node. 
     The processing unit  320  may be specifically configured to determine the processing latency of processing the sending packet by the communication device  300  and the transmission latency between the communication device  300  and the previous node of the communication device  300 , and determine the latency from the transmitter to the communication device  300  according to a sum of the processing latency of processing the sending packet by the transmitter, the sum of the processing latency of processing the sending packet by the intermediate node and the acquired transmission latency between the intermediate node and the previous node of the intermediate node, the processing latency of processing the sending packet by the communication device  300  and the transmission latency between the communication device  300  and the previous node of the communication device  300 . 
     In at least one embodiment, sums of the processing latency of processing the sending packet by different nodes and the acquired transmission latency between different nodes and respective previous nodes of the different nodes may be carried in different information fields of the sending packet. 
     In at least one embodiment, the time indication information may include a sum of the processing latency of processing the sending packet by the transmitter, the processing latency of processing the sending packet by an intermediate node between the transmitter and the communication device  300  and the transmission latency between the intermediate node and a previous node of the intermediate node. 
     The processing unit  320  may be specifically configured to determine the processing latency of processing the sending packet by the communication device  300  and the transmission latency between the previous node of the communication device  300  and the communication device  300 , and determine the latency from the transmitter and the communication device  300  according to a sum of the processing latency of processing the sending packet by the transmitter, the transmission latency between the previous node of the communication device  300  and the communication device  300 , and the sum of the processing latency of processing the sending packet by the transmitter, the processing latency of processing the sending packet by the intermediate node between the transmitter and the communication device  300  and the transmission latency between the intermediate node and the previous node of the intermediate node. 
     In at least one embodiment, the latency may include a synchronization time offset between the transmitter and the communication device  300 . 
     In at least one embodiment, the processing unit  320  may further be configured to: calculate the synchronization time offset between the transmitter and the communication device  300  according to synchronization time offsets of adjacent nodes prior to the communication device  300  and a synchronization time offset between the previous node of the communication device  300  and the communication device  300 . The synchronization time offsets may be recorded in the time indication information. 
     In at least one embodiment, the receiving unit  310  may be specifically configured to receive the sending packet sent by the transmitter through multiple paths. 
     The processing unit  320  may be specifically configured to determine latency of each path in the multiple paths from the transmitter to the communication device  300 . 
     In at least one embodiment, as illustrated in  FIG. 3 , the device may further a transmitting unit  330 . 
     The processing unit  320  may further be configured to determine whether the latency from the transmitter to the communication device  300  meets a latency requirement. The transmitting unit  330  may be configured to transmit a feedback message to the transmitter or a third-party entity, wherein the feedback message may be configured to indicate whether the latency from the transmitter to the communication device  300  meets the latency requirement. 
     Alternatively, the transmitting unit  330  may be configured to transmit the latency to the transmitter or the third party. 
     In at least one embodiment, the sending packet further includes at least one of the latency requirement, a communication device  300  list or a feedback object. 
     In at least one embodiment, the receiving unit  310  is specifically configured to: receive the sending packet through a Uu interface or a D2D interface. 
     It should be understood that the communication device  300  may correspond to the abovementioned receiver, may realize corresponding functions of the receiver and will not be elaborated herein for simplicity. 
       FIG. 4  is a schematic block diagram of a communication device  400  according to an embodiment of the disclosure. As illustrated in  FIG. 4 , the communication device  400  includes a receiving unit  410 , a processing unit  420  and a transmitting unit  430 . The receiving unit  410  is configured to receive a sending packet from a transmitter, wherein the sending packet is sent to a receiver. The processing unit  420  is configured to add a processing latency of processing the sending packet and a transmission latency between a previous node and the communication device into the sending packet. The transmitting unit  430  is configured to transmit the sending packet to the receiver. 
     In at least one embodiment, the processing unit  420  may further be configured to, responsive to determining that the previous node of the communication device is asynchronous with the communication device, determine a synchronization time offset between the communication device and the previous node and add the synchronization time offset into the sending packet. 
     In at least one embodiment, the processing unit  420  may be specifically configured to: add the processing latency and the transmission latency acquired by the communication device into information fields, wherein the information fields may be different from information fields including a processing latency and a transmission latency added by other node, and the processing latency and transmission the latency added by the communication device may be located in different information fields; or add a sum of the processing latency and the transmission latency acquired by the communication device into an information field, wherein the information field may be different from an information field including a sum of the processing latency and the transmission latency added by other node; or add the sum of the processing latency and the transmission latency by accumulating a time value indicated by the time indication information in the sending packet, wherein the time value indicated by the time indication information may represent a sum of a processing latency of processing the sending packet by the transmitter, a processing latency of processing the sending packet by an intermediate node between the transmitter and the communication device and a transmission latency between the transmitter and the previous node of the communication device. 
     It should be understood that the communication device  400  may correspond to the abovementioned intermediate node, may realize corresponding functions of the intermediate node and will not be elaborated herein for simplicity. 
       FIG. 5  is a schematic block diagram of a communication device  500  according to an embodiment of the disclosure. As illustrated in  FIG. 5 , the communication device  500  includes a processor  510 , a memory  520  and a transceiver  530 . In at least one embodiment, the communication device further includes a bus system  540 , and the bus system is configured to interconnect the processor  510 , the memory  520  and the transceiver  530 . The memory  520  is configured to store an instruction, and the processor  510  is configured to call the instruction stored in the memory  520  to execute corresponding operations. 
     In at least one embodiment, the communication device  500  illustrated in  FIG. 5  may execute corresponding operations of a transmitter mentioned in the embodiments of the disclosure, or may execute corresponding operations of a receiver mentioned in the embodiments of the disclosure or may execute corresponding operations of an intermediate node mentioned in the embodiments of the disclosure. 
     For convenient understanding, descriptions will be made below with execution of the corresponding operations of the transmitter by the communication device  500 . 
     The processor  510  calls a code in the memory  520  to execute the following operations: adding time indication information into a sending packet, wherein the time indication information is configured for a receiver to acquire latency from the transmitter to the receiver, and transmitting the sending packet to the receiver through the transceiver  530 . 
     In at least one embodiment, the sending packet is a PDCP packet, an RLC packet or a MAC packet. 
     In at least one embodiment, the time indication information includes a starting time of processing the sending packet by the transmitter or includes a processing latency of processing the sending packet by the transmitter. 
     In at least one embodiment, the processor  510  calls the code in the memory  520  to specifically execute the following operations: determining QoS of a service corresponding to the latency from the transmitter to the receiver to be acquired, and transmitting, the sending packet to the receiver according to the corresponding QoS through the transceiver  530 . 
     In at least one embodiment, the processor  510  calls the code in the memory  520  to specifically execute the following operation: transmitting the sending packet to the receiver through multiple paths by the transceiver  530 . 
     In at least one embodiment, the sending packet is a data packet or a probing packet dedicated for latency detection. 
     In at least one embodiment, the sending packet further includes at least one of a latency requirement, a receiver list or a feedback object. 
     In at least one embodiment, the processor  510  calls the code in the memory  520  to specifically execute the following operation: receiving a feedback message of the receiver through the transceiver  530 , wherein the feedback message is configured to indicate the latency from the transmitter to the receiver or configured to indicate whether the latency from the transmitter to the receiver meets the latency requirement. 
     In at least one embodiment, the processor  510  calls the code in the memory  520  to specifically execute the following operation: receiving configuration information sent by a third-party entity through the transceiver  530 , wherin the configuration information is configured to instruct the transmitter to send the transmitting packet including the time indication information to the receiver. 
     In at least one embodiment, the processor  510  calls the code in the memory  520  to specifically execute the following operation: transmitting the sending packet to the receiver through a Uu interface or a D 2 D interface by the transceiver  530 . 
     Descriptions will be made below with execution of the corresponding operations of the receiver by the communication device  500 . 
     The processor  510  calls the code in the memory  520  to execute the following operations: receiving a sending packet sent by a transmitter through the transceiver  530 , wherein the sending packet includes time indication information, and determining latency from the transmitter to the receiver according to the time indication information. 
     In at least one embodiment, the sending packet is a PDCP packet, an RLC packet or a MAC packet. 
     In at least one embodiment, the time indication information includes a starting time of processing the sending packet by the transmitter. 
     The processor  510  calls the code in the memory  520  to execute the following operations: determining an ending time of processing the sending packet by the transmitter and determining the latency from the transmitter to the receiver according to a difference between the ending time and the starting time. 
     In at least one embodiment, the time indication information includes a processing latency of processing the sending packet by the transmitter, includes a processing latency of processing the sending packet by any intermediate node between the transmitter and the receiver and includes a transmission latency between the intermediate node and a previous node of the intermediate node, the transmission latency being acquired by the intermediate node. 
     The processor  510  calls the code in the memory  520  to execute the following operations: determining a processing latency of processing the sending packet by the receiver and a transmission latency between the receiver and a previous node of the receiver, and determining the latency from the transmitter to the receiver according to a sum of the processing latency of processing the sending packet by the transmitter, the processing latency of processing the sending packet by the intermediate node between the transmitter and the receiver, the transmission latency between the intermediate node and the previous node of the intermediate node, the processing latency of processing the sending packet by the receiver and the transmission latency between the receiver and the previous node of the receiver. 
     In at least one embodiment, processing latency of processing the sending packet by different nodes are carried in different information fields of the sending packet, transmission latency between different nodes and respective previous nodes of the different nodes are carried in different information fields of the sending packet, and the processing latency and transmission latency acquired by the same node are carried in different information fields of the sending packet. 
     In at least one embodiment, the time indication information includes the processing latency of processing the sending packet by the transmitter and includes a sum of the processing latency of processing the sending packet by an intermediate node between the transmitter and the receiver and an acquired transmission latency between the intermediate node and a previous node of the intermediate node. 
     The processor  510  calls the code in the memory  520  to execute the following operations: determining the processing latency of processing the sending packet by the receiver and the transmission latency between the receiver and the previous node of the receiver, and determining the latency from the transmitter to the receiver according to a sum of the processing latency of processing the sending packet by the transmitter, the sum of the processing latency of processing the sending packet by the intermediate node and the acquired transmission latency between the intermediate node and the previous node of the intermediate node, the processing latency of processing the sending packet by the receiver and the transmission latency between the receiver and the previous node of the receiver. 
     In at least one embodiment, sums of the processing latency of processing the sending packet by different nodes and the acquired transmission latency between different nodes and respective previous nodes of the different nodes are carried in different information fields of the sending packet. 
     In at least one embodiment, the time indication information includes a sum of the processing latency of processing the sending packet by the transmitter, the processing latency of processing the sending packet by an intermediate node between the transmitter and the receiver and the transmission latency between the intermediate node and a previous node of the intermediate node. 
     The processor  510  calls the code in the memory  520  to execute the following operations: determining the processing latency of processing the sending packet by the receiver and the transmission latency between the previous node of the receiver and the receiver, and determining the latency from the transmitter to the receiver according to a sum of the processing latency of processing the sending packet by the transmitter, the transmission latency between the previous node of the receiver and the receiver and the sum of the processing latency of processing the sending packet by the transmitter, the processing latency of processing the sending packet by the intermediate node between the transmitter and the receiver and the transmission latency between the intermediate node and the previous node of the intermediate node. 
     In at least one embodiment, the latency includes a synchronization time offset between the transmitter and the receiver. 
     In at least one embodiment, the processor  510  calls the code in the memory  520  to execute the following operation: calculating the synchronization time offset between the transmitter and the receiver according to synchronization time offsets of adjacent nodes prior to the receiver and a synchronization time offset between the previous node of the receiver and the receiver, wherein the synchronization time offsets are recorded in the time indication information. 
     In at least one embodiment, the processor  510  calls the code in the memory  520  to execute the following operation: receiving, by the receiver, the sending packet sent by the transmitter, including: receiving the sending packet sent by the transmitter through multiple paths by the transceiver  530 , and determining latency of each of the multiple paths from the transmitter to the receiver. 
     In at least one embodiment, the processor  510  calls the code in the memory  520  to execute the following operations: determining whether the latency from the transmitter to the receiver meets a latency requirement and transmitting a feedback message to the transmitter or a third-party entity through the transceiver  530 , wherein the feedback message is configured to indicate whether the latency from the transmitter to the receiver meets the latency requirement; or transmitting the latency to the transmitter or the third party through the transceiver  530 . 
     In at least one embodiment, the sending packet further includes at least one of the latency requirement, a receiver list or a feedback object. 
     In at least one embodiment, the processor  510  calls the code in the memory  520  to execute the following operation: receiving the sending packet through a Uu interface or a D2D interface through the transceiver  530 . 
     Descriptions will be made below with execution of the corresponding operations of the intermediate node by the communication device  500 . 
     The processor  510  calls the code in the memory  520  to execute the following operations: receiving a sending packet from a transmitter through the transceiver  530 , wherein the sending packet is sent to a receiver; adding a processing latency of processing the sending packet and a transmission latency between a previous node and the intermediate node into the sending packet; and transmitting the sending packet to the receiver through the transceiver  530 . 
     In at least one embodiment, the processor  510  calls the code in the memory  520  to execute the following operations: responsive to determining that the previous node of the intermediate node is asynchronous with the intermediate node, determining a synchronization time offset between the intermediate node and the previous node and adding the synchronization time offset into the sending packet. 
     In at least one embodiment, the processor  510  calls the code in the memory  520  to execute the following operation: adding the processing latency and transmission latency acquired by the intermediate node into information fields, wherein the information fields are different from information fields including a processing latency and a transmission latency added by other node, and the processing latency and transmission latency added by the communication node are located in different information fields; or adding a sum of the processing latency and transmission latency acquired by the communication node into an information field, wherein the information field is different from an information field including a sum of the processing latency and the transmission latency added by other node; or adding the sum of the processing latency and the transmission latency by accumulating a time value indicated by the time indication information in the sending packet, wherein the time value indicated by the time indication information represents a sum of a processing latency of processing the sending packet by the transmitter, a processing latency of processing the sending packet by an intermediate node between the transmitter and the communication node and a transmission latency between the transmitter and the previous node of the communication node. 
     Those of ordinary skill in the art may realize that the units and algorithm operations of each example described in combination with the embodiments disclosed in the disclosure may be implemented by electronic hardware or a combination of computer software and the electronic hardware. Whether these functions are executed in a hardware or software manner depends on specific applications and design constraints of the technical solutions. Professionals may realize the described functions for each specific application by use of different methods, but such realization shall fall within the scope of the disclosure. 
     Those skilled in the art may clearly learn about that specific working processes of the system, device and unit described above may refer to the corresponding processes in the method embodiment and will not be elaborated herein for convenient and brief description. 
     In some embodiments provided by the disclosure, it should be understood that the disclosed system, device and method may be implemented in another manner. For example, the device embodiment described above is only schematic, and for example, division of the units is only logic function division, and other division manners may be adopted during practical implementation. For example, multiple units or components may be combined or integrated into another system, or some characteristics may be neglected or not executed. In addition, coupling or direct coupling or communication connection between each displayed or discussed component may be indirect coupling or communication connection, implemented through some interfaces, of the device or the units, and may be electrical and mechanical or adopt other forms. 
     The units described as separate parts may or may not be physically separated, and parts displayed as units may or may not be physical units, and namely may be located in the same place, or may also be distributed to multiple network units. Part or all of the units may be selected to achieve the purpose of the solutions of the embodiments according to a practical requirement. 
     In addition, each function unit in each embodiment of the disclosure may be integrated into a processing unit, each unit may also exist independently, and two or more than two units may also be integrated into a unit. 
     When being realized in form of software functional unit and sold or used as an independent product, the function may also be stored in a computer-readable storage medium. Based on such an understanding, the technical solutions of the disclosure substantially or parts making contributions to the conventional art or part of the technical solutions may be embodied in form of software product, and the computer software product is stored in a storage medium, including a plurality of instructions configured to enable a computer device (which may be a personal computer, a server, network equipment or the like) to execute all or part of the operations of the method in each embodiment of the disclosure. The abovementioned storage medium includes: various media capable of storing program codes such as a U disk, a mobile hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk. 
     The above is only the specific implementation mode of the disclosure and not intended to limit the scope of protection of the disclosure. Any variations or replacements apparent to those skilled in the art within the technical scope disclosed by the disclosure shall fall within the scope of protection of the disclosure. Therefore, the scope of protection of the disclosure shall be subject to the scope of protection of the claims.