WO2011137783A1 - Data processing method, apparatus and system - Google Patents

Abstract

A data processing method, apparatus and system are disclosed by the embodiments of the present invention. The method of the present invention includes: obtaining group information, which includes a group identifier, a sequence number of a machine terminal in the group and a position of configuration parameters in broadcasting messages, wherein the parameters are for common wireless bearer corresponding to the group; according to the group information, determining the common wireless bearer corresponding to the group, wherein the group is the one to which the machine terminal belongs, and when it is determined that the machine terminal needs to access a network, generating a Media Access Control (MAC) Packet Data Unit (PDU) and a Radio Link Control (RLC) PDU, then transferring the MAC PDU and RLC PDU to a common user surface entity via the common wireless bearer. With the application of the solution, the header overhead can be saved, and thereby the processing complexity can be reduced and the transmission efficiency can be improved.

Description

 Data processing method, device and system

The present application claims priority to Chinese Patent Application No. 201010257821.5, entitled "A Data Processing Method, Apparatus, and System", filed on August 12, 2010, the entire contents of which is incorporated herein by reference. In the application.

The present invention relates to the field of communications technologies, and in particular, to a data processing method, apparatus, and system.

BACKGROUND OF THE INVENTION The Internet of Things refers to the connection of all items to the Internet through information sensing devices for intelligent identification and management. Machine-to-machine (M2M) communication is an interpretation of the Internet of Things from a communication perspective. It provides a convenient way to establish real-time data between systems, between remote devices, and with individuals. Realize business process automation and intelligence in the earth.

 With the widespread deployment of M2M applications, the number of users of these applications is rapidly becoming large, because the amount of data sent by a device type communication (MTC) device is relatively small, even smaller than the accumulated headers of each layer. Overhead, so from the overall point of view, user plane transmission efficiency is extremely low. In addition to the header overhead of the Protocol Data Unit (PD U), the existing access network (RAN, Residential Access Network) needs to establish a corresponding wireless for each machine terminal (MTC devices). The Link Control Protocol Layer (RLC, Radio Link Control) entity, because of the large number of MTC devices, maintaining so many RLC entities places higher demands on the processing capabilities of the RAN.

For an M2M application that has a small amount of transmission data and a fixed number of machine terminals, the prior art needs to consume more network resources, and the transmission efficiency is lower, and the processing is lower. To be complicated.

SUMMARY OF THE INVENTION Various aspects of the present invention provide a data processing method, apparatus, and system that can save network resources, improve transmission efficiency, and reduce processing complexity.

 An aspect of the present invention provides a data processing method, including:

 Obtaining group information, where the group information includes a group identifier, a serial number of the machine terminal in the group, and a location of the public radio bearer configuration parameter corresponding to the group in the broadcast message;

 Determining, according to the grouping information, a public radio bearer (RB, Radio Bearer) corresponding to the group to which the machine terminal belongs;

 Generating a Media Access Control Protocol Layer (MAC, Media Access Control) PDU and an RLC PDU;

 The MAC PDU and the RLC PDU are transmitted by the public radio to a shared user plane entity established by the public user group machine terminal.

 Another aspect of the present invention provides a data processing method, including:

 Obtaining grouping information of the machine terminal according to the preset policy, where the group information includes a group identifier, a serial number of the machine terminal in the group, and a location of the corresponding public radio bearer configuration parameter of the group in the broadcast message;

 Notifying the machine terminal of the group information;

 The MAC PDU and the RLC PDU transmitted by the receiver terminal through the public radio bearer according to the packet information.

 Another aspect of the present invention provides a machine terminal, including:

 An obtaining unit, configured to acquire group information, where the group information includes a group identifier, a sequence number of the machine terminal in the group, and a location of the public radio bearer configuration parameter corresponding to the group in the broadcast message;

 a determining unit, configured to determine, according to the group information acquired by the acquiring unit, a public radio bearer corresponding to the group to which the machine terminal belongs;

 a generating unit, configured to generate a MAC PDU and an RLC PDU;

a sending unit, configured by the generating unit, by the public radio bearer determined by the determining unit The MAC PDU and the RLC PDU are transmitted to a public user plane entity, which is a shared user plane entity established by the network side device for a group of machine terminals transmitted over the public radio bearer.

 Another aspect of the present invention provides a network side device, including:

 a grouping unit, configured to obtain grouping information of the machine terminal according to the preset policy, where the grouping information includes a group identifier, a serial number of the machine terminal in the group, and a location of the corresponding public radio bearer configuration parameter of the group in the broadcast message;

 a notification unit, configured to notify the machine terminal of the grouping information obtained by the grouping unit, and a receiving unit, configured by the MAC PDU and the RLC PDU sent by the receiver terminal according to the grouping information

 Another aspect of the present invention provides a communication system, including any of the machine terminals and any network side device provided by the embodiments of the present invention.

 In the embodiment of the present invention, the machine terminals are grouped according to a preset policy, and the machine terminals in the group share a radio bearer, so that the machine terminals in the group can only correspond to one public.

RLC entity, without having to establish a corresponding PLC entity for each machine terminal, while saving network resources, it can also omit some header information of MAC PDU and RLC PDU, such as omitting logical channel identifier (LCH-ID, logic channel IDentity The information or the number of bytes of the information is reduced, so that the header overhead can be saved relative to the prior art, thereby reducing processing complexity and improving transmission efficiency.

BRIEF DESCRIPTION OF THE DRAWINGS In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings to be used in the embodiments or the description of the prior art will be briefly described below, and obviously, in the following description The drawings are only some of the embodiments of the present invention, and those skilled in the art can obtain other drawings based on these drawings without any creative work.

 1 is a flowchart of a data processing method according to Embodiment 1 of the present invention;

 2 is a flowchart of a data processing method according to Embodiment 2 of the present invention;

3 is a schematic diagram of a scenario of a data processing method according to an embodiment of the present invention; 4 is a schematic structural diagram of a MAC PDU and an RLC PDU according to Embodiment 3 of the present invention; FIG. 5 is a schematic structural diagram of a MAC PDU and an RLC PDU according to Embodiment 4 of the present invention; FIG. 6 is a MAC PDU according to Embodiment 5 of the present invention; FIG. 7 is a schematic structural diagram of a MAC PDU and an RLC PDU according to Embodiment 6 of the present invention; FIG. 7b is another schematic structural diagram of a MAC PDU and an RLC PDU according to Embodiment 6 of the present invention; A schematic structural diagram of a machine terminal provided by another embodiment of the present invention;

 FIG. 8b is another schematic structural diagram of a machine terminal according to another embodiment of the present invention; FIG. 8c is another schematic structural diagram of a machine terminal according to another embodiment of the present invention; FIG. 9a is another embodiment of the present invention; FIG. 9 is a schematic diagram of another structure of a network side device according to another embodiment of the present invention; FIG. 9 is a schematic structural diagram of another network side device according to another embodiment of the present invention; FIG. 9 is a schematic structural diagram of another network side device according to another embodiment of the present invention; FIG. 9 is a schematic structural diagram of another network side device according to another embodiment of the present invention; FIG. 9f is another schematic diagram of the present invention; A further schematic structural diagram of a network side device provided by an embodiment.

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. example. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

 In the MTC communication, the terminal can be divided into a machine terminal (i.e., MTC Device) and a terminal used by an ordinary user (for convenience of description, the terminal used by the ordinary user is hereinafter referred to as an ordinary terminal). The machine terminal can be specifically a vending machine, a meter reading device, etc. With the extensive deployment of the M2M application, the number of machine terminals is gradually increasing, and communication of a large number of machine terminals will affect the communication of the mobile terminal, for example, because the machine communication takes up More radio resources, so the service success rate and call quality of the mobile phone are reduced, and so on. Therefore, machine communication should be avoided to occupy too much radio resources to ensure the normal communication quality of the ordinary terminal.

Embodiments of the present invention provide a data processing method, apparatus, and system. The details are described below separately. Embodiment 1

 This embodiment will be described from the perspective of the transmitting end, that is, the machine terminal.

 A data processing method includes: acquiring packet information, determining that a MAC PDU and an RLC PDU are generated when accessing a network, determining a public radio bearer corresponding to a group to which the machine terminal belongs according to the packet information, and determining a MAC PDU by using the determined public radio bearer The RLC PDU is delivered to the public user plane entity. The group information includes the group identifier, the serial number of the machine terminal in the group, and the location of the public radio bearer configuration parameter of the group in the broadcast message. The public user plane entity is the network side device transmitting the public radio bearer. A shared set of user plane entities established by a group of machine terminals.

 Referring to Figure 1, the specific process is as follows.

 And obtaining the group information, where the group information includes a group identifier (ID, IDentity), a serial number of the machine terminal in the group, and a location of the public radio bearer configuration parameter of the group in the broadcast message, and may also include the group. Information such as the start time of the initiation of the access.

 For example, the machine terminal can obtain the group information from the network side, that is, the network side groups the machine terminals according to the preset policy to obtain the group information, and then the network side sends the group information to each machine terminal through a dedicated connection or paging. And other related equipment.

 For another example, the machine terminals may be grouped according to a preset policy by the network side to obtain packet information, and then the group information is directly configured on the machine terminal.

 102. Determine, according to the group information, a public radio bearer corresponding to the group to which the machine terminal belongs.

 In the embodiment of the present invention, the machine terminals in all the groups share one radio bearer. For convenience of description, the shared radio bearer is referred to as a public radio bearer, and the public radio bearer may be a static radio broadcast by a broadcast message. Bearer, all in-group machine terminals can read the relevant configuration belonging to the public radio bearer from the broadcast message according to the "location of the public radio bearer configuration parameter corresponding to the group in the broadcast message" in the group information, and at a specified time Initiate access at the point.

 103. Generate a MAC PDU and an RLC PDU; the MAC PDU and the RLC PDU are MAC PDUs and RLC PDUs suitable for an Internet of Things application; for example, any one of the following methods may be adopted.

 (1) Both the MAC layer and the RLC layer do not have a split function.

Only one MAC PDU and one RLC PDU are generated in one transmission, that is, one transmission is a complete Internet Protocol (IP) packet, so the header of the MAC PDU can include only the Service Data Unit (SDU) of the MAC. Length indication, and In the prior art, the transmission sequence number (TSN), the split indication status (SS, Segmentation Status), and the LCH-ID may be omitted, and the RLC PDU may be in a transparent mode (TM, Transparent Mode). Structure, does not require RLC retransmission, does not require a header.

 (2) The MAC layer does not have a split function, and the RLC layer has a split function.

 One transmission generates one MAC PDU and at least one RLC PDU, that is, the length of the fixed RLC PDU, but the number of RLC PDUs is not limited, and then, at the MAC layer, all RLC PDUs are concatenated in one transmission time interval (TTI, Transmission Time). Interval) is performed; since only one MAC PDU is generated in one transmission, the header of the MAC PDU can also omit the information such as the TSN, the split indication, and the LCH-ID in the prior art, similarly to (1). The header of the MAC PDU at this time includes the number of MAC SDUs, instead of the length indication of the MAC SDU; at this time, the RLC PDU can adopt the structure of the Unacknowledged Mode (UM), and the RLC retransmission is also not required; The header of the RLC PDU includes a sequence number (SN, Sequence Number) for sorting and a length of data other than the padding bits.

 (3) The MAC layer has a split function, and the RLC layer does not have a split function.

 One transmission generates one RLC PDU and at least one MAC PDU, that is, the RLC PDU may not need to be sorted, and the MAC PDU needs to be sorted, so the header of the MAC PDU includes only the TSN for sorting, the split indication, and the length indication of the MAC SDU. The RLC PDU can adopt a transparent mode structure, does not require RLC retransmission, and does not require a header.

 (4) Both the MAC layer and the RLC layer have a split function.

 The one transmission generates at least one MAC PDU and at least one RLC PDU, that is, both the RLC PDU and the MAC PDU need to be ordered, so the header of the MAC PDU includes only the TSN for the sorting, the split indication, and the length indication of the MAC SDU, and the RLC PDU With the unacknowledged mode structure, RLC retransmission is not required; wherein the header of the RLC PDU includes only the length of the data for the SN and the padding bits for sorting.

In addition, the header of the MAC PDU may further include a device ID. For example, if the MAC layer needs to perform some control according to the machine terminal, such as time advance (TA, Time Advance) maintenance, the above four methods are used. The header of the MAC PDU may also include a machine terminal identifier. However, if the MAC layer does not need to maintain the TA, the machine terminal identifier is not required. Alternatively, if the physical resource allocation mode enables the public user plane entity to determine, by using information such as radio bearer, code channel, time, etc., which machine terminal the MAC PDU belongs to, for example, Broadcast according to the machine terminal It is recognized that each machine terminal is configured to send uplink data so that the machine terminals do not overlap each other when transmitting uplink data, and the network can infer which machine terminal transmits data according to the data arrival time. It is also possible to not require a machine terminal identification. In addition to the method of fixing whether the machine terminal identifier exists, an indication for indicating whether the machine terminal identifier exists may be carried in the header of the MAC PDU.

 It should be noted that if there are at least two logical channels, the header of the MAC PDU may further include an LCH-ID indicating the used logical channel, but the LCH-ID bit (bit) relative to the prior art. The number can be reduced accordingly.

 104. Transmit the MAC PDU and the RLC PDU to the public user entity by using the determined public radio, where the user plane entity includes a MAC layer (ie, a MAC entity) and an RLC layer (ie, an RLC entity).

 Optionally, if the data needs to be encrypted, the header of the PDU may also carry the random number COUNT for decryption. For example, the method may further include the following steps.

 The MAC PDU is encrypted at the MAC layer, and the packet header of the MAC PDU further includes a random number COUNT for decryption. Alternatively, the RLC PDU is encrypted at the RLC layer, and the header of the RLC PDU further includes a decryption. Random number COUNT and / or machine terminal identification.

 It can be seen that the embodiment of the present invention adopts the grouping of the machine terminals according to the preset policy, and allows the machine terminals in the group to share one radio bearer, so that the machine terminals in the group can only correspond to one common RLC entity, without being required for each A machine terminal establishes a corresponding PLC entity to save network resources, and may also omit some header information of the MAC PDU and the RLC PDU, such as omitting information such as LCH-ID or reducing the number of bits of the information, so In the prior art, the header overhead can be saved, thereby reducing processing complexity and improving transmission efficiency.

 In addition, since the radio resources occupied by the communication of the machine terminal are reduced, the influence of the communication of the machine terminal on the ordinary terminal can be reduced, which is advantageous for ensuring the communication quality of the ordinary terminal. Embodiment 2

This embodiment is described from the perspective of a receiving end, that is, a network side device, where the network side device includes at least a public user plane entity, and may further include a control plane entity. The public user plane entity is a shared user plane entity established by the network side device for a group of machine terminals transmitted through the public radio bearer; and the public radio bearer refers to one radio bearer shared by all terminals in each group. A data processing method includes: obtaining packet information of a machine terminal according to a preset policy, notifying the group information to the machine terminal, and the MAC address and the RLC PDU sent by the receiver device according to the packet information through the public radio bearer, the MAC address The PDU and RLC PDU are processed. The group information may include the group identifier, the serial number of the machine terminal in the group, and the location of the public radio bearer configuration parameter of the group in the broadcast message.

 Referring to Figure 2, the specific process can be as follows.

 201. Obtain packet information of the machine terminal according to the preset policy, that is, group the machine terminals according to the preset policy, thereby obtaining group information.

 The preset policy can be set according to the requirements of the actual application, for example, according to the location of each machine terminal and/or the attribute of the server, etc., and the like.

 The group information includes a group identifier, a sequence number of the machine terminal in the group, and a location of the public radio bearer configuration parameter of the group in the broadcast message, and may also include information such as a start time of the group to initiate the access.

 202. Notify the machine terminal of the group information.

 For example, packet information can be delivered to individual machine terminals and other related devices via a dedicated connection or paging.

 203. The MAC PDU and the RLC PDU sent by the receiver terminal through the public radio bearer according to the packet information.

 It should be noted that, in the embodiment of the present invention, the machine terminals in all the groups share a radio bearer, which is called a public radio bearer, and the public radio bearer may be a static radio bearer broadcast by a broadcast message, in all groups. The machine terminal can read the related configuration belonging to the public radio bearer from the broadcast message according to the “location of the public radio bearer configuration parameter corresponding to the group in the broadcast message” in the group information, and initiate the access at the specified time point. .

 Since the machine terminals in the group share one radio bearer, the machine terminals in the group can only correspond to one common RLC entity, and it is not necessary to establish a corresponding PLC entity for each machine terminal, thereby saving network resources and also saving network resources. Some header information of the MAC PDU and the RLC PDU may be omitted. Further, the data processing method may further include 204.

 204. Process the received MAC PDU and the RLC PDU. For example, the details can be as follows.

(1) If the machine terminal transmits only one MAC PDU and one RLC PDU in one transmission, the header of the MAC PDU includes only the length indication of the MAC SDU, and the RLC PDU is transparent. For the structure of the explicit mode, the MAC PDU and the RLC PDU are processed as follows: The MAC PDU is parsed according to the length of the MAC SDU and submitted to the upper layer; the RLC PDU is parsed and directly submitted to the upper layer.

 (2) If the machine terminal transmits one MAC PDU and at least one RLC PDU in one transmission, wherein the header of the MAC PDU includes only the number of MAC SDUs, and the RLC PDU adopts a structure of non-acknowledgment mode, the header of the RLC PDU is only included for sorting. If the length of the data is outside the SN and the padding bits, the MAC PDU and the RLC PDU are processed as follows: The MAC PDU is parsed according to the number of MAC SDUs and submitted to the upper layer; and the data is based on the sequence number SN and the padding bits. The length of the RLC PDU is parsed, sorted, and concatenated and submitted to the upper layer.

 (3) If the machine terminal transmits one RLC PDU and at least one MAC PDU in one transmission, wherein the header of the MAC PDU includes only the TSN for the sorting, the split indication, and the length indication of the MAC SDU, and the RLC PDU adopts a transparent mode structure. The MAC PDU and the RLC PDU are processed as follows: parsing, sorting, and concatenating the MAC PDU according to the transmission sequence number TSN, the split indication, and the length indication of the MAC SDU, and submitting to the upper layer; and performing the RLC PDU Parse and submit to the upper layer.

 (4) If the machine terminal transmits at least one RLC PDU and at least one MAC PDU in one transmission, wherein the header of the MAC PDU includes only the TSN for the sorting, the split indication, and the length indication of the MAC SDU, and the RLC PDU adopts the non-acknowledge mode. The structure, if the header of the RLC PDU includes only the length of the data for the SN and the padding bit, the MAC PDU and the RLC PDU are processed as follows: According to the TSN, the split indication, and the length of the MAC SDU, the MAC is indicated. The PDU is parsed, sorted, and concatenated, and submitted to the upper layer. The RLC PDU is parsed, sorted, and concatenated according to the length of the sequence number SN and the padding bits, and submitted to the upper layer.

 In addition, if the data is encrypted, the public user plane entity also needs to decrypt the PDU. For example, if the machine terminal encrypts the data at the MAC layer, the packet header of the MAC PDU may further include a random number COUNT for decryption. At this time, processing the MAC PDU and the RLC PDU (ie, step 204) may further include: decrypting the MAC PDU according to the random number COUNT at the MAC.

If the machine terminal encrypts the data at the RLC layer, the header of the RLC PDU may further include a random number COUNT and/or a machine terminal identifier for decryption, and then processing the MAC PDU and the RLC PDU (ie, step 204) further includes: The RLC PDU is decrypted according to the random number COUNT at the RLC. In addition, the packet header of the MAC PDU may further include a machine terminal identifier. Then, the MAC layer of the network side device may also perform some operations controlled by the machine terminal according to the machine terminal identifier, such as time advance maintenance, and optionally, the MAC PDU. The packet header may also be used to indicate whether the identifier of the machine terminal is present, and the network side device further needs to determine the indication, that is, the step 204 may further include:

 The machine terminal identifier in the MAC PDU header is read when it is determined that the machine terminal identifier exists according to the indication for indicating whether the machine terminal identifier exists.

 Otherwise, if it is determined that the machine terminal identifier does not exist, it indicates that there is no machine terminal identifier in the MAC PDU header, and then the subsequent header information, such as the TSN, the split indication, or the length indication of the MAC SDU, can be directly read.

 The sending of the packet and the packet information (ie, step 201 and step 202) may be performed by the control plane entity in the network side device, and the receiving and processing of the PDU (ie, step 203 and steps are known from the above, the embodiment of the present invention) The machine terminals are grouped according to a preset policy, and the machine terminals in the group share a radio bearer, so that the machine terminals in the group can only correspond to one common RLC entity without establishing a corresponding one for each machine terminal. The PLC entity can save some network headers, and can also omit some header information of the MAC PDU and the RLC PDU, for example, omitting information such as LCH-ID or reducing the number of bits of the information, so the header overhead can be saved compared with the prior art. , which can reduce processing complexity and improve transmission efficiency.

 In addition, since the radio resources occupied by the communication of the machine terminal are reduced, the influence of the communication of the machine terminal on the ordinary terminal can be reduced, which is advantageous for ensuring the communication quality of the ordinary terminal. Embodiment 3

 The method described in the first and second embodiments will be described in detail below by way of example.

 First, the network side groups the machine terminals according to the preset policy. The preset policy can be set according to the requirements of the actual application, for example, according to the location of each machine terminal and/or the attribute of the server, etc., etc. . After the grouping, the packet information is sent to each machine terminal through a dedicated connection or paging, and the delivered content may include a group identifier, a sequence number of the device in the group, and a corresponding public radio bearer configuration parameter of the group in the broadcast message. The location and other information may also include the start time of the group to initiate the access and the like.

The machine terminals in all the groups share a radio bearer configuration, and the radio bearer It may be a static radio bearer broadcast by a broadcast message, and the machine terminals in all groups read the radio bearer configuration parameters belonging to the group from the broadcast message through the pre-obtained information, and initiate the access at a specified time point. For the control plane public radio bearer establishment process, refer to the prior art, and details are not described herein again.

 In order to save the processing resources of the access network, and to fully utilize the service characteristics of the MTC service, the small amount of data, and the allowable failure rate, all the machine terminals in each group can correspond to one public RLC entity and correspond to one MAC. entity. For convenience of description, in the embodiment of the present invention, the public RLC entity and the MAC entity are collectively referred to as a common user plane entity.

 Regardless of whether the equipment in the group adopts a competitive or non-contention-based access method, the data between different machine terminals does not need to maintain a certain order in L2, and the data between the machine terminals can be sent to the core network in an out-of-order manner, and the application layer guarantees the data and The mapping relationship of the machine terminal.

 Referring to FIG. 3, it can be seen from FIG. 3 that for a common user plane entity (ie, a common RAN), if the application layer data of one machine terminal is not divided by the MAC layer and/or the RLC layer, no direct ordering is required. Go to the upper level. If it is split, it is sorted at the layer that has been split, and then submitted. Two PDUs of the machine terminal 6 of the MAC layer in the figure: PDU1 of the machine terminal 6 and PDU2 of the machine terminal 6, and two PDUs of the machine terminal 2 of the RLC layer: PDU1 of the machine terminal 2 and PDU2 of the machine terminal 2; Other PDUs, such as the machine terminal 1, the machine terminal 3, the machine terminal 4, the machine terminal 7, and the machine terminal n, do not need to be sorted, but are directly submitted.

 In most application scenarios, since the data volume of each machine terminal is the same and fixed, the full transparent mode can be adopted when the amount of data is small, that is, the PDU is not split at the MAC layer and the RLC, which can greatly improve the efficiency. Of course, it is also possible to divide at the RLC layer and/or the MAC layer. Although such gain is not high in the full transparent mode, the number of bits of the header information can be much smaller as compared with the prior art. For these various application scenarios, the following will be described in detail in other embodiments (for example, Embodiment 3), and in Embodiments 4, 5 and 6.

In this embodiment, the MAC layer and the RLC layer on the machine terminal side have no split function, that is, each machine terminal can only generate one MAC PDU and one RLC PDU in one transmission, and one transmission is a complete IP data packet, so that It is not necessary to ensure the sequential delivery between machine terminals, but the application layer to distinguish the machine terminals. That is, the machine terminal determines the public radio bearer in which the group to which the own (ie, the machine terminal) belongs according to the grouping information, and sets the MAC according to the public radio bearer. After the PDU and the RLC PDU are transmitted to the public user plane entity, the public user plane entity may not directly sort the received MAC PDU and the RLC PDU, but directly submit.

 In order to adapt to the reporting requirements of different application scenarios, the size of the RLC PDU is not fixed in the machine terminal, but in a flexible manner, and the selection function of the TFC (Transport Format Combination) of the MAC is also required. Make certain changes so that they do not consider their maximum available power, but rather support the choice of transport block length beyond the power limit. Although there is some impact on performance, many operations can be omitted, such as sorting, etc., so that the overall performance is improved relative to the prior art.

 (1) MAC layer on the machine terminal side

 Since the MTC service is singular, the data transmission phase of the sender can use only one logical channel. In this case, the LCH-ID may not be carried in the header of the MAC PDU generated by the machine terminal, and the MAC layer does not perform data. Split, so the header of the MAC PDU may not carry the TSN and split indication in the existing system, but only need to be included to indicate that the MAC is small.

 Of course, if at least two logical channels are set, the LCH-ID needs to be added in the header of the MAC PDU, but the number of bits of the LCH-ID can be reduced accordingly.

 In addition, if the MAC layer of the Long Term Evolution (LTE) system needs to perform some control according to the machine terminal, such as TA maintenance, the machine terminal identifier may also be carried in the header of the MAC PDU. However, if the MAC layer does not need to maintain the TA, the machine terminal identifier is not required. Alternatively, if the physical resource allocation mode enables the public user plane entity to determine, by using information such as radio bearer, code channel, time, etc., which machine terminal the MAC PDU belongs to, for example, The broadcast configures the time for transmitting the uplink data for each machine terminal according to the machine terminal identifier, so that the machine terminals do not overlap each other when transmitting the uplink data, and the network can infer which machine terminal sends the data according to the data arrival time, then . It is also possible to not require a machine terminal identification.

 In addition to the method of fixing the presence of the machine terminal identity, an indication for indicating the presence or absence of the machine terminal identity may be carried in the header of the MAC PDU, such as indicator bit I.

 (2) The MAC layer of the public user plane entity

If the LCH-ID is not included in the header of the received MAC PDU, that is, the machine terminal side adopts the LCH-ID-free mode, the MAC layer of the public user plane entity does not need the logical channel mapping in the existing system, if received The header of the MAC PDU contains the LCH-ID, so the public user is The body needs to increase the logical channel mapping function.

 Since the MAC layer on the machine terminal side does not divide the data, after receiving the MAC PDU, the public user plane entity does not need to reordering and demultiplexing the MAC PDU, and does not need to perform string join on the MAC PDU, but After parsing, submit directly to the upper layer.

 In addition, if the MAC layer of the LTE system needs to perform some control according to the machine terminal, such as TA maintenance, then the machine terminal identifier needs to be acquired at this time, and then the control according to the machine terminal identifier or the TA maintenance is performed, as described in the current technology. I will not repeat them here. The machine terminal identifier may be obtained in multiple manners. For example, if the packet header of the MAC PDU carries the machine terminal identifier, the machine terminal identifier is extracted from the packet header of the MAC PDU. If the packet header of the MAC PDU does not carry the machine terminal identifier, It is possible to determine which machine terminal the MAC PDU belongs to by information such as radio bearers, code channels, and time.

 If the indication bit I is also carried in the header of the MAC PDU, the public user plane entity also needs to interpret the indication bit I at the MAC layer and determine whether the machine terminal exists.

 (3) RLC layer on the machine terminal side

 The structure of the RLC PDU generated by the terminal of the machine may adopt a transparent mode structure, and the retransmission may be handed over to the application layer and the HARQ. Therefore, the MAC layer may not need to be retransmitted, that is, the RLC PDU does not need the packet header and is directly transmitted to the public user. The RLC layer of the polygon entity.

 Of course, since the data is not split at the RLC layer, the size of the RLC PDU is not fixed, but a workaround is adopted, so that the transparent mode structure supports different RLC PDU sizes.

 (4) RLC layer of public user plane entity

 Since the RLC layer on the machine terminal side does not split the data, the public user plane entity does not need to sort the RLC PDUs after the RLC PDUs are received, and does not need to join the MAC PDUs in series, but directly submits them to the upper layer.

 (5) Encryption

 In the LTE system, if encryption is required, and the encryption algorithm is placed in the PDCP layer, the header of the RLC PDU generated by the machine terminal needs to carry the machine terminal identifier, so that the public user plane entity can learn from the upper layer according to the machine terminal identifier. Decrypting (Key) information, and then decrypting the received RLC PDU according to the decryption information; of course, if the public user plane entity can determine which machine terminal the RLC PDU belongs to by radio bearer, code channel, time, etc., No need to carry the machine terminal identification.

For W system encryption, it can be placed in the RLC layer or the MAC layer. If encryption is placed on the MAC layer, After the machine terminal generates the MAC PDU, the packet header of the MAC PDU also needs to carry the machine terminal identifier and the random number COUNT for decryption. If the encryption is placed in the RLC layer, after the machine terminal generates the RLC PDU, the packet header of the RLC PDU also needs to carry the machine terminal identifier and the random number COUNT for decryption. Wherein, the random number COUNT is randomly generated by the machine terminal. Similarly, if the public user plane entity can determine which machine terminal the RLC PDU belongs to by radio bearer, code channel, time, etc., the MAC PDU or the header of the RLC PDU may not need to carry the machine terminal identifier.

 In order to better understand the above description, FIG. 4 shows the structure of the MAC PDU and the RLC PDU. It should be noted that FIG. 4 illustrates that there is no encryption and only one logical channel exists. Wherein, the dotted line indicates that the information can also be omitted.

 It can be seen that the embodiment of the present invention adopts the grouping of the machine terminals according to the preset policy, and allows the machine terminals in the group to share one radio bearer, so that the machine terminals in the group can only correspond to one common RLC entity, without being required for each A machine terminal establishes a corresponding PLC entity to save network resources. Moreover, in this embodiment, since there is no need to split the data in the MAC layer and the RLC layer, there is no need to carry the TSN and the split in the header of the MAC PDU. The information is indicated, and the RLC PDU does not need the packet header at all, so the overhead of the packet header can be greatly saved as a whole, and the processing complexity and the transmission efficiency can be reduced compared with the prior art.

 In addition, since the radio resources occupied by the communication of the machine terminal are reduced, the influence of the communication of the machine terminal on the ordinary terminal can be reduced, which is advantageous for ensuring the communication quality of the ordinary terminal. Embodiment 4

 Different from the third embodiment, in this embodiment, the MAC layer on the machine terminal side does not have the split function, and the RLC layer has the split function, that is, each machine terminal can only generate one MAC PDU in one transmission, but The number of RLC PDUs is not limited. At this point, the RLC length can be fixed, and the MAC layer needs to concatenate all generated RLC PDUs in one TTI. The RLC PDUs of the RLC layer need to be ordered, and the MAC PDUs of the MAC layer do not need to be sorted.

 (1) MAC layer on the machine terminal side

 The specific processing of the MAC layer of the machine terminal is similar to that of the third embodiment. The difference is only that: because the length of the RLC PDU is fixed, the number of MAC SDUs can be used instead of the L domain. For details, refer to the third embodiment, which is not mentioned here.

(2) MAC layer of public user plane entity The specific processing of the MAC layer of the public user plane entity is similar to that of the third embodiment except that the number of MAC SDUs N needs to be used to identify how many fixed length MAC SDUs are included in the MAC PDU. For other descriptions, refer to Embodiment 3, and details are not described herein again.

 (3) RLC layer on the machine terminal side

 The RLC PDU structure of the machine terminal can adopt the PDU structure of the non-acknowledgment mode, and does not require RLC retransmission. The header of the generated RLC PDU needs to include the sequence number SN for sorting and the length of the data other than the padding bit, and may also include a machine terminal identifier, and the machine terminal identifier may not specifically adopt the wireless network temporarily used in the prior art. Identification (RNTI, Radio Network Temporary Identifier), etc., but a number assigned by the system to the machine terminal according to the size of the group, and the number of bits of the serial number SN can also be reduced accordingly to save the header overhead.

 If the public user plane entity can determine which machine terminal the MAC PDU belongs to by radio bearer, code channel, time, etc., for example, by broadcasting, the time for transmitting the uplink data is configured for each machine terminal according to the machine terminal identifier, so that the machine terminal When the uplink data is transmitted, they do not overlap each other, and the network can infer which machine terminal transmits the data according to the data arrival time. It is also possible not to require the machine terminal identification, but to inform the RLC layer by the MAC layer by associating the machine terminal of each RLC PDU.

 (4) RLC layer of public user plane entity

 The RLC layer of the public user plane entity parses, sorts, and concatenates the RLC PDU according to the length of the sequence number SN and the padding bits, and submits it to the upper layer.

 It should be noted that since all the RLC PDUs transmitted at one time are encapsulated in one MAC PDU, if the decapsulation can be performed in the order of the MAC PDUs, the order reorganization can be guaranteed. The serial number SN is required. However, if the group member is too large, the RLC entity maintains too many sorting queues, which leads to an increase in the processing capacity of the RLC entity.

 (5) Encryption

 In the LTE system, if encryption is required, and the encryption algorithm is placed in the PDCP layer, the header of the RLC PDU generated by the machine terminal needs to carry the machine terminal identifier, so that the public user plane entity can learn from the upper layer according to the machine terminal identifier. Decrypting the information, and then decrypting the received RLC PDU according to the decryption information; of course, if the public user plane entity can determine which machine terminal the RLC PDU belongs to by the radio bearer, code channel, time, etc., it may not need to carry Machine terminal identification.

For W system encryption, it can be placed at the RLC layer, due to the header of the RLC PDU in this embodiment. The SN needs to be included in the SN, so the method of calculating the COUNT by using the SN and the Hyper Frame Number (HFN) in the prior art can be used. Therefore, the RLC PDU does not need to carry the COUNT, but only needs to carry the machine terminal identifier. . Similarly, if the public user plane entity can determine which machine terminal the RLC PDU belongs to by radio bearer, code channel, time, etc., the packet header of the RLC PDU may not need to carry the machine terminal identifier.

 For the W system encryption, it can also be placed at the MAC layer. For details, refer to the third embodiment, and details are not described herein.

 In order to better understand the above description, FIG. 5 shows the structure of the MAC PDU and the RLC PDU. It should be noted that FIG. 5 illustrates that there is no encryption and only one logical channel exists. Wherein, the dotted line indicates that the information can also be omitted.

 It can be seen that the embodiment of the present invention adopts the grouping of the machine terminals according to the preset policy, and allows the machine terminals in the group to share one radio bearer, so that the machine terminals in the group can only correspond to one common RLC entity, without being required for each A machine terminal establishes a corresponding PLC entity to save network resources. Moreover, in this embodiment, since there is no need to divide the data at the MAC layer, it is not necessary to carry information such as TSN and split indication in the header of the MAC PDU. The RLC layer needs to be divided, but the number of bits of information such as the SN carried by the packet header of the RLC PDU can be reduced compared with the prior art, so that the overhead of the packet header can be saved as a whole, and the processing complexity can be reduced compared with the prior art. Degree and improve transmission efficiency.

 In addition, since the radio resources occupied by the communication of the machine terminal are reduced, the influence of the communication of the machine terminal on the ordinary terminal can be reduced, which is advantageous for ensuring the communication quality of the ordinary terminal. Embodiment 5

 Different from the previous embodiment, in this embodiment, the RLC layer of the machine terminal does not have a split function, and the MAC layer has a split function, that is, each machine terminal can generate only one RLC PDU in one transmission, and the MAC The number of PDUs is not limited. At this time, since the RLC packet may be large, the RLC PDU size may not be fixed, but a flexible PDU size (ie, flexible PDU size) may be adopted to adapt to different reporting requirements. The RLC PDUs of the RLC layer do not need to be ordered, and the MAC PDUs of the MAC layer need to be ordered.

 (1) MAC layer on the machine terminal side

Since the MTC service is singular, the data transmission phase of the sender can use only one logical channel. In this case, the header of the MAC PDU generated by the machine terminal may not be carried. LCH-ID; In addition, since the MAC layer needs data to be split, the header of the MAC PDU needs to carry a TSN, a split indication, and an L field for indicating the size of the MAC SDU, where the L domain

The header of the MAC PDU may also include the machine terminal identifier. If the MAC layer of the LTE system needs to perform some control according to the machine terminal, such as TA maintenance, the machine terminal identifier is also required. However, if the physical resource allocation manner enables the public user plane entity to determine, by using information such as radio bearer, code channel, time, etc., which machine terminal the MAC PDU belongs to, for example, by broadcasting, the time for transmitting the uplink data is configured for each machine terminal according to the machine terminal identifier. , so that the machine terminals do not overlap each other when transmitting uplink data, the network can infer which machine terminal sends data according to the data arrival time, then. It is also possible to not require a machine terminal identification.

 Of course, if at least two logical channels are set, the LCH-ID needs to be added in the header of the MAC PDU, but the number of bits of the LCH-ID can be reduced accordingly.

 In addition to the method of fixing the presence of the machine terminal identity, an indication for indicating the presence or absence of the machine terminal identity may be carried in the header of the MAC PDU, such as indicator bit I.

 (2) The MAC layer of the public user plane entity

 If the LCH-ID is not included in the header of the received MAC PDU, that is, the machine terminal side adopts the LCH-ID-free mode, the MAC layer of the public user plane entity does not need the logical channel mapping in the existing system, if received The LCH-ID is included in the header of the MAC PDU, and the public user plane entity needs to add the logical channel mapping function.

 Since the MAC layer of the machine terminal side divides the data, after the public user plane entity receives the MAC PDU, the MAC layer of the public user plane entity needs to set a sort queue for each machine terminal, according to the machine terminal identifier, or according to the physical resource. Corresponding to the device, the received MAC PDU is sent to the corresponding sorting queue for sorting, and is serialized and recombined before being submitted to the upper layer.

 If the indication bit I is also carried in the header of the MAC PDU, the public user plane entity also needs to interpret the indication bit I at the MAC layer and determine whether the machine terminal exists.

 In addition, if the MAC layer of the LTE system needs to perform some control according to the machine terminal, such as TA maintenance, then control or TA maintenance is required at this time. For details, refer to the current technology, and details are not described herein.

 (3) RLC layer on the machine terminal side:

The structure of the RLC PDU generated on the machine terminal side can adopt a transparent mode structure. The third embodiment is not described here.

 (4) The RLC layer of the public user plane entity:

 Since the RLC layer on the machine terminal side does not split the data, the public user plane entity does not need to sort the RLC PDUs after the RLC PDUs are received, and does not need to join the MAC PDUs in series, but directly submits them to the upper layer.

 (5) Encryption

 The encryption process is the same as that of the third embodiment. For details, refer to the third embodiment, and details are not described herein again.

 The following figure shows the structure of the MAC layer (assuming that the MAC layer needs to use the device ID to distinguish the Queue's ordering queue). Since the RLC layer is completely transparent, the structure diagram will not be described.

 In order to better understand the above description, FIG. 6 shows the structure of the MAC PDU and the RLC PDU. It should be noted that FIG. 6 illustrates that there is no encryption and only one logical channel exists. Wherein, the dotted line indicates that the information can also be omitted.

 It can be seen that the embodiment of the present invention adopts the grouping of the machine terminals according to the preset policy, and allows the machine terminals in the group to share one radio bearer, so that the machine terminals in the group can only correspond to one common RLC entity, without being required for each A machine terminal establishes a corresponding PLC entity to save network resources. Moreover, in this embodiment, since there is no need to split the data in the RLC, there is no need to need header information in the RLC PDU, but the MAC layer needs to use the data. The number of bits of the information such as the TSN and the split indication carried in the header of the MAC PDU can be reduced compared with the prior art, so that the overhead of the header can be saved as a whole, so the present embodiment is used in comparison with the prior art. The solution of the example can greatly reduce the overhead of the packet, thereby reducing the processing complexity and improving the transmission efficiency.

 In addition, since the radio resources occupied by the communication of the machine terminal are reduced, the influence of the communication of the machine terminal on the ordinary terminal can be reduced, which is advantageous for ensuring the communication quality of the ordinary terminal. Embodiment 6

 In this embodiment, both the MAC layer and the RLC layer support the splitting function, that is, each machine terminal can generate at least two RLC PDUs and MAC PDUs in one transmission, that is, the number of RLC PDUs and MAC PDUs is not limited. At this time, the RLC layer can adopt a fixed RLC PDU size, and the MAC layer serially or splits the RLC PDU according to channel conditions. The specific processing can be as follows: (1) MAC layer on the machine terminal side

It can be implemented in two ways, as described below. The first mode is as follows: The packet header of the MAC PDU needs to carry the TSN, the split indication, the L-domain and the machine terminal identifier used to indicate the size of the MAC SDU. The number of bits in the L-domain can be reduced according to the specific application.

 The second mode: the packet header of the MAC PDU may not carry the TSN, the split indication, and the L domain for indicating the size of the MAC SDU, but carries the number of MAC SDUs N and the machine terminal identifier, but it is required to impose a rule on the RLC PDU. Perform the segmentation.

 The second way, compared to the first one, can save the overhead of the header, and does not need to be sorted at the MAC layer, but is sorted at the RLC layer.

 Since the MTC service is singular, the data transmission phase of the sender may use only one logical channel. In this case, the LCH-ID may not be carried in the header of the MAC PDU generated by the machine terminal; of course, if at least two logical channels are set, , you need to add the LCH-ID to the header of the MAC PDU, but the number of bits of the LCH-ID can be reduced accordingly.

 It should be noted that, if the physical resource allocation manner enables the public user plane entity to determine, by using information such as radio bearer, code channel, time, etc., which machine terminal the MAC PDU belongs to, for example, by sending, according to the machine terminal identifier, each machine terminal is configured to send. The time of the uplink data is such that the machine terminals do not overlap each other when transmitting the uplink data, and the network can infer which machine terminal transmits the data according to the data arrival time. The MAC PDU may also not need to carry the machine terminal identification.

 In addition to the method of fixing the presence of the machine terminal identity, an indication for indicating the presence or absence of the machine terminal identity may be carried in the header of the MAC PDU, such as indicator bit I.

 (2) The MAC layer of the public user plane entity

 After receiving the MAC PDU, the MAC layer of the public user plane entity needs to sort and concatenate the MAC PDUs sent by the machine terminal according to the TSN, the split indication, the L domain, and the machine terminal identifier, and then submit to the upper layer. If there is only one logical channel in the data transmission phase of the sender, then the logical channel mapping in the prior art is not required at this time.

 (3) RLC layer on the machine terminal side

 The specific processing manner is the same as that in the fourth embodiment. For details, refer to the fourth embodiment, and details are not described herein again. (4) RLC layer of public user plane entity

 The specific processing manner is the same as that in the fourth embodiment. For details, refer to the fourth embodiment, and details are not described herein again. (5) Encryption

The specific processing manner is the same as that in the fourth embodiment. For details, refer to the fourth embodiment, and details are not described herein again. In order to better understand the above description, FIG. 7a and FIG. 7b show the structure of the MAC PDU and the RLC PDU of this embodiment. It should be noted that both FIG. 7a and FIG. 7b do not need to be encrypted and only one logical channel exists. The example is explained. Wherein, the dotted line indicates that the information can also be omitted. In Figure 7a, the MAC PDU structure corresponds to the first processing mode. The MAC PDU structure is similar to that in Figure 6, except that an L domain is assigned to each MAC SDU that is concatenated in one MAC PDU. The MAC PDU structure in Figure 7b corresponds to the second processing mode. The MAC PDU structure is the same as that in Figure 5, and the RLC PDUs in Figures 7a and 7b are the same as those in Figure 5.

 It can be seen that the embodiment of the present invention adopts the grouping of the machine terminals according to the preset policy, and allows the machine terminals in the group to share one radio bearer, so that the machine terminals in the group can only correspond to one common RLC entity, without being required for each A machine terminal establishes a corresponding PLC entity to save network resources. In this embodiment, although data needs to be split at both the MAC layer and the RLC layer, each information carried in the packet header of the MAC PDU and the RLC PDU can be reduced. The number of bits, and the header of the MAC PDU does not need to carry the LCH-ID. Therefore, although the gain is not the third, fourth, and fifth embodiments, the header overhead is also reduced compared with the prior art. It can reduce processing complexity and improve transmission efficiency.

 In addition, since the radio resources occupied by the communication of the machine terminal are reduced, the influence of the communication of the machine terminal on the ordinary terminal can be reduced, which is advantageous for ensuring the communication quality of the ordinary terminal. Example VII.

 In order to better implement the above method, an embodiment of the present invention further provides a machine terminal. Referring to FIG. 8a, the machine terminal includes an obtaining unit 701, a generating unit 702, a determining unit 703, and a sending unit 704.

 The obtaining unit 701 is configured to obtain the group information, where the group information includes a group identifier, a serial number of the machine terminal in the group, and a location of the public radio bearer configuration parameter of the group in the broadcast message. Information such as the start time of the entry.

 For example, the network terminal may be grouped according to a preset policy by the network side to obtain packet information, and then the packet information is sent by the network side to the acquiring unit 701 of each machine terminal and related other devices through a dedicated connection or paging.

 For another example, the machine terminals may be grouped according to a preset policy by the network side to obtain packet information, and then the group information is directly configured on the machine terminal.

a determining unit 702, configured to determine, according to the group information acquired by the obtaining unit 701, a machine terminal The public radio bearer corresponding to the group;

 In the embodiment of the present invention, the machine terminals in all the groups share one radio bearer. For convenience of description, the shared radio bearer is referred to as a public radio bearer, and the public radio bearer may be a static radio broadcast by a broadcast message. Bearer, all in-group machine terminals can read the relevant configuration belonging to the public radio bearer from the broadcast message according to the "location of the public radio bearer configuration parameter corresponding to the group in the broadcast message" in the group information, and at a specified time Initiate access at the point.

 a generating unit 703, configured to generate a MAC PDU and an RLC PDU; the MAC PDU and the RLC PDU are MAC PDUs and RLC PDUs suitable for an Internet of Things application;

 The sending unit 704 is configured to transmit, by the public radio bearer determined by the determining unit 703, the MAC PDU and the RLC PDU generated by the generating unit 703 to the public user plane entity, where the public user plane entity is the network side device transmits the public radio bearer A shared set of user plane entities established by a group of machine terminals.

 The generating unit 703 is specifically a first generating module, or a second generating module, or a third generating module, or a fourth generating module;

 The first generation module is configured to generate one MAC PDU and one RLC PDU in one transmission when the MAC layer and the RLC layer of the machine terminal side do not set the splitting function, where the header of the MAC PDU includes only the length indication of the MAC SDU, RLC The PDU adopts a transparent mode structure; that is, the information such as the TSN, the split indication, and the LCH-ID in the header of the prior art MAC PDU can be omitted, and the RLC PDU does not need the header, and does not require RLC retransmission. See the previous embodiment.

 a second generation module, configured to not set a split function on the MAC layer of the machine terminal side, and when the RLC layer sets the split function, generate one MAC PDU and at least one RLC PDU in one transmission, where the header of the MAC PDU includes only the MAC SDU The number of RLC PDUs is in a non-acknowledgment mode. The header of the RLC PDU includes only the sequence number SN for sorting and the length of data other than the padding bits; that is, the TSN, split indication, and LCH in the header of the prior art MAC PDU. The information such as -ID can be omitted, and the RLC PDU also does not need RLC retransmission. Moreover, the sequence number SN carried by the RLC PDU header and the number of bits of the length of the data other than the padding bit can be appropriately reduced, see the previous embodiment. .

a third generation module, configured to set a split function on the MAC layer of the machine terminal side, and when the RLC layer does not set the split function, generate one RLC PDU and at least one MAC PDU in one transmission, where the header of the MAC PDU is only included for Sorted transmission sequence number TSN, split indication and MAC The length of the SDU indicates that the RLC PDU adopts a transparent mode structure; that is, the information such as the LCH-ID in the header of the prior art MAC PDU can be omitted, and the RLC PDU does not need the header, and does not require RLC retransmission, see the previous embodiment.

 And a fourth generating module, configured to generate at least one MAC PDU and at least one RLC PDU in one transmission when the MAC layer and the RLC layer of the machine terminal side respectively set the splitting function, where the header of the MAC PDU includes only the transmission for sorting The serial number TSN, the split indication, and the length indication of the MAC SDU, the RLC PDU adopts a structure of a non-acknowledgment mode, and the header of the RLC PDU includes only the sequence number SN for sorting and the length of data other than the padding bits. That is, the information such as the LCH-ID in the header of the prior art MAC PDU can be omitted, and the RLC PDU does not need the RLC retransmission, and the sequence number SN carried by the RLC PDU header and the number of bits of the length of the data other than the padding bit can be performed. For a suitable reduction, see the previous embodiment.

 As shown in Figure 8b, the machine terminal can also include a first encryption unit 705.

 The first encryption unit 705 is configured to encrypt the generated MAC PDU at the MAC layer.

 Then, the header of the MAC PDU generated by the generating unit 703 further includes a random number COUNT for decryption.

 Alternatively, as shown in Figure 8c, the machine terminal may also include a second encryption unit 706.

 The second encryption unit 706 is configured to encrypt the generated RLC PDU at the RLC layer.

 The header of the RLC PDU generated by the generating unit 703 further includes a random number COUNT and/or a machine terminal identifier for decryption.

 In addition, the header of the MAC PDU generated by the generating unit 703 may further include a machine terminal identifier. For example, if the MAC layer needs to perform some control according to the machine terminal, such as TA maintenance, the header of the MAC PDU may further include a machine terminal identifier. . However, if the MAC layer does not need to maintain the TA, the machine terminal identifier is not required. Alternatively, if the physical resource allocation mode enables the public user plane entity to determine, by using information such as radio bearer, code channel, time, etc., which machine terminal the MAC PDU belongs to, for example, The broadcast configures the time for transmitting the uplink data for each machine terminal according to the machine terminal identifier, so that the machine terminals do not overlap each other when transmitting the uplink data, and the network side device can infer which machine terminal sends the data according to the data arrival time. , then. It is also not necessary to identify the machine terminal. In addition to the method of fixing whether the machine terminal identifier exists, an indication for indicating whether the machine terminal identifier exists may be carried in the header of the MAC PDU.

It should be noted that, if there are at least two logical channels, the header of the MAC PDU generated by the generating unit 703 may further include an LCH-ID for indicating the adopted logical channel, but In the prior art, the number of bits of the LCH-ID can be correspondingly reduced, so even then, the header overhead can be reduced compared to the prior art.

 For the specific implementation of the above various units, refer to the foregoing embodiments, and details are not described herein again.

 It can be seen that the embodiment of the present invention adopts the grouping of the machine terminals according to the preset policy, and allows the machine terminals in the group to share one radio bearer, so that the machine terminals in the group can only correspond to one common RLC entity, without being required for each A machine terminal establishes a corresponding PLC entity, so that after the acquisition unit 701 of the machine terminal acquires the group information, most of the information in the prior art may be omitted in the header of the MAC PDU and the RLC PDU generated by the generating unit 703 or The number of bits, such as omitting the information such as the LCH-ID or reducing the number of bits of the information, etc., so that compared with the prior art, the network overhead can be saved, the header overhead can be saved, and the processing complexity can be reduced. And improve transmission efficiency.

 In addition, since the radio resources occupied by the communication of the machine terminal are reduced, the influence of the communication of the machine terminal on the ordinary terminal can be reduced, which is advantageous for ensuring the communication quality of the ordinary terminal. Example VIII.

 Correspondingly, the embodiment of the present invention further provides a network side device. As shown in FIG. 9a, the network side device includes a grouping unit 801, a notification unit 802, and a receiving unit 803.

 The grouping unit 801 is configured to obtain grouping information of the machine terminal according to the preset policy, where the group information includes a group identifier, a serial number of the machine terminal in the group, and a location of the corresponding public radio bearer configuration parameter of the group in the broadcast message. ; It can also include information such as the start time of the group to initiate access.

 The preset policy can be set according to the requirements of the actual application, for example, according to the location of each machine terminal and/or the attribute of the server, etc., and the like.

 The notifying unit 802 is configured to notify the machine terminal of the packet information obtained by the grouping unit 801. For example, notification unit 802 can deliver the packet information to various machine terminals and associated other devices via dedicated connections or paging.

 The receiving unit 803 is configured to send, by the receiver terminal, the MAC PDU and the RLC PDU sent by the public radio bearer according to the packet information.

It should be noted that, in the embodiment of the present invention, the machine terminals in all the groups share a radio bearer, which is called a public radio bearer, and the public radio bearer may be a static radio bearer broadcast by a broadcast message, in all groups. The machine terminal can according to the group information in the group information The location of the appropriate public radio bearer configuration parameter in the broadcast message "reads the relevant configuration belonging to the public radio bearer from the broadcast message and initiates the access at the specified point in time.

 Referring to FIG. 9f, the network side device may further include a processing unit 804.

 The processing unit 804 is configured to process the MAC PDU and the RLC PDU received by the receiving unit 803.

 If the MAC layer and the RLC layer on the terminal side of the machine do not set the split function, the machine terminal generates only one MAC PDU and one RLC PDU in one transmission. The header of the MAC PDU includes the length indication of the MAC SDU, and the RLC PDU adopts the transparent mode. The structure, that is, the information such as the TSN, the split indication, and the LCH-ID in the header of the prior art MAC PDU can be omitted, and the RLC PDU does not need the header, and does not require the RLC retransmission. Referring to the foregoing embodiment, the processing unit 804 specifically The first MAC processing sub-unit A 8041 and the first RLC processing sub-unit A 8042 may be included. Referring to FIG. 9b, the first MAC processing sub-unit A8041 is configured to parse and submit the MAC PDU received by the receiving unit 803 according to the length of the MAC SDU. Give the upper layer.

 The first RLC processing sub-unit A8042 is configured to directly submit the RLC PDU received by the receiving unit 803 to the upper layer.

 If the MAC layer of the machine terminal side does not set the split function, and the RLC layer sets the split function, the machine terminal transmits one MAC PDU and at least one RLC PDU at a time, wherein the header of the MAC PDU includes the number of MAC SDUs, and the RLC PDU The structure of the non-acknowledgment mode is adopted, and the header of the RLC PDU includes the sequence number SN for sorting and the length of the data other than the padding bit, that is, the TSN, the split indication, and the LCH-ID in the header of the prior art MAC PDU are all It can be omitted, and the RLC PDU also does not need RLC retransmission. Moreover, the sequence number SN carried by the RLC PDU header and the number of bits of the length of the data other than the padding bit can be appropriately reduced. Referring to the foregoing embodiment; The processing unit 804 may specifically include a second MAC processing sub-unit B8041 and a second RLC processing sub-unit B8042, see FIG. 9c.

 The second MAC processing sub-unit B8041 is configured to parse and submit the MAC PDU received by the receiving unit 803 according to the number of MAC SDUs to the upper layer.

 The second RLC processing sub-unit B8042 is configured to parse, sort, and recombine the RLC PDU received by the receiving unit 803 according to the length of the data other than the sequence number SN and the padding bit, and submit to the upper layer.

The MAC layer on the machine terminal side sets the split function. If the RLC layer does not set the split function, the machine terminal transmits one RLC PDU and at least one MAC PDU at a time, where the MAC PDU is generated. The packet header includes a transmission sequence number TSN for sorting, a split indication, and a length indication of the MAC SDU, and the RLC PDU adopts a transparent mode structure, that is, information such as LCH-ID in the prior art MAC PDU header can be omitted, and RLC is omitted. The PDU does not need a packet header, and does not require RLC retransmission. Referring to the foregoing embodiment, the processing unit 804 may specifically include a third MAC processing sub-unit C8041 and a third RLC processing sub-unit C8042, see FIG. 9d.

 The third MAC processing sub-unit C8041 is configured to parse, sort, and recombine the MAC PDU received by the receiving unit 803 according to the transmission sequence number TSN, the split indication, and the length indication of the MAC SDU, and submit the same to the upper layer.

 The third RLC processing sub-unit C8042 is configured to submit the RLC PDU received by the receiving unit 803 to the upper layer.

 The MAC layer and the RLC layer on the machine terminal side both set the split function, and the machine terminal transmits at least one RLC PDU and at least one MAC PDU in one transmission, wherein the header of the MAC PDU includes a transmission sequence number TSN for sorting, a split indication And the length indication of the MAC SDU, and the RLC PDU adopts the structure of the non-acknowledgment mode. The header of the RLC PDU includes the sequence number SN for sorting and the length of the data other than the padding bit, that is, the LCH-ID in the header of the prior art MAC PDU. The information may be omitted, and the RLC PDU does not need RLC retransmission, and the sequence number SN carried by the RLC PDU header and the number of bits of the length of the data other than the padding bit may be appropriately reduced, see the previous embodiment; The processing unit 804 may specifically include a fourth MAC processing sub-unit D8041 and a fourth RLC processing sub-unit D8042, see FIG. 9e.

 The fourth MAC processing sub-unit D8041 is configured to parse, sort, and reassemble the MAC PDU received by the receiving unit 803 according to the transmission sequence number TSN, the split indication, and the length indication of the MAC SDU, and submit the same to the upper layer.

 The fourth RLC processing sub-unit D8042 is configured to parse, sort, and concatenate the RLC PDUs received by the receiving unit 803 according to the length of the data other than the sequence number SN and the padding bits, and submit the data to the upper layer.

 Optionally, if the machine terminal encrypts the RLC PDU or the MAC PDU, the packet header of the RLC PDU or the MAC PDU may further include a random number COUNT and/or a machine terminal identifier for decryption, and at this time, the network side device A decryption unit 805 can also be included, see Figure 9f.

 The decryption unit 805 is configured to decrypt the MAC PDU or the RLC PDU according to the random number COUNT and/or the machine terminal identifier.

In addition, the header of the MAC PDU may also include the machine terminal identifier, see the previous implementation. example.

 The processing unit 804 is further configured to perform some operations such as control according to the machine terminal, such as time advance maintenance, according to the machine terminal identifier.

 Optionally, the header of the MAC PDU may also be used to indicate whether the machine terminal identifier is present, see the previous embodiment.

 The processing unit 804 is further configured to: when determining that the machine terminal identifier exists according to the indication for indicating whether the machine terminal identifier exists, read the machine terminal identifier in the MAC PDU header. Otherwise, if it is determined that the machine terminal identifier does not exist, it indicates that there is no machine terminal identifier in the MAC PDU header, and then the subsequent header information, such as the TSN, the split indication, or the length indication of the MAC SDU, can be directly read.

 For the specific implementation of the above various units, refer to the foregoing embodiments, and details are not described herein again.

 In a specific implementation, the entity of the network side device includes at least a public user plane entity, and may further include a control plane entity. For example, the grouping unit 801 and the notification unit may be specifically implemented by a control plane entity, and the receiving unit 803 and the processing unit 804 may Implemented by public user entity, and so on.

 It can be seen that the grouping unit 801 of the network side device in the embodiment of the present invention can group the machine terminals according to the preset policy, and let the machine terminals in the group share one radio bearer, so that the machine terminals in the group can only correspond to one A common RLC entity does not need to establish a corresponding PLC entity for each machine terminal, so that while saving network resources, some header information of the MAC PDU and the RLC PDU may be omitted, such as omitting information such as LCH-ID or reducing The number of bits of the information, and the like, so that the header overhead can be saved relative to the prior art, thereby reducing processing complexity and improving transmission efficiency.

 In addition, since the radio resources occupied by the communication of the machine terminal are reduced, the influence of the communication of the machine terminal on the ordinary terminal can be reduced, which is advantageous for ensuring the communication quality of the ordinary terminal. Example IX.

 Correspondingly, the embodiment of the present invention further provides a communication system, which includes any of the machine terminals and the network side device provided by the embodiments of the present invention. For details, refer to the foregoing embodiments, and details are not described herein.

In summary, the network side device in the communication system provided by the embodiment of the present invention may group the machine terminals according to the preset policy, and let the machine terminals in the group share one radio bearer. The machine terminals in the group can only correspond to one common RLC entity, and do not need to establish a corresponding PLC entity for each machine terminal, and save network resources, and can also omit some header information of the MAC PDU and the RLC PDU, for example, The information such as the LCH-ID is omitted or the number of bits of the information is reduced. Therefore, compared with the prior art, the header overhead can be saved, thereby reducing processing complexity and improving transmission efficiency.

 In addition, since the radio resources occupied by the communication of the machine terminal are reduced, the influence of the communication of the machine terminal on the ordinary terminal can be reduced, which is advantageous for ensuring the communication quality of the ordinary terminal. A person skilled in the art can understand that all or part of the steps of the foregoing embodiments can be completed by a program to instruct related hardware. The program can be stored in a computer readable storage medium. The storage medium can include: Read only memory (ROM, Read Only Memory), random access memory (RAM), disk or optical disk.

 The above detailed description of the data processing method, apparatus and system provided by the embodiments of the present invention is only for assisting in understanding the method of the present invention and its core idea; and at the same time, for those skilled in the art, according to the present invention The present invention is not limited by the scope of the present invention.

Claims

Rights request

A data processing method, comprising:

 Obtaining group information, where the group information includes a group identifier, a serial number of the machine terminal in the group, and a location of the public radio bearer configuration parameter corresponding to the group in the broadcast message;

 Determining, according to the grouping information, a public radio bearer corresponding to the group to which the machine terminal belongs;

 Generating a protocol data unit MAC PDU of the medium access control protocol layer and a protocol data unit RLC PDU of the radio link control protocol layer;

 And transmitting, by the public radio bearer, a MAC PDU and an RLC PDU to a shared user plane entity established by a group of machine terminals of the network side device carrying the transmission.

 The method according to claim 1, wherein the MAC layer and the RLC layer of the machine terminal side do not set the splitting function, and the generating the MAC PDU and the RLC PDU are specifically:

 A MAC PDU and an RLC PDU are generated in one transmission. The header of the MAC PDU includes only the length indication of the service data unit MAC SDU of the access control protocol layer, and the RLC PDU adopts a transparent mode structure.

 The method according to claim 1, wherein the MAC layer on the machine terminal side does not set the split function, and the RLC layer sets the split function, and the generated MAC PDU and the RLC PDU are:

 One transmission generates one MAC PDU and at least one RLC PDU, the header of the MAC PDU includes only the number of MAC SDUs, and the RLC PDU adopts a structure of a non-acknowledgment mode, and the header of the RLC PDU includes only the sequence number used for sorting. The length of the data outside the SN and padding bits.

 The method according to claim 1, wherein the MAC layer on the machine terminal side sets the split function, and the RLC layer does not set the split function, and the generated MAC PDU and the RLC PDU are:

 One transmission generates one RLC PDU and at least one MAC PDU, and the header of the MAC PDU includes only the transmission sequence number TSN for sorting, the split indication, and the length indication of the MAC SDU, and the RLC PDU adopts a transparent mode structure.

 The method according to claim 1, wherein the MAC layer and the RLC layer of the machine terminal side both set the splitting function, and the generating the MAC PDU and the RLC PDU are specifically:

Generating at least one MAC PDU and at least one RLC PDU in one transmission, the MAC The header of the PDU includes only the transmission sequence number TSN for sorting, the split indication, and the length indication of the MAC SDU, the RLC PDU adopts a structure of a non-acknowledgment mode, and the header of the RLC PDU includes only the sequence number SN for sorting. And the length of the data outside the padding bits.

 6. A method according to any one of claims 1 to 5, characterized in that

 If there are at least two logical channels, the header of the MAC PDU also includes a logical channel identifier.

 7. A method according to any one of claims 1 to 5, characterized in that

 The header of the MAC PDU also includes a machine terminal identifier.

 8. A method according to any one of claims 1 to 5, characterized in that

 The header of the MAC PDU further includes an indication for indicating whether the machine terminal identity is present.

The method according to any one of claims 1 to 5, further comprising: encrypting the generated MAC PDU at the MAC layer, and the header of the MAC PDU further includes a random number COUNT for decryption. Or,

 The generated RLC PDU is encrypted at the RLC layer, and the header of the RLC PDU further includes a random number COUNT and/or a machine terminal identifier for decryption.

 10. A data processing method, comprising:

 Obtaining grouping information of the machine terminal according to the preset policy, where the group information includes a group identifier, a serial number of the machine terminal in the group, and a location of the corresponding public radio bearer configuration parameter of the group in the broadcast message;

 Notifying the machine terminal of the group information;

 The protocol data unit MAC PDU of the medium access control protocol layer and the protocol data unit RLC PDU of the radio link control protocol layer sent by the receiver terminal through the public radio bearer according to the packet information.

 11. The method of claim 10, wherein

 If the MAC layer and the RLC layer on the machine terminal side do not set the split function, the machine terminal generates only one MAC PDU and one RLC PDU in one transmission, and the header of the MAC PDU includes only the service data unit MAC SDU of the access control protocol layer. The length indicates that the RLC PDU adopts a transparent mode structure;

 At this time, the method further includes:

 Parsing the MAC PDU according to the length of the MAC SDU and submitting it to the upper layer;

Submit the RLC PDU directly to the upper layer.

12. The method of claim 10, wherein

 If the MAC layer of the machine terminal side does not set the split function, and the RLC layer sets the split function, the machine terminal transmits one MAC PDU and at least one RLC PDU at a time, and the header of the MAC PDU includes only the number of MAC SDUs, The RLC PDU adopts a structure of a non-acknowledgment mode, and the header of the RLC PDU includes only the sequence number SN for sorting and the length of data other than the padding bits;

 At this time, the method further includes:

 Parsing the MAC PDU according to the number of MAC SDUs and submitting it to the upper layer;

 The RLC PDU is parsed, sorted, and concatenated according to the length of the sequence number SN and the padding bits, and submitted to the upper layer.

 13. The method of claim 10, wherein

 The MAC layer of the machine terminal side sets the split function. If the RLC layer does not set the split function, the machine terminal transmits one RLC PDU and at least one MAC PDU at a time. The header of the MAC PDU includes only the transport sequence number TSN for sorting. And a split indication and a length indication of the MAC SDU, where the RLC PDU adopts a transparent mode;

 At this time, the method further includes:

 Parsing, sorting, and concatenating the MAC PDU according to the transmission sequence number TSN, the split indication, and the length indication of the MAC SDU, and submitting to the upper layer;

 Submit the RLC PDU directly to the upper layer.

 14. The method of claim 10, wherein

 The MAC layer and the RLC layer on the machine terminal side both set the split function, and the machine terminal transmits at least one RLC PDU and at least one MAC PDU in one transmission. The header of the MAC PDU includes only the transmission sequence number TSN for sorting, splitting. Instructing and indicating the length of the MAC SDU, the RLC PDU adopts a structure of a non-acknowledgment mode, and the header of the RLC PDU includes only the sequence number SN for sorting and the length of data other than the padding bit;

 At this time, the method further includes:

 Parsing, sorting, and concatenating the MAC PDU according to the transmission sequence number TSN, the split indication, and the length indication of the MAC SDU, and submitting to the upper layer;

 The RLC PDU is parsed, sorted, and concatenated according to the length of the sequence number SN and the padding bits, and submitted to the upper layer.

The method according to any one of claims 10 to 14, wherein the MAC The header of the PDU further includes an indication for indicating whether the machine terminal identifier exists, and the method further includes:

 The machine terminal identifier in the MAC PDU header is read when the machine terminal identifier is determined to be present according to the indication for indicating whether the machine terminal identifier is present.

 The method according to any one of claims 10 to 14, wherein the header of the MAC PDU further includes a random number COUNT for decryption, and the method further includes:

 The MAC PDU is decrypted at the MAC according to the random number COUNT.

 The method according to any one of claims 10 to 14, wherein the header of the RLC PDU further comprises a random number COUNT and/or a machine terminal identifier for decryption, and the method further comprises:

 The RLC PDU is decrypted at the RLC based on the random number COUNT and/or machine terminal identification.

 18. A machine terminal, comprising:

 An obtaining unit, configured to acquire group information, where the group information includes a group identifier, a sequence number of the machine terminal in the group, and a location of the public radio bearer configuration parameter corresponding to the group in the broadcast message;

 a determining unit, configured to determine, according to the group information acquired by the acquiring unit, a public radio bearer corresponding to the group to which the machine terminal belongs;

 a generating unit, configured to generate a protocol data unit MAC PDU of a medium access control protocol layer and a protocol data unit RLC PDU of a radio link control protocol layer;

 a sending unit, configured to transmit, by the determining unit, the public radio bearer, the MAC PDU and the RLC PDU generated by the generating unit to the public user plane entity, where the public user plane entity is a network side device transmitting the public radio bearer A shared user plane entity established by the group machine terminal.

 The machine terminal according to claim 18, wherein the generating unit is specifically a first generating module, or a second generating module, or a third generating module, or a fourth generating module; When the MAC layer and the RLC layer on the machine terminal side do not set the split function, one MAC PDU and one RLC PDU are generated in one transmission, where the header of the MAC PDU includes only the service data unit MAC SDU of the access control protocol layer. The length indication, the RLC PDU adopts a transparent mode structure;

a second generation module, configured to not set a split function on the MAC layer of the machine terminal side, the RLC layer When the split function is set, one MAC PDU and at least one RLC PDU are generated in one transmission. The header of the MAC PDU includes only the number of MAC SDUs, and the RLC PDU adopts a structure of non-acknowledgment mode. The header of the RLC PDU includes only the sorting. The length of the data outside the sequence number SN and padding bits;

 a third generation module, configured to set a split function on the MAC layer of the machine terminal side, and when the RLC layer does not set the split function, generate one RLC PDU and at least one MAC PDU in one transmission, where the header of the MAC PDU is only included for The sequence of the transmitted transmission sequence number TSN, the split indication, and the length of the MAC SDU, and the RLC PDU adopts a transparent mode structure;

 And a fourth generating module, configured to generate at least one MAC PDU and at least one RLC PDU in one transmission when the MAC layer and the RLC layer of the machine terminal side respectively set the splitting function, where the header of the MAC PDU includes only the transmission for sorting The serial number TSN, the split indication, and the length indication of the MAC SDU, the RLC PDU adopts a structure of a non-acknowledgment mode, and the header of the RLC PDU includes only the sequence number SN for sorting and the length of data other than the padding bits.

 The machine terminal according to claim 18 or 19, further comprising a first force port dense unit;

 a first encryption unit, configured to encrypt the generated MAC PDU at the MAC layer;

 Then, the header of the MAC PDU generated by the generating unit further includes a random number COUNT for decryption.

 The machine terminal according to claim 18 or 19, further comprising a second force port dense unit;

 a second encryption unit, configured to encrypt the generated RLC PDU at the RLC layer;

 Then, the header of the RLC PDU generated by the generating unit further includes a random number COUNT and/or a machine terminal identifier for decryption.

 22. A network side device, comprising:

 a grouping unit, configured to obtain grouping information of the machine terminal according to the preset policy, where the grouping information includes a group identifier, a serial number of the machine terminal in the group, and a location of the corresponding public radio bearer configuration parameter of the group in the broadcast message;

a notification unit, configured to notify the machine terminal of the grouping information obtained by the grouping unit, and a receiving unit, configured by the protocol data unit MAC PDU and the medium of the medium access control protocol layer sent by the receiver terminal according to the group information by using the public radio bearer Protocol Data Unit RLC PDU of the Link Control Protocol layer.

The network side device according to claim 22, wherein if the MAC layer and the RLC layer on the machine terminal side do not set the split function, the machine terminal generates only one MAC PDU and one RLC PDU in one transmission. The packet header of the MAC PDU includes only the length indication of the service data unit MAC SDU of the access control protocol layer, and the RLC PDU adopts a transparent mode structure; then, the network side device further includes a first MAC processing subunit and the first RLC processing Subunit

 a first MAC processing subunit, configured to parse and submit the MAC PDU received by the receiving unit according to the length of the MAC SDU to the upper layer;

 The first RLC processing sub-unit is configured to directly submit the RLC PDU received by the receiving unit to the upper layer.

 24. The network side device according to claim 22, wherein

 If the MAC layer of the machine terminal side does not set the split function, and the RLC layer sets the split function, the machine terminal transmits one MAC PDU and at least one RLC PDU at a time, and the header of the MAC PDU includes only the number of MAC SDUs, The RLC PDU adopts a structure of a non-acknowledgment mode, and the packet header of the RLC PDU includes only the sequence number SN for sorting and the length of data other than the padding bit. Then, the network side device further includes a second MAC processing subunit and the second An RLC processing sub-unit, configured to parse and submit the MAC PDU received by the receiving unit to the upper layer according to the number of MAC SDUs;

 And a second RLC processing sub-unit, configured to parse, sort, and concatenate the RLC PDU received by the receiving unit according to the length of the data other than the sequence number SN and the padding bit, and submit to the upper layer.

 25. The network side device according to claim 22, wherein

 The MAC layer of the machine terminal side sets the split function. If the RLC layer does not set the split function, the machine terminal transmits one RLC PDU and at least one MAC PDU at a time. The header of the MAC PDU includes only the transport sequence number TSN for sorting. The splitting indication and the length indication of the MAC SDU, the RLC PDU adopts a transparent mode structure, and the network side device further includes a third MAC processing subunit and a third RLC processing subunit;

 a third MAC processing subunit, configured to parse, sort, and serially reassemble the MAC PDU received by the receiving unit according to the transmission sequence number TSN, the split indication, and the length indication of the MAC SDU, and submit the same to the upper layer;

The third RLC processing sub-unit is configured to directly submit the RLC PDU received by the receiving unit to the upper layer.

The network side device according to claim 22, wherein the MAC layer and the RLC layer on the machine terminal side both set the splitting function, and the machine terminal transmits at least one RLC PDU and at least one MAC PDU in one transmission, The header of the MAC PDU includes only the transmission sequence number TSN for sorting, the split indication, and the length indication of the MAC SDU, the RLC PDU adopts a structure of a non-acknowledgment mode, and the header of the RLC PDU includes only the sequence number for sorting. The length of the data other than the SN and the padding bit, the network side device further includes a fourth MAC processing subunit and a fourth RLC processing subunit;

 a fourth MAC processing subunit, configured to parse, sort, and serially reassemble the MAC PDU received by the receiving unit according to the transmission sequence number TSN, the split indication, and the length indication of the MAC SDU, and submit the same to the upper layer;

 And a fourth RLC processing sub-unit, configured to parse, sort, and recombine the RLC PDU received by the receiving unit according to the length of the data other than the sequence number SN and the padding bit, and submit to the upper layer.

 The network side device according to any one of claims 22 to 26, wherein the header of the RLC PDU or the MAC PDU further includes a random number COUNT and/or a machine terminal identifier for decryption, and the network side device further Including a decryption unit;

 a decryption unit, configured to identify a MAC according to the random number COUNT and/or machine terminal

The PDU or RLC PDU is decrypted.

 A communication system, comprising the machine terminal according to any one of claims 18 to 21 or the network side device according to any one of claims 22 to 27.