CN110267348B - Data transmission method and equipment - Google Patents
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Abstract
The embodiment of the invention discloses a data transmission method and equipment, relates to the technical field of communication, can flexibly select backup resource proportion according to different service requirements, and improves the resource utilization efficiency on the premise of ensuring the reliability of data transmission. The method comprises the following steps: acquiring the number N of wireless links established by a sending end and a receiving end and the reliability requirement level alpha of a service; determining coding efficiency beta according to the reliability requirement level alpha; determining the number N of service data packets transmitted simultaneously according to the number N of wireless links and the coding efficiency beta; n is less than or equal to N, and the service data packet is used for executing the service; determining a coding matrix A according to the number N of wireless links, the coding efficiency beta and the number N of simultaneously transmitted service data packets; and calculating and generating wireless link configuration information according to the coding matrix A, and carrying out data transmission on the n service data packets and the m redundant data packets according to the wireless link configuration information. The embodiment of the invention is applied to a network system.
Description
Technical Field
The embodiment of the invention relates to the technical field of communication, in particular to a data transmission method and data transmission equipment.
Background
The 3Gpp communication protocol R10 version introduces Carrier Aggregation (CA) technology, which enables multiple carriers to be used simultaneously for data transmission between a base station and a user terminal, thereby increasing transmission bandwidth and improving network system capacity and user traffic rate. R12 and subsequent releases (including LTE and 5GNR), Dual Connectivity (DC) technology was introduced. Through the dual-connection technology, a plurality of base stations simultaneously establish wireless transmission links with a user terminal, and non-ideal backhaul (Xn) interfaces (such as an X2 interface for LTE) can be used among the base stations to realize distribution and aggregation of user data, thereby more fully utilizing wireless network resources.
In the process of research on the evolution of 4G to 5G networks, the industry has proposed a service requirement for highly Reliable and low latency communications (URLLC). The service requirement has high requirements on network delay and reliability, and in a Protocol of 3GPP R15 version, a duplication method is proposed, that is, the same Protocol Data Unit (PDU) is transmitted through multiple paths on a Packet Data Convergence Protocol (PDCP) layer, and the reliability of the service is ensured by using a multi-path duplication master/slave mechanism.
The replication is supported under both CA and DC technologies. The duplicate is configured and activated by Radio Resource Control (RRC), and when a Radio Bearer (RB) is configured, the base station and the ue each add a Radio Link Control (RLC) entity and an auxiliary logical channel to process the repeated PDCP PDUs. The action of "repeating" is in the PDCP layer, so the PDCP layer needs to send the same PDCP PDU to the primary and secondary RLC entities of both transmission links. When the duplicate is active, the system ensures that two identical PDCP PDUs are sent over different carriers. For two identical PDCP PDUs, the transmitting end can ensure the validity of data transmission and improve the reliability of wireless transmission as long as it receives an Acknowledgement Character (ACK) from the receiving end to feed back any one PDU. However, the existing duplicate technology uses different carriers to transmit the same data, one master and one backup, and the resource utilization efficiency is low (1:1 protection, 50% resource utilization efficiency); in addition, the resource utilization efficiency of the duplicate technology is fixed, and fine control cannot be performed according to different service requirements.
Disclosure of Invention
Embodiments of the present invention provide a data transmission method and device, which can flexibly select a backup resource ratio according to different service requirements, and improve resource utilization efficiency on the premise of ensuring data transmission reliability.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, a data transmission method is provided, where the method includes: acquiring the number N of wireless links established by a sending end and a receiving end and the reliability requirement level alpha of a service; determining coding efficiency beta according to the reliability requirement level alpha; determining the number N of service data packets transmitted simultaneously according to the number N of wireless links and the coding efficiency beta; wherein N is less than or equal to N, and the service data packet is used for executing service; determining a coding matrix A according to the number N of wireless links, the coding efficiency beta and the number N of simultaneously transmitted service data packets; calculating and generating wireless link configuration information according to the coding matrix A, and carrying out data transmission on the n service data packets and the m redundant data packets according to the wireless link configuration information; the wireless link configuration information comprises N wireless links used for transmitting N service data packets simultaneously and m wireless links used for transmitting m redundant data packets in the N wireless links; the m redundant data packets are standby data packets for protecting the n service data packets; the data information contained in the m redundant data packets is generated by calculating the data information contained in the n service data packets; the N service data packets correspond to the N wireless links one by one, the m redundant data packets correspond to the m wireless links one by one, and N is N + m.
In the method, firstly, the coding efficiency beta is determined according to the acquired reliability requirement level alpha of the service to realize flexible configuration of different services and different coding efficiencies; determining the number N of data packets transmitted simultaneously according to the acquired number N of wireless links established between the transmitting end and the receiving end and the encoding efficiency beta; wherein N is less than or equal to N, and the service data packet is used for executing service; then, determining a coding matrix A according to the number N of the wireless links, the coding efficiency beta and the number N of the service data packets transmitted simultaneously; finally, calculating and generating wireless link configuration information according to the coding matrix A, and carrying out data transmission on the n service data packets and the m redundant data packets according to the wireless link configuration information; the wireless link configuration information comprises N wireless links used for transmitting N service data packets simultaneously and m wireless links used for transmitting m redundant data packets in the N wireless links; the m redundant data packets are standby data packets for protecting the n service data packets; the data information contained in the m redundant data packets is generated by calculating the data information contained in the n service data packets; n service data packets and m redundant data packets are transmitted simultaneously; the N service data packets correspond to the N wireless links one by one, the m redundant data packets correspond to the m wireless links one by one, and N is N + m. The invention flexibly selects the proportion of the backup resources according to different business requirements, changes the fixed proportion of 1:1 transmission resource protection in the prior art into m which can be flexibly selected: n transmission resource protection proportion can improve the resource utilization efficiency on the premise of ensuring the reliability of data transmission.
In a second aspect, there is provided a data transmission apparatus, comprising: the system comprises an acquisition unit, a receiving unit and a transmitting unit, wherein the acquisition unit is used for acquiring the number N of wireless links established by a transmitting end and a receiving end and the reliability requirement level alpha of a service; the processing unit is used for determining the coding efficiency beta according to the reliability requirement level alpha acquired by the acquisition unit; the processing unit is further configured to determine the number N of service data packets transmitted simultaneously according to the number N of the wireless links and the coding efficiency β acquired by the acquiring unit; wherein N is less than or equal to N, and the service data packet is used for executing service; the processing unit is further used for determining an encoding matrix A according to the number N of the wireless links, the encoding efficiency beta and the number N of the service data packets transmitted simultaneously, which are acquired by the acquisition unit; the processing unit is also used for calculating and generating wireless link configuration information according to the coding matrix A and carrying out data transmission on the n service data packets and the m redundant data packets according to the wireless link configuration information; the wireless link configuration information comprises N wireless links used for transmitting N service data packets simultaneously and m wireless links used for transmitting m redundant data packets in the N wireless links; the m redundant data packets are standby data packets for protecting the n service data packets; the data information contained in the m redundant data packets is generated by calculating the data information contained in the n service data packets; n service data packets and m redundant data packets are transmitted simultaneously; the service data packets correspond to the wireless links one by one, and the redundant data packets correspond to the wireless links one by one.
It can be understood that, the data transmission device provided above is configured to execute the method corresponding to the first aspect provided above, and therefore, the beneficial effects that can be achieved by the data transmission device may refer to the beneficial effects of the method corresponding to the first aspect above and the beneficial effects of the solutions in the following detailed description, which are not described herein again.
In a third aspect, a data transmission device is provided, the data transmission device having a structure including a processor and a memory, the memory being configured to couple to the processor and store necessary program instructions and data of the data transmission device, and the processor being configured to execute the program instructions stored in the memory so that the data transmission device performs the method of the first aspect.
In a fourth aspect, there is provided a computer storage medium having computer program code stored therein, which when run on a data transmission apparatus causes the data transmission apparatus to perform the method of the first aspect described above.
In a fifth aspect, there is provided a computer program product having stored thereon the above computer software instructions, which, when run on a data transmission apparatus, cause the data transmission apparatus to execute a program as in the above aspect of the first aspect.
Drawings
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
Fig. 1 is a schematic structural diagram of a network data transmission path in DC technology provided in the prior art;
fig. 2 is a schematic structural diagram of an EN-DC network system provided by the prior art;
fig. 3 is a schematic structural diagram of a data transmission system according to an embodiment of the present invention;
fig. 4 is a schematic flowchart of a data transmission method according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of an RLC PDU according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a data transmission device according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of another data transmission device according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of another data transmission device according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that, in the embodiments of the present invention, words such as "exemplary" or "for example" are used to indicate examples, illustrations or explanations. Any embodiment or design described as "exemplary" or "e.g.," an embodiment of the present invention is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, use of the word "exemplary" or "such as" is intended to present concepts related in a concrete fashion.
It should be noted that, in the embodiments of the present invention, "of", "corresponding" and "corresponding" may be sometimes used in combination, and it should be noted that, when the difference is not emphasized, the intended meaning is consistent.
For the convenience of clearly describing the technical solutions of the embodiments of the present invention, in the embodiments of the present invention, the words "first", "second", and the like are used for distinguishing the same items or similar items with basically the same functions and actions, and those skilled in the art can understand that the words "first", "second", and the like are not limited in number or execution order.
Dual connectivity is an important technology introduced by the 3GPP release. The LTE macro and small stations may implement carrier aggregation by using a dual connection technology, and the LTE macro and small stations may use an existing non-ideal backhaul (non-ideal backhaul) X2 interface, thereby providing a higher rate to users and improving spectral efficiency and load balancing by using macro/micro networking. The terminal supporting dual connectivity can be connected with two LTE base stations simultaneously, so that the throughput of a single user is increased.
In the deployment process of the 5G network, the 5G cell can be used as a macro coverage independent network, and can also be used as a small station to perform coverage and capacity enhancement on the existing LTE network. No matter which networking mode is adopted, the dual connection technology can be used for realizing the interconnection of the LTE system and the 5G system, so that the wireless resource utilization rate of the whole mobile network system is improved, the time delay of system switching is reduced, and the performance of a user and the system is improved. Based on the LTE dual connectivity technology, the 3GPP defines the dual connectivity technology of LTE and 5G. The LTE/5G dual connection is a key technology for realizing LTE and 5G fusion networking and flexible deployment scene by an operator. The rapid deployment can be realized based on the existing LTE core network in the early 5G period, and the comprehensive network coverage can be realized by the combined networking of the LTE and the 5G in the later period, so that the wireless resource utilization rate of the whole network system is improved, the system switching time delay is reduced, and the user performance and the system performance are improved.
In the LTE/5G dual connectivity mode, the user plane data flow is as shown in FIG. 1. The uplink user plane data is always transmitted through a master evolved node B (MeNB). The LTE eNB as the MeNB establishes a separate bearer for downlink user plane data routing and forwarding, and the downlink user plane data routing and forwarding are completed by the PDCP layer. The PDCP layer under the split bearer can decide whether to send the downlink PDCP PDU to the local RLC layer or forward the downlink PDCP PDU to the 5G SgNB through the Xx interface. The data routing and forwarding of the PDCP layer under the split bearer mainly implement two functions: firstly, time delay estimation and data transmission path selection; second, flow control. The aim is to make the PDUs transmitted through different paths experience the same time delay as much as possible, thereby reducing the packet reordering of the PDCP layer at the terminal side to improve the TCP performance.
Referring to fig. 2, a schematic structure diagram of an EN-DC network system provided in the prior art is shown. Wherein, EN is an improved universal terrestrial radio access new radio (i.e. 4G radio access network), and is called evolved universal terrestrial radio access new radio in english. EN-DC refers to dual connectivity of a 4G radio access network with a 5G NR (new radio). The EN-DC network system of fig. 2 includes an Evolved Packet Core (EPC) layer and an evolved Universal Mobile Telecommunications System (UMTS) terrestrial radio access network (E-UTRAN) layer. The EPC layer includes a Mobility Management Entity (MME)/serving gateway (S-GW). The E-UTRAN layer includes 5G base stations en-gNB and 4G base stations eNB. Wherein the en-gbb provides NR user plane and control plane protocols and functions for 5G network users. The eNB provides NR user plane and control plane protocols and functions for 4G network users. The interface between the en-gNB and the en-gNB is an X2-U interface, the interface between the en-gNB and the eNB is an X2 interface, and the interface between the eNB and the eNB is an X2 interface. The interface between the en-gNB and the MME/S-GW is an S1-U interface, and the interface between the eNB and the MME/S-GW is an S1 interface.
A method and an apparatus for processing a radio bearer repeat transmission disclosed in the prior art, the method comprising: a sending end determines the receiving condition of a bottom layer data packet; and activating or deactivating the repeated transmission of the packet data aggregation protocol data unit according to the receiving condition. By adopting the method, the sending end autonomously activates or deactivates the repeated transmission of the grouped data aggregation protocol data unit through the receiving condition feedback of the bottom layer data packet. Due to the adoption of the mode of informing the packet data convergence protocol layer through the bottom layer in the sending end, the repeated transmission and the deactivation of the repeated transmission can be quickly and efficiently realized, the high reliability brought by the repeated transmission is obtained, the use efficiency of wireless resources can be improved, and the resource waste is avoided. This method is also an optimization method for the 3gpp standard replication. However, since the duplicate technology uses different carriers to transmit the same data, the resource utilization efficiency is low (1:1 protection, 50% resource utilization efficiency); in addition, the resource utilization efficiency of the duplicate technology is fixed, and fine control cannot be performed according to different service requirements.
Based on the above background and the problems in the prior art, referring to fig. 3, following the definition of 3Gpp, the main base station is menb (master evolved node B), and the secondary base stations (SeNB) are named SeNB1, SeNB2, and SeNB3 … … according to the connection establishment sequence, and the wireless links under each base station are marked as { CC1, CC2, and CC3 … … } according to Carriers (Component Carriers). It should be noted that the present invention emphasizes that network coding is adopted to improve transmission reliability under multilink transmission, so that hereinafter, the wireless links refer to different CCs). And the MeNB activates, deactivates and modifies the coding scheme through the signaling flow. The specific signaling flow can follow the prior art scheme. The invention adds a coding control module in a base station, a terminal and a service gateway SGW (serving gateway way), wherein the coding control module is used for realizing the parameters required by the configuration coding and generating a coding matrix. Wherein, the base station and the service gateway transmit data and signaling through Sx interface. Data and signaling are transferred between base stations through an Xn interface. In addition, the main control coding module in the base station bears different RB bearing separation positions according to Master Cell Group (MCG), Secondary Cell Group (SCG) or split space group (SCG), and the coding control module of the base station bearing the separation positions is responsible for coding control.
It should be noted that the present invention is applicable to both uplink and downlink data transmission, and therefore, the following description of data transmission is only labeled as a transmitting end and a receiving end; the base station in the downlink direction is the sending end, the terminal is the receiving end, and the uplink direction is not the reverse direction.
Referring to fig. 4, an embodiment of the present invention provides a data transmission method, where the method includes:
401. and acquiring the number N of wireless links established by the sending end and the receiving end and the reliability requirement level alpha of the service.
For example, the transmission reliability requirement level α of the QoS required by the RB may be obtained from a User Equipment (UE) Context (Context) stored on the base station side.
Illustratively, the service reliability requirement level α may be customized by the operator according to the requirements of the service on real-time performance and reliability, for example, the service reliability requirement level α may be set as shown in table 1.
TABLE 1
| Type of service | Business paradigm | Reliability rating |
| High traffic service | Download traffic, HTTP traffic, and the like | 1 |
| Low latency services | Online gaming, real-time video, etc | 2 |
| Highly reliable delay insensitive service | Mail service, Piggyback, etc | 3 |
| Low-delay high-reliability service | Remote control and Internet of vehicles controlSystem etc. of | 4 |
| reserved | reserved | reserved |
| reserved | reserved | reserved |
402. And determining the coding efficiency beta according to the reliability requirement level alpha.
Optionally, the coding mode selection is to map the service reliability requirement level α into the coding efficiency β through a function f1(α), so as to implement flexible configuration of different services and different coding efficiencies. The coding efficiency beta corresponding to the service reliability requirement level alpha can be obtained by inquiring the mapping relation table according to the service reliability requirement level alpha. Illustratively, table 2 below is a mapping relationship table of the service reliability requirement level α and the coding efficiency β, the coding efficiency β generation algorithm is defined as a function f1(α), and the coding efficiency β is generated by using a predefined coding method (e.g., a linear network coding method) according to the input service reliability requirement level α.
TABLE 2
| | β | |
| 1 | 1 | |
| 2 | (N-1)/N | |
| 3 | (N-1)/ |
|
| 4 | 1/N |
403. Determining the number N of service data packets transmitted simultaneously according to the number N of wireless links and the coding efficiency beta; wherein N is less than or equal to N, and the service data packet is used for executing service.
Optionally, the number N of the wireless links and the coding efficiency β are calculated according to a formula N ═ β N, so as to generate the number N of the service data packets transmitted simultaneously.
In one implementation, the radio link protection mode provides reliability protection for how many radio link resources (i.e., m simultaneously transmitted redundant data packets and m radio links) are logically allocated for n traffic data packets that need to be transmitted simultaneously, for example. When the number of the wireless links established between the sending end and the receiving end is N, and N is more than or equal to 2, N-1 wireless link protection modes can be selected. For example, when N is 2, only 1 optional rlc mode is available, i.e., a primary-secondary mode. N is N + m; wherein n is the number of wireless links of service data packets for simultaneous transmission, and n is more than or equal to 1; m is the number of radio links for the redundant data packets transmitted simultaneously. The n wireless links are used for simultaneously transmitting n service data packets, and the m wireless links are used for simultaneously transmitting m redundant data packets; the n wireless links correspond to the n service data packets one by one, and the m wireless links correspond to the m redundant data packets one by one. And simultaneously transmitting the m redundant data packets and the n service data packets.
The reliability guarantee strength and the resource utilization efficiency may be adapted as follows: in the first mode, when the number N of service data packets transmitted simultaneously is 1, accurate data transmission can be ensured as long as any wireless link exists, the transmission reliability is optimal, and the resource utilization rate is at least 1/N. And in the second mode, when the number N of the service data packets transmitted simultaneously is equal to N-1, accurate data transmission can be ensured under the condition that any wireless link fails, and the resource utilization rate is the highest (N-1)/N.
404. And determining the coding matrix A according to the number N of the wireless links, the coding efficiency beta and the number N of the service data packets transmitted simultaneously.
In one implementation, step 204 includes the steps of:
4041. querying a database according to the coding efficiency beta to determine a predefined matrix; the predefined matrix is a matrix for predefining the matrix type of the coding matrix A; wherein the coding efficiency beta corresponds to the predefined matrix one to one.
Optionally, generating a predefined matrix from the encoding parameters by using a linear network encoding method; wherein the encoding parameters include at least one or more of: the number N of wireless links established by the transmitting end and the receiving end, the coding efficiency beta, the link quality, the link delay and the link level Qos requirement.
4042. And determining A according to the number N of the wireless links, the number N of the service data packets transmitted simultaneously and the predefined matrix.
Illustratively, the encoding matrix a generation algorithm is defined as a function f2(N, β, [ arg1, arg2 … ]), and the predefined matrix is generated using a linear network encoding method according to the input parameters. The number N of wireless links established between the transmitting end and the receiving end and the coding efficiency β in the function f2 are basic parameters, [ arg1, arg2 … ] may be parameters such as link quality, link delay, link-level Qos requirements, and the like, and may participate in the generation of the coding matrix as extension input parameters.
405. And calculating and generating wireless link configuration information according to the coding matrix A, and carrying out data transmission on the n service data packets and the m redundant data packets according to the wireless link configuration information.
The wireless link configuration information comprises N wireless links used for transmitting N service data packets simultaneously in the N wireless links and m wireless links used for transmitting m redundant data packets; the m redundant data packets are standby data packets for protecting the n service data packets; the data information contained in the m redundant data packets is generated by calculating the data information contained in the n service data packets; n service data packets and m redundant data packets are transmitted simultaneously; the N service data packets correspond to the N wireless links one by one, the m redundant data packets correspond to the m wireless links one by one, and N is N + m.
Optionally, the calculating and generating the radio link configuration information according to the coding matrix a specifically includes:
carrying out bit calculation on the coding matrix A according to the following formula to generate wireless link configuration information:
wherein S is i Representing service data packets, b i I is more than or equal to 1 and less than or equal to n,
the data packet transmitted by the ith wireless link is
The data packet is any one of the following items: service data packets and redundant data packets.
The coding matrix a is a matrix of (N, N), and the rank is N.
In addition, before the data transmission is performed on the n service data packets and the m redundant data packets according to the radio link configuration information, the method further includes: and adding a unity identifier to the n service data packets and the m redundant data packets.
The method considers the situation that the data loss is possible in the process of transmitting the data packet by the transmitting end and the receiving end. The invention proposes the following solutions: the sending end judges whether the data packet is successfully received according to the Radio Link Control (RLC) status report of each wireless link for transmitting the service data packet and each wireless link for transmitting the redundant data packet, which are fed back by the receiving end, the coding control module of the receiving end decodes the data packet, and original information S1 and S2 … Sn are recovered by a Gaussian elimination method for N data packets (including N service data packets and m redundant data packets) which are transmitted by N wireless links and m wireless links together. For example, the decoding operation at the base station side is performed by the coding control module of the base station in the PDCP layer, and the decoding operation at the terminal side is performed by the coding control module of the terminal in the PDCP layer.
Illustratively, for N data packets jointly transmitted by N radio links and m radio links, if x data packets have transmission errors, a PDCP layer where a coding control module of a transmitting end is located receives Radio Link Control Acknowledgement (RLCACK) characters transmitted by N-x radio links, and the requirement of unique solution is known according to a matrix equation.
1) When x is less than or equal to m, the receiving end can recover all correct data of the n service data packets through decoding, and the transmitting end can release cache on all first wireless links for transmitting the n service data packets and the m redundant data packets.
2) When x > m, the receiving end can obtain N- (x-m) correct data at most by decoding. For data that cannot be decoded and recovered, the following two methods can be adopted:
the method comprises the following steps: the transmitting end re-divides the unrecoverable data packet into a group together with the new data packet, and retransmits the data packet according to the data transmission method corresponding to fig. 4. And releasing the cache for the first wireless link corresponding to the successfully transmitted service data packet.
The method 2 comprises the following steps: the sending end (e.g., base station RLC entity) of the radio link receiving the Negative Acknowledgement Character (NACK) directly retransmits the n service data packets and the m redundant data packets. Since the receiving end fails to recover the data packets, it needs to receive a group of N data packets to decode completely, and therefore the PDCP layer needs to buffer a group of data that fails to be decoded all the time.
In addition, when a certain radio link is unavailable, the base station initiates a physical layer reconfiguration process to the terminal side, deletes the unavailable radio link, and may also add links. The process can be realized according to the existing LTE and NR network methods.
First, for better understanding, the embodiment of the present invention exemplarily illustrates the data transmission method described above. Taking an example of one terminal establishing an online game service RB, it is assumed that an MCG bearer is used, the RB establishes a dual connection with the MeNB, and establishes a CA connection with two CCs. Since the RB uses MCG bearer and bearer is separated in the MeNB, the coding control module of the MeNB serves as a master control module. Suppose that N-3 wireless connections have been established between the base station and the terminal. And the main control module reads the context loaded by the RB and stored by the base station, and obtains the service reliability requirement grade alpha which is 2. The method comprises the following specific steps:
501. acquiring the number N of wireless links established by the transmitting end and the receiving end as 3 and the reliability requirement level alpha of the service as 2.
502. And determining the coding efficiency beta as (N-1)/N according to the reliability requirement grade alpha as 2.
Note that β ═ N-1/N can be found by looking up in table 2.
503. And determining the number N of the simultaneously transmitted service data packets to be 2 according to the number N of the wireless links to be 3 and the coding efficiency beta to be (N-1)/N.
Specifically, N is 2 calculated according to the formula N β N.
504. And determining the coding matrix A according to the number N of the wireless links being 3, the coding efficiency beta being (N-1)/N and the number N of the simultaneously transmitted service data packets being 2.
Specifically, assuming that the number N of wireless links and the coding efficiency β are only included in the function f2, the predefined matrix is:
when β ═ 1:
when in use
When in use
It should be noted that, in the embodiment of the present invention, the generator matrix is adjusted without using other extended parameters, and the last link is adopted by default in β ═ N-1)/N to provide reliability protection for other links. In different applications of the network, different influencing factors can be considered, and the predefined matrix can be dynamically generated by utilizing the extended parameters.
From N-3 and N-2, the coding matrix a is a 3-row 2-column matrix, and the predefined matrix f2(N, (N-1)/N) is queried to obtain:
the rank of the coding matrix a is 2, where N is N + m, N is the number of service data packets to be transmitted simultaneously, and m is the amount of redundancy information, where N is 2 and m is 1.
405. And calculating and generating wireless link configuration information according to the coding matrix A, and carrying out data transmission on the n service data packets and the m redundant data packets according to the wireless link configuration information.
Specifically, the data transmission model is as follows:
before encoding, the RB sequentially transmits PDCP packets a, b, c, and d in the PDCP buffer, i.e., a is used for S1, b is used for S2, c is used for S3, and d is used for S4.
The available data transmission model is:
performing bit operation on the formula to obtain: b 1 ＝a，b 2 ＝b，
Then the radio link configuration is confirmedThe information is as follows: link1 transmits packet a; link2 transmits packet b; link3 transport data packet
It should be noted that, a and b are service data packets,
are redundant data packets. link1 and link2 are wireless links for transmitting traffic packets, and link3 is a wireless link for transmitting redundant packets.
Since the preset transmission matrix adopted in this embodiment has a fixed length, for data packets with different lengths, the coding control node performs packet concatenation or 0 complementing so that the lengths of the data transmitted on the links are the same.
The PDCP layer in the coding control module delivers the data packet formed after coding to the RLC entities of all CCs by adopting the existing method, and stores the PDCP PDU SN (sequence number) into the RLC PDU for a group of coding data packet RLC entities so as to distinguish which group of coding data the packet belongs to. A schematic diagram of the RLC PDU structure is shown in fig. 5. The RLC PDU structure specifically includes: D/C, RF, P, FI, E, R1, SN, PDCP SN. Wherein, SN is a sequence number indicating a sequence number of the corresponding PDU. FI is used to indicate whether one PDU is divided at the start or end position of the data field. E is an extension bit to indicate whether the data field or LI and E fields follow. R1 is a reserved field. D/C is a data/control indication that indicates whether the PDU is a data PDU or a control PDU. RF is a segment indication for indicating whether a PDU or PDU segment. P is a polling indication bit, which is used to indicate whether the transmitting end of the am rlc entity needs the peer entity to transmit the status report. The PDCP SN is a packet data convergence protocol sequence number used to determine whether a packet is lost.
Example two, in conjunction with the above example one, when a packet loss occurs, the following two cases can be distinguished:
in case one, where x is m, and m is 1, it can be known that when any 1 link data is lost in 3 links in this mode, decoding (i.e. gaussian elimination) recovery can be performed by using the remaining two links:
link1 is lost, then
Link2 is lost, then
Link3 is lost and a and b are available from Link1 and Link 2.
In case two, when x > m, the receiving end can obtain at most N- (x-m) correct data by decoding. For the data which can not be decoded and recovered, the sending end re-divides the data packet which can not be recovered and the new data packet into a group, and retransmits the data packet according to the data transmission method corresponding to the figure 4. And releasing the cache of the wireless link corresponding to the successfully transmitted service data packet.
Specifically, if more than 2 link data are lost in 3 links of the receiving end in this mode, it can be seen from that m is 1. The sending end can not receive 2 ACKs, at this time, the sending end judges whether part of data in the data packet can be analyzed through partial decoding, and the rest data which can not be analyzed and new data are grouped again and coded and retransmitted. For example, the receiving end does not receive the data packets of link2 and link3, and the matrix a indicates that link1 is the first data packet, so the receiving end can receive the data packet a. And if the Link2 and the Link3 which can not receive the ACK determine that the data to be retransmitted is only b, the transmitting end re-groups the data c to be transmitted next to b into a group and retransmits the group according to the data transmission method corresponding to the figure 4.
In the method, firstly, the coding efficiency beta is determined according to the acquired reliability requirement level alpha of the service to realize flexible configuration of different services and different coding efficiencies; determining the number N of data packets transmitted simultaneously according to the acquired number N of wireless links established between the transmitting end and the receiving end and the encoding efficiency beta; wherein N is less than or equal to N, and the service data packet is used for executing service; then, determining a coding matrix A according to the number N of the wireless links, the coding efficiency beta and the number N of the service data packets transmitted simultaneously; finally, calculating and generating wireless link configuration information according to the coding matrix A, and carrying out data transmission on the n service data packets and the m redundant data packets according to the wireless link configuration information; the wireless link configuration information comprises N wireless links used for transmitting N service data packets simultaneously and m wireless links used for transmitting m redundant data packets in the N wireless links; the m redundant data packets are standby data packets for protecting the n service data packets; the data information contained in the m redundant data packets is generated by calculating the data information contained in the n service data packets; n service data packets and m redundant data packets are transmitted simultaneously; the N service data packets correspond to the N wireless links one by one, the m redundant data packets correspond to the m wireless links one by one, and N is N + m. The invention flexibly selects the proportion of the backup resources according to different business requirements, changes the fixed proportion of 1:1 transmission resource protection in the prior art into m which can be flexibly selected: n transmission resource protection proportion can improve the resource utilization efficiency on the premise of ensuring the reliability of data transmission.
The embodiment of the present invention may perform functional module division on the data transmission device according to the method embodiment, for example, each functional module may be divided corresponding to each function, or two or more functions may be integrated in one processing module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. It should be noted that, the division of the modules in the embodiment of the present invention is schematic, and is only a logic function division, and there may be another division manner in actual implementation.
In the case of dividing each functional module by corresponding functions, fig. 6 is a schematic diagram of a possible structure of the data transmission device 60 related to the above embodiment, where the data transmission device 60 includes:
an obtaining unit 601, configured to obtain the number N of radio links established by the sending end and the receiving end and the reliability requirement level α of the service.
A processing unit 602, configured to determine the coding efficiency β according to the reliability requirement level α obtained by the obtaining unit 601.
The processing unit 602 is further configured to determine the number N of service data packets to be transmitted simultaneously according to the number N of the wireless links and the coding efficiency β acquired by the acquiring unit 601; wherein N is less than or equal to N, and the service data packet is used for executing service.
The processing unit 602 is further configured to determine the coding matrix a according to the number N of the wireless links, the coding efficiency β, and the number N of the service data packets transmitted simultaneously, which are acquired by the acquiring unit 601.
The processing unit 602 is further configured to calculate and generate radio link configuration information according to the coding matrix a, and perform data transmission on the n service data packets and the m redundant data packets according to the radio link configuration information; the wireless link configuration information comprises N wireless links used for transmitting N service data packets simultaneously and m wireless links used for transmitting m redundant data packets in the N wireless links; the m redundant data packets are standby data packets for protecting the n service data packets; the data information contained in the m redundant data packets is generated by calculating the data information contained in the n service data packets; n service data packets and m redundant data packets are transmitted simultaneously; the N service data packets correspond to the N wireless links one by one, the m redundant data packets correspond to the m wireless links one by one, and N is N + m.
In an exemplary scheme, the processing unit 602 is specifically configured to calculate, according to a formula N ═ β N, the number N of the wireless links and the coding efficiency β acquired by the acquiring unit 601, and generate the number N of the service data packets transmitted at the same time.
In an exemplary scenario, the processing unit 602 is specifically configured to query the database to determine the predefined matrix according to the coding efficiency β; the predefined matrix is a matrix for predefining the matrix type of the coding matrix A; wherein the coding efficiency beta corresponds to the predefined matrix one to one.
The processing unit 602 is further configured to determine a according to the number N of radio links, the number N of service data packets transmitted simultaneously, and the predefined matrix.
In an exemplary aspect, the processing unit 602 is specifically configured to perform a bit calculation on the coding matrix a according to the following formula to generate the radio link configuration information:
wherein S is i Representing service data packets, b i I is more than or equal to 1 and less than or equal to n,
the data packet transmitted by the ith wireless link is
The data packet is any one of the following items: service data packets and redundant data packets.
In an exemplary scheme, the processing unit 602 is further configured to add a uniformity flag to the n service data packets and the m redundancy data packets.
In an exemplary aspect, the processing unit 602 is specifically configured to generate a predefined matrix from the encoding parameters by using a linear network encoding method; wherein the encoding parameters include at least one or more of: the number N of wireless links established by the transmitting end and the receiving end, the coding efficiency beta, the link quality, the link delay and the link level Qos requirement.
Since the data transmission device in the embodiment of the present invention may be applied to implement the method embodiment, the technical effect obtained by the data transmission device may also refer to the method embodiment, and the details of the embodiment of the present invention are not repeated herein.
Fig. 7 shows a schematic diagram of a possible configuration of the data transmission device 60 according to the exemplary embodiment described above, in the case of an integrated unit. The data transmission device 60 includes: a processing module 701, a communication module 702 and a storage module 703. The processing module 701 is configured to control and manage the action of the data transmission device 60, for example, the processing module 701 is configured to support the data transmission device 60 to execute the process 402 and 405 in fig. 4. The communication module 702 is used to support communication of the data transfer device 60 with other entities. The memory module 703 is used to store program codes and data of the data transmission device 60.
The processing module 701 may be a processor or a controller, such as a Central Processing Unit (CPU), a general-purpose processor, a Digital Signal Processor (DSP), an application-specific integrated circuit (ASIC), a Field Programmable Gate Array (FPGA) or other programmable logic device, a transistor logic device, a hardware component, or any combination thereof. Which may implement or perform the various illustrative logical blocks, modules, and circuits described in connection with the disclosure. A processor may also be a combination of computing functions, e.g., comprising one or more microprocessors, a DSP and a microprocessor, or the like. The communication module 702 may be a transceiver, a transceiver circuit or a communication interface, etc. The storage module 703 may be a memory.
When the processing module 701 is a processor as shown in fig. 8, the communication module 702 is a transceiver as shown in fig. 8, and the storage module 703 is a memory as shown in fig. 8, the data transmission device 60 according to the embodiment of the present application may be the following data transmission device 60.
Referring to fig. 8, the data transmission device 60 includes: a processor 801, a transceiver 802, a memory 803, and a bus 804.
The processor 801, the transceiver 802, and the memory 803 are connected to each other by a bus 804; the bus 804 may be a Peripheral Component Interconnect (PCI) bus, an Extended Industry Standard Architecture (EISA) bus, or the like. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, only one thick line is shown, but this does not mean that there is only one bus or one type of bus.
The processor 801 may be a general-purpose Central Processing Unit (CPU), a microprocessor, an application-specific integrated circuit (ASIC), or one or more ics for controlling the execution of programs in accordance with the present disclosure.
The memory 803 may be, but is not limited to, a read-only memory (ROM) or other type of static storage device that can store static information and instructions, a Random Access Memory (RAM) or other type of dynamic storage device that can store information and instructions, an electrically erasable programmable read-only memory (EEPROM), a compact disk read-only memory (CD-ROM) or other optical disk storage, optical disk storage (including compact disk, laser disk, optical disk, digital versatile disk, blu-ray disk, etc.), magnetic disk storage media or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer. The memory may be self-contained and coupled to the processor via a bus. The memory may also be integrated with the processor.
The memory 803 is used for storing application program codes for executing the scheme of the application, and the processor 801 controls the execution. The transceiver 802 is used for receiving content input by an external device, and the processor 801 is used for executing application program codes stored in the memory 803, thereby implementing the data transmission method in the embodiment of the present application.
It should be understood that, in the various embodiments of the present application, the sequence numbers of the above-mentioned processes do not mean the execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described apparatuses, devices and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus, and method may be implemented in other ways. For example, the above-described embodiments of the apparatus are merely illustrative, and for example, a division of a unit is merely a logical division, and an actual implementation may have another division, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
Units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.
In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When implemented using a software program, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. The procedures or functions according to the embodiments of the present application are all or partially generated when the computer program instructions are loaded and executed on a computer. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored on a computer readable storage medium or transmitted from one computer readable storage medium to another computer readable storage medium, for example, the computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wire (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). Computer-readable storage media can be any available media that can be accessed by a computer or can comprise one or more data storage devices, such as servers, data centers, and the like, that can be integrated with the media. The usable medium may be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., Solid State Disk (SSD)), among others.
The embodiment of the present invention further provides a computer program product, which can be directly loaded into the memory and contains software codes, and the computer program product can be loaded and executed by a computer to implement the data transmission method.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (15)
1. A method of data transmission, comprising:
acquiring the number N of wireless links established by a sending end and a receiving end and the reliability requirement level alpha of a service;
determining coding efficiency beta according to the reliability requirement level alpha;
determining the number N of service data packets transmitted simultaneously according to the number N of the wireless links and the coding efficiency beta; wherein N is less than or equal to N, and the service data packet is used for executing the service;
determining a coding matrix A according to the number N of the wireless links, the coding efficiency beta and the number N of the service data packets transmitted simultaneously;
calculating and generating wireless link configuration information according to the coding matrix A, and carrying out data transmission on n service data packets and m redundant data packets according to the wireless link configuration information; the radio link configuration information comprises N radio links used for simultaneously transmitting the N service data packets and m radio links used for transmitting the m redundant data packets in the N radio links; the m redundant data packets are standby data packets used for protecting the n service data packets; the data information contained in the m redundant data packets is generated by calculating the data information contained in the n service data packets; the n service data packets and the m redundant data packets are transmitted simultaneously; the N service data packets correspond to the N wireless links one to one, the m redundant data packets correspond to the m wireless links one to one, and N is N + m.
2. The data transmission method according to claim 1, wherein the determining the number N of service data packets to be transmitted simultaneously according to the number N of the wireless links and the coding efficiency β specifically includes:
and calculating the number N of the wireless links and the coding efficiency beta according to a formula N ═ beta N to generate the number N of the simultaneously transmitted service data packets.
3. The data transmission method according to claim 1, wherein the determining a coding matrix a according to the number N of the wireless links, the coding efficiency β, and the number N of the service data packets transmitted simultaneously comprises:
querying a database according to the coding efficiency beta to determine a predefined matrix; wherein the predefined matrix is a matrix which predefines a matrix type of the encoding matrix A; wherein the coding efficiency β corresponds to the predefined matrix one to one;
and determining the A according to the number N of the wireless links, the number N of the simultaneously transmitted service data packets and a predefined matrix.
4. The data transmission method according to claim 1, wherein the calculating and generating radio link configuration information according to the coding matrix a specifically includes:
carrying out bit calculation on the coding matrix A according to the following formula to generate wireless link configuration information:
wherein S is i Representing service data packets, b i I is more than or equal to 1 and less than or equal to n,
the data packet transmitted by the ith wireless link is
The data packet is any one of the following items: the service data packet and the redundancy data packet.
5. The data transmission method according to claim 1, wherein before the data transmission of the n service data packets and the m redundant data packets according to the radio link configuration information, the method further comprises: and adding a uniformity identifier to the n service data packets and the m redundant data packets.
6. The data transmission method according to claim 3, comprising:
generating the predefined matrix by using a linear network coding method for the coding parameters; wherein the encoding parameters include at least one or more of: the number N of wireless links established by the sending end and the receiving end, the coding efficiency beta, the link quality, the link delay and the link level Qos requirement.
7. A data transmission device, comprising:
the system comprises an acquisition unit, a receiving unit and a transmitting unit, wherein the acquisition unit is used for acquiring the number N of wireless links established by a transmitting end and a receiving end and the reliability requirement level alpha of a service;
the processing unit is used for determining the coding efficiency beta according to the reliability requirement level alpha acquired by the acquisition unit;
the processing unit is further configured to determine the number N of service data packets to be transmitted simultaneously according to the number N of the wireless links and the coding efficiency β acquired by the acquiring unit; wherein N is less than or equal to N, and the service data packet is used for executing the service;
the processing unit is further configured to determine an encoding matrix a according to the number N of the wireless links, the encoding efficiency β, and the number N of the service data packets transmitted simultaneously, which are acquired by the acquiring unit;
the processing unit is further configured to calculate and generate radio link configuration information according to the coding matrix a, and perform data transmission on the n service data packets and the m redundant data packets according to the radio link configuration information; the radio link configuration information includes N radio links for transmitting the N service data packets simultaneously among the N radio links and m radio links for transmitting the m redundant data packets; the m redundant data packets are standby data packets for protecting the n service data packets; the data information contained in the m redundant data packets is generated by calculating the data information contained in the n service data packets; the n service data packets and the m redundant data packets are transmitted simultaneously; the N service data packets correspond to the N wireless links one to one, the m redundant data packets correspond to the m wireless links one to one, and N is N + m.
8. The data transmission apparatus according to claim 7, characterized by comprising:
the processing unit is specifically configured to calculate the number N of the wireless links and the coding efficiency β obtained by the obtaining unit according to a formula N ═ β N, and generate the number N of the service data packets transmitted simultaneously.
9. The data transmission apparatus according to claim 7, characterized by comprising:
the processing unit is specifically configured to query a database to determine a predefined matrix according to the coding efficiency β; wherein the predefined matrix is a matrix which predefines a matrix type of the encoding matrix A; wherein the coding efficiency β corresponds to the predefined matrix one to one;
the processing unit is further configured to determine a according to the number N of the wireless links, the number N of the service data packets transmitted simultaneously, and a predefined matrix.
10. The data transmission apparatus according to claim 7, characterized by comprising:
the processing unit is specifically configured to perform bit calculation on the coding matrix a according to the following formula to generate radio link configuration information:
wherein S is i Representing service data packets, b i I is more than or equal to 1 and less than or equal to n,
the data packet transmitted by the ith wireless link is
The data packet is any one of the following items: the service data packet and the redundancy data packet.
11. The data transmission device according to claim 7, characterized by further comprising:
the processing unit is further configured to add a uniformity identifier to the n service data packets and the m redundant data packets.
12. The data transmission apparatus according to claim 9, characterized by comprising:
the processing unit is specifically configured to generate the predefined matrix from the encoding parameters by using a linear network encoding method; wherein the encoding parameters include at least one or more of: the number N of wireless links established by the sending end and the receiving end, the coding efficiency beta, the link quality, the link delay and the link level Qos requirement.
13. A data transfer device having a structure comprising a processor and a memory, the memory being configured to couple to the processor to store program instructions and data necessary for the data transfer device, the processor being configured to execute the program instructions stored in the memory to cause the data transfer device to perform the data transfer method of any one of claims 1 to 6.
14. A computer storage medium, characterized in that the computer storage medium has stored therein computer program code which, when run on a data transmission device, causes the data transmission device to execute the data transmission method according to any one of claims 1-6.
15. A computer program product having computer software instructions stored thereon for causing a data transmission apparatus to perform a data transmission method as claimed in any one of claims 1 to 6 when the computer software instructions are run on the data transmission apparatus.
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| CN113162734B (en) * | 2021-03-11 | 2022-10-21 | 上海旋思智能科技有限公司 | Data redundancy acquisition communication system and communication method thereof |
| CN115209473A (en) * | 2021-04-13 | 2022-10-18 | 华为技术有限公司 | Communication method and device |
| CN113645662B (en) * | 2021-08-17 | 2023-08-18 | 中国联合网络通信集团有限公司 | Service processing method and device |
| CN114745751B (en) * | 2022-04-15 | 2023-11-21 | 中国电信股份有限公司 | Data transmission method and device, electronic equipment and storage medium |
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