CN106470497A - A kind of data transmission method, wireless spread-spectrum technology send and receiving entity - Google Patents

Abstract

The invention provides a data transmission method, a wireless link control sending and receiving entity, and solves the problem that the reliability of reception and the lower time delay cannot be guaranteed at the same time when RLC data is transmitted. The present invention includes: acquiring the service data unit SDU information to be processed that requires enhanced reliability or reduced time delay, the SDU information to be processed includes at least one SDU original data; performing copy processing on the SDU original data in the SDU information to be processed , obtaining a copy of the SDU original data; processing the SDU original data and the copy of the SDU original data to obtain protocol data unit PDU information; sending the PDU information to an RLC receiving entity. The present invention reduces the time delay caused by retransmission while ensuring the reliable reception of RLC data by duplicating the original data of the SDU that needs to enhance the receiving reliability or reduce the time delay.

Description

A data transmission method, a wireless link control sending and receiving entity

technical field

The present invention relates to the technical field of communication applications, in particular to a data transmission method and a wireless link control sending and receiving entity.

Background technique

A Radio Link Control (RLC) entity is configured by one of 3 data transmission modes: Transparent Mode (TM), Unacknowledged Mode (UM) and Acknowledged Mode (AM).

AM RLC provides bidirectional data transmission services, and its most important feature is retransmission. Automatic repeat request is used to support error-free transmission. AM RLC is mainly used in non-real-time applications that are error-sensitive and time-delay tolerant. These applications include most interactive services, such as Web browsing and file downloading.

The TM RLC entity is transparent to the Protocol Data Unit (PDU) passing through it, that is, it does not perform any operations and does not add RLC header information, and the RLC SDU is directly mapped to the RLC PDU. Therefore, the use of TM RLC is very strict, and only RRC messages that do not require RLC configuration can be used, such as broadcast system information messages, paging messages, and RRC messages when there is no signaling radio bearer.

UM RLC is mainly used in delay-sensitive and error-tolerant real-time services, especially VoIP services and other delay-sensitive streaming media services. Point-to-multipoint services such as multimedia broadcast and multicast services also use UM RLC, because point-to-multipoint services have no suitable feedback path, and these services cannot use AM RLC.

In existing LTE systems and future systems, low latency and high reliability are two important performance indicators, but they are opposite to each other. The guarantee of reliability will inevitably lead to higher latency, and the requirement of low latency often cannot guarantee the reliable reception of data. For the AM mode, the reliability of data transmission can be achieved through automatic repeat request ARQ retransmission, but the RLC retransmission process will bring a large time delay; for the TM/UM mode, although it can guarantee a low Delay, but because there is no feedback path and other reasons, the reliable reception of data cannot be guaranteed.

Contents of the invention

The purpose of the present invention is to provide a data transmission method and a radio link control sending and receiving entity, which are used to solve the problem that the reliability of receiving RLC data and the lower time delay cannot be guaranteed at the same time during transmission.

In order to achieve the above object, the present invention provides a data transmission method, which is applied to a radio link control RLC sending entity, including:

Acquiring the service data unit SDU information to be processed that needs to enhance reliability or reduce delay, and the SDU information to be processed includes at least one SDU original data;

Copying the original SDU data in the SDU information to be processed to obtain a copy of the original SDU data;

Processing the SDU original data and the copy of the SDU original data to obtain protocol data unit PDU information;

Send the PDU information to the RLC receiving entity.

Wherein, the step of processing the SDU original data and the copy of the SDU original data to obtain the protocol data unit PDU information includes:

Segmenting and concatenating the SDU original data and the copy of the SDU original data to obtain a plurality of PDUs to be sent;

According to the positional relationship between the SDU original data and the SDU original data, an RLC header message is added to the PDU to be sent to obtain the PDU information.

Wherein, according to the positional relationship between the SDU original data and the copy of the SDU original data, adding an RLC header message in the PDU to be sent, and obtaining the PDU information includes:

If the SDU original data is adjacent to the copy of the SDU original data, adding a first RLC header message to the first PDU to be sent where the copy of the SDU original data is located, to obtain the PDU information;

Wherein, the first RLC header message includes: first identification information used to identify the copy of the SDU original data and second identification information used to identify the length of each SDU data segment in the first PDU to be sent .

Wherein, according to the positional relationship between the SDU original data and the copy of the SDU original data, adding an RLC header message in the PDU to be sent, and obtaining the PDU information includes:

If the SDU original data is not adjacent to the copy of the SDU original data, then add a second RLC header message to the first PDU to be sent where the copy of the SDU original data is located, to obtain the PDU information;

Wherein, the second RLC header message includes: first identification information used to identify the copy of the SDU original data, second identification information used to identify the length of each SDU data segment in the first PDU to be sent and the third identification information used to identify the location of the SDU original data, the third identification information includes the first location information of the second PDU to be sent where the SDU original data is located and the SDU original data in Second location information of the location in the second PDU to be sent.

The present invention also provides a data transmission method, which is applied to a radio link control RLC receiving entity, and the method includes:

Obtain the PDU information sent by the RLC sending entity;

When the PDU information includes both the SDU original data and the copy of the SDU original data, performing deduplication processing on the PDU information to obtain deduplicated PDU information;

Reassemble the deduplicated PDU information and send it to the upper layer.

Wherein, when the SDU original data and the copy of the SDU original data are included in the PDU information, the step of deduplicating the PDU information to obtain the deduplication PDU information includes:

Detecting whether there are SDU original data and a copy of the SDU original data in the PDU information;

If they exist at the same time, any one of the SDU original data and the copy of the SDU original data is discarded to obtain deduplicated PDU information.

Wherein, the PDU information includes a plurality of PDUs and an RLC header message corresponding to each PDU, and each of the PDUs includes at least one SDU data segment.

Wherein, the step of detecting whether there are SDU original data and a copy of the SDU original data in the PDU information includes:

If the RLC header message corresponding to the PDU includes first identification information for identifying a copy of the original SDU data, then detecting whether the PDU and the previous PDU adjacent to the PDU include a copy of the original SDU data Corresponding SDU raw data;

If the RLC header message corresponding to the PDU includes first identification information for identifying a copy of the original SDU data and third identification information for identifying the location of the original SDU data corresponding to the copy of the original SDU data, then Detecting whether the PDU identified by the third identification information contains the SDU original data corresponding to the copy of the SDU original data, where the third identification information includes the second PDU to be sent where the SDU original data is located The first position information and the second position information of the position of the SDU original data in the second PDU to be sent.

Wherein, the step of recombining the deduplicated PDU information and sending it to the upper layer includes:

removing the RLC header message in each of the PDUs to obtain a PDU to be combined;

According to the second identification information used to identify the length of each SDU data segment in the RLC header message of the PDU to be combined, the SDU data segments in the PDU to be combined are reassembled and sent to the upper layer.

Among them, the above method also includes:

If the PDU information includes any one of the original SDU data and the copy of the original SDU data, the RLC retransmission operation or HARQ retransmission operation is not triggered.

The present invention also provides a radio link control sending entity, including:

The first obtaining module is used to obtain the service data unit SDU information to be processed that needs to enhance reliability or reduce delay, and the SDU information to be processed includes at least one SDU original data;

A first processing module, configured to copy the original SDU data in the SDU information to be processed, to obtain a copy of the original SDU data;

A reassembly module, configured to process the original SDU data and a copy of the original SDU data to obtain protocol data unit PDU information;

A sending module, configured to send the PDU information to an RLC receiving entity.

Wherein, the recombination module includes:

A reassembly unit, configured to segment and concatenate the SDU original data and the copy of the SDU original data to obtain a plurality of PDUs to be sent;

The adding unit is configured to add an RLC header message to the PDU to be sent according to the positional relationship between the SDU original data and the SDU original data, so as to obtain the PDU information.

Wherein, the adding unit includes:

The first adding subunit is used to add a first RLC header message to the first PDU to be sent where the copy of the SDU original data is located if the SDU original data is adjacent to the copy of the SDU original data, to obtain The PDU information;

Wherein, the first RLC header message includes: first identification information used to identify the copy of the SDU original data and second identification information used to identify the length of each SDU data segment in the first PDU to be sent .

Wherein, the adding unit includes:

The second adding subunit is used to add a second RLC header message to the first PDU to be sent where the copy of the SDU original data is located if the original SDU data is not adjacent to the copy of the SDU original data, Obtain the PDU information;

Wherein, the second RLC header message includes: first identification information used to identify the copy of the SDU original data, second identification information used to identify the length of each SDU data segment in the first PDU to be sent and the third identification information used to identify the location of the SDU original data, the third identification information includes the first location information of the second PDU to be sent where the SDU original data is located and the SDU original data in Second location information of the location in the second PDU to be sent.

The present invention also provides a radio link control receiving entity, including:

The second obtaining module is used to obtain the PDU information sent by the RLC sending entity;

The second processing module is configured to perform deduplication processing on the PDU information when the PDU information includes both SDU original data and a copy of the SDU original data, to obtain deduplicated PDU information;

The third processing module is used to reassemble the deduplicated PDU information and send it to the upper layer.

Wherein, the second processing module includes:

A detection unit, configured to detect whether the original SDU data and a copy of the original SDU data exist in the PDU information at the same time;

Deduplication unit, used to discard any one of the SDU original data and the copy of the SDU original data if the SDU original data and the copy of the SDU original data exist in the PDU information at the same time, and obtain the deduplicated PDU information.

Wherein, the PDU information includes a plurality of PDUs and an RLC header message corresponding to each PDU, and each of the PDUs includes at least one SDU data segment.

Wherein, the detection unit includes:

The first detection subunit is used to detect whether the PDU and the previous PDU adjacent to the PDU include the first identification information used to identify the copy of the original data of the SDU in the RLC header message corresponding to the PDU. Including the SDU original data corresponding to the copy of the SDU original data;

The second detection subunit is used to if the RLC header message corresponding to the PDU includes the first identification information used to identify the copy of the SDU original data and the location of the SDU original data corresponding to the copy of the SDU original data The third identification information of the location, then detect whether the PDU identified by the third identification information contains the SDU original data corresponding to the copy of the SDU original data, wherein the third identification information includes the SDU original data The first position information of the second PDU to be sent at , and the second position information of the position of the SDU original data in the second PDU to be sent.

Wherein, the third processing module includes:

A removing unit, configured to remove the RLC header message in each of the PDUs, to obtain the PDU to be combined;

The processing unit is configured to reassemble the SDU data segments in the PDU to be combined and send them to the upper layer according to the second identification information used to identify the length of each SDU data segment in the RLC header message of the PDU to be combined.

Wherein, the above radio link control receiving entity also includes:

The fourth processing module is configured to not trigger an RLC retransmission operation or a HARQ retransmission operation if the PDU information includes any one of the original SDU data and the copy of the original SDU data.

Embodiments of the present invention have the following beneficial effects:

In the data transmission method of the embodiment of the present invention, the SDU information of the service data unit to be processed needs to be enhanced or the delay is reduced; the SDU original data in the SDU information to be processed is copied, and the SDU original data is obtained. Copy: process the SDU original data and the copy of the SDU original data to obtain the protocol data unit PDU information and send it to the RLC receiving entity. The present invention reduces the time delay caused by retransmission while ensuring the reliable reception of RLC data by duplicating the original data of the SDU that needs to enhance the receiving reliability or reduce the time delay.

Description of drawings

Fig. 1 is the first work flowchart of the data transmission method of the embodiment of the present invention;

Fig. 2 is the second working flowchart of the data transmission method of the embodiment of the present invention;

Fig. 3 is the first schematic structural diagram of SDU original data and SDU position in the embodiment of the present invention;

Fig. 4 is the second structural schematic diagram of SDU original data and SDU position in the embodiment of the present invention;

5 is a third workflow diagram of the data transmission method according to the embodiment of the present invention;

6 is a schematic diagram of processing received PDU information by an RLC receiving end in an embodiment of the present invention;

FIG. 7 is a fourth working flowchart of the data transmission method according to the embodiment of the present invention;

FIG. 8 is a fifth workflow diagram of the data transmission method according to the embodiment of the present invention;

FIG. 9 is a schematic diagram of the operation of the data transmission method in the TM mode according to the embodiment of the present invention;

FIG. 10 is a schematic diagram of the operation of the data transmission method in the UM mode according to the embodiment of the present invention;

FIG. 11 is a working schematic diagram of a data transmission method in an AM mode according to an embodiment of the present invention;

12 is a schematic structural diagram of an RLC header in a data transmission method according to an embodiment of the present invention;

13 is a schematic diagram of a first interaction between an RLC sending end and an RLC receiving end according to an embodiment of the present invention;

FIG. 14 is a schematic diagram of a second interaction between an RLC sending end and an RLC receiving end according to an embodiment of the present invention.

detailed description

In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, the following will describe in detail with reference to specific embodiments and accompanying drawings.

Embodiments of the present invention provide a data transmission method and a radio link control sending and receiving entity, which solves the problem that the reliability of receiving RLC data and low time delay cannot be guaranteed at the same time during transmission.

First embodiment:

As shown in Figure 1, the data transmission method includes:

Step 11: Obtain the SDU information to be processed that needs to enhance reliability or reduce delay, and the SDU information to be processed includes at least one SDU original data;

Step 12: Copying the original SDU data in the SDU information to be processed to obtain a copy of the original SDU data;

Step 13: Processing the SDU original data and the copy of the SDU original data to obtain protocol data unit PDU information;

Step 14: Send the PDU information to the RLC receiving entity.

In the data transmission method of the embodiment of the present invention, the SDU information of the service data unit to be processed needs to be enhanced or the delay is reduced; the SDU original data in the SDU information to be processed is copied, and the SDU original data is obtained. Copy: process the SDU original data and the copy of the SDU original data to obtain the protocol data unit PDU information and send it to the RLC receiving entity. The present invention reduces the time delay caused by retransmission while ensuring the reliable reception of RLC data by duplicating the original data of the SDU that needs to enhance the receiving reliability or reduce the time delay.

Second embodiment:

As shown in Figure 2, the data transmission method includes:

Step 11: Obtain the SDU information to be processed that needs to enhance reliability or reduce delay, and the SDU information to be processed includes at least one SDU original data;

Step 12: Copying the original SDU data in the SDU information to be processed to obtain a copy of the original SDU data;

Step 131: Segmenting and concatenating the original SDU data and the copy of the SDU original data to obtain multiple PDUs to be sent;

Step 132: According to the positional relationship between the SDU original data and the SDU original data, add an RLC header message in the PDU to be sent to obtain the PDU information;

Step 14: Send the PDU information to the RLC receiving entity.

In this embodiment, the positional relationship between the SDU original data and the SDU original data can be adjacent or non-adjacent, as shown in Figure 3, RLC SDU n is a delay-sensitive SDU that needs enhanced reliability Original data, after it is copied, RLC SDU n+1 is the copy of RLC SDU n, and Fig. 3 shows the situation that RLC SDU n+1 of RLC SDU n copy RLC SDU n+1 is close to original data RLC SDU n; As shown in Fig. 4, The copy can also be located not adjacent to the original RLC SDU n, where RLC SDU n+2 is a copy of RLC SDU n.

Further, the step 131 includes:

If the SDU original data is adjacent to the copy of the SDU original data, adding a first RLC header message to the first PDU to be sent where the copy of the SDU original data is located, to obtain the PDU information;

Wherein, the first RLC header message includes: first identification information used to identify the copy of the SDU original data and second identification information used to identify the length of each SDU data segment in the first PDU to be sent .

Further, the step 131 also includes:

If the SDU original data is not adjacent to the copy of the SDU original data, then add a second RLC header message to the first PDU to be sent where the copy of the SDU original data is located, to obtain the PDU information;

Wherein, the second RLC header message includes: first identification information used to identify the copy of the SDU original data, second identification information used to identify the length of each SDU data segment in the first PDU to be sent and the third identification information used to identify the location of the SDU original data, the third identification information includes the first location information of the second PDU to be sent where the SDU original data is located and the SDU original data in Second location information of the location in the second PDU to be sent.

In the RLC header message of the embodiment in the present invention, also include: fields such as I, E, SN, LI, wherein:

FI: 2 bits, used to indicate whether the first data segment and the last data segment of the PDU data part are SDU or SDU segment;

E: 1 bit, used to indicate whether the subsequent part is a header structure or data;

SN: PDU serial number, 5 bits or 10 bits;

LI: 11 bits, indicating the length of each SDU or SDU segment.

In a specific embodiment of the present invention, if the copy of the RLC SDU is not adjacent to the original RLC SDU, a field needs to be added to the header of the RLC PDU where the copy of the RLC SDU is located to indicate the original RLC SDU corresponding to the copy of the RLC SDU The location of the RLC PDU. Furthermore, in the prior art, the last segment does not need LI indication. However, the embodiment of the present invention needs to indicate the LI (segment length) of each segment in the RLC header, that is, on the basis of the prior art, it is necessary to add the LI indication of the last segment. For the LI corresponding to the RLC SDU copy, special processing is required to inform the RLC receiving entity that the RLC SDU is a copy rather than the original RLC SDU data. Optionally, the LI corresponding to the duplicate RLC SDU is set to all 1/0 or other specific values.

Third embodiment:

As shown in Figure 5, the data transmission method includes:

Step 21: Obtain the PDU information sent by the RLC sending entity;

Step 22: When the PDU information contains both the SDU original data and the copy of the SDU original data, perform deduplication processing on the PDU information to obtain deduplicated PDU information;

Step 23: Reassemble the deduplicated PDU information and send it to the upper layer.

Further, this embodiment also includes:

If the PDU information includes any one of the original SDU data and the copy of the original SDU data, the RLC retransmission operation or HARQ retransmission operation is not triggered.

In this embodiment, as long as any RLC SDU (original RLC SDU or RLC SDU copy) is received correctly, the reception of another RLC SDU is abandoned. As shown in FIG. 6, if the copy RLC SDU n+1 is successfully received, the original RLC SDU n is abandoned.

In this embodiment, the RLC receiving entity reorders the received RLC PDUs, removes the RLCheader, discards repeatedly received RLC SDUs, and performs reassembly operations, reducing the probability of RLC retransmissions in AM mode and MAC layer HARQ retransmissions probability, thereby reducing the data processing delay. At the same time, the probability of reliable reception of TM/UM RLC PDUs is improved, ensuring the reliability of data reception.

Fourth embodiment:

As shown in Figure 7, the data transmission method includes:

Step 21: Obtain the PDU information sent by the RLC sending entity;

Step 221: Detect whether the original SDU data and a copy of the original SDU data exist in the PDU information;

Step 222: If they exist at the same time, discard any one of the SDU original data and the copy of the SDU original data, and obtain the deduplicated PDU information;

Step 23: Reassemble the deduplicated PDU information and send it to the upper layer.

In this embodiment, the PDU information includes a plurality of PDUs and an RLC header message corresponding to each PDU, and each of the PDUs includes at least one SDU data segment.

Further, the step 221 includes:

If the RLC header message corresponding to the PDU includes first identification information for identifying a copy of the original data of the SDU, then detecting whether the previous PDU adjacent to the PDU contains the SDU corresponding to the copy of the original data of the SDU Raw data;

If the RLC header message corresponding to the PDU includes first identification information for identifying a copy of the original SDU data and third identification information for identifying the location of the original SDU data corresponding to the copy of the original SDU data, then Detecting whether the PDU identified by the third identification information contains the SDU original data corresponding to the copy of the SDU original data, wherein the third identification information includes the first position information of the PDU where the SDU original data is located and second position information of the position of the original SDU data in the first PDU to be sent.

Fifth embodiment:

As shown in Figure 8, the data transmission method includes:

Step 21: Obtain the PDU information sent by the RLC sending entity;

Step 22: When the PDU information contains both the SDU original data and the copy of the SDU original data, perform deduplication processing on the PDU information to obtain deduplicated PDU information;

Step 231: removing the RLC header message in each PDU to obtain the PDU to be combined;

Step 232: According to the second identification information used to identify the length of each SDU data segment in the RLC header message of the PDU to be combined, reassemble the SDU data segments in the PDU to be combined and send them to the upper layer.

Since the radio link control (RLC) entity is configured by one of 3 data transmission modes: Transparent Mode (TM), Unacknowledged Mode (UM) and Acknowledged Mode (AM). The data transmission method in the embodiment of the present invention will be described in detail below in combination with three data transmission modes.

(1) For TM transmission mode

As shown in Figure 9, the RLC sending side includes:

Step 1a: The UM-RLC entity at the sending end copies the original SDU data in the SDU information to be processed for enhanced reliability or reduced delay, obtains a copy of the original SDU data, and directly generates the protocol data unit PDU information, And send the PDU information to the RLC receiving entity;

The RLC receiving side includes:

Step 2a: the RLC receiving entity acquires the PDU information sent by the RLC sending entity, and when the PDU information contains both the original SDU data and the copy of the original SDU data, discard the data repeatedly received, obtain the deduplicated PDU information, and sent to the upper layer.

(2) For UM transmission mode

As shown in Figure 10, the RLC sending side includes:

Step 1b: The UM-RLC entity at the sending end copies the SDU original data in the SDU information to be processed for reliability enhancement or delay reduction, to obtain a copy of the SDU original data;

Step 2b: Segmenting and concatenating the original data of the SDU and the copy of the original data of the SDU to obtain a plurality of PDUs to be sent;

Step 3b: Add RLC header information to each PDU to be sent, obtain PDU information, and send it to the RLC receiving entity.

The RLC receiving entity side includes:

Step 4b: The RLC receiving entity receives the PDU information sent by the RLC sending entity, and performs HARQ reordering and discards duplicate received data processing;

Step 5b: remove the RLC header message to obtain the PDU to be assembled;

Step 6b: Reassemble the SDU data segments in the PDU to be combined and send them to the upper layer.

(3) For AM transmission mode

As shown in Figure 11, the RLC sending side includes:

Step 1c: The UM-RLC entity at the sending end copies the SDU original data in the SDU information to be processed for reliability enhancement or delay reduction, to obtain a copy of the SDU original data;

Step 2c: Segmenting and concatenating the original data of the SDU and the copy of the original data of the SDU to obtain a plurality of PDUs to be sent;

Step 3c: Add RLC header information to each PDU to be sent, obtain PDU information, and send it to the RLC receiving entity.

The RLC receiving entity side includes:

Step 4c: The RLC receiving entity receives the PDU information sent by the RLC sending entity, performs HARQ reordering, discards duplicate received data processing, and instructs RLC to retransmit when both the original SDU data and the copy of the original SDU data are not received correctly;

Step 5c: remove the RLC header message to obtain the PDU to be assembled;

Step 6c: Reassemble the SDU data segments in the PDU to be combined and send them to the upper layer.

Further, the above-mentioned steps 3b and 3c both specifically include two situations, which are specifically described as follows.

Case 1: The copy of the RLC SDU is adjacent to the original data of the SDU

Figure 12 shows the RLC header structure of RLC PDU 2. RLC PDU 2 consists of RLC SDU 1 fragments, RLC SDU 2 and RLC SDU 3 fragments. LI1 indicates the length of the RLC SDU 1 segment and LI3 indicates the length of the RLC SDU 3 segment. RLC SDU 2 is a copy of RLC SDU 1, so the LI corresponding to RLC SDU 2 is set to all 1s to notify the RLC receiving entity that RLC SDU 2 is a copy of RLC SDU 1, and the length of RLC SDU 2 and RLC SDU 1 is the same.

As shown in Figure 13, in the process of data transmission, RLC PDU 1 may not be received normally due to reasons such as poor wireless environment, resulting in RLC SDU 1 being unable to receive. However, RLC PDU 2 is received normally, and RLC PDU 2 contains a copy of RLC SDU 1, that is, RLC SDU 2, so there is no need to trigger subsequent HARQ retransmission and RLC retransmission operations of RLC PDU 1. Since the occurrence of retransmission is avoided, the delay is greatly reduced. Thus, low latency and high reliability performance of data transmission is guaranteed.

Case 2: The copy of the RLC SDU is not adjacent to the original data of the SDU

When the copy of the RLC SDU is not adjacent to the original RLC SDU, an additional field needs to be added when adding the RLC PDU header, which is used to indicate the position of the original SDU, that is, which data segment of which RLC PDU it is in. As shown in Figure 14, RLC SDU 3 is a copy of RLC SDU 1, and RLC SDU3 is a part of RLC PDU 3. When adding the RLC PDU 3 header, it is necessary to indicate in the header the location of the original data of the duplicate RLC SDU 3 (that is, the RLC SDU 1), that is, the RLC SDU 1 is in the second data segment of the RLC PDU 1.

During data transmission, RLC PDU 1 may not be received normally due to reasons such as poor wireless environment, resulting in RLC SDU 1 being unable to receive. However, RLC PDU 3 may be received normally, and RLC PDU 3 contains a copy of RLC SDU 1, that is, RLC SDU 3, so there is no need to trigger HARQ retransmission and RLC retransmission of RLC PDU 1. Since the occurrence of retransmission is avoided, the delay is greatly reduced. Thus, low latency and high reliability performance of data transmission is guaranteed.

Sixth embodiment:

The embodiment of the present invention also provides a radio link control sending entity, including:

The first obtaining module is used to obtain the service data unit SDU information to be processed that needs to enhance reliability or reduce delay, and the SDU information to be processed includes at least one SDU original data;

A first processing module, configured to copy the original SDU data in the SDU information to be processed, to obtain a copy of the original SDU data;

A reassembly module, configured to process the original SDU data and a copy of the original SDU data to obtain protocol data unit PDU information;

A sending module, configured to send the PDU information to an RLC receiving entity.

Further, the recombination module includes:

A reassembly unit, configured to segment and concatenate the SDU original data and the copy of the SDU original data to obtain a plurality of PDUs to be sent;

The adding unit is configured to add an RLC header message to the PDU to be sent according to the positional relationship between the SDU original data and the SDU original data, so as to obtain the PDU information.

Further, the adding unit includes:

The first adding subunit is used to add a first RLC header message to the first PDU to be sent where the copy of the SDU original data is located if the SDU original data is adjacent to the copy of the SDU original data, to obtain The PDU information;

Wherein, the first RLC header message includes: first identification information used to identify the copy of the SDU original data and second identification information used to identify the length of each SDU data segment in the first PDU to be sent .

Further, the adding unit includes:

The second adding subunit is used to add a second RLC header message to the first PDU to be sent where the copy of the SDU original data is located if the original SDU data is not adjacent to the copy of the SDU original data, Obtain the PDU information;

Wherein, the second RLC header message includes: first identification information used to identify the copy of the SDU original data, second identification information used to identify the length of each SDU data segment in the first PDU to be sent and the third identification information used to identify the location of the SDU original data, the third identification information includes the first location information of the second PDU to be sent where the SDU original data is located and the SDU original data in Second location information of the location in the second PDU to be sent.

Seventh embodiment:

Embodiments of the present invention also provide a radio link control receiving entity, including:

The second obtaining module is used to obtain the PDU information sent by the RLC sending entity;

The second processing module is configured to perform deduplication processing on the PDU information when the PDU information includes both SDU original data and a copy of the SDU original data, to obtain deduplicated PDU information;

The third processing module is used to reassemble the deduplicated PDU information and send it to the upper layer.

Further, the second processing module includes:

A detection unit, configured to detect whether the original SDU data and a copy of the original SDU data exist in the PDU information at the same time;

Deduplication unit, used to discard any one of the SDU original data and the copy of the SDU original data if the SDU original data and the copy of the SDU original data exist in the PDU information at the same time, and obtain the deduplicated PDU information.

Further, the PDU information includes a plurality of PDUs and an RLC header message corresponding to each PDU, and each of the PDUs includes at least one SDU data segment.

Further, the detection unit includes:

The first detection subunit is used to detect whether the PDU and the previous PDU adjacent to the PDU include the first identification information used to identify the copy of the original data of the SDU in the RLC header message corresponding to the PDU. Including the SDU original data corresponding to the copy of the SDU original data;

The second detection subunit is used to if the RLC header message corresponding to the PDU includes the first identification information used to identify the copy of the SDU original data and the location of the SDU original data corresponding to the copy of the SDU original data The third identification information of the location, then detect whether the PDU identified by the third identification information contains the SDU original data corresponding to the copy of the SDU original data, wherein the third identification information includes the SDU original data The first position information of the second PDU to be sent at , and the second position information of the position of the SDU original data in the second PDU to be sent.

Further, the third processing module includes:

A removing unit, configured to remove the RLC header message in each of the PDUs, to obtain the PDU to be combined;

The processing unit is configured to reassemble the SDU data segments in the PDU to be combined and send them to the upper layer according to the second identification information used to identify the length of each SDU data segment in the RLC header message of the PDU to be combined.

Further, the above RLC receiving entity further includes:

The fourth processing module is configured to not trigger an RLC retransmission operation or a HARQ retransmission operation if the PDU information includes any one of the original SDU data and the copy of the original SDU data.

It should be noted that the radio link control sending and receiving entity is the sending and receiving entity corresponding to the above method embodiment, and all the implementation methods in the above method embodiment are applicable to the embodiment of the sending and receiving entity, and can also achieve the same technical effect.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of the present invention. within the scope of protection.

Claims (20)

1. a kind of data transmission method, be applied to wireless spread-spectrum technology RLC sending entity it is characterised in that Methods described includes：

Obtain the pending service data unit SDU information needing to strengthen reliability or reduce time delay, described treat Process SDU information and include at least one SDU initial data；

Replication processes are carried out to the SDU initial data in described pending SDU information, obtains described SDU The copy of initial data；

The copy of described SDU initial data and described SDU initial data is processed, obtains agreement number According to unit PDU information；

Described PDU information is sent to RLC receiving entity.

2. data transmission method according to claim 1 it is characterised in that described to described SDU The copy of initial data and described SDU initial data is processed, and obtains protocol Data Unit PDU information Step include：

The copy of SDU initial data and described SDU initial data is carried out segmentation and cascade is processed, obtain Multiple PDU to be sent；

According to the position relationship between described SDU initial data and this SDU initial data, described pending Send increase RLC header messages in PDU, obtain described PDU information.

3. data transmission method according to claim 2 it is characterised in that described according to described SDU Position relationship between the copy of initial data and this SDU initial data, increases in described PDU to be sent Plus RLC header messages, the step obtaining described PDU information includes：

If described SDU initial data is adjacent with the copy of this SDU initial data, original in described SDU Add RLC header messages in residing for the copy of data first PDU to be sent, obtain described PDU Information；

Wherein, described RLC header messages include：For identifying the copy of described SDU initial data The first identification information and for identifying each SDU data slot length in the described first PDU to be sent The second identification information.

4. data transmission method according to claim 2 it is characterised in that described according to described SDU Position relationship between the copy of initial data and this SDU initial data, increases in described PDU to be sent Plus RLC header messages, the step obtaining described PDU information includes：

If described SDU initial data is non-conterminous with the copy of this SDU initial data, former in described SDU Add the 2nd RLC header messages in residing for the copy of beginning data first PDU to be sent, obtain described PDU Information；

Wherein, described 2nd RLC header messages include：For identifying the copy of described SDU initial data The first identification information, for identifying each SDU data slot length in the described first PDU to be sent The second identification information and for identifying the 3rd identification information of described SDU initial data present position, described 3rd identification information includes the primary importance information of the second PDU to be sent residing for described SDU initial data And the second position information of described SDU initial data present position in the described second PDU to be sent.

5. a kind of data transmission method, be applied to wireless spread-spectrum technology RLC receiving entity it is characterised in that Methods described includes：

Obtain the PDU information that RLC sending entity sends；

Described PDU information comprises simultaneously SDU initial data and this SDU initial data copy when, Duplicate removal process is carried out to described PDU information, obtains the PDU information after duplicate removal；

Restructuring process is carried out to the PDU information after duplicate removal, and is sent to upper strata.

6. data transmission method according to claim 5 it is characterised in that described in described PDU Comprise in information simultaneously SDU initial data and this SDU initial data copy when, to described PDU information Carry out duplicate removal process, the step obtaining the PDU information after duplicate removal includes：

Detect in described PDU information, whether there is SDU initial data and the pair of this SDU initial data simultaneously This；

If exist simultaneously, abandon appointing in described SDU initial data and the copy of this SDU initial data Meaning one, obtains the PDU information after duplicate removal.

7. data transmission method according to claim 6 is it is characterised in that described PDU packet Include multiple PDU and RLC header messages corresponding with each PDU, and each described PDU is included at least One SDU data slot.

8. data transmission method according to claim 7 is it is characterised in that the described PDU of described detection The step that whether simultaneously there is the copy of SDU initial data and this SDU initial data in information includes：

If the corresponding RLC header messages of described PDU include the copy for identifying SDU initial data First identification information, then detect in a described PDU and upper PDU adjacent with this PDU whether comprise institute State the copy corresponding SDU initial data of SDU initial data；

If the corresponding RLC header messages of described PDU include the copy for identifying SDU initial data First identification information and for identifying residing for the copy corresponding SDU initial data of described SDU initial data Whether the 3rd identification information of position, then detect described in comprising in the PDU that described 3rd identification information is identified The copy corresponding SDU initial data of SDU initial data, wherein, described 3rd identification information includes described The primary importance information of the residing for SDU initial data second PDU to be sent and described SDU initial data exist The second position information of present position in described second PDU to be sent.

9. data transmission method according to claim 7 it is characterised in that described to the PDU after duplicate removal Information carries out restructuring process, and is sent to the step on upper strata and includes：

Remove the RLC header messages in each described PDU, obtain PDU to be combined；

It is used in RLC header messages according to described PDU to be combined identifying each SDU data slot length The second identification information, restructuring is carried out to the SDU data slot in described PDU to be combined and processes and send To upper strata.

10. data transmission method according to claim 5 is it is characterised in that methods described also includes：

If comprising any in SDU initial data and the copy of this SDU initial data in described PDU information One, then do not trigger RLC retransmission operation or hybrid automatic repeat-request HARQ retransmission operation.

A kind of 11. wireless spread-spectrum technology sending entities are it is characterised in that include：

First acquisition module, for obtaining the pending service data list needing to strengthen reliability or reduce time delay First SDU information, described pending SDU information includes at least one SDU initial data；

First processing module, for replicating to the SDU initial data in described pending SDU information Process, obtain the copy of described SDU initial data；

Recombination module, at the copy to described SDU initial data and described SDU initial data Reason, obtains protocol Data Unit PDU information；

Sending module, for being sent to RLC receiving entity by described PDU information.

12. wireless spread-spectrum technology sending entities according to claim 11 are it is characterised in that described heavy Group module includes：

Recomposition unit, for by the copy of SDU initial data and described SDU initial data carry out segmentation and Cascade is processed, and obtains multiple PDU to be sent；

Adding device, for closing according to the position between described SDU initial data and this SDU initial data System, increases RLC header messages in described PDU to be sent, obtains described PDU information.

13. wireless spread-spectrum technology sending entities according to claim 12 are it is characterised in that described add Plus unit includes：

First interpolation subelement, if the copy phase for described SDU initial data and this SDU initial data Neighbour, then add a RLC report in the first PDU to be sent residing in the copy of described SDU initial data Head message, obtains described PDU information；

Wherein, described RLC header messages include：For identifying the copy of described SDU initial data The first identification information and for identifying each SDU data slot length in the described first PDU to be sent The second identification information.

14. wireless spread-spectrum technology sending entities according to claim 12 are it is characterised in that described add Plus unit includes：

Second interpolation subelement, if for described SDU initial data and this SDU initial data copy not Adjacent, then add the 2nd RLC in the first PDU to be sent residing in the copy of described SDU initial data Header messages, obtain described PDU information；

Wherein, described 2nd RLC header messages include：For identifying the copy of described SDU initial data The first identification information, for identifying each SDU data slot length in the described first PDU to be sent The second identification information and for identifying the 3rd identification information of described SDU initial data present position, described 3rd identification information includes the primary importance information of the second PDU to be sent residing for described SDU initial data And the second position information of described SDU initial data present position in the described second PDU to be sent.

A kind of 15. wireless spread-spectrum technology receiving entities are it is characterised in that include：

Second acquisition module, for obtaining the PDU information of RLC sending entity transmission；

Second processing module, for comprising SDU initial data and this SDU in described PDU information simultaneously During the copy of initial data, duplicate removal process is carried out to described PDU information, obtain the PDU information after duplicate removal；

3rd processing module, for carrying out restructuring process to the PDU information after duplicate removal, and is sent to upper strata.

16. wireless spread-spectrum technology receiving entities according to claim 15 are it is characterised in that described Two processing modules include：

Detector unit, for detecting whether there is SDU initial data and this SDU in described PDU information simultaneously The copy of initial data；

, if for there is SDU initial data in described PDU information and this SDU is original simultaneously in duplicate removal unit The copy of data, then abandon any one in described SDU initial data and the copy of this SDU initial data Individual, obtain the PDU information after duplicate removal.

17. wireless spread-spectrum technology receiving entities according to claim 16 are it is characterised in that described PDU Information includes multiple PDU and RLC header messages corresponding with each PDU, and each described PDU bag Include at least one SDU data slot.

18. wireless spread-spectrum technology receiving entities according to claim 17 are it is characterised in that described inspection Survey unit to include：

First detection sub-unit, if include for identifying for described PDU corresponding RLC header messages First identification information of the copy of SDU initial data, then detect described PDU and adjacent with this PDU upper The copy corresponding SDU initial data of described SDU initial data whether is comprised in one PDU；

Second detection sub-unit, if include for identifying for described PDU corresponding RLC header messages First identification information of the copy of SDU initial data and the copy correspondence for identifying described SDU initial data SDU initial data present position the 3rd identification information, then detect what described 3rd identification information was identified The copy corresponding SDU initial data of described SDU initial data whether is comprised in PDU, wherein, described 3rd identification information includes the primary importance information of the second PDU to be sent residing for described SDU initial data And the second position information of described SDU initial data present position in the described second PDU to be sent.

19. wireless spread-spectrum technology receiving entities according to claim 17 are it is characterised in that described Three processing modules include：

Removal unit, for removing the RLC header messages in each described PDU, obtains PDU to be combined；

Processing unit, is used for identifying each SDU in the RLC header messages according to described PDU to be combined Second identification information of data slot length, carries out weight to the SDU data slot in described PDU to be combined Group processes and is sent to upper strata.

20. wireless spread-spectrum technology receiving entities according to claim 15 are it is characterised in that also include：

Fourth processing module, if for comprising SDU initial data in described PDU information and this SDU is original Any one in the copy of data, then do not trigger RLC retransmission operation or hybrid automatic repeat-request HARQ Retransmission operation.