WO2009033371A1

WO2009033371A1 - System and apparatus for filling protocol data unit (pdu) and the processing method thereof

Info

Publication number: WO2009033371A1
Application number: PCT/CN2008/001601
Authority: WO
Inventors: Jiamin Liu; Haizhou Bi
Original assignee: Datang Mobile Communications Equipment Co., Ltd.
Priority date: 2007-09-12
Filing date: 2008-09-10
Publication date: 2009-03-19
Also published as: CN101388900A; CN101388900B

Abstract

Method for processing the PDU padding is disclosed by the invention, and it includes: the wireless link control RLC layer receiving the RLC SDU transmitted by the network layer, generating RLC PDU by segmenting, concatenating and adding corresponding RLC header structure to the received RLC SDU, furthermore padding in the RLC header structure with bits, the number of which is the difference between the RLC header structure and the integer bytes, when the size of RLC header is not integer bytes. Apparatus of transmitting end, apparatus of receiving end and the corresponding system for implementing the PDU padding process are also disclosed bythe invention. The overhead of RLC header structure can be reduced and the effective throughput of the system can be increased sufficiently by applying the method, apparatus and system of the invention.

Description

Processing method, device and system for protocol data unit filling

The present invention relates to the field of mobile communication technologies, and in particular, to a protocol data unit (PDU) processing technology, and in particular, to a processing method, device and system for filling a PDU. Background technique

The 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) technology is the largest new technology development project initiated by 3GPP in the past two years. In LTE, the research on PDU is a very important aspect.

According to the LTE Layer 2 protocol, after the RLC (Service Data Unit) of the Radio Link Control (RLC) arrives at the RLC layer, it needs to be assigned to the corresponding RLC according to the scheduling policy. The data block size of the entity is grouped, and RLC PDUs of a specified size are generated by operations such as segmentation and cascading.

For a clearer explanation, the following is a description of the composition of the RLC PDU and the Medium Access Control (MAC) PDU.

FIG. 1 is a structural structure of an RLC PDU in the prior art. For convenience of description, the indication field in the header structure unrelated to the PDU structure is omitted. As shown in FIG. 1 , in the RLC header structure, SN ( Sequence Number ) is a sequence number; SI ( Segmentation Info ) is used to indicate whether the first and last SDUs in the PDU are segmented or complete; LI ( Length Indicator + E (Extension bit) combination is used to indicate the size of each RLC SDU or RLC SDU segment, E indicates whether the immediately following content is LI+E or data, and the last RLC SDU or RLC SDU segment LI+E Combinations can be omitted. Where LI is in bytes, that is, the RLC SDU or RLC SDU segments in the RLC PDU are all integer bytes.

After the RLC PDU is assembled, it is sent to the MAC layer. The MAC layer performs the necessary cascading of the RLC PDUs from different logical channels as MAC SDUs to form the final MAC PDU to be sent to the physical layer.

2 is a structural structure of a MAC PDU in the prior art. As shown in FIG. 2, the LCID (Logical Channel Identity) in the MAC header structure is a logical channel number; the E bit is used to indicate whether the following content is data or L (Length) A combination of +E. In the MAC SDU header structure, used to indicate each The L field at the end of the MAC SDU is also in bytes, that is, the MAC SDU also needs to be the entire byte size.

According to the structural characteristics of the LTE PDU, combined with the arrangement of the RLC PDU header structure in the R6 protocol and the convenience of the implementation of the entire byte, the following solutions are proposed in the prior art:

Each part of the RLC PDU header structure adopts a fixed size. The size occupied by the fixed part SN+SI needs to be an entire byte; the size occupied by each set of expandable parts LI+E also needs to be an entire byte. For example: LI is 7bit or 15bit, and E is lbit, so that the entire RLC PDU header structure is an entire byte arrangement, plus the payload portion of the RLC PDU, and the entire RLC PDU satisfies the entire byte arrangement.

In order to meet the requirement of the total number of bytes allocated by the scheduling policy, in some cases, padding may be used in the RLC PDU to make the RLC PDU reach a certain total number of bytes, as shown in FIG. However, in practical applications, since the size of the RLC PDU can be adjusted, padding is generally not required.

After the RLC PDUs are successively cascaded as MAC SDUs at the MAC layer and added to the indication part in the corresponding header structure corresponding to each MAC SDU, if the MAC PDU still has remaining capacity, it is also necessary to add a corresponding padding, as shown in the figure. 2 is shown.

The disadvantages of the prior art are: The parts of the RLC PDU header structure in the prior art are all fixed sizes, and the sizes occupied by the fixed part SN+SI and the expandable part LI+E are all bytes, so the RLC PDU header The number of bits in the structure will be much larger than the number of bits actually needed, which will inevitably result in a certain waste of resources. When the capacity of the RLC PDU is not large, the waste of the header structure is not serious. However, as the capacity of the PDU increases sharply, the waste of the RLC PDU header structure is very serious, and sometimes it may not be calculated. Therefore, the waste of the RLC header structure has become very prominent. How to realize the convenience of the whole byte implementation and reduce the RLC header structure overhead has become an urgent problem to be solved. Summary of the invention

In view of this, the object of the present invention is to provide a processing method, system and device for filling a PDU, which can reduce the overhead of the RLC PDU header structure, reduce resource waste, and fully improve the effective throughput of the system.

In order to achieve the above object, the technical solution of the present invention is achieved as follows:

To achieve the above objective, the present invention provides a method for processing protocol data unit PDU padding, the method comprising: receiving, by a radio link, an RLC layer, an RLC service data sheet sent by a network layer. a SDU; segmenting, cascading the received RLC SDU, and adding a corresponding RLC header structure to generate an RLC PDU, and when the size of the RLC header structure is not an entire byte, in the RLC header The number of bits in the structure that fills the RLC header structure and is different from the entire byte.

As an embodiment of the present invention, after segmenting, cascading, and adding a corresponding RLC header structure to generate the RLC PDU, the method further includes: sending the generated RLC PDU to the media interface. Into the control MAC layer; the MAC layer groups the RLC PDU as a MAC SDU and adds a corresponding MAC header structure. When the size of the MAC header structure is not an entire byte, in the MAC header structure. Filling in the number of bits in which the MAC header structure differs from the entire byte,

The total size of the MAC transport blocks is the same.

As an embodiment of the present invention, the method further includes: when the MAC layer of the receiving end unpacks the received MAC PDU, parsing the MAC header structure to obtain the indication fields LCID, L, and E corresponding to each MAC SDU, and the last indication The number of bits of the non-full byte after the domain LCID, L, and E is discarded, and the corresponding integer fields LCID, L, and E are used as the starting point to obtain the corresponding indication fields LCID, L, and E. MAC SDU, and discards the padding of the MAC PDU.

As an embodiment of the present invention, the method further includes: when the RLC layer of the receiving end unpacks the RLC PDU, discards the number of bits of the non-integer byte after the last indication field LI and E in the RLC header structure, and the last one The next full byte of the indication fields LI and E is the starting point to obtain the corresponding RLC SDU or RLC SDU segment according to the indication fields LI and E in the RLC header structure.

In the above embodiment, the number of bits to be padded is between 1 and 7 bits.

The present invention further provides a transmitting end device for implementing a PDU filling process, which includes an RLC layer processing unit and a MAC layer processing unit, where the RLC layer processing unit is configured to perform segmentation on the RLC PDU to be sent. And a packing process of cascading and RLC header structure padding, and sending the packetized data to the MAC layer, where the RLC header structure is filled in when the size of the RLC header structure is not a whole byte The number of bits of the RLC header structure that differs from the entire byte; the MAC layer processing unit is configured to group the RLC PDU sent by the RLC layer as a MAC SDU, add a MAC header structure, and fill processing, and process the The data is sent to the physical layer, where, when the size of the MAC header structure is not a full byte, the number of bits in which the MAC header structure differs from the entire byte is filled in the MAC header structure, and the a padding in the MAC PDU payload to make The size of the MAC PDU is the same as the total size allocated to the MAC transport block.

As an embodiment of the present invention, the RLC layer processing unit further includes an RLC layer group packet module, an RLC layer padding module, and an RLC layer transceiver module, where the RLC layer group packet module is configured to divide the received RLC SDU. Segment, cascading, and adding a header structure filled by the RLC layer filling module, and then sending the packaged RLC PDU to the RLC layer transceiver module of the layer; the RLC layer filling module, used in the RLC header Filling the RLC header structure with the number of bits of the entire byte, and transmitting the filled RLC header structure to the RLC layer packet module of the layer; the RLC layer transceiver module is configured to receive the network layer The RLC SDU sent by the RLC SDU is sent to the RLC layer group packet module of the local layer, and the packetized RLC PDU is sent to the MAC layer.

As an embodiment of the present invention, the MAC layer processing unit further includes a MAC layer group packet module, a MAC layer filling module, and a MAC layer transceiver module, where the MAC layer group packet module is used to be sent by the RLC layer. The RLC PDU is grouped as a MAC SDU, and the MAC header structure is added, and the padded MAC PDU is packetized and sent to the MAC layer transceiver module of the layer. The MAC layer padding module is used in the MAC header structure. Filling the MAC header structure with the entire byte size is the same as the total size allocated to the MAC transport block; the MAC layer transceiver module is configured to receive the RLC PDU sent by the RLC layer, and send the packaged MAC PDU Give the physical layer.

The present invention also provides a receiving end device for implementing PDU filling processing, which includes a MAC layer processing unit and an RLC layer processing unit, wherein the MAC layer processing unit is configured to unpack the received MAC PDU and solve the MAC address. SDU, and the padding in the MAC header structure and the padding in the MAC PDU payload are discarded, and the solved MAC SDU is sent to the RLC layer; the RLC layer processing unit is configured to send the MAC sent by the MAC layer. The SDU is unpacked as an RLC PDU, and the number of bits filled in the RLC header structure is discarded, and the RLC SDU or RLC SDU segment is obtained, and the unpacked RLC SDU is sent to the network layer, or the unpacked RLC SDU is divided. The segments are assembled into RLC SDUs and sent to the network layer.

As an embodiment of the present invention, the MAC layer processing unit further includes a MAC layer unpacking module and a MAC layer transceiver module, where the MAC layer unpacking module is configured to unpack the received MAC PDU and solve the solution. The MAC SDU is sent out by the internal MAC layer de-filling module to discard the padding in the MAC header structure and the padding in the MAC PDU payload, and sends the de-populated MAC SDU to the MAC layer transceiver module of the layer. The MAC layer transceiver module is configured to receive a MAC The PDU data is sent to the MAC layer unpacking module of the layer, and the MAC SDU sent by the MAC layer unpacking module of the layer is sent to the RLC layer.

As an embodiment of the present invention, the RLC layer processing unit further includes an RLC layer unpacking module and an RLC layer transceiver module, where the RLC layer unpacking module is configured to solve the received MAC SDU as an RLC PDU. The packet obtains the corresponding RLC SDU or RLC SDU segment, and the internal RLC layer de-filling module removes the number of bits filled in the RLC header structure, and sends the obtained RLC SDU to the RLC layer transceiver module of the layer. Or, the obtained RLC SDU segment is assembled into the RLC layer transceiver module sent by the RLC SDU to the layer; the RLC layer transceiver module is configured to receive the MAC SDU sent by the MAC layer, and receive the received MAC SDU. The RLC layer unpacking module sent to the layer, and sends the unpacked or assembled RLC SDU to the network layer.

The present invention also provides a system for implementing PDU filling processing, including a transmitting end device and at least one receiving end device, where the transmitting end device is configured to: when the packet is sent to the MAC PDU, if the size of the MAC header structure is not An integer byte, the number of bits in the MAC header structure that differs from the entire byte is filled in the MAC header structure, and padding in the MAC PDU payload is filled to allocate the size of the MAC PDU to The total size of the MAC transport blocks is the same; the receiving end is configured to receive a MAC PDU sent by the sending end device, parse the MAC header structure to obtain a corresponding indication domain, and set the number of bits filled in the MAC header structure. Discard, and obtain the corresponding MAC SDU according to the indication field in the MAC header structure starting from the next integer byte of the last indication fields LCID, L, and E.

As an embodiment of the present invention, the RLC PDU is obtained by the sender device to group the RLC SDU sent by the network layer, and the sender device performs the RLC header structure when the RLC SDU is grouped. If the size is not an integer byte, the number of bits in which the RLC header structure differs from the entire byte is filled in the RLC header structure.

As an embodiment of the present invention, the receiving end device is further configured to perform further unpacking using the obtained MAC SDU as an RLC PDU, where the receiving end device discards the number of bits filled in the RLC header structure. The corresponding RLC SDU or RLC SDU segment is obtained according to the indication fields LI and E in the RLC header structure starting from the next integer byte of the last indication fields LI and E.

The present invention also provides a terminal comprising the above-described transmitting device and the above receiving device. The present invention also proposes a base station comprising the above-mentioned transmitting end device and the above-mentioned receiving end device. The present invention also proposes an RLC PDU structure, indicating fields LI and E in the RLC header structure At least one of the bytes is a non-full byte, and the RLC header structure further has a padding item such that the size of the RLC header structure is an entire byte, and the size of the padding item is between 1 and 7 bits.

As an embodiment of the present invention, there is no indication in the RLC PDU for a padding item in the RLC header structure.

The present invention also provides a MAC PDU structure, at least one of the indication fields LCID, L, and E in the MAC header structure is a non-integer byte, and the MAC header structure further has a padding item to enable the MAC The size of the header structure is an entire byte, and the size of the padding item is between 1 and 7 bits.

As an embodiment of the present invention, there is no indication information in the MAC PDU for the padding in the MAC header structure.

As an embodiment of the present invention, a padding item is further included in a payload of the MAC PDU, and a padding item in the payload is used to allocate a size of the MAC PDU to a total size of the MAC transport block. the same.

The PDU filling processing method, device and system provided by the present invention set each domain in the RLC PDU header structure according to the required size, and the number of bits difference between the sum of the header structure size and the number of rounded up bytes is filled. Make up, and fill without special instructions. Moreover, in the MAC SDU group packet, the MAC header structure plus the total size of all MAC SDUs is different from the total size allocated to the MAC transport block, whether or not the entire byte is padded, and the padding does not require an indication. In this way, the RLC PDU header structure does not need to meet the entire byte requirement, effectively reduces the overhead of the RLC PDU header structure, avoids resource waste, and substantially improves the effective throughput of the system; and does not need to consider the header structure for the MAC SDU. Bytes, so the operation is single and convenient.

When unpacking at the MAC receiving end, each group of MAC SDUs is only solved according to the L+E indication, and the content that is not indicated at the end can be completely discarded as a padding item; likewise, at the RLC receiving end. When unpacking, you only need to solve each RLC SDU or RLC SDU segment in turn. For the last RLC SDU or RLC SDU segment, you only need to divide the largest integer byte size into SDU or SDU segments. The extra non-integer bit number is directly discarded as a padding. Thus, the operation is simple and convenient, and no complexity is introduced when processing at the receiving end. DRAWINGS

1 is a schematic structural diagram of a structure of an RLC PDU in the prior art; 2 is a schematic structural diagram of a structure of a MAC PDU in the prior art;

3 is a flowchart of processing of a transmitting end according to an embodiment of the present invention;

4 is a flowchart of processing at a receiving end according to an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a structure of a transmitting end device according to an embodiment of the present invention; FIG.

6 is a schematic structural diagram of a structure of a receiving end device according to an embodiment of the present invention;

FIG. 7 is a structural diagram of an RLC PDU according to an embodiment of the present invention; FIG.

FIG. 8 is a structural diagram of a MAC PDU according to an embodiment of the present invention; FIG.

FIG. 9 is a schematic structural view of an embodiment of the present invention. detailed description

The main idea of the present invention is: At the transmitting end, padding is used to compensate for the number of bits in which the RLC PDU header structure differs from the entire byte, so that the RLC PDU header structure is an entire byte, thereby achieving the requirement that the entire RLC PDU meets the entire byte size. Moreover, in the MAC layer processing, the MAC layer header structure plus the total size of all MAC SDUs and the number of bits that are different from the total size allocated to the MAC transport block are also padded, so that the MAC PDU header structure is an entire byte. At the same time, the filling portion is subjected to corresponding discard processing at the receiving end. The foregoing is only a preferred embodiment of the present invention. Of course, the number of bits of the RLC PDU header structure and the entire byte may be added to the padding of the RLC PDU, so that at least the entire RLC PDU can satisfy the requirement of the entire byte.

The preferred solution of the present invention also adds the above-mentioned phase difference number to the RLC PDU header structure, which not only enables the RLC PDU header structure to satisfy the entire byte requirement, but also enables the entire RLC PDU to satisfy the entire byte requirement. Therefore, the above preferred embodiment will be described in detail below.

Based on the above idea, the processing flow of the transmitting end in the present invention is as shown in FIG. 3, and includes the following steps: Step 301: The RLC layer packages the PDU to be sent.

Here, the foregoing packaging includes: performing SDU segmentation, cascading, adding an RLC header structure, and a padding operation. Generally, the RLC layer performs segmentation, cascading, and the like on the SDUs sent by the network layer according to the transport block size allocated to the RLC entity according to the scheduling policy. At the same time, the RLC layer determines the size of each part of the RLC header structure according to specific needs to form an RLC header structure. At this time, if the size of the RLC header structure does not satisfy the entire byte requirement, the RLC header structure is supplemented by padding, and the specific padding bit number may be any value from 1 to 7 bits, and the padding does not require any special indication. For example, if based on SDU or SDU The size of the segment determines that the RLC header structure is 30 bits. In order to satisfy the requirement that the RLC header structure is a full byte, the RLC header structure needs to be filled with 2 bits. Of course, if the size of the RLC header structure is just an integer number of bytes, there is no need to fill the RLC header structure.

Step 302: Send the packaged RLC PDU to the MAC layer.

Step 303: After receiving the RLC PDU, the MAC layer completes the grouping of the layer, adds the MAC header structure, and fills the MAC header structure.

The MAC layer groups the RLC PDU as a MAC SDU according to the size of the specific RLC PDU sent by each logical channel. At the same time, adding the appropriate L+E MAC header field indicates different MAC SDUs; after determining the size of the MAC header structure, it is also necessary to determine whether the size of the MAC header structure satisfies the entire byte requirement, if the entire byte is not satisfied. If required, the corresponding bit needs to be filled into the MAC header structure, and the padding does not need special indication. After the MAC header structure is filled, the total size of all MAC SDUs in the MAC header structure (padded) plus the MAC payload is compared with the total size allocated to the MAC transport block. If there is still room left, Then the MAC layer fills all the remaining bits, whether or not the entire byte is filled, into the padding in the MAC payload. Of course, if the MAC header structure is exactly the entire byte, there is no need to fill it up, and the remaining bits directly different from the total size of the MAC transmission block are filled into the padding in the MAC payload.

The processing flow of the receiving end of the present invention corresponds to the processing flow of the transmitting end, as shown in FIG. 4, which includes the following steps:

Step 401: The MAC layer of the receiving end unpacks the received MAC PDU data, and discards the padding. Here, the unpacking of the received MAC PDU data is as follows: First, the MAC header structure is parsed, and the indication field L+E corresponding to each MAC SDU is sequentially solved. Since the MAC header structure is an entire byte, the solution is solved. After all the indication fields L+E, the receiving end discards the extra bits in the header structure, that is, reads the corresponding MAC SDU according to the corresponding indication field L+E from the next full byte. At the same time, the MAC layer of the receiving end sequentially solves each MAC SDU according to the indication field L+E in the MAC header structure, and then discards the last content as a padding.

Step 402: The MAC layer sends the unpacked MAC SDU to the RLC layer.

Step 403: The RLC layer unpacks the received MAC SDU and discards the padding item.

Similarly, the RLC layer of the receiving end first parses the RLC header structure to obtain the indication field LI+E corresponding to the RLC SDU or the RLC SDU segment. Since the RLC header structure is an entire byte, all the fingers are solved. After the field L+E, the RLC layer at the receiving end discards the extra bits in the header structure, which is the bit that will be added to make the RLC an integer byte. Also, since the RLC header structure is an entire byte, the receiving end RLC layer also reads the corresponding RLC SDU or RLC SDU segment according to the parsed indication field LI+E from the next full byte of the last LI+E. .

In order to implement the above method, the present invention proposes a transmitting end device, a receiving end device and a corresponding system for implementing PDU filling processing, and the above-mentioned transmitting end device and receiving end device can be used in a base station or a terminal. Specifically, the composition of the transmitting device is as shown in FIG. 5, and the composition of the receiving device is as shown in FIG. 6.

As shown in FIG. 5, the transmitting device includes two parts, an RLC layer processing unit 51 and a MAC layer processing unit 52, where the RLC layer processing unit 51 is configured to perform segmentation, cascading, and header structure filling on the PDU to be sent. In-package processing, and the packetized data is sent to the MAC layer; the MAC layer processing unit 52 is configured to group the data sent by the RLC layer, add a MAC header structure, and fill processing, and process the processed data. Sent to the physical layer.

The RLC layer processing unit 51 is further composed of an RLC layer grouping module 511, an RLC layer filling module 512, and an RLC layer transceiver module 513. The RLC layer grouping module 511 is configured to segment and level the SDUs sent by the network layer. And adding the header structure filled by the RLC layer filling module 512, and then sending the packetized RLC PDU to the RLC layer transceiver module 513 of the layer; the RLC layer filling module 512 is configured to fill the RLC header structure in the RLC header structure. The number of bits that are different from the entire byte, and the filled RLC header structure is sent to the RLC layer packet module 511 of the layer; the RLC layer transceiver module 513 receives the SDU sent by the network layer, and sends the received SDU to the SDU. The RLC layer grouping module 511 of this layer sends the finally packaged RLC PDU to the MAC layer.

The MAC layer processing unit 52 is in turn composed of a MAC layer group packet module 521, a MAC layer padding module 522, and a MAC layer transceiver module 523. The MAC layer grouping module 521 is configured to group the RLC PDUs sent by the RLC layer, add a MAC header structure, and package the finally filled MAC PDUs to the transceiver module 523 of the layer; The module 522 is configured to fill, in the MAC header structure, the number of bits in which the MAC header structure is different from the entire byte, and the padding in the MAC payload is filled with the number of bits in which the MAC PDU is different from the total size allocated to the MAC transport block, and The MAC PDU is sent to the MAC layer group packet module 521 of the layer. The MAC layer transceiver module 523 receives the RLC PDU sent by the RLC layer, and sends the finally packaged MAC PDU to the physical layer. As shown in FIG. 6, the receiving end device includes a MAC layer processing unit 61 and an RLC layer processing unit 62. The MAC layer processing unit 61 is configured to unpack the received PDU, decode the MAC SDU, and discard the MAC address. The padding item in the payload part and the number of bits filled in the MAC header structure, and then the decoded MAC SDU is sent to the RLC layer; the RLC layer processing unit 62 is configured to unpack the MAC SDU sent by the MAC layer to obtain the RLC SDU. Or SDU segment and discard the padding in the RLC header structure, and then directly send the unpacked RLC SDU to the local network layer, or assemble the unpacked RLC SDU segment into an RLC SDU and send it to the local network layer. .

The MAC layer processing unit 61 is further composed of a MAC layer unpacking module 611 and a MAC layer transceiver module 613. The MAC layer unpacking module 611 is configured to unpack the received MAC PDU and solve the MAC SDU. The MAC layer de-filling module 612 discards the padding item in the MAC PDU payload and the part filled in the MAC header structure, and sends the parsed MAC SDU to the MAC layer transceiver module 612 of the layer. The MAC layer transceiver module 613 uses The MAC PDU data is received and the received MAC PDU is sent to the MAC layer unpacking module 611 of the local layer, and the MAC SDU sent by the MAC layer unpacking module 611 is sent to the RLC layer.

The RLC layer processing unit 62 is composed of an RLC layer unpacking module 621 and an RLC layer transceiver module 623, wherein the RLC layer unpacking module 621 is configured to unpack the received MAC SDU as an RLC PDU, and first parse the RLC header structure to obtain The indication field LI+E corresponding to the RLC SDU or the RLC SDU segment, and the RLC layer of the internal RLC layer de-filling the number of bits filled in the RLC header structure by the module 622, and then acquiring each RLC according to the parsed indication field LI+E The SDU or RLC SDU segment, because the RLC header structure is an entire byte, the RLC layer unpacking module 621 obtains each RLC SDU or RLC SDU segment starting from the entire byte after the last LI+E, and The obtained RLC SDU or RLC SDU segment is sent to the RLC layer transceiver module 623 of the local layer, or the unpacked RLC SDU segment is segmented into an RLC SDU and sent to the RLC layer transceiver module 623 of the layer; The module 623 is configured to receive the MAC SDU sent by the MAC layer, and send the received MAC SDU to the RLC layer unpacking module 621 of the local layer, and send the unpacked or assembled RLC SDU to the network layer.

In the present invention, the transmitting end device shown in Fig. 5 and the receiving end device shown in Fig. 6 together constitute a system for realizing PDU filling processing.

As shown in FIG. 7 and FIG. 8, respectively, the structure diagrams of the RLC PDU and the MAC PDU are as shown in the figure, and there is one in the RLC header structure and the MAC header structure of the RLC PDU and the MAC PDU. The entries are padded such that the size of the RLC header structure and the MAC header structure are integer bytes, so that the RLC PDU and the MAC PDU satisfy the full byte requirement.

The following takes a special value as an example to further illustrate the specific implementation of the method of the present invention:

As shown in Figure 9, the total size of the MAC transport block currently allocated to the MAC transport block is 1280 bits according to the scheduling policy. The size of the logical channel 0 allocated to the RLC is 1080 bits, and the size of the logical channel 1 allocated to the RLC is 160 bits. The respective grouping process of the RLC PDU and the MAC PDU is as follows:

If the PDU size of the RLC logical channel 0 is 1080 bits, the LI indication indicates that at least 8 bits, the E domain is the wrist, the SN domain is 10 bits, and the SI domain is 2 bits. The RLC PDU0 has a header structure of 30 bits. Filling the structure with 2 bits makes it a whole byte. As shown in the figure, filling the header structure with 2 bits enables the RLC header structure to be 32 bits, which satisfies the requirements of the entire byte. The encapsulated RLC PDU0 is 1080 bits in size, and the RLC PDU 1 is only 160 bits in size.

It is assembled at the MAC layer and added to the MAC header structure to form a MAC PDU. In the MAC header structure, the L field indicates that at least 8 bits, the E field is lbit, the LCID is 4 bits, and the MAC header structure size is 26 bits. Because the MAC header structure needs to be padded to make it a full byte, it needs to be padded with 6 bits. The padded MAC header structure plus the assembled MAC SDUO size of 1080 bits, the MAC SDUl size of 160 bits, a total of 1272 bits, relative to the size of 1280 bits allocated to the MAC PDU, the MAC PDU has 6 bits of remaining space, then all remaining 8 bits Fill it up.

In order to facilitate the understanding of the idea of the present invention, the above-mentioned special value is also used to describe the unpacking process of the receiving end at the same time. When receiving the MAC PDU, the receiving MAC layer first parses the MAC header structure. Since the receiving end knows that the MAC header structure is an integer byte, when parsing the last indication fields LCID, L, and E (according to the indication of E) It can be determined that it is 26 bits, so the next 6 bits are discarded as padding, and the MAC SDU is parsed starting from 32 bits, and the 8-bit padding is also discarded. Similarly, the parsing process for the RLC PDU is similar to the above process, and will not be described here.

As can be seen from the above example, if the fixed part and the expandable part of the RLC header structure satisfy the entire byte requirement according to the prior art processing method, the fixed part SN+SI field of the RLC header structure needs 16 bits, LI+E. It also needs 16bit, and the RLC header structure needs to be filled with 48 bits in total; and the method of the present invention only needs 32 bits, so the waste of resources can be greatly reduced. In particular, when a plurality of small RLC SDUs or RLC SDU segments are cascaded to form an RLC PDU, the number of bits of the header structure that can be saved by the method of the present invention will be more significant. π The invention may be embodied in various other modifications and changes without departing from the spirit and scope of the inventions. It is intended to fall within the scope of the appended claims.

Claims

Claim

A method for processing a protocol data unit PDU padding, characterized in that the method comprises the following steps:

Radio link control RLC layer receives the RLC service data unit SDU sent by the network layer;

Segmenting, cascading the received RLC SDU, and adding a corresponding RLC header structure to generate an RLC PDU, and filling the RLC header structure when the size of the RLC header structure is not an entire byte The number of bits in which the RLC header structure differs from the entire byte.

The processing method of the PDU padding according to claim 1, wherein after the segmentation, cascading, and adding the corresponding RLC header structure to generate the RLC PDU, the method further includes:

Sending the generated RLC PDU to the medium access control MAC layer;

The MAC layer groups the RLC PDU as a MAC SDU, and adds a corresponding MAC header structure. When the size of the MAC header structure is not an entire byte, the MAC header structure is filled with the MAC. The number of bits of the header structure that differs from the entire byte, and padding the padding in the MAC PDU payload such that the size of the MAC PDU is the same as the total size allocated to the MAC transport block.

The processing method of the PDU padding according to claim 2, further comprising: when the MAC layer of the receiving end unpacks the received MAC PDU, parsing the MAC header structure to obtain the indication domain LCID corresponding to each MAC SDU. , L and E, and discard the number of bits of the non-full byte after the last indication field LCID, L and E, and start with the next integer byte of the last indication fields LCID, L and E. The indication fields LCID, L and E obtain the corresponding MAC SDU and discard the padding in the MAC PDU payload.

The processing method of the PDU filling according to claim 3, further comprising: after acquiring the corresponding MAC SDU,

The MAC SDU is unpacked as an RLC PDU.

The processing method of the PDU padding according to claim 1 or 4, further comprising: when the RLC layer of the receiving end unpacks the RLC PDU, the last indicator in the RLC header structure indicates the domain LI and E The number of bits of the entire byte is discarded, and the corresponding RLC SDU is obtained according to the indication fields LI and E in the RLC header structure starting from the next integer byte of the last indication fields LI and E. Or RLC SDU segmentation.

The method according to claim 1 or 2, characterized in that the number of padding bits is between 1 and 7 bits.

A transmitting end device for implementing a PDU filling process, comprising: an RLC layer processing unit and a MAC layer processing unit, wherein

The RLC layer processing unit is configured to perform packet processing including segmentation, cascading, and padding RLC header structures on the RLC PDU to be sent, and send the packetized data to the MAC layer, where the RLC is When the size of the header structure is not a whole byte, the number of bits in which the RLC header structure differs from the entire byte is filled in the RLC header structure;

The MAC layer processing unit is configured to: group the RLC PDU sent by the RLC layer as a MAC SDU, add a MAC header structure, and fill processing, and send the processed data to the physical layer, where the MAC header is When the size of the structure is not a full byte, the number of bits in which the MAC header structure differs from the entire byte is filled in the MAC header structure, and padding in the MAC PDU payload is filled to make the MAC PDU The size is the same as the total size allocated to the MAC transport block.

The device according to claim 7, wherein the RLC layer processing unit further includes an RLC layer packet module, an RLC layer filling module, and an RLC layer transceiver module.

The RLC layer grouping module is configured to segment and cascade the received RLC SDU, and add a header structure filled by the RLC layer filling module, and then send the packaged RLC PDU to the layer. Said RLC layer transceiver module;

The RLC layer filling module is configured to fill, in the RLC header structure, the number of bits of the RLC header structure that is different from the entire byte, and send the filled RLC header structure to the RLC layer group packet module of the layer;

The RLC layer transceiver module is configured to receive the RLC SDU sent by the network layer, send the received RLC SDU to the RLC layer group packet module of the layer, and send the packaged RLC PDU to the MAC layer.

The sender device according to claim 7 or 8, wherein the MAC layer processing unit further includes a MAC layer group packet module, a MAC layer padding module, and a MAC layer transceiver module, where The MAC layer grouping module is configured to group the RLC PDUs sent by the RLC layer as a MAC SDU, add a MAC header structure, and package the filled MAC PDUs, and send the packets to the MAC layer of the local layer. Module

The MAC layer filling module is configured to fill, in the MAC header structure, a number of bits in which the MAC header structure is different from an entire byte, and fill a padding item in the MAC PDU payload to make the size of the MAC PDU The total size allocated to the MAC transport block is the same;

The MAC layer transceiver module is configured to receive the RLC PDU sent by the RLC layer, and send the packaged MAC PDU to the physical layer.

A receiving end device for implementing a PDU filling process, comprising: a MAC layer processing unit and an RLC layer processing unit, wherein

The MAC layer processing unit is configured to unpack the received MAC PDU, decrypt the MAC SDU, and discard the padding in the MAC header structure and the padding in the MAC PDU payload, and then the solved MAC SDU Send to the RLC layer;

The RLC layer processing unit is configured to unpack the MAC SDU sent by the MAC layer as an RLC PDU, discard the number of bits filled in the RLC header structure, obtain an RLC SDU or an RLC SDU segment, and then unpack the packet. The RLC SDU is sent to the network layer, or the unpacked RLC SDU segments are assembled into RLC SDUs and sent to the network layer.

The receiving end device according to claim 10, wherein the MAC layer processing unit further includes a MAC layer unpacking module and a MAC layer transceiver module, where

The MAC layer unpacking module is configured to unpack the received MAC PDU, and extract the MAC SDU, and the internal MAC layer de-filling module fills the padding in the MAC header structure and the padding in the MAC PDU payload. Discarding, and sending the de-populated MAC SDU to the MAC layer transceiver module of the layer;

The MAC layer transceiver module is configured to receive MAC PDU data, and send the received MAC PDU to the MAC layer unpacking module of the local layer, and send the MAC SDU sent by the MAC layer unpacking module of the layer. Send to the RLC layer.

The receiving end device according to claim 10 or 11, wherein the RLC layer processing unit further comprises an RLC layer unpacking module and an RLC layer transceiver module, wherein

The RLC layer unpacking module is configured to solve the received MAC SDU as an RLC PDU. The packet obtains the corresponding RLC SDU or RLC SDU segment, and the internal RLC layer de-filling module removes the number of bits filled in the RLC header structure, and sends the obtained RLC SDU to the RLC layer transceiver module of the layer. Or assembling the obtained RLC SDU segment into the RLC layer transceiver module sent by the RLC SDU to the layer;

The RLC layer transceiver module is configured to receive a MAC SDU sent by the MAC layer, and send the received MAC SDU to the RLC layer unpacking module of the layer, and the unpacked or assembled RLC SDU Sent to the network layer.

13. A system for implementing PDU padding processing, comprising: a transmitting device and at least one receiving device,

The sending end device is configured to: when the packet size of the MAC PDU is grouped, if the size of the MAC header structure is not an integer byte, the MAC header structure is filled with the difference between the MAC header structure and the entire byte. a number of bits, and padding the padding in the MAC PDU payload such that the size of the MAC PDU is the same as the total size allocated to the MAC transport block;

The receiving end device is configured to receive a MAC PDU sent by the sending end device, parse the MAC header structure to obtain a corresponding indication field, discard the number of bits filled in the MAC header structure, and use the last indication field LCID The next full byte of L, E and E is the starting point to obtain the corresponding MAC SDU according to the indication field in the MAC header structure.

The system for implementing PDU filling processing according to claim 13, wherein the RLC PDU is obtained by grouping, by the sending end device, an RLC SDU sent by a network layer, and the sending end device is in the When the RLC SDU performs the group packet, if the size of the RLC header structure is not an integer byte, the number of bits in which the RLC header structure differs from the entire byte is filled in the RLC header structure.

The system for implementing PDU filling processing according to claim 14, wherein the receiving end device is further configured to perform further unpacking using the acquired MAC SDU as an RLC PDU, where the receiving end device uses the RLC. The number of bits filled in the header structure is discarded, and the corresponding RLC SDU or RLC SDU segment is obtained according to the indication fields LI and E in the RLC header structure starting from the next integer byte of the last indication fields LI and E. .

A terminal comprising the transmitting device according to claim 7 and the receiving device according to claim 10.

A base station, comprising the transmitting device and the right according to claim 7 The receiving end device of claim 10.

An RLC PDU structure, wherein at least one of the indication fields LI and E in the RLC header structure is a non-integer byte, and the RLC header structure further has a padding item to enable the RLC. The size of the header structure is an entire byte, and the size of the padding item is between 1 and 7 bits.

19. The RLC PDU structure according to claim 18, wherein there is no indication information for the padding item in the RLC header structure in the RLC PDU. ,

A MAC PDU structure, characterized in that at least one of the indication fields LCID, L and E in the MAC header structure is a non-integer byte, and the MAC header structure further has a padding item to enable The size of the MAC header structure is a whole byte, and the size of the padding item is between 1 and 7 bits.

21. The MAC PDU structure according to claim 20, wherein there is no indication information for the padding item in the MAC header structure in the MAC PDU.

The MAC PDU structure according to claim 20, further comprising: a padding item in the payload of the MAC PDU, the padding item in the payload to allocate the size and allocation of the MAC PDU to The total size of the MAC transport blocks is the same.