CN101026410B

CN101026410B - Evolutionary configuration based base station and terminal, and its data transmitting and receiving method

Info

Publication number: CN101026410B
Application number: CN200610007911A
Authority: CN
Inventors: 邵飞
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2006-02-22
Filing date: 2006-02-22
Publication date: 2010-05-12
Anticipated expiration: 2026-02-22
Also published as: CN101026410A

Abstract

The base station includes processing unit (PU) in physical layer, and MAC unit connected to each other. MAC unit includes modules: partition concatenation module partitions and cascades data; the transmission block generation module adds the head information on data after partitioning and cascading operation to generate the transmission block (TB) sent to physical layer. PU in physical layer adds check bit on TB, and sends it to terminal. Terminal includes connected PU in physical layer, MAC unit, PDCP unit, and IP unit. PU in physical layer checks TB from the base station. In MAC unit, decomposition module removes data header to decompose TB; rearrangement module sorts the decomposed data; recombination module recombines sorted data. Parsing header of the recombined data, PDCP unit compresses data, and sends the compressed data to up layer. The invention makes better interaction between MAC layer and RLC layer, reduces unnecessary time delay, overhead, and filling operation.

Description

Base station and terminal based on evolution structure and data transmitting and receiving method thereof

Technical Field

The present invention relates to a wireless transmission system, and more particularly, to a base station and a terminal based on an evolution architecture in a wireless transmission system, and a data transmitting and receiving method thereof.

Background

UMTS employs WCDMA radio transmission technology over the air interface, divided into 3 protocol layers L1, L2 and L3 in R6, corresponding to the physical layer, data link layer and network layer of the OSI reference model, respectively, where L2 is further divided into Medium Access Control (MAC), Radio Link Control (RLC), Packet Data Convergence Protocol (PDCP) and broadcast/multicast control protocol (BMC), and its protocol structure is shown in fig. 1.

The MAC is located above the physical layer of the UMTS Terrestrial Radio Access Network (UTRAN) air interface and is a sub-layer of the data link layer L2, which masks the characteristics of the physical transmission medium and provides a means for higher layers to use the physical medium. The higher layer transmits data and signaling information through logical channels provided by the MAC, which maps the information to transport channels provided by the physical layer according to the characteristics of the physical medium and selects an appropriate transport format for each transport channel. In addition, the MAC also performs multiplexing of logical channels to transport channels, if necessary.

The MAC sublayer provides data transmission services on logical channels. For different types of data transmission services, a set of different types of logical channels is defined in the protocol, each logical channel type being defined according to the type of information it transmits: channels for transmitting control information are called control channels and include a Broadcast Control Channel (BCCH), a Paging Control Channel (PCCH), a Dedicated Control Channel (DCCH), a Common Control Channel (CCCH), and a shared channel control channel (SHCCH); channels that carry traffic information are called traffic channels and include both Dedicated Traffic Channels (DTCH) and Common Traffic Channels (CTCH).

The physical layer presents to the serving access point of the upper layer a series of transport channels, and the MAC layer is responsible for scheduling and using these transport channels, and the execution of specific protocol functions is done by the MAC entity. MAC entities can be classified into MAC-b, MAC-c/sh/m, MAC-d, MAC-hs, MAC-e/es according to the difference of the transmission channels processed. MAC-b is responsible for handling the Broadcast Channel (BCH); the MAC-c/sh/m is responsible for processing common and shared transmission channels, including a Paging Channel (PCH), a Forward Access Channel (FACH) Random Access Channel (RACH), a Downlink Shared Channel (DSCH) and an Uplink Shared Channel (USCH) in a TDD mode; MAC-d is only responsible for handling dedicated transport channels (DCH); MAC-HS is responsible for handling the high speed downlink shared channel (HS-DSCH); the MAC-E/es is responsible for handling enhanced uplink dedicated channel (E-DCH), and the MAC architecture of the User Equipment (UE) plane is shown in fig. 2.

The radio link control protocol (RLC) is located at the second layer of the air interface of the UTRAN, and provides a reliable data transmission service to the upper layer using a logical channel provided by the MAC sublayer, and its location and function are equivalent to the data link layer in the OSI reference model, which is an important link for guaranteeing quality of service (QoS) on the radio interface. Due to the very bad channel conditions in the radio propagation environment, the transmission error rate is very high, and therefore it is a difficult task to guarantee reliable transmission of data. Therefore, the third generation mobile communication system introduces many new automatic repeat request (ARQ) mechanisms in the RLC sublayer to meet the requirement of high quality of service.

RLC can provide 3 modes of data transfer service according to different levels of QoS requirements: transparent, non-confirmed and confirmed. The transparent mode has the lowest quality of service, the unacknowledged mode the next time, and the acknowledged mode has the highest quality of service. The automatic retransmission mechanism is only embodied in the RLC entity in acknowledged mode.

The RLC provides segmentation and reassembly functions for user data and control information. Each RLC entity is configured by Radio Resource Control (RRC), and supervises and controls its execution. On the user plane, the service provided by the RLC sublayer to the upper layers is called a Radio Bearer (RB); on the control plane, the service provided by the RLC sublayer to the upper layers is called a Signaling Radio Bearer (SRB). The two bearers are uniformly numbered in the RLC sublayer and the SRB can be considered as a special RB.

A prior art solution related to the present invention is described below with reference to fig. 3.

In the user plane protocol stack of R6, the RLC layer is located in a Radio Network Controller (RNC), the MAC layer is located in a base station (NodeB), and a standard interface Iub is provided between the NodeB and the RNC. When data interaction exists, the RLC layer and the MAC layer interact through an Iub interface.

With reference to fig. 4, a description will be given of a processing flow of the downlink UTRAN plane packet service in R6.

■ head compression: header compression is performed on the data stream.

■ the cascade is split: data from an upper layer is divided and concatenated into Protocol Data Units (PDUs) of equal size.

■ retransmission buffer and management (ARQ): the RLC layer automatically retransmits.

■ encryption: a Protocol Data Unit (PDU) is encrypted.

■ transport channel type switching: switching between dedicated transport channels, common transport channels and shared transport channels.

■ flow control: and controlling the flow between the NodeB and the RNC to prevent data overflow.

■ scheduling: scheduling is performed between different data streams of the same user or between data streams of different users.

■ hybrid automatic repeat request (HARQ): physical layer hybrid automatic retransmission.

■ physical layer processing: and after the physical layer adds the cyclic redundancy check to the transmission block, the transmission block is sent to the UE through an air physical channel.

As shown in fig. 4, in UTRAN, the RNC includes a PDCP unit, an RLC unit, and a MAC-d unit connected in sequence, and the NodeB includes a MAC-hs unit and a physical layer processing unit connected in sequence. On the RNC, the PDCP unit comprises a header compression module, the RLC unit comprises a segmentation cascade module, an ARQ module and a ciphering module, and the MAC-d unit comprises a transmission channel type switching module and a flow control module. On NodeB, the MAC-hs unit comprises a scheduling module and an HARQ module.

With reference to fig. 5, a description is given of a processing flow of the downlink UE-plane packet service in R6.

■ physical layer processing: the transport blocks from the base station are received from the physical layer and a cyclic redundancy check is performed.

■ rearrangement queue distribution: and routing the data to the corresponding rearrangement cache according to the queue number.

■ rearrangement: the data is reordered according to the transmission sequence number.

■ decomposition: and decomposing the data, and taking out the header information and filling.

■ decryption: the data is decrypted.

■ ARQ: the RLC layer automatically retransmits.

■ recombining: and recombining the decomposed data.

■ decapsulation: and performing de-header compression on the data stream.

As shown in fig. 5, the UE in UTRAN includes a physical layer processing unit, a MAC-hs unit, a MAC-d unit, a RLC unit, and a PDCP unit, which are connected in sequence. The MAC-hs unit comprises an HARQ module, a rearrangement queue distribution module, a rearrangement module and a decomposition module, the RLC unit comprises a decryption module, an ARQ module and a recombination module, and the PDCP unit comprises a header compression module.

Firstly, from the view of the protocol layer architecture, the RLC layer and the MAC layer are respectively located on different network nodes NodeB and RNC, and their data interaction needs to pass through the Iub interface, which inevitably brings unnecessary time delay.

Moreover, when they are located in different network nodes, since the upper network node does not know the specific data transmission condition of the lower network node, i.e. the RNC does not know the NodeB specific data transmission information, it is easy to cause an invalid RLC retransmission in the case of RLC retransmission. Because the RLC layer of the RNC retransmits PDUs which are not acknowledged to the NodeB according to the current RLC retransmission mechanism, when the data size is large, part of the data retransmitted from the RNC in the NodeB is not transmitted in time, and the UE feeds back non-acknowledgement information, so that the RNC retransmits the data according to the non-acknowledgement information of the UE, which may not be transmitted in the NodeB, thus resulting in invalid retransmission of the data and wasting the bandwidth of the Iub port.

Secondly, the segmentation concatenation is performed in R6 at the RLC layer, which is located at the RNC and is difficult to know the empty space condition, so that the data from the segmentation concatenation is difficult to match with the transport blocks allowed by the empty space, and unnecessary padding (padding) is caused.

Finally, the functions of the RLC layer and the MAC layer are redundant and repeated, for example, the two layers have a cascade function, an automatic retransmission function, an encryption function and the like; and some functions may not be needed in long term evolution architecture (LTE), such as dynamic transport channel type switching, transparent transport mode, etc. These redundant functions introduce complexity and additional processing delay to the existing protocols.

Disclosure of Invention

In view of the above-mentioned drawbacks in the prior art, the present invention provides a base station and a terminal based on an evolution architecture and a data transmitting and receiving method thereof, so as to integrate some functions based on the existing protocol, remove unnecessary functions, and transplant some functions to the most suitable place.

In one aspect, a method for transmitting data of a base station based on an evolved node b is provided. The method comprises the following steps:

A. segmenting and cascading data at a Media Access Control (MAC) layer;

B. adding header information to the segmented and cascaded data to generate a transmission block and sending the transmission block to a physical layer through a transmission channel;

C. and adding check bits to the transmission blocks in the physical layer and then sending the transmission blocks to the terminal.

The above method further comprises the step performed in step B or C of: physical layer buffering and retransmission (HARQ) is performed on the transport block.

The step A also comprises at least one of the following steps:

performing high-level caching and retransmission (ARQ) on data reaching an MAC layer or data after segmentation and concatenation;

encrypting data reaching a media access control layer or data after segmentation and concatenation, and then performing high-level cache and automatic retransmission;

and performing high-level cache and automatic retransmission on the data reaching the media access control layer or the data after segmentation and concatenation, and then encrypting.

The step A further comprises the following steps:

scheduling based on quality of service (QoS) is carried out among all data flows, and then a media access control layer carries out segmentation and concatenation on the data.

The above method further comprises the step performed in step B or C of: and selecting proper transmission formats for the transmission blocks of different services.

The above method further comprises the steps performed before said splitting of the cascade in step a: and multiplexing the data streams with the same quality of service (QoS).

The above method further comprises the step performed before step a of: header compression is performed on the data stream at the packet data convergence protocol PDCP layer.

The above method further comprises the steps performed before said header compression or before said split concatenation in step a: and multiplexing the data streams with the same quality of service (QoS).

On the other hand, a data receiving method of a terminal based on an evolution architecture is provided. The method comprises the following steps:

A. after the physical layer checks the transmission block from the base station, the transmission block is sent to a Media Access Control (MAC) layer;

B. decomposing the transport block by removing the data header;

C. sorting the decomposed data;

D. reorganizing the sorted data;

E. and the data flow is decompressed at the PDCP layer and then sent to a higher layer.

The step B further includes the step performed before the decomposition of the transport block: and carrying out physical layer feedback on the transmission block with the transmission error or the lost transmission block and requesting the base station to retransmit corresponding data.

The above method further comprises the step performed after said decomposing the transport block in step B or after said reassembling the data in step D of: and performing high-level feedback on the data with the transmission errors and requesting the base station to retransmit corresponding data.

The above method further comprises the steps performed after said sorting in step C or before said de-header compression in step E of: the data is decrypted.

The method further comprises demultiplexing the data streams with the same quality of service (QoS) after the reassembly in step D or after the header decompression in step E; alternatively, the method further comprises the step, performed after step E, of: and the higher layer demultiplexes the data streams with the same service quality.

The step B further includes the step performed before the decomposition of the transport block: data flows with the same quality of service QoS are routed to the same queue.

In yet another aspect, an evolved architecture based base station is provided. The base station comprises a physical layer processing unit and a Media Access Control (MAC) unit which are connected. The media access control MAC unit comprises a segmentation and concatenation module used for segmenting and concatenating data; the transmission block generating module is used for adding header information to the segmented and cascaded data to generate a transmission block and sending the transmission block to a physical layer through a transmission channel; and the physical layer processing unit is used for adding check bits to the transmission blocks and then sending the transmission blocks to the terminal.

The MAC unit or the physical layer processing unit further includes a hybrid automatic repeat request (HARQ) module configured to perform physical layer buffering and retransmission for the transport block.

The MAC unit also comprises a retransmission buffer and management (ARQ) module for performing high-level buffer and automatic retransmission on the data received by the media access control unit or the segmented and cascaded data; or,

an encryption module for encrypting the data received by the media access control unit or the segmented and cascaded data, and a retransmission cache and management (ARQ) module for performing high-level cache and automatic retransmission on the output of the encryption module; or,

a retransmission buffer and management (ARQ) module for performing high-level buffer and automatic retransmission on the data received by the media access control unit or the segmented and cascaded data, and an encryption module for encrypting the output of the ARQ module.

The MAC unit further includes: and the scheduling module is used for scheduling based on the QoS among the data streams, and the output of the scheduling is used for dividing the cascade.

The MAC unit further includes a transport format selection module for selecting a transport format for a transport block to be transmitted to the physical layer; alternatively, the physical layer processing unit further comprises a transport format selection module for selecting a transport format for a transport block to be sent to the terminal.

The MAC unit further includes a QoS-based multiplexing module configured to multiplex data streams with the same QoS received by the MAC unit, and an output of the QoS-based multiplexing module is used for splitting the concatenation.

The base station further comprises a packet data convergence protocol PDCP unit connected to the MAC unit, the PDCP unit comprising a header compression module for header compressing the data stream.

The PDCP unit or the MAC unit further includes a QoS-based multiplexing module, configured to multiplex data streams with the same QoS received by the PDCP unit or the MAC unit, where an output of the QoS-based multiplexing module is used for splitting concatenation.

In yet another aspect, an evolved architecture-based terminal is presented. The terminal comprises a physical layer processing unit, a Media Access Control (MAC) unit, a Packet Data Convergence Protocol (PDCP) unit and a service data high-level processing unit which are connected in sequence. Wherein,

the physical layer processing unit is used for receiving the transmission block from the base station from the physical layer and checking the transmission block,

the media access control MAC unit comprises a decomposition module used for decomposing the transmission block by removing the data head; the rearrangement module is used for sequencing the decomposed data; a reorganization module for reorganizing the sorted data,

the packet data convergence protocol PDCP unit comprises a header decompression module used for decompressing the header of the data flow and then sending the compressed data flow to a higher layer.

The MAC unit further includes a hybrid automatic repeat request (HARQ) module, configured to perform physical layer feedback on a transport block with transmission error or a lost transport block that reaches the MAC unit and request the base station to retransmit corresponding data.

The MAC unit further includes a retransmission buffer and management (ARQ) module connected to the decomposition module or the reassembly module, and configured to perform high-level feedback on data with transmission errors and request the base station to retransmit corresponding data.

The MAC unit or PDCP unit further includes a decryption module, configured to decrypt the data sorted by the rearrangement module, and an output of the decoding module is provided to the reassembly module for reassembly.

The MAC unit or PDCP unit or service data high-level processing unit further includes a quality of service QoS-based demultiplexing module configured to demultiplex data streams with the same quality of service QoS, and an output of the quality of service-based demultiplexing module is provided to a packet data convergence protocol unit for header decompression; or,

the packet data convergence protocol unit also comprises a demultiplexing module based on the service quality, which is used for demultiplexing the data streams with the same service quality, and the output of the demultiplexing module based on the service quality is provided for the packet data convergence protocol unit to perform header decompression or is sent to a high layer; or,

the service data high-level processing unit also comprises a demultiplexing module based on the service quality, which is used for demultiplexing the data streams with the same service quality provided by the packet data convergence protocol unit.

The MAC unit also comprises a transmission block queue distribution module which is used for routing the data streams with the same QoS received by the unit to the same queue and then sending the data streams to the decomposition module.

The main advantages and characteristics of the invention are as follows:

1. after the RLC layer is moved down to the NodeB, the interaction between the RLC layer and the MAC layer is tighter, and the interaction delay between the original MAC layer and the RLC layer can be effectively avoided.

2. The invention enables the data after segmentation and concatenation to be better matched with the air interface, reduces overhead (overhead) and padding (padding), and increases the efficiency of the air interface.

3. The two layers of functions are integrated, unnecessary functions and repeated functions are reduced, the complexity of the protocol is simplified, and the data processing time delay is reduced.

4. In the original protocol, invalid retransmission caused by an RLC retransmission mechanism during RLC retransmission can be effectively avoided.

5. And the priority of the retransmission data and the QoS of the service are ensured through the scheduling function of the NodeB.

Drawings

Fig. 1 illustrates a conventional radio interface protocol architecture;

FIG. 2 is a schematic diagram of a UE-side MAC architecture;

fig. 3 shows the user plane protocol stack of R6;

fig. 4 shows a downlink UTRAN plane packet service processing flow in R6;

fig. 5 shows a downlink UE-plane packet traffic processing flow in R6;

FIG. 6 shows a protocol architecture underlying the solutions described in embodiments 1-6 of the present invention;

fig. 7 shows a processing flow of UTRAN downlink service among various modules according to embodiment 1 of the present invention;

fig. 8 shows a processing flow of the UE plane downlink service among the modules according to embodiment 1 of the present invention;

fig. 9 shows a processing flow of UTRAN downlink service among various modules according to embodiment 4 of the present invention;

fig. 10 shows a processing flow of UE downlink service among various modules according to embodiment 4 of the present invention;

FIG. 11 shows a protocol architecture underlying the solutions described in embodiments 7-12 of the present invention;

fig. 12 shows a processing flow of UTRAN downlink service among various modules according to embodiment 7 of the present invention;

fig. 13 shows a processing flow of the UE plane downlink service among the modules according to embodiment 7 of the present invention;

fig. 14 shows a processing flow of UTRAN plane downlink service among various modules according to embodiment 10 of the present invention;

fig. 15 shows a processing flow of UE downlink service among modules according to embodiment 10 of the present invention.

Detailed Description

In LTE, network architecture, protocol architecture, channel structure, etc. will be improved. Furthermore, the most fundamental point of LTE is that only packet domain services, i.e. all services will be transmitted in packets, which also means that there is no dedicated transport channel in LTE. With the introduction of Multimedia Broadcast Multicast Service (MBMS), BMC will also be cancelled.

In order to better adapt L2 to LTE, some functions need to be integrated based on the existing protocol, unnecessary functions such as some functions of the MAC layer in the original protocol for processing circuit domain services are removed, and the corresponding functions are transplanted to the most suitable place to perform better performance. Meanwhile, the structure of the existing protocol is adjusted, so that the MAC layer and the RLC layer can interact better, unnecessary time delay, invalid retransmission, overhead (overhead) and padding (padding) are reduced, and the performance of the LTE is enhanced.

Based on the requirements of LTE for low latency, high rate, and packet optimization, various improvements to the existing protocol architecture as described in the following embodiments are needed.

An embodiment 1 of the present invention is given below, and a protocol architecture of the embodiment is described with reference to fig. 6.

The RLC layer moves down to the NodeB and is combined with the MAC layer to form an MAC + layer, the RLC layer is located at the NodeB, the PDCP layer is located at a core network gateway, and the RNC is cancelled.

Referring to fig. 7, a process flow of the UTRAN plane downlink service among the modules under the protocol architecture of fig. 6 will be described.

■ head compression: header compression is performed on the data stream.

■ QoS based multiplexing: the data streams of the same QoS attributes are multiplexed.

■ scheduling: and scheduling according to the QoS attribute and the priority of the user.

■ the cascade is split: and performing segmentation and concatenation according to the size of the transmission block allowed by the air interface.

■ retransmission buffer and management (ARQ): and carrying out high-level retransmission during HARQ error transmission, wherein the retransmitted data is segmented and concatenated data, namely PDU. It is not suitable for delay-sensitive service and multicast and broadcast service, and is only suitable for delay-insensitive service in unicast service.

■ encryption: and encrypting the data after the segmentation and concatenation.

■ generate transport blocks: the PDU is added with necessary header information and padding to generate a transport block and transmitted to the physical layer via a transport channel.

■ hybrid automatic repeat request (HARQ): and (4) retransmitting the physical layer. It is only suitable for unicast service, not for multicast and broadcast service.

As shown in fig. 7, in UTRAN, the core network gateway includes a PDCP unit, and the base station (NodeB) includes a MAC + unit and a physical layer processing unit connected thereto. At the core network gateway, the PDCP unit includes a header compression module. On the NodeB, the MAC + unit comprises a multiplexing module based on the service quality, a scheduling module, a segmentation and concatenation module, an ARQ module, an encryption module, a transmission block generation module and an HARQ module.

Referring to fig. 8, a process flow of the UE downlink service among the modules under the protocol architecture of fig. 6 will be described.

■ HARQ: physical layer hybrid automatic retransmission.

■ transport block queue distribution: the data flows are routed to corresponding queues according to the quality of service attributes.

■ decomposition: and removing the data head and the padding at the bottom layer.

■ retransmission buffer and management (ARQ): and automatic retransmission at a high layer.

■ rearrangement: arranged by the serial number of the data.

■ decryption: the data is decrypted.

■ recombining: the data is reassembled into complete Service Data Units (SDUs).

■ QoS based demultiplexing: the data streams having the same QoS attribute are demultiplexed.

■ decapsulation: and performing de-header compression on the data stream.

As shown in fig. 8, a User Equipment (UE) includes a physical layer processing unit, a MAC + unit, a PDCP unit, and a service data higher layer processing unit, such as an IP unit, which are connected in sequence. The MAC + unit comprises an HARQ module, a transmission block queue distribution module, a decomposition module, an ARQ module, a rearrangement module, a decryption module, a recombination module and a demultiplexing module based on the service quality, and the PDCP unit comprises a de-header compression module. It can be seen that these functional modules on the terminal correspond to the functional modules on the base station one to one.

The above arrangement and configuration of the flows and modules is mainly for the following purposes:

after the MAC and the RLC are integrated, the integrated data transmission method is located in the NodeB, and interface delay between the original RLC and the MAC is avoided in a data processing flow.

2. The segmentation cascade is moved to the MAC for execution, because the MAC layer is close to the air interface, the segmentation cascade can be carried out on the data packet according to the quality condition of the channel, and the data packet after the segmentation cascade can better match the transmission capability of the air interface, thereby avoiding redundant filling bits and enhancing the transmission efficiency.

3. For example, after the RNC sends data requesting retransmission to the base station, the base station can only send part of the data to be retransmitted due to the limitation of the transmission capability of an air interface, and part of the data to be retransmitted is still cached in the cache of the base station, and a user does not receive the data within a certain time and sends a status report to request retransmission of the data, so that the RNC can send the data again, and the data can be cached in the cache of the base station.

4. The ARQ is put after the segmentation concatenation, i.e. the data packet after the segmentation concatenation is retransmitted. If the segmented concatenation is performed, the ARQ buffer and retransmission are the whole SDU from the higher layer, and for a large SDU, a plurality of PDUs are obtained after the segmented concatenation is performed, and as long as one PDU is not paired, the whole SDU needs to be retransmitted, which is very inefficient. This is avoided by placing ARQ after segmentation concatenation.

5. From the above architecture diagram, it can be seen that re-splitting concatenation of retransmitted data is also supported at retransmission. Since the channel quality is constantly changing, when data is retransmitted, if the size of the transport block is larger than the transmission capability allowed by the air interface, the data block may not be sent, and if the size of the transport block is smaller than the transmission capability of the air interface, redundant padding bits need to be added, which wastes resources. The situation is avoided by splitting the data retransmission again and cascading.

Embodiment 2 is the same as embodiment 1 except that the encryption in the NodeB is cancelled, the encryption is performed after header compression in the core network gateway, and the decryption of the corresponding UE plane is performed before header compression.

Embodiment 3 is that UTRAN plane QoS-based multiplexing is performed on a gateway of a core network, and the rest is the same as embodiment 1.

The protocol architecture of embodiment 4 is the same as that of embodiment 1, and the processing flow of UTRAN downlink service between the modules in this embodiment is shown in fig. 9. After the high-level retransmission and the segmentation cascade are exchanged, the high-level retransmission is to cache and retransmit SDUs from the high level, for retransmitted data, a transmitting end only needs to maintain less segmentation cascade information, and corresponding receiving end recombination is simpler. The processing flow of downlink service between the modules in the UE plane according to this embodiment is shown in fig. 10, corresponding to the UTRAN plane.

Embodiment 5 is the same as embodiment 4 except that the ciphering in the NodeB is cancelled, the ciphering is performed after header compression in the core network gateway, and the UE-plane deciphering is performed before header compression.

Embodiment 6 is to move the UTRAN plane QoS-based multiplexing to the core network gateway, and the rest is the same as embodiment 4.

The protocol structure of embodiment 7 is shown in fig. 11, where the PDCP layer is moved down to the NodeB, the MAC layer and the RLC layer are merged into a MAC + layer and located at the NodeB, and the RNC is cancelled.

Fig. 12 and 13 respectively show the processing flow of downlink services of the UTRAN plane and the UE plane between the respective modules under the protocol architecture of fig. 11.

Referring to fig. 12, a base station (NodeB) includes a PDCP unit, a MAC + unit, and a physical layer processing unit, which are connected in sequence. The PDCP unit comprises a header compression module, and the MAC + unit comprises a multiplexing module based on the service quality, a scheduling module, a segmentation cascade module, an ARQ module, a ciphering module, a transmission block generating module and an HARQ module.

Referring to fig. 13, a User Equipment (UE) includes a physical layer processing unit, a MAC + unit, a PDCP unit, and a service data higher layer processing unit, such as an IP unit, which are connected in sequence. The physical layer processing unit is configured to perform cyclic redundancy check on a transport block received on a physical channel. The MAC + unit comprises an HARQ module, a transmission block queue distribution module, a decomposition module, a retransmission cache and management module, a rearrangement module, a decryption module, a recombination module and a demultiplexing module based on the service quality. The PDCP unit includes a decapsulation header compression module.

Embodiment 8 is that UTRAN plane QoS-based multiplexing is moved to a core network gateway for execution, and then UE plane QoS-based demultiplexing is executed at an upper layer of a PDCP layer, and the rest is the same as embodiment 7.

Embodiment 9 is that UTRAN plane QoS-based multiplexing is performed before moving to PDCP layer header compression, and then UE plane QoS-based demultiplexing is performed after PDCP layer header compression, otherwise the same as embodiment 7.

Embodiment 10 is a UTRAN-oriented higher layer retransmission and segmentation cascade interchange, and the processing flow of downlink traffic among various modules is shown in fig. 14 and 15.

Embodiment 11 is that UTRAN plane QoS-based multiplexing is performed on a gateway of a core network, and then UE plane QoS-based demultiplexing is performed on an upper layer of a PDCP layer, and the rest is the same as embodiment 10.

Embodiment 12 is that UTRAN plane QoS-based multiplexing is performed before moving to PDCP layer header compression, and then UE plane QoS-based demultiplexing is performed after PDCP layer header compression, otherwise the same as embodiment 10.

In the technical scheme of the invention, the arrangement of the flow and the configuration of the modules can be adjusted according to the requirements. For example, UTRAN-level scheduling or ciphering can be performed before or after ARQ, or before or after the segmentation concatenation, while the other steps are unchanged. In particular, a transport format selection step may be added to the process of any of embodiments 1 to 12 to select an appropriate transport format for a specific service. Transport format selection may be performed either after the MAC + layer generates the transport block or at the physical layer. In addition, the HARQ process of any of embodiments 1 to 12 may be performed in the physical layer. The UE plane will adjust the modules and procedures accordingly as the UTRAN plane changes.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims

1. A data transmission method of a base station based on an evolution architecture comprises the following steps:

A. carrying out segmentation cascade on data at a media access control layer;

2. The method of claim 1, further comprising the step performed in step B or C of: and carrying out physical layer caching and hybrid automatic retransmission on the transmission block.

3. The method of claim 2, wherein step a further comprises at least one of:

carrying out high-level cache and automatic retransmission on data reaching a media access control layer or data after segmentation and concatenation;

4. The method of claim 1 or 2, wherein step a comprises the steps of: scheduling based on service quality is carried out among all data flows, and then a media access control layer carries out segmentation and concatenation on the data.

5. The method of claim 1, further comprising the step performed in step B or C of: and selecting proper transmission formats for the transmission blocks of different services.

6. The method of claim 1, further comprising the step performed prior to said splitting cascade in step a of: and multiplexing the data streams with the same service quality.

7. The method of claim 1, further comprising the step performed prior to step a of: header compression is performed on the data stream at the packet data convergence protocol layer.

8. The method of claim 7, further comprising the step performed prior to the header compression or prior to the split concatenation in step a of: and multiplexing the data streams with the same service quality.

9. A data receiving method of a terminal based on an evolution structure is characterized by comprising the following steps:

A. after the physical layer checks the transmission block from the base station, the transmission block is sent to a media access control layer;

B. decomposing the transport block by removing the data header;

C. sorting the decomposed data;

D. reorganizing the sorted data;

E. and the data flow is decompressed at the packet data convergence protocol layer and then sent to a higher layer.

10. The method of claim 9, wherein step B further comprises the step performed prior to said disassembling a transport block of: and carrying out physical layer feedback on the transmission block with the transmission error or the lost transmission block and requesting the base station to retransmit corresponding data.

11. The method of claim 10, further comprising the step performed after said decomposing the transport block in step B or after said reassembling the data in step D of: and performing high-level feedback on the data with the transmission errors and requesting the base station to retransmit corresponding data.

12. The method of claim 9, further comprising the step performed after said sorting in step C or before said de-header compression in step E of: the data is decrypted.

13. The method of claim 9, further comprising the step performed after said recomposing in step D or after said decapsulating in step E of: demultiplexing the data streams with the same service quality; or, further comprising the step performed after step E of: and the higher layer demultiplexes the data streams with the same service quality.

14. The method of claim 9, wherein step B further comprises the step performed prior to said disassembling a transport block of: and routing the data flows with the same service quality to the same queue.

15. A base station based on evolution structure comprises a physical layer processing unit and a media access control unit which are connected, and is characterized in that,

the media access control unit comprises a segmentation cascade module used for segmenting and cascading data; the transmission block generating module is used for adding header information to the segmented and cascaded data to generate a transmission block and sending the transmission block to a physical layer through a transmission channel;

and the physical layer processing unit is used for adding check bits to the transmission blocks and then sending the transmission blocks to the terminal.

16. The base station of claim 15, wherein the mac or phy processing unit further comprises a hybrid automatic repeat request module for phy buffering and retransmission of the transport block.

17. The base station of claim 16, wherein the medium access control unit further comprises:

an automatic retransmission buffer and management module for high-level buffer and automatic retransmission of the data received by the media access control unit or the data after division and cascade connection; or,

the encryption module is used for encrypting the data received by the media access control unit or the data after segmentation and concatenation, and the automatic retransmission cache and management module is used for performing high-level cache and automatic retransmission on the output of the encryption module; or,

an automatic retransmission buffer and management module for high-level buffer and automatic retransmission of the data received by the media access control unit or the data after division and cascade connection, and an encryption module for encrypting the output of the automatic retransmission buffer and management module.

18. The base station according to claim 15 or 16, characterized in that the medium access control unit comprises:

and the scheduling module is used for scheduling based on the service quality among the data streams, and the output of the scheduling is used for dividing the cascade.

19. The base station of claim 15, wherein the medium access control unit further comprises a transport format selection module for selecting a transport format for a transport block to be sent to the physical layer; alternatively, the physical layer processing unit further comprises a transport format selection module for selecting a transport format for a transport block to be sent to the terminal.

20. The base station of claim 15, wherein the medium access control unit further comprises a quality of service based multiplexing module for multiplexing data streams received by the medium access control unit with the same quality of service, and wherein an output of the quality of service based multiplexing module is used for splitting the concatenation.

21. The base station of claim 15, further comprising a packet data convergence protocol unit coupled to the media access control unit, the packet data convergence protocol unit including a header compression module to header compress the data stream.

22. The base station of claim 21, wherein the packet data convergence protocol unit or the mac unit further comprises a qos-based multiplexing module for multiplexing data streams with the same qos received by the cell in which the packet data convergence protocol unit or the mac unit is located, and an output of the qos-based multiplexing module is used for splitting the concatenation.

23. A terminal based on evolution structure comprises a physical layer processing unit, a media access control unit, a grouped data convergence protocol unit and a service data high-level processing unit which are connected in sequence, wherein: the physical layer processing unit is used for receiving the transmission block from the base station from the physical layer and checking the transmission block, and is characterized in that,

the media access control unit comprises a decomposition module used for decomposing the transmission block by removing the data head; the rearrangement module is used for sequencing the decomposed data; the recombination module is used for recombining the sequenced data;

the packet data convergence protocol unit comprises a de-header compression module used for de-header compressing the data flow and then sending the compressed data flow to a high layer.

24. The terminal of claim 23, wherein the medium access control unit further comprises a hybrid automatic retransmission module for performing physical layer feedback on the transport blocks with transmission errors or lost transport blocks arriving at the medium access control unit and requesting the base station to retransmit the corresponding data.

25. The terminal of claim 24, wherein the mac unit further comprises an automatic retransmission buffer and management module connected to the decomposition module or the reassembly module, for performing high-level feedback on the data with transmission errors and requesting the bs to retransmit the corresponding data.

26. The terminal of claim 23, wherein the mac unit or the pdcp unit further comprises a decryption module for decrypting the data sorted by the reordering module, and an output of the decoding module is provided to the reassembly module for reassembly.

27. The terminal of claim 23, wherein the mac unit further comprises a qos-based demultiplexing module for demultiplexing data streams with the same qos, and an output of the qos-based demultiplexing module is provided to the packet data convergence protocol unit for header decompression; or,

28. The terminal of claim 23, wherein the mac unit further comprises a transmission block queue distribution module, configured to route data streams with the same quality of service received by the unit in which the mac unit is located to the same queue and send the data streams to the parsing module.