WO2009009990A1

WO2009009990A1 - Method for transmitting and receiving data, network side device, subscriber side device and system

Info

Publication number: WO2009009990A1
Application number: PCT/CN2008/071563
Authority: WO
Inventors: Fei Shao
Original assignee: Shanghai Huawei Technologies Co., Ltd.
Priority date: 2007-07-16
Filing date: 2008-07-07
Publication date: 2009-01-22
Also published as: CN101350692A

Abstract

A method for transmitting and receiving data and a data transmission system, a network side device, a subscriber side device, wherein, the method for transmitting data comprises: the data stream of the different logic channels is scheduled; the scheduled data stream is segmented and/or cascaded, the segmented and/or cascaded data stream is transmitted according to the quality of the service.

Description

Data transmission and reception method, network side device, user side device and system

This application claims priority to Chinese Patent Application No. 200710043993.0, entitled "Data Transmission Method, Data Receiving Method, Network Side Device and User Side Device", filed on July 16, 2007. The content is incorporated herein by reference. Technical field

The present invention relates to the field of communications technologies, and in particular, to a data transmitting method, a data receiving method, a network side device, and a user side device.

Background technique

The Universal Mobile Telecommunication System (UMTS) is one of the world's leading third-generation mobile communications (3G) systems. The UMTS system consists of three parts, namely Core Network ("CN"), Universal Mobile Telecommunications System (UTRAN), and User Equipment (UE, User Equipment). The interface between the CN and the UTRAN is usually defined as an Iu interface, and the interface between the UTRAN and the UE is defined as a Uu interface.

The earliest protocol version of UMTS is R99. In this version, the bearers of uplink and downlink services are based on dedicated channels, and the data transmission rate that can be achieved is 384Kbps. However, with the increasing demand for high-speed data transmission, the UMTS standards development organization has successively introduced the protocol specifications of the three phases of R4, R5 and R6, and introduced High Speed Downlink Packet Access (referred to as High Speed Downlink Packet Access). "HSDPA" technology and High Speed Uplink Packet Access (HSUPA) technology can provide peak rates of up to 14.4Mbps and 5.76Mbps, respectively, while greatly improving spectrum efficiency.

The prior art proposes a data transmission method based on high-speed packet access, which introduces a medium access control-high speed (MAC-hs, medium access control-high speed) entity on the UTRAN network side and the user side of the UMTS system. . The MAC-hs entity on the network side transmits data through Hybrid Automatic Repeat Request (HARQ), and the MAC-hs entity on the user side performs single-bit signaling feedback ACK/NACK on the received data through the HARQ entity. If the data is received correctly, the ACK is fed back, otherwise the NACK is fed back, and the network layer performs data transmission based on the received signaling. If an ACK is received, the new data is continuously sent, otherwise the retransmission is performed until the maximum number of retransmissions is reached. . When a certain service data reaches the maximum number of retransmissions and When the transmission error still occurs, the HARQ transmission is terminated, and the lost data is recovered by the Radio Link Control (RLC), and the data in the cache can also be configured with a timer, and is not scheduled for a long time. The data is discarded.

In the process of implementing the present invention, the inventors have found that at least the following problems exist in the prior art: The foregoing prior art can provide a higher data rate, and the prior art does not separately transmit and transmit services of multiple modes on the network side. And the same rearrangement mode is used for the services of the multiple modes on the user side, so that when multiple modes of services coexist, the quality of service (QoS, Quality of Service) of different modes of services is on the network side and the user side. It is difficult to guarantee.

Summary of the invention

The embodiments of the present invention provide a data sending method, a data receiving method, a network side device, and a user testing device, so as to support high-speed transmission and meet the service quality requirements of different modes of services.

To solve the above technical problem, an aspect of an embodiment of the present invention provides a data sending method, including:

Scheduling data streams of different logical channels;

The scheduled data stream is segmented and/or concatenated, and the divided and/or concatenated data streams are transmitted according to the quality of service.

The network side device according to the foregoing embodiment of the present invention provides a network side device, where the network side device includes:

a queuing unit, configured to schedule data streams of different logical channels;

a segmentation and/or cascading unit for segmenting and/or cascading data streams output by the queuing unit; and a transmission unit for transmitting the segmented and/or concatenated data streams according to quality of service. Another aspect of the present invention provides a data receiving method, the method comprising: rearranging received segmented and/or concatenated data streams according to quality of service;

The reorganized data streams are reassembled, and the reassembled data streams are sent to their respective logical channels.

According to the foregoing data receiving method, an embodiment of the present invention provides a user side device, where the user side device includes:

a rearrangement unit, configured to rearrange the received divided and/or concatenated data streams according to the quality of service; a reorganization unit, configured to reorganize a data stream output by the rearrangement unit;

An allocating unit, configured to send the data stream processed by the reassembly unit to a respective logical channel.

Another aspect of the present invention provides a data transmission system, where the system includes: a network side device, configured to allocate data flows of different logical channels to a priority queue, and then compare data in the queue according to priority order. The flow is scheduled, the scheduled data stream is segmented and/or concatenated, and the divided and/or concatenated data streams are transmitted according to the quality of service;

a user equipment, configured to receive the data stream that is divided and/or concatenated, and to reorder the data stream according to the quality of service, and reorganize the data stream obtained by rearranging to obtain data scheduled on the network side. The stream is then sent to the respective logical channel.

The above technical solutions have the following advantages or benefits:

1. The embodiment of the present invention needs to segment and/or cascade the scheduled data streams, and then transmit the divided and/or concatenated data streams according to the quality of service, and the quality of service is usually based on services. Compared with the prior art, the prior art cannot transmit different services according to the quality of service. The embodiment of the present invention can meet the service quality requirements of different modes of services while supporting high-speed transmission.

2. The embodiment of the present invention first reorders the received divided and/or concatenated data streams according to the quality of service, and the quality of service is differentiated according to the service mode, so that the services of different modes can be The data flow is rearranged and compared with the prior art for the multi-mode service. The embodiment of the present invention can satisfy the service quality of different mode services in the case where multiple modes of services coexist. Requirements, but also support high-speed transmission.

DRAWINGS

1 is a schematic diagram of a MAC-hs entity on a UTRAN side according to an embodiment of the present invention;

2 is a schematic diagram of a user-side MAC-hs entity in an embodiment of the present invention;

3 is a flowchart of a data sending method according to an embodiment of the present invention;

4 is a flowchart of a data receiving method according to an embodiment of the present invention;

FIG. 5 is a schematic diagram of a network side device according to an embodiment of the present invention; FIG.

FIG. 6 is a schematic diagram of a user side device according to an embodiment of the present invention.

detailed description

Embodiments of the present invention provide a data sending method, a data receiving method, a network side device, and a user side. The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

1 is a schematic diagram of a MAC-hs entity on a UTRAN side according to an embodiment of the present invention. As shown in FIG. 1, the embodiment of the present invention evolves correspondingly to the function and architecture of a UTRAN-side MAC-hs entity in an existing high-speed packet access system. The data streams from different high-level logical channels are allocated to different priority queues, and the data flows in the queue are scheduled according to the priority. The outputted scheduled data stream is segmented and/or cascaded according to the size of the air interface data transfer block (TB), so that the air interface resources can be fully utilized and unnecessary overhead can be reduced.

At the same time, according to the quality of service (such as bit error rate and delay), the data stream after segmentation and/or cascading is transmitted. When the service has high error rate requirement and low delay requirement, for example, AM mode service. Or other mode service requiring high bit error rate, buffering the divided and/or concatenated data streams, and waiting for retransmission when the data stream fails to transmit; when the service has low bit error rate requirements, and When the delay requirement is high, such as UM or transparent mode service, the data stream after the segmentation and/or cascading is not cached, and there is no need to wait for retransmission when the data stream transmission fails. In this way, the embodiment of the present invention can meet the service quality requirements of different mode services when supporting high-speed transmission.

In addition, in order to further increase the data transmission rate, the divided and/or concatenated data streams may be multiplexed to generate TB, and then the bottom layer transmission in the TB manner, for example, HARQ transmission.

Compared with the evolution of the UTRAN side MAC-hs entity in the embodiment of the present invention, the embodiment of the present invention also changes the user side MAC-hs entity accordingly.

Referring to FIG. 2, FIG. 2 is a schematic diagram of a user-side MAC-hs entity according to an embodiment of the present invention. As shown in FIG. 2, the TB transmitted by the network side is received first, and then the received TB is demultiplexed to obtain a network-side MAC-hs entity segmentation. And/or the data stream output by the cascading module, such as MAC SDU (Service Data Unit, ServiceDataUnit). The data streams are allocated to different re-arranged queues, and the received data streams are rearranged according to the service quality of different modes of service, so that each mode service corresponds to a re-arrangement mode, for example, an acknowledgement mode ( AM, Acknowledged Mode) rearrangement and non-acknowledgement mode (UM, Unacknowledged Mode) rearrangement, etc., at the same time, when the service is in the AM mode, a status report is generated according to the rearrangement result, and the status report notification data is sent to the network side. The stream receives the situation, and then requests the network side to retransmit according to the receiving situation; when the service is in the UM mode, the status report is not generated, and the network side retransmission is not requested. Therefore, in the case that the embodiments of the present invention coexist in multiple modes of services, It can also meet the service quality requirements of different modes of business. The rearranged data is then reassembled and the data streams are delivered to the respective logical channels based on the field indications in the reassembled data stream.

The flow of the data transmission method on the UTRAN side will be described below with reference to FIG. 1 and FIG. 3, which specifically includes the following steps:

Step 301: The MAC-hs entity receives a high-level data stream.

Step 302: The priority queue module presets the priority of each queue, such as 1 - 8, 1 is the highest priority, and so on. The data streams from the higher layer logical channels are then allocated to different priority queues according to the QoS, and the QoS can be obtained by parameters carried by the upper layer. The data stream in the queue is then scheduled according to priority, and the data stream in one or more queues can be transmitted at each transmission time interval (ΤΉ, transmission time Interval).

Optionally, if the priority of each logical channel is preset, data flows from different upper logical channels are allocated to corresponding priority queues according to the priority.

Step 303: Since the high-level data stream received by the MAC-hs entity is a fixed size, such as a MAC-d PDU (Protocol Data Unit), when the MAC-d PDU cannot exactly meet an air interface data transmission block (TB, When the size of the transport block ), the splitting and/or cascading module receives the scheduled data stream output by the priority queue module, and then splits and/or cascades the data stream according to the size of the TB, for example, when the data unit occupies the storage When the space is larger than the size of the air interface data transmission block, one data unit is divided into at least two parts; when the storage space occupied by the data unit is lower than the size of the air interface data transmission block, multiple data units are cascaded so as to satisfy one The size of the TB can prevent data from being too large to be transmitted, or waste air resources.

The split and/or concatenated data streams are usually transmitted according to the quality of service, and the quality of service is differentiated according to the service mode. For the AM mode data stream, it is not sensitive to the delay, but the bit error rate is required. Highly, the type of data stream is buffered in the retransmission buffer module, waiting for retransmission when the data stream fails to transmit, ensuring a lower bit error rate; and for the UM or transparent mode data stream, due to its delay Sensitive, but features that require less bit error rate, do not need to cache the data stream.

Step 304: Perform multiplexing on the data stream output after segmentation and/or cascading to generate TB.

Step 305: Receive a TB generated by multiplexing, and place the TB into one of the processes for bottom layer transmission, such as HARQ transmission.

It is worth noting that step 304 is an optional step that can be used for splitting and/or cascading data streams. If no multiplexing is performed, step 305 is directly executed.

The flow of the UE side data receiving method is described below with reference to FIG. 2 and FIG. 4, which specifically includes the following steps:

Step 401: Receive a data transmission block sent by the network side, and perform single-bit signaling feedback on the received data transmission block. For each process, if the reception is correct, feedback ACK, request the network side to send new data; if receiving error, feedback NACK, request network side retransmission until the maximum number of retransmissions or transmission is correct.

Step 402: Demultiplexing the received data transport block to obtain one or more network-side MAC-hs entity partitioning and/or cascading output data streams.

Step 403: Send the divided and/or concatenated data streams to respective corresponding queues according to field parameters in the data header. The data stream is usually sent to the corresponding queue according to the queue number field in the data header. The queue number field indicates the priority number corresponding to the network side priority queue.

Step 404: Rearrange the data stream according to a transmission sequence number (TSN, Transmission Sequence Number) and different modes. When different modes are set for different rearrangement queues, the network side may display signaling (such as radio resource control). The signaling is negotiated with the user side. Generally, the priority queue on the network side corresponds to the service mode on the user side. According to the service mode of different queues on the network side, different reordering algorithms can be set for different reorder queues. Therefore, after receiving the data stream, the user side can perform different mode reordering for the data stream according to the queue number field in the data header.

The data stream is usually rearranged according to the quality of service, and the quality of service is differentiated according to the service mode. For example, the data stream of the UM or transparent mode is sent to the UM mode reordering module, and the data stream of the AM mode is sent to the AM mode. Arrange the modules and rearrange them according to their respective rearrangement algorithms.

For the AM mode service, due to its high-level retransmission feature, a status report can be generated during reordering, and sent to the network side to notify the data stream reception condition, so that the network side can perform retransmission or new data transmission; and the UM mode Due to the delay sensitivity characteristics of the data stream, there is no need to generate a status report, and the rearranged data stream is directly delivered to the upper layer.

Step 405: The reassembly module reassembles the received reordered data stream, where the reassembled data stream is a data stream scheduled on the network side.

Step 406: Send the reassembled data stream to the corresponding logical channel according to the field parameter in the data header. It should be noted that, in the foregoing embodiment, the data is transmitted by using the HARQ method, and in addition, the data may be transmitted by using continuous ARQ, selecting a retransmission ARQ, or the like.

In addition, those skilled in the art can understand that all or part of the steps in implementing the above embodiments can be completed by a program indicating related hardware, and the program can be stored in a computer readable storage medium, and the program is executed. When, include the following steps:

Scheduling data streams of different logical channels;

The other program may be stored in a computer readable storage medium, and when executed, the program includes the following steps:

Re-arranging received and/or concatenated data streams based on quality of service;

The reorganized data stream is reassembled, and the reassembled data stream is sent to the respective logical channel.

The storage medium may be a ROM, a RAM, a magnetic disk or an optical disk, or the like.

The network side device is described below with reference to FIG. 5, where the network side device includes:

The queuing unit 501 is configured to allocate data streams of different logical channels to the priority queue, and schedule the data flows in the queue according to the priority order. Wherein, when scheduling the data streams in the queue, each TTI can transmit data streams of one or more queues.

The segmentation and/or cascading unit 502 is configured to divide and/or cascade the data stream output by the queuing unit 501 according to the size of the TB. When the storage space occupied by the data unit is larger than the size of the air interface data transmission block, one data is used. The unit is divided into at least two parts; when the storage space occupied by the data unit is lower than the size of the air interface data transmission block, the plurality of data units are cascaded so as to meet the size of one TB, thereby preventing the data from being too large to be transmitted. Or too little waste of air resources.

The transmission unit 506 therein includes:

The buffer unit 503 is configured to cache the data stream output by the segmentation and/or the cascading unit 502 when the service is in the AM mode, and wait for retransmission when the underlying data transmission fails.

The multiplexing unit 504 is configured to multiplex the data stream output by the segmentation and/or cascading unit 502 to generate a data transmission block, and multiplex the data stream output by the buffer unit 503 to generate a data transmission block.

The bottom layer transmission unit 505 is configured to perform bottom layer transmission on the data transmission block sent by the multiplexing unit 504. It should be noted that the underlay transmission unit 505 can transmit data TB by using HARQ, continuous ARQ, selective retransmission ARQ, and the like.

It is also worth noting that the multiplexing unit 504 can be integrated inside the underlying transmission unit 505.

The user side device is described below with reference to FIG. 6, and the user side device includes:

The receiving unit 601 is configured to receive a data transmission block sent by the network side, perform single-bit signaling feedback on the received data, and request the network side to send new data when the feedback is received correctly, and request the network when the feedback is received incorrectly. The transmission is repeated until the maximum number of retransmissions or the transmission is correct.

The demultiplexing unit 602 is configured to demultiplex the received data transmission block to obtain one or more data streams that are divided and/or cascaded.

The distribution unit 603 is configured to send the data streams output by the demultiplexing unit 602 to different corresponding queues according to field parameters (such as a queue number field) in the data header.

The rearrangement unit 604 is configured to rearrange the data stream output by the distribution unit 603 according to the TSN and different service modes.

The report generating unit 605 is configured to generate a status report according to the result of the rearranging unit 604 when the service is in the confirm mode, and send the status report to the network side to notify the data stream receiving situation.

The reorganization unit 606 is configured to reassemble the data stream obtained by the rearrangement unit 604 to obtain a data stream scheduled on the network side.

The allocating unit 607 is configured to send the data stream processed by the reorganization unit 606 to the respective logical channel.

It should be noted that the network side device and the user side device described above may be implemented by software or hardware modules having the same or corresponding functions in addition to the above embodiments.

Additionally, a data transmission system is described, the system comprising:

a network side device, configured to allocate data flows of different logical channels to a priority queue, and then schedule the data flows in the queue according to the priority order, and divide and/or cascade the scheduled data flows, and according to The quality of service is transmitted to the segmented and/or cascaded data stream;

In summary, the embodiment of the present invention needs to segment and/or cascade the scheduled data streams. The segmented and/or concatenated data streams are then transmitted according to the quality of service, and the quality of service is usually differentiated according to the service mode, and the prior art cannot segment and/or cascade data according to the quality of service. Compared with the transmission of the stream, the embodiment of the present invention can meet the quality of service requirements of different modes of services while supporting high-speed transmission.

Further, the embodiment of the present invention first reorders the received divided and/or concatenated data streams according to the quality of service, and the quality of service is differentiated according to the service mode, so that different modes of services can be used. The data flow is rearranged, and compared with the prior art, the service of the multiple modes is compared with the same rearrangement mode. In the case where multiple modes of services coexist, the service of the different modes can also be satisfied. Quality requirements, but also support high-speed transmission.

Further, since the embodiment of the present invention needs to divide and/or cascade data streams, the air interface resources can be fully utilized, unnecessary overhead can be reduced, and data cannot be transmitted in a harsh environment.

Further, since the split and/or cascaded data streams are multiplexed to generate a data transport block and then transmitted in a data transport block manner, the data transmission rate can be further improved.

Finally, the embodiments of the present invention can be applied to other systems that need to increase the data transmission rate in addition to the applicable high-speed packet access system.

The data transmission method, the data receiving method, the data transmission system, the network side device, and the user side device provided by the embodiments of the present invention are described in detail above. The principles and implementation manners of the present invention are described herein by using specific examples. The description of the above embodiments is only for helping to understand the method of the present invention and its core ideas; at the same time, for those skilled in the art, according to the idea of the present invention, there will be changes in the specific embodiments and application scopes. In summary, the content of the specification should not be construed as limiting the invention.

Claims

Rights request

A data transmission method, characterized in that it comprises:

Scheduling data streams of different logical channels;

2. The method according to claim 1, wherein the transmitting the segmented and/or cascaded data streams according to the quality of service comprises:

When the service requires high bit error rate and the delay requirement is low, the divided and/or concatenated data streams are buffered and retransmitted when the data stream fails to be transmitted.

3. The method according to claim 1, wherein the transmitting the segmented and/or cascaded data streams according to the quality of service comprises:

The data streams obtained by splitting and/or cascading are multiplexed to generate a data transport block, and the underlying transport is performed in a data transport block manner.

4. A data receiving method, characterized in that:

The rearranged data streams are reassembled, and the reassembled data streams are sent to respective logical channels.

5. The method of claim 4, further comprising: after rearranging the received split and/or concatenated data streams based on quality of service, further comprising:

When the service is in the confirmation mode, a status report is generated according to the reordering result, and the status report is sent to the network side to notify the data stream receiving situation;

When the service is in the non-acknowledgment mode, the rearranged data stream is directly delivered to the upper layer.

A network-side device, the network-side device includes:

a segmentation and/or cascading unit for segmenting and/or cascading data streams output by the queuing unit; and a transmission unit for transmitting the segmented and/or concatenated data streams according to quality of service.

The network side device according to claim 6, wherein the transmission unit comprises: a multiplexing unit, configured to multiplex the divided and/or cascaded data streams to generate a data transmission block; The bottom layer transmission unit is configured to perform bottom layer transmission on the data transmission block output by the multiplexing unit.

The network side device according to claim 6 or 7, wherein the transmission unit further comprises:

a cache unit, configured to cache the split and/or concatenated data stream when the service is in the acknowledge mode.

A user side device, wherein the user side device comprises:

a rearrangement unit, configured to rearrange the received divided and/or concatenated data streams according to the quality of service;

a reorganization unit, configured to reorganize a data stream output by the rearrangement unit;

The user equipment according to claim 9, wherein the user equipment further comprises: a demultiplexing unit, configured to demultiplex the received data transmission block to obtain one or more divided and / or cascading output data stream;

A distribution unit, configured to send the data stream output by the demultiplexing unit to the queue.

The user side device according to claim 9 or 10, wherein the user side device further comprises:

The report generating unit is configured to generate a status report according to the reordering result when the service is in the confirmation mode, and send the status report to the network side to notify the data stream receiving situation.

The user side device according to claim 11, wherein the user side device further comprises:

The receiving unit is configured to receive a data transmission block sent by the network side, and perform single-bit signaling feedback on the received data.

13. A data transmission system, characterized in that the system comprises:

The network side device is configured to allocate data flows of different logical channels to the priority queue, and then schedule the data flows in the queue according to the priority order, divide and/or cascade the scheduled data flows, and according to the service. Quality is transmitted to the segmented and/or cascaded data stream;