WO2008134926A1

WO2008134926A1 - Method and communication system and the sender side device for realizing the inquiry processing on data packets

Info

Publication number: WO2008134926A1
Application number: PCT/CN2008/000841
Authority: WO
Inventors: Tao Yang
Original assignee: Alcatel Shanghai Bell Co., Ltd.; Alcatel Lucent
Priority date: 2007-04-30
Filing date: 2008-04-24
Publication date: 2008-11-13
Also published as: CN101299706B; CN101299706A

Abstract

A method for realizing an inquiry processing on data packets in a communication system, on the sender side, said method includes the following steps: transmitting all of the RLC layer data packets from the RLC layer to the MAC layer, and inquiry request information for indicating the inquiry request state of every data packets, on the MAC layer, receiving all the data packets from the RLC layer, and said inquiry request information, and combining the RLC data packets into a MAC data packet ,and setting the inquiry request bit of the MAC data packet based said inquiry information, then sending the MAC data packet to the receiver side. On the receiver side ,said method includes the following steps: on the MAC layer, receiving the MAC data packet from the sender, and according to the inquiry request bit determining whether to fed back a inquiry response responding to the inquiry request to the sender side.

Description

Method, communication system and transmitting device for realizing query processing of data packet

The present invention relates to the field of wireless mobile communications, and more particularly to a method, a communication system, and a transmitting device for implementing query processing for a data packet, which can be reserved by a query request bit at a MAC (Media Access Control) layer. Implementing query processing for packets can save packet space, radio resources, and eliminate the need for the RLC (Radio Link Control) layer at the receiving end. Background technique

The 3GPP (3rd Generation Partnership Project) launched the Long Term Evolution Research Project (LTE) in 2005, hoping to support the growing needs of operators and users with better data throughput and better network performance.

In LTE, a query strategy for individual or last data payload transmission has been proposed. The general idea is to request the receiver to report a report indicating whether the packet has been received correctly if the payload is a separate packet or the last packet in the buffer. Otherwise, if such a report is not received within a predetermined time, the transmitter will consider the previous transmission to be a failure and trigger an ARQ (Automatic Repeat Request) level retransmission. The goal is to resolve HARQ (Hybrid Automatic Repeat Request) feedback signaling errors in the scenario of single or last data payload transmission.

In addition, it is proposed to set a query in the RLC PDU (Radio Link Control Layer Protocol Data Unit) header.

'Bit to indicate the query request. For example, when the RLC PDU is a single or last data payload, the query bit is set to 1, and the associated RLC (Radio Link Control) layer entity should feed back the RLC PDU of the query. Received reports. Otherwise, the query bit is set to 0, and the receiving RLC layer entity does not feed back such a report, as shown in Figure 1.

However, the traditional method shown in Figure 1 has the following drawbacks:

- A query bit must be reserved for each RLC PDU regardless of whether a query is required or not. This means that in a MAC PDU (Medium Access Control Layer Protocol Data Unit), many such bits are wasted for this purpose;

- If more than one RLC PDU requires a query, then many status reports are transmitted in the Uu interface, which results in immeasurable waste of radio resources; Since the query bit Q is added in the RLC PDU header, the status report can be fed back only after the relevant RLC PDU is processed in the RLC layer of the receiving end, for example, after the reordering process. This can lead to large delays, which can result in errors on the sender side ^; false retransmissions. Summary of the invention

In order to overcome the above drawbacks of the prior art, the present invention has been made. Accordingly, an object of the present invention is to provide a method, a communication system, and a transmitting device that implement query processing for a data packet, which can implement a packet for a packet by reserving a query request bit at a MAC (Media Access Control) layer The query processing saves packet space, radio resources and does not require the participation of the RLC (Radio Link Control) layer at the receiving end.

In order to achieve the above object, according to the present invention, a method of implementing query processing for a data packet in a communication system is proposed. At the transmitting end, the method includes the steps of: transmitting, from the radio link control RLC layer to the media access control MAC layer, each RLC layer data packet, and query request information indicating a query request status of each RLC layer data packet, at the MAC layer Receiving each RLC layer data packet from the RLC layer and the query request information, combining the received RLC layer data packets to generate a MAC layer data packet, and setting MAC layer data according to the query request information. The packet header queries the request bit, and transmits the MAC layer data packet to the receiving end. At the receiving end, the method includes the steps of: receiving, at the MAC layer, the MAC layer data packet from the transmitting end, and determining, according to the received query request bit of the MAC layer data packet header, whether to return to the transmitting end The query response of the query request.

Preferably, the method further comprises the step of: recording, at the MAC layer of the transmitting end, information about which RLC layer data packets have requested the query according to the query request information.

Preferably, after the receiving end returns a query response to the query request to the sending end, at the sending end, the method further includes the steps of: at the MAC layer, receiving a query response from the receiving end, and according to the recorded Regarding which RLC layer data packets request the information of the query, the query response is distributed to the corresponding RLC layer entity. '

Preferably, the query request information includes a query request of each RLC layer data packet and a logical channel indication of the RLC layer data packet requesting the query.

Preferably, the method further comprises the steps of: if, at the receiving end MAC layer, the received query request bit of the MAC layer data packet header indicates that the query request exists, returning to the sending end for the query request Query response; otherwise, the query response is not sent.

Preferably, the method further comprises the step of: if the MAC layer at the transmitting end, the query request information refers to If the at least one RLC data packet requests the query, the query request bit of the MAC layer data packet header is set to indicate that the query request exists; otherwise, if the query request information indicates that no RLC data packet requests the query, then setting The query request bit of the MAC layer packet header indicates that there is no query request.

Preferably, the query bit is one bit.

Preferably, the method further comprises the step of: at the RLC layer of the transmitting end, requesting a query for the RLC layer data packet if the RLC layer data packet is a single data packet or a last data packet.

Preferably, the delivery of MAC layer data packets between the transmitting end and the receiving end is implemented by a physical layer.

In addition, according to the present invention, a communication system for implementing query processing for a data packet is also provided, including: a transmitting end device, transmitting each RLC layer data packet from a radio link control RLC layer to a medium access control MAC layer, And query request information indicating a query request status of each RLC layer data packet, at the MAC layer, receiving each RLC layer data packet from the RLC layer and the query request information, and combining the received RLC layer data packets to Generating a MAC layer data packet, and setting a query request bit of the MAC layer data packet header according to the query request information, and transmitting the MAC layer data packet to the receiving end device; and receiving the device at the MAC layer, receiving the And sending, by the sender device, the MAC layer data packet, and determining, according to the received query request bit of the MAC layer data packet header, whether to send a query response to the query request to the sending end device.

Preferably, the transmitting device includes: a first input device, receiving a data packet from a higher layer, and receiving a query response from a MAC layer; and a first control device, generating an RLC layer according to the received data packet from a higher layer a data packet, and generating query request information indicating a status of the query request of each RI layer data packet; the first output device: transmitting the respective RLC layer data packet and the query request information to the MAC layer; the second input device, receiving Each RLC layer data packet from the RLC layer and the query request information, and receiving a query response from the MAC layer of the receiving end and transmitting the same to the distributing device; the second control device: performing the received RLC layer data packet Merging to generate a MAC layer data packet, recording query request information, and setting a query request bit of the MAC layer packet header according to the query request information, and transmitting the MAC layer data packet to the second output device; a second output device, transmitting, by the physical layer, the MAC layer data packet received from the second control device to the receiving device; And the distributing device, according to the recorded query request information, transmitting the query response received from the receiving device to the corresponding RLC layer entity.

Preferably, the first input device, the first control device and the first output device are RLC layer devices, and the second input device, the second control device, the second output device and the distribution device are MAC layer devices. Preferably, the receiving end device comprises: a third input device, receiving the MAC layer data packet from the transmitting end device, and transmitting the data packet to the control device; and the third control device, according to the received MAC layer data packet header Query request bit to determine whether to return a query response to the query request to the sender; and a third output device, transmitting the query response according to the instruction of the control device, and transmitting the MAC layer data packet to the upper layer Process it.

Preferably, the third input device, the third control device, and the third output device are MAC layer devices. According to the present invention, there is also provided a transmitting device in a communication system for performing query processing on a data packet, the transmitting device comprising: a first input device, receiving a data packet from a higher layer, and receiving a media access Controlling a query response of the MAC layer; the first control device generates a radio link control RLC layer data packet according to the received data packet from the upper layer, and generates query request information indicating a query request status of each RLC layer data packet a first output device: transmitting each RLC layer data packet and the query request information to a MAC layer; a second input device, receiving each RLC layer data packet from the RLC layer and the query request information, and receiving from the receiving end The query response of the MAC layer is transmitted to the distribution device; the second control device: combines the received RLC layer data packets to generate a MAC layer data packet, records the query request information, and according to the query request information Setting a query request bit of a MAC layer packet header, and transmitting the MAC layer packet a second output device, the second output device transmitting, by the physical layer, the MAC layer data packet received from the second control device to the receiving device; and the distributing device receiving the information from the receiving device according to the recorded query request information The query response is transmitted to the corresponding RLC layer entity. DRAWINGS

The above objects, advantages and features of the present invention will become apparent from the Detailed Description of the <RTIgt 2 is a schematic diagram of a query process for a single data packet or a last data packet in accordance with the present invention;

3 is a flow chart showing the processing of data transmission at the transmitting end according to the method of the present invention;

4 is a flow chart of processing at the receiving end of the method according to the present invention;

5 is a process flow diagram of a query response at the transmitting end of the method according to the present invention;

Figure 6 is a block diagram of an RLC layer device at the transmitting end of a communication system in accordance with the present invention; Figure 7 is a block diagram of a MAC layer device at the transmitting end of a communication system in accordance with the present invention; and Figure 8 is a block diagram of a MAC layer device at the receiving end of the communication system in accordance with the present invention. detailed description

Preferred embodiments of the present invention will now be described with reference to the accompanying drawings.

2 is a schematic diagram of a query process for a single data packet or a last data packet in accordance with the present invention.

As shown in FIG. 2, only one query bit is reserved in the MAC PDU as a query request indication, and no bits are reserved in the RLC PDU header. At the transmitting end, if at least one RLC PDU needs to be queried, the reserved query bit Q (e.g., Q = l) is set in the MAC PDU for the query. Otherwise, if no RLC PDUs need to be queried, the query bit Q is set for the state of the no query (eg, Q=0). In addition, the sender MAC layer records which RLC PDUs require a query.

At the receiving end, the MAC PDU processing is processed. If the query bit Q of the received MAC layer data packet indicates that at least one RLC PDU needs to be queried (for example, Q = l), the corresponding MAC layer status report is immediately fed back to the transmitting end, that is, the MAC layer data packet is indicated. Whether the report has been received correctly. At the sender, a status report of the feedback is received. The sender MAC layer then distributes the status report to the associated RLC entity based on the previous record to confirm the previous transmission by the query. According to the present invention, the status report from the receiving end MAC layer replaces the status report of the RLC layer from the receiving end in the conventional art.

3 is a process flow diagram of data transmission at the transmitting end in accordance with the method of the present invention.

As shown in FIG. 3, first, the data packet from the upper layer is received at the RLC layer, and it is determined whether the data packet is a single data packet or a last data packet (step 301). If the data packet is a single data packet or a last data packet, at the RLC layer, the data packet is transmitted to the MAC layer through the inter-layer primitive, and the query request information is transmitted through the inter-layer primitive (step 303). . The query request information includes a query request and a logical channel indication of the data packet (data source) (of course, may be other indication information). Otherwise, the packet is transmitted directly to the MAC layer (step 305).

At the MAC layer, data packets from the RLC layer are received and combined to generate a MAC layer data packet (step 307). It is judged based on the inquiry request information whether at least one RLC packet requests the inquiry (step 309). If it is determined that at least one RLC packet requests the query, the MAC layer sets the query request bit located in the MAC packet header as the query request indication, and records which RLC layer packets request the query (step 311). Otherwise, if there is no RLC packet request query, the MAC layer sets the query in the MAC packet header. The request is a no query request (step 313). Then, the data packet is transmitted to the physical layer at the MAC layer to transmit the data packet to the receiving end (step 315).

4 is a flow diagram of the processing at the receiving end of the method in accordance with the present invention.

As shown in FIG. 4, the MAC layer of the receiving end receives the MAC data packet from the physical layer (step 401). Then, at the MAC layer, the query request bit of the received packet header indicates whether there is a query request (step 403). If the query request bit of the packet header indicates that there is a query request, the receiving MAC layer sends a corresponding query response to the transmitting end (step 405). Otherwise, the query response is not sent (step 407).

Figure 5 is a process flow diagram of a query response at the transmitting end of the method in accordance with the present invention.

As shown in FIG. 5, at the MAC layer of the transmitting end, a query response fed back from the receiving end is received (step 501). Then, based on the recorded logical channel indication for querying the RLC packet, the sender MAC distributes the query response to the corresponding RLC layer entity (step 503).

Figure 6 is a block diagram of an RLC layer device at the transmitting end of a communication system in accordance with the present invention.

As shown in Fig. 6, the RLC layer device at the transmitting end of the communication system according to the present invention comprises: an input device 601, a control device 603, and an output device 605. The input device 601 receives the data packet from the upper layer and receives the query response fed back from the MAC layer of the receiving end to finally complete the transmission of the data packet. The control device 603 generates an RLC layer data packet according to the received data packet from the upper layer, and generates a query request information to indicate each of the data packets according to characteristics of the high-level data packet, if it is a single data packet or a last data packet. The query request status of the RLC layer packet. Output device 605 transmits the various RLC layer packets and associated query request information to the MAC layer.

Figure 7 is a block diagram of a MAC layer device at the transmitting end of a communication system in accordance with the present invention.

As shown in FIG. 7, the MAC layer device at the transmitting end of the communication system according to the present invention includes an input device 701, a control device 703, an output device 705, and a distribution device 707. The input device 701 receives the RLC layer data packet from the RLC layer and the corresponding query request information, receives the query response from the receiving MAC layer, and transmits it to the distribution device 707. The control device 703 combines the received RLC layer data packets to generate corresponding MAC layer data packets. If it is determined according to the query request information that at least one RLC layer data packet needs to be queried, setting a query request bit located in the MAC data packet header as a query request indication, and recording which RLC layer data packets need a query request, otherwise, the query request is The bit is set to no query request indication and the MAC packet is transmitted to output device 705. The output device 705 transmits the MAC layer data packet received from the control device 703 to the physical layer for further transmission to the receiving end. The distribution device 707 transmits the query response fed back from the receiving end to the corresponding RLC entity according to the recorded query request information. Figure 8 is a block diagram of a MAC layer device at the receiving end of a communication system in accordance with the present invention.

As shown in Fig. 8, the MAC layer device at the receiving end of the communication system according to the present invention includes: an input device 801, a control device 803, and an output device 805. The input device 801 receives the MAC layer packet from the transmitting device and transmits it to the control device 803. The control device 803 parses the received data packet, and if the query request bit of the data packet header is set to the query request indication (ie, the query is requested), the output device 805 is instructed to feed back the query response, otherwise, the output device 805 is not instructed. Feedback query response. The output device 805 feeds back the query response to the sender according to the indication of the control device, and transmits the data packet to the upper layer for further processing.

According to the present invention, only one query request bit (which can be a bit) is reserved in the MAC layer header, which saves packet space. In addition, since only one query request response information is transmitted through the air interface, wireless resources are saved. In addition, since the transmission response information is transmitted by the receiving MAC layer without the participation of the receiving end RLC layer, the response to the query request is more timely.

While the invention has been described in terms of the preferred embodiments of the present invention, it will be understood that various modifications, changes and changes may be made to the inventions without departing from the spirit and scope of the invention. Therefore, the present invention should not be limited by the foregoing embodiments, but by the appended claims and their equivalents.

Claims

A method for implementing query processing for a data packet in a communication system. At the transmitting end, the method includes the steps of:

Transmitting from the radio link control RLC layer to the media access control MAC layer, each RLC layer data packet, and query request information indicating the query request status of each RLC layer data packet,

At the MAC layer, receiving each RLC layer data packet from the RLC layer and the query request information, and combining the received RLC layer data packets to generate a MAC layer data packet, and according to the query request information. Setting a query request bit of the MAC layer packet header, and transmitting the MAC layer packet to the receiving end; at the receiving end, the method includes the steps of:

Receiving, at the MAC layer, the MAC layer data packet from the sending end, and determining, according to the received query request bit of the MAC layer data packet header, whether to return a query response to the query request to the sending end. .

The method according to claim 1, characterized by further comprising the step of: recording, at the MAC layer of the transmitting end, information on which RLC layer data packets have requested the query based on the query request information.

3. The method according to claim 2, wherein after the receiving end returns a query response to the query request to the transmitting end,

At the transmitting end, the method further includes the steps of:

At the MAC layer, a query response from the receiving end is received, and based on the recorded information about which RLC layer data packets are requested for the query, the query response is distributed to the corresponding RLC layer entity.

4. The method according to claim 1, wherein: the query request information comprises a query request of each RLC layer data packet and a logical channel indication of an RLC layer data packet requesting the query.

5. The method according to claim 1, further comprising the steps of: if: at the receiving end MAC layer, the received query request bit of the MAC layer data packet header indicates that the query request exists, then The sender returns a query response for the query request; otherwise, the query response is not sent.

6. The method according to claim 1, further comprising the step of: if the query request information indicates that at least one RLC data packet requests the query at the MAC layer of the transmitting end, setting the MAC layer data packet header The request bit is requested to indicate the presence of the query request; otherwise, if the query request information indicates that no RLC data packet has requested the query, then the query request bit of the MAC layer packet header is set to indicate no query request.

7. The method according to claim 1, wherein: the query bit is one bit.

The method according to claim 1, further comprising the step of: requesting, at the RLC layer of the transmitting end, the RLC layer data packet if the RLC layer data packet is a single data packet or a last data packet. Inquiry.

9. The method according to claim 1, wherein: the delivery of MAC layer data packets between the transmitting end and the receiving end is implemented by a physical layer.

10. A communication system that implements query processing for a data packet, comprising:

The transmitting end device transmits, from the radio link control RLC layer to the medium access control MAC layer, each RLC layer data packet, and query request information indicating a query request status of each RLC layer data packet, at the MAC layer, receiving from the RLC layer Each RLC layer data packet and the query request information, merge the received RLC layer data packets to generate a MAC layer data packet, and set a query request of the MAC layer data packet header according to the query request information. Bit, and transmitting the MAC layer data packet to the receiving device;

The receiving end device, at the MAC layer, receives the MAC layer data packet from the sending end device, and determines, according to the received query request bit of the MAC layer data packet header, whether to return the query request to the sending end device. Query response.

11. The communication system according to claim 10, wherein said transmitting device comprises: - a first input means for receiving a data packet from a higher layer, and receiving a query response from the MAC layer; the first control means, receiving according to a data packet from a higher layer, generating an RLC layer data packet, and generating query request information indicating a status of a query request of each RLC layer data packet;

a first output device: transmitting each RLC layer data packet and the query request information to a MAC layer; a second input device, receiving each RLC layer data packet from the RLC layer and the query request information, and receiving from receiving The query response of the MAC layer of the end and transmits it to the distribution device;

a second control device: combining the received RLC layer data packets to generate a MAC layer data packet, recording query request information, and setting a query request bit of the MAC layer data packet header according to the query request information, and Transmitting the MAC layer data packet to a second output device;

a second output device, transmitting, by the physical layer, the MAC layer data packet received from the second control device to the receiving device;

The distributing device transmits the query response received from the receiving device to the corresponding RLC layer entity according to the recorded query request information.

12. The communication system of claim 11 wherein said first input device, A control device and a first output device are RLC layer devices, and the second input device, the second control device, the second output device, and the distribution device are MAC layer devices.

13. The communication system according to claim 10, wherein said receiving end device comprises: a third input means for receiving said MAC layer data packet from said transmitting end device and transmitting to said control means;

And the third control device determines, according to the received query request bit of the MAC layer data packet header, whether to return a query response for the query request to the sending end;

And a third output device, transmitting the query response according to an instruction of the control device, and transmitting the MAC layer data packet to a higher layer for processing.

14. The communication system according to claim 13, wherein said third input means, third control means and third output means are MAC layer means.

15. A transmitting device in a communication system that implements query processing for a data packet, the transmitting device comprising:

a first input device, receiving a data packet from a higher layer, and receiving a query response from a media access control MAC layer;

The first control device generates a radio link control RLC layer data packet according to the received data packet from the upper layer, and generates query request information indicating a query request status of each RLC layer data packet;

a first output device: transmitting each RLC layer data packet and the query request information to a MAC layer; a second input device, receiving each RLC layer data packet from the RLC layer and the query request information, and receiving from the receiving end The query response of the MAC layer and transmits it to the distribution device;