CN101340269B - Data transmission method, system and transmitting terminal - Google Patents
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- CN101340269B CN101340269B CN2007101185043A CN200710118504A CN101340269B CN 101340269 B CN101340269 B CN 101340269B CN 2007101185043 A CN2007101185043 A CN 2007101185043A CN 200710118504 A CN200710118504 A CN 200710118504A CN 101340269 B CN101340269 B CN 101340269B
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Abstract
The embodiment of the invention discloses a method for transmitting data, which comprises the following steps: when a sending end schedules data packets for a receiver again, if the last sent data packet is determined to be discarded when former data packets is scheduled, the maximum value of sending sequence numbers TSN corresponding to the non-discarded data packets before the last data packet is further determined when the former data packets is scheduled, TSN is set for the data packets that are scheduled again, which starts from the number adding 1 to the maximum value. The embodiment ofthe invention also discloses a data transmission system and the sending end, and the sending end comprises a sending end MAC layer processing unit and a sending end RLC layer processing unit. By adopting the method, the system and the sending end disclosed by the embodiment of the invention, the time delay of data transformation can be reduced.
Description
Technical Field
The present invention relates to an automatic retransmission technology in wireless communication, and in particular, to a data transmission method, system, and transmitting end.
Background
In a multi-process fast Hybrid Automatic Repeat reQuest (HARQ) system, a Media Access Control (MAC) layer at a transmitting end sets a Transmission Sequence Number (TSN) for a packet transmitted on each process to be used as a sequential recovery of the received packet by a MAC layer at a receiving end. The receiving end MAC layer receives the data packets from the transmitting end MAC layer, reorders the received data packets, and submits the ordered data packets to a receiving end Radio Link Control (RLC) layer in sequence.
Fig. 1 is a schematic diagram of a data transmission process in the prior art, in the data transmission process, the maximum retransmission times are set to 2 times, that is, when a sending-end MAC layer determines that a certain data packet needs to be retransmitted according to an acknowledgement message from a receiving-end MAC layer, the data packet can only be retransmitted twice at most. Meanwhile, the process also assumes that all data packets sent by the sending-end MAC layer to the receiving-end MAC layer before the data packet with TSN 12 are correctly received by the receiving-end MAC layer and are already submitted to the receiving-end RLC layer by the receiving-end MAC layer. When the sending-end MAC layer determines that the receiving-end MAC layer does not correctly receive the data packet with the TSN being 12 according to a Negative Acknowledgement (NACK) message from the receiving-end MAC layer, the sending-end MAC layer retransmits the data packet with the TSN being 12 to the receiving-end MAC layer, and after two retransmissions, the data packet with the TSN being 12 is still not correctly received by the receiving-end MAC layer. At this point, the transmitting MAC layer stops scheduling new packets for the user and discards packets with TSN 12.
When the channel quality of a user improves, a scheduler of a sending end MAC layer schedules a new packet for the user again, according to a transmission mechanism in the prior art, the sending end MAC layer adds 1 to the highest TSN used when the serial number of the packet is set as a previously scheduled packet, that is, 12+1 equals 13, in this case, if a receiving end correctly receives the packet with TSN equal to 13, but the receiving end does not receive the packet with TSN equal to 12, the receiving end stores the packet with TSN equal to 13 into a buffer, and waits for the packet with TSN equal to 12 to arrive, but the packet with TSN equal to 12 is discarded by the sending end. Therefore, the MAC layer of the receiving end needs to wait until the set waiting time is reached, and then submit the data packet with TSN 13 to the RLC layer.
After receiving the data packet with TSN 13, the RLC layer parses the data packet, and determines whether the currently received data is continuous with the received data according to the parsed data, that is, whether unreceived data exists between the currently received data and the received data, if so, the receiving-end RLC layer initiates an RLC layer retransmission request for unreceived data to the sending-end RLC layer, and acquires the unreceived data through an RLC layer retransmission process.
As can be seen from the above description, in the prior art, each time the MAC layer at the transmitting end reschedules a packet for a user, the TSN is set for the rescheduled packet from the highest TSN +1 used by the previously scheduled packet. Therefore, if the last data packet or the last several consecutive data packets are discarded when the data packet is scheduled previously, when the receiving end MAC layer receives the data packet from the sending end MAC layer, it is found that the TSN of the data packet is not consecutive to the TSN of the data packet that has been correctly received by itself, so that the receiving end MAC layer needs to wait for one or more times of the set waiting time before submitting the received data packet to the receiving end RLC layer, thereby delaying the time when the receiving end RLC layer knows that the data is not received, so that the receiving end RLC layer obtains the time delay of the data that is not received through the RLC layer retransmission process, thereby causing a large data transmission delay.
Disclosure of Invention
In view of this, embodiments of the present invention provide a data transmission method, and provide a data transmission system and a transmitting end, so as to reduce a delay of data transmission.
The data transmission method provided by the embodiment of the invention comprises the following steps:
when the sending end dispatches the data packet for the receiving end again, if the sending end determines that the last data packet sent is abandoned when the sending end dispatches the data packet before, the sending sequence number TSN corresponding to the data packet which is not abandoned before from the last data packet is further determined when the sending end dispatches the data packet before, and the TSN is set for the data packet which is rescheduled after the maximum value plus 1.
The data transmission system provided by the embodiment of the invention comprises:
the sending end is used for judging whether the last data packet sent by the previous scheduling data packet is discarded or not when determining to schedule the data packet for the receiving end again, setting TSN for the rescheduled data packet from the maximum value plus 1 when determining to schedule the data packet before, and sending the rescheduled data packet to the receiving end;
the receiving end is used for receiving the data packet from the sending end, sending confirmation information to the sending end according to whether the data packet is correctly received or not, reordering according to the TSN of the correctly received data packet, analyzing the reordered data packet, determining the incorrectly received data according to an analysis result, and sending an RLC layer retransmission request of the incorrectly received data to the sending end.
The sending end provided by the embodiment of the invention comprises:
the sending end MAC layer processing unit is used for judging whether the last data packet sent by the previous scheduling data packet is discarded or not when determining to reschedule the data packet for the receiving end, setting TSN for the rescheduled data packet from the maximum value plus 1 when determining to discard the previous scheduling data packet;
and the sending end RLC layer processing unit is used for receiving the RLC layer retransmission request from the receiving end and initiating an RLC layer retransmission process according to the RLC layer retransmission request.
In the embodiment of the invention, when the sending end schedules the data packet for the receiving end again, if the last data packet sent by the previously scheduled data packet is determined to be discarded, the maximum value of the sending sequence number TSN corresponding to the data packet which is not discarded before the last data packet is further determined when the previously scheduled data packet is scheduled, and the TSN is set for the rescheduled data packet from the maximum value plus 1, so that the transmission delay caused by the fact that the TSN of the data packet received by the receiving end from the sending end is discontinuous with the TSN of the data packet received by the receiving end in the prior art is avoided. Specifically, the method provided by the embodiment of the invention can ensure that the receiving end MAC layer submits the received data packet to the receiving end RLC layer without time delay, so that the receiving end RLC layer can determine the data which is not correctly received as soon as possible and initiate an RLC layer retransmission request to the transmitting end RLC layer.
Drawings
FIG. 1 is a schematic diagram of a prior art data transmission process;
FIG. 2 is a flow chart of an embodiment of a data transmission method of the present invention;
FIG. 3 is a schematic diagram illustrating a process of implementing data transmission by using the method shown in FIG. 2;
FIG. 4 is a schematic diagram of a data transmission system according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a packet status maintenance unit in the system shown in fig. 4.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the following embodiments and the accompanying drawings.
In the embodiment of the invention, when the sending end schedules the data packet for the receiving end again, if the last data packet sent is discarded when the data packet is scheduled before is determined, the maximum value of the sending sequence number TSN corresponding to the data packet which is not discarded before from the last data packet is further determined when the data packet is scheduled before, and the TSN is set for the data packet which is scheduled again by adding 1 to the maximum value.
The method may further comprise:
the sending end maintains a state parameter for each data packet sent to the receiving end, and when the data packet is determined to be discarded, the state parameter of the data packet is set to be discarded. In this case, the transmitting end may determine whether the transmitted data packet was discarded when the data packet was previously scheduled, based on the status parameter maintained for each transmitted data packet.
Here, the status parameter maintained for the packet may be represented by a boolean value, such as 1 indicating that the packet is discarded and 0 indicating that the packet is not discarded.
When a sending end schedules a data packet before, only the last sent data packet is discarded, and when the sending end schedules the data packet before, the maximum value of the TSN corresponding to the data packet which is not discarded plus 1 is equal to the TSN corresponding to the last sent data packet.
When a sending end schedules a data packet before, a plurality of data packets which are sent continuously are discarded, and when the sending end schedules the data packet before, the maximum value plus 1 of the TSNs corresponding to the data packets which are not discarded is equal to the minimum value of the TSNs corresponding to the discarded last plurality of data packets which are sent continuously.
Fig. 2 is a schematic diagram of an embodiment of a data transmission method according to the present invention. In this embodiment, the data packets before the data packet with TSN being TSN1 are all correctly received by the MAC layer of the receiving end, and the maximum retransmission times set by the MAC layer retransmission mechanism is two times.
In step 201, the transmitting MAC layer sends a packet with TSN of TSN1 to the receiving MAC layer.
Here, the negative acknowledgement message indicates that the receiving MAC layer has not correctly received the packet with TSN 1.
In step 204, the transmitting MAC layer retransmits the data packet with TSN1 to the receiving MAC layer again.
In step 206, the sender MAC layer stops scheduling packets for the receiver and discards packets with TSN of TSN1, and then performs step 208.
It should be noted that, when the sending-end MAC layer receives consecutive negative acknowledgement messages from the receiving-end MAC layer, it usually stops scheduling data packets for the receiving-end MAC layer, because a scheduler in the sending-end MAC layer for scheduling data packet transmission of each process is a non-blind scheduler, and when the sending-end MAC layer retransmits a data packet with TSN being TSN1 twice and the receiving-end MAC layer does not receive the data packet correctly, the sending-end MAC layer determines that the channel quality at the current receiving end is degraded, and stops scheduling data packets for the receiving-end MAC layer.
Certainly, the maximum retransmission times of the retransmission mechanism of the MAC layer at the transmitting end is not necessarily two times, and may be determined according to actual needs. The condition that the MAC layer of the transmitting end determines whether the channel quality of the channel where the receiving end is currently located is deteriorated may also be determined according to actual needs.
In step 207, the sending-end MAC layer continues to send the next data packet to the receiving-end MAC layer.
And step 208, when the sending end determines that the channel quality of the channel where the receiving end is located is recovered to be normal, the MAC layer of the sending end dispatches the data packet for the receiving end again.
Here, the method for determining that the channel quality of the channel where the receiving end is located is recovered to be normal by the sending end is the prior art, and is not described in detail.
When receiving the TSN from the transmitting end from the TSN1, the MAC layer at the receiving end determines the TSN continuous with the data packet submitted to the RLC layer, and then directly carries out reordering on the received data packet and submits the reordered data packet to the RLC layer in sequence. The RLC layer receives and analyzes the data packets, and determines that data which are not correctly received still exist between the data packets and the received TSN1-1 data packet according to an analysis result, namely the data carried in the original TSN1 data packet discarded by the MAC layer of the sending end when the data packets are scheduled before, so that the RLC layer can immediately initiate RLC layer retransmission to the sending end and request the RLC layer of the sending end to retransmit the data into the received data.
If the last several consecutive TSNs sent are discarded when the sending-end MAC layer schedules the data packet before, the sending-end MAC layer needs to determine the maximum TSN corresponding to the data packet that is not discarded when the sending-end MAC layer schedules the data packet before, and sets the TSN for the rescheduled data packet starting by adding 1 to the maximum TSN.
A specific application scenario: assuming that the last two transmitted packets are discarded when the sender MAC layer schedules the packets before, and the TSNs of the two packets are TSN1 and TSN1-1, respectively, then the sender MAC layer determines to schedule the packets for the receiver again, which includes the following steps:
when the sender MAC layer first determines that a previously scheduled packet is a last transmitted packet, that is, a packet with TSN equal to TSN1 is discarded, and when it is determined that the packet is discarded, it further determines whether a packet with TSN equal to TSN1-1 is discarded, and when it is determined that a packet with TSN equal to TSN1-1 is also discarded, it further determines whether a packet with TSN equal to TSN1-2 is discarded, and when it is determined that a packet with TSN equal to TSN1-2 is not discarded, the maximum value of the packets that are not discarded is TSN1-2, and when it is determined that a previously scheduled packet is not discarded, a TSN is set for the newly scheduled packet from TSN 1-1.
If three or more continuous data packets sent last are continuously discarded by the sending end MAC layer when the data packets are scheduled before, the sending end MAC layer sequentially judges whether each sent data packet is discarded from the last sent data packet to the front when determining to schedule the data packets for the receiving end again until finding a data packet which is not discarded, and sets TSN for the rescheduled data packet from TSN +1 corresponding to the data packet which is not discarded.
As can be seen from the above description, in the data transmission method provided in the embodiment of the present invention, when the sending end reschedules the receiving end with the data packet, in order to enable the receiving end MAC layer to receive the data packet with consecutive TSNs, the TSNs of the data packets discarded when the data packet is scheduled before are reassigned to the rescheduled data packet, so that the receiving end MAC layer can submit the received data packet to the receiving end RLC layer without delay. Meanwhile, the receiving end RLC layer judges whether the data which is not received exists or not by analyzing the data carried by the received data packet, so that the method provided by the embodiment of the invention does not influence the data processing process of the receiving end RLC layer, and can enable the receiving end RLC layer to acquire the data which is not received as soon as possible, and further initiate the RLC layer retransmission process to the transmitting end RLC layer.
Fig. 3 is a schematic diagram of a process of implementing data transmission by using the method shown in fig. 2, where it is assumed that TSN1 is 12, and before a data packet with TSN 12, data packets sent by a sending end to a receiving end are all correctly received by the receiving end, and the maximum retransmission time of the sending end is 2 times. As shown in fig. 3, after the transmitting-side MAC layer transmits a data packet with TSN of 12 to the receiving-side MAC layer for the first time, and receives a NACK message from the receiving-side MAC layer, the transmitting-side MAC layer retransmits the data packet with TSN of 12 to the receiving-side MAC layer for the first time, and if the transmitting-side MAC layer receives the NACK message transmitted by the receiving-side MAC layer again, the transmitting-side MAC layer retransmits the data packet with TSN of 12 to the receiving-side MAC layer for the second time, and then the transmitting-side MAC layer receives the NACK message transmitted by the receiving-side MAC layer again, in which case, the transmitting side stops scheduling the data packet for the receiving side.
When the sending end determines that the channel quality of the channel where the receiving end is located is recovered to be normal, the sending end schedules the data packet for the receiving end again, and when the sending end MAC determines that the data packet is scheduled before, the last sent data packet, namely the data packet with the TSN being 12, is discarded, and the data packets before the data packet are all received by the receiving end correctly, so the TSN is set for the data packet which is scheduled again from 12. Thus, after receiving the data packet from TSN 12, the MAC layer at the receiving end reorders the received data packet according to the descending order of TSN, and directly submits the reordered data packet to the RLC layer at the receiving end for processing.
To implement the data transmission method provided in the embodiment shown in fig. 1, the sending end may maintain a status parameter for each data packet to be sent, which indicates whether the data packet is discarded. The status parameter may be identified by a boolean value. When a packet is dropped, setting the corresponding boolean value to 1; otherwise, it is set to 0. The specific implementation mode can be as follows: when a sending end sends a certain data packet for the first time, the Boolean value of the state parameter corresponding to the data packet is set to be 0, and when the MAC layer of the sending end determines that the data packet is retransmitted for the set maximum retransmission times and is still not correctly received by the MAC layer of the receiving end, the MAC layer of the sending end sets the Boolean value of the state parameter corresponding to the data packet to be 1.
When the sending end determines that the data packet is scheduled for the receiving end again after judging that the channel quality of the channel where the receiving end is located is recovered, whether the corresponding data packet is discarded or not can be judged according to the state parameters of each data packet when the data packet is scheduled before, and then the maximum value of the TSN corresponding to the data packet which is not discarded when the data packet is scheduled before is determined. It should be particularly noted that, the data transmission method provided by the embodiment of the present invention must satisfy the following conditions: when the sender schedules a data packet before, the last data packet or a plurality of continuous data packets is discarded.
The embodiment of the invention also provides a data transmission system, which comprises: a transmitting end and a receiving end. Wherein,
the sending end is used for determining whether the last sent data packet is discarded or not when the data packet is rescheduled for the receiving end and the previous data packet is scheduled, and when the previous data packet is determined to be discarded, setting TSN for the rescheduled data packet from the maximum value plus 1 according to the maximum value of the sending sequence number TSN corresponding to the data packet which is not discarded before the last data packet, and sending the rescheduled data packet to the receiving end;
and the receiving end is used for receiving the data packet from the sending end, reordering according to the TSN of the received data packet, analyzing the reordered data packet, determining the incorrectly received data packet according to the analysis result, and initiating an RLC layer retransmission request of the incorrectly received data packet to the sending end.
The transmitting end in the system comprises: a sending end MAC layer processing unit and a sending end Radio Link Control (RLC) layer processing unit. The receiving end includes: a receiving end MAC layer processing unit and a receiving end RLC layer processing unit.
The sending end MAC layer processing unit is used for judging whether the sent last data packet is discarded or not when determining to schedule the data packet for the receiving end again and judging whether the data packet is scheduled before, and when determining to schedule the data packet before being discarded, setting TSN for the data packet to be rescheduled from the maximum value plus 1 and sending the data packet to be rescheduled to the receiving end, wherein the sending end MAC layer processing unit is used for determining whether the sent last data packet is discarded or not;
and the sending end RLC layer processing unit is used for receiving the RLC layer retransmission request from the receiving end and initiating an RLC layer retransmission process according to the RLC layer retransmission request.
The RLC layer retransmission process described herein is prior art and is not described in detail.
The receiving end MAC layer processing unit is used for receiving the data packets from the transmitting end, reordering according to the TSN of the received data packets and submitting the ordered data packets to the receiving end RLC layer processing unit;
and the receiving end RLC layer processing unit is used for analyzing the received data packet, determining the incorrectly received data packet according to the analysis result, and initiating an RLC layer retransmission request of the incorrectly received data packet to the sending end RLC layer processing unit.
As shown in fig. 4, the MAC layer processing unit at the sending end may be composed of a packet sending unit, a packet status maintaining unit, and a packet scheduling unit. Wherein,
the data packet sending unit is used for sending the data packet to the receiving end;
a data packet state maintaining unit, configured to maintain, for each data packet sent by the data packet sending unit, a state parameter that identifies whether the data packet is discarded; determining whether to discard the data packet which is not correctly received by the receiving end, and setting the state parameter of the data packet which is determined to be discarded as discarded;
and the data packet scheduling unit is used for determining whether to stop or not to reschedule the data packet for the receiving end according to the channel quality of the physical channel where the receiving end is located, and when the data packet is determined to be rescheduled for the receiving end again, if the last sent data packet is discarded when the data packet is scheduled previously, the maximum value of the sending sequence number TSN corresponding to the data packet which is not discarded previously from the last data packet is determined according to the state parameter of the sent data packet maintained in the data packet state maintenance unit, and the TSN is set for the rescheduled data packet from the maximum value plus 1.
As shown in fig. 5, the packet status maintenance unit in fig. 4 may be composed of an acknowledgement message receiving unit and a discard determination unit, wherein
An acknowledgement message receiving unit for receiving an acknowledgement message from a receiving end,
a discard determining unit for maintaining a status parameter for each data packet sent by the data packet sending unit, which identifies whether the data packet is discarded or not; determining whether the corresponding data packet is correctly received by the receiving end according to the confirmation message received by the confirmation message receiving unit; and judging whether the number of times that the corresponding data packet is not correctly received by the receiving end is less than the set maximum number of times, if so, instructing the data transmitting unit to retransmit the data packet, otherwise, instructing the data packet transmitting unit to discard the data packet, and setting the state parameter of the data packet to be discarded.
As can be seen from the above description, in the embodiment of the present invention, when a sending end reschedules a data packet for a receiving end, it is first determined whether the last data packet is discarded when the previous data packet is scheduled, and if the last data packet is discarded, it is further determined that the maximum TSN corresponding to the data packet that is not discarded in the previous data packet scheduling process is discarded, and a TSN is set for the rescheduled data packet from the maximum TSN plus 1, so that transmission delay caused by the fact that the TSN of the data packet received by a MAC layer of the receiving end is discontinuous with the TSN of the data packet already received by the receiving end in the prior art is avoided, so that the MAC layer of the receiving end can submit the received data packet to an RLC layer of the receiving end without delay, and the RLC layer of the receiving end can determine data that is not correctly received as soon as possible, and initiate an RLC.
In short, the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A method of data transmission, the method comprising:
when the sending end dispatches the data packet for the receiving end again, if the sending end determines that the last data packet sent is abandoned when the sending end dispatches the data packet before, the sending sequence number TSN corresponding to the data packet which is not abandoned before from the last data packet is further determined when the sending end dispatches the data packet before, and the TSN is set for the data packet which is rescheduled after the maximum value plus 1.
2. The method of claim 1, further comprising:
the sending end maintains a state parameter for each data packet sent to the receiving end, and when the data packet is determined to be discarded, the state parameter of the data packet is set to be discarded;
the sending end determines whether the sent data packet is discarded or not when the data packet is scheduled before according to the state parameter maintained for each sent data packet.
3. The method of claim 2, wherein the state parameter is represented by a boolean value.
4. The method according to any of claims 1 to 3, wherein when the sender schedules packets before, only the last sent packet is discarded, and the maximum value plus 1 equals the TSN corresponding to the last sent packet.
5. The method according to any of claims 1 to 3, wherein when the transmitting end has previously scheduled a data packet, the last consecutively transmitted data packets are discarded, and the maximum value plus 1 equals to the minimum value of the TSNs corresponding to the discarded last consecutively transmitted data packets.
6. A data transmission system, comprising:
the sending end is used for judging whether the last data packet sent by the previous scheduling data packet is discarded or not when determining to schedule the data packet for the receiving end again, setting TSN for the rescheduled data packet from the maximum value plus 1 when determining to schedule the data packet before, and sending the rescheduled data packet to the receiving end;
the receiving end is used for receiving the data packet from the sending end, sending confirmation information to the sending end according to whether the data packet is correctly received or not, reordering according to the TSN of the correctly received data packet, analyzing the reordered data packet, determining the incorrectly received data according to an analysis result, and sending an RLC layer retransmission request of the incorrectly received data to the sending end.
7. The system of claim 6, wherein the receiving end comprises:
the receiving end MAC layer processing unit is used for receiving the data packets from the transmitting end, reordering according to the TSN of the received data packets and submitting the ordered data packets to the receiving end RLC layer processing unit;
the receiving end RLC layer processing unit is used for analyzing the received data packet, determining the incorrectly received data according to the analysis result, and initiating an RLC layer retransmission request of the incorrectly received data to the transmitting end RLC layer processing unit.
8. A transmitting end, comprising:
the sending end MAC layer processing unit is used for judging whether the last data packet sent by the previous scheduling data packet is discarded or not when determining to reschedule the data packet for the receiving end, setting TSN for the rescheduled data packet from the maximum value plus 1 when determining to discard the previous scheduling data packet;
and the sending end RLC layer processing unit is used for receiving the RLC layer retransmission request from the receiving end and initiating an RLC layer retransmission process according to the RLC layer retransmission request.
9. The transmitting end according to claim 8, wherein the transmitting end MAC layer processing unit includes:
the data packet sending unit is used for sending the data packet to the receiving end;
a data packet status maintenance unit, configured to maintain, for each data packet sent by the data packet sending unit, a status parameter that identifies whether the data packet is discarded; determining whether to discard the data packet which is not correctly received by the receiving end, and setting the state parameter of the data packet which is determined to be discarded as discarded;
and the data packet scheduling unit is used for determining whether to stop or not to reschedule the data packet for the receiving end according to the channel quality of the physical channel where the receiving end is located, and when the data packet is determined to be rescheduled for the receiving end again, if the last sent data packet is discarded when the data packet is scheduled previously, setting the TSN for the rescheduled data packet from the maximum value plus 1 corresponding to the sending sequence number TSN of the data packet which is not discarded before starting from the last data packet when the data packet is determined to be scheduled previously according to the state parameter of the sent data packet maintained in the data packet state maintenance unit.
10. The transmitting end of claim 9, wherein the packet status maintenance unit comprises:
an acknowledgement message receiving unit for receiving an acknowledgement message from the receiving end,
a discard determining unit, configured to maintain, for each data packet sent by the data packet sending unit, a status parameter that identifies whether the data packet is discarded; determining whether the corresponding data packet is correctly received by the receiving end according to the confirmation message received by the confirmation message receiving unit; and judging whether the number of times that the corresponding data packet is not correctly received by the receiving end is less than the set maximum number of times, if so, instructing the data transmitting unit to retransmit the data packet, otherwise, instructing the data packet transmitting unit to discard the data packet, and setting the state parameter of the data packet as discarded.
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1663164A (en) * | 2002-05-13 | 2005-08-31 | 高通股份有限公司 | Data delivery in conjunction with a hybrid automatic retransmission mechanism in CDMA communication systems |
| CN1875557A (en) * | 2003-11-10 | 2006-12-06 | Lg电子株式会社 | Updating next-expected TSN and receiver window to avoid stall conditions |
| CN1719762A (en) * | 2004-07-09 | 2006-01-11 | 华为技术有限公司 | Data retransmission method based on high-speed down link data packet access technique |
| CN1734999A (en) * | 2004-08-13 | 2006-02-15 | 北京三星通信技术研究有限公司 | The method of the rearrangement of mixed automatic repeat request |
| EP1770897A1 (en) * | 2005-09-29 | 2007-04-04 | Samsung Electronics Co.,Ltd. | Mobile communications method, apparatus and system for packet retransmission |
Non-Patent Citations (1)
| Title |
|---|
| 付琳,周亮.3GPP HARQ简述.《成都信息工程学院学报》.2002,第17卷(第2期),93-96. * |
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| CN101340269A (en) | 2009-01-07 |
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