Method and apparatus for transmitting data, and communication system

• US 20120063526A1
• Filed: 11/22/2011
• Published: 03/15/2012
• Est. Priority Date: 05/22/2009
• Status: Active Grant

• Current Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Original Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Inventors: XIAO, Ruijie, LEUNG, Matthew
• Granted Patent: US 8,526,513 B2
• Time in Patent Office: Days
• US Class Current: 375/259
• CPC Class Codes: H04L 1/0018 based on latency requirement
• CPC Class Codes: H04L 1/1835 Buffer management
• CPC Class Codes: H04L 1/1854 Scheduling and prioritising arrangements
• CPC Class Codes: H04L 1/1874 Buffer management
• CPC Class Codes: H04L 1/1887 Scheduling and prioritising arrangements
• CPC Class Codes: H04L 47/245 using preemption
• CPC Class Codes: H04L 67/61 taking into account QoS or priority requirements

Abstract

The present invention discloses a method for transmitting data. In the embodiments of the present invention, whether to send blocking information used to block low priority data sent by an upper layer is determined through monitoring a delay of data during transmission, so as to prevent data overflow in a retransmission buffer of the sending end, thus achieving higher INP protection for the low priority data. Meanwhile, only the low priority data is blocked at this time, therefore, a sending end may further continue receiving high priority data, and mark the high priority data with a flag indicating retransmission is not needed when encapsulating the high priority data, so that a receiving end does not apply for retransmission of the high priority data when receiving the high priority data, thus ensuring the short delay requirement of the high priority data.

Claims

1. A method for transmitting data, comprising:

monitoring a delay of data during transmission;

if the delay is greater than a first delay threshold value, sending blocking information, wherein the blocking information is used to block low priority data sent by an upper layer;

receiving high priority data sent by the upper layer;

encapsulating the high priority data into a data unit, and marking the data unit with a flag indicating that retransmission is not needed; and

sending the data unit to a receiving end.

2. The method according to claim 1, wherein

the monitoring the delay of the data during the transmission comprises:

determining whether an amount of data saved in a retransmission buffer of the sending end is greater than a preset threshold value;

if the amount of data saved in the retransmission buffer of the sending end is greater than the preset threshold value, it indicates that the delay is greater than the preset threshold value;

if the amount of data saved in the retransmission buffer of the sending end is not greater than the preset threshold value, it indicates that the delay is not greater than the preset threshold value; and

the marking the data unit with the flag indicating that the retransmission is not needed comprises;

marking the data unit with a service sequence identifier indicating that the retransmission is not needed, or an additional flag indicating that the retransmission is not needed.

3. The method according to claim 1, wherein after the sending the blocking information, the method further comprises:

encapsulating idle data into a data unit, and marking the data unit with a flag indicating that retransmission is not needed.

4. A method for transmitting data, comprising:

receiving a data unit sent by a sending end;

when it is determined that the data unit comprises a flag indicating that retransmission is not needed, saving the data unit in a retransmission buffer of the receiving end;

when it is determined that the data unit does not comprise the flag indicating that the retransmission is not needed, judging whether the data unit is a new data unit;

if the data unit is the new data unit, saving the data unit in the retransmission buffer of the receiving end; and

if the data unit is not the new data unit, judging whether the data unit is incorrect;

if the data unit is incorrect, discarding the data unit;

if the data unit is not incorrect, further judging whether the data unit times out;

if the data unit times out, discarding the data unit; and

if the data unit does not time out, saving the data unit in the retransmission buffer of the receiving end.

5. The method according to claim 4, further comprising:

marking the data unit in the retransmission buffer of the receiving end with an additional flag through monitoring a delay status, wherein the additional flag indicates a processing manner after an upper layer receives the data unit; and

submitting the data unit to the upper layer, so that the upper layer processes the data unit according to the additional flag.

6. The method according to claim 5, wherein the marking the data unit in the retransmission buffer of the receiving end with the additional flag through monitoring the delay status comprises:

judging whether a data unit not corrected within a high-priority-service delay threshold value exists in the receiving end buffer;

if no data unit not corrected within the high-priority-service delay threshold value exists in the receiving end buffer, when it is determined that there is a new data unit needed to be submitted to the upper layer and that the data unit is correct, marking the data unit with an additional flag indicating normality; and

when it is determined that there is a new data unit needed to be submitted to the upper layer and that the data unit is incorrect, marking the data unit with an additional flag indicating that high priority service data is retained and low priority service data is discarded; and

if a data unit not corrected within the high-priority-service delay threshold value exists in the receiving end buffer, in one aspect, when it is determined that there is a new data unit needed to be submitted to the upper layer, marking the data unit with the additional flag indicating that the high priority service data is retained and the low priority service data is discarded; and

in the other aspect, performing judgment on the data unit not corrected within the high priority threshold value, and when it is determined that the data unit not corrected within the high-priority-service delay threshold value needs to be submitted, marking the data unit with an additional flag indicating that the low priority service data is retained and the high priority service data is discarded.

7. The method according to claim 6, wherein the submitting the data unit to the upper layer comprises:

when the data unit in the buffer is marked with the additional flag indicating normality, moving the data unit out of the retransmission buffer of the receiving end and submitting the data unit to the upper layer;

when the data unit in the buffer is marked with the additional flag indicating that the high priority service data is retained and the low priority service data is discarded, copying the data unit and submitting the data unit to the upper layer; and

when the data unit in the buffer is marked with the additional flag indicating that the low priority service data is retained and the high priority service data is discarded, moving the data unit out of the retransmission buffer of the receiving end and submitting the data unit to the upper layer.

8. A sending end device, comprising:

a monitoring unit, configured to monitor a delay of data during transmission;

a blocking information sending unit, configured to send blocking information when the monitoring unit determines that the delay is greater than a first delay threshold value, wherein the blocking information is used to block low priority data sent by an upper layer;

a receiving unit, configured to receive service data sent by the upper layer;

an encapsulation unit, configured to encapsulate data received by the receiving unit into a data unit and mark the data unit with a flag indicating that retransmission is not needed; and

a sending unit, configured to send the data unit encapsulated by the encapsulation unit to a receiving end.

9. The sending end device according to claim 8, further comprising:

an idle data encapsulation unit, configured to encapsulate idle data into a data unit and mark the data unit with the flag indicating that the retransmission is not needed, wherein

the sending unit is further configured to send the data unit encapsulated by the idle data encapsulation unit to the receiving end.

10. A communication system, comprising:

a sending end device, configured to monitor a delay of data during transmission;

if the delay is greater than a first delay threshold value, send blocking information used to block low priority data sent by an upper layer;

receive high priority data sent by the upper layer;

encapsulate the high priority data into a data unit;

mark the data unit with a flag indicating that retransmission is not needed; and

send the data unit to a receiving end device; and

the receiving end device, configured to receive the data unit sent by the sending end device; and

when it is determined that the data unit comprises the flag indicating that the retransmission is not needed, save the data unit in a retransmission buffer of the receiving end.

11. The communication system according to claim 10, wherein

the receiving end device is further configured to mark the data unit in the retransmission buffer of the receiving end with an additional flag through monitoring a delay status, wherein the additional flag indicates a processing manner after the upper layer receives the data unit;

and submit the data unit to the upper layer, so that the upper layer processes the data unit according to the additional flag.