CN104518852A

CN104518852A - Transmission feedback method

Info

Publication number: CN104518852A
Application number: CN201310453287.9A
Authority: CN
Inventors: 王涛; 洪海
Original assignee: Potevio Institute of Technology Co Ltd
Current assignee: Potevio Institute of Technology Co Ltd
Priority date: 2013-09-29
Filing date: 2013-09-29
Publication date: 2015-04-15
Anticipated expiration: 2033-09-29
Also published as: CN104518852B

Abstract

The invention discloses a transmission feedback method. The method comprise: when a receiving end receives data, according to current received protocol data unit conditions, generating a corresponding RLC STATUS PDU data package on the basis of the format of a preset second radio link control state protocol data unit (RLC STATUS PDU), and sending the RLC STATUS PDU data package to a data transmitting end. An E3 domain and an E4 domain are added in the second RLC STATUS PDU format, so as to realize optimized indication for RLC continuous PDU loss and loss of a plurality of segments of a same PDU. Using the method can greatly reduce cost of wireless resources of the RLC STATUS PDU, and improvise transmission efficiency.

Description

A kind of transmission feedback method

Technical field

The present invention relates to mobile communication technology, particularly relate to a kind of transmission feedback method.

Background technology

Current 230MHz frequency range is mainly used in data radio station and bears long-range data collection task, can only be used for some simple communications applications because the speed provided is very low, cannot meet intelligent grid and the growing business demand of Sensor Network.According to the planning in national grid future, require to find a kind of new broadband communications technologies, meet the business demand in its distribution automation, load management, power information collection, smart power grid user service, emergency first-aid repair, the large field of special area video monitoring six.

230MHz frequency range product based on TD-LTE technology is that the demand provides good solution, constitutes low-power consumption of new generation, high spectrum utilization, the multi-business communication system flexibly of high reliability.Farthest can meet the business need of power load monitoring system, simultaneously for the planning of national grid next generation network provides solid technological accumulation and Applied D emonstration.

In current TD-LTE230 wireless broadband access system, data receiver is when feedback data transmission situation, rlc status pdu format unit (the RLC STATUS PDU) transformat defined in employing standard TD-LTE agreement, sends to data sending terminal by relevant information.

Fig. 1 is the RLC STATUS PDU transformat schematic diagram defined in standard TD-LTE agreement.

Wherein, data/control (Data/Control, D/C) territory, length is 1 bit, and being used to indicate wireless spread-spectrum technology-protocol Data Unit (RLC PDU) is wireless spread-spectrum technology-data-protocol Data Unit (RLC data PDU or wireless spread-spectrum technology-control-protocol Data Unit (RLC control PDU).The concrete value in D/C territory is defined as follows shown in table 1.

Thresholding	Indication information
		0	Control PDU
1	Data PDU

Table 1

Control PDU form (Control PDU Type, CPT) territory, length is 3bit, is used to indicate RLC control PDU form.The concrete value in CPT territory is defined as follows shown in table 2.

Table 2

Confirmation sequence number (Acknowledgement SN, ACK_SN) territory, be used to indicate first do not receive and in STATUS PDU, do not report the sequence number (SN) of the RLC Data PDU of loss, length is 10bit.

Unacknowledged information sequence number (Negative Acknowledgement SN, NACK_SN) territory, be used to indicate the acknowledged mode data PDU(AMD PDU that wireless spread-spectrum technology (RLC) entity receiver side under affirmation mode (AM) has detected loss) or the SN of a part of AMD PDU, length is 10bit.

Expansion 1(Extension1bit, E1) territory: whether instruction comprises thereafter one group of NACK_SN territory, E1 territory and E2 territory, length 1bit.The concrete value in E1 territory is defined as follows shown in table 3.

Table 3

Expansion 2(Extension2bit, E2) territory, be used to indicate and whether have thereafter one group of SOstart and SOend territory, length is 1bit.The concrete value in E2 territory is defined as follows shown in table 4.

Thresholding	Indication information
		0	One group of SOstart and SOend territory is not followed after current NACK_SN
1	At current NACK_SN followed by one group of SOstart and SOend territory

Table 4

Lose section initial (Segment Offset start, SOstart) territory, be used to indicate the position of first character joint in AMD PDU data field (calculating by byte) of lost part, length is 15bit.

Lose section and terminate (Segment Offset end, SOend) territory, be used to indicate the position of last byte in AMD PDU data field (calculating by byte) of lost part, length is 15bit.

Above-mentioned employing RLC STATUS PDU transformat indicates the method for transmission situation, is applicable to wireless broadband access system, and when being applied to wireless narrow band access system, then can there are the following problems:

1, need to provide corresponding NACK_SN domain information respectively for each PDU for the multiple PDU lost continuously, like this, when wireless spread-spectrum technology (RLC) layer continual data package dropout, the STATUS PDU of feedback will be comparatively large, thus Radio Resource expense can be caused large.

2, the multiple differences for a PDU lose section, need will distribute for each loss section to provide corresponding NACK_SN domain information, like this, will lose in PDU hop count amount more time, the NACK_SN territory expense repeated is larger, thus the STATUS PDU fed back can be caused comparatively large, Radio Resource expense is large.

In view of 230 systems based on TD-LTE standard need to support that wireless narrow band access is transmitted, being now supplied to each user bandwidth less, in order to adapt to the transmission of little TB block, improving valid data transmission efficiency, need the expense as far as possible reducing RLCSTATUS PDU.Therefore, the above-mentioned RLC STATUS PDU transformat being applicable to wireless broadband access system, due to the existence of the problems referred to above, cannot meet the transmission performance needs of 230 systems.

Summary of the invention

In view of this, main purpose of the present invention is to provide a kind of transmission feedback method, and the method effectively can reduce the expense of RLCSTATUS PDU.

In order to achieve the above object, the technical scheme that the present invention proposes is:

A kind of transmission feedback method, comprising:

After receiving terminal receives data, according to the protocol Data Unit situation be currently received, according to the second rlc status pdu format unit R LC STATUS PDU form preset, generate corresponding RLC STATUSPDU packet;

Wherein, when carrying out described generation, if there is a protocol Data Unit PDU to meet: the data of this PDU are all lost and be there is thereafter the PDU that loss of data occurs at least one, then after the E2 territory that this PDU is corresponding, increase an E3 territory, the PDU that described E3 territory is used to indicate from the PDU sequence number indicated by NACK_SN territory corresponding to this PDU to the PDU sequence number indicated by next NACK_SN territory in scope loses continuously, or is used to indicate the NACK_SN territory that next NACK_SN territory is not used in this PDU of associating corresponding and loses continuously to indicate PDU; If multiple fragment loss of a PDU, after the NACK_SN territory that this PDU is corresponding, then increase SOstart territory and the SOend territory of each segmentation successively, and increase an E4 territory respectively after each SOend territory wherein, SOstart territory and the Soend territory of described E4 territory whether followed by other segmentations of PDU indicated by current NACK_SN territory after being used to indicate this E4 territory;

Described RLC STATUS PDU Packet Generation is given the transmitting terminal of described data by described receiving terminal.

In sum, the transmission feedback method that the present invention proposes, in RLC STATUS PDU packet, introduce E3 territory to indicate the PDU lost continuously, introduce multiple segmentations that E4 territory indicates same PDU to lose, so, significantly can reduce the repetition expense in NACK_SN territory in RLC STATUS PDU packet, realize the optimization instruction of multiple segmentations of losing PDU and same PDU continuously, thus effectively can reduce the expense of RLC STATUS PDU, improve data transmission efficiency.

Accompanying drawing explanation

Fig. 1 is the RLC STATUS PDU transformat schematic diagram defined in standard TD-LTE agreement;

Fig. 2 is the method flow schematic diagram of the embodiment of the present invention one.

Embodiment

For making the object, technical solutions and advantages of the present invention clearly, the present invention is described in further detail below in conjunction with the accompanying drawings and the specific embodiments.

Core concept of the present invention is: increase E3 territory and E4 territory, achieves the optimization instruction of multiple fragment loss of RLC continuous P DU loss and same PDU, to make RLC STATUS PDU as far as possible little, reaches and reduce Radio Resource expense, improve the object of efficiency of transmission.

Fig. 2 is the schematic flow sheet of the embodiment of the present invention one, and as shown in Figure 2, the transmission feedback method of this embodiment mainly comprises the following steps:

Step 201, after receiving terminal receives data, according to the protocol Data Unit situation be currently received, according to the second rlc status pdu format unit (the RLC STATUS PDU) form preset, generate corresponding RLC STATUS PDU packet.

Wherein, when carrying out described generation, if there is a protocol Data Unit PDU to meet: the data of this PDU are all lost and be there is thereafter the PDU that loss of data occurs at least one, then after the E2 territory that this PDU is corresponding, increase an E3 territory, the PDU that described E3 territory is used to indicate from the PDU sequence number indicated by NACK_SN territory corresponding to this PDU to the PDU sequence number indicated by next NACK_SN territory in scope loses continuously, or is used to indicate next NACK_SN territory and is not used in the function that NACK_SN territory instruction PDU corresponding to this PDU of associating lose continuously; If multiple fragment loss of a PDU, after the NACK_SN territory that this PDU is corresponding, then increase SOstart territory and the SOend territory of each segmentation successively, and increase an E4 territory respectively after each SOend territory wherein, SOstart territory and the Soend territory of described E4 territory whether followed by other segmentations of PDU indicated by current NACK_SN territory after being used to indicate this E4 territory.

In this step, introduce new RLC STATUS PDU form i.e. the 2nd RLC STATUS PDU form, generate RLC STATUS PDU packet, the RLCSTATUS PDU form of the 2nd RLC STATUS PDU form and existing system is unlike introducing E3 territory and E4 territory, the implication in other territories is then identical, does not repeat them here.

Here, when the data of a PDU are all lost and there is thereafter the PDU of at least one generation loss of data, the E1 territory after the NACK_SN territory that this PDU is corresponding is 1 and E2 territory is 0.Now, the PDU that loss of data occurs after this PDU is likely immediately following PDU that total datas lose occurs for several thereafter, like this, and the instruction utilizing E3 territory can realize PDU to lose continuously.So, will the PDU by the multiple continuous loss of multiple NACK_SN territory instruction do not needed, and only need to indicate with head and the tail two NACK_SN territories, thus significantly can reduce the expense in NACK_SN territory.

After introducing E4 territory in this step, a NACK_SN territory only can be used to indicate multiple loss segmentations of same PDU, like this, the expense in repetition NACK_SN territory can be reduced, thus significantly can reduce the expense in NACK_SN territory.

Preferably, the value in described E3 territory can be configured to 1, indicate the PDU from the PDU sequence number indicated by NACK_SN territory corresponding to this PDU to the PDU sequence number indicated by next NACK_SN territory in scope to lose continuously; The value in described E3 territory is configured to 0, indicates next NACK_SN territory to be not used in the NACK_SN territory instruction PDU function of losing continuously corresponding to this PDU of associating.

Preferably, the value in described E4 territory can be configured to 1, followed by the SOstart territory of other segmentations of PDU indicated by current NACK_SN territory and Soend territory after indicating this E4 territory; The value in described E4 territory is configured to 0, after indicating this E4 territory, there is not SOstart territory and the Soend territory of other segmentations of PDU indicated by current NACK_SN territory.

Described RLC STATUS PDU Packet Generation is given the transmitting terminal of described data by step 202, described receiving terminal.

Preferably, in order to improve the compatibility of the present invention and existing system, the control PDU Type C PT territory in described RLC STATUSPDU packet can be utilized to be the 2nd RLC STATUS PDU form to indicate the Format Type of RLC STATUS PDU packet.Particularly, any one untapped value can be selected from the reservation thresholding of the RLC STATUS PDU form of existing system, as the CPT thresholding being used to indicate the 2nd RLC STATUSPDU form.Such as, 001 can be set to.

In sum, these are only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.

Claims

1. transmit a feedback method, it is characterized in that, comprising:

2. method according to claim 1, it is characterized in that, when the value in described E3 territory is 1, the PDU from the PDU sequence number indicated by NACK_SN territory corresponding to this PDU to the PDU sequence number indicated by next NACK_SN territory in scope is indicated to lose continuously;

When the value in described E3 territory is 0, the NACK_SN territory indicating next NACK_SN territory to be not used in this PDU of associating corresponding is lost continuously to indicate PDU.

3. method according to claim 1, is characterized in that, when the value in described E4 territory is 1, followed by the SOstart territory of other segmentations of PDU indicated by current NACK_SN territory and Soend territory after indicating this E4 territory;

When the value in described E4 territory is 0, after indicating this E4 territory, there is not SOstart territory and the Soend territory of other segmentations of PDU indicated by current NACK_SN territory.

4. method according to claim 1, is characterized in that, described method comprises further:

The control PDU Type C PT territory in described RLC STATUS PDU packet is utilized to indicate the form of described RLCSTATUS PDU packet to be the 2nd RLC STATUS PDU form.

5. method according to claim 1, is characterized in that, the value in described CPT territory is 001.