CN101039256B - Method for transmitting sectionally packet control unit frame - Google Patents

Method for transmitting sectionally packet control unit frame Download PDF

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Publication number
CN101039256B
CN101039256B CN2006100651385A CN200610065138A CN101039256B CN 101039256 B CN101039256 B CN 101039256B CN 2006100651385 A CN2006100651385 A CN 2006100651385A CN 200610065138 A CN200610065138 A CN 200610065138A CN 101039256 B CN101039256 B CN 101039256B
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control unit
unit frame
packet control
transmission
frame
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CN101039256A (en
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王建军
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ZTE Corp
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ZTE Corp
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Abstract

The invention discloses a subsection transmission method for packet controlling unit frame, which is invented to solve the problems of low rate in channel multiplexing and low efficiency in transmission in the existing mobile communication technology when the packet uplink and downlink data is bidirectional transmitted in the ABIS port between base station transceiver and base station controller. During the transmission of the packet controlling unit frame, the invention divides the packet controlling unit frame that is greater than the link transmission capacity into segments. Through adding characteristics bytes to the head of the packet controlling unit frame of transmission in accordance with the link transmission capacity, the invention signed whether the data frame which will be transmitted is a complete frame or partial segments. If the transmission data is partial segments +complete segment or partial segments +partial segments, the method will add a flag bit labeling the length of the first segment in the head of the packet controlling unit frame and then transmits a segment or two segments data of the packet controlling unit frame during one time slot of transmission. The method has advantages of channel multiplexing while PCU frame is transmitted, improving the efficiency of transmission.

Description

Method for transmitting sectionally packet control unit frame
Technical field
The present invention relates to the method for PCU (packet control unit) frame segment transmissions, particularly relate in the mobile communication grouping up-downgoing data BTS (base station transceiver)＜-BSC (base station controller) between the method for PCU frame data segment transmissions during ABIS mouth (interface between base station and the base station controller) transmitted in both directions.
Background technology
PCU is converted into grouping with frame from wireless portion, and perhaps reverse operating sends a PCU frame every 20 milliseconds.Its load bearing unit (PCU control unit) major function is the Gb Interface that provides between BSC and two nodes of SGSN (service GSN) based on frame relay, and speed is 2Mb/s.The configuration mode of PCU in GPRS mainly contains two kinds:
First kind of configuration: PCU is placed on BSC one side, physically is total to the location with BSC, the transmission between PCU and the BSC is easy to realize.More suitable concerning the bigger system of BSC capacity; And for the less system of BSC capacity, because BSC quantity is more relatively, this configuration will raise because of network element too much causes cost;
Second kind of configuration: PCU is placed on GSN one side, physically with the same location of GSN.Can realize the shared same PCU of a plurality of BSC, but each BSC increases to the transmission cost between the PCU, only is applicable to the system that the BSC capacity is less, and PCU requires to have bigger capacity and disposal ability.
Under the situation that adopts first kind of configuration, BSC in the time of the GPRS transmitted in packets＜-the two-way transfer of data of BTS all is the frame mode transmission with the PCU frame, the PCU frame be finish BSC＜-BTS between the primitive of ABIS mouth transmitted in both directions, the transmission content format is CS-1 in the PCU frame, (MCS-1 MCS-2) adopts the 16k link mode to CS-2.For CS-3/4, MCS-3 ~ MCS-9 type of coding, requiring bandwidth at the ABIS mouth is 2 more than the 16Kbps.When adopting the MCS-9 coded system, the data rate of the every time slot of ABIS interface is 16Kbps, and data rate can reach 80kbit/s behind the adding EGPRS.Under some coded system, can take 2 ABIS time slots such as MCS-3 actual transmissions byte number, but actual flow is little by little bigger a little than 1 ABIS time slot, therefore relatively waste.
Frame is that not subpackage transmits under traditional processing mode, and there is bigger waste in the time slot bandwidth of using under some coded format.
Summary of the invention
In order to overcome above-mentioned defective, the object of the invention is to provide a kind of packet control unit frame data that reduce the transmission time slot bandwidth to carry out the method for segment transmissions.
In order to achieve the above object, the method of a kind of sectionally packet control unit frame transmission of the present invention, packet control unit frame is between base station controller and base station transceiver during transmitted in both directions, packet control unit frame greater than the link transmission ability is carried out segmentation, transmittability according to transmission link adds attribute byte at the head of the packet control unit frame of transmission, whether the Frame that sign will transmit is whole frame or segmentation section, if the data of transmission are segmentation section+complete segment or segmentation section+segmentation section, the length mark position that will add first segmentation of sign, the data of one section or two sections packet control unit frame of transmission in a transmission time slot then at the head of packet control unit frame.
Wherein, the step of transmission packet control unit frame is:
1. judge that last transmission has remaining content or not and do not distribute:, enter step 2. if there is not remaining content; If there is remaining content then to enter step 3.;
2. judge the physical length of current buffer data, whether surpass the link transmission ability: if do not surpass, add attribute byte in transmission beginning field, described attribute byte is header content Data Labels position 00, directly transmit current group control unit frame data then, enter step then 5.; If surpass, add attribute byte in transmission beginning field, described attribute byte is a header content flag bit 01, transmits the packet control unit frame data of the maximum length that can transmit then, directly enters step 5. then;
3. judge that current buffer data physical length adds next new packet control unit frame length and whether surpass the link transmission ability: if do not surpass, add attribute byte in the beginning field, described attribute byte is header content Data Labels position 10, export the length mark position of a packet control unit frame remainder then, this output length is BIT Len, then export the content of a packet control unit frame remainder and the data of new packet control unit frame, its length promptly deducts BIT for the length mark position that this transmission channel transmittability deducts a packet control unit frame remainder LenDeduct header content Data Labels position again; Enter step 5.; If surpass, enter step 4.;
4. judge that current buffer data physical length adds that next new packet control unit frame length and one adjust coefficient and whether surpasses the link transmission ability: if do not surpass, add attribute byte in transmission beginning field, described attribute byte is header content Data Labels position 11, export the length mark position of a packet control unit frame remainder then, this output length is BIT Len, then export the new packet control unit frame data of a packet control unit remainder content and part, its length promptly deducts BIT for the length mark position that this transmission channel transmittability deducts a packet control unit frame remainder LenDeduct header content Data Labels position again, enter step then 5.; If surpass, add attribute byte in transmission beginning field, described attribute byte is a header fields transmission time slot frame type 01, exports the content of a packet control unit frame remainder then, enters step 5.;
5. dateout is to receiving terminal.
Wherein, the step that receives packet control unit frame is: if the header content Data Labels position 00 that receives enters step I, if 01 enter Step II, if 10 enter Step II I, if 11 enter step IV:
I unties the remainder data becomes a complete packet control unit frame, enters step V;
II unties the part that remainder becomes a packet control unit frame, judges whether local cache remains content: if the residue content is arranged, combine with the local cache content, form a complete packet control unit frame, enter IV; If do not remain content, buffer memory it, enter step V;
III from the 3rd of the packet control unit frame that receives to 2+BIT LenThe length mark position of a last packet control unit frame remainder is taken out in the position, unties 2+BIT LenThe content of a last packet control unit frame remainder of back, position, the data combination that obtains with buffer memory obtains the data of a last packet control unit frame, unties last data, and it is whole to obtain a new packet control unit frame, enters step V;
IV from the 3rd of the packet control unit frame that receives to 2+BIT LenThe length mark position of a last packet control unit frame remainder is taken out in the position, unties 2+BIT LenA last packet control unit frame remainder content of back, position, the data combination that obtains with buffer memory obtains the data of a last packet control unit frame, unties last data, obtains a new packet control unit frame and partly is worth, and buffer memory it, enter step V;
V handles the packet control unit time slot frame that decoding is finished, and the incomplete packet control unit frame of buffer memory treats that next time, decoding was used.
In particular, the present invention relates to the BSC of GPRS/EDGE system＜-BTS between the method for sectionally packet control unit frame transmission of low speed chain circuit, before new packet control unit frame of transmission begins, last packet control unit frame must send finish or remainder last time this must send together with new frame, purpose is carry out the packet control unit data packet transmission multiplexing, reduce the transmission time slot requirement, to improve link bandwidth utilization rate, channel multiplexing when the method helps the packet control unit frame transmission, and then improve efficiency of transmission.
Description of drawings
Fig. 1 is the transmission PCU frame flow chart of PCU frame method for transmitting sectionally of the present invention;
Fig. 2 is the reception PCU frame flow chart of PCU frame method for transmitting sectionally of the present invention;
Fig. 3 is the later PCU time slot frame structure of PCU frame of the present invention subpackage;
Fig. 4 is the present invention's one MCS-3 PCU frame coding presequence first frame structure;
Fig. 5 is the present invention's one MCS-3 PCU frame coding presequence second frame structure;
Fig. 6 is the present invention's one MCS-3 PCU frame coding back frame sequence first frame structure;
Fig. 7 is the present invention's one MCS-3 PCU frame coding back frame sequence second frame structure.
Embodiment
The GPRS/EDGE system is when passing through PCU transmission frame number certificate, transmittability according to transmission link adds attribute byte at the head of the PCU frame of transmission, whether the Frame that sign will transmit is whole frame or segmentation section, if the data of transmission are segmentation section+complete segment or segmentation section+segmentation section, the length mark position that will add first segmentation of sign, the data of one section or two sections PCU frame of transmission in a transmission time slot then at the head of PCU frame.
Up direction is that BTS is to BSC, down direction is that BSC is to BTS, it is different to reach interior data RLC/MAC (Radio Link control/media interviews control) data under the different coding mode, therefore final PCU frame data length is also different, here be example only: suppose to wish frame data at 1 * 16k time slot the inside transmission PCU with MCS-3, be provided with two through overcompression or remove the PCU data that packing ratio top grade method handles and need to transmit, the data length of first PCU frame is 357bits, second PCU frame length is 200bits, because bottom transmitting synchronous etc. need expend some transmission bandwidths, establishing this 1 * 16k time slot can data quantity transmitted be the every frame of 315bits.The PCU frame is carried out segmentation, the data of segmentation are divided into four classes for this reason:
1. complete segment;
2. segmentation section;
3. segmentation section+complete segment;
4. segmentation section+segmentation section;
For the purpose of distinguishing, the newly-generated frame that comprises the PCU content is called the transmission time slot frame, each transmission time slot frame has a header and a data field, and data field carries actual PCU frame information, and header fields comprises following parameter:
1. transmission time slot frame type.What whether this parameter unique identification present frame transmitted is whole frame, otherwise is exactly to have fragmented frame.
Sequence number Segment type Header fields transmission time slot frame type (bit)
1 Complete segment 00
2 The segmentation section 01
3 Segmentation section+complete segment 10
4 Segmentation section+segmentation section 11
2. if comprise content in the frame from two PCU frames, be exactly header type be 10/11 bag, then header also comprises the Length Indication of first section content in the PCU time slot frame, in bit.The first that counts first PCU frame is PCU1Sec1, and length is 313bits, and second portion is PCU1Sec2, and length is 44bits, and second PCU frame is designated as PCU2.
The mode that should send in order different PCU frames sends, and that is to say, before new PCU frame of transmission began, last PCU frame must send end or remainder last time must send together with this new frame.
See that Fig. 3 is to Fig. 6: the structure chart of MCS-3 PCU frame sequence after original/conversion:
Transmitting terminal:
Step 1 obtains importing data from buffer memory, be a new PCU frame, add up the length of first PCU frame, its value is for 357bits, greater than 315bits, therefore the PCU frame will be divided into twice transmission, transmits content for the first time to be: the 313bit of transmission header (TH) bit value 01 and first PCU frame front;
Step 2 obtains data from buffer memory, comprise the part that a PCU frame does not transmit, and its length is 44bits, and a new PCU frame sequence is arranged in addition, and its length is 200bits;
Step 3, PCU frame one remainder and PCU frame two length and less than 315bits, can once transmit simultaneously in the past, output header content Data Labels position 10, expression comprises PCU frame and complete PCU frame that this is a segmentation here;
Step 4, the dateout bit: 0 0,010 1100, the length position 44bits of expression first;
Step 5 is exported a PCU frame remainder;
Step 6 is exported the content of second new PCU frame.
Receiving terminal:
Step I obtains the data that receive from buffer memory, transmission header (TH) bit value is 01, and expression is a new PCU frame, and transmission is not finished fully, and remaining data are front 313bits data of first PCU frame, buffer memory it;
Step II obtains the data that receive, transmission header (TH) bit value 10 from buffer memory, represent that this is an incomplete PCU frame and a whole frame, the 3rd to the 11st of transmission header (TH), its value is 0 0,010 1100, the length of expression first, the data of output 44bits length subsequently;
Step II I merges and step I data in buffer, obtains PCU frame one;
Step IV, output residue content obtains the content of PCU frame two.
In this method, before sending a new packet control unit frame and beginning, last packet control unit frame must send finish or remainder last time this must send together with new frame, purpose is carry out the packet control unit data packet transmission multiplexing, reduce the transmission time slot requirement, to improve link bandwidth utilization rate, the channel multiplexing when the method helps the packet control unit frame transmission, and then raising efficiency of transmission.

Claims (3)

1. method for transmitting sectionally packet control unit frame, packet control unit frame is between base station controller and base station transceiver during transmitted in both directions, packet control unit frame greater than the link transmission ability is carried out segmentation, it is characterized in that, transmittability according to transmission link adds attribute byte at the head of the packet control unit frame of transmission, whether the Frame that sign will transmit is complete segment, the segmentation section, segmentation section+complete segment, segmentation section+segmentation section, if being the remainder of former frame, the data of transmission add new transmission frame, promptly transmitting content is segmentation section+complete segment, perhaps Chuan Shu data are the part that the remainder of former frame adds new transmission frame, promptly transmitting content is segmentation section+segmentation section, the length mark position that then adds first segmentation of sign, the data of transmission packet control unit frame in a transmission time slot then at the head of packet control unit frame.
2. according to the described method for transmitting sectionally packet control unit frame of claim 1, it is characterized in that the step that sends packet control unit frame is:
1. judge that last transmission has remaining content or not and do not distribute:, enter step 2. if there is not remaining content; If there is remaining content then to enter step 3.;
2. judge the physical length of current buffer data, whether surpass the link transmission ability: if do not surpass, add attribute byte in transmission beginning field, described attribute byte is header content Data Labels position 00, directly transmit current group control unit frame data then, enter step then 5.; If surpass, add attribute byte in transmission beginning field, described attribute byte is header content Data Labels position 01, transmits the packet control unit frame data of the maximum length that can transmit then, directly enters step 5. then;
3. judge that current buffer data physical length adds next new packet control unit frame length and whether surpass the link transmission ability: if do not surpass, add attribute byte in the beginning field, described attribute byte is header content Data Labels position 10, export the length mark position of a packet control unit frame remainder then, this output length is BIT Len, then export the content of a packet control unit frame remainder and the data of new packet control unit frame, its length promptly deducts BIT for the length mark position that this transmission channel transmittability deducts a packet control unit frame remainder LenDeduct header content Data Labels position again; Enter step 5.; If surpass, enter step 4.;
4. judge that current buffer data physical length adds that next new packet control unit frame length and one adjust coefficient and whether surpasses the link transmission ability: if do not surpass, add attribute byte in transmission beginning field, described attribute byte is header content Data Labels position 11, export the length mark position of a packet control unit frame remainder then, this output length is BIT Len, then export the new packet control unit frame data of a packet control unit remainder content and part, its length promptly deducts BIT for the length mark position that this transmission channel transmittability deducts a packet control unit frame remainder LenDeduct header content Data Labels position again, enter step then 5.; If surpass, add attribute byte in transmission beginning field, described attribute byte is header content Data Labels position 01, exports the content of a packet control unit frame remainder then, enters step 5.;
5. dateout is to receiving terminal.
3. according to the described method for transmitting sectionally packet control unit frame of claim 2, it is characterized in that, the step that receives packet control unit frame is: if the header content Data Labels position 00 that receives enters step I, if 01 enters Step II, if 10 enter Step II I, if 11 enter step IV:
The data that I unties input become a complete packet control unit frame, enter step V;
II unties the part that remainder becomes a packet control unit frame, buffer memory it, enter step V;
III from the 3rd of the packet control unit frame that receives to 2+BIT LenThe length mark position of a last packet control unit frame remainder is taken out in the position, unties 2+BIT LenThe content of a last packet control unit frame remainder of back, position, the data combination that obtains with buffer memory obtains the data of a last packet control unit frame, unties last data, and it is whole to obtain a new packet control unit frame, enters step V;
IV from the 3rd of the packet control unit frame that receives to 2+BIT LenThe length mark position of a last packet control unit frame remainder is taken out in the position, unties 2+BIT LenA last packet control unit frame remainder content of back, position, the data combination that obtains with buffer memory obtains the data of a last packet control unit frame, unties last data, obtains a new packet control unit frame and partly is worth, and buffer memory it, enter step V;
V handles the packet control unit time slot frame that decoding is finished, and the incomplete packet control unit frame of buffer memory treats that next time, decoding was used.
CN2006100651385A 2006-03-17 2006-03-17 Method for transmitting sectionally packet control unit frame Expired - Fee Related CN101039256B (en)

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CN101990241B (en) * 2009-08-06 2013-08-07 中兴通讯股份有限公司 Packet data transmission system and method
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CN103346949B (en) * 2013-07-25 2016-08-17 北京大学 Based on Embedded dual pathways network packet unpack and organize bag method and system
CN105512079B (en) * 2015-12-12 2018-07-03 中国航空工业集团公司西安航空计算技术研究所 A kind of 1394 bus multi-channel flow datas organize packet method parallel
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