CN1964292A - A method used to detect and feedback frame loss ratio of lub FP frame based on IP transmission - Google Patents
A method used to detect and feedback frame loss ratio of lub FP frame based on IP transmission Download PDFInfo
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Abstract
The disclosed method for detecting the lost Iub FP frame based on IP transmission comprises: setting one or more buffer segments every responding to preset-volume FP frame from sending end to receiving end; and, detecting the lost frame number to every segment to obtain the complete study on lost frame. This invention is benefit to improve the reliability of FP frame transmission.
Description
Technical field
The present invention relates in UTRA (universal terrestrial radio access) TDD (time division duplex) system, guarantee the correlation technique of Iub link FP Frame reliable transmission, be mainly used in the loss situation that detects and feed back IP-based Iub FP frame.
Technical background
UMTS (universal mobile telecommunications system) system is the 3-G (Generation Three mobile communication system) that wireless technology adopts WCDMA (Wideband Code Division Multiple Access (WCDMA)).WCDMA is divided into UTRA FDD (Frequency Division Duplexing (FDD)) and UTRA TDD, UTRA TDD is also referred to as TD-CDMA (TD-CDMA Time Division-Code Division Multiple Access), it can support the message transmission rate (Release99/Release 4 standards) that 384Kbps does not wait to 2Mbps: at the state of high-speed mobile, the transmission rate of 384Kbps can be provided, under low speed or indoor environment, then can provide transmission rate up to 2Mbps.UTRA TDD uplink transmission channels comprises RACH (Random Access Channel), CPCH (CPCH), DCH (dedicated channel) etc., and downlink transmission channel comprises BCH (broadcast channel), PCH (paging channel), FACH (forward access channel), DSCH (DSCH Downlink Shared Channel) and DCH etc.Wherein, be used for carrying user data/the down direction transmission channel has RACH/FACH, CPCH/FACH, DCH/DCH and DCH/ (DCH+DSCH).Between Node-B (Node B, i.e. base station) and RNC (radio network controller), 3GPP has defined Iub interface and has carried out communication, and has defined the data that FP (Frame Protocol) agreement is transmitted each transmission channel.
ATM (asynchronous transfer mode) is generally adopted in the carrying of Iub interface, as Fig. 1.But adopt the ATM transmission cost too high, maturation and large-scale application along with IP (Internet Protocol) switching technology, the transmission of adopting IP to carry communication data becomes the first-selection that improves throughput to greatest extent and reduce cost, and therefore the transmission of adopting the IP technology to carry out Iub and other interface data will be the future trend of 3G (third generation wireless telecommunication system).IP passes the advantage that elm has low-cost and high-throughput, but the reliable transmission that an inevitable shortcoming is IP is not as atm device, use IP to pass the problem that elm FP frame unavoidably can face a packet loss, and IP agreement itself does not detect the mechanism of Frame packet loss and assurance reliable transmission, therefore needs a kind of new technology solve the packet loss detection that the FP frame transmits on IP.
The present invention is directed to the problems referred to above and proposed the detection and the feedback mechanism of a kind of Iub FP frame (comprising Frame and control frame) frame losing, solved the problem that FP frame frame losing that the IP exchange causes detects, and can carry out corresponding adjusting to offered load, thereby help improving the reliability of IP-based FP frame transmission based on detected frame loss condition.
Summary of the invention
Put it briefly, the invention provides following technical scheme:
According to a first aspect of the invention, provide a kind of method that is used to detect based on the Iub FP frame frame loss condition of IP transmission, comprise step:
One or more buffer field is set, and each buffer field is corresponding to the FP frame of the continuous predetermined quantity that sequentially sends to receiving terminal from transmitting terminal; And
Measure the frame losing number for each buffer field, to obtain the frame loss condition of receiving terminal.
According to a second aspect of the invention, provide a kind of radio network controller (RNC) in universal terrestrial radio access (UTRA) time division duplex (TDD) system, it is configured for realizes as the described method of above-mentioned first aspect present invention.
According to a third aspect of the invention we, provide a kind of wireless network control Nobe B in universal terrestrial radio access (UTRA) time division duplex (TDD) system, it is configured for realizes as the described method of above-mentioned first aspect present invention.
According to a forth aspect of the invention, provide a kind of and insert (UTRA) time division duplex (TDD) system in universal terrestrial radio, it comprises as the described radio network controller (RNC) of above-mentioned second aspect present invention and as the described Node B of above-mentioned third aspect present invention, for use in realizing as the described method of above-mentioned first aspect present invention.
Description of drawings
By the description of the specific embodiment of the present invention being carried out below in conjunction with accompanying drawing, it is clearer that purpose of the present invention, feature and technical benefits will become.In the accompanying drawings:
Fig. 1 is the schematic diagram that illustrates based on the FP protocol stack of ATM and IP carrying;
Fig. 2 is illustrated in the figure that is used for detecting and feeding back the employed FP frame head of the method structure of the Iub FP frame frame loss rate of transmitting based on IP of the present invention;
Fig. 3 is illustrated in the figure that is used for detecting and feeding back the employed buffer structure of method of the Iub FP frame frame loss rate of transmitting based on IP of the present invention;
Fig. 4 is illustrated in of the present inventionly to be used for detecting and to feed back figure based on the message structure of the employed frame losing FEEDBACK CONTROL of the method frame of the Iub FP frame frame loss rate of IP transmission;
Fig. 5 is illustrated in of the present inventionly to be used for detecting and to feed back schematic flow diagram based on transfer sequence number wrong indication control frame between the method receiving terminal of the Iub FP frame frame loss rate of IP transmission and the control end.
Embodiment
The present invention proposes a kind of method that detects IP-based Iub FP protocol frame transmission reliability.In order to realize this method, defined a new FP frame head, the FP frame head comprises 2 bytes, comprising the frame type of 1 bit (Frame Type, FT), the sequence number of 11 bits and the type of message of 4 bits, as shown in Figure 2.
Wherein, the bit 7 of first byte is used to refer to the type of FP frame, and 0 expression FP frame is a Frame, and 1 expression FP frame is a control frame, and is as shown in table 1.
| Frame type (FT) | Describe |
| 0 | |
| 1 | Control frame |
Table 1 frame type
The 0th～3 bit of second byte represented the type of message of FP frame carrying.For Frame, the occurrence of type of message detailed presentations in table 2:
| Type of message | Bit3～0 |
| FACH | 1000 |
| RACH | 1001 |
| DSCH | 1010 |
| USCH (Uplink Shared Channel) | 1011 |
| DCH | 1100 |
| Keep | Every other combination |
Table 2 Frame type of message
For control frame, type of message is as described in Table 3:
| Type of | Bit | 3 to 0 |
| Time is adjusted | 0010 | |
| Downlink synchronization | 0011 | |
| Uplink synchronisation | 0100 | |
| Descendant node is synchronous | 0110 | |
| Upstream node is synchronous | 0111 | |
| Dynamically PUSCH distributes | 0000 | |
| The FP Connection Frame Number | 1001 | |
| The TPC indication | 1010 | |
| The sequence number errors indication | 1111 | |
| Keep | Every other combination |
Table 3 control frame type of message
The bit 6～0 of first byte and the bit 7～4 of second byte are used for forming a sequence number (11 altogether, value is 0～2047), and wherein the 6th bit of first byte is represented the high position of sequence number.
The front has illustrated owing to adopt the carrying of IP as the FP frame, can cause losing of Frame.In order to detect frame losing, method of the present invention has been utilized this sequence number of 11.Use continuous sequence number to make it possible to detect the Frame of losing, when connecting, sets up a FP, transmitting terminal begins to send the FP frame, every transmission one frame, transmitting terminal need be filled in and transmit Sequence Number, till the sequence number since 0 to 2047, and then since 0 circulation, promptly following circulation 0,1,2,3,4,5 ... 2045,2046,2047,0,1,2 ...So just can compare from the number of frames that receives previously and the number of frames of current reception, if the sequence number of this two frame is not continuous, illustrating so in the middle of two frame data has the FP LOF.Certainly this is the simple detection method that extensively adopts now.If not frame losing might take place a plurality of routing forwarding of FP frame process, but the FP frame of sending out earlier back arrival on the contrary in this case, is adopted this method that flase drop can take place and is surveyed, so must prevent the generation of this situation.For this reason, need the sequence number of buffer memory some (being called window) successfully to arrive sign, promptly certain interval number aim sequence labelled notation buffer memory is got off, and set the timer of the frame arrival of each sequence number correspondence, when frame data arrive, corresponding sequence number sign is made as successfully.If the timer expiry of certain sequence number correspondence, but the FP frame of this sequence number also do not receive, so will this sequence number respective flag position for the failure.So just can detect the FP frame of losing more accurately.Two difficult points are arranged here, the one, it is suitable how many window sizes of sequence number buffer memory is made as, and this parameter can be determined according to different network conditions by those skilled in the art.General principle is if network delay is big more, so window need be provided with big more, if network delay is smaller, corresponding window just can be provided with smaller.The 2nd, the resource of required timer too many (linear) with the window size of sequence number buffer memory.Problem can adopt following solution hereto.The sequence number buffer area is divided into the plurality of continuous interval, and each timer is responsible for one section interval, if i.e. certain timer expiry, and the FP frame of sequence number correspondence does not arrive in the corresponding segment, and these not have FP frames of arrival will be considered to lose so.Do the precision that can influence some detections like this, if but the value of suitable raising timer just can remedy this loss.As for will what improving, can determine according to different network conditions by those skilled in the art to the value of timer.Buffer structure (below will be described in detail) specifically as shown in Figure 3.
When LOF is detected, need the notice transmitting terminal.Two kinds of mechanism are arranged here, and a kind of is feedback mechanism immediately, according to this mechanism, notifies transmitting terminal at once when detecting lost frames, and a frame number of losing is also issued transmitting terminal.This method is fit to the transmitting terminal needs and knows the instant messages that sends mistake, in the time of if any retransmission mechanism.Another kind is the threshold value alarming mechanism, according to this mechanism, frame loss rate in transmitting terminal is added up certain Frame, if this frame loss rate has surpassed the threshold value that allows, receiving terminal sends to transmitting terminal again, notify the other side to take measures to reduce frame losing, this method is very suitable for the flow control of Iub.Here it should be noted that, because qos requirement difference, so the FP control frame generally need be provided with different threshold values with Frame, and the statistics of Frame and control frame is independently to carry out, in general the threshold ratio of control frame is low, and is higher because the transmission reliability of control frame requires.
The present invention has also defined the detection that a kind of control frame carries out frame losing.Fig. 4 shows the message structure of this frame losing FEEDBACK CONTROL frame of the present invention's definition.Following table 4 has provided the frame head of frame losing FEEDBACK CONTROL frame as shown in Figure 4 and the formation details of payload.The frame head structure of this control frame can be identical with the frame head structure among above-mentioned Fig. 2.In addition, " sequence number errors indication " carried out as giving a definition in the frame head to frame shown in the above-mentioned table 3: when needs were notified the situation of the current frame losing of transmitting terminal, receiving terminal transmission type of message was that the control messages of " sequence number errors indication " is given transmitting terminal.If above-mentioned first kind of feedback mechanism immediately, then control messages also needs with the sequence number of going up current lost frames.
Table 4
| The cell type | Byte offset | Describe |
| The |
0 | 2 bytes |
| The frame number of losing | 2 | 2 bytes are used to detect the mechanism that packet loss just returns immediately, if adopt the threshold value alarming mechanism then to be changed to 0 |
| Frame loss rate surpasses the |
4 | 1 byte is used for the threshold value alarming mechanism, two ranks are arranged, on behalf of the control frame frame loss rate, 1 exceed control frame, and 2 representative data frame frame loss rates exceed control frame |
Suppose to send FP DSCH Frame to Node B from RNC, and adopt second kind of above-mentioned threshold value alarming mechanism to feed back frame losing information, promptly frame loss rate just feeds back to RNC above threshold value.Suppose that buffer area length is N (frame), the siding-to-siding block length that each timer is responsible for is M (frame), and then required timer number is:
T＝N/M (1)
Wherein, the buffer area length N all can be set according to different network conditions by those skilled in the art with siding-to-siding block length M.
At first set up FP and connect, when first FP frame sent, it was 0 that RNC is provided with sequence number value, later every transmission one frame, and sequence number value adds 1, when sequence number value is maximum 2047, sequence number is changed to 0 again.Receiving terminal Node B at first distributes spatial cache, the flag bit b of N frame number correspondence
1, b
2, b
3... b
NBe mapped to spatial cache, and the value of all flag bits in the spatial cache is predisposed to 0, then this spatial cache is divided into the T section.In case a certain section first frame data of receiving that it comprises just start the timer of this section.First frame data here might not be the FP frames of first frame number correspondence, because the Frame that might send out is earlier received after on the contrary.For example,, then might not receive the x frame data earlier, but at first receive y frame data (y＞x, but y and x belong to same interval i) if x is the sequence number of first flag bit correspondence of interval i.After receiving the y frame, just should start this interval timer T (i).Node B receives a certain frame data, just the number of frames corresponding cache sign with this frame is changed to 1.Overtime as T (i), receiving terminal Node B checks that all M the FP frames whether interval i comprises all arrive (checking that promptly the value whether flag bit is arranged among the i of this interval also is 0).All arrive if not all M frame data, then write down the frame number Ki that all do not have the FP frame of arrival, all buffer memory signs (being changed to 0) of this timer-operated i section that resets then and timer itself (resetting of timer itself makes it can be used for carrying out the frame losing detection of a following buffer window (N frame data)), and a corresponding number of frames makes a new M sequence number (increasing progressively successively) into.Like this, just can detect the frame losing number of the new M frame data in back, all interval frame losing numbers will be E by accumulative total.When totalframes reaches the maximum number L that statistics is set
Max, just can calculate this L with following formula (2), (3)
MaxThe frame loss rate of individual FP frame:
Frame loss rate=E/L
Max(3)
Wherein, L
MaxConcrete value can determine according to network condition by those skilled in the art.
When frame loss rate during greater than pre-set threshold H, receiving terminal Node B will fill in sequence number errors indication control frame, and this control frame is sent to receiving terminal RNC (as shown in Figure 5).Threshold value H can be determined according to network condition by those skilled in the art.It is noted that this control frame may lose, but this message can not retransmitted by system, because this will influence ensuing new statistics.Under the situation of this frame losing FEEDBACK CONTROL LOF, because this control frame can periodically (for example can be every L in the present embodiment usually
MaxFrame) send, therefore losing indivedual control frames can not bring very big influence to systematic function.Certainly, if losing when system caused unacceptable influence of this control frame can consider to adopt more responsive processing method: for example, just do not indicate frame loss rate to surpass the alarm of threshold value if receive this control frame.But so too responsive, there is the situation of wrong report, cause system just to take too drastic load balance means because of this control frame losing once in a while, also can influence systematic function.So this needs the technical staff to determine specifically to take which measure to handle according to the actual conditions of losing the influence that system is caused of this control frame.This relates to another technical problem different with principle of the present invention, will not do a step in this manual and describe.
Obtained frame loss rate and surpassed after the alarm of threshold value, transmitting terminal RNC just can take suitable action to reduce offered load, thereby improves the reliability of transmission.
Should be noted that, though the foregoing description is to detect when sending the FP frame to Node B from RNC and feedback is an example based on the method for the Iub FP frame frame loss rate of IP transmission, but it will be appreciated by those skilled in the art that sending the FP frame from Node B also exists needs to handle the situation of frame losing to RNC.Can handle with the similar method of above-mentioned processing method, not repeat them here.
In addition, according to foregoing description as can be known, if the sequence number of FP frame is not a situation continuous but that for example arrange by ascending order, also can realize detection of the present invention and feedback method based on the Iub FP frame frame loss rate of IP transmission, the sequence number of its principle and FP frame is that continuous situation is similar.
One of ordinary skill in the art will readily recognize that above-mentioned the access in universal terrestrial radio of the present invention realize in (UTRA) time division duplex (TDD) system detecting and feedback also can realize by following configuration based on the method for the IubFP frame frame loss rate of IP transmission:
Can be by corresponding N ode B in the wireless communication system and RNC be carried out the method that corresponding configuration realizes above-mentioned detection of the present invention and feeds back the Iub FP frame frame loss rate of transmitting based on IP.Described configuration can realize in Node B and RNC respectively by software, hardware or both combinations.Those skilled in the art realize this configuration easily on the basis of the above-mentioned instruction that method of the present invention is described, do not repeat them here.Therefore the Node B and the RNC that comprise this configuration also will be understood that formation the disclosure of the specification respectively, and therefore this Node B and RNC also should be believed to comprise in protection scope of the present invention.
Said method of the present invention can be realized in comprising the UTRA TDD wireless communication system of this Node B and RNC; therefore the wireless communication system that comprises this Node B and RNC also will be understood that formation the disclosure of the specification, and therefore this wireless communication system also should be believed to comprise in protection scope of the present invention.
Can realize detection of the present invention and feedback method by the program product that comprises the machine readable instructions that is used to realize said method is provided based on the Iub FP frame frame loss rate of IP transmission.Therefore, this program product itself, and the storage medium that stores above-mentioned program product also constitutes embodiments of the present invention, should be believed to comprise in protection scope of the present invention.This storage medium for example can be ROM, RAM, and CD-ROM, CD-R, CD, magneto optical disk, storage card, or the like.
Though in conjunction with specific embodiments the present invention is had been described in detail,, it will be appreciated by those skilled in the art that the present invention is not subjected to the restriction of these specific embodiments, under the situation that does not deviate from spirit of the present invention, also can make many changes, replacement.Therefore, attached claim should give the wideest explanation, so that comprise various distortion, equivalent structure and configuration.
Claims (15)
1, a kind of method that is used to detect based on the Iub FP frame frame loss condition of IP transmission comprises step:
One or more buffer field is set, and each buffer field is corresponding to the FP frame of the continuous predetermined quantity that sequentially sends to receiving terminal from transmitting terminal; And
Measure the frame losing number for each buffer field, to obtain the frame loss condition of receiving terminal.
2, the method that is used to detect based on the Iub FP frame frame loss rate of IP transmission as claimed in claim 1 also comprises step:
For each buffer field, the frame losing number of measuring is obtained total frame losing number of this buffer field mutually, and the sum of will this total frame losing number corresponding with this buffer field FP frame is compared and is obtained frame loss rate.
3, the method that is used to detect based on the Iub FP frame frame loss rate of IP transmission as claimed in claim 2, wherein saidly measure frame losing number for each buffer field and comprise step:
For each buffer field is provided with one or more timer, each timer is responsible for the incident of one or more the continuous FP frame arrival receiving terminal that sends successively from transmitting terminal is measured;
Each timer is started by the arrival event of its any one FP frame of being responsible for, and under the situation of corresponding timer expiry to this timer in the FP frame frame losing number of no show receiving terminal count; And
For each buffer field, will with the frame losing number of its corresponding all timers countings mutually in addition as the frame losing number of measuring in this buffer field.
4, the method that is used to detect based on the Iub FP frame frame loss rate 3 of IP transmission as claimed in claim 3 wherein resets it behind timer expiry, measures to be used for frame losing next time.
5, the method that is used to detect based on the Iub FP frame frame loss rate of IP transmission as claimed in claim 3, wherein, represent by continuous number of frames from the FP frame that transmitting terminal sends, and the arrival of FP frame is set to reaches flag bit, and wherein, FP frame, FP number of frames and FP frame arrive flag bit and have relation one to one.
6, the method that is used to detect based on the Iub FP frame frame loss rate of IP transmission as claimed in claim 5, wherein, the frame head of the FP frame that sends from transmitting terminal comprises 2 bytes, comprising the frame type FT of 1 bit, the sequence number of 11 bits and the type of message of 4 bits.
7, the method that is used to detect based on the Iub FP frame frame loss rate of IP transmission as claimed in claim 6, wherein, the bit 7 of first byte of described FP frame head is used to refer to the type of FP frame, the 0th～3 bit of second byte represented the type of message of FP frame carrying, the bit 6～0 of first byte and the bit 7～4 of second byte are used for forming described FP number of frames, and wherein the 6th bit of first byte is represented the high position of sequence number.
8, as each described method that is used to detect based on the Iub FP frame frame loss rate of IP transmission among the claim 1-7, also comprise step:
To return to transmitting terminal at the FP frame loss condition that receiving terminal measures, so that transmitting terminal takes suitable action to improve the reliability of transmission.
9, the method that is used to detect based on the Iub FP frame frame loss rate of IP transmission as claimed in claim 8, the transmitting terminal of wherein said FP frame is RNC or Nobe B, corresponding FP frame receiving terminal is Nobe B or RNC.
10, the method that is used to detect based on the Iub FP frame frame loss rate of IP transmission as claimed in claim 9, wherein, by the FP frame loss condition being returned to transmitting terminal one of in feedback mechanism and the threshold value alarming mechanism immediately, in feedback mechanism immediately, when detecting frame losing, notify transmitting terminal at once, and the number of frames of the frame of losing is also issued transmitting terminal, in the threshold value alarming mechanism, when resulting frame loss rate had surpassed predetermined threshold value, receiving terminal sent to transmitting terminal with frame loss condition.
11, the method that is used to detect based on the Iub FP frame frame loss rate of IP transmission as claimed in claim 10, wherein in the threshold value alarming mechanism, with the FP Frame different threshold values is set for the FP control frame, and the measurement for the frame loss condition of FP Frame and FP control frame is independently to carry out, and the threshold value that is used for the FP control frame is lower than the threshold value that is used for the FP Frame.
12, the method that is used to detect based on the Iub FP frame frame loss rate of IP transmission as claimed in claim 11, wherein the situation of frame losing is returned transmitting terminal by frame losing FEEDBACK CONTROL frame, this frame losing FEEDBACK CONTROL frame comprises frame head and payload, the type of message that wherein comprises " sequence number errors indication " in the frame head, payload comprises that the frame loss rate of losing frame number and 1 byte of 2 bytes surpasses the threshold value sign, wherein in described feedback mechanism immediately, lose the frame number sequence number that frame number is represented detected frame losing by this, in described threshold value alarming mechanism, surpass the threshold value sign by this frame loss rate and indicate and comprise that the control frame frame loss rate exceeds the frame losing rank that control frame or Frame frame loss rate exceed control frame.
13, a kind of radio network controller (RNC) in universal terrestrial radio access (UTRA) time division duplex (TDD) system, it is configured for realizes as each described method among the claim 1-12.
14, a kind of wireless network control Nobe B in universal terrestrial radio access (UTRA) time division duplex (TDD) system, it is configured for realizes as each described method among the claim 1-12.
15, a kind of in universal terrestrial radio access (UTRA) time division duplex (TDD) system, it comprises as the described radio network controller (RNC) of above-mentioned claim 13 and as the described Node B of above-mentioned claim 14, for use in realizing as each described method among the claim 1-12.
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| SE0103506D0 (en) * | 2001-10-19 | 2001-10-19 | Ericsson Telefon Ab L M | HARQ stall avoidance |
| KR100747464B1 (en) * | 2002-01-05 | 2007-08-09 | 엘지전자 주식회사 | Timer based Stall Avoidance method in HSDPA system |
| CN1726677A (en) * | 2002-12-12 | 2006-01-25 | 皇家飞利浦电子股份有限公司 | A system and method using a circular buffer for detecting packet loss in streaming applications |
| EP1745669B1 (en) * | 2004-05-05 | 2013-07-31 | Telefonaktiebolaget LM Ericsson (Publ) | Hsdpa flow control |
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