CN101237406B - A realization method for D channel link access regulation - Google Patents
A realization method for D channel link access regulation Download PDFInfo
- Publication number
- CN101237406B CN101237406B CN200810007721XA CN200810007721A CN101237406B CN 101237406 B CN101237406 B CN 101237406B CN 200810007721X A CN200810007721X A CN 200810007721XA CN 200810007721 A CN200810007721 A CN 200810007721A CN 101237406 B CN101237406 B CN 101237406B
- Authority
- CN
- China
- Prior art keywords
- frame
- expectation
- physical channel
- lapd
- link
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Communication Control (AREA)
Abstract
The present invention discloses a method for realizing a link access procedure on a D channel; the link access procedure on the D channel is as follows: an LAPD link is borne by one or a plurality of physical channels; an assembly of the physical channels which bears one LAPD link forms a channel cluster; a realtime uplink and downlink communication state test is carried out on each of the physical channels contained by the channel cluster; according to the test result, one of the available physical channels is selected for sending a data frame before each time of sending the data frame of the LAPD link. Through the realizing method of the present invention, one LAPD link can be borne on the channel assembly formed by a plurality of physical channels, wherein the plurality of physical channels can be configured freely, the statuses of the channels are equivalent, the working means of the channels is load sharing, and the channels accomplish the load work of one LAPD link jointly.
Description
Technical field
The present invention relates to the communications field, relate in particular to a kind of D channel link access regulation implementation method of (Link AccessProcedure on the D channel is called for short LAPD).
Background technology
E1 (European transmission standard, speed is 2Mbps) transmission be the transmission medium of extensive use in the mobile communication, the LAPD agreement also just becomes the most widely used Abis mouth of present commerce (communication interface between mobile communication base station and the base station controller) data link layer protocol.Along with the ethernet technology application and development, increasingly mature based on the IP Abis technology of transmitted in packets, it is trend of the times that IP Abis replaces traditional E1 Abis.But, therefore also have interior IP Abis of quite a long time to coexist with E1 Abis owing to present main flow mobile communication carrier still remains with the E1 transmission in a large number.
LAPD be one at OSI (Open System Interconnect, open system is interconnected) agreement of working on the data link layer of architecture, it adopts common signal channel D to carry out signaling transmission control, in mobile communication equipment, be generally used for transmitting Abis mouth chain of command message, comprise Operation and Maintenance message and traffic signaling.Because the design feature of agreement itself and realization principle, traditional LAPD agreement is confined to use the carrying of wall scroll physical channel.If the site type of base station is bigger, when a large amount of Operation and Maintenance message and traffic signaling were arranged, this website of then having nothing for it but was set up the transmission that many LAPD links are used for chain of command message.This just makes base station controller that the maintenance work of LAPD link is increased greatly, and resource is independent of each other between these LAPD links, and therefore the fault of any LAPD link all can cause the disappearance of base station portion function.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of D channel link access regulation implementation method, making a LAPD link can be carried on a channel set of being made up of a plurality of physical channels closes, we claim this channel set to be combined into passage bunch, physical channel in the passage bunch can freely dispose, equal and working method is a load sharing each other, finishes the carrying work to a LAPD link jointly.
In order to address the above problem, the invention provides a kind of D channel link access regulation implementation method, the D channel link access regulation is LAPD chain route one or more physical channel carrying, and a passage bunch is formed in the set that is used to carry the physical channel of a LAPD link; Real-time up-downgoing communication condition being carried out in passage bunch every the physical channel that is comprised detect, before each transmission LAPD link data frame, is that this Frame is selected a transmission in the available physical channel according to testing result.
Further, the size of the sliding window of reception that uses of described LAPD link is at least greater than the number of physical channel in the described passage bunch.
Further, this method is carried out real-time up-downgoing communication condition detection to the physical channel in the following manner:
The regular transmit status frame of the communication two party of each physical channel is given the other side, if receive the other side's status frames in the duration of setting, judges that then the receive direction of this physical channel can be used;
Comprise transmit leg current time and time difference in the described status frames,, judge that then the sending direction of this physical channel can be used if the value of the time difference in the status frames is in the preset threshold scope from moment of this last received frame in physical channel.
Further, when selecting available physical channel, in available physical channel, select the passage of free time the most, i.e. the passage of the load minimum of judging by the load query interface of plate level support package for it for the Frame that sends.
Whether further, the receiving terminal of described LAPD link carries out buffer memory to the non-expectation frame of receiving when receiving non-expectation frame, and check expectation frame buffer memory, if then find corresponding expectation frame from buffer memory; If the expectation frame is lost, then send the Negative Acknowledgement frame to transmit leg;
After the transmitting terminal of described LAPD link is received above-mentioned Negative Acknowledgement frame, select corresponding Frame to retransmit according to the frame number of the expectation frame that wherein comprises.
Further, the receiving terminal of described LAPD link carries out the processing of following steps to the Frame that receives:
When (a) receiving terminal is received Frame, whether be that the frame number of expectation frame judges whether it is the expectation frame according to the frame number of this Frame, if, then carry out next step, otherwise, think that this Frame is non-expectation frame, execution in step (c);
(b) will expect that frame sends to upper layer application, and will expect that the frame number of frame adds up backward, again execution in step (d);
(c) judge that this non-expectation frame is whether in receiving the cunning window, if then this non-expectation frame is carried out buffer memory; Otherwise, abandon this non-expectation frame, and send acknowledgement frame to transmit leg, get back to step (a);
(d) check the receiving terminal expectation frame whether buffer memory is new, if, execution in step (b) then, otherwise, get back to step (a).
Further, in the step (c),
When non-expectation frame is carried out buffer memory, check whether the expectation frame is lost, if, then send the Negative Acknowledgement frame to transmit leg, in the Negative Acknowledgement frame, comprise the frame number of expecting frame.
Further, check in the following manner whether the expectation frame is lost:
Receiving terminal is preserved the frame number of the Frame of the last frame of receiving each physical channel, and when receiving non-expectation frame, relatively whether the frame number of these preservations has all surpassed the frame number of expectation frame, if judge that then the expectation frame loses.
Further, the receiving terminal of described LAPD link starts the Negative Acknowledgement timer and picks up counting when receiving non-expectation frame, if exceed the timing cycle of this Negative Acknowledgement timer, judges that then the expectation frame loses.
The inventive method has realized support to a plurality of physical channels by the passage cluster management, sliding window and frame losing re-transmission policy have been realized the support to the multi-channel data transmission characteristic, by the support of these two aspects, make a LAPD link can be carried on a channel set of forming by a plurality of physical channels and close.Because the resource of each physical channel is shared each other in the passage bunch, load sharing is carried out in carrying for data, improve the robustness of LAPD agreement effectively, reduced the probability that causes the base station fault because of the transmission channel fault, and effectively saved the time interval resource of Abis mouth.
In addition, the modification that the present invention proposes does not relate to the improvement of any hardware all at the LAPD agreement, realizes being suitable for multichannel with less improvement, has improved extensibility, ease for use and the reliability of LAPD.
Description of drawings
Fig. 1 be in the embodiment of the invention receiving terminal to the handling process schematic diagram of Frame.
Embodiment
The thinking of the inventive method is: if can be under the prerequisite of not doing the hardware change, the only improvement by software protocol, make a LAPD link can be carried on many physical channels, these passages can freely dispose, equal, working method is a load sharing each other, base station LAPD link maintenance work significantly reduces so, and the fault of single one physical passage will can not cause the functional fault of any base station.In addition, the working method of load sharing also can be used for minimizing the physical channel number of chain of command transmission of messages, increases the user's face physical channel number that is used for transferring voice and data, and this Abis mouth physical resource for preciousness is particularly necessary.
The present invention realizes the LAPD communication scheme by physical channel (time slot) carrying of many load sharings by improving original LAPD agreement.The present invention mainly improves the LAPD agreement from two aspects: on the one hand, on the basis of former LAPD agreement, increase multichannel adaption section---the passage cluster management, it is positioned at LAPD agreement bottom, main task is to finish real-time up-downgoing fault detect is carried out in passage bunch every the physical channel that is comprised, and is that LAPD sends data and selects available physical channel according to the mode of load sharing; On the other hand, revise the original sliding window mechanism of LAPD agreement and retransmit mode with the frame losing of stepping back the N frame, and the frame losing processing policy that adopts selectivity to retransmit.
Below technical scheme of the present invention is described in further detail.
The LAPD communication scheme of the physical channel of many load sharings of the present invention (passage bunch) carrying specifically comprises following content:
1) passage bunch is not a physical concept but a logic unit.
Many physical channels that comprise in the passage bunch can be a plurality of physical slot by time from an E1, also can be the physical slot by time that connects different E1 lines between base station and the base station controller.
The notion of passage bunch has been broken the restriction that link of traditional LAPD is only applicable to the wall scroll physical channel, make the LAPD link can be carried on many physical channels, and these physical channels are load sharings, under the situation about breaking down a physical channel, the carrying task of LAPD link can be continued to finish in other physical channels.
The management of 2) multichannel adaption section---passage bunch.
Two major functions are mainly finished in the management of passage bunch:
One, the two-way break-make real-time detection method of use passage detects the communication condition of every physical channel up-downgoing, judges according to testing result whether the physical channel is available.
The two-way break-make real-time detection method of passage can adopt heartbeat (Heart Beat) mechanism to calculate the method that combines with time difference, be communication two party on each physical channel, periodically send similar heartbeat status frames to the other side, depositing the transmit leg current time in the status frames and from the difference between the moment of this last received frame in physical channel.Communication two party can judge whether this physical channel is available according to the reception condition and the time difference in the status frames of status frames.For example,, can judge whether passage is available on receive direction,, judge that then the receive direction of this passage can be used if promptly in the duration of setting, receive the other side's status frames according to the reception condition of status frames for a certain side in the communication two party; Judge the communication conditions of passage on sending direction according to the value of the time difference in the status frames again,, judge that then the sending direction of this passage can be used if the value of the time difference in the status frames is in the preset threshold scope.
Its two, before the LAPD link sends Frame at every turn, be that it selects passage the most idle in the available physical channel.
Can judge by the two-way break-make real-time detection method of front which physical channel is available in the passage bunch, the load query interface that provides by plate level support package (Board Support Packet is called for short BSP) in these available passages is judged the minimum passage of load.
3) use the sliding window mechanism that receives and send " symmetry ".
The sliding window of reception that tradition LAPD agreement is used is asymmetric with the sliding window of transmission, the size that receives sliding window is fixed as 1, any non-expectation frame (frame number and the different Frame of expecting to receive of frame number) all will directly be abandoned, and this is infeasible for link layer protocol of using the multichannel transmission.Because when the passage that uses multichannel to form bunch carrying, often there is the Frame of " back send out earlier to " in data from the physical channel of different E1, these elder generation's non-expectation frames extremely should be buffered, wait for after expectation frame (carrying the Frame of the frame number of expectation reception) arrives and give upper layer application together, therefore, need to receive the size that sliding window has and the sliding window of transmission equates; Perhaps, the size that receives sliding window is greater than the number of physical channel in the passage bunch at least.
4) the frame losing processing mode of using selectivity to retransmit.
Because the size of the sliding window of the reception of traditional LAPD agreement is fixed as 1, any non-desired data frame all will directly be abandoned, therefore what use for the processing mode of frame losing is the strategy of stepping back the N frame, and it is low to the treatment effeciency of the situation that has " back send out earlier to " Frame in a large number.Because LAPD agreement of the present invention adopts and send the sliding window of the reception of sliding the identical size of window, the Frame of " back is sent out earlier extremely " can be buffered in and receive in the sliding window, therefore uses selectivity to retransmit the frame losing processing mode and will effectively improve multichannel efficiency of transmission.When the recipient judges the frame losing generation, send Negative Acknowledgement frame (REJ frame) to transmit leg immediately, the REJ frame represents that receiving terminal detects the Frame of sending the opposite end mistake is arranged, and requires the opposite end to retransmit this Frame.Deposit the expectation frame number that receives sliding window in the REJ frame, transmit leg then retransmits by the Frame that these expectation frame numbers are selected to need to retransmit.
Particularly, the inspection method whether the multichannel frame losing loses is as follows: the recipient preserves the frame number of the Frame of the last frame of receiving each physical channel, when receiving non-expectation frame, relatively whether the frame number of these preservations has all crossed expectation frame number (after the expectation frame number), if, judge that then the expectation frame is lost, otherwise do not think that then the expectation frame loses.
In order to improve the selectivity efficiency of retransmission, improve the speed that the recipient judges that frame losing takes place, in the LAPD agreement, can increase Negative Acknowledgement timer (REJ timer).The Negative Acknowledgement timer is used for picking up counting when sliding window is received non-expectation frame receiving, if overtime then judge the expectation LOF, send Negative Acknowledgement frame (REJ frame) to transmit leg simultaneously and initiatively requires transmit leg to retransmit to expect frame.
The Frame processing mode of receiving terminal specifically may further comprise the steps as shown in Figure 1 in the embodiment of the invention:
Judge at first whether the REJ timer is opened, if, then close the REJ timer after, execution in step 103 again; Otherwise, direct execution in step 103.
After step 103, affirmation are removed the REJ sign, execution in step 104;
Judge at first whether REJ sign is set up, if, then remove the REJ sign after, execution in step 104 again; Otherwise, direct execution in step 104.
If beyond sliding window scope, illustrate that this frame is an abnormal frame, then abandon this frame, and expect the frame number of frame, but do not need to retransmit this expectation frame by sending RR frame notice transmit leg.
Can whether lose by multichannel frame losing detection method inspection expectation frame mentioned above; And can check in conjunction with the REJ timer, for example guarantee when sliding window is received non-expectation frame that the REJ timer is opened and (receiving that first non-expectation frame began before receiving the expectation frame receiving, remaining the REJ timer opens), if overtime, then judge the expectation LOF.
Step 100 after confirming to open the REJ timer, is got back in step 110～111, carries out the reception of Frame;
Judge at first whether the REJ timer is opened, if then directly get back to step 100; Otherwise, behind the unlatching REJ timer, return step 100.
Step 112 checks whether the REJ sign is set up, if then directly get back to step 100; Otherwise, carry out 113;
Whether the REJ sign is used for identifying the REJ frame and is sent out, if, the REJ sign then can be set, avoid repeating to send the REJ frame.
Step 113 directly sends Negative Acknowledgement frame REJ frame to transmit leg, and REJ sign, execution in step 114 are set;
Confirm then to close the REJ timer, get back to step 100.
Step 100 after confirming to close the REJ timer, is got back in step 114～115, carries out the reception of Frame;
Judge at first whether the REJ timer is opened, if, then close the REJ timer after, return step 100; Otherwise, directly get back to step 100.
If be to adopt REJ timer inspection expectation frame whether to lose separately in the step 109, do not need then to judge again whether the REJ timer closes, because behind the REJ timer expiry, can close automatically.
Claims (9)
1. a D channel link access regulation implementation method is characterized in that, the D channel link access regulation is the carryings of many physical channels of LAPD chain route, and a passage bunch is formed in the set that is used to carry the physical channel of a LAPD link; Real-time up-downgoing communication failure being carried out in passage bunch every the physical channel that is comprised detect, before each transmission LAPD link data frame, is that this Frame is selected a transmission in the available physical channel according to testing result.
2. the method for claim 1 is characterized in that,
The size of the sliding window of the reception that described LAPD link uses is at least greater than the number of physical channel in the described passage bunch.
3. the method for claim 1 is characterized in that, in the following manner real-time up-downgoing communication failure is carried out in the physical channel and detects:
The regular transmit status frame of the communication two party of each physical channel is given the other side, if receive the other side's status frames in the duration of setting, judges that then the receive direction of this physical channel can be used;
Comprise transmit leg current time and time difference in the described status frames,, judge that then the sending direction of this physical channel can be used if the value of the time difference in the status frames is in the preset threshold scope from moment of this last received frame in physical channel.
4. as claim 1 or 3 described methods, it is characterized in that,
When selecting available physical channel for the Frame that sends, judge the minimum passage of load by the load query interface of plate level support package, be implemented in the available physical channel and select the most idle passage for it.
5. the method for claim 1 is characterized in that,
Whether the receiving terminal of described LAPD link carries out buffer memory to the non-expectation frame of receiving when receiving non-expectation frame, and check expectation frame buffer memory, if then find corresponding expectation frame from buffer memory; If the expectation frame is lost, then send the Negative Acknowledgement frame to transmit leg;
After the transmitting terminal of described LAPD link is received above-mentioned Negative Acknowledgement frame, select corresponding Frame to retransmit according to the frame number of the expectation frame that wherein comprises.
6. as claim 1 or 5 described methods, it is characterized in that the receiving terminal of described LAPD link carries out the processing of following steps to the Frame that receives:
When (a) receiving terminal is received Frame, whether be that the frame number of expectation frame judges whether it is the expectation frame according to the frame number of this Frame, if, then carry out next step, otherwise, think that this Frame is non-expectation frame, execution in step (c);
(b) will expect that frame sends to upper layer application, and will expect that the frame number of frame adds up backward, again execution in step (d);
(c) judge that this non-expectation frame is whether in receiving the cunning window, if then this non-expectation frame is carried out buffer memory; Otherwise, abandon this non-expectation frame, and send acknowledgement frame to transmit leg, get back to step (a);
(d) check the receiving terminal expectation frame whether buffer memory is new, if, execution in step (b) then, otherwise, get back to step (a).
7. method as claimed in claim 6 is characterized in that, in the step (c),
When non-expectation frame is carried out buffer memory, check whether the expectation frame is lost, if, then send the Negative Acknowledgement frame to transmit leg, in the Negative Acknowledgement frame, comprise the frame number of expecting frame.
8. method as claimed in claim 7 is characterized in that, checks in the following manner whether the expectation frame is lost:
Receiving terminal is preserved the frame number of the Frame of the last frame of receiving each physical channel, and when receiving non-expectation frame, relatively whether the frame number of these preservations has all surpassed the frame number of expectation frame, if judge that then the expectation frame loses.
9. method as claimed in claim 7 is characterized in that,
The receiving terminal of described LAPD link starts the Negative Acknowledgement timer and picks up counting when receiving non-expectation frame, if exceed the timing cycle of this Negative Acknowledgement timer, judges that then the expectation frame loses.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810007721XA CN101237406B (en) | 2008-02-29 | 2008-02-29 | A realization method for D channel link access regulation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810007721XA CN101237406B (en) | 2008-02-29 | 2008-02-29 | A realization method for D channel link access regulation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101237406A CN101237406A (en) | 2008-08-06 |
| CN101237406B true CN101237406B (en) | 2011-12-07 |
Family
ID=39920772
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200810007721XA Expired - Fee Related CN101237406B (en) | 2008-02-29 | 2008-02-29 | A realization method for D channel link access regulation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101237406B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101651994B (en) * | 2009-08-27 | 2012-01-11 | 中兴通讯股份有限公司 | Method for realizing link collocation of Link Access Procedure on D channel and base station thereof |
| CN102404098B (en) * | 2010-09-14 | 2015-01-07 | 中兴通讯股份有限公司 | Transmission method and transmission device of link access procedure of D channel |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1273472A (en) * | 1999-05-10 | 2000-11-15 | 深圳市华为技术有限公司 | Maintenance and management method for user access network |
| US6944129B1 (en) * | 2000-06-19 | 2005-09-13 | Avaya Technology Corp. | Message format and flow control for replacement of the packet control driver/packet interface dual port RAM communication |
| CN1671225A (en) * | 2004-03-16 | 2005-09-21 | 华为技术有限公司 | Method for judging broken link of Link Access Procedure on D-channel (LAPD) |
| CN101043393A (en) * | 2006-05-19 | 2007-09-26 | 华为技术有限公司 | Method for channel allocation in QSIG system |
-
2008
- 2008-02-29 CN CN200810007721XA patent/CN101237406B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1273472A (en) * | 1999-05-10 | 2000-11-15 | 深圳市华为技术有限公司 | Maintenance and management method for user access network |
| US6944129B1 (en) * | 2000-06-19 | 2005-09-13 | Avaya Technology Corp. | Message format and flow control for replacement of the packet control driver/packet interface dual port RAM communication |
| CN1671225A (en) * | 2004-03-16 | 2005-09-21 | 华为技术有限公司 | Method for judging broken link of Link Access Procedure on D-channel (LAPD) |
| CN101043393A (en) * | 2006-05-19 | 2007-09-26 | 华为技术有限公司 | Method for channel allocation in QSIG system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101237406A (en) | 2008-08-06 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101421964B (en) | Method and apparatus for transmitting and receiving status report in a mobile communication system | |
| CN106130701B (en) | HARQ process transmission method and device, base station and terminal in unauthorized frequency range | |
| KR100731964B1 (en) | Apparatus, and associated method, for facilitating retransmission of data packets in a packet radio communication system that utilizes a feedback acknowledgment scheme | |
| US8036101B2 (en) | Retransmission apparatus and method for high-speed data processing | |
| US7940771B2 (en) | Apparatus and method for requesting packet retransmission in a wireless communication system | |
| CN101444032B (en) | Retransmission apparatus and method for high-speed data processing | |
| US8331269B2 (en) | Method and device for transmitting voice in wireless system | |
| CN101030842B (en) | Method and apparatus for rearranging data in mobile telecommunication system | |
| CN102740403B (en) | Method and apparatus for access in terminal of communication network | |
| CN101223759A (en) | Transmission device, receiving device and information communication method | |
| WO2007037655A1 (en) | Method and apparatus for retransmitting packet in a mobile communication system, and system thereof | |
| WO2007129872A1 (en) | Retransmission apparatus and method for high-speed data processing | |
| US7110418B2 (en) | Method to ensure the quality of preferred communication services, a local network, a station, a local network controller and a program module therefor | |
| HUE028291T2 (en) | Method and apparatus in a telecommunication system | |
| CN101009536B (en) | Status report method of automatic retransfer request | |
| Susitaival et al. | LTE coverage improvement by TTI bundling | |
| CN101779394B (en) | It is used for the apparatus and method discontinuously received in mobile communication system | |
| CN101237406B (en) | A realization method for D channel link access regulation | |
| CN1264234A (en) | Priority enhanced information transfer device and its method | |
| CN100405785C (en) | Method for processing of double layer channel protocol message and apparatus thereof | |
| CN101772194B (en) | General packet radio service tunnel user plane path keep-alive method and system | |
| CN100356750C (en) | Flow control method for synchronous digital system network transmission data business | |
| CN101631074B (en) | Multilink message sending method, device and network equipment | |
| CN113541874A (en) | Data transmission method and network equipment | |
| KR970002818B1 (en) | Data flow control method of packet relay call |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20111207 Termination date: 20180229 |