CN102118192B - Frame selection method and device - Google Patents
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- CN102118192B CN102118192B CN201110040965.XA CN201110040965A CN102118192B CN 102118192 B CN102118192 B CN 102118192B CN 201110040965 A CN201110040965 A CN 201110040965A CN 102118192 B CN102118192 B CN 102118192B
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Abstract
The invention provides a frame selection method and a frame selection device, which are used in the situation of Abis interface link delay jitter in a code division multiple access (CDMA) system. The method comprises the following steps that: when an Abis interface link delay jitters, a base station controller (BSC) determines a maximum delay of an Abis interface link transmission frame and computes a first number of frames needing to be buffered currently according to the maximum delay; the BSC adjusts a second number of the frames carrying data which can be stored in a buffering area of the BSC according to the first number; and when the number of the frames carrying the data stored in the buffering area of the BSC reaches the second number, the BSC selects the frames carrying the data which meets an upper service from the frames carrying the stored data, and transmits the frames to the upper service. The method and the device can solve problems.
Description
Technical field
The present invention relates to the communications field, in particular to a kind of frame selecting method and device.
Background technology
At CDMA (Code Division Multiple Access, code division multiple access) there is multiple switching Handoff type in field, wherein there is a kind of soft handover Soft HandOff, its general principle is in same BSC (Base StationController when travelling carriage, base station controller) control under adjacent BTS (Base transceiver station, base station transceiver) between region time, travelling carriage is maintenance and source BTS wireless connections while, set up wireless connections with target BTS again, discharge the wireless connections with source BTS more afterwards.It serves the diversity effect of Traffic Channel at the intersection of two BS (Base Station, the base station) area of coverage, can greatly reduce like this owing to switching the call drop caused.Because according to this toward the test statistics to analogue system TDMA, on wireless channel, the call drop of 90% occurs in handoff procedure.After realizing soft handover, switch and cause the probability of call drop greatly to reduce, ensure that the reliability of communication.A connection between this BSC, BTS, MS (Mobile Station, mobile base station), is referred to as leg Leg.Interface between BTS and BTS, is called Abis mouth.Due in handoff procedure, do not disconnect original connection, so BSC may can receive the frame Frame data that many legs decode out, need synchronization, the frame data that different leg decodes out compare, and select the decoding data that top-quality frame carries.
In actual applications, the general a good distance off of BSC and BTS, so need between BSC and BTS to be coupled together by engineering construction wiring.In system in early days, the two is connected by E1/T1 line, and the interface of E1/T1 line is time-multiplexed interface, link can not be formed congested, and time delay is also very little, is fixing.Along with the evolution of technology, the mobile communication system direction evolution changed to IP (Internet Protocol, Internet Protocol) slowly, also progressively become between BSC and BTS IP connect.IP system does not guarantee service quality, thus time delay, shake than E1/T1 connect larger.
The reverse frames data transmission method for uplink of cdma system be BTS at regular intervals (as 20ms) send a frame, after the selection Dispatching Unit SDU of BSC receives, (as 20ms) selects best frame from different leg equally at regular intervals, sends to the corresponding target of data after decoding.
Because cdma system has soft handover, so just create a problem in BSC with BTS of IPization is connected: when the delay jitter on different leg is inconsistent, the time possibility that frame data on different leg arrive BSC is inconsistent, when BSC may be caused to select frame, what compare is not the frame data that same moment BTS decodes out, thus causes out of order, frame losing, the situation such as to repeat.This can have a strong impact on the quality of voice call and the speed of data service.
For the situation of link delay shake, general processing method increases buffering area.Increase the problem cushioning and really can solve delay variation and cause selecting frame confusion.But for speech business, after increase buffering area undesirably increases the delay of voice; To data service, buffering area adds the time of data on link, when there being free slip of the tongue frame, is easy to cause data re-transmission, thus reduces the speed of data service.So the method for fixing buffering has obvious defect here.
Link delay jitter is solved for adopting the method for fixing buffering in correlation technique, for speech business, increase the delay that buffering area undesirably increases voice, for data service, buffering area adds the time of data on link, when there being free slip of the tongue frame, is easy to cause data re-transmission, thus reduce the problem of the speed of data service, at present effective solution is not yet proposed.
Summary of the invention
The present invention aims to provide a kind of frame selecting method and device, the method of fixing buffering is adopted to solve link delay jitter to solve in correlation technique, for speech business, increase the delay that buffering area undesirably increases voice, for data service, buffering area adds the time of data on link, when there being free slip of the tongue frame, be easy to cause data re-transmission, thus reduce the problem of the speed of data service.
According to an aspect of the present invention, provide a kind of frame selecting method, be applied to the situation of Abis interface link delay shake in CDMA systems, the method comprises: during described Abis interface link delay shake, base station controller BSC determines the maximum delay of described Abis interface link transmission frame, and calculates according to described maximum delay the first number that current needs carry out the frame cushioned; Described BSC is according to the second number of the frame of the data that can store in the buffering area of the described BSC of described first number adjustment carrying; When the number of the frame carrying the data stored in the buffering area of described BSC reaches described second number, described BSC selects carrying to meet the frame of the data of upper-layer service in the frame carrying the data stored, and is sent to described upper-layer service.
Preferably, described BSC determines the maximum delay of described Abis interface link transmission frame, comprising: in present frame selection course, and described BSC receives the data that base station transceiver BTS sends at least one frame; For each frame, described BSC receives the current global position system GPS Time Calculation of this frame according to the frame number of this frame and described BSC and goes out the gps time that described BTS sends this frame; And the gps time that more described BSC is current and described BTS send the gps time of this frame, obtain the time delay of Abis interface link corresponding to this frame; The time delay of the Abis interface link that described BSC at least one frame relatively more described is corresponding, determines described maximum delay.
Preferably, described BSC selects carrying to meet the frame of the data of upper-layer service in the frame carrying the data stored, and be sent to described upper-layer service, comprise: described BSC calculates according to the number of the frame of the Current GPS time of described BSC and described needs buffering the frame number of frame selected, and selects corresponding frame to be sent to described upper-layer service according to described frame number.
Preferably, described BSC selects corresponding frame to be sent to described upper-layer service according to described frame number, comprising: described BSC judges whether have frame corresponding to described frame number in described buffering area; If so, the frame that the frame that the described frame number had in the more described buffering area of described BSC is corresponding is corresponding with the described frame number received, selects top-quality frame for decoding; If not, described BSC compares frame corresponding to the described frame number that receives, selects top-quality frame for decoding.
Preferably, when the number of the frame carrying the data stored in the buffering area of described BSC reaches described second number, described BSC selects carrying to meet the frame of the data of upper-layer service in the frame carrying the data stored, and be sent to described upper-layer service, comprise: when before described second number is greater than once the shake of described Abis interface link delay time described buffer area in store the number of the frame of needs buffering time, treat that the number of the frame stored in described buffering area reaches described second number, described BSC selects carrying to meet the frame of the data of upper-layer service in the frame carrying the data stored, and be sent to described upper-layer service, or when before described second number is less than once the shake of described Abis interface link delay time described buffer area in store the number of the frame of needs buffering time, described BSC is now engraved in the frame of the data that carrying has stored and selects carrying to meet the frame of the data of upper-layer service, and is sent to described upper-layer service.
Preferably, when before described second number is less than once the shake of described Abis interface link delay time described buffer area in store the number of the frame of needs buffering time, described BSC is now engraved in the frame of the data that carrying has stored and selects carrying to meet the frame of the data of upper-layer service, and be sent to described upper-layer service, comprise: when described upper-layer service be data service and when before described second number is less than once the shake of described Abis interface link delay time described buffer area in store the number of the frame of needs buffering time, described BSC is now engraved in the frame of described storage and selects the frame meeting business to be sent to described upper-layer service, when described upper-layer service be speech business and when before described second number is less than once the shake of described Abis interface link delay time described buffer area in store the number of the frame of needs buffering time, this moment of described BSC only selects the frame of demand fulfillment business to be sent to described upper-layer service according to this result of calculation, discards by the frame selected before this calculating with according to this frame calculating the interframe selected.
Preferably, described BSC is according to the second number of the frame of the data that can store in the buffering area of the described BSC of described first number adjustment carrying, comprise: when described first number is double be all greater than before once the shake of described Abis interface link delay time described buffer area in store the number of the frame of needs buffering time, described BSC increases described second number; When described first number is double be all less than before once the shake of described Abis interface link delay time described buffer area in store the number of the frame of needs buffering time, described BSC reduces described second number.
Preferably, the number of the frame stored in the buffering area of described BSC comprises after reaching described second number: the frame arrived after described BSC abandons.
According to a further aspect in the invention, provide a kind of frame choice device, be integrated in base station controller BSC, comprise: determination module, during for described Abis interface link delay shake, determine the maximum delay of described Abis interface link transmission frame, and calculate according to described maximum delay the first number that current needs carry out the frame cushioned; Adjusting module, for the second number of the frame according to the data that can store in the buffering area of the described BSC of described first number adjustment carrying; Select module, for when the number of the frame carrying the data stored in the buffering area of described BSC reaches described second number, in the frame carrying the data stored, select carrying to meet the frame of the data of upper-layer service, and be sent to described upper-layer service.
Preferably, described determination module comprises: receive submodule, in present frame selection course, receives the data that base station transceiver BTS sends at least one frame; Calculating sub module, for for each frame, receives the current global position system GPS Time Calculation of this frame according to the frame number of this frame and described BSC and goes out the gps time that described BTS sends this frame; And the gps time that more described BSC is current and described BTS send the gps time of this frame, obtain the time delay of Abis interface link corresponding to this frame; Determine submodule, for the time delay of Abis interface link corresponding at least one frame relatively described, determine described maximum delay.
Preferably, described selection module also for calculating the frame number of the frame selected according to the number of the Current GPS time of described BSC and the frame of described needs buffering, selects corresponding frame to be sent to described upper-layer service according to described frame number.
Preferably, described selection module comprises: judge submodule, whether has frame corresponding to described frame number for judging in described buffering area; First chooser module, if for described judge the judged result of submodule as being time, frame corresponding to the described frame number had in more described buffering area and frame corresponding to the described frame number received, select top-quality frame for decoding; Second chooser module, if when being no for the judged result of described judgement submodule, comparing the frame that the described frame number that receives is corresponding, selects top-quality frame for decoding.
Preferably, described selection module also for when before described second number is greater than once the shake of described Abis interface link delay time described buffer area in store the number of the frame of needs buffering time, treat that the number of the frame stored in described buffering area reaches described second number, in the frame carrying the data stored, select carrying to meet the frame of the data of upper-layer service, and be sent to described upper-layer service; Or, when before described second number is less than once the shake of described Abis interface link delay time described buffer area in store the number of the frame of needs buffering time, now be engraved in the frame of the data that carrying has stored and select carrying to meet the frame of the data of upper-layer service, and be sent to described upper-layer service.
Preferably, described selection module also for be data service when described upper-layer service and when before described second number is less than once the shake of described Abis interface link delay time described buffer area in store the number of the frame of needs buffering time, be now engraved in the frame of described storage and select the frame meeting business to be sent to described upper-layer service; When described upper-layer service be speech business and when before described second number is less than once the shake of described Abis interface link delay time described buffer area in store the number of the frame of needs buffering time, this moment only selects the frame of demand fulfillment business to be sent to described upper-layer service according to this result of calculation, discards by the frame selected before this calculating with according to this frame calculating the interframe selected.
Preferably, described adjusting module comprises: increase submodule, for when described first number is double be all greater than before once the shake of described Abis interface link delay time described buffer area in the number of the frame that cushions of the needs that store time, increase described second number; Reduce submodule, for when described first number is double be all less than before once the shake of described Abis interface link delay time described buffer area in the number of the frame that cushions of the needs that store time, reduce described second number.
In embodiments of the present invention, during the shake of Abis interface link delay, BSC determines the maximum delay of Abis interface link transmission frame, and calculate according to maximum delay the first number that current needs carry out the frame cushioned, and then carry the second number of the frame of the data that can store in the buffering area of BSC according to the first number adjustment; When the number of the frame carrying the data stored in the buffering area of BSC reaches the second number, BSC selects carrying to meet the frame of the data of upper-layer service in the frame carrying the data stored, and is sent to upper-layer service.Namely, during the shake of Abis interface link delay, BSC can according to the second number of the frame of the data that can store in the buffering area of the maximum delay dynamic conditioning BSC of Abis interface link transmission frame, namely BSC can according to the size of maximum delay dynamic conditioning buffering area, if current needs less buffering area, then can avoid using excessive buffering area, cause the voice latency of speech business or increase time on link of the data of data service and easily cause the problem of data re-transmission, solve the obvious defect that the business caused buffering area is fixed in the employing mentioned in correlation technique.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide a further understanding of the present invention, and form a application's part, schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the process chart of the frame selecting method according to the embodiment of the present invention;
Fig. 2 is the model schematic of traffic frame that in the cdma system soft handover according to the embodiment of the present invention, BTS sends mobile terminal to the SDU of BSC;
Fig. 3 is the implementation method flow chart according to the frame selecting method under the Abis mouth link long time delay jitter conditions of the embodiment of the present invention;
Fig. 4 is the structural representation of the frame choice device according to the embodiment of the present invention;
Fig. 5 is the structural representation of the determination module according to the embodiment of the present invention;
Fig. 6 is the structural representation of the selection module according to the embodiment of the present invention;
Fig. 7 is the structural representation of the adjusting module according to the embodiment of the present invention.
Embodiment
Below with reference to the accompanying drawings and in conjunction with the embodiments, describe the present invention in detail.
Hereinafter also describe the present invention in detail with reference to accompanying drawing in conjunction with the embodiments.It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combine mutually.
Mention in correlation technique, for the situation of link delay shake, general processing method increases buffering area.Increase the problem cushioning and really can solve delay variation and cause selecting frame confusion.But for speech business, after increase buffering area undesirably increases the delay of voice; To data service, buffering area adds the time of data on link, when there being free slip of the tongue frame, is easy to cause data re-transmission, thus reduces the speed of data service.So the method for fixing buffering has obvious defect here.
For solving the problems of the technologies described above, embodiments provide a kind of frame selecting method, be applied to the situation of Abis interface link delay shake in CDMA systems, as shown in Figure 1, the method comprises its handling process:
During the shake of step S102, Abis interface link delay, the maximum delay of base station controller BSC determination Abis interface link transmission frame, and calculate according to maximum delay the first number that current needs carry out the frame cushioned;
Step S104, BSC are according to the second number of the frame of the data that can store in the buffering area of the first number adjustment carrying BSC;
Step S106, when the number carrying the frame of data stored in the buffering area of BSC reaches the second number, BSC selects carrying to meet the frame of the data of upper-layer service in the frame carrying the data stored, and is sent to upper-layer service.
In embodiments of the present invention, during the shake of Abis interface link delay, BSC determines the maximum delay of Abis interface link transmission frame, and calculate according to maximum delay the first number that current needs carry out the frame cushioned, and then carry the second number of the frame of the data that can store in the buffering area of BSC according to the first number adjustment; When the number of the frame carrying the data stored in the buffering area of BSC reaches the second number, BSC selects carrying to meet the frame of the data of upper-layer service in the frame carrying the data stored, and is sent to upper-layer service.Namely, during the shake of Abis interface link delay, BSC can according to the second number of the frame of the data that can store in the buffering area of the maximum delay dynamic conditioning BSC of Abis interface link transmission frame, namely BSC can according to the size of maximum delay dynamic conditioning buffering area, if current needs less buffering area, then can avoid using excessive buffering area, cause the voice latency of speech business or increase time on link of the data of data service and easily cause the problem of data re-transmission, solve the obvious defect that the business caused buffering area is fixed in the employing mentioned in correlation technique.
Flow process as shown in Figure 1, step S102 is when implementing, and BSC determines that the maximum delay of Abis interface link transmission frame can have multiple implementation, such as, can careless picking frame, calculate its time delay, it can be used as maximum delay, also several frames can be selected to carry out the calculating of time delay, select maximum wherein as maximum delay, in order to the accuracy calculated, preferably, all can carry out time-delay calculation to all frames, get maximum as maximum delay, handling process is as follows:
Steps A, in present frame selection course, BSC receives the data that send at least one frame of BTS;
Step B, for each frame, BSC receives the current GPS of this frame (GlobalPositioning System, global positioning system) Time Calculation according to the frame number of this frame and BSC and goes out the gps time that BTS sends this frame; And, compare the gps time that the current gps time of BSC and BTS send this frame, obtain the time delay of Abis interface link corresponding to this frame;
Step C, BSC compare the time delay of Abis interface link corresponding at least one frame, determine maximum delay.
BSC selects carrying to meet the frame of the data of upper-layer service in the frame carrying the data stored, and be sent to upper-layer service, such as, BSC and can need the number of the frame of buffering to calculate the frame number of the frame selected according to the Current GPS time of BSC, selects corresponding frame to be sent to upper-layer service according to frame number.Model as shown in Figure 2, in cdma wireless communication system, when soft handover, communication link is set up in travelling carriage and multiple base station, the reverse signal of each BTS receiving mobile, BTS1, BTS2, BTS3 receive the signal from travelling carriage, and 3 base stations all demodulate signal, 3 base stations all send to reverse traffic frame to the SDU of BSC, with frame number in reverse traffic frame, base station calculates the frame number sending traffic frame according to gps time, and traffic frame is sent to SDU.
BSC selects corresponding frame to be sent to upper-layer service according to frame number, first, BSC judges whether have frame corresponding to frame number in buffering area, if, then BSC needs to compare frame corresponding to the frame number that had in buffering area and frame corresponding to the frame number that receives, selects top-quality frame for decoding, if not, then BSC only needs to compare frame corresponding to the frame number that receives, selects top-quality frame for decoding.Adopt above-mentioned frame selection mode can select in existing all frames, avoid the situation occurring that the good frame of signal quality is missed, and then ensure speech quality.
When the number of the frame carrying the data stored in the buffering area of BSC reaches the second number, BSC selects carrying to meet the frame of the data of upper-layer service in the frame carrying the data stored, and be sent to upper-layer service, but, usual second number can have two kinds of situations, a kind of is the number of the frame of the needs buffering stored in buffer area when being greater than the shake of front Abis interface link delay, another is the number of the frame of the needs buffering stored in buffer area when being less than front Abis interface link delay shake, situation is different, the mode of process is also different, the processing mode that the embodiment of the present invention provides is as follows:
When the second number is greater than the number of the frame of the needs buffering stored in buffer area when a front Abis interface link delay is shaken, the number of the frame stored in district to be buffered reaches the second number, BSC selects carrying to meet the frame of the data of upper-layer service in the frame carrying the data stored, and is sent to upper-layer service;
When the second number is less than the number of the frame of the needs buffering stored in buffer area when a front Abis interface link delay is shaken, BSC is now engraved in the frame of the data that carrying has stored and selects carrying to meet the frame of the data of upper-layer service, and is sent to upper-layer service.
Mention above, business generally includes data service and speech business, and for dissimilar business, the operation of BSC is also distinguishing:
When being data service when upper-layer service and being less than the number of the frame of the needs buffering stored in buffer area when a front Abis interface link delay is shaken when the second number, BSC is now engraved in the frame of storage and selects the frame meeting business to be sent to upper-layer service;
When being speech business when upper-layer service and being less than the number of the frame of the needs buffering stored in buffer area when a front Abis interface link delay is shaken when the second number, this moment of BSC only selects the frame of demand fulfillment business to be sent to upper-layer service according to this result of calculation, discards by the frame selected before this calculating with according to this frame calculating the interframe selected.
That is, the number of frames of buffering is needed to situation about increasing, then having needs to wait for that some moment are waited until and carries out selecting frame after buffered frame quantity reaches result of calculation again; Number of frames for buffering needs situation about reducing, then this moment of data service is needed to select multiple frame and send to upper-layer service, to reduce buffering not losing data again, for voice, because voice are insensitive to instantaneous speech LOF, the frame that this moment only selects this moment to need according to new result of calculation to select, needs the frame selected and needs the Frame between the frame selected to discard after calculating before calculating
During enforcement, in order to overcome the frequent adjustment owing to shaking the buffering quantity caused, filter needing the number of frames result of calculation of buffering: double result of calculation is all need to reduce, just reduce the number of frames of buffering; Double result of calculation is all need to increase, and just increases the number of frames of buffering.For the frame arrived after exceeding buffering range, abandon, do not participate in frame and select.
Change angle, that is, when the first number is double be all greater than a front Abis interface link delay shake time buffer area in store the number of the frame of needs buffering time, BSC increases the second number; When the first number is double be all less than the shake of front Abis interface link delay time buffer area in store the number of the frame of needs buffering time, BSC reduces the second number.
For the frame arrived after exceeding buffering range, the frame that the number of the frame stored in the buffering area of BSC in other words arrives after reaching the second number, is abandoned, is not participated in frame and select.
For the frame selecting method embodiment of the present invention provided is explained clearer clearer, Fig. 3 provides the implementation method flow chart of the frame selecting method under Abis mouth link long time delay jitter conditions.
After the SDU of step S302, BSC receives the traffic frame of BTS, the frame data on each bar leg of circular treatment, what calculate BTS to the frame on every bar leg according to the gps time of frame number and BSC sends out frame time;
Step S304, compare the time that BSC gps time and BTS send out frame, calculate time delay;
Step S306, the leg getting maximum delay are used for calculating the frame number number that cushion: time delay removes every frame period time 20ms, draw the frame number needing buffering, and compare with current buffering frame number;
Step S308, judge whether continuous 2 processing times be all to increase buffering frame number or reduce buffering frame number;
If step S310 just occurs once needing to increase or reduce buffering once in a while, so think the accidental fluctuation of link, do not process, abandon the frame exceeding buffering range, the frame that other frames continue to participate in step S314 is selected;
If the result of calculation in step S312 continuous 2 processing times is all to increase or to reduce buffering, so think the variation tendency of link, increase buffering frame number according to result of calculation or reduce buffering frame number;
Herein also will according to new buffering frame number, what calculating made new advances selects frame frame number.For the situation reducing buffering frame number, because needs reduce buffering frame number, so this process moment, will have multiple frame needs to process, and for speech business, directly can arrange the new frame frame number that selects is currently select frame frame number, abandons other frames; For data service, can frame frame number be selected to select the frame between frame frame number to be all set to the current frame number that will select to this last time, avoid the loss of data;
Step S314, each frame of cycle criterion, if the current frame number that will select, so jump to step S318, otherwise enter step S316 process;
Step S316, if not the current frame number that will select, be so put in buffering area and go, by the time select the frame moment to arrive and select again;
Step S318 is if the current frame number that will select, and so all frames of current this frame number received, and these frame numbers all in buffering area take out together, select.
Based on same inventive concept, the embodiment of the present invention additionally provides a kind of frame choice device, and its structural representation as shown in Figure 4, is integrated in base station controller BSC, comprises:
Determination module 401, when shaking for Abis interface link delay, determines the maximum delay of Abis interface link transmission frame, and calculates according to maximum delay the first number that current needs carry out the frame cushioned;
Adjusting module 402, for the second number of the frame according to the data that can store in the buffering area of the first number adjustment carrying BSC;
Select module 403, for when the number of the frame carrying the data stored in the buffering area of BSC reaches the second number, in the frame carrying the data stored, select carrying to meet the frame of the data of upper-layer service, and be sent to upper-layer service.
In one embodiment, as shown in Figure 5, determination module 401 can comprise:
Receive submodule 501, in present frame selection course, receive the data that base station transceiver BTS sends at least one frame;
Calculating sub module 502, for for each frame, receives the current global position system GPS Time Calculation of this frame according to the frame number of this frame and BSC and goes out the gps time that BTS sends this frame; And, compare the gps time that the current gps time of BSC and BTS send this frame, obtain the time delay of Abis interface link corresponding to this frame;
Determining submodule 503, for comparing the time delay of Abis interface link corresponding at least one frame, determining maximum delay.
In one embodiment, the number selecting module 403 can also be used for the frame cushioned according to Current GPS time and the needs of BSC calculates the frame number of the frame selected, and selects corresponding frame to be sent to upper-layer service according to frame number.
In one embodiment, as shown in Figure 6, module 403 is selected to comprise:
Judging submodule 601, for judging, whether there is in buffering area frame corresponding to frame number;
First chooser module 602, if for judging the judged result of submodule as being time, compare frame corresponding to the frame number that had in buffering area and frame corresponding to the frame number that receives, select top-quality frame for decoding;
Second chooser module 603, if when the judged result for judging submodule is no, compares the frame that the frame number that receives is corresponding, selects top-quality frame for decoding.
In one embodiment, when selecting module 403 can also be used for the number of the frame of the needs buffering stored in buffer area when the second number is greater than front Abis interface link delay shake, the number of the frame stored in district to be buffered reaches the second number, in the frame carrying the data stored, select carrying to meet the frame of the data of upper-layer service, and be sent to upper-layer service; Or, when the second number is less than the number of the frame of the needs buffering stored in buffer area when a front Abis interface link delay is shaken, now be engraved in the frame of the data that carrying has stored and select carrying to meet the frame of the data of upper-layer service, and be sent to upper-layer service.
In one embodiment, when selecting module 403 can also be used for being data service when upper-layer service and be less than the number of the frame of the needs buffering stored in buffer area when a front Abis interface link delay is shaken when the second number, be now engraved in the frame of storage and select the frame meeting business to be sent to upper-layer service; When being speech business when upper-layer service and being less than the number of the frame of the needs buffering stored in buffer area when a front Abis interface link delay is shaken when the second number, this moment only selects the frame of demand fulfillment business to be sent to upper-layer service according to this result of calculation, discards by the frame selected before this calculating with according to this frame calculating the interframe selected.
In one embodiment, as shown in Figure 7, adjusting module 402 can comprise:
Increase submodule 701, for when the first number is double be all greater than the shake of front Abis interface link delay time buffer area in the number of the frame that cushions of the needs that store time, increase the second number;
Reduce submodule 702, for when the first number is double be all less than the shake of front Abis interface link delay time buffer area in the number of the frame that cushions of the needs that store time, reduce the second number.
In embodiments of the present invention, during the shake of Abis interface link delay, BSC determines the maximum delay of Abis interface link transmission frame, and calculate according to maximum delay the first number that current needs carry out the frame cushioned, and then carry the second number of the frame of the data that can store in the buffering area of BSC according to the first number adjustment; When the number of the frame carrying the data stored in the buffering area of BSC reaches the second number, BSC selects carrying to meet the frame of the data of upper-layer service in the frame carrying the data stored, and is sent to upper-layer service.Namely, during the shake of Abis interface link delay, BSC can according to the second number of the frame of the data that can store in the buffering area of the maximum delay dynamic conditioning BSC of Abis interface link transmission frame, namely BSC can according to the size of maximum delay dynamic conditioning buffering area, if current needs less buffering area, then can avoid using excessive buffering area, cause the voice latency of speech business or increase time on link of the data of data service and easily cause the problem of data re-transmission, solve the obvious defect that the business caused buffering area is fixed in the employing mentioned in correlation technique.
Obviously, those skilled in the art should be understood that, above-mentioned of the present invention each module or each step can realize with general calculation element, they can concentrate on single calculation element, or be distributed on network that multiple calculation element forms, alternatively, they can realize with the executable program code of calculation element, thus they storages can be performed by calculation element in the storage device, or they are made into each integrated circuit modules respectively, or the multiple module in them or step are made into single integrated circuit module to realize.Like this, the present invention is not restricted to any specific hardware and software combination.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.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 (14)
1. a frame selecting method, is characterized in that, be applied to the situation of Abis interface link delay shake in CDMA systems, the method comprises:
During described Abis interface link delay shake, base station controller BSC determines the maximum delay of described Abis interface link transmission frame, and calculates according to described maximum delay the first number that current needs carry out the frame cushioned;
Described BSC is according to the second number of the frame of the data that can store in the buffering area of the described BSC of described first number adjustment carrying;
When the number of the frame carrying the data stored in the buffering area of described BSC reaches described second number, described BSC selects carrying to meet the frame of the data of upper-layer service in the frame carrying the data stored, and is sent to described upper-layer service;
Wherein, described BSC, according to the second number of the frame of the data that can store in the buffering area of the described BSC of described first number adjustment carrying, comprising:
When described first number is double be all greater than before once the shake of described Abis interface link delay time described buffering area in store the number of the frame of needs buffering time, described BSC increases described second number;
When described first number is double be all less than before once the shake of described Abis interface link delay time described buffering area in store the number of the frame of needs buffering time, described BSC reduces described second number.
2. method according to claim 1, is characterized in that, described BSC determines the maximum delay of described Abis interface link transmission frame, comprising:
In present frame selection course, described BSC receives the data that base station transceiver BTS sends at least one frame;
For each frame, described BSC receives the current global position system GPS Time Calculation of this frame according to the frame number of this frame and described BSC and goes out the gps time that described BTS sends this frame; And the gps time that more described BSC is current and described BTS send the gps time of this frame, obtain the time delay of Abis interface link corresponding to this frame;
The time delay of the Abis interface link that described BSC at least one frame relatively more described is corresponding, determines described maximum delay.
3. method according to claim 2, is characterized in that, described BSC selects carrying to meet the frame of the data of upper-layer service in the frame carrying the data stored, and is sent to described upper-layer service, comprising:
Described BSC calculates according to the number of the frame of the Current GPS time of described BSC and described needs buffering the frame number of frame selected, and selects corresponding frame to be sent to described upper-layer service according to described frame number.
4. method according to claim 3, is characterized in that, described BSC selects corresponding frame to be sent to described upper-layer service according to described frame number, comprising:
Described BSC judges whether have frame corresponding to described frame number in described buffering area;
If so, the frame that the frame that the described frame number had in the more described buffering area of described BSC is corresponding is corresponding with the described frame number received, selects top-quality frame for decoding;
If not, described BSC compares frame corresponding to the described frame number that receives, selects top-quality frame for decoding.
5. the method according to any one of Claims 1-4, it is characterized in that, when the number of the frame carrying the data stored in the buffering area of described BSC reaches described second number, described BSC selects carrying to meet the frame of the data of upper-layer service in the frame carrying the data stored, and be sent to described upper-layer service, comprising:
When before described second number is greater than once the shake of described Abis interface link delay time described buffering area in store the number of the frame of needs buffering time, treat that the number of the frame stored in described buffering area reaches described second number, described BSC selects carrying to meet the frame of the data of upper-layer service in the frame carrying the data stored, and is sent to described upper-layer service; Or
When before described second number is less than once the shake of described Abis interface link delay time described buffering area in store the number of the frame of needs buffering time, described BSC is now engraved in the frame of the data that carrying has stored and selects carrying to meet the frame of the data of upper-layer service, and is sent to described upper-layer service.
6. method according to claim 5, it is characterized in that, when before described second number is less than once the shake of described Abis interface link delay time described buffering area in store the number of the frame of needs buffering time, described BSC is now engraved in the frame of the data that carrying has stored and selects carrying to meet the frame of the data of upper-layer service, and be sent to described upper-layer service, comprising:
When described upper-layer service be data service and when before described second number is less than once the shake of described Abis interface link delay time described buffering area in store the number of the frame of needs buffering time, described BSC is now engraved in the frame of described storage and selects the frame meeting business to be sent to described upper-layer service;
When described upper-layer service be speech business and when before described second number is less than once the shake of described Abis interface link delay time described buffering area in store the number of the frame of needs buffering time, this moment of described BSC only selects the frame of demand fulfillment business to be sent to described upper-layer service according to this result of calculation, discards by the frame selected before this calculating with according to this frame calculating the interframe selected.
7. the method according to any one of Claims 1-4, is characterized in that, the number of the frame stored in the buffering area of described BSC comprises after reaching described second number: the frame arrived after described BSC abandons.
8. method according to claim 5, is characterized in that, the number of the frame stored in the buffering area of described BSC comprises after reaching described second number: the frame arrived after described BSC abandons.
9. a frame choice device, is characterized in that, is integrated in base station controller BSC, comprises:
Determination module, when shaking for Abis interface link delay, determines the maximum delay of described Abis interface link transmission frame, and calculates according to described maximum delay the first number that current needs carry out the frame cushioned;
Adjusting module, for the second number of the frame according to the data that can store in the buffering area of the described BSC of described first number adjustment carrying;
Select module, for when the number of the frame carrying the data stored in the buffering area of described BSC reaches described second number, in the frame carrying the data stored, select carrying to meet the frame of the data of upper-layer service, and be sent to described upper-layer service;
Wherein, described adjusting module comprises:
Increase submodule, for when described first number is double be all greater than before once the shake of described Abis interface link delay time described buffering area in the number of the frame that cushions of the needs that store time, increase described second number;
Reduce submodule, for when described first number is double be all less than before once the shake of described Abis interface link delay time described buffering area in the number of the frame that cushions of the needs that store time, reduce described second number.
10. device according to claim 9, is characterized in that, described determination module comprises:
Receive submodule, in present frame selection course, receive the data that base station transceiver BTS sends at least one frame;
Calculating sub module, for for each frame, receives the current global position system GPS Time Calculation of this frame according to the frame number of this frame and described BSC and goes out the gps time that described BTS sends this frame; And the gps time that more described BSC is current and described BTS send the gps time of this frame, obtain the time delay of Abis interface link corresponding to this frame;
Determine submodule, for the time delay of Abis interface link corresponding at least one frame relatively described, determine described maximum delay.
11. devices according to claim 10, it is characterized in that, described selection module also for calculating the frame number of the frame selected according to the number of the Current GPS time of described BSC and the frame of described needs buffering, selects corresponding frame to be sent to described upper-layer service according to described frame number.
12. devices according to claim 11, is characterized in that, described selection module comprises:
Judging submodule, for judging, whether there is in described buffering area frame corresponding to described frame number;
First chooser module, if for described judge the judged result of submodule as being time, frame corresponding to the described frame number had in more described buffering area and frame corresponding to the described frame number received, select top-quality frame for decoding;
Second chooser module, if when being no for the judged result of described judgement submodule, comparing the frame that the described frame number that receives is corresponding, selects top-quality frame for decoding.
13. devices according to any one of claim 9 to 12, it is characterized in that, described selection module also for when before described second number is greater than once the shake of described Abis interface link delay time described buffering area in store the number of the frame of needs buffering time, treat that the number of the frame stored in described buffering area reaches described second number, in the frame carrying the data stored, select carrying to meet the frame of the data of upper-layer service, and be sent to described upper-layer service; Or, when before described second number is less than once the shake of described Abis interface link delay time described buffering area in store the number of the frame of needs buffering time, now be engraved in the frame of the data that carrying has stored and select carrying to meet the frame of the data of upper-layer service, and be sent to described upper-layer service.
14. devices according to claim 13, it is characterized in that, described selection module also for be data service when described upper-layer service and when before described second number is less than once the shake of described Abis interface link delay time described buffering area in store the number of the frame of needs buffering time, be now engraved in the frame of described storage and select the frame meeting business to be sent to described upper-layer service; When described upper-layer service be speech business and when before described second number is less than once the shake of described Abis interface link delay time described buffering area in store the number of the frame of needs buffering time, this moment only selects the frame of demand fulfillment business to be sent to described upper-layer service according to this result of calculation, discards by the frame selected before this calculating with according to this frame calculating the interframe selected.
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| EP1134915A2 (en) * | 2000-03-15 | 2001-09-19 | Nec Corporation | Mobile communication system with base stations receiving and transmitting data frames |
| CN1346198A (en) * | 2000-09-30 | 2002-04-24 | 华为技术有限公司 | Anti-loss treating method for IP speech sound data package |
| CN101304557A (en) * | 2008-04-25 | 2008-11-12 | 华为技术有限公司 | Packet transmission control method and apparatus |
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| EP1134915A2 (en) * | 2000-03-15 | 2001-09-19 | Nec Corporation | Mobile communication system with base stations receiving and transmitting data frames |
| CN1346198A (en) * | 2000-09-30 | 2002-04-24 | 华为技术有限公司 | Anti-loss treating method for IP speech sound data package |
| CN101304557A (en) * | 2008-04-25 | 2008-11-12 | 华为技术有限公司 | Packet transmission control method and apparatus |
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