CN101047432A - Method for distributing uplink resource - Google Patents
Method for distributing uplink resource Download PDFInfo
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- CN101047432A CN101047432A CN 200610093931 CN200610093931A CN101047432A CN 101047432 A CN101047432 A CN 101047432A CN 200610093931 CN200610093931 CN 200610093931 CN 200610093931 A CN200610093931 A CN 200610093931A CN 101047432 A CN101047432 A CN 101047432A
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Abstract
A method for distributing uplink resource includes calculating collision rate of specific uplink message current frame sent from multiple user device by base station, judging whether calculated out collision rate is in scope of set threshold or not, regulating uplink time slot and sending-backspace window occupied by next frame specific uplink information and sending information of regulated time slot and sending-backspace window to user device through downlink message at next frame as well as sending out specific uplink message by user device in next frame through regulated time slot and sending-backspace if it is not.
Description
Technical field
The present invention relates to the wireless resource allocation method, particularly a kind of method of distributing ascending resource.
Background technology
Currently some have occurred and exempted from licensing system, such as radio area network (WRAN) system.Wherein, the WRAN technology is a kind of emerging network technology, provides high bandwidth to cover on a large scale for remote districts and than low-density population area.WRAN is a kind of network of exempting to permit operation, be that its working band does not need to authorize, it uses cognitive radio technology, seeking the current idle frequency band that not licensed user (LU) takies communicates, for example can be in the licensed band of wireless digital TV-set (DTV), seeking does not have the carrying frequency band of occupied frequency band as WRAN.
WRAN adopts orthogonal frequency division multiplexing multiple access (OFDMA) technology based on time division duplex (TDD) to communicate, and the frame structure that WRAN adopts is: each frame is divided into two subframes, and one of them is a descending sub frame, through following a sub-frame of uplink behind the guard time.US-MAP message, the down channel how the DS-MAP message that descending sub frame comprises leading (preamble), how frame control head (FCH), indicating downlink Radio Resource distribute, indication ascending wireless resource distribute described (DCD) message, up channel is described (UCD) message and descending PHY protocol Data Unit (PDU); Sub-frame of uplink comprises initial message (Initialization), bandwidth resources request message (BW request), urgent coexistent environment notification message (UCS Notification) and the up PHY PDU that is sent by different user devices.Wherein, US-MAP message is used for indicating Initialization, BWrequest, UCS Notification and the up PHY PDU of downlink frame to take which ascending time slot and takies how wide ascending time slot transmission; Initialization is used for the initial synchronisation of subscriber equipment and affiliated base station; BWrequest is used for subscriber equipment to affiliated base station requests uplink bandwidth resource; UCS Notification is used for subscriber equipment when base station report detects LU and LU urgent coexistent situation.In each frame, the guard time that inserts between from the sub-frame of uplink to the descending sub frame is used to guarantee that the base station has adequate time to become reception by transmission.Equally, between the descending sub frame for the sub-frame of uplink of present frame and next frame a guard time is arranged also, this guard time is used to guarantee that the base station can receive the message that all subscriber equipmenies send.
At present, the base station can adopt above-mentioned frame structure structure to send to the message of subscriber equipment, as send US-MAP message, wherein can carry ascending time slot place frequency band that Initialization, BW request that subscriber equipment can send to the base station and UCS Notification take and the width that takies ascending time slot respectively.Usually, the base station is that Initialization, BW request and UCSNotification distribute the ascending time slot of fixed width and give subscriber equipment by the US-MAP message informing, subscriber equipment is determined Initialization, BW request and the shared ascending time slot of UCSNotification according to this US-MAP message, sends these specified upstream message by corresponding ascending time slot to the base station respectively.
Certainly, the frame structure that above frame structure not only adopts for the WRAN system can also be exempted from the frame structure that licensing system adopts for other.
But, the base station is distributed the method for the ascending time slot of fixed width for these upstream messages like this and is existed shortcoming: first, these specified upstream message are based on competition, in the corresponding ascending time slot that is distributed, have a plurality of subscriber equipmenies and send these specified upstream message to affiliated base station simultaneously, be easy to produce conflict, particularly when subscriber equipment resident on the base station was a lot, this can make the base station can't correctly receive the specified upstream message that all subscriber equipmenies send; The second, because the influence of multipath and noise, when transmission quality was poor, the base station can't detect when the shared time slot of these specified upstream message; The 3rd, when the shared time slot of these specified upstream message owing to be subjected to the interference of LU, during poor transmission, the base station can't detect and can't redistribute corresponding time slot.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of method of distributing ascending resource, and it is specified upstream message dynamic assignment ascending resource according to the current licensing system performance of exempting from that this method can make the base station, satisfies the requirement of exempting from the licensing system best performance.
According to above-mentioned purpose, technical scheme of the present invention is achieved in that
A kind of method of distributing ascending resource is characterized in that, this method comprises:
The base station calculates the collision rate of the specified upstream message present frame of a plurality of subscriber equipmenies transmissions, judge that this collision rate is not whether in the preset threshold scope, if, then adjust the shared ascending time slot of next frame specified upstream message or/and send the rollback window, send the shared ascending time slot of adjusted specified upstream message and send the information of rollback window to subscriber equipment at next frame by downstream message, subscriber equipment adopts adjusted ascending time slot and sends on the send opportunity in the rollback window at next frame and sends specified upstream message.
The process of the collision rate of described calculating present frame is:
Base station mistake of statistics respectively receives the specified upstream message counter and the specified upstream message counter of finishing dealing with;
The specified upstream message that receives from subscriber equipment is handled in A, base station in each send opportunity of the shared ascending time slot of the specified upstream message of present frame, finish dealing with one and add 1 for the specified upstream message counter of finishing dealing with, if resolve and can not get correct specified upstream message, change step B over to;
Whether B, base station judgement receive the power of data symbol greater than the threshold value of setting, if then mistake is received the specified upstream message counter and add 1 at this send opportunity;
C, base station calculate specified upstream message collision rate according to the mistake reception specified upstream message counter and the specified upstream message counter of finishing dealing with.
Described base station also statistical correction receives specified upstream message counter and the empty specified upstream message counter that receives, wherein,
In steps A, also comprise: obtain correct specified upstream message if resolve, then will correctly receive the specified upstream message count and add 1;
In step B, also comprise, if not, then sky is received the specified upstream message counter and add 1.
The described threshold value of step B is to set according to background noise of exempting from licensing system and the receiving sensitivity of exempting from licensing system.
The described process that calculates specified upstream message collision rate of step C is:
Specified upstream message collision rate equals mistake and receives the value that the specified upstream message counter obtains divided by the specified upstream message counter of finishing dealing with.
Described base station also is provided with the specified upstream message collision rate that previous frame calculates, and the described process that calculates specified upstream message collision rate of step C is:
The specified upstream message collision rate that specified upstream message collision rate=a * definite value and previous frame calculate+(1-a) * the mistake reception specified upstream message counter/specified upstream of finishing dealing with message counter, wherein, a is between 0～1, exempts from the fixed coefficient that licensing system is determined according to the data smoothing demand of being transmitted.
Described threshold range is according to the load balancing requirements set of exempting from licensing system, is a percentages.
The described shared ascending time slot of adjustment next frame specified upstream message is or/and send the process of rollback window and be:
Judge this collision rate whether greater than the upper limit of threshold range, if the width of then that next frame specified upstream message is shared ascending time slot strengthens or/and send the rollback window and increase;
Judge this collision rate whether less than the lower limit of threshold range, if the width of then that next frame specified upstream message is shared ascending time slot reduces or/and send the rollback window and reduce;
According to the scheduling silence period detect whether exist licensed user to disturb on the shared ascending time slot place frequency band of specified upstream message or the channel disturbance at frequency band place or decline value greater than the value of setting, if then the shared ascending time slot of next frame specified upstream message is adjusted to that not licensed user disturbs or channel disturbance is not more than on the frequency band of value of setting.
The described shared ascending time slot of adjustment next frame specified upstream message is or/and send the process of rollback window and be:
C1, judge this collision rate whether greater than the upper limit of threshold range, if, execution in step C2;
C2, according to the scheduling silence period detect whether exist licensed user to disturb on the shared ascending time slot place frequency band of specified upstream message or the channel disturbance at frequency band place or decline value greater than the value of setting, if then the shared ascending time slot of next frame specified upstream message is adjusted to that not licensed user disturbs or the channel disturbance at frequency band place is not more than on the frequency band of value of setting; If not, the width of then that next frame specified upstream message is shared ascending time slot strengthens or/and send the increase of rollback window.
Described specified upstream message is initial message Initialization, bandwidth resources request message BWrequest or urgent coexistent environment notification message UCS Notification.
From such scheme as can be seen, the collision rate of specified upstream message is calculated in base station of the present invention at present frame, and judge whether the collision rate that is calculated reaches the threshold range that sets in advance, if then adjust the shared ascending time slot of next frame specified upstream message or/and send the rollback window.Therefore, it is specified upstream message dynamic assignment ascending resource according to the current licensing system performance of exempting from that method provided by the invention makes the base station, satisfies the requirement of exempting from the licensing system best performance.
Description of drawings
Fig. 1 is the method flow diagram of specified upstream distribution of messages ascending resource for the present invention.
Embodiment
In order to make the purpose, technical solutions and advantages of the present invention clearer, below lift specific embodiment and, the present invention is described in more detail with reference to accompanying drawing.
Is specified upstream message dynamic assignment ascending resource in order to make the base station according to the current licensing system performance of exempting from, the collision rate of specified upstream message is calculated in the base station of invention at present frame, and judge whether the collision rate that is calculated reaches the threshold range that sets in advance, if then adjust the shared ascending time slot of next frame specified upstream message or/and send the rollback window.
Particularly, whether base station of the present invention detects at present frame and distributes to the ascending time slot that subscriber equipment sends these specified upstream message and satisfy the demand, promptly a plurality of specified upstream message that send respectively by a plurality of subscriber equipmenies of corresponding ascending time slot can not clash, the base station can correct the parsing obtain a plurality of specified upstream message that a plurality of subscriber equipmenies send respectively on corresponding ascending time slot, if, the base station continues to judge whether corresponding ascending time slot has satisfied the needs that send specified upstream message fully, if, then adjust distributing to subscriber equipment and sending the ascending time slot of these specified upstream message and/or send the rollback window at next frame, if not, then do not send the ascending time slot of these specified upstream message and/or send the rollback window and adjust distributing to subscriber equipment at next frame; If not, then the base station at next frame to the ascending time slot of these specified upstream message of distributing to subscriber equipment and sending and/or send the rollback window and adjust.
In the present invention, send opportunity is meant the number of the specified upstream message that the base station can receive in theory at present frame, and its increase according to the ascending time slot width increases; Send indication that the rollback window is meant that the base station sends to institute's administration subscriber equipment and distribute to the information of what send opportunity of subscriber equipment, after subscriber equipment receives this transmission rollback window, therefrom send opportunity of picked at random sends specified upstream message, the transmission rollback window that the base station is provided with is more little, and the sending probability that subscriber equipment sends specified upstream message is also just big more.
Fig. 1 is the method flow diagram of specified upstream distribution of messages ascending resource for the present invention, and its concrete steps are:
In the present invention, the information of the ascending time slot that present frame specified upstream message is shared can send by the US-MAP message in the present frame downstream message, comprises the width of shared ascending time slot and the frequency band at shared ascending time slot place.
The information of send opportunity can send by the UCD message in the present frame downstream message in shared ascending time slot, the information of send opportunity is actually the transmission rollback window control of prior art, this rollback window has two parameters, the rollback window begins parameter and the rollback window finishes parameter, can carry out value from 0～15, just can from the send opportunity sending the rollback window, send specified upstream message by send opportunity of picked at random according to these two parameter value subscriber equipmenies.Send the rollback window if increase, then concerning subscriber equipment, sending probability will reduce; If reduce to send the rollback window, then concerning subscriber equipment, sending probability will increase.
Statistical correction receives the specified upstream message counter respectively, mistake receives specified upstream message counter, the empty specified upstream message counter and the specified upstream message counter of finishing dealing with of receiving for step 101, base station.
If step 102, base station are resolved in the send opportunity of the shared ascending time slot of the specified upstream message of present frame and obtained specified upstream message, then will correctly receive the specified upstream message counter and add 1 respectively with the specified upstream message counter of finishing dealing with; If resolve and can not get specified upstream message, then change step 103 over to.
Whether step 103, base station judgement receive the power of data symbol greater than the threshold value of setting, if then execution in step 104 at this send opportunity; Otherwise, execution in step 105.
The formula (1) that calculating receives the power of data symbol is:
Wherein, k represents the sub-carrier positions of data symbol in the OFDM modulation, and i belongs to the time slot position of data symbol in the OFDM modulation.
The threshold value of setting is to set according to background noise of exempting from the licensing system system and the receiving sensitivity of exempting from licensing system.
After the specified upstream message that step 106, base station are all finished dealing with received in all send opportunity of the shared ascending time slot of the specified upstream message of present frame, receive the specified upstream message counter according to mistake and calculate specified upstream message collision rate with the specified upstream message counter of finishing dealing with, judge that this collision rate is not whether in the preset threshold scope, if, execution in step 107; Otherwise, execution in step 108.
The formula that calculates specified upstream message collision rate is respectively formula (2) and formula (3):
Collision rate (collisionRate)=mistake receives specified upstream message counter (the ReceiveErrorCount)/specified upstream of finishing dealing with message counter (TotalOppCount) (2);
CollisionRate=a* (collisionRate of previous frame)+(1-a) * ReceiveErrorCount/TotalOppCount, (3), wherein a exempts from licensing system to set a fixed coefficient, between 0 to 1, this a is relevant with the demand of data smoothing, the a value is big more, and is smoothly good more, but the data promptness is poor more, otherwise, the a value is more little, and is smoothly poor more, and the data promptness is good more.
If base station stored has the specified upstream message collision rate of previous frame, just can calculate the specified upstream message collision rate of present frame according to formula (3), calculating like this can be more accurate, if the base station does not store the specified upstream message collision rate of previous frame, just can calculate the specified upstream message collision rate of present frame according to formula (2).
In the present invention, in fact specified upstream message collision rate is exactly specified upstream message collision probability.
The present invention sets a threshold range, comprises the upper limit of threshold range and the lower limit of threshold range, and this threshold range is to require to determine according to the load balancing of exempting from licensing system, is a percentages.
The next frame shared ascending time slot of specified upstream message is adjusted or/and send the rollback window in step 107, base station, send adjusted specified upstream message shared ascending time slot and the information that sends rollback window at next frame to subscriber equipment by downstream message, subscriber equipment adopts a send opportunity in adjusted ascending time slot and the transmission rollback window to send specified upstream message at next frame.
The shared ascending time slot of next frame specified upstream message is not adjusted or/and send the rollback window in step 108, base station, send unregulated specified upstream message shared ascending time slot and the information that sends rollback window at next frame to subscriber equipment by downstream message, subscriber equipment adopts a send opportunity in unregulated ascending time slot and the transmission rollback window to send specified upstream message at next frame.
The specified upstream message collision rate of present frame is prescribed a time limit greater than the going up of threshold range that the base station sets, it is narrow or/and to send the rollback window too small to illustrate that present frame is distributed to the width of ascending time slot of specified upstream message, cause specified upstream message that conflict has taken place, the method for solution is: the width of next frame being distributed to the ascending time slot of specified upstream message strengthens or/and send the increase of rollback window.Increasing the process that sends the rollback window is: two parameters resetting the transmission rollback window that includes send opportunity, be about to send that the rollback window begins that ratio present frame that numerical value that parameter is provided with is provided with is provided with is little and send big that ratio present frame that numerical value that the rollback window finishes parameter is provided with is provided with, thereby reduce sending probability.
The specified upstream message collision rate of present frame is prescribed a time limit greater than the going up of threshold range that the base station sets, might illustrate that also present frame distributes to the frequency band at the ascending time slot place of specified upstream message and disturbed by LU, whether at this moment just need to adopt prior art scheduling silence period (QP) induction to detect exists LU to disturb, if, then adjust next frame and distribute to the frequency band at the ascending time slot place of specified upstream message, make the frequency band at its place not have LU to disturb.
Because the specified upstream message collision rate of present frame is prescribed a time limit greater than the going up of threshold range that the base station sets, two kinds of possibilities are arranged and two kinds of settling modes are arranged respectively, so the present invention is before which kind of settling mode decision adopts, can also judge at first that present frame distributes to the frequency band at the ascending time slot place of specified upstream message and whether exist LU to disturb, if then adopt the mode of adjusting frequency band; Otherwise, then adopt the width of adjusting the ascending time slot of distributing to specified upstream message or/and the mode of send opportunity.
The specified upstream message collision rate of present frame is prescribed a time limit greater than the going up of threshold range that the base station sets, also having a kind of possibility is that the specified upstream message of the present frame ascending time slot place subchannel fading ratio of being distributed is more serious, at this moment, need the base station to carry out channel estimating according to prior art, if determine to reach the decline value of setting, then adjust the subchannel at the ascending time slot place that the specified upstream message of present frame distributed, adjust on the not serious subchannel of decline.
The specified upstream message collision rate of present frame is prescribed a time limit less than the following of threshold range that the base station sets, it is excessive or/and to send the rollback window too small to illustrate that present frame is distributed to the width of ascending time slot of specified upstream message, cause the waste of ascending resource, the method for solution is: the narrowed width of ascending time slot of next frame being distributed to specified upstream message is or/and send the rollback window and reduce.Increasing the process that sends the rollback window is: two parameters resetting the rollback window that includes send opportunity, be about to send that the rollback window begins that ratio present frame that numerical value that parameter is provided with is provided with is provided with is big and send little that ratio present frame that numerical value that the rollback window finishes parameter is provided with is provided with, thereby increase sending probability.The narrowed width of next frame being distributed to the ascending time slot of specified upstream message can make ascending resource save, and the increase of sending probability can make subscriber equipment accelerate to send the speed of specified upstream message.
In the present invention, specified upstream message is Initialization, BW request or UCSNotification, and below adopting these several message is example, describes method provided by the invention in WRAN respectively in detail.
The distribution of the UCS ascending time slot that UCS Notification is shared
When subscriber equipment has detected LU,, then in the up channel that is distributed, send UCS Notification to affiliated base station if distributed up channel; If unallocated up channel then sends UCS Notification to affiliated base station on the UCS ascending time slot that is distributed.
When this UCS Notification sends on the UCS ascending time slot that is distributed, only carry a general medium access control (MAC) head, be used for the message of label detection to the shared frequency band of LU, be arranged on after this message can be encrypted in the common MAC head, and do not carry the PDU that comprises the LU jamming report.
The UCSNotification that subscriber equipment may send is detected at each send opportunity of UCS ascending time slot in the base station, on the send opportunity of each UCS ascending time slot, may there be UCSNotification, also might there be UCS Notification, the also situation that might exist a plurality of UCSNotification to clash.Therefore, on each send opportunity of UCS ascending time slot, the process that handle the base station is:
On each send opportunity of UCS ascending time slot, resolve UCS Notification.
In the time can being resolved to UCS Notification, in the counter (ReceiveValidUSCCount) of set correct reception UCSNotification, add 1, in the counter (TotalUSCOppCount) of the set UCS Notification that finishes dealing with, add 1.
When failing to be resolved to UCS Notification, calculate the data symbol power on this send opportunity so, these data symbols are to be modulated on the frequency domain of OFDM (OFDM), and may cross over the data symbol of the USC ascending time slot that is distributed, and are specially:
Wherein, k represents the sub-carrier positions of data symbol in the OFDM modulation, and i belongs to the time slot position of data symbol in the OFDM modulation.
The size of Power that the base station relatively calculates and thresholding P1, this thresholding P1 determines according to the background noise of WRAN system and the receiving sensitivity of WRAN system.
If Power is greater than P1, so possible reason is that conflict has taken place a plurality of UCS Notification that a plurality of different subscriber equipmenies send, but also may be on the frequency band of UCS ascending time slot place the LU interference to have taken place, perhaps on this send opportunity, the deep fading taken place.Whatsoever reason is all handled this situation according to clashing, and promptly adds 1 on the counter (ReceiveErrorUSCCount) of set mistake reception UCS Notification, adds 1 on TotalUSCOppCount;
If Power is not more than P1, reason is to send UCS Notification without any subscriber equipment on this send opportunity so, on the set counter that does not receive UCS Notification (ReceiveNullUSCCount), add 1, on TotalUSCOppCount, add 1.
Like this, the base station just can calculate present frame and receive the receptivity of UCSNotification on the UCS ascending time slot, below concrete this process of narration.
Adopt following formula to calculate the UCS Notification collision rate (USCcollisionRate) of present frame on the UCS ascending time slot:
USCcollisionRate＝ReceiveErrorUSCCount/TotalUSCOppCount
In addition, for the USCcollisionRate that calculates is more accurate, can carry out the USCcollisionRate of the USCcollisionRate of present frame and previous frame relevant.If the size of the width and the UCS rollback window of UCS ascending time slot is not adjusted in the base station when previous frame, the USCcollisionRate of present frame calculates according to following so:
USCcollisionRate=a* (USCcollisionRate of previous frame)+(1-a) * ReceiveErrorUSCCount/TotalUSCOppCount, wherein a is fixed coefficient of WRAN default, between 0 to 1, this a is relevant with the demand of data smoothing, and a value is big more, smoothly good more, but the data promptness is poor more, otherwise a value is more little, smoothly poor more, the data promptness is good more.
If the USCcollisionRate that calculates is greater than the upper limit R1 of preset threshold scope, such as 85%, this R1 sets according to the load balancing ability of WRAN system, so possible reason be in the UCS of present frame ascending time slot for sending send opportunity that UCS Notification distributes very little, cause a plurality of subscriber equipmenies between the UCS Notification that the UCS of present frame ascending time slot sends, to clash respectively.At this moment, the base station just can be adjusted the UCS ascending time slot of next frame, and the process of adjustment is:
The width of next frame UCS ascending time slot is strengthened in the base station, can make more different user devices send more UCS Notification respectively, increases such as the width with next frame UCS ascending time slot to be twice.Because UCS Notification belongs to emergency notice, and do not need the base station to reply, so the width of UCS ascending time slot can not by the base station adjust excessive, therefore, the base station is when strengthening UCS ascending time slot width or not strengthening UCS ascending time slot width, can also strengthen the UCS that receives UCD Notification and send the rollback window, the UCS Notification rollback that the transmission rollback window that receives UCD Notification promptly is set respectively begins (UCS Notification Backoff Start) and UCSNotification rollback end (UCS Notification Backoff End) these two parameters, the change of these two parameters means that also having reduced the probability of each subscriber equipment when the selection of present frame UCS send opportunity sends reduces, and just selects wider send opportunity to carry out UCS Notification and sends.Therefore, the present invention has been alleviated the situation that a plurality of inadequately subscriber equipmenies of next frame UCS ascending time slot use by the width of increasing UCS ascending time slot and the size of UCS transmission rollback window.
If the USCcollisionRate that calculates is less than the lower limit R2 of threshold range, such as 30%, the WRAN system has satisfied the transmission needs of current UCS Notification, can consider to reduce UCS ascending time slot taking this moment to whole WRAN system resource, in addition, also to consider UCSNotification is sent to as early as possible the demand of base station, so this moment, consideration reduced the width of UCS ascending time slot, or/and by adjusting the speed that UCS sends the size quickening user equipment to report UCSNotification of rollback window.
By previous frame or after upward the width of the UCS ascending time slot of several frames strengthens and send the increasing of rollback window, the USCcollisionRate of the UCS ascending time slot of present frame is still greater than the R1 that sets, so possible reason is that the UCS ascending time slot channel status of present frame is poor, also may occur the interference of LU to current WRAN system in addition.Therefore, the present invention needs to solve, and the way of solution as described below.
According to normal flow scheduling QP, detect the interference that whether has LU on the current communications band, if can adjust the frequency band at UCS ascending time slot place.For example, the frequency band that disturbed by LU is 1MHz, and present frame UCS ascending time slot is positioned at first 1MHz frequency band, then the UCS ascending time slot is adjusted in the part bandwidth of the 3rd 1MHz.
When above-mentioned adjustment, can consider three ascending time slot place frequency bands that send Initialization, UCS Notification and BWRequest are changed together, also can change the frequency band at the ascending time slot place that sends UCSNotification separately.
The distribution of the ascending time slot that BW request is shared
When subscriber equipment need send upstream data and not have enough upstream channel bandwidths again, subscriber equipment will send BW request.Subscriber equipment has two methods that send BW request, and the firstth, in the up channel that present frame distributes, send; The secondth, when subscriber equipment did not distribute the allocated bandwidth of up channel or up channel to be not enough to send BW request at present frame, subscriber equipment just need send BW request on BW request ascending time slot.
When this BW request sends at the ascending time slot that is distributed, only carry a versatile MAC head and the sub-head of bandwidth request according to prior art, the base station is after receiving this BW request, can send the bandwidth grant message to subscriber equipment by downstream message, the BW request that receives is confirmed.
The distribution of the ascending time slot of BW request is similar to the distribution of UCS ascending time slot substantially, and is still according to the purposes of BW request, slightly different.
The BW request that subscriber equipment may send is detected at each send opportunity of ascending time slot in the base station, on the send opportunity of each ascending time slot, may there be BW request, also might do not have BWrequest, the situation that also might exist a plurality of BW request to clash.Therefore, on each send opportunity of ascending time slot, the process that handle the base station is:
On each send opportunity of ascending time slot, resolve BW request.
In the time can being resolved to BW request, in the counter (ReceiveValidBWCount) of set correct reception BW request, add 1, in the counter (TotalBWOppCount) of the set BW request that finishes dealing with, add 1.
When failing to be resolved to BW request, calculate the data symbol power on this send opportunity so, these data symbols are to be modulated on the frequency domain of OFDM (OFDM), and may cross over the data symbol of the ascending time slot that is distributed, and are specially:
The size of Power that the base station relatively calculates and thresholding P1, this thresholding P1 determines according to the background noise and the WRAN system receiving sensitivity of WRAN system.
If Power is greater than P1, so possible reason is that conflict has taken place a plurality of BW request that a plurality of different subscriber equipmenies send, but also may be on the frequency band of ascending time slot place the LU interference to have taken place, and perhaps on this send opportunity the deep fading has been taken place.Whatsoever reason is all handled this situation according to clashing, and promptly adds 1 on the counter (ReceiveErrorBWCount) of set mistake reception BW request, adds 1 on TotalBWOppCount;
If Power is not more than P1, reason is to send BW request without any subscriber equipment on this send opportunity so, on the set counter that does not receive BW request (ReceiveNullBWCount), add 1, on TotalBWOppCount, add 1.
Like this, the base station just can calculate present frame and receive the receptivity of BW request on ascending time slot, below concrete this process of narration.
Adopt following formula to calculate the BW request collision rate (BWcollisionRate) of present frame on ascending time slot:
BWcollisionRate＝ReceiveErrorBWCount/TotalBWOppCount
In addition, for the BWcollisionRate that calculates is more accurate, can carry out the BWcollisionRate of the BWcollisionRate of present frame and previous frame relevant.If the size of the width and the rollback window of ascending time slot is not adjusted in the base station when previous frame, the BWcollisionRate of present frame calculates according to following so:
BWcollisionRate=a* (BWcollisionRate of previous frame)+(1-a) * ReceiveErrorBWCount/TotalBWOppCount, wherein a is fixed coefficient of WRAN default, between 0 to 1, this a is relevant with the demand of data smoothing, and a value is big more, smoothly good more, but the data promptness is poor more, otherwise a value is more little, smoothly poor more, the data promptness is good more.
If the BWcollisionRate that calculates is greater than the upper limit R1 of preset threshold scope, such as 85%, this R1 requires to set according to the access control of WRAN system, so possible reason be in the ascending time slot of present frame for sending send opportunity that BW request distributes very little, cause a plurality of subscriber equipmenies between the BW request that the ascending time slot of present frame sends, to clash respectively.At this moment, the base station just can be adjusted the ascending time slot of next frame, and the process of adjustment is:
The purpose of considering BW request is in order to apply for the bandwidth of up channel, so need treat with a certain discrimination according to the ascending resource of current WRAN.
If under the situation that is distributed in the service needed that satisfies existing subscriber equipment of the ascending resource of current WRAN, also has more surplus, ascending resource such as current WRAN also has 30% not distribute, WRAN can be more user equipment allocation bandwidth so, the width of next frame time slot is strengthened in the base station so, can hold more BW request message.In addition, also can strengthen the transmission rollback window that receives BWrequest, the BW request rollback that the transmission rollback window that receives BW request promptly is set respectively begins (Backoff Start) and these two parameters of BW request rollback end (Backoff) End, the change of these two parameters means that also having reduced the probability of each subscriber equipment when the selection of present frame send opportunity sends reduces, and just selects wider send opportunity to carry out BW request and sends.Therefore, the present invention has been alleviated the situation that a plurality of inadequately subscriber equipmenies transmission of next frame ascending time slot BW request uses by width that strengthens ascending time slot and the size that sends the rollback window.
If under the situation that is distributed in the service needed that satisfies existing subscriber equipment of the ascending resource of current WRAN, be left few, such as the ascending resource that only has 10%, the base station can not be more user equipment allocation bandwidth so, this moment, the shared ascending time slot of BW request can not be adjusted in the base station, even because the BW request message that receives can not be these user equipment allocation upstream channel bandwidths more.So can strengthen the A Se rollback window that receives BW request this moment.
If BWCcollisionRate is less than the lower limit R2 of threshold range, such as 30%, the WRAN system has satisfied the needs of current BW request, the purpose of considering BW request is in order to apply for the bandwidth of up channel, so need treat with a certain discrimination according to the ascending resource of current WRAN.If the ascending resource surplus of current WRAN is few, such as being less than 10%, can consider to reduce the shared ascending time slot of BW request this moment to the taking of whole WRAN, promptly adjust the width of the shared ascending time slot of BWrequest.
If the ascending resource surplus of current WRAN is many, such as greater than 30%, the shared ascending time slot of BWrequest this moment does not need to adjust, and sends the rollback window size but change, to accelerate the speed that subscriber equipment sends BW request.
By previous frame or after upward the width of the ascending time slot of several frames strengthens and send the increasing of rollback window, the BW request of the ascending time slot of present frame is still greater than the R1 that sets, so possible reason is that the ascending time slot channel status of present frame is poor, also may occur the interference of LU to current WRAN system in addition.Therefore, the present invention needs to solve, and the way of solution as described below.
According to normal flow scheduling QP, detect the interference that whether has LU on the current communications band.If can adjust the frequency band at ascending time slot place.For example, the frequency band that disturbed by LU is 1MHz, and the present frame ascending time slot is positioned at first 1MHz frequency band, then ascending time slot is adjusted in the part bandwidth of the 3rd 1MHz.
The distribution of the ascending time slot that Initialization is shared
The Initialization purpose be at subscriber equipment when entering WRAN, can adjust its transmitted power rapidly to suitable scope, simultaneously carry out time synchronized with the WRAN network side, its assigning process with the shared ascending time slot of UCSNotification is similar substantially, just no longer repeats here.
Except adjusting the pairing ascending time slot according to above-mentioned special upstream message state in use, can also be in conjunction with other condition as the foundation of adjusting pairing ascending time slot position and size.Such as, according to the channel estimating of WRAN system, find that pairing ascending time slot is being positioned on the frequency domain on the more serious subchannel of frequency selective fading.Need so pairing ascending time slot is adjusted on the good subchannel of channel status.
The above only is preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of being made within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1, a kind of method of distributing ascending resource is characterized in that, this method comprises:
The base station calculates the collision rate of the specified upstream message present frame of a plurality of subscriber equipmenies transmissions, judge that this collision rate is not whether in the preset threshold scope, if, then adjust the shared ascending time slot of next frame specified upstream message or/and send the rollback window, send the shared ascending time slot of adjusted specified upstream message and send the information of rollback window to subscriber equipment at next frame by downstream message, subscriber equipment adopts adjusted ascending time slot and sends on the send opportunity in the rollback window at next frame and sends specified upstream message.
2, the method for claim 1 is characterized in that, the process of the collision rate of described calculating present frame is:
Base station mistake of statistics respectively receives the specified upstream message counter and the specified upstream message counter of finishing dealing with;
The specified upstream message that receives from subscriber equipment is handled in A, base station in each send opportunity of the shared ascending time slot of the specified upstream message of present frame, finish dealing with one and add 1 for the specified upstream message counter of finishing dealing with, if resolve and can not get correct specified upstream message, change step B over to;
Whether B, base station judgement receive the power of data symbol greater than the threshold value of setting, if then mistake is received the specified upstream message counter and add 1 at this send opportunity;
C, base station calculate specified upstream message collision rate according to the mistake reception specified upstream message counter and the specified upstream message counter of finishing dealing with.
3, method as claimed in claim 2 is characterized in that, described base station also statistical correction receives specified upstream message counter and the empty specified upstream message counter that receives, wherein,
In steps A, also comprise: obtain correct specified upstream message if resolve, then will correctly receive the specified upstream message count and add 1;
In step B, also comprise, if not, then sky is received the specified upstream message counter and add 1.
4, method as claimed in claim 2 is characterized in that, the described threshold value of step B is to set according to background noise of exempting from licensing system and the receiving sensitivity of exempting from licensing system.
5, method as claimed in claim 2 is characterized in that, the described process that calculates specified upstream message collision rate of step C is:
Specified upstream message collision rate equals mistake and receives the value that the specified upstream message counter obtains divided by the specified upstream message counter of finishing dealing with.
6, method as claimed in claim 2 is characterized in that, described base station also is provided with the specified upstream message collision rate that previous frame calculates, and the described process that calculates specified upstream message collision rate of step C is:
The specified upstream message collision rate that specified upstream message collision rate=a * definite value and previous frame calculate+(1-a) * the mistake reception specified upstream message counter/specified upstream of finishing dealing with message counter, wherein, a is between 0～1, exempts from the fixed coefficient that licensing system is determined according to the data smoothing demand of being transmitted.
7, the method for claim 1 is characterized in that, described threshold range is according to the load balancing requirements set of exempting from licensing system, is a percentages.
8, the method for claim 1 is characterized in that, the described shared ascending time slot of adjustment next frame specified upstream message is or/and send the process of rollback window and be:
Judge this collision rate whether greater than the upper limit of threshold range, if the width of then that next frame specified upstream message is shared ascending time slot strengthens or/and send the rollback window and increase;
Judge this collision rate whether less than the lower limit of threshold range, if the width of then that next frame specified upstream message is shared ascending time slot reduces or/and send the rollback window and reduce;
According to the scheduling silence period detect whether exist licensed user to disturb on the shared ascending time slot place frequency band of specified upstream message or the channel disturbance at frequency band place or decline value greater than the value of setting, if then the shared ascending time slot of next frame specified upstream message is adjusted to that not licensed user disturbs or channel disturbance is not more than on the frequency band of value of setting.
9, the method for claim 1 is characterized in that, the described shared ascending time slot of adjustment next frame specified upstream message is or/and send the process of rollback window and be:
C1, judge this collision rate whether greater than the upper limit of threshold range, if, execution in step C2;
C2, according to the scheduling silence period detect whether exist licensed user to disturb on the shared ascending time slot place frequency band of specified upstream message or the channel disturbance at frequency band place or decline value greater than the value of setting, if then the shared ascending time slot of next frame specified upstream message is adjusted to that not licensed user disturbs or the channel disturbance at frequency band place is not more than on the frequency band of value of setting; If not, the width of then that next frame specified upstream message is shared ascending time slot strengthens or/and send the increase of rollback window.
10, the method for claim 1 is characterized in that, described specified upstream message is initial message Initialization, bandwidth resources request message BW request or urgent coexistent environment notification message UCS Notification.
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