CN116419410A - Self-adaptive adjustment method for scheduling request period - Google Patents
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Abstract
The application provides a scheduling request period self-adaptive adjustment method, which comprises the following steps: the base station calculates the scheduling request information received by the cell according to a statistical decision period P; the base station counts the online user number of the cell; the base station judges the adjustment strategy of the scheduling request period according to the cell scheduling request information and the statistical information of the online user number; and the base station executes the adjustment action of the scheduling request period according to the adjustment strategy of the scheduling request period. According to the method and the device, the SR information and the online user number received by the base station are subjected to self-adaptive adjustment on the adjustment request period, so that the base station can give consideration to uplink delay and air interface uplink channel resource overhead in various application scenes and busy hours, the uplink delay under light load of the network is reduced, and the SR-MAX call drop rate under heavy load of the network is reduced.
Description
Technical Field
The present invention relates to wireless communication technologies, and in particular, to a scheduling request period adaptive adjustment method.
Background
The load of UCI (Uplink Control Information, UCI) conveyed on the 5G NR PUCCH channel includes three types of information, scheduling request (Scheduling Request, SR), HARQ-ACK, and channel state information (Channel State Information, CSI), respectively. The scheduling request is used for requesting uplink resources from the base station gNB so as to transmit the PUSCH, and invalid uplink data scheduling and uplink air interface resource waste of the gNB can be avoided through active application of the user terminal UE.
The sending time of the scheduling request and the used PUCCH resource can be configured statically only through RRC layer signaling, and the UE is notified by the IEScheduling-RequestResourceConfig. The scheduling request period (in slots or symbols) and the slot OFFSET are configured by the higher layer parameters Periodicity And Offset. The smaller the scheduling request period configuration is, the smaller the uplink delay is, but more air interface uplink channel resources are occupied; the larger the allocation of the scheduling request period is, the less the occupied air interface uplink channel resources are, and more UEs can be accommodated to send scheduling requests, but the uplink delay is increased.
The 5G NR defines eMBB, URRLC, mMTC multi-scene application, the load difference of the users of cells in wireless networks of different scenes is larger, and the user tide phenomenon of the same base station also exists in the early and late peak period, so that the network side is difficult to adopt a unified scheduling request period configuration value to simultaneously meet the uplink transmission demands of the base stations of different scenes and different periods.
Disclosure of Invention
The invention aims to provide a self-adaptive adjustment method for a scheduling request period, which is used for carrying out statistics on scheduling request information received by a 5GNR base station (gNB) cell, and self-adaptively adjusting a scheduling request period configuration value by combining the number of users, so that the base station can take uplink delay and air interface uplink channel resource overhead into consideration in various application scenes and busy hours, and the uplink delay under light load of a network and the heavy load downlink scheduling request-MAX call drop rate are reduced.
The following presents a simplified summary of one or more aspects in order to provide a basic understanding of such aspects. This summary is not an extensive overview of all contemplated aspects, and is intended to neither identify key or critical elements of all aspects nor delineate the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form as a prelude to the more detailed description that is presented later.
According to an aspect of the present invention, there is provided a scheduling request period adaptive adjustment method, including:
the base station calculates the scheduling request information received by the cell according to a statistical decision period P;
the base station counts the online user number of the cell;
the base station judges the adjustment strategy of the scheduling request period according to the cell scheduling request information and the statistical information of the online user number;
and the base station executes the adjustment action of the scheduling request period according to the adjustment strategy of the scheduling request period.
In an embodiment, the management granularity of the statistical decision period P is an integer multiple of a time slot, a subframe or a frame, and the statistical decision period P is preconfigured or is open to modification of the configuration of the client interface.
In an embodiment, the base station performs statistics on the scheduling request information received by the cell according to a statistics decision period P, specifically: the base station respectively calculates the times of the scheduling request received by the cell, the times of the scheduling request exceeding half of the maximum transmission times configured by the protocol and the times of the scheduling request exceeding the maximum transmission times configured by the protocol according to the statistical decision period P.
In an embodiment, the online user number includes an RRC connection user number and an activation user number.
In an embodiment, the adjustment policy of the scheduling request period includes shortening, lengthening or maintaining the scheduling request period.
In one embodiment, only 1 level is adjusted at a time to shorten or lengthen the scheduling request period.
In an embodiment, the base station determines an adjustment policy of a scheduling request period according to cell scheduling request information and statistics information of an online user number, including: when the proportion of the scheduling request exceeding half of the maximum transmission times of the protocol configuration is higher than a first threshold value, the scheduling request period is prolonged; and when the proportion of the scheduling request exceeding half of the maximum transmission times of the protocol configuration is lower than a second threshold value, shortening the scheduling request period.
In an embodiment, the base station determines an adjustment policy of a scheduling request period according to cell scheduling request information and statistics information of an online user number, including: and when the proportion of the scheduling request exceeding the maximum transmission times of the protocol configuration exceeds a third threshold value and the number of RRC connection users and the number of activation users exceed a fourth threshold value at the same time, directly adjusting the SR cycle to the maximum value of the protocol configuration.
In an embodiment, the performing scheduling request cycle adjustment action is only effective for new access users.
In an embodiment, the performing the scheduling request period adjustment action is performed for all users, and when the scheduling request period adjustment action is performed, the scheduling request periods of the online users are reconfigured according to periods, and the maximum reconfiguration user number in each period does not exceed the maximum reconfiguration threshold.
The embodiment of the invention has the beneficial effects that: the SR information and the online user number received by the base station are subjected to self-adaptive adjustment on the adjustment request period, so that the base station can give consideration to uplink delay and air interface uplink channel resource overhead in various application scenes and busy hours, the uplink delay under the light load of the network is reduced, and the SR-MAX call drop rate under the heavy load of the network is reduced.
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In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
The above features and advantages of the present invention will be better understood after reading the detailed description of embodiments of the present disclosure in conjunction with the following drawings. In the drawings, the components are not necessarily to scale and components having similar related features or characteristics may have the same or similar reference numerals.
FIG. 1 is a 5G NR air interface uplink SR schedule flow chart;
FIG. 2 is a schematic diagram of a 5G NR air interface SR-MAX call drop;
FIG. 3 is a SR cycle adjustment flow chart provided by an embodiment of the present application;
FIG. 4 is a SR cycle adaptive adjustment decision flow provided by an embodiment of the present application;
fig. 5 is an online user reconfiguration procedure provided in an embodiment of the present application.
Detailed Description
The invention is described in detail below with reference to the drawings and the specific embodiments. It is noted that the aspects described below in connection with the drawings and the specific embodiments are merely exemplary and should not be construed as limiting the scope of the invention in any way.
In order to better understand the technical background principle of the method provided by the embodiment of the application, a description is first made with respect to a 5GNR air interface uplink SR scheduling procedure. Fig. 1 is a 5G NR air interface uplink SR scheduling flow, as shown in fig. 1, including the following steps:
101, ue (user terminal) random access.
102, the gnb (base station) sends SR cycle resources and parameter configuration to the UE through rrc_reconfig message, including SR cycle period (in units of slots or symbols) and slot OFFSET, and SR-fransmax (protocol configuration maximum number of transmissions).
103, the ue determines whether there is uplink data to send to the network.
104, if there is uplink data to be sent to the network, the UE determines whether the SR period is up, and if not, continues waiting.
105, if the SR period expires, the SR is transmitted to the gNB through the PUCCH channel.
106, while the UE maintains the sr_counter COUNTER incremented by 1.
107, when the gNB receives the SR sent by the UE, uplink scheduling is performed to allocate PUSCH resources to the UE, and the scheduling UL Grant is sent to the UE through a PDCCH DCI 0_1.
108, when receiving the PDCCH DCI 0_1, the UE clears an SR_COUNTER COUNTER maintained by the UE.
109, the ue simultaneously sends uplink data through the PUSCH channel according to the UL Grant information carried by the received DCI 0_1.
In step 107, if the network reloads multiple users, the UE may not obtain uplink scheduling on the network side in time, i.e. the UE does not receive UL Grant, and then goes to 104 to determine that the next SR period arrives and the SR-inhibit timer time interval has been reached, and then the SR is retransmitted 105, and meanwhile, the 106sr_counter counter is incremented by 1.
If sr_counter > =sr-TransMax, the UE still does not receive UL Grant (gets network side scheduling), then the RRC is notified to release channel resources of all serving cells, and 101PRACH random access is triggered in the primary cell, which is the procedure SR-MAX dropped call. Taking SR-TransMax configuration as 8 as an example, a 5G NR air interface SR-MAX call drop schematic diagram is shown in FIG. 2.
On the basis of the background technology, the embodiment of the application provides a scheduling request period self-adaptive adjustment method, which comprises the following steps:
A. the base station calculates the scheduling request information received by the cell according to a statistical decision period P;
B. the base station counts the online user number of the cell; the statistical maintenance of the number of online users is continuous and real-time, such as adding 1 when the user accesses and subtracting 1 when the user releases. And when the SR period is adjusted and judged, the current latest user number is seen.
C. The base station judges the adjustment strategy of the scheduling request period according to the cell scheduling request information and the statistical information of the online user number;
D. and the base station executes the adjustment action of the scheduling request period according to the adjustment strategy of the scheduling request period.
The improved SR scheduling flow is shown in fig. 3. Compared with the uplink SR scheduling flow of the 5g NR air interface of fig. 1, the scheduling flow mainly includes 302 user number statistics, 308/313 network side sr_counter COUNTER maintenance, 309SR information statistics, 310SR period decision, and 311SR period adaptive adjustment decision steps.
Wherein:
302, the base station performs maintenance statistics on the number of cell RRC connection users and the number of data users.
308, when the network side receives the SR sent by the UE, the sr_counter COUNTER maintained by the network side is incremented by 1.
309, the base station receives SR times sr_receive_counter, sr_counter > =sr-fransmax/2 times for the cell, and
the number of times that SR_COUNTER > =sr-TransMax is counted, the statistics is carried out each time the SR is received, and the proportion Ratio of the SR_COUNTER to the sr_receiver_counter half of the SR times that the SR_COUNTER receives in the cell and the proportion Ratio of the SR_COUNTER to the sr_TransMax to the SR times that the SR_receiver_counter receives in the cell are calculated.
Ratio_SrMaxHalf＝(SR_COUNTER>＝sr-TransMax/2)/SR_Receive_Counter；
Ratio_SrMax＝(SR_COUNTER>＝sr-TransMax)/SR_Receive_Counter。
According to the network design experience of the base station system, when the SR_COUNTER reaches one half of SR-TransMax, the scheduling priority of the SR scheduling request needs to be considered to be improved, and the SR-MAX call drop risk is reduced. Considering that the SR period self-adaptive adjustment method is matched with the SR scheduling priority adjustment method, the method counts the proportion of SR_COUNTER reaching the SR-TransMax half.
310, judging whether an SR statistical judgment period is up, if so, carrying out 311SR period self-adaptive adjustment judgment; otherwise, continuing to wait for the end of the decision period, and jumping to 312 to execute step.
311, the SR period adjustment is divided into three strategies, namely SR period shortening/lengthening/maintaining, and the specific decision flow is shown in fig. 4 and method example four.
313, after the network side schedules and sends UL Grant, the sr_counter COUNTER maintained by the network side is cleared.
In order to avoid the ping-pong fluctuation of the SR cycle adjustment, a high hysteresis threshold and a low hysteresis threshold can be designed for maintaining the state, namely, when the proportion of the scheduling request exceeding half of the maximum transmission times of the protocol configuration is higher than a first threshold, the scheduling request cycle is prolonged; and when the proportion of the scheduling request exceeding the half of the protocol configuration maximum transmission times is lower than the second threshold value, shortening the scheduling request period, so that the proportion of the scheduling request exceeding the half of the protocol configuration maximum transmission times is kept between the first threshold value and the second threshold value.
Further, only 1 level is adjusted each time the scheduling request period is shortened or lengthened, so that the SR period gradually converges to the current network reasonable value self-adaptive adjustment.
Taking the FR1 scs=30 kHz protocol definition as an example:
the SR configurable period includes: 1sl,2sl,4sl,8sl,10sl,16sl,20sl,40sl,80sl,160sl, wherein "sl" represents the slot. The protocol defines that the configuration period is arranged from small to large, and the method assumes that the adjacent period is configured to be 1 level. For example, if the current SR period configuration value is 10sl, and if the current statistical decision period is determined to be 406, one level needs to be elongated, the SR period configuration of the next statistical period is adjusted to be the next level of 10sl, namely 16sl; if the current statistics decision period is 408, the SR period of the next statistics period is adjusted to be 10sl, i.e. 8sl, before the previous level.
In a possible embodiment, considering that the SR-MAX call drop belongs to a serious call drop problem of the heavy-duty network, when the SR-MAX call drop condition is judged to be met, the SR period needs to be directly adjusted to the maximum value of the protocol definition configuration so as to eliminate the call failure as soon as possible.
Specifically, when the ratio of the number of RRC connection users and the number of activated users exceeds the third threshold and the ratio of the number of transmission times exceeds the fourth threshold (the judgment is increased to exclude SR-MAX abnormal scenarios caused by individual poor air interface quality UEs, but not heavy-duty multi-user data SR scheduling untimely scenarios), the SR period is directly adjusted to the maximum value of the protocol configuration.
In this embodiment, the specific judgment process is shown in fig. 4.
401, judging whether the SR statistical time length reaches the statistical decision period, if so, carrying out 402 statistical cycle decision processing, otherwise, continuing to carry out statistics.
And (2) judging whether the Ratio ratio_SrMax of the SR_COUNTER reaching the SR-TransMax exceeds a third Threshold threshold_SrMax or not, continuing to judge the user number condition by continuing to perform 403 if the condition is met, otherwise, jumping to 405 to judge that the Ratio of the SR_COUNTER reaching half of the SR-TransMax is reached.
403, it is determined whether the RRC connected user number and the activated user number simultaneously exceed a fourth Threshold (threshold_rc_ue and threshold_active_ue, respectively) and must be satisfied simultaneously. This determination is added to exclude SR-MAX anomaly scenarios caused by individual poor air quality UEs, rather than heavy-duty multi-user SR scheduling untimely scenarios. The meeting condition makes 404 the SR period to be directly adjusted to the protocol configuration maximum value, otherwise the jump to 409 the SR period remains unchanged. The SR-MAX call drop belongs to the serious call drop problem of the heavy-duty network, so when the judgment branch is designed to meet the condition, the SR period needs to be directly adjusted to the maximum value of the protocol definition configuration, and the call failure is eliminated as soon as possible.
404, the SR period is directly adjusted to a protocol configurable maximum, the protocol definition being related to the cell subcarrier spacing, for example for FR1 SCS = 30kHz, the SR configurable period: 1sl,2sl,4sl,8sl,10sl,16sl,20sl,40sl,80sl,160sl, then the protocol definition configuration maximum is 160sl.
405, it is determined whether the Ratio of sr_counter to half SR-TransMax is higher than a first threshold threshholdhigh_srmaxhaf (e.g. preset to 60%, interface configurable). The condition is met for 406 the adjustment process, otherwise the jump to 407 continues the decision.
406, if the condition is met, the SR cycle is extended by one level according to the protocol SR cycle configuration list based on the current cycle configuration value.
407, it is determined whether the Ratio of sr_counter to half SR-TransMax is lower than a second threshold threshholdlow_srmaxhaf (e.g. preset to 40%, interface configurable). The condition is satisfied for 408 adjustment processing, otherwise the process jumps to 409 processing.
408, if the condition is met, the SR cycle is shortened by one level according to the protocol SR cycle configuration list based on the current cycle configuration value.
409, the sr period remains, i.e. is not adjusted.
410, after the SR statistics period decision is completed, the SR correlation statistics value is cleared.
411, the process ends.
In step D, there may be two schemes for performing the scheduling request cycle adjustment action, and the scheme selection policy may be configured by the client interface.
Scheme one: only for new access users. The first scheme is simple in processing and can be executed when the new access user issues the SR configuration at 303;
scheme II: adjustment is made for all users, including accessed online users. In the second scheme, when the number of online users is considered, the RRC reconfiguration is performed to adjust the SR period of all online users, so that the air interface RRC reconfiguration message can be greatly increased in a short time, the air interface message is most likely to be congested, and the SR period is also likely to be adaptively prolonged and the state ping-pong is also likely to be shortened. Therefore, the second scheme is designed to reconfigure the on-line user SR according to the period (the period is the same as the statistics decision period P), and limit the maximum reconfiguration user number threshold in the period, for example, 10 (which can be optimized according to the actual test condition).
An online user adjustment execution process may be added after 313, see fig. 5 for a specific process flow, including:
501, processing is performed on the online user according to 311SR cycle statistics.
The decision policy is maintained 502 and the process is skipped 509 without the need for adjustment, otherwise 503 is performed.
503, initializing zero by the reconfiguration user number of the cell SR period.
504, cell online users are polled.
505, deciding if the cell has any online user not re-configured with SR period, if so, performing 506 decision processing, otherwise jumping to 509.
506, determining whether the number of reconfiguration users after the SR period is completed is less than a maximum reconfiguration user number threshold. And (5) carrying out 507 reconfiguration user SR cycle processing when the condition is met, otherwise, jumping to 509 to finish processing, and waiting for the next cycle to continue reconfiguration adjustment.
507, the gNB issues an RRC reconfiguration message to the UE to reconfigure the user SR cycle.
508, the sr period reassorts the number of users plus 1.
509, the process ends.
In summary, the embodiment of the present application provides a method for adaptively adjusting a scheduling request period, which adaptively adjusts an SR configuration period according to SR information and an online user condition received by a base station, so that the base station can take uplink delay and overhead of an air uplink channel resource into consideration in various application scenarios and busy hours, and can reduce uplink delay under a light load of a network and reduce SR-MAX dropped call rate under a heavy load of the network.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other.
The previous description of the disclosure is provided to enable any person skilled in the art to make or use the disclosure. Various modifications to the disclosure will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other variations without departing from the spirit or scope of the disclosure. Thus, the disclosure is not intended to be limited to the examples and designs described herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
The foregoing description is of the preferred embodiment of the present application and is not intended to limit the invention to the particular form disclosed, but on the contrary, the intention is to cover all modifications, equivalents, alternatives, and alternatives falling within the spirit and scope of the invention.
Claims (10)
1. A method for adaptively adjusting a scheduling request period, comprising:
the base station calculates the scheduling request information received by the cell according to a statistical decision period P;
the base station counts the online user number of the cell;
the base station judges the adjustment strategy of the scheduling request period according to the cell scheduling request information and the statistical information of the online user number;
and the base station executes the adjustment action of the scheduling request period according to the adjustment strategy of the scheduling request period.
2. The adaptive adjustment method for scheduling request periods according to claim 1, characterized in that: the management granularity of the statistical decision period P is an integer multiple of a time slot, a subframe or a frame, and the statistical decision period P is preconfigured or opened for configuration modification of a client interface.
3. The adaptive adjustment method of scheduling request period according to claim 1, wherein the base station performs statistics on the scheduling request information received by the cell according to a statistics decision period P, specifically: the base station respectively calculates the times of the scheduling request received by the cell, the times of the scheduling request exceeding half of the maximum transmission times configured by the protocol and the times of the scheduling request exceeding the maximum transmission times configured by the protocol according to the statistical decision period P.
4. The adaptive adjustment method of scheduling request period according to claim 1, wherein the number of online users includes a number of RRC connected users and a number of activated users.
5. The method of claim 1, wherein the scheduling request period adjustment policy includes shortening, lengthening, or maintaining the scheduling request period.
6. The adaptive adjustment method of scheduling request period according to claim 5, wherein the adjustment is performed by only 1 level each time the scheduling request period is shortened or lengthened.
7. The adaptive adjustment method of scheduling request period according to claim 1, wherein the base station decides an adjustment strategy of scheduling request period according to cell scheduling request information and statistics information of online user number, comprising:
when the proportion of the scheduling request exceeding half of the maximum transmission times of the protocol configuration is higher than a first threshold value, the scheduling request period is prolonged;
and when the proportion of the scheduling request exceeding half of the maximum transmission times of the protocol configuration is lower than a second threshold value, shortening the scheduling request period.
8. The adaptive adjustment method of scheduling request period according to claim 7, wherein the base station decides the adjustment strategy of scheduling request period according to the cell scheduling request information and the statistics of the online user number, and comprises:
and when the proportion of the scheduling request exceeding the maximum transmission times of the protocol configuration exceeds a third threshold value and the number of RRC connection users and the number of activation users exceed a fourth threshold value at the same time, directly adjusting the SR cycle to the maximum value of the protocol configuration.
9. The method of claim 1, wherein the performing scheduling request period adjustment actions is effected only for new access users.
10. The adaptive adjustment method of scheduling request period according to claim 1, wherein the performing the adjustment of scheduling request period is performed for all users, and the scheduling request period of the online user is reconfigured according to the period, and the maximum reconfiguration user number in each period does not exceed a maximum reconfiguration threshold.
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