CN100490355C

CN100490355C - Adaptive bandwidth regulating method for block data business

Info

Publication number: CN100490355C
Application number: CNB2005100643562A
Authority: CN
Inventors: 黄凯涛
Original assignee: Huawei Technologies Co Ltd
Current assignee: XFusion Digital Technologies Co Ltd
Priority date: 2005-04-14
Filing date: 2005-04-14
Publication date: 2009-05-20
Anticipated expiration: 2025-04-14
Also published as: CN1848707A

Abstract

The present invention provides an adaptive bandwidth adjustment method for packet data services, comprising the following steps: A. The PDCP entity performs protocol type statistics on downlink packet data packets, determines that the currently dominant protocol type is TCP or non-TCP type, and reports To the radio resource control RRC entity; the PDCP/RLC entity counts the throughput/traffic volume of the downlink packet data packet, and reports the statistical report of the downlink throughput/traffic volume to the RRC entity by means of an event report; B. The RRC entity judges the current dominant Whether the protocol type is TCP, if yes, the bandwidth of the downlink packet data service is adjusted using the downlink traffic statistics report reported by the RLC entity; otherwise, the bandwidth of the downlink packet data service is adjusted using the downlink throughput statistics report reported by the PDCP entity. By using the invention, the packet data service can be adaptively adjusted to the bandwidth according to the characteristics of the used protocol type.

Description

A kind of adaptive bandwidth regulating method of Packet data service

Technical field

The present invention relates to WCDMA radio resource management techniques field, be meant a kind of adaptive bandwidth regulating method of Packet data service especially.

Background technology

From the theoretical actual conditions of CDMA, the capacity of cdma system generally all is that downlink bandwidth is limited.Along with further carrying out of data service, the throughput demand of descending reality can be far longer than up, and the limited problem of downlink bandwidth will be more serious.Present disclosed Multiuser Detection (MUD) technology will further improve up capacity, and disclosed smart antenna (SA) is not so good as up big descending improvement though technology has the improvement effect to descending and last provisional capital.In this case, downlink bandwidth just becomes a kind of relatively more precious resource in the cdma system.

Fig. 1 (selecting from 3GPP TS 25.301 agreements) is the air interface protocol structure of WCDMA system.For a PS (Packet Service) Packet data service, the protocol entity that needs to set up comprises L3/RRC, L2/PDCP, L2/RLC, L2/MAC and L1/PHY, wherein L2/PDCP represents the PDCP entity of the second layer, PDCP (Packet Data Convergence Protocol, PDCP) only is used for the PS Packet Service, mainly realizes a compression function of IP packet and the lossless migration of supporting Packet Service.

Characteristics such as that the PS Packet data service has is sudden, the rate dynamic excursion is big, in order to improve the utilization ratio of system descending bandwidth, for these business can carry out according to the real-time requirement of business dynamically, reasonably bandwidth adjustment.At present, generally all be downlink traffic (measuring) or PS packet data package throughput (measuring) at the MAC layer at rlc layer by monitoring PS Packet data service, estimate the source speed that this is professional, and then downlink bandwidth is adjusted.This scheme has realized the adaptive bandwidth adjustment of Packet data service to a certain extent, but this adaptive bandwidth adjustment is not very accurate, analyzes below.

According to ICP/IP protocol, an IP packet data carried by data, its protocol type comprises TCP, UDP, ICMP and IGMP etc.Transmission Control Protocol has carried out the source rate controlled to the upper-layer service of its carrying, so WCDMA UTRAN side to the data rate measurement result of Transmission Control Protocol encapsulation, is not the real source speed of TCP business; Though other non-Transmission Control Protocol do not carry out the source rate controlled to business, but the measuring business volume of RLC itself can not accurately reflect non-Transmission Control Protocol data source speed, and the throughput of MAC also is subjected to the restriction of physical layer bandwidth and can't really embody the source rate requirement of non-TCP business.

In sum, present employed Packet data service monitoring means is not considered the influence of the characteristic of different agreement type to the data source speed of arrival WCDMA UTRAN side, can not accurately estimate the source rate requirement of Packet data service, thereby the accuracy of this adaptive bandwidth adjustment can't be effectively guaranteed.

Summary of the invention

In view of this, main purpose of the present invention is to provide a kind of adaptive bandwidth regulating method of Packet data service, can make Packet data service according to the characteristic of institute's use agreement type bandwidth be carried out the self adaptation adjustment.

The invention provides a kind of adaptive bandwidth regulating method of Packet data service, be used for bandwidth adjustment to the downlink grouped data business, set up corresponding PDCP PDCP entity, Radio Link control RLC entity when setting up the downlink grouped data business, this method is further comprising the steps of:

A, PDCP entity carry out the protocol type statistics to the downlink grouped data bag, determine that current prevailing protocol type is TCP or non-TCP type, and the current prevailing protocol type that will determine report the radio resource control RRC entity;

The PDCP entity is added up the throughput of downlink grouped data bag, and reports the statistical report of downlink throughput capacity to the RRC entity; The RLC entity is added up downlink traffic, and reports the statistical report of downlink traffic to the RRC entity;

B, RRC entity judge whether current leading protocol type is TCP, is, the downlink traffic statistical report that then adopts the RLC entity to report is adjusted the bandwidth of downlink grouped data business; Otherwise the downlink throughput capacity statistical report that adopts the PDCP entity to report is adjusted the bandwidth of downlink grouped data business.

Wherein, the implication of described current leading protocol type is: the difference of this protocol type and the shared percentage of another protocol type packet is greater than certain value, and the scope of this value is 0～99%, should the fixing use 0 of value for first measurement period.

Wherein, the described step that the downlink grouped data bag is carried out protocol type statistics of steps A is: determine whether the protocol domain information in each packet data package represents the Transmission Control Protocol type; Add up certain interior Transmission Control Protocol type of cycle and shared separately percentage of non-Transmission Control Protocol type packet packet.

Preferable, the step that the current prevailing protocol type that steps A will be determined reports further comprises: judge that prevailing protocol type reports when changing

Wherein, steps A further comprises: adopt the mode of event report to trigger reporting of statistical report.

Optionally, the mode of described event report comprises: for statistical report report cycle setup time, when arriving a time cycle, report statistical report.

Optionally, the mode of described event report comprises: for statistical report report configuration Upper threshold, Lower Threshold and lag time parameter, when statistics greater than Upper threshold or less than Lower Threshold, and when satisfying lag time, report statistical report.

Preferable, for the shared different bandwidth of Packet data service disposes different described Upper threshold, Lower Threshold and lag time parameter.

Wherein, further comprise after the bandwidth of downlink grouped data business is adjusted: report employed Upper threshold, Lower Threshold, the lag time that upgrade PDCP entity and RLC entity triggers statistical report are that the pairing triggering statistical report of current bandwidth reports employed Upper threshold, Lower Threshold, lag time; Return steps A then.

Wherein, the downlink traffic statistical report that reports of described employing RLC entity step that the bandwidth of downlink grouped data business is adjusted comprises: when traffic carrying capacity surpasses Upper threshold, for business is reshuffled maximum available bandwidth; When traffic carrying capacity is lower than Lower Threshold, for business is reshuffled minimum available wide.

Wherein, the downlink throughput capacity statistical report that reports of described employing PDCP entity step that the bandwidth of downlink grouped data business is adjusted comprises: when throughput surpasses Upper threshold, for business is reshuffled the bandwidth bigger slightly than current throughput; When throughput is lower than Lower Threshold, for business is reshuffled the bandwidth bigger slightly than current throughput.

By said method as can be seen, the present invention carries out real-time tracking by the protocol type to data, and adopt based on the bandwidth adjustment of RLC downlink traffic and PDCP downlink throughput capacity tactful respectively at different protocol type (TCP and non-TCP type), make it possible to follow the tracks of in real time and exactly the variation of the used protocol type of Packet Service and the variation demand of data volume, the specific aim and the reasonability of bandwidth adjustment are strengthened greatly, under the prerequisite that guarantees service quality, can save the downlink bandwidth resource of system very effectively.

Description of drawings

Fig. 1 is a WCDMA air interface protocol structure chart.

Fig. 2 adjusts flow chart for the Packet data service bandwidth self-adaption.

Embodiment

Because Transmission Control Protocol has carried out the source rate controlled to the upper-layer service of its carrying, but not Transmission Control Protocol does not carry out the source rate controlled to the upper-layer service of its carrying, so the present invention is divided into two types of TCP and non-TCP according to this characteristic with the packet of receiving, and carry out the adaptive bandwidth adjustment according to characteristics separately.With reference to the accompanying drawings 2, the adaptive bandwidth regulating method at Packet data service that the present invention is proposed is elaborated, and may further comprise the steps:

Step 201: after RNC (radio network controller) receives that descending PS Packet data service is set up request, distribute a suitable initial bandwidth according to sub-district present load and other resource situation, and set up corresponding PDCP (PDCP), RLC examples such as (Radio Link controls).This step is a general step of setting up in the PS Packet data service step, is identical with prior art, so be not described in detail this step.

Step 202: after Packet data service is set up, the PDCP entity is added up the protocol type of downlink service data, PDCP adds up according to given measurement period, determines current leading protocol type, and the implication of leading protocol type is the protocol type that occupies main ratio.

We know that each IP packet all carries the protocol domain of one 8 bit, show the upper-layer protocol type of this packet carrying, and PDCP promptly adds up by the agreement that the IP packet that arrives the PDCP layer is carried.In this example, all possible protocol type is classified as two kinds of TCP and non-TCP, statistics TCP and the shared separately percentage of non-TCP type data packets, both sums are 100%.

PDCP according to given measurement period, and the prevailing concrete standard of agreement (surpass non-tcp data bag proportion as the shared ratio of tcp data bag and reach predetermined value, just think that current leading protocol type is TCP), judge whether current leading protocol type changes, when leading protocol type changes, in time notify RRM (the RRM module in RRC (Radio Resource control) entity, be a known functional module in the rrc layer, main being responsible for as wireless resource allocation and management functions such as channel width, power).

The leading protocol type that RRM module in the RRC entity reports according to PDCP, real-time update are recorded in the current leading protocol type in the RRC entity.

In step 202, the PDCP entity also to downlink service data carry out throughput statistics, the RLC entity also will be added up downlink traffic.And adopt the downlink throughput capacity/traffic carrying capacity of event mode PDCP/RLC entity reporting service to change.Described employing event mode can for: when the downlink throughput capacity/traffic carrying capacity of PDCP/RLC entity statistics surpasses given Upper threshold or is lower than given Lower Threshold and satisfies lag time, then to RRM module reporting measurement reports.Wherein, the Upper threshold of described throughput/traffic carrying capacity, Lower Threshold and lag time parameter are pre-configured.Be understood that, described employing event mode can also for: regularly report or surpass mode that threshold value reports etc.

The RRM module is adjusted according to the different down-run survey report triggering of the leading protocol type selective reception of current difference bandwidth in the step 203:RRC entity, and is specific as follows:

When current leading agreement is TCP, and when receiving the downlink traffic report that RLC reports, the RRM module triggers the bandwidth adjustment.For the TCP business, the traffic carrying capacity of RLC change embodied treat the sending service data what (for the TCP business, active rate controlled, therefore the TCP maximum bandwidth that can use its lower floor as far as possible and provided, therefore the RLC traffic carrying capacity changes the variation that can embody the TCP traffic data), so when traffic carrying capacity surpasses Upper threshold, illustrate that traffic carrying capacity is bigger, then distribute a bigger bandwidth, business is reconfigured on the high bandwidth of trying one's best; Otherwise then traffic carrying capacity is lower than the situation of Lower Threshold, for business is reshuffled less bandwidth.

When current leading agreement is non-TCP, and when the RRM module is received the downlink throughput capacity report that PDCP reports, trigger the bandwidth adjustment, and be that downlink business is adjusted bandwidth according to the downlink throughput capacity that PDCP reports.In downlink transfer, for non-TCP business, owing to there is not rate controlled, so the downlink throughput capacity of PDCP layer and service source speed ratio are more approaching, the bandwidth of (because PDCP is adjacent with Non-Access Stratum, the measurement of its throughput can reflect the source speed of upper layer data bag) configuration can be fully with reference to current downlink throughput capacity.Throughput is surpassed Upper threshold or is lower than two kinds of situations of Lower Threshold, consider that the transmission of eating dishes without rice or wine is certain to exist some mistake pieces to retransmit, therefore to satisfy current throughput requirement in order guaranteeing, when business is reshuffled, to be configured on the big slightly bandwidth of goodput that a ratio measures.

Through above-mentioned steps, just finished a service bandwidth adjustment.Wherein, the professional shared different bandwidth of current grouped data disposes different above-mentioned Upper threshold, Lower Threshold and lag time parameter.Therefore after a service bandwidth adjustment finishes, reshuffle respectively that PDCP and RLC measure employed thresholding and lag time is the professional pairing parameter of current grouped data, return step 202 then and enter next time service bandwidth adjustment.

The present invention carries out real-time tracking by the protocol type to data, and adopt based on the bandwidth adjustment of RLC downlink traffic and PDCP downlink throughput capacity tactful respectively at different protocol types, follow the tracks of the variation of the used protocol type of Packet Service and the variation demand of data volume in real time and exactly, the specific aim and the reasonability of bandwidth adjustment are strengthened greatly, under the prerequisite that guarantees service quality, save the downlink bandwidth resource of system very effectively.

The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims

1. An adaptive bandwidth adjustment method for packet data services, which is used to adjust the bandwidth of downlink packet data services. When establishing downlink packet data services, a corresponding packet data convergence protocol PDCP entity and radio link control RLC entity are established. Characteristically, the method also includes the following steps:

A. The PDCP entity performs protocol type statistics on downlink packet data packets, determines that the currently dominant protocol type is TCP or non-TCP type, and reports the determined currently dominant protocol type to the radio resource control RRC entity;

The PDCP entity performs statistics on the throughput of downlink packet data packets, and reports the statistical report of the downlink throughput to the RRC entity;

The RLC entity performs statistics on the traffic volume of the downlink packet data service, and reports the statistics report of the downlink traffic volume to the RRC entity;

B. The RRC entity judges whether the current dominant protocol type is TCP, if yes, adjust the bandwidth of the downlink packet data service using the downlink traffic statistics report reported by the RLC entity; otherwise, use the downlink throughput statistics report reported by the PDCP entity to adjust the downlink packet The bandwidth of the data service is adjusted.

2. The method according to claim 1, wherein the step of performing protocol type statistics on downlink packet data packets in step A is: determining whether the protocol field information in each packet data packet represents the TCP protocol type; and In this way, the respective percentages of TCP protocol type and non-TCP protocol type packet data packets in a certain period are counted.

3. The method according to claim 1, wherein the step of determining that the currently dominant protocol type in step A is TCP comprises: judging the difference between the percentage of TCP protocol type and non-TCP protocol type data packets greater than a set value.

4. The method according to claim 1, wherein the step of reporting the determined currently dominant protocol type in step A further comprises: reporting when it is determined that the dominant protocol type changes.

5. The method according to claim 1, characterized in that step A further comprises: triggering the reporting of statistical reports by way of event reporting.

6. The method according to claim 5, wherein the method of event reporting comprises: configuring a time period for reporting the statistical report, and reporting the statistical report when a time period is reached.

7. The method according to claim 5, wherein the method of event reporting comprises: configuring an upper threshold, a lower threshold, and a delay time parameter for the report of a statistical report, and when the statistical result is greater than the upper threshold or smaller than the lower threshold, And when the lag time is satisfied, a statistical report is submitted.

8. The method according to claim 7, characterized in that different parameters of the upper threshold, lower threshold and delay time are configured for different bandwidths occupied by packet data services.

9. The method according to claim 8, characterized in that after adjusting the bandwidth of the downlink packet data service, it further comprises: updating the upper threshold, lower threshold, and lag time used by the PDCP entity and the RLC entity to trigger the report of the statistical report Report the upper threshold, lower threshold, and lag time used for the trigger statistics report corresponding to the current bandwidth; then return to step A.

10. The method according to claim 7, wherein the step of adjusting the bandwidth of the downlink packet data service using the downlink traffic statistics report reported by the RLC entity comprises: when the traffic exceeds the upper threshold, reconfigure for the service The maximum available bandwidth; when the business volume is lower than the lower threshold, reconfigure the minimum available bandwidth for the business.

11. The method according to claim 7, wherein the step of adjusting the bandwidth of the downlink packet data service by using the downlink throughput statistical report reported by the PDCP entity comprises: when the throughput exceeds the upper threshold, reconfigure for the service A bandwidth slightly larger than the current throughput; when the throughput is lower than the lower threshold, reconfigure a bandwidth slightly larger than the current throughput for the business.