CN1893715A - Method and apparatus for optimizing communication quality in mobile wireless wide-band accessing system - Google Patents

Method and apparatus for optimizing communication quality in mobile wireless wide-band accessing system Download PDF

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CN1893715A
CN1893715A CNA200510035677XA CN200510035677A CN1893715A CN 1893715 A CN1893715 A CN 1893715A CN A200510035677X A CNA200510035677X A CN A200510035677XA CN 200510035677 A CN200510035677 A CN 200510035677A CN 1893715 A CN1893715 A CN 1893715A
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threshold condition
monitor value
base station
mss
travelling carriage
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朱静宁
王栋耀
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Abstract

The invention discloses method and device for optimizing quality of communication in mobile wireless broadband access system. The method includes (1) monitoring parameters of quality of service (QoS); (2) comparing the monitored value with threshold condition; when the monitored value meets the threshold condition, triggering scanning, hard switching, or fast base station switching procedures. The invention provides more reference conditions for triggering scanning, switching, or fast base station switching procedures so as to make system provide high QoS for users.

Description

Optimize the method and the device of communication quality in a kind of mobile wireless wide-band accessing system
Technical field
The invention belongs to moving communicating field, relate in particular to method and the travelling carriage of optimizing driver sweep, switching and fast base station handoff procedure in the mobile wireless wide-band accessing system.
Background technology
802.16e be that a kind of mobile wireless wide-band that ieee standard is organized to set up inserts standard.IEEEStandard 802.16-2004 provides the frame structure of mobile wireless wide-band accessing system, and the present invention all quotes at this.As shown in Figure 1, mobile wireless wide-band accessing system is made up of BS (Base Station, base station) and MSS (Mobile Subscribe Station, travelling carriage) two parts, and the electromagnetic wave that transmits and receives by radio receiving-transmitting unit between BS and the MSS communicates.Each BS has certain coverage, if exceeded its coverage, communication will be interrupted.A BS can communicate with a plurality of MSS in its coverage, and the signal that BS sends to MSS is called downstream signal, and the signal that MSS sends to BS is called upward signal.The limited coverage area of each BS, still a plurality of BS link together with certain rule and just can constitute covering cordless communication network in a big way, and the MSS in network coverage can keep communicating by letter normally with BS.A common MSS only keeps communicating by letter with a BS, and this BS just is called the serving BS broadcasts of this MSS.
Because MSS is transportable, and BS is fixed, the coverage of each BS is again limited, so some constantly along with MSS move when it from current serving BS broadcasts more and more far the time, communication quality between the two just becomes worse and worse, so that no longer can satisfy the communication quality requirement, and MSS just needs to break away from original BS in this case, be transformed into one new satisfy under the BS that communication quality requires work on, this process just is called switching.Generally speaking, switch to another BS from a BS and be called direct-cut operation.But at some in particular cases when a MSS moves to the crossover region of a plurality of BS coverages, it may keep simultaneously communicating by letter with a plurality of BS, these BS have just constituted the Active Set of this MSS, the content of communicating by letter between a plurality of BS in MSS and the Active Set is identical, the BS that promptly is in the Active Set is identical to the data that MSS sends, the data that receive from MSS are also identical, and this process is called soft handover.Fast base station switches with soft handover similar, all has an Active Set.In the soft handover of MSS, all BS in the Active Set all set up communication link with MSS, and in fast base station switches, have only a BS and MSS to set up communication link in the Active Set in the same time, and this BS is called Anchor BS.MSS can select BS to switch in Active Set fast, promptly upgrades Anchor BS.
For the continuity that guarantees to communicate by letter, reduce owing to switch the communication interruption of being brought, MSS also needs often to detect the signal quality of neighbor bss when keeping normal communications status with BS, and to seek potential switchable target BS, this process is called scanning.Can switch to new communication quality BS preferably rapidly when so in a single day the switching demand being arranged.About switch and the content of scanning referring to IEEE Standard802.16e/D8-2005, the present invention all quotes at this.
IEEE Standard 802.16e:C80216e-05_129r2: " Additional Scan MeasurementMetric, Triggers and Reporting Modes " provides a kind of scan report and changing method based on event trigger mechanism.This method defines multiple incident, comprise RSSI (Receiver Signal StrengthIndicator, the indication of received signal intensity) measures average, CINR (Carrier-Interference-Noise-Rate, the carrier-in-interference noise ratio) measures average, RTD (Round Time Delay, round-trip delay) and relative time delay etc.By these incidents being measured and being contrasted, satisfying the corresponding scanning of triggering and report mechanism or switching under the situation of certain criterion with the absolute or relative threshold value that sets.
Along with the differentiation of mobile communication from the circuit-switched network to the packet switching network, in wireless network,, the user supports to have become a kind of inevitable trend for providing QoS (Quality of Service, service quality).When switching, it is an important consideration aspect that selection can provide the network of best service quality, when the service quality that monitors Serving cell and provide as MSS can't satisfy business demand, just needs to activate the scanning and the handoff procedure of neighbor cell; Perhaps in fast base station BS handoff procedure,, then need to trigger the renewal of Anchor BS etc. if MSS monitors Anchor BS (anchor base stations) in the Active Set can't satisfy the QoS demand time.In the handover scheme that the 802.16e agreement provides, the consideration of QoS is not related to.
Summary of the invention
The objective of the invention is in the 802.16e system, the QoS quality that BS is provided also as a parameter of MSS driver sweep, switching and fast base station handoff procedure, guarantees for the user provides high-quality QoS.
In order to realize goal of the invention, the invention provides the method for optimizing communication quality in a kind of mobile wireless wide-band accessing system, described method comprises:
A. monitor the QoS parameter that communicates to connect;
B. monitor value is compared with threshold condition, when monitor value satisfies threshold condition, driver sweep, direct-cut operation or fast base station handoff procedure.
Described step B further comprises:
B1. monitor value is compared with the scanning threshold condition, when monitor value satisfied described scanning threshold condition, the driver sweep process sent the scan request administrative messag to serving BS;
B2. monitor value is compared with the scan report threshold condition, when monitor value satisfies described scan report threshold condition, the driver sweep reporting process.
Described step B further comprises:
Monitor value is compared with the direct-cut operation threshold condition, when monitor value satisfies described direct-cut operation threshold condition, trigger direct-cut operation, send the handoff request administrative messag to serving BS.
Described step B further comprises:
Monitor value is compared with fast base station handoff threshold condition, when monitor value satisfies described fast base station handoff threshold condition, trigger the fast base station handoff procedure, send the handoff request administrative messag to anchor base stations.
Described QoS parameter is block error rate BLER, transmission rate Rate or packet delay Delay.
In order to realize goal of the invention better, the present invention further provides the travelling carriage in a kind of mobile wireless wide-band accessing system, described travelling carriage comprises:
The parameter monitoring module is used to monitor the QoS parameter that communicates to connect;
Trigger control module is used for monitor value and threshold condition are compared, and when monitor value satisfies threshold condition, triggers scanning, switching or the fast base station handoff procedure of described travelling carriage.
Described trigger control module further comprises the scan control module, be used for monitor value and scanning threshold condition are compared, when monitor value satisfies described scanning threshold condition, trigger the scanning process of described travelling carriage, send the scan request administrative messag to serving BS; And
The scan report control module is used for monitor value and scan report threshold condition are compared, and when monitor value satisfies described scan report threshold condition, triggers the scan report process of described travelling carriage.
Described trigger control module further comprises the direct-cut operation control module, be used for monitor value and direct-cut operation threshold condition are compared, when monitor value satisfies described direct-cut operation threshold condition, trigger the direct-cut operation of described travelling carriage, send the handover management request message to serving BS.
Described trigger control module further comprises fast base station switching controls module, be used for monitor value and fast base station handoff threshold condition are compared, when monitor value satisfies described fast base station handoff threshold condition, trigger the fast base station handoff procedure of described travelling carriage, send the handover management request message to anchor base stations.
Described QoS parameter is block error rate BLER, transmission rate Rate or packet delay Delay.
The present invention can provide more reference conditions for MSS driver sweep, switching or fast base station handoff procedure, and the system that makes can provide high-quality QoS service to the user.
Description of drawings
Fig. 1 is the network figure of mobile wireless wide-band accessing system;
Fig. 2 is the realization flow figure of MSS driver sweep process among the present invention;
Fig. 3 is the realization flow figure that MSS triggers direct-cut operation among the present invention;
Fig. 4 is that MSS triggers the realization flow figure that fast base station switches among the present invention;
Fig. 5 is the structural representation of MSS provided by the invention.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
On the basis of the triggering method that scanning, switching and the fast base station that the present invention provides in existing 802.16e system switches qos parameter is set, trigger the condition that adjacent domain scanning, switching and fast base station switch as MSS, system can be guaranteed for the user provides high-quality QoS.Referring to Fig. 1, in the present invention, the qos parameter that communicates to connect between MSS monitoring and the BS, as described below, qos parameter can be the combination of parameter such as block error rate BLER, transmission rate Rate or packet delay Delay or these parameters.Whether MSS satisfies the threshold condition of setting according to monitor value judgement monitor value, when monitor value satisfies the threshold condition of setting, triggers relevant operations such as adjacent domain scanning, switching and fast base station switching.
Fig. 2 shows the realization flow of MSS driver sweep among the present invention, and details are as follows:
Among the step S201, at the appointed time monitor the qos parameter that communicates to connect in the section, obtain the monitor value of relevant parameter;
Among the step S202, judging whether monitor value satisfies the adjacent domain scanning threshold condition, is execution in step S203 then, otherwise continues execution in step S201;
Among the step S203, trigger the adjacent domain scanning process, send MOB_SCAN-REQ scan request administrative messag to serving BS broadcasts;
Among the step S204, at the appointed time monitor the qos parameter that communicates to connect in the section;
Among the step S205, judging whether monitor value satisfies the scan report threshold condition, is execution in step S206 then, otherwise finishes;
Among the step S206, the driver sweep reporting process sends scan report message to serving BS broadcasts, and continues execution in step S204.
Fig. 3 shows the realization flow that MSS triggers direct-cut operation, and details are as follows:
Among the step S301, at the appointed time monitor the qos parameter that communicates to connect in the section, obtain the monitor value of relevant parameter;
Among the step S302, judging whether monitor value satisfies the direct-cut operation threshold condition, is execution in step S303 then, otherwise continues execution in step S301;
Among the step S303, trigger direct-cut operation, MSS sends MOB_MSHO-REQ handoff request administrative messag to serving BS broadcasts.
Fig. 4 shows MSS and triggers the realization flow that fast base station switches, and details are as follows:
Among the step S401, at the appointed time monitor the qos parameter that communicates to connect in the section, obtain the monitor value of relevant parameter;
Among the step S402, judge whether monitor value satisfies the threshold condition that fast base station switches, be execution in step S403 then, otherwise continue execution in step S401;
Among the step S403, trigger the fast base station handoff procedure, MSS sends MOB_MSHO-REQ handoff request administrative messag to Anchor BS, promptly upgrades Anchor BS.
As one embodiment of the present of invention, adopt block error rate BLER (Block Error Rate) to describe the QoS that BS can provide.The calculating of Block Error Rate is a mean value, is meant the mean value of Block Error Rate in the certain hour section, BLER = B sum , Wherein, B is the number of data blocks that makes a mistake that MSS receives in the time T; Sum is total number of data blocks that MSS receives in the same time T.
(1) for the triggering of scanning, if the BLER of the down link of MSS Monitoring Service BS is at Δ T 1In, the monitor value of MSS judgement BLER is always greater than the threshold value E that sets Min, then triggering the adjacent domain scanning process of MSS, MSS sends MOB_SCAN-REQ scan request administrative messag to serving BS broadcasts.Thereafter, if the BLER of the down link of MSS Monitoring Service BS is at Δ T 1In, the monitor value of MSS judgement BLER is always greater than the threshold value E that sets Min, then trigger the scan report process of MSS.
(2) for the triggering of direct-cut operation, if at Δ T 2In, the monitor value of MSS judgement BLER is always greater than the threshold value E that sets Max(E Max＞E Min), then triggering the handoff procedure of MSS, MSS sends MOB_MSHO-REQ handoff request administrative messag to serving BS broadcasts.
(3) triggering of switching for fast base station, the BLER of the down link of the Anchor BS in the MSS monitoring Active Set is for this Anchor BS, if at Δ T 3In, the monitor value of BLER then triggers the fast base station handoff procedure of MSS always greater than the threshold value E that sets, and MSS sends MOB_MSHO-REQ handoff request administrative messag to Anchor BS, promptly reselects new Anchor BS.
In another one embodiment of the present invention, adopt transmission rate Rate to describe the QoS that BS can provide.The calculating of transmission rate is undertaken by the following formula recurrence formula:
R i ( k ) = α · R i ( k - 1 ) + ( 1 - α ) · Q i ( k ) T f , T in the formula fBe the frame length of system, 0＜α＜1, Q i(k) be that certain connects the i data quantity transmitted in the k frame.
All loaded service to MSS connect the statistics of all carrying out transmission rate by following formula, and to all connections (i=0,1,2 ... ..N) make the following judgment:
(1) for the triggering of scanning, MSS monitors certain transmission rate Rate that connects i, if at Δ T 1In, MSS judges the monitor value R of Rate i(k) with the minimum transmission rate R that is connected the i setting MinDifference always less than the threshold value E that sets Max, i.e. R i(k)-R Min(i)＜E Max, then triggering the adjacent domain scanning process of MSS, MSS sends MOB_SCAN-REQ scan request administrative messag to serving BS broadcasts.Thereafter, if at Δ T 1In, MSS judges the monitor value R of Rate i(k) with the minimum transmission rate R that is connected the i setting MinDifference always less than the threshold value E that sets Max, i.e. R i(k)-R Min(i)＜E Max, then trigger the scan report process of MSS.
(2) for the triggering of direct-cut operation, if at Δ T 2In, MSS judges the monitor value R of Rate i(k) with the minimum transmission rate R that is connected the i setting MinDifference always less than the threshold value E that sets Min(E Min＜E Max), i.e. R i(k)-R Min(i)＜E Min, then triggering the handoff procedure of MSS, MSS sends MOB_MSHO-REQ handoff request administrative messag to serving BS broadcasts.
(3) triggering of switching for fast base station, MSS monitors the transmission rate Rate that certain connects i at the Anchor BS in the Active Set.For this Anchor BS, if at Δ T 3In, the monitor value R of Rate i(k) with the minimum transmission rate R that is connected the i setting MinDifference always less than the threshold value E that sets, i.e. R i(k)-R Min(i)＜and E, then trigger the handoff procedure of MSS, MSS sends MOB_MSHO-REQ handoff request administrative messag to Anchor BS, promptly reselects new Anchor BS.
As another one embodiment of the present invention, adopt packet delay Delay to describe the QoS that BS can provide.The calculating of packet delay Delay is undertaken by the following formula recurrence formula:
Delay i(k)＝α·Delay i(k-1)+(1-α)·delay，0＜α＜1。
Delay is certain packet delay that connects i in the k frame.
All loaded service to MSS connect the statistics of all carrying out packet delay by following formula, and to all connections (i=0,1,2 ... ..N) make the following judgment:
(1) for the triggering of scanning and scan report, MSS monitors certain packet delay Delay that connects i, if at Δ T 1In, MSS judges the monitor value Delay of Delay i(k) require L with the maximum delay that is connected the i setting MaxDifference always greater than the threshold value E that sets Min, i.e. Delay i(k)-L Max(i)＞E Min, then triggering the scanning process of MSS, MSS sends MOB_SCAN-REQ scan request administrative messag to serving BS broadcasts.Thereafter, if at Δ T 1In, MSS judges the monitor value Delay of Delay i(k) require L with the maximum delay that is connected the i setting MaxDifference always greater than the threshold value E that sets Min, i.e. Delay i(k)-L Max(i)＞E Min, then trigger the scan report process of MSS.
(2) for the triggering of direct-cut operation, if at Δ T 2In, MSS judges the monitor value Delay of Delay i(k) require L with the maximum delay that is connected the i setting MaxDifference always greater than the threshold value E that sets Max(E Min＜E Max), i.e. Delay i(k)-L Max(i)＞E Max, then triggering the handoff procedure of MSS, MSS sends MOB_MSHO-REQ handoff request administrative messag to serving BS broadcasts.
(3) triggering of switching for fast base station BS, MSS monitors the packet delay Delay that certain connects i at the Anchor BS in the Active Set.For this Anchor BS, if at Δ T 3In, the monitor value Delay of Delay i(k) require L with the maximum delay that is connected the i setting MaxDifference always greater than the threshold value E that sets, i.e. Delay i(k)-L Max(i)＞and E, then trigger the handoff procedure of MSS, MSS sends MOB_MSHO-REQ handoff request administrative messag to Anchor BS, promptly reselects new Anchor BS.
Fig. 5 shows the structural representation of MSS among the present invention, for convenience of description, part related to the present invention only is shown.
MSS comprises parameter monitoring module 100, be used to monitor the service quality QoS parameter that communicates to connect between MSS and the BS, as mentioned above, can be the combination of parameters such as block error rate BLER, transmission rate Rate or packet delay Delay or these parameters, and the monitor value of qos parameter is sent to trigger control module 200.
The monitor value that trigger control module 200 sends according to parameter monitoring module 100, monitor value is compared with the threshold condition of setting, when monitor value satisfies threshold condition, trigger the associative operation process of MSS, the calculating of concrete monitor value and threshold condition more as mentioned above, repeat no more.
When monitor value satisfied the scanning threshold condition, scan control module 201 triggered the scanning process of MSS, and sent MOB_SCAN-REQ transmission scan request administrative messag to serving BS broadcasts;
When monitor value satisfied the scan report threshold condition, scan report control module 202 triggered the scan report process of MSS;
When monitor value satisfied the direct-cut operation threshold condition, direct-cut operation control module 203 triggered the direct-cut operation of MSS, and sent MOB_MSHO-REQ handoff request administrative messag to serving BS broadcasts;
When monitor value satisfied fast base station handoff threshold condition, fast base station switching controls module 204 triggered the fast base station handoff procedure of MSS, and sent MOB_MSHO-REQ handoff request administrative messag to Anchor BS, promptly reselected new Anchor BS.
Above-mentioned parameter monitoring modular 100, trigger control module 200, scan control module 201, scan report control module 202, direct-cut operation control module 203 and fast base station switching controls module 204 can realize by software, is carried in the internal memory of MSS to move.
The above only is preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of being done 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, optimize the method for communication quality in a kind of mobile wireless wide-band accessing system, it is characterized in that described method comprises:
A. monitor the QoS parameter that communicates to connect;
B. monitor value is compared with threshold condition, when monitor value satisfies threshold condition, driver sweep, direct-cut operation or fast base station handoff procedure.
2, the method for claim 1 is characterized in that, described step B further comprises:
B1. monitor value is compared with the scanning threshold condition, when monitor value satisfied described scanning threshold condition, the driver sweep process sent the scan request administrative messag to serving BS;
B2. monitor value is compared with the scan report threshold condition, when monitor value satisfies described scan report threshold condition, the driver sweep reporting process.
3, the method for claim 1 is characterized in that, described step B further comprises:
Monitor value is compared with the direct-cut operation threshold condition, when monitor value satisfies described direct-cut operation threshold condition, trigger direct-cut operation, send the handoff request administrative messag to serving BS.
4, the method for claim 1 is characterized in that, described step B further comprises:
Monitor value is compared with fast base station handoff threshold condition, when monitor value satisfies described fast base station handoff threshold condition, trigger the fast base station handoff procedure, send the handoff request administrative messag to anchor base stations.
As the described method of the arbitrary claim of claim 1 to 4, it is characterized in that 5, described QoS parameter is block error rate BLER, transmission rate Rate or packet delay Delay.
6, the travelling carriage in a kind of mobile wireless wide-band accessing system is characterized in that, described travelling carriage comprises:
The parameter monitoring module is used to monitor the QoS parameter that communicates to connect;
Trigger control module is used for monitor value and threshold condition are compared, and when monitor value satisfies threshold condition, triggers scanning, switching or the fast base station handoff procedure of described travelling carriage.
7, travelling carriage as claimed in claim 6, it is characterized in that, described trigger control module further comprises the scan control module, be used for monitor value and scanning threshold condition are compared, when monitor value satisfies described scanning threshold condition, trigger the scanning process of described travelling carriage, send the scan request administrative messag to serving BS; And
The scan report control module is used for monitor value and scan report threshold condition are compared, and when monitor value satisfies described scan report threshold condition, triggers the scan report process of described travelling carriage.
8, travelling carriage as claimed in claim 6, it is characterized in that, described trigger control module further comprises the direct-cut operation control module, be used for monitor value and direct-cut operation threshold condition are compared, when monitor value satisfies described direct-cut operation threshold condition, trigger the direct-cut operation of described travelling carriage, send the handover management request message to serving BS.
9, travelling carriage as claimed in claim 6, it is characterized in that, described trigger control module further comprises fast base station switching controls module, be used for monitor value and fast base station handoff threshold condition are compared, when monitor value satisfies described fast base station handoff threshold condition, trigger the fast base station handoff procedure of described travelling carriage, send the handover management request message to anchor base stations.
As the described travelling carriage of the arbitrary claim of claim 6 to 9, it is characterized in that 10, described QoS parameter is block error rate BLER, transmission rate Rate or packet delay Delay.
CNA200510035677XA 2005-06-30 2005-06-30 Method and apparatus for optimizing communication quality in mobile wireless wide-band accessing system Pending CN1893715A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101835230A (en) * 2010-03-09 2010-09-15 北京交通大学 Unified network mobile terminal automatic switching method
CN102427594A (en) * 2011-12-30 2012-04-25 华为技术有限公司 Method, device and system for determining carrier according to QoS (Quality of Service)
CN102986272A (en) * 2010-06-09 2013-03-20 京瓷株式会社 Radio communication system, radio base station, radio terminals and communication control method
CN101690316B (en) * 2007-06-28 2013-10-30 高通股份有限公司 Maintaining minimum quality of service (QoS) communication sessions during hard handoffs
CN104349429A (en) * 2013-08-08 2015-02-11 财团法人工业技术研究院 Method of handling anchor-based mobility management

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101690316B (en) * 2007-06-28 2013-10-30 高通股份有限公司 Maintaining minimum quality of service (QoS) communication sessions during hard handoffs
CN101835230A (en) * 2010-03-09 2010-09-15 北京交通大学 Unified network mobile terminal automatic switching method
CN101835230B (en) * 2010-03-09 2013-07-03 北京交通大学 Unified network mobile terminal automatic switching method
CN102986272A (en) * 2010-06-09 2013-03-20 京瓷株式会社 Radio communication system, radio base station, radio terminals and communication control method
CN102427594A (en) * 2011-12-30 2012-04-25 华为技术有限公司 Method, device and system for determining carrier according to QoS (Quality of Service)
WO2013097789A1 (en) * 2011-12-30 2013-07-04 华为技术有限公司 Method, device and system for determining carrier according to service of quality
CN104349429A (en) * 2013-08-08 2015-02-11 财团法人工业技术研究院 Method of handling anchor-based mobility management
CN104349429B (en) * 2013-08-08 2019-02-01 财团法人工业技术研究院 Handle the management method of mobile based on anchoring

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