WO2004057882A1 - Forward-link rate scheduling method and scheduler - Google Patents
Forward-link rate scheduling method and scheduler Download PDFInfo
- Publication number
- WO2004057882A1 WO2004057882A1 PCT/CN2002/000809 CN0200809W WO2004057882A1 WO 2004057882 A1 WO2004057882 A1 WO 2004057882A1 CN 0200809 W CN0200809 W CN 0200809W WO 2004057882 A1 WO2004057882 A1 WO 2004057882A1
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- WIPO (PCT)
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- scheduling
- user
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/52—Allocation or scheduling criteria for wireless resources based on load
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
- H04W28/18—Negotiating wireless communication parameters
Definitions
- the present invention relates to the field of data communications, and more particularly to a code division multiple access system forward link rate scheduling method and scheduler for providing high speed data services.
- BACKGROUND With the continuous expansion of the wireless service field and the rapid development of the Internet service, a simple call cannot meet the requirements of the user, and many users hope that the mobile communication system can provide the vast majority of the existing communication network (including ISDN, ADSL). Part of the business, therefore, in the new generation of mobile communication systems, the data service represented by multimedia services will dominate, which requires the system to provide more powerful support for data services and data and voice hybrid services, according to data services. The characteristics of reasonable and efficient use of wireless resources are the core to achieve this goal.
- the base station scheduling the rate allocated to these users is an important part of rational and effective use of the wireless resources.
- the paper "Downlink Scheduling in CDMA Data Networks" states that if the base station allocates available system resources to only one user at a time during scheduling, the utilization of the forward link can be maximized.
- this scheduling method tends to favor users with better channel environments. Those with relatively poor channel environments will have longer delays. This extreme unfairness will be unacceptable to users. Therefore, a good rate scheduling method should not only improve the utilization efficiency of wireless resources, but also ensure the fairness of users in the system.
- the rate scheduling method requires the base station to allocate the rate only according to the channel environment in which the user is located: a user with a good channel environment allocates a higher rate, and a user with a poor channel environment allocates a lower rate.
- a user with a good channel environment allocates a higher rate
- a user with a poor channel environment allocates a lower rate.
- the system resources can be utilized more effectively.
- the smoothness of scheduling refers to: When raising the priority of some users, the priority of other users in the system should not be drastically reduced, that is, the promotion and reduction of user priorities should be a smooth process.
- One object of the present invention is to provide a method for forward link rate scheduling in a communication network
- Another object of the present invention is to provide a means for forward link rate scheduling in a communication network.
- the present invention proposes the following technical solutions.
- the method for forward link rate scheduling of the present invention includes the following steps:
- a collecting the maximum scheduling resource information available to the system and scheduling the data service request information of the user; b, calculating the scheduling metric of the scheduling user, and the scheduling metric of the user includes the short-term scheduling metric, the long-term metric, and the normalized long-term scheduling metric;
- one scheduling period ends, wait and schedule the next cycle as described above.
- the step c of creating a scheduled user queue further includes the following steps:
- step c3 when detecting that the long-term scheduling metric of the active scheduling user is greater than the fixed threshold constant T1, proceed to the next step c4; otherwise, step c6 is directly performed.
- step c4 when the difference between the long-term scheduling metric of the activated scheduled user and the long-term scheduling metric of the inactive scheduling user is greater than the fixed threshold constant T2, step c5 is performed; otherwise, step c6 is directly performed.
- step e it is detected whether the system has available scheduling resources or the scheduling queue is empty. If it is not empty, if the returning step is empty, the scheduling metric of the scheduling user is updated first, and then the step is performed. The scheduling metric of the scheduling user is updated, and the following steps are further included in order:
- the target rate may be the request rate of the latest packet call arrival, or the maximum value of the latest scheduled rate of the scheduled user or the average value of the latest scheduled rate of the scheduled user;
- the scheduler for forward link rate scheduling of the present invention is included in a base station of a code division multiple access communication system, and the scheduler includes a memory, a timer, and a controller.
- the memory receives and saves data service request information of the scheduling user and maximum scheduling resource information of the system
- the output of the timer is connected to the controller, and the timer provides the required timing for the controller to perform forward link rate scheduling;
- the controller is bidirectionally connected to the memory, and the controller is configured to calculate a scheduling metric of the scheduling user, A scheduling user queue is constructed, a scheduling resource allocation rate is obtained according to the scheduling user queue and the system, and the user who obtains the resource is cleared from the scheduling user queue, and the allocation result is sent to the selector and the channel unit as the output of the scheduler.
- a scheduling metric of the scheduling user A scheduling user queue is constructed, a scheduling resource allocation rate is obtained according to the scheduling user queue and the system, and the user who obtains the resource is cleared from the scheduling user queue, and the allocation result is sent to the selector and the channel unit as the output of the scheduler.
- FIG. 2 is a schematic diagram showing the structure of a base station including the scheduler of the present invention.
- FIG. 3 is a schematic structural view of a scheduler of the present invention.
- FIG. 4 is a schematic flow chart of a scheduling method of the present invention.
- FIG. 5 is a schematic flowchart of a method for creating a scheduling user queue according to the present invention.
- the mobile station (MS) 107A or 107B is controlled by a base transceiver station (BTS) IOIA or 101B and a base station.
- the device (BSC) 105 A communicates, and at some point the mobile station may be in contact with both base stations at the same time.
- the mobile station 107B simultaneously communicates with the base transceiver stations 101A and 101B.
- the base station controller 105A in turn communicates with the PSTN or ISDN via the Mobile Switching Center (MSC) 103, and an MSC 103 can also be connected to other base station controllers 105B and the like.
- MSC Mobile Switching Center
- FIG. 2 illustrates a base station structure including a scheduler of the present invention.
- the data source 201 contains a large amount of packet data that needs to be transmitted to the remote mobile station 107.
- the data source 201 may also be located at the base station controller 105 or the mobile switching center 103 due to differences in actual system implementation.
- the selector unit 205 and the channel unit 207 are simultaneously controlled by the scheduler 203.
- the selector unit 205 transmits the packet data stored in the data source 201 to the channel unit 207, and the channel unit 207 pairs the selector.
- the data sent by unit 205 performs a series of processing, These processes typically include: adding control bits, adding CRC bits, adding tail bits, encoding, interleaving, Wlash quadrature modulation, PN short code modulation, and the like.
- transmitter 209 transmits the signal processed by the channel unit to the remote mobile station.
- FIG. 3 illustrates the internal structure of the scheduler, and the scheduler 203 includes a memory 301, a timer 303, and a controller. 305.
- the memory 301 is configured to save base station available scheduling resource information and data service request information.
- the available scheduling resource information of the base station includes resources, rates, orthogonal codes, channel units, and the like that the base station can allocate to the mobile station requesting the data service, and the data service request information includes the identification number of the mobile station applying for the data service, and the data amount of the mobile station. Request rate, scheduling metrics for mobile stations, recent scheduling rate, etc.
- the timer 303 provides the timing required for the controller 305 to perform forward link rate scheduling.
- the timer 303 can be implemented using a system clock, an oscillator on a circuit board that is locked to an external signal, or a receiver that is driven by a memory unit that is synchronized with an external source.
- the controller 305 performs rate scheduling on the mobile station having the data service request according to the information provided by the memory 301, and notifies the corresponding selector unit 205 and the channel unit 207 of the result of the rate scheduling.
- the method of the present invention provides a method for scheduling forward link data transmission in a code division multiple access communication system, in which at least one cell and at least one scheduled user are included.
- the method of the invention comprises the following steps:
- a collecting the maximum scheduling resource information available to the system and scheduling the data service request information of the user; b, calculating the scheduling metric of the scheduling user, and the scheduling metric of the user includes a short-term scheduling metric, a long-term metric, and a normalized long-term scheduling metric;
- one scheduling period ends, wait and schedule the next cycle as described above.
- each step is represented by a module.
- the controller 305 extracts the system maximum available scheduling resource information and data service request information from the memory 301, and the information is The controller performs the basis of rate scheduling.
- the controller 305 creates a scheduling user queue according to the scheduling metric of the user.
- controller 305 assigns a rate to the scheduling user in the order in which the user queues are scheduled, which rate allocation is limited by the currently available scheduling resources.
- controller 305 clears the scheduled user that obtained the rate allocation from the dispatch queue.
- the controller 305 notifies the corresponding selector unit 205 to transmit the scheduled user data to the channel unit 207, and the channel unit 207 is based on the controller.
- the rate assigned by 305 processes the data accordingly.
- controller 305 if the controller 305 detects that the system has available scheduling resources and the scheduling queue is not empty, the controller 305 repeats the flow of the modules 405-409; otherwise, directly executes the module 411, the scheduling metric for the scheduling user. Update. In block 413, controller 305 waits for the next scheduling cycle in accordance with the indication of timer 303 and repeats the flow of modules 401-411.
- step c When you create a scheduled user queue in step c, follow these steps:
- step c3 when detecting that the long-term scheduling metric of the active scheduling user is greater than the fixed threshold constant T1, proceed to the next step c4; otherwise, step c6 is directly performed.
- step c4 when it is detected that the difference between the long-term scheduling metric of the active scheduling user and the long-term scheduling metric of the inactive scheduling user is greater than the fixed threshold constant T2, proceed to step c5; otherwise, the step is directly performed. Step c6.
- the controller 305 creates an active scheduling user queue according to the normalized long-term scheduling metric of the active scheduling user. The smaller the normalized long-term scheduling metric of the scheduling user, the more the scheduling user is in the active scheduling user queue. before.
- the controller 305 creates an inactive scheduled user queue based on the normalized long-term scheduling metric of the inactive scheduling user, the principle of which is the same as the module 501.
- controller 305 executes module 507 if it detects that the long-term scheduling metric for the active scheduled user satisfies equation (1); otherwise, executes module 513.
- the controller 305 executes the module 509 if it detects that the long-term scheduling metric of the active scheduled user and some inactive scheduled user satisfies equation (2); otherwise, executes the module 511.
- Both Tl and ⁇ 2 in equations (1) and (2) are fixed threshold constants. Careful selection of thresholds T1 and ⁇ 2 allows the system to smoothly schedule the user's rate.
- the controller 305 inserts the inactive scheduled user in front of the corresponding active scheduled user and simultaneously clears the inactive scheduled user from the inactive scheduled user queue.
- controller 305 detects if all inactive scheduled users have been traversed, and if so, executes module 513, and if not, repeats the flow of modules 507-511.
- controller 305 detects if all active scheduled users have been traversed, and if so, executes module 515, otherwise, the flow of modules 503-513 is repeated.
- the controller 305 merges the active scheduled user queue with the inactive scheduled user queue (the active scheduled user queue is first) as the scheduled user queue, ending the process of creating the scheduled user queue.
- the method of creating the scheduling user queue is different due to different system implementations. It should be different. For example, when the impact of the signaling overhead of the data traffic channel established by the system on the forward link utilization is negligible, the controller can only create a scheduling user queue according to the normalized long-term scheduling metric, and schedule the user's return. The smaller the long-term scheduling metric is, the higher the position of the scheduling user in the scheduling user queue. These methods are all in the hair Within the scope of the inclusion.
- the target rate may be the request rate of the latest packet call arrival, or the maximum value of the latest scheduled scheduling rate of the user or the average of the latest scheduled scheduling rate of the scheduling user.
- the controller 305 updates the short-term scheduling metric of the scheduled user.
- the short-term scheduling metric is defined as shown in equation (3): represents the instantaneous rate obtained by the scheduling user; R represents the target rate of the scheduling user; "represents the weighting factor corresponding to the scheduling user.
- the weighting factor" and the instantaneous rate obtained by the scheduling user The resources consumed are all related. For example, for a forward link power limited CDMA cellular system, it is assumed that the instantaneous rate obtained by the scheduling user is that the nominal power consumed by the base station 101 to support the rate is 1 ⁇ r) .
- the power actually consumed by the base station 101 to support the rate is p ( ⁇ , then the weighting factor can be obtained by the equation (4), where is the control factor, reflecting the degree to which the base station 101 tends to schedule the user with a better wireless channel environment.
- the system resources are tight, the wireless channel environment is not good due to excessive conference conditions. The user can't get the rate for a long time. Therefore, when selecting the factor, the system engineer should balance the following two aspects:
- the controller 305 updates the long-term scheduling metric of the scheduled user.
- the long-term scheduling metric reflects the degree of satisfaction of the scheduling user to the resource allocation in multiple scheduling times.
- the short-term scheduling metric of the scheduling user in the nth scheduling is ( n ), and the user is scheduled for long-term scheduling within n schedulings.
- the measure &r (n) is:
- the controller 305 updates the normalized long-term scheduling metric of the scheduled user.
- the normalized long-term scheduling metric reflects the average satisfaction of the scheduling users to the resource allocation in multiple scheduling periods.
- the long-term scheduling metric of a scheduling user in n scheduling is r (n), then the user's normalization.
- long-term scheduling is a measure ⁇ ,
- the base station 101B shall be randomly assigned to mobile station 107A - an initial normalized long-term scheduling metric value that is between the maximum normalized long-term scheduling metric value and the minimum normalized long-term scheduling metric within the system.
- the target rate reflects the expected rate of the user.
- the target rate may have different reflection forms due to different system implementations. For example, it may schedule the request rate of the user's last packet call, or schedule the user.
- the maximum or average value of the recent scheduling rates is replaced by the number of reflections, all of which are within the scope of the present invention.
- the present invention can comprehensively consider the wireless environment in which the user is located and the available resources of the system, can effectively improve the utilization efficiency of system resources, and reduce the transmission delay of scheduling user data.
- the scheduling method and the device also take into consideration the fairness of the scheduling user.
- the smoothness of the scheduling is also considered.
- the smoothing of the scheduling on the one hand, the number of times the data traffic channel is established and released can be reduced, usually, the establishment of the traffic channel and The release requires more signaling overhead, and the reduction of the number of times the service channel is established and released means that the resource utilization rate is improved.
- the user's satisfaction with the system can be guaranteed to a certain extent.
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- Computer Networks & Wireless Communication (AREA)
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Description
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Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2002/000809 WO2004057882A1 (en) | 2002-11-13 | 2002-11-13 | Forward-link rate scheduling method and scheduler |
| AU2002349425A AU2002349425A1 (en) | 2002-11-13 | 2002-11-13 | Forward-link rate scheduling method and scheduler |
| CNB028297199A CN100531468C (zh) | 2002-11-13 | 2002-11-13 | 前向链路速率调度方法和调度器 |
| SE0501076A SE527220C2 (sv) | 2002-11-13 | 2005-05-12 | Nedlänkshastighetsscheduleringsmetod och scheduleringsanordning |
| NO20052861A NO329498B1 (no) | 2002-11-13 | 2005-06-13 | Fremgangsmate for fordeling av nedlinkshastighet og fordelingsanordning |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2002/000809 WO2004057882A1 (en) | 2002-11-13 | 2002-11-13 | Forward-link rate scheduling method and scheduler |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2004057882A1 true WO2004057882A1 (en) | 2004-07-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/CN2002/000809 Ceased WO2004057882A1 (en) | 2002-11-13 | 2002-11-13 | Forward-link rate scheduling method and scheduler |
Country Status (5)
| Country | Link |
|---|---|
| CN (1) | CN100531468C (zh) |
| AU (1) | AU2002349425A1 (zh) |
| NO (1) | NO329498B1 (zh) |
| SE (1) | SE527220C2 (zh) |
| WO (1) | WO2004057882A1 (zh) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101189833B (zh) * | 2005-06-16 | 2013-08-07 | 诺基亚公司 | 用于调度数据传输的方法、装置和设备 |
| US10218639B2 (en) | 2014-03-14 | 2019-02-26 | Microsoft Technology Licensing, Llc | Computing long-term schedules for data transfers over a wide area network |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100385863C (zh) * | 2005-12-29 | 2008-04-30 | 华为技术有限公司 | 一种媒体资源分配方法 |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1223059A (zh) * | 1997-02-11 | 1999-07-14 | 夸尔柯姆股份有限公司 | 前向链路速率调度的方法和装置 |
| WO2001071926A2 (en) * | 2000-03-17 | 2001-09-27 | Qualcomm Incorporated | Forward-link scheduling in a wireless communication system |
| WO2002039760A2 (en) * | 2000-11-07 | 2002-05-16 | Nokia Corporation | System for uplink scheduling of packet data traffic in wireless system |
| US20020071446A1 (en) * | 2000-12-07 | 2002-06-13 | Farid Khafizov | 09521398Method and apparatus for scheduling forward data link data transmission in CDMA/HDR networks |
-
2002
- 2002-11-13 WO PCT/CN2002/000809 patent/WO2004057882A1/zh not_active Ceased
- 2002-11-13 CN CNB028297199A patent/CN100531468C/zh not_active Expired - Fee Related
- 2002-11-13 AU AU2002349425A patent/AU2002349425A1/en not_active Abandoned
-
2005
- 2005-05-12 SE SE0501076A patent/SE527220C2/sv unknown
- 2005-06-13 NO NO20052861A patent/NO329498B1/no not_active IP Right Cessation
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1223059A (zh) * | 1997-02-11 | 1999-07-14 | 夸尔柯姆股份有限公司 | 前向链路速率调度的方法和装置 |
| WO2001071926A2 (en) * | 2000-03-17 | 2001-09-27 | Qualcomm Incorporated | Forward-link scheduling in a wireless communication system |
| WO2002039760A2 (en) * | 2000-11-07 | 2002-05-16 | Nokia Corporation | System for uplink scheduling of packet data traffic in wireless system |
| US20020071446A1 (en) * | 2000-12-07 | 2002-06-13 | Farid Khafizov | 09521398Method and apparatus for scheduling forward data link data transmission in CDMA/HDR networks |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101189833B (zh) * | 2005-06-16 | 2013-08-07 | 诺基亚公司 | 用于调度数据传输的方法、装置和设备 |
| US10218639B2 (en) | 2014-03-14 | 2019-02-26 | Microsoft Technology Licensing, Llc | Computing long-term schedules for data transfers over a wide area network |
Also Published As
| Publication number | Publication date |
|---|---|
| SE527220E (sv) | 2006-01-24 |
| SE527220C2 (sv) | 2006-01-24 |
| AU2002349425A1 (en) | 2004-07-14 |
| SE0501076L (sv) | 2005-06-01 |
| CN1685747A (zh) | 2005-10-19 |
| CN100531468C (zh) | 2009-08-19 |
| NO329498B1 (no) | 2010-11-01 |
| NO20052861D0 (no) | 2005-06-13 |
| NO20052861L (no) | 2005-08-15 |
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