WO2005079098A1 - スケジューリング装置およびスケジューリング方法 - Google Patents
スケジューリング装置およびスケジューリング方法 Download PDFInfo
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- WO2005079098A1 WO2005079098A1 PCT/JP2005/000927 JP2005000927W WO2005079098A1 WO 2005079098 A1 WO2005079098 A1 WO 2005079098A1 JP 2005000927 W JP2005000927 W JP 2005000927W WO 2005079098 A1 WO2005079098 A1 WO 2005079098A1
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- transmission
- scheduling
- power resource
- transmission scheme
- received power
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
- H04W52/04—Transmission power control [TPC]
- H04W52/30—Transmission power control [TPC] using constraints in the total amount of available transmission power
- H04W52/34—TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading
- H04W52/346—TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading distributing total power among users or channels
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
- H04W52/04—Transmission power control [TPC]
- H04W52/06—TPC algorithms
- H04W52/14—Separate analysis of uplink or downlink
- H04W52/146—Uplink power control
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/12—Wireless traffic scheduling
Definitions
- the present invention relates to a scheduling device and a scheduling method, and more particularly, to a scheduling device and a scheduling method for uplink data transmission in a wireless communication system.
- a general configuration of a WCDMA wireless communication system includes a wireless network controller (RNC: Radio Network Controller), a base station apparatus (BS: Base Station), and a mobile station apparatus (BS). MS: Mobile Station).
- RNC Radio Network Controller
- BS Base Station
- MS Mobile Station
- RNC Radio Network Controller
- management of received power resources and the like in the uplink is generally performed by the RNC, which is a higher-level device of the BS.
- the received power at the base station in consideration of thermal noise and interference with other cells is set to a predetermined value. It is necessary to allocate the received power resources to each MS so that it falls within the target value of, that is, assign the transmission rate (or its upper limit) to each MS. To achieve this, it is conceivable to appropriately perform scheduling for uplink data transmission.
- time and rate scheduling resources are allocated by allocating relatively large received power resources to a relatively small number of MSs (MS-A in Figure 3A) (ie, allocating the transmission rate or its upper limit). Allow MS transmission.
- MS-A in Figure 3A
- the MS permitted to transmit performs uplink data transmission within the range of the transmission rate determined at the time of scheduling, and at the transmission timing determined as needed at the time of scheduling. Therefore, time and rate scheduling is a transmission method suitable for high-speed data transmission among the above three transmission methods.
- the transmission rate request from the MS and the transmission rate permission from the BS are both performed using a signal of about 112 bits indicating, for example, up (UP), down (DOWN), or keep (KEEP). . That is, the allocation of the received power resources to the MS is gradually changed. Therefore, rate scheduling is suitable for medium to low speed data transmission among the above three transmission methods.
- MS In autonomous transmission, MS (MS-A, MS-B, and MS-C in Fig. 3C) can transmit if the transmission rate is less than a predetermined transmission rate without BS permission. .
- a low transmission rate is generally used. Therefore, autonomous transmission is suitable for low-delay data transmission at a low transmission rate among the above three transmission methods.
- Non-Patent Document 1 proposes uplink data transmission based on a combination of time and rate scheduling and autonomous transmission.
- Non-Patent Document 2 does not describe in detail the combination of time-and-rate scheduling (called time scheduling in this document) and rate scheduling, but it is clear that the combination may be possible. Have been.
- Non-patented Ai ffl ⁇ l eference Node-B scheduler for EUL, wualcomm Europe, 3rd eneration Partnership Projects, Rl-031246, November 2003
- Non-Patent Document 2 "Text Proposal: Node B Controlled Scheduling", Ericsson, 3rd ueneration Partnership Projects, Rl-031120, October 2003
- the present invention has been made in view of the power, and an object of the present invention is to provide a scheduling apparatus and a scheduling method capable of improving user throughput and system throughput in a wireless communication system.
- the scheduling device of the present invention allocates the received power resource set by the higher-level device to a plurality of transmission methods used in uplink data transmission, and allocates the received power resource to the plurality of transmission methods.
- the base station apparatus of the present invention includes: a determination unit that determines a transmission scheme to be used by the mobile station apparatus based on information reported from the mobile station apparatus; Allocating means for allocating the reception power resource set by the higher-level device to a plurality of transmission schemes used in uplink data transmission based on the determination result of the determination means; and receiving power allocated to the plurality of transmission schemes.
- a configuration including scheduling means for executing scheduling of uplink data transmission according to resources and signaling means for signaling a result of the determination by the determining means to the mobile station apparatus is adopted.
- a mobile station device of the present invention is a mobile station device that performs uplink data transmission to a base station device, and a reporting unit that reports information about the own device to the base station device. And a transmission means for performing uplink data transmission using the detected transmission scheme, based on the information transmitted from the base station apparatus. .
- the scheduling method includes: an allocation step of allocating a reception power resource set by a higher-level device to a plurality of transmission schemes used in uplink data transmission; and a reception allocated to the plurality of transmission schemes.
- user throughput and system throughput in a wireless communication system can be improved. Also, the amount of signaling between the higher-level device and the base station device can be significantly reduced.
- FIG. 1 is a block diagram showing a general configuration of a wireless communication system
- FIG. 2 is a diagram for explaining an example of distribution of received power resources
- FIG. 3A Diagram for explaining an example of a transmission method
- FIG. 3B Diagram for explaining another example of the transmission method
- FIG. 3C Diagram for explaining still another example of the transmission method
- FIG. 4 is a block diagram showing a configuration of a wireless communication system having a base station apparatus according to Embodiment 1 of the present invention.
- FIG. 5 is a flowchart for explaining an operation of a scheduling section in the base station apparatus according to Embodiment 1 of the present invention.
- Garden 6 A diagram schematically showing a process of distributing the received power resource in Embodiment 1.
- FIG. 7 A diagram showing a temporal variation state of the mobile station device
- FIG. 9 is a block diagram showing a configuration of a wireless communication system having a base station apparatus according to Embodiment 2 of the present invention.
- FIG. 12A is a diagram schematically showing a process of distributing the received power resource in Embodiment 2.
- FIG. 12A] is a diagram showing the variation of the received power resource allocation to each mobile station device in Embodiment 2.
- FIG. 13 shows a change in the amount of data in each mobile station device in Embodiment 2.
- FIG. 13 is a diagram showing a configuration of a wireless communication system having a base station device according to Embodiment 3 of the present invention.
- FIG. 14A A diagram showing the variation of the allocation of the reception power resource to each mobile station device in the third embodiment.
- FIG. 15 shows a change in data amount in each mobile station device in Embodiment 3.
- FIG. 15 Block diagram showing a configuration of a wireless communication system having a base station device according to Embodiment 4 of the present invention
- Garden 16B A diagram showing a change in the amount of data in each mobile station device in Embodiment 4.
- Garden 17A A diagram showing switching of a transmission method in each mobile station device according to the transmission power resource in Embodiment 4.
- FIG. 19 shows a configuration of a wireless communication system having a base station apparatus according to Embodiment 5 of the present invention. Block diagram shown
- FIG. 20 is a diagram showing a change in received power resource allocation to each mobile station device according to Embodiment 5.
- FIG. 4 is a block diagram showing a configuration of a wireless communication system having a BS according to Embodiment 1 of the present invention.
- the wireless communication system of the present embodiment it is assumed that two transmission schemes are used for uplink data transmission.
- these two transmission schemes are the first transmission scheme S time and rate scheduling and the second transmission scheme is the rate scheduling.
- the radio communication system shown in FIG. 4 has RNC 10, BS 20 and N MSs 30-1, 30-2,..., 30-N.
- the BS 20 has a transmitting unit 21, a scheduling unit 22, and a receiving unit 23.
- Transmitting section 21 performs predetermined transmission processing on DL (DownLink) data 153 from RNC 10 according to first transmission scheme scheduling result information 163 and second transmission scheme scheduling result information 164 from scheduling section 22. Apply. Then, the radio signal including the DL data 172-1-172_N, the first transmission scheme assignment information 170-1-1170-N and the second transmission scheme assignment information 171-1-17-N is transmitted to the MS 30-1-30-N. To send.
- DL (DownLink) data 153 from RNC 10 according to first transmission scheme scheduling result information 163 and second transmission scheme scheduling result information 164 from scheduling section 22. Apply. Then, the radio signal including the DL data 172-1-172_N, the first transmission scheme assignment information 170-1-1170-N and the second transmission scheme assignment information 171-1-17-N is transmitted to the MS 30-1-30-N. To send.
- first transmission scheme assignment information 170 -k is transmitted only to MS 30 -k permitted to transmit data in the first transmission scheme, and data is transmitted in the second transmission scheme. It is assumed that the second transmission scheme assignment information 171-h is transmitted only to the MS 30-h permitted to transmit.
- Receiving section 23 includes UL (UpLink) data 173-1-173_N of the first transmission method and UL data 174 of the second transmission method included in the radio signal transmitted from MS 30-1-30 -N. Specified receiving processing is performed on -1- 17 4-N and reported value 175-1-175-N.
- UL UpLink
- a report value 162 obtained as a reception processing result for the report value 175-1—175-N is output to the scheduling unit ⁇ , and the UL data 173-1-173_N, 174-1-174-N
- the reported values 175-11-175-N contain information within each MS30-1-30-N, such as, for example, available transmit power resources or the amount of data in the transmit buffer or a combination thereof, generally In other words, information related to the communication status of uplink data transmission is included
- the scheduling section 22 includes a management section 100, a first transmission scheme scheduling section 110, and a second transmission scheme scheduling section 120.
- the management unit 100 which is a main feature of the present invention, allocates the reception power resource 150 set by the RNC 10 to the first transmission scheme reception power resource 160 and the second transmission scheme reception power resource 161. More specifically, the management unit 100 includes a setting unit 101, and the setting unit 101 is configured to transmit the received power resource 150 and the second transmission scheme scheduling unit 120 based on the past (previous in the present embodiment) second transmission scheme. Based on the scheduling result information 164, the first transmission scheme reception power resource 160 for the current scheduling is set and output to the first transmission scheme scheduling section 110. For example, the second transmission scheme reception power resource 161 is set to the value of the reception power resource used as a result of the previous scheduling by the second transmission scheme scheduling section 120. Then, a value obtained by subtracting the second transmission scheme reception power resource 161 from the reception power resource 150 is set as the first transmission scheme reception power resource 160, and this is output to the first transmission scheme scheduling section 110.
- the second transmission scheme reception power resource 161 is set based on the past second transmission scheme scheduling result information 164, and then the second transmission scheme reception power resource 161 is set from the reception power resource 150. Is set as the first transmission scheme received power resource 160, the received power resource can be set without complicating the configuration. Further, since the second transmission scheme received power resource 161 is set based on the past second transmission scheme scheduling result information 164, the set second transmission scheme received power resource 161 and the actually used reception power resource The possibility that a large error will occur between them can be reduced.
- setting section 101 of management section 100 transmits second transmission scheme received power resource 161 to second transmission scheme reception power resource 161.
- the maximum value that can be used by the transmission method (that is, the received power resource required by the second transmission method when all MSs in the second transmission method are instructed to increase the transmission rate) should be set. May be. In this case, reception power resources can be allocated with priority given to the second transmission scheme.
- the second transmission scheme received power resource 161 is set to the minimum value that can be used by the second transmission scheme.
- reception power resources can be allocated with priority given to the first transmission scheme.
- the second transmission scheme reception power resource 161 may be allocated to the first transmission scheme reception power resource 160 such that the second transmission scheme reception power resource 161 falls within the range of the minimum value and the maximum value that the second transmission scheme can use. . In this case, in the data transmission based on the second transmission scheme, it is possible to reduce the possibility that the reception power resource cannot be used up or run short.
- First transmission scheme scheduling section 110 performs scheduling for the first transmission scheme in uplink data transmission based on first transmission scheme terminal information 151, first transmission scheme received power resource 160, and report value 162.
- the receiving power resource is allocated to each MS 30-1-1 30-N, that is, the transmission rate is allocated.
- the first transmission scheme scheduling result information 163 indicating the result of the scheduling is output to the transmission unit 21.
- the first transmission method terminal information 151 is information (MS number, number of MSs, etc.) regarding the MS that is the target of the first transmission method. In the present embodiment, for example, the number of MSs is increased or decreased. Is assumed to be managed by RNC10.
- the first transmission scheme scheduling result information 163 indicates an MS that permits data transmission in the first transmission scheme, a transmission rate (or transmission power) and transmission timing in data transmission, and the like.
- Second transmission scheme scheduling section 120 performs scheduling for the second transmission scheme in uplink data transmission based on second transmission scheme terminal information 152, second transmission scheme received power resource 161 and report value 162. Then, receive power resources are allocated to each MS 30-1-30-N, that is, a transmission rate is allocated. Then, second transmission scheme scheduling result information 164 indicating the result of the scheduling is output to transmitting section 21.
- the second transmission scheme terminal information 152 includes information on the MS that is the target of the second transmission scheme. In this embodiment, it is assumed that, for example, an increase or decrease in the number of MSs is managed by the RNC 10.
- the second transmission scheme scheduling result information 164 indicates an MS that permits data transmission in the second transmission scheme, a transmission rate and a transmission timing in data transmission, and the like.
- the MS 30-1 has a reception unit 31 and a transmission unit 32.
- the MS30-230-N has the same internal configuration as the MS30-1. Therefore, for the sake of simplicity, a detailed description of the internal configuration and operation of the MS30_2 30-N is omitted, and only the MS30-1 will be described.
- Reception section 31 performs a predetermined reception process on a radio signal including one of first transmission scheme allocation information 170-1 and second transmission scheme allocation information 171-1 and DL data 172-1. Is applied. Then, the DL 180-1 obtained as a result of the reception processing for the DL data 172-1 is output. Also, the first transmission scheme assignment information 1811 obtained as a result of the reception processing for the first transmission scheme assignment information 170-1 or the second transmission scheme assignment information 171-1 and the second transmission scheme assignment information 181-2 are obtained. 1 is output to the transmission unit 32.
- the transmission unit 32 performs a predetermined transmission process on the UL data 183-1 and the report value 184-1 to be transmitted.
- the first transmission scheme allocation information 181-1 is input, uplink data transmission based on the first transmission scheme is performed, that is, a radio signal including UL data 173-1 is transmitted to the reception unit 23 of the BS 20.
- the second transmission scheme assignment information 182-1 is input, uplink data transmission based on the second transmission scheme is performed, that is, a radio signal including UL data 174-1 is transmitted to the reception unit 23 of the BS 20.
- the transmission processing result for report value 184-1 is set as report value 175-1 and a radio signal including the report value is transmitted to receiving section 23.
- FIG. 5 is a flowchart for explaining the operation of the scheduling unit 22, and FIG. 6 is a diagram schematically showing a process of allocating the reception power resource 150.
- step ST1000 setting section 101 sets second transmission scheme received power resource (RS_2) 161 based on previous second transmission scheme scheduling result information 164. Then, the second transmission scheme reception power resource (RS_2) 161 is secured in the reception power resource (RS) 150 set by the RNC 10. Then, in step ST1100, the first transmission scheme reception power resource (RS_1) 160 is calculated by subtracting the second transmission scheme reception power resource (RS_2) 161 from the reception power resource (RS) 150. Then, the first transmission scheme scheduling section 110 performs scheduling of the first transmission scheme (ST1200), and the second transmission scheme scheduling section 120 performs scheduling of the second transmission scheme (ST1300).
- first transmission scheme scheduling in step ST1200 may be performed any time after the first transmission scheme received power resource (RS_1) 160 is determined.
- second transmission scheme scheduling in step ST1300 may be performed any time after the second transmission scheme received power resource (RS_2) 161 is determined.
- the number of MSs targeted for the first transmission scheme does not change after time TO, and the number of MSs targeted for the second transmission scheme fluctuates over time. More specifically, as shown in FIG. 7, the number of MSs at time T1 is 1, the number of MSs at time T1 is 4 at time T1, and the number of MSs at time T2 is 2 as shown in FIG. It is assumed that Further, in the following description, attention is particularly paid to the period of time T1 temporary IJT2. During this period, the number of target MSs in the first transmission scheme is two, that is, MS-A and MS-B. Further, the number of target MSs in the second transmission scheme is four, that is, MS_C, MS_D, MS-E, and MS-F.
- FIG. 8 is a diagram showing a change in allocation of the received power resource to each MS during a period from time T1 to time T2.
- the period from time T1 to time T2 includes a scheduling period Tsch (l) Tsch (6).
- the sum of the received power resources allocated to MS_C-MS_F as the scheduling result of scheduling period Tsch (3) ie, the received power resources of the second transmission scheme 161 in scheduling period Tsch (3))
- the sum of the received power resources allocated to the MS—C MS—F as a scheduling result of the scheduling period Tsch (4) is the second transmission scheme received power resource 161 for the scheduling period Tsch (5). It becomes.
- the received power resource actually allocated to MS—C—MS—F is only A more than the second transmission scheme received power resource 161. It is getting smaller. Therefore, in the scheduling period Tsch (5), the second transmission scheme received power resource 161 is smaller than in the scheduling period Tsch (4). As a result, the reception power resource 160 of the first transmission scheme in the scheduling period Tsch (5) increases.
- the reception power resource allocation according to the present embodiment can follow the fluctuation of the allocation of the reception power resource for each scheduling period.
- the reception power resource allocation can also be performed by the RNC 10.
- the RNC 10 performs reception power resource allocation according to only the increase / decrease of the number of MSs, it cannot be said that the allocation of the reception power resource 150 is flexibly controlled. This is because the amount of received power resources actually allocated to each MS30-1-30-N is a force that depends on the communication status with each MS30-1-30-N.
- the RNC 10 it is not easy for the RNC 10 to immediately grasp the report value 162 including information related to the communication status or the scheduling result of the scheduling unit 22 performed based on the report value 162. Les ,.
- the scheduling period is very short, on the order of a few ms and a few tens of ms, while the signaling between the RNC and the BS has a delay of several hundred ms.
- the scheduling since the scheduling is performed by the scheduling unit 22 of the BS 20, the allocation of the received power resources can be reliably synchronized with the scheduling cycle, and flexible allocation control can be performed.
- reception power resource 150 set by RNC 10 is allocated to a plurality of transmission schemes while BS 20 considers report value 162, so that multiple transmission schemes are used. It is possible to control the distribution of the received power resources among the nodes at high speed and flexibly, to improve the utilization efficiency of the received power resources 150, and to improve the user throughput and the system throughput in the radio communication system. Power S can.
- FIG. 9 is a block diagram showing a configuration of a wireless communication system having BS 20 according to Embodiment 2 of the present invention.
- the wireless communication system according to the present embodiment it is assumed that two transmission schemes are used for uplink data transmission, as in the above embodiment.
- the first transmission method is time-and-rate scheduling and the second transmission method is rate scheduling.
- the wireless communication system described in the present embodiment has the same basic configuration as the wireless communication system described in Embodiment 1, and the same or corresponding components are denoted by the same reference characters. The detailed description is omitted.
- Scheduling section 22 of the present embodiment has management section 200 instead of management section 100 described in the first embodiment.
- the management unit 200 includes an addition unit 201 in addition to the setting unit 101. Further, the scheduling unit 22 further includes a monitor unit 202.
- a main feature of the present embodiment is that when a surplus occurs in the received power resource in the scheduling of the first transmission scheme, the surplus is added to the received power resource of the second transmission scheme.
- the second transmission scheme received power resource 161 set by the setting unit 101 is sent to the adding unit 201.
- Monitor section 202 monitors the occurrence of excess received power resources due to the scheduling of first transmission scheme scheduling section 110. When a surplus occurs, the surplus amount is calculated, and at least a part of the surplus amount (hereinafter referred to as “first transmission method surplus received power resource 260”) is added. Output to section 201.
- Adder 201 calculates the sum of second transmission scheme received power resource 161 and first transmission scheme surplus received power resource 260, and divides second transmission scheme received power resource 261 that is the calculation result into second transmission scheme scheduling. Output to section 120.
- FIG. 10 is a flowchart for explaining the operation of the scheduling unit 22, and FIG. 11 is a diagram schematically showing a process of allocating the reception power resource 150.
- step ST1210 monitor 202 checks the reception power resource (RS_1 ′) used in the first transmission scheme scheduling in step ST1200. ) Is subtracted from the first transmission scheme received power resource (RS_1) 160. Thereby, the first transmission method surplus received power resource (RS ⁇ remain) 260 is calculated. Then, in step ST1220, the first transmission scheme surplus received power resource (RS remaining) 260 is calorie-calculated to the second transmission scheme received power resource (RS_2) 161. In this way, the second transmission scheme received power resource (RS_2) 261 is calculated. Then, the process proceeds to Step ST1300 described in the first embodiment.
- the first transmission scheme scheduling in step ST1200 may be performed any time after the first transmission scheme received power resource (RS_1) 160 is determined.
- FIG. 12A is a diagram showing a change in received power resource allocation to each MS
- FIG. 12B is a diagram showing a change in data amount in each MS.
- attention is paid to the period between time T1 and time T2. That is, the target MSs of the first transmission scheme are MS-A and MS-B, and the target MSs of the second transmission scheme are MS_C, MS_D, MS-E, and MS-F.
- the surplus of first transmission scheme received power resource 160 generated as a result of scheduling Since one transmission scheme surplus reception power resource 260 is added to the second transmission scheme reception power resource 161, the surplus of the reception power resource in one transmission scheme can be redistributed to the other transmission scheme, and the reception power resource The use efficiency of 150 can be further improved.
- FIG. 13 is a block diagram showing a configuration of a wireless communication system having BS 20 according to Embodiment 3 of the present invention.
- the wireless communication system according to the present embodiment it is assumed that two transmission schemes are used for uplink data transmission, as in the above embodiment.
- the first transmission method is time-and-rate scheduling and the second transmission method is rate scheduling.
- the wireless communication system described in the present embodiment has a basic configuration similar to that of the wireless communication system described in Embodiment 2, and the same or corresponding components have the same basic configuration. The same reference numeral is attached, and the detailed description is omitted.
- Scheduling section 22 of the present embodiment has management section 300 instead of management section 200 described in the second embodiment.
- the management unit 300 includes an addition unit 201, a setting unit 301 instead of the setting unit 101, and further includes a determination unit 302.
- the main feature of the present embodiment is that among the report values from MS 30-1 30-N to BS 20, reception power resource allocation is performed in consideration of, in particular, fluctuations in the amount of data.
- the data amount information may be an indirect value such as a requested transmission rate based on the data amount in the transmission buffer of the MS, and further, an absolute value, a relative value, and a difference value (eg, UP / DOWN / K EEP etc.).
- determination section 302 determines whether first transmission scheme reception power resource 160 or second transmission scheme reception power resource 161 is present. Judge whether to increase or decrease.
- the data amount of the MS that is the target of the first transmission scheme is referred to. If, for example, a remarkable decrease or increase in the data amount of the first transmission method is observed or expected, the reception of the first transmission method is completed before the data transmission based on the first transmission method is completed.
- the increase / decrease of the power resource 160 is determined, and this is instructed to the setting unit 301.
- the determining unit 302 may instruct not only the increase / decrease of the first transmission method received power resource 160 but also the increase / decrease rate and the increase / decrease rate.
- setting section 301 allocates received power resources 150 according to the instruction. For example, when the determination unit 302 instructs to reduce the first transmission scheme reception power resource 160, an additional amount is added to the second transmission scheme reception power resource 161 at the stage of securing the second transmission scheme reception power resource. .
- Other operations performed by the setting unit 301 are the same as those of the setting unit 101.
- FIG. 14A is a diagram showing a change in received power resource allocation to each MS
- FIG. 14B is a diagram showing a change in data amount in each MS.
- attention is paid to the period between time T1 and time T2. That is, the target MSs of the first transmission scheme are MS-A and MS-B, and the target MSs of the second transmission scheme are MS-A _C, MS_D, MS-E and MS_F.
- the first transmission scheme received power resource 160 is reduced in each of the scheduling periods Tsch (2), Tsch (4), and Tsch (5).
- the received power resource 160 of the first transmission scheme can be reduced, and the second transmission scheme can be reduced.
- the system received power resource 261 can be increased. 14A and 14B, the case where the first transmission scheme received power resource 160 is decreased with time has been described. Similarly, the case where the first transmission scheme received power resource 160 is increased with time is also described. It is feasible.
- reception power resource allocation is performed particularly in consideration of data amount fluctuations. Therefore, as long as there is a sufficient amount of transmission data, the probability that the reception power resource 150 can be used up all the time can be greatly improved. Further, the transmission rate of the second transmission method can be increased while minimizing the extension of the data transmission period of the first transmission method.
- FIG. 15 is a block diagram showing a configuration of a wireless communication system having BS 20 according to Embodiment 4 of the present invention.
- the wireless communication system according to the present embodiment it is assumed that two transmission schemes are used for uplink data transmission, as in the above embodiment.
- the first transmission method is time-and-rate scheduling
- the second transmission method is rate scheduling.
- the wireless communication system described in the present embodiment has the same basic configuration as the wireless communication system described in Embodiment 3, and the same or corresponding components are denoted by the same reference characters. The detailed description is omitted.
- the scheduling section 22 of the present embodiment has a management section 400 instead of the management section 300 described in the third embodiment.
- the management unit 400 includes a judgment / selection unit 401 instead of the judgment unit 302.
- the wireless communication system of the present embodiment uses MS43 instead of MS30-1 30-N. It has 0-1—430-N. The details of the internal structure of the MS430-1 430-N will be described later in detail.
- the main feature of the present embodiment is that the BS 20 also switches between a plurality of transmission schemes that can be performed only by allocating received power resources to the plurality of transmission schemes.
- the determination / selection unit 401 determines the first transmission method terminal information 460 and the second transmission method terminal information 461 based on the report value 162. In other words, the transmission method to be used in each of the MS430-1 and 430-N is selected from the first transmission method and the second transmission method. If the two transmission methods can be used together, determine whether each transmission method can be used (on-Z off) for each MS.
- the first transmission method terminal information 151 and the second transmission method terminal information 152 were transmitted from the RNC 10, whereas in the present embodiment, the first transmission method terminal information
- the information 460 and the second transmission method terminal information 461 are determined inside the BS 20.
- the determined first transmission scheme terminal information 460 and second transmission scheme terminal information 461 are output to first transmission scheme scheduling section 110 and second transmission scheme scheduling section 120, respectively.
- Other operations performed by the determination / selection unit 401 are the same as those of the determination unit 302. That is, it is determined whether to increase or decrease the first transmission scheme reception power resource 160 or the second transmission scheme reception power resource 161. Furthermore, the range of increase or decrease and the rate of increase / decrease may be specified.
- the switching operation of the transmission scheme by BS 20 having the above configuration will be described with reference to two examples.
- One is a switching operation according to the data amount of MS430-1-430-N
- the other is a switching operation according to the transmission power resource of MS430-11-430-N.
- attention is paid to the period between time T1 and time T2.
- the first transmission scheme is time and rate scheduling and signaling on the downlink is multi-bit
- the number of MSs for which the first transmission scheme is simultaneously permitted is limited to two. Assume that
- FIG. 16A is a diagram illustrating transmission method switching according to the data amount in each MS
- FIG. 16B is a diagram illustrating fluctuations in the data amount in each MS.
- This switching may be performed based on a predetermined priority.
- the priorities used include, for example, report values such as the data amount and transmission power resources of the MS, data dwell time in the MS, past user throughput, and delay time.
- the received power resource 150 can be used effectively, and data transmission can be performed after switching to the first transmission method, that is, the transmission method with a high transmission rate in order from the MS with the highest priority. Become.
- FIG. 17A is a diagram illustrating transmission method switching according to transmission power resources in each MS
- FIG. 17B is a diagram illustrating fluctuations in transmission power resources in each MS.
- the received power resources of each MS of the second transmission scheme are the same.
- the transmission power resources of MS_A and MS_B are the upper two, so that MS-A and MS-B perform data transmission in the first transmission scheme.
- the top two MSs are replaced by MS—A and MS—E.
- the MSs are replaced by MS—E and MS—C, and the scheduling period Tsch ( In 5), MS-B and MS-E are replaced. Therefore, in each of these periods, the MSs for which the first transmission scheme is permitted are also switched. This means that a large transmission power resource means that reception is possible even if data transmission is performed with low transmission power, meaning that the conditions of the propagation path are good. .
- the permitted MS since the first transmission scheme is preferentially granted to an MS having a good propagation path condition, the permitted MS performs data transmission at a low transmission power and a high transmission rate. It becomes possible. In addition, since low transmission power is sufficient, it is possible to reduce interference to other BSs, and it is possible to further improve system throughput. In addition, by exchanging MSs that permit the first transmission scheme, MSs with good channel conditions can perform data transmission at high transmission rates, resulting in a multi-user diversity effect and increased system throughput. Can be done.
- MS430 Any MS among MS430-1-430-N is called MS430.
- FIG. 18 is a block diagram showing a configuration of MS430.
- the MS 430 includes a receiving unit 431, a transmitting unit 432, and a transmission method switching unit 433.
- Receiving section 431 includes first transmission scheme assignment information receiving section 441, second transmission scheme assignment information receiving section 442, and DL data receiving section 443.
- the transmission section 432 has a transmission buffer 451, a first transmission scheme transmission section 452, a second transmission scheme transmission section 453, and a report value transmission section 454.
- First transmission scheme assignment information receiving section 441 demodulates first transmission scheme assignment information 170. Then, it determines whether or not signaling to its own device has been received. If it has been received, it extracts first transmission method allocation information 181 and outputs it to transmission method switching section 433 and transmission section 432.
- Second transmission scheme assignment information receiving section 442 demodulates second transmission scheme assignment information 171. Then, a determination is made as to whether or not signaling to the own device has been received. If the signaling has been received, second transmission method allocation information 182 is extracted and output to transmission method switching section 433 and transmission section 432.
- DL data receiving section 443 demodulates DL data 172 and outputs DL data 180.
- the transmission method switching unit 433 determines that data transmission of the first transmission method has been permitted to the transmission buffer 451 and that the permitted transmission has been performed. Report the rate or its maximum. Also, when the second transmission method allocation information 182 is input, it is determined that the data transmission of the second transmission method is And the allowed transmission rate.
- the transmission buffer 451 outputs the UL data 183 to the first transmission method transmission unit 452 or the second transmission method transmission unit 453 according to the presence or absence of the notification from the transmission method switching unit 433.
- First transmission scheme transmission section 452 modulates UL data 183 and transmits data as UL data 173 based on the first transmission scheme.
- Second transmission scheme transmission section 453 modulates UL data 183 and transmits the data as UL data 174 based on the second transmission scheme.
- Report value transmitting section 454 modulates report value 184 and transmits it as report value 175.
- the transmission method can be switched according to the signal from the BS 20.
- the transmission scheme is switched depending on which of first transmission scheme assignment information 181 and second transmission scheme assignment information 182 has been received.
- the switching method is not limited to this. For example, whether or not the first transmission method assignment information 170 is received or whether or not the second transmission method assignment information 171 is received, that is, whether the switching is performed based on the signaling on the BS 20 side is acceptable.
- MS 430 may perform data transmission in both of the two transmission schemes when there is sufficient transmission power resources. .
- not only distribution of received power resources to a plurality of transmission schemes, but also switching between a plurality of transmission schemes is performed by BS20. It is possible to switch the transmission method so that a transmission method with a high transmission rate is applied to high MSs or MSs with good propagation path conditions, and to perform switching control at high speed in the same way as reception power resource distribution control As a result, it is possible to prioritize MSs that have strict delay requirements, and to further improve user throughput and system throughput.
- FIG. 19 is a block diagram showing a configuration of a wireless communication system having BS 20 according to Embodiment 5 of the present invention.
- the wireless communication system of the present embodiment it is assumed that two transmission schemes are used for uplink data transmission as in the above embodiment.
- an autonomous transmission is adopted as the second transmission method as an example.
- the wireless communication system described in the present embodiment has the same basic configuration as the wireless communication system described in Embodiment 3, and the same or corresponding components have the same reference characters. And a detailed description thereof will be omitted.
- the scheduling section 22 of the present embodiment has a management section 500 instead of the management section 200, and has a second transmission scheme rate control section 502 instead of the second transmission scheme scheduling section 120.
- the management unit 500 may use the first transmission method as in the determination unit 302 based on the setting unit 301, the addition unit 201, and the first transmission method terminal information 151 and the second transmission method terminal information 152.
- a main feature of the present embodiment is that reception power resource allocation is performed by BS20 in a wireless communication system that employs autonomous transmission for one of a plurality of transmission methods.
- Second transmission scheme rate control section 502 equally divides second transmission scheme reception power resource 261 by the number of MSs based on second transmission scheme terminal information 152. With this, the received power resource per MS is calculated. Further, the transmission unit 21 converts the transmission rate into the transmission rate and outputs it to the transmission unit 21 as the second transmission scheme rate information 560.
- the second transmission scheme rate information 560 is information common to one or more target MSs, it is difficult to perform different control for each MS, but the amount of signaling in the downlink is reduced. It becomes possible. If the target MSs of the second transmission method are grouped in advance, the transmission rate can be controlled for each group.
- FIG. 20 is a diagram showing a change in received power resource allocation to each MS.
- attention is paid to the period between time T1 and time T2.
- the number of target MSs in the first transmission scheme is two (MS-A and MS_B), while the number of target MSs in the second transmission scheme is not specified but is plural. .
- the surplus can be redistributed to the second transmission scheme received power resource.
- the second transmission scheme received power resource 261 is equally divided for each of the target MSs of the second transmission scheme. Is done.
- reception power resource allocation is performed by BS 20 in a wireless communication system that employs autonomous transmission for one of a plurality of transmission schemes. Since allocation control can be performed at a high speed, it is possible to give priority to an MS having a strict delay requirement, and to further improve user throughput and system throughput.
- another scheduling scheme such as power rate scheduling described as an example of time and rate scheduling as the first transmission scheme can be realized.
- Switching can be performed.
- three examples of time-and-rate scheduling, rate scheduling, and autonomous transmission have been described, but other transmission methods can be implemented as long as at least two transmission methods are combined.
- the present invention can also be implemented when the BS combines a transmission scheme that performs scheduling for E-DCH (Enhanced-Dedicated Channel) and a transmission scheme that does not perform scheduling for E-DCH in the BS. is there.
- E-DCH is a channel used in uplink enhancement.
- the channel to be scheduled need not be limited to only E-DCH.
- this method is also used when the BS combines the transmission method in which scheduling is performed for E-DCH and the transmission method in which a higher-level device (for example, RNC) controls the upper limit of the conventional DCH (Dedicated Channel) transmission rate. It is possible.
- the present invention can also be implemented when a transmission method that does not perform scheduling on H is combined with a transmission method in which the higher-level device controls the upper limit of the DCH transmission rate.
- a mode in which at least two transmission schemes are combined and referred to as one transmission scheme can be considered.
- internal transmission power resource allocation or transmission is performed.
- the present invention can be similarly implemented as long as an operation such as a method switching is included.
- the received power resource set by the higher-level device to the BS is the target value of the total received power excluding other-cell interference power and thermal noise power as shown in FIG.
- the force is described as not limited to this.
- any parameter can be used as long as it is a parameter related to the received power resource.
- Available parameters include, for example, total received power, ratio of total received power to thermal noise power, ratio of total received power to interference power, ratio of total received power to interference power + thermal noise power, channel for E-DCH
- Whichever parameter is used, that parameter is converted to a received power resource in the BS.
- the distribution of the received power resources set by the RNC which is a higher-level device of the BS, that is, the distribution to a plurality of transmission schemes used in uplink data transmission is determined by the RNC.
- the BS switches between multiple transmission schemes. This makes it possible to control the allocation and switching of the reception power resources among a plurality of transmission schemes at a high speed, improve the utilization efficiency of the reception power resources, and improve the user throughput and the wireless communication system. System throughput can be improved. In addition, the amount of signaling between the host device and the base station device can be significantly reduced.
- the scheduling device and the scheduling method of the present invention have an effect of improving the user throughput and the system throughput in a wireless communication system, and are useful for data transmission on an up line.
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US10/549,313 US20060246935A1 (en) | 2004-02-13 | 2005-01-25 | Scheduling apparatus and scheduling apparatus method |
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JP4538366B2 (ja) * | 2005-03-29 | 2010-09-08 | 株式会社エヌ・ティ・ティ・ドコモ | 伝送速度制御方法、移動局及び無線基地局 |
JP2007013489A (ja) * | 2005-06-29 | 2007-01-18 | Kyocera Corp | 通信システム、通信装置、送信電力制御方法、及びプログラム |
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