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WO2013035467A1 - Station de base et procédé de commande de communication - Google Patents

Station de base et procédé de commande de communication Download PDF

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Publication number
WO2013035467A1
WO2013035467A1 PCT/JP2012/069846 JP2012069846W WO2013035467A1 WO 2013035467 A1 WO2013035467 A1 WO 2013035467A1 JP 2012069846 W JP2012069846 W JP 2012069846W WO 2013035467 A1 WO2013035467 A1 WO 2013035467A1
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WO
WIPO (PCT)
Prior art keywords
user data
mobile station
physical channel
predetermined
downlink shared
Prior art date
Application number
PCT/JP2012/069846
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English (en)
Japanese (ja)
Inventor
義顕 大藤
尚人 大久保
耕平 清嶋
Original Assignee
株式会社エヌ・ティ・ティ・ドコモ
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Publication date
Application filed by 株式会社エヌ・ティ・ティ・ドコモ filed Critical 株式会社エヌ・ティ・ティ・ドコモ
Publication of WO2013035467A1 publication Critical patent/WO2013035467A1/fr

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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
    • H04W72/56—Allocation or scheduling criteria for wireless resources based on priority criteria
    • H04W72/566—Allocation or scheduling criteria for wireless resources based on priority criteria of the information or information source or recipient

Definitions

  • the present invention schedules user data for a plurality of mobile stations on a downlink shared physical channel, and transmits user data scheduling results to one or more mobile stations that transmit and receive the user data multiplexed on the downlink shared physical channel.
  • the present invention relates to a base station and a communication control method that notify a plurality of mobile stations via a control physical channel.
  • LTE Long Term Evolution
  • 3GPP 3rd Generation Partnership Project
  • PDSCH downlink shared physical channel
  • a mobile station (user) scheduling result (DL scheduling info) to PDSCH is notified to the mobile station using a downlink control physical channel (PDCCH) (for example, Non-Patent Document 1).
  • PDCCH downlink control physical channel
  • the number of PDCCHs that can be multiplexed is about 6 to 8 (/ subframe) on average including DL scheduling info and UL scheduling grant. That is, the number of mobile stations that can be multiplexed in each of the downlink and uplink directions is about 3 to 4 on average.
  • the above-described conventional scheduling method of the mobile station to the PDSCH has the following problems.
  • the data size per mobile station is small, there is a problem that user data for mobile stations cannot be multiplexed even though the PDSCH has room. It was.
  • scheduling of user data for a mobile station to a PDSCH in a base station is a priority determined in consideration of indexes such as service priority, QoS (Quality of Service), radio quality of each mobile station, and whether or not it is retransmission data. It is done according to the ranking.
  • indexes such as service priority, QoS (Quality of Service)
  • QoS Quality of Service
  • radio quality of each mobile station and whether or not it is retransmission data. It is done according to the ranking.
  • the priority order is determined by, for example, quantifying the priority of each index, calculating the sum after multiplying the numerical priority of each index by a weighting factor, and determining the priority based on the calculated value. Can be considered.
  • the present invention has been made in view of such a situation.
  • the downlink control physical channel An object of the present invention is to provide a base station and a communication control method that can improve the use efficiency of the downlink shared physical channel even in a situation where the number of multiplexable mobile stations is limited.
  • the first feature of the present invention is that scheduling user data for a plurality of mobile stations (mobile stations 200A and 200B) is scheduled on a downlink shared physical channel (PDSCH), and the user data multiplexed on the downlink shared physical channel is transmitted and received.
  • PSCH scheduler for scheduling such that a mobile station having a large data size in which the size of the user data or the number of radio resource blocks necessary for transmitting the user data is larger than a predetermined size threshold (TH SIZE ) is included 103), and the scheduler is a remaining downlink control physical channel resource that can be scheduled.
  • TH SIZE predetermined size threshold
  • the mobile station that is to be multiplexed with the user data is selected according to a predetermined priority, and the remaining downlink control physical channel resource or The gist is to preferentially schedule the large data size mobile station when the remaining downlink shared physical channel multiplexing number is equal to or less than the predetermined multiplexing threshold.
  • At least one mobile station that schedules user data for a plurality of mobile stations on a downlink shared physical channel and transmits and receives the user data multiplexed on the downlink shared physical channel
  • the scheduling step includes scheduling remaining downlink control physical channel resources or scheduling capable Residual downlink shared physical channel multiplexing When the number is equal to or greater than a predetermined multiplexing threshold, the step of selecting a mobile station to be multiplexed with the user data according to a predetermined priority, and the remaining downlink control physical channel resource or the remaining downlink shared physical channel multiplexing number And a step of preferentially scheduling the mobile station having the large data size when the predetermined multiple threshold
  • FIG. 1 is an overall schematic configuration diagram of a radio communication system according to an embodiment of the present invention.
  • FIG. 2 is a functional block configuration diagram of the base station 100 according to the embodiment of the present invention.
  • FIG. 3 is a diagram showing a scheduling operation flow of the base station 100 according to this embodiment according to the embodiment of the present invention.
  • FIG. 4 is a diagram showing an example of a table used when N UE_LargeData according to the embodiment of the present invention is variably controlled.
  • FIG. 1 is an overall schematic configuration diagram of a radio communication system according to the present embodiment.
  • the radio communication system according to the present embodiment employs a Long Term Evolution (LTE) scheme, and includes a core network 50, a base station 100 (eNB), and mobile stations 200A and 200B (UE). Including.
  • LTE Long Term Evolution
  • eNB base station 100
  • UE mobile stations 200A and 200B
  • the base station 100 is connected to the core network 50.
  • Base station 100 forms cell C1 and performs radio communication with mobile stations 200A and 200B according to the LTE scheme.
  • the base station 100 schedules user data for a plurality of mobile stations (mobile stations 200A and 200B) on the downlink shared physical channel (PDSCH), and the scheduling result of the user data is transmitted to the downlink control physical channel. Notify the plurality of mobile stations via (PDCCH).
  • the priority order of the mobile station is calculated by calculating the sum of the priority of each index by multiplying the priority of each index by the weighting factor. A method of determining based on the value can be considered. In the present embodiment, it is assumed that the higher the numerical priority, the higher the priority.
  • FIG. 2 is a functional block configuration diagram of the base station 100.
  • the base station 100 includes a transmission buffer 101, a PDSCH scheduler 103, a transmission data generation unit 105, a control information generation unit 107, a signal multiplexing unit 109, a signal transmission unit 111, a signal reception unit 113, and a signal separation unit. 115 and CQI management unit 117.
  • the transmission buffer 101 stores data transmitted in the downlink direction, that is, from the base station 100 to the mobile station 200A.
  • the transmission buffer 101 sets a Queue for each bearer set with the mobile station 200A, stores transmission data for the mobile station 200A, and manages a retention amount of the transmission data.
  • the PDSCH scheduler 103 allocates a downlink shared physical channel (PDSCH) to the mobile station 200A.
  • PDSCH downlink shared physical channel
  • the size of the user data is larger than a predetermined size threshold (TH SIZE ), or a radio resource block necessary for transmitting user data Scheduling is performed so that mobile stations (large data size mobile stations) whose number is larger than a predetermined size threshold (TH RB ) are included.
  • TH SIZE predetermined size threshold
  • TH RB predetermined size threshold
  • the PDSCH scheduler 103 prioritizes user data for a normal data size mobile station excluding a large data size mobile station (UE_LaregeData) whose user data size is larger than a predetermined value over a large data size mobile station. And schedule to PDSCH.
  • UE_LaregeData large data size mobile station
  • the PDSCH scheduler 103 When a mobile station that multiplexes user data on PDSCH in a certain subframe is selected from a plurality of mobile stations (mobile stations 200A, 200B,...), The PDSCH scheduler 103 has a margin in the remaining PDCCH resources or the remaining PDCCH multiplexing number In some cases, the mobile station is selected according to a predetermined priority order determined in advance.
  • the PDSCH scheduler 103 transmits the user data with a size of user data larger than a predetermined size threshold (TH SIZE ). For this reason, a mobile station (large data size mobile station) having a larger number of radio resource blocks necessary for this purpose is larger than a predetermined size threshold value (TH RB ).
  • the PDSCH scheduler 103 is necessary for transmitting user data in a mobile station having the predetermined priority level equal to or lower than the predetermined priority threshold value or the user data size being equal to or larger than the predetermined size threshold value (TH SIZE ). If there is no mobile station whose number of radio resource blocks is equal to or greater than the predetermined size threshold (TH RB ), user data is transferred to the PDSCH in order from the mobile station with a predetermined priority regardless of the remaining PDCCH resource or the remaining PDSCH multiplexing number. Multiplexed mobile stations can be selected.
  • the PDSCH scheduler 103 is based on a specific index in a mobile station in which the size of user data is equal to or larger than TH SIZE or the number of radio resource blocks necessary for transmitting user data is equal to or larger than a predetermined size threshold (TH RB ).
  • TH RB predetermined size threshold
  • the PDSCH scheduler 103 is based on a specific index of a mobile station having a high priority that is lower than the maximum number of multiplexed PDSCHs (N MAX ) based on a specific index specified in advance in a large data size mobile station. If it is lower than the priority, it is possible to perform scheduling on the PDSCH from the user data for the mobile station having the predetermined high priority without giving priority to the mobile station having a large data size.
  • N MAX maximum number of multiplexed PDSCHs
  • the PDSCH scheduler 103 does not give priority to the normal data size mobile station when the reception quality information (Channel Quality Indicator) of the mobile station to be scheduled is equal to or lower than a predetermined quality threshold, and the mobile station having a high priority level. It is also possible to schedule to PDSCH from user data for the target.
  • reception quality information Channel Quality Indicator
  • the PDSCH scheduler 103 allocates PDSCH radio resource blocks to a plurality of mobile stations that have decided to multiplex user data on the PDSCH, and the mobile station requires fewer radio resource blocks to transmit user data. Radio resource blocks are allocated from The PDSCH scheduler 103 allocates the radio resource block to the mobile station up to a value obtained by dividing the number of radio resource blocks that can be allocated to the mobile station by the maximum multiplexing number (N MAX ) of the mobile station to the PDCCH.
  • N MAX maximum multiplexing number
  • the transmission data generation unit 105 performs channel coding and data modulation of transmission data stored in the transmission buffer 101, and generates transmission data output to the signal multiplexing unit 109.
  • the control information generation unit 107 performs PDCCH channel coding and data modulation.
  • the signal multiplexing unit 109 multiplexes the data output from the transmission data generation unit 105 and the control information generation unit 107, and outputs the multiplexed signal to the signal transmission unit 111.
  • the signal reception unit 113 outputs the received signal to the signal separation unit 115.
  • the signal separation unit 115 separates the signal output from the signal reception unit 113 into uplink data, BSR, and CQI.
  • the CQI management unit 117 manages the CQI separated by the signal separation unit 115.
  • FIG. 3 shows a scheduling operation flow of the base station 100 according to the present embodiment.
  • the base station 100 determines scheduling priorities for the mobile stations to be scheduled (S10).
  • the priority order determined in S10 is hereinafter referred to as a predetermined priority order.
  • the base station 100 determines the multiplexable number (N remain ) on the PDCCH as the maximum multiplex number N MAX of mobile stations on the PDCCH (S20).
  • N remain a value obtained by subtracting the usage amount from N MAX is defined as N remain .
  • the base station 100 selects a mobile station that multiplexes user data on the PDSCH from the top of a predetermined priority order, and decrements N remain each time a mobile station is selected.
  • N remain ⁇ N UE_LargeData a mobile station that satisfies one or both of the following conditions is selected (S30 to S90).
  • the base station 100 moves a mobile station in which the size of user data to be transmitted is greater than or equal to TH SIZE (predetermined size threshold), or a move in which the number of radio resource blocks necessary for transmitting user data is greater than or equal to TH RB. Select a station.
  • TH SIZE predetermined size threshold
  • base station 100 selects mobile stations (users) in order from the top of the original predetermined priority. Specifically, within a mobile station range R search for a predetermined priority, the size of user data is equal to or greater than TH SIZE , or the number of radio resource blocks required for transmitting user data is equal to or greater than TH RB . In a mobile station in which there is no user and the size of user data is equal to or greater than TH SIZE , or the number of radio resource blocks required for transmitting user data is equal to or greater than TH RB , the priority based on a specific index is predetermined. This is a case where the priority is lower than the priority based on the index of an unselected mobile station higher than the mobile station.
  • the “priority based on a specific index” may be a priority based on a traffic type, for example.
  • the priority of the voice service is higher than the priority of the best effort service, the mobile station using the best effort service is not given priority even if the size of the transmission data is large.
  • TH CQI a predetermined quality threshold
  • the PDSCH radio resource block allocation is executed in order from the mobile station having the smallest number of radio resource blocks necessary for transmitting user data.
  • the number of radio resource blocks necessary for transmitting user data may be determined from the sum of all user data related to the mobile station and the value of CQI. This makes it possible to allocate radio resource blocks with good reception status to mobile stations with a small number of allocated radio resource blocks. Furthermore, all surplus radio resource blocks can be allocated to a mobile station having a large user data size.
  • the upper limit of the number of allocated radio resource blocks per mobile station is 1 / (number of multiplexing-number of mobile stations to which radio resource block has been allocated) of the number of radio resource blocks that can be allocated.
  • the number of assignable radio resource blocks is the number of usable radio resource blocks excluding the number of radio resource blocks assigned to a common channel and the like and the number of radio resource blocks already assigned to another mobile station.
  • the value of the number of mobile stations N UE_LargeData may be variably controlled according to the number of downlink bearers set in the cell C1.
  • FIG. 4 shows an example of a table used when N UE_LargeData is variably controlled.
  • the threshold for the number of bearers and the value of N UE_LargeData may refer to different tables depending on the system bandwidth. According to such a table, the PDSCH scheduler 103 increases TH SIZE and TH RB (predetermined size threshold) as the number of radio access bearers in the downlink set with the mobile station increases. Can be increased.
  • the base station 100 may set the remaining resource amount (the number of CCEs) of the PDCCH to N CCE_remain .
  • N CCE_remain is the number of CCEs that can be used without including the CCE consumed in the PDCCH for common channel transmission such as broadcast information.
  • the base station 100 selects a mobile station that multiplexes user data on the PDSCH from the top of the predetermined priority. Each time the base station 100 selects a mobile station, the base station 100 calculates the number of CCEs consumed to transmit the PDCCH to the selected mobile station. The calculated number of CCE's was subtracted from the N CCE_remain value as a new N CCE_remain. When N CCE_remain ⁇ TH CCE , a mobile station that satisfies the above-described condition is selected (see S30 to S90 described above). TH CCE is a threshold for the number of remaining CCEs.
  • a large data size mobile station having a user data size larger than a predetermined value can be appropriately allocated to the PDSCH.
  • the use efficiency of the PDSCH can be improved even when the number of mobile stations that can be multiplexed on the PDCCH is limited.
  • the value of N UE_LargeData is variably controlled according to the number of downlink bearers set in the cell C1, but such control is not necessarily required. .
  • the characteristics of the present invention when small-size user data for a plurality of mobile stations is multiplexed on a downlink shared physical channel (PDSCH) in a subframe, the number of multiplexable mobile stations on the downlink control physical channel is limited. Even in such a situation, it is possible to provide a base station and a communication control method that can improve the utilization efficiency of the downlink shared physical channel.
  • PDSCH downlink shared physical channel
  • Core network 100 Base station 101 ... Transmission buffer 103 ... PDSCH scheduler 105 ... Transmission data generation unit 107 ... Control information generation unit 109 ... Signal multiplexing unit 111 ... Signal transmission unit 113 ... Signal reception unit 115 ... Signal separation unit 117 ... CQI management unit 200A, 200B ... mobile station cell ... C1

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention porte sur une station de base et un procédé de commande de communication tels que quand, dans une sous-trame, des données d'utilisateur de petite dimension pour une pluralité de stations mobiles sont multiplexées dans un canal partagé de liaison descendante physique (PDSCH), il est possible d'augmenter l'efficacité d'utilisation du canal partagé de liaison descendante physique même dans des situations dans lesquelles il existe une limite au nombre possible de stations mobiles multiplexées dans un canal de commande de liaison descendante physique. La station de base (100) comprend un planificateur de PDSCH (103) qui effectue une planification de manière à ce qu'une station mobile à grande dimension de données, ayant une dimension de données d'utilisateur supérieure à un seuil de dimension prédéterminé, soit incluse en tant que station mobile qui fait l'objet d'un multiplexage de données d'utilisateur. Le planificateur de PDSCH (103) sélectionne une station mobile qui fait l'objet d'un multiplexage de données d'utilisateur en fonction d'un rang de priorité prédéterminé quand le nombre de ressources de canal de commande de liaison descendante physique résiduelles planifiables ou de canaux partagés de liaison descendante physiques résiduels planifiables qui peuvent être multiplexés est au moins égal à un seuil de multiplexage prédéterminé, et quand ce nombre est inférieur ou égal au seuil de multiplexage prédéterminé, effectue une planification en donnant priorité à la station mobile à grande dimension de données.
PCT/JP2012/069846 2011-09-09 2012-08-03 Station de base et procédé de commande de communication WO2013035467A1 (fr)

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JP2011197595A JP5848924B2 (ja) 2011-09-09 2011-09-09 基地局及び通信制御方法
JP2011-197595 2011-09-09

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108496408A (zh) * 2016-01-26 2018-09-04 株式会社Ntt都科摩 基站及发送方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6754734B2 (ja) * 2017-07-11 2020-09-16 株式会社Ｎｔｔドコモ Ｒａｎスライスにおけるリソース管理装置及びｒａｎスライスにおけるリソース管理方法

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JP2004040786A (ja) * 2002-06-03 2004-02-05 Lucent Technol Inc スケジューリング方法
WO2008105418A1 (fr) * 2007-03-01 2008-09-04 Ntt Docomo, Inc. Dispositif de station de base, dispositif d'utilisateur, et procédé de commande de communication
JP2009530876A (ja) * 2006-01-18 2009-08-27 テレフオンアクチーボラゲット エル エム エリクソン（パブル） 局所および分散送信
WO2009133953A1 (fr) * 2008-05-02 2009-11-05 株式会社エヌ・ティ・ティ・ドコモ Station de base radio et procédé de contrôle des communications

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004040786A (ja) * 2002-06-03 2004-02-05 Lucent Technol Inc スケジューリング方法
JP2009530876A (ja) * 2006-01-18 2009-08-27 テレフオンアクチーボラゲット エル エム エリクソン（パブル） 局所および分散送信
WO2008105418A1 (fr) * 2007-03-01 2008-09-04 Ntt Docomo, Inc. Dispositif de station de base, dispositif d'utilisateur, et procédé de commande de communication
WO2009133953A1 (fr) * 2008-05-02 2009-11-05 株式会社エヌ・ティ・ティ・ドコモ Station de base radio et procédé de contrôle des communications

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108496408A (zh) * 2016-01-26 2018-09-04 株式会社Ntt都科摩 基站及发送方法
CN108496408B (zh) * 2016-01-26 2023-10-20 株式会社Ntt都科摩 基站及发送方法

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JP2013059001A (ja) 2013-03-28
JP5848924B2 (ja) 2016-01-27

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