WO2017143893A1 - Procédés et dispositifs de planification de transmissions dans un système de communication cellulaire - Google Patents

Procédés et dispositifs de planification de transmissions dans un système de communication cellulaire Download PDF

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Publication number
WO2017143893A1
WO2017143893A1 PCT/CN2017/071659 CN2017071659W WO2017143893A1 WO 2017143893 A1 WO2017143893 A1 WO 2017143893A1 CN 2017071659 W CN2017071659 W CN 2017071659W WO 2017143893 A1 WO2017143893 A1 WO 2017143893A1
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WIPO (PCT)
Prior art keywords
scheduling request
component carrier
wireless communication
communication device
scheduling
Prior art date
Application number
PCT/CN2017/071659
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English (en)
Inventor
Efstathios KATRANARAS
Olivier Marco
Thomas Winiecki
Guillaume Vivier
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Jrd Communication Inc.
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Filing date
Publication date
Application filed by Jrd Communication Inc. filed Critical Jrd Communication Inc.
Priority to CN201780011419.9A priority Critical patent/CN109076519B/zh
Publication of WO2017143893A1 publication Critical patent/WO2017143893A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/21—Control channels or signalling for resource management in the uplink direction of a wireless link, i.e. towards the network
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/002—Transmission of channel access control information
    • H04W74/004—Transmission of channel access control information in the uplink, i.e. towards network

Definitions

  • Embodiments of the present invention generally relate to cellular communication systems and in particular to devices and methods for scheduling transmissions from a User Equipment to network elements of the cellular communication system.
  • a wireless communication system typically comprises a plurality of radio network subsystems, each radio network subsystem comprising one or more cells to which UEs may attach, and thereby connect to the network.
  • Each macro-cellular RNS further comprises a controller, in a form of a Radio Network Controller (RNC) , operably coupled to the one or more NodeBs.
  • RNC Radio Network Controller
  • Communication systems and networks have developed towards a broadband and mobile system.
  • the 3rd Generation Partnership Project has developed a Long Term Evolution (LTE) solution, namely, an Evolved Universal Mobile Telecommunication System Territorial Radio Access Network, (E-UTRAN) , for a mobile access network, and a System Architecture Evolution (SAE) solution, namely, an Evolved Packet Core (EPC) , for a mobile core network.
  • LTE Long Term Evolution
  • E-UTRAN Evolved Universal Mobile Telecommunication System Territorial Radio Access Network
  • SAE System Architecture Evolution
  • EPC Evolved Packet Core
  • a macrocell in an LTE system is supported by a base station known as an eNodeB or eNB (evolved NodeB) .
  • LTE-Advanced has introduced the concept of Carrier Aggregation (CA) in order to increase bandwidth.
  • CA Carrier Aggregation
  • Each aggregated carrier is referred to as a Component Carrier (CC) .
  • CC Component Carrier
  • a concept of primary cell (PCell) and secondary cell (SCell) has been introduced to support CA.
  • the PCell which is akin to a serving cell in the non-CA case, is typically used (amongst other functions) for PUCCH (Physical Uplink Channel) transmissions and RRC (Radio Resource Control) connection and re-establishment.
  • An SCell may be added to the PCell or a set of serving cells through an RRC connection reconfiguration procedure.
  • UL grants are sent to UEs using dynamic scheduling (i.e. using the so-called Scheduling Request (SR) procedure) , random access procedure or Semi-Persistent Scheduling (SPS) .
  • SR Scheduling Request
  • SPS Semi-Persistent Scheduling
  • SR Scheduling Request
  • PUCCH Physical Uplink Control Channel
  • the overall latency for uplink transmission delay of a first packet in a burst depends on how fast an uplink grant is received at the particular UE which has data ready to transmit.
  • Scheduling Request periodicity is typically 10ms and studies have shown that the waiting time for an SR opportunity for a UE is around 30%of the overall Radio Access Network delay. Further studies have revealed that any improvement that can be made in latency reduction for transmitting the first uplink packet in a burst can have a significant effect on the overall TCP/IP (Transmission Control Protocol/Internet Protocol) throughput.
  • TCP/IP Transmission Control Protocol/Internet Protocol
  • sr-ProhibitTimer-r9 a Scheduling Request prohibit timer (sr-ProhibitTimer-r9) was introduced.
  • the sr-ProhibitTimer-r9 Information Element is under mac-MainConfig and it can take values from 0 to 7.
  • the sr-ProhibitTimer value is typically a number of SR period (s) .
  • Value 0 means that no timer for SR transmission on a PUCCH is configured.
  • Value 1 corresponds to one SR period
  • value 2 corresponds to 2*SR periods and so on.
  • a UE will start this timer after transmitting an SR. When the timer is running, the UE is effectively prohibited from transmitting an SR on the PUCCH.
  • the UE’s MAC entity instructs the physical channels to send the SR when the first opportunity arises and the UE MAC (Median Access Control) entity chooses one SR when SRs on PUCCH SCell and PCell are in the same TTI (Transmission Time Interval) .
  • TTI Transmission Time Interval
  • Which one to choose is left to the UE’s implementation. For example, if multiple PUCCH resources for SR are valid for a TTI, due to multiple CCs available for SR transmission at the same time, it is left to UE implementation to decide which PUCCH resource to be used.
  • a method for scheduling a transmission from a wireless communication device in a cellular communication system which supports Carrier Aggregation including: configuring the wireless communication device with a scheduling request prohibit timer (sr-ProhibitTimer) ; configuring the wireless communication device with a first Component Carrier configuration; configuring the wireless communication device with a second Component Carrier configuration; configuring the wireless communication device with a first Scheduling Request configuration in respect of the first Component Carrier; configuring the wireless communication device with a second Scheduling Request configuration in respect of the second Component Carrier; identifying a Scheduling Request opportunity on one of the first and second Component Carriers, transmitting a Scheduling Request on the identified Component Carrier; starting the scheduling request prohibit timer, identifying a further Scheduling Request opportunity on the other Component Carrier and sending a Scheduling Request on the other Component Carrier prior to expiry of the scheduling request prohibit timer.
  • a scheduling request prohibit timer sr-ProhibitTimer
  • the cellular communication system may be an LTE Advanced system.
  • the invention is applicable to Component Carriers which are licensed or unlicensed.
  • the method can enhance SR configuration procedure in cases where more than one UL SR-configured PUCCH CC is serving a UE.
  • a wireless communication device MAC entity has the ability to ignore the sr-ProhibitTimer for Scheduling Request opportunities arising on CCs that have not yet been used to send a Scheduling Request.
  • MAC protocol enhancements may be introduced to improve SR procedure when multiple PUCCH Component Carriers (CCs) are SR-configured to serve an LTE CA-enabled UE in connected mode.
  • CCs PUCCH Component Carriers
  • Scheduling Request opportunity realised at the UE MAC entity.
  • a UE is allowed to select an additional carrier for sending a scheduling request even though the sr-ProhibitTimer inhibiting such sending is still running.
  • the Scheduling Request procedure becomes more robust and a UE can send its first packet to an eNB, with less delay than is currently the case.
  • the method further includes sending a message from the wireless communication device to a network element of the cellular communication system whereby the wireless communication device informs the network element of its capability to transmit Scheduling Requests prior to expiry of the scheduling request prohibit timer.
  • a Scheduling Request configuration in respect of at least one Component Carrier may be modified by the network element in response to receipt of the message.
  • the network element may be an eNB. If the eNB knows of this UE MAC entity behaviour then it can jointly configure the scheduling of SR opportunities from multiple Component Carriers in order to provide more frequent grant opportunities and therefore further reduce the average latency for a first uplink packet sent from a UE. Delay-sensitive applications in particular can benefit from this embodiment.
  • the flexibility of a scheduler in an eNB is enhanced in cases where the sr-ProhibitTimer would present a bottleneck for a CC that could be used more often for SR opportunities by the UE or which experiences variable quality channel conditions over a short-time period.
  • a wireless communication device for use in a cellular communication system which supports Carrier Aggregation, wherein the wireless communication device is configured with a scheduling request prohibit timer (sr-ProhibitTimer) and arranged to: receive first and second Component Carrier configurations, receive first and second Scheduling Request configurations in respect of the first and second Component Carriers, identify a Scheduling Request opportunity on one of the first and second Component Carriers, transmit a Scheduling Request on the identified Component Carrier; start the scheduling request prohibit timer, identify a further Scheduling Request opportunity on the other Component Carrier and send a Scheduling Request on the other Component Carrier prior to expiry of the scheduling request prohibit timer.
  • a scheduling request prohibit timer sr-ProhibitTimer
  • the wireless communication device may be configured with more than two Component Carrier configurations and Scheduling Request configurations.
  • the wireless communication device is arranged to configure an index associated with each Component Carrier whose state depends on whether a Component Carrier has been used to send a Scheduling Request.
  • the wireless communication device may be a User Equipment or similar mobile communications device.
  • the invention may be used to introduce RRC protocol enhancements in order to improve Scheduling Request procedure when multiple PUCCH CCs are SR-configured to serve an LTE CA-enabled UE in connected mode.
  • a non-transitory computer readable medium having computer readable instructions stored thereon for execution by a processor to perform the method according to the first aspect.
  • the non-transitory computer readable medium may comprise at least one from a group consisting of: a hard disk, a CD-ROM, an optical storage device, a magnetic storage device, a Read Only Memory, a Programmable Read Only Memory, an Erasable Programmable Read Only Memory, EPROM, an Electrically Erasable Programmable Read Only Memory and a Flash memory.
  • Figure 1 is a simplified block diagram of a part of a cellular communication system and operating in accordance with an example embodiment.
  • Figure 2 is a simplified flowchart illustrating an example of a method for scheduling transmissions from a UE.
  • Figure 3 is a simplified flowchart illustrating an example of operation of a User Equipment.
  • an example of part of an LTE cellular communication system operating in accordance with embodiments of the invention is illustrated and indicated generally at 100 and comprises an evolved Node B (eNB) 101.
  • the eNB 101 includes a scheduler 102 and a transceiver 103.
  • the eNB 101 utilises Carrier Aggregation and supports a first Component Carrier (CCx) and a second Component Carrier (CCy) which are represented respectively by cells 104 and 105.
  • CCx Component Carrier
  • CCy Component Carrier
  • more than two component carriers may be supported by the eNB 101.
  • a User Equipment (UE) 106 which is CA-enabled is located within the coverage areas of both cells 104, 105.
  • the transceiver 103 is arranged in a conventional manner to transmit and receive communication signals and data to and from the User Equipment 106.
  • the User Equipment 106 is configured with a single scheduling request prohibit timer (sr-ProhibitTimer) 107 and a transmitter/receiver arrangement 108 for sending and receiving transmissions to and from the eNB 101.
  • sr-ProhibitTimer single scheduling request prohibit timer
  • the eNB 101 communicates with UEs (for example UE106) which are CA-enabled and in connected mode and that can be semi-statically configured with more than one UL CC.
  • UEs for example UE106
  • the UEs can also be configured with periodic SR opportunities both on the first Component Carrier and also on the second Component Carrier and have them activated to serve the UE at the same time.
  • the scheduler 102 in the eNB may regularly monitor uplink scheduling load and UE activity and use this information for dynamically adapting SR scheduling parameters between the two Component Carriers CCx and CCy) .
  • the UE MAC entity instructs PHY to send a SR when the first opportunity arrives and any subsequent SR opportunities (including those related to another CC) will not be considered while the sr-ProhibitTimer is running.
  • the UE MAC entity of UE 106 considers other SR opportunities arising on other component carriers even while the sr-ProhibitTimer is running.
  • the sr-ProhibitTimer Information Element is configured in MAC-MainConfig for a cell group (i.e. for all CCs originating from a single eNB, CCx and CCy in the example of Figure 1) .
  • UE 106 had a requirement to send a Scheduling Request every 2 ms in order to satisfy data latency constraints.
  • CCx can only (due to SR load constraints) offer opportunities every 4ms while CCy can offer opportunities every 2ms. If the sr- periodicity of both CCx and CCy were set at 2 ms and the sr-ProhibitTimer value was to be set at zero, the SR load on CCx would be unacceptable. On the other hand, if the sr-ProhibitTimer value were to be set at 1 it would not be possible to perfectly interleave the two component carriers CCx and CCy. By allowing the UE to ignore the sr-ProhibitTimer, the present invention sidesteps these problems.
  • a single sr-ProhibitTimer is configured in the UE 106.
  • a first Component Carrier CCx (represented by the cell 104 in Figure 1) is configured in the UE 106 by the eNB 101 transmitting the necessary configuration signalling. This configuration is carried out in accordance with known techniques (including, for example RRC connection procedures) .
  • a Scheduling Request Configuration for the Component Carrier CCx is configured in the UE 106 by the eNB 101 transmitting a Scheduling Request Configuration comprising a Scheduling Request Configuration Information Element.
  • This Scheduling Request Configuration basically informs the UE of the PUCCH resources which will be available on the Component Carrier CCx for making a Scheduling Request.
  • the second Component Carrier CCy (represented by the cell 105 in Figure 1) is configured in the UE 106 by the eNB 101 transmitting the necessary configuration signalling. This configuration is carried out in accordance with known Carrier Aggregation techniques.
  • a Scheduling Request Configuration for CCy is configured in the UE 106 by the eNB 101 transmitting a Scheduling Request Configuration comprising a Scheduling Request Configuration Information Element.
  • This Scheduling Request Configuration basically informs the UE of the PUCCH resources which will be available on the second Component Carrier CCy for making a Scheduling Request.
  • the UE 106 identifies the first Scheduling Request opportunity that arises on either Component Carrier and sends a Scheduling Request in accordance with conventional techniques to the eNB 101.
  • the sr-ProhibitTimer starts running (at 207) . Even before the sr-ProhibitTimer has expired, the UE 106 looks for further SR opportunities on another Component Carrier.
  • the UE 106 can send, at 209, a further SR on the other Component Carrier.
  • the UE 106 can transmit a packet of data to the eNB, at 210 and then terminate the SR procedure.
  • Just one SR procedure runs at UE MAC entity, therefore maintaining compatibility with currently defined procedures.
  • the embodiment of Figure 2 is also compatible with the agreement for having a single sr-ProhibitTimer for multiple Component Carriers in a group.
  • the behaviour of the UE of overriding the sr-ProhibitTimer can be a matter of choice. In a delay tolerant application for example, it may be considered to be more beneficial to put less strain on the UE and network (from having to deal with an increased number of SRs) rather than reduce the latency of UL data. If the scenario is considered fitting, the UE 106 could independently decide to apply such behaviour or alternatively, the eNB 101 could configure (by RRC signalling) such behaviour for the UE. Otherwise the SR operation can operate as conventional.
  • the UE 106 is arranged to configure an index associated with each SR-configured serving Component Carrier whose state depends on whether a Component Carrier has been used to send a Scheduling Request. Such an embodiment will now be described with reference to Figure 3 and Figure 1.
  • an index is defined for each SR-configured serving CC (CCx and CCy of Figure 1 for example) .
  • the sr-ProhibitTimer applies to the CC as in the conventional case.
  • the sr-ProhibitTimer is ignored in respect of that CC thereby allowing selection of that CC (as an additional carrier) for sending the SR even though the sr-ProhibitTimer is running.
  • the Component Carrier has been used to send a SR and once the SR has been sent and the sr-ProhibitTimer has started running, the index state cannot be changed until the specific SR procedure ends.
  • each index for each CC is set to “initial” .
  • the UE checks to determine whether the sr-ProhibitTimer is running and also checks the index of each CC with an SR opportunity to identify those CCs whose index is currently set at “initial” , “override” and “used” states.
  • a set of “valid” CCs is created.
  • a CC is included in this set only if it offers an SR opportunity at a particular TTI of interest and (i) the sr-ProhibitTmer is not running/has expired; or (ii) the sr-ProhibitTimer is running but the CC’V index is in the “override” state (and thus the sr-ProhibitTimer is ignored) .
  • a CC is chosen from the set of valid CCs and as long as the sr-TransMax has not been reached, an SR is sent on this chosen CC.
  • the sr-ProhibitTimer starts, at 305, and in addition, at 306, the index of that CC is changed to “used” if not already in that state, and the indices of all other CCs in “initial” state, if any, are changed to “override. ”
  • the eNB 101 of Figure 1 is modified such that it is made aware of the capability of the UE 106 to ignore the sr-ProhibitTimer; as described above with reference to Figures 2 and 3.
  • the scheduler 102 of the eNB 101 uses this information in order to optimise the joint configurations of SR-related parameters on different Component Carriers resulting in further reductions of latency of a first packet in a burst sent by the UE 106.
  • the scheduler 102 If the scheduler 102 knows that the UE can ignore the sr-ProhibitTimer, it will determine that the better configuration to use is the first configuration because even if a failure on first (or even second) SR transmission should occur, the next opportunity will arise at the immediately following TTI.
  • Notification of such UE capability to an eNB could be done in various ways (e.g. signalling such capability at UE initiation, or during operation when this can change dynamically, by RRC or L1 signalling, etc. ) .
  • UE MAC entity has the ability to treat the sr-ProhibitTimer differently for SR opportunities arising from different CCs. To give the above ability to a UE, additional signalling from the eNB to the UE would be needed in order to notify the UE of the appropriate interpretation for each CC.
  • the signal processing functionality of the embodiments of the invention may be achieved using computing systems or architectures known to those who are skilled in the relevant art.
  • Computing systems such as, a desktop, laptop or notebook computer, hand-held computing device (PDA, cell phone, palmtop, etc. ) , mainframe, server, client, or any other type of special or general purpose computing device as may be desirable or appropriate for a given application or environment can be used.
  • the computing system can include one or more processors which can be implemented using a general or special-purpose processing engine such as, for example, a microprocessor, microcontroller or other control module.
  • the computing system can also include a main memory, such as random access memory (RAM) or other dynamic memory, for storing information and instructions to be executed by a processor. Such a main memory also may be used for storing temporary variables or other intermediate information during execution of instructions to be executed by the processor.
  • the computing system may likewise include a read only memory (ROM) or other static storage device for storing static information and instructions for a processor.
  • ROM read only memory
  • the computing system may also include an information storage system which may include, for example, a media drive and a removable storage interface.
  • the media drive may include a drive or other mechanism to support fixed or removable storage media, such as a hard disk drive, a floppy disk drive, a magnetic tape drive, an optical disk drive, a compact disc (CD) or digital video drive (DVD) read or write drive (R or RW) , or other removable or fixed media drive.
  • Storage media may include, for example, a hard disk, floppy disk, magnetic tape, optical disk, CD or DVD, or other fixed or removable medium that is read by and written to by media drive.
  • the storage media may include a computer-readable storage medium having particular computer software or data stored therein.
  • an information storage system may include other similar components for allowing computer programs or other instructions or data to be loaded into the computing system.
  • Such components may include, for example, a removable storage unit and an interface , such as a program cartridge and cartridge interface, a removable memory (for example, a flash memory or other removable memory module) and memory slot, and other removable storage units and interfaces that allow software and data to be transferred from the removable storage unit to computing system.
  • the computing system can also include a communications interface.
  • a communications interface can be used to allow software and data to be transferred between a computing system and external devices.
  • Examples of communications interfaces can include a modem, a network interface (such as an Ethernet or other NIC card) , a communications port (such as for example, a universal serial bus (USB) port) , a PCMCIA slot and card, etc.
  • Software and data transferred via a communications interface are in the form of signals which can be electronic, electromagnetic, and optical or other signals capable of being received by a communications interface medium.
  • computer program product may be used generally to refer to tangible media such as, for example, a memory, storage device, or storage unit.
  • These and other forms of computer-readable media may store one or more instructions for use by the processor comprising the computer system to cause the processor to perform specified operations.
  • Such instructions generally referred to as ‘computer program code’ (which may be grouped in the form of computer programs or other groupings) , when executed, enable the computing system to perform functions of embodiments of the present invention.
  • the code may directly cause a processor to perform specified operations, be compiled to do so, and/or be combined with other software, hardware, and/or firmware elements (e.g., libraries for performing standard functions) to do so.
  • the software may be stored in a computer-readable medium and loaded into computing system using, for example, removable storage drive.
  • a control module in this example, software instructions or executable computer program code
  • the processor in the computer system when executed by the processor in the computer system, causes a processor to perform the functions of the invention as described herein.
  • inventive concept can be applied to any circuit for performing signal processing functionality within a network element. It is further envisaged that, for example, a semiconductor manufacturer may employ the inventive concept in a design of a stand-alone device, such as a microcontroller of a digital signal processor (DSP) , or application-specific integrated circuit (ASIC) and/or any other sub-system element.
  • DSP digital signal processor
  • ASIC application-specific integrated circuit
  • aspects of the invention may be implemented in any suitable form including hardware, software, firmware or any combination of these.
  • the invention may optionally be implemented, at least partly, as computer software running on one or more data processors and/or digital signal processors or configurable module components such as FPGA devices.
  • the elements and components of an embodiment of the invention may be physically, functionally and logically implemented in any suitable way. Indeed, the functionality may be implemented in a single unit, in a plurality of units or as part of other functional units.

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

Abstract

Dans un système de communication cellulaire LTE (100) avec agrégation de porteuses selon l'invention, un UE (106) est configuré pour ignorer le temporisateur d'interdiction de requête de planification (107) qui est paramétré pour fonctionner sur la transmission d'une requête de planification sur une porteuse composante et pour envoyer d'autres requêtes de planification sur d'autres porteuses composantes avant l'expiration de la temporisation (107). Cela peut entraîner une réduction de la latence moyenne pour un paquet de liaison montante envoyé d'un UE (106) à un eNode B (101).
PCT/CN2017/071659 2016-02-25 2017-01-19 Procédés et dispositifs de planification de transmissions dans un système de communication cellulaire WO2017143893A1 (fr)

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CN201780011419.9A CN109076519B (zh) 2016-02-25 2017-01-19 蜂窝通信系统中调度传输的方法和装置

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GB1603246.8 2016-02-25
GB1603246.8A GB2547671B (en) 2016-02-25 2016-02-25 Methods and devices for scheduling transmissions in a cellular communication system

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GB2547671B (en) 2018-04-18

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