WO2018113928A1 - Système de communication sans fil ayant de multiple porteuses radio - Google Patents

Système de communication sans fil ayant de multiple porteuses radio Download PDF

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Publication number
WO2018113928A1
WO2018113928A1 PCT/EP2016/081959 EP2016081959W WO2018113928A1 WO 2018113928 A1 WO2018113928 A1 WO 2018113928A1 EP 2016081959 W EP2016081959 W EP 2016081959W WO 2018113928 A1 WO2018113928 A1 WO 2018113928A1
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WO
WIPO (PCT)
Prior art keywords
tti
reallocation
configuration
bearer
radio bearer
Prior art date
Application number
PCT/EP2016/081959
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English (en)
Inventor
Jingyi Liao
Original Assignee
Huawei Technologies Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Priority to PCT/EP2016/081959 priority Critical patent/WO2018113928A1/fr
Publication of WO2018113928A1 publication Critical patent/WO2018113928A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
    • H04W72/543—Allocation or scheduling criteria for wireless resources based on quality criteria based on requested quality, e.g. QoS

Definitions

  • the invention relates to devices for use in a wireless communication system.
  • the invention relates to a scheduling node and a Mobility
  • Management Entity for use in a wireless communication system allowing multiple bearers to be set up between a network node and a user equipment.
  • TTI Transmission Time Interval
  • UMTS Universal Mobile Telecommunications System
  • the TTI is related to the size of the data blocks passed from higher network layers to the radio link layer. The time required to transmit one such block determines the length of the TTI.
  • Orthogonal frequency-division multiplexing, symbols, OS Orthogonal frequency-division multiplexing, symbols, OS.
  • sTTI short TTI
  • the packet latency can be reduced with a reduction of transport time of data and control by addressing the length of a TTI. It can be proved that the length of a TTI has an impact on both the time for
  • a UE User Equipment
  • DL (Downlink) data transmission is scheduled in a short TTI (sTTI)
  • sTTI short TTI
  • a UE can simultaneously have several different TTI settings, for example, a UE can simultaneously have a legacy LTE TTI (14 OFDM symbol) for PDSCH, and at least one short TTI size (from 1 up to 7 OFDM symbol) for sPDSCH. If the UE have multiple bearers transmitting in the DL, these bearers can be carried on either PDSCH or sPDSCH.
  • Each bearer provides a transport service for the traffic streams with specific QoS (Quality of Service) attributes.
  • QoS parameters associated to a bearer are typically: QoS Class Identifier(QCI), Allocation and Retention Priority(ARP), Guaranteed Bit Rate(GBR) and UE Aggregate Maximum Bitrate(AMBR).
  • Different bearers can have different latency requirements, and a short TTI can reduce latency, on the other hand larger TTI can have less transmission overhead.
  • a problem is then how to enable a good traffic bearer efficiency on the different TTIs, and at the same time meet the per bearer requirement(s). There is a constant desire to improve the performance of wireless
  • a scheduler adapted for a wireless communication system is provided.
  • the wireless communication system is configured to allow multiple bearers and respective radio bearers between the wireless communication system and a user equipment, UE.
  • the scheduler is adapted to receive a radio bearer Transmission Time Interval, TTI reallocation configuration and a bearer information for the respective radio bearer, or to receive a UE related TTI reallocation configuration and a UE reconfiguration information; and to determine a reallocation of bearer data based on an available transport block resource for an at least one Transmission Time Interval, TTI and either the received radio bearer TTI reallocation configuration or the received UE related TTI reallocation configuration.
  • TTI Transmission Time Interval
  • the scheduler is adapted to reallocate the bearer data to another radio bearer TTI when the available transport block resource for the another radio bearer TTI is configured to carry the bearer data.
  • the TTI for a radio bearer can be dynamically changed.
  • the scheduler is adapted to check if the reallocation to another radio bearer TTI is allowed based on an at least one received pre-determined condition and then adapted to make the reallocation to another radio bearer TTI for the respective radio bearer.
  • TTI a condition such as a Quality of Service, an average Packet Data Unit, PDU, size for the radio bearer, and a UE capability.
  • the received radio bearer TTI reallocation configuration or the received UE related TTI reallocation configuration comprises an information about at least one TTI setting for an individual radio bearer.
  • an individual setting of a radio bearer TTI can be made.
  • the received bearer TTI reallocation configuration or the received UE related TTI reallocation configuration comprises an information about a different TTI setting for an uplink transmission and a downlink transmission, respectively.
  • the radio bearers are allowed to have different TTI settings in the Uplink and the Downlink, which can be advantageous since there can exist different transmission requirements in the different transmission directions.
  • the scheduler as set out above can be located in an eNodeB comprising a transceiver for transmitting and receiving data to/from a UE.
  • an eNodeB with an improved scheduler can be provided.
  • the eNodeB is adapted to send a radio bearer TTI reallocation configuration to a UE in a Radio Resource Control, RRC, message.
  • RRC Radio Resource Control
  • the eNodeB is adapted to send a radio bearer TTI reallocation configuration to a UE as a Downlink Control Information on a Physical Downlink Control Channel, PDCCH.
  • a radio bearer TTI can be changed using Downlink control information signaling.
  • the scheduler as set out above can be located in a UE comprising a transceiver for transmitting and receiving data to/from an eNodeB.
  • a UE with an improved scheduler can be provided.
  • the UE is adapted to receive a TTI reallocation configuration in a non-Access Stratum, NAS, message.
  • the UE can receive a TTI setting from a mobility management entity, MME.
  • the UE is adapted to receive a TTI reallocation configuration in a Radio Resource Control, RRC, message.
  • RRC Radio Resource Control
  • the UE is adapted to receive a TTI reallocation configuration as a Downlink Control Information on a Physical Downlink Control Channel, PDCCH.
  • PDCCH Physical Downlink Control Channel
  • the UE can receive a TTI setting from an eNodeB.
  • a Mobility Management Entity, MME for a wireless communication system is provided.
  • the wireless communication system is configured to allow multiple bearers and respective radio bearers between the wireless communication system and a user equipment, UE.
  • the Mobility Management Entity is adapted to receive bearer information of at least one bearer set up between a Serving Gateway of the wireless communication system and the UE and to determine a radio bearer Transmission Time Interval, TTI, reallocation configuration for at least one radio bearer.
  • TTI Transmission Time Interval
  • the TTI reallocation configuration can then be sent.
  • a TTI setting can be changed by the MME.
  • the Mobility Management Entity is adapted to send the TTI reallocation configuration to the UE via an eNodeB.
  • a changed TTI setting can be sent to the UE.
  • the Mobility Management Entity is adapted to send the radio bearer TTI reallocation configuration in a non- Access Stratum, NAS, message.
  • NAS signaling can be used to change a TTI setting.
  • the TTI reallocation configuration comprises an information about TTI reallocation configurations that are allowed for said at least one radio bearer.
  • TTI reallocation configurations that are allowed for said at least one radio bearer.
  • the TTI reallocation configuration comprises an information about different TTI reallocation configurations for downlink and uplink transmission, respectively for said at least one radio bearer.
  • the radio bearers are allowed to have different TTI settings in the Uplink and the Downlink, which can be advantageous since there can exist different transmission requirements in the different transmission directions.
  • the invention also extends to methods for using the MME and scheduler in accordance with the above.
  • a method performed in a Mobility Management Entity adapted to be used in a wireless communication system is provided.
  • the wireless communication system is configured to allow multiple bearers and respective radio bearers between the wireless communication system and a user equipment UE.
  • the method comprises receiving bearer information of at least one bearer set up between a serving Gateway of the wireless communication system and the UE and determining a radio bearer Transmission Time Interval, TTI, reallocation configuration for at least one radio bearer.
  • the method further comprises sending the TTI reallocation configuration.
  • a method performed in a Scheduler of a UE or an eNodeB of a wireless communication system is provided.
  • the wireless communication system is configured to allow multiple bearers and respective radio bearers between the wireless communication system and a user equipment, UE.
  • the method comprises receiving a radio bearer Transmission Time Interval, TTI reallocation configuration and a bearer information for each bearer, or receiving a UE related TTI reallocation configuration and a UE reconfiguration information.
  • the method further comprises determining a reallocation of bearer data based on an available transport block resource for an at least one TTI and either the received radio bearer TTI reallocation configuration or the received UE related TTI reallocation configuration.
  • Fig. 1 shows a wireless communication system
  • Fig. 2 shows a conventional multiplexing scheme
  • Fig. 3 shows RRC signaling including TTI signaling
  • Fig. 4 shows PDCCH signaling including TTI signaling
  • Fig. 5 shows NAS signaling including TTI signaling
  • Fig. 6 illustrates multiplexing to different TTIs based on a multiplexing policy
  • Fig. 7 illustrates procedures performed by a scheduler during multiplexing
  • Fig. 8 illustrates a UE
  • Fig. 9 illustrates an eNodeB
  • Fi. 10 illustrates an MME
  • Fig. 1 1 illustrates some procedural steps performed in an MME
  • Fig. 12 illustrates some procedural steps performed in a scheduler.
  • Fig. 1 schematically shows a wireless communication system 100.
  • the system 100 in Fig. 1 is an LTE network, but the invention can also be implemented is similar types of wireless communication systems.
  • Various network elements provide the functions and services for LTE radio bearers. This is shown in Fig.1 .
  • the MME 1 10 hosts the function of bearer 140 management functions including dedicated bearer 140 establishment.
  • the eNodeBs 120 are connected to the MME 1 10 by means of an S1 -MME interface.
  • the eNodeB 120 typically hosts the following functions for Radio Resource Management, which provides the service for radio bearers 150: Radio Bearer Control, Radio Admission Control, Connection Mobility Control, Dynamic allocation of resources to UE 130.
  • the UE 130 can, via the bearers 140 and the respective radio bearers 150 send and receive data from a Serving Gateway 105 of the system 100.
  • TTI transmission time interval
  • E-DCH enhanced dedicated channel
  • 3GPP release 8 HSPA specification 3GPP release 8 HSPA specification
  • TTI settings e.g. 2ms and 10ms
  • a TTI switch mechanism which is to dynamically select one TTI setting, is introduced for the E-DCH channel, see US2014001 6595, PCT/SE2014/050443, 3GPP TS25.212,
  • the multiplexing function in MAC layer performs multiplexing of data from several logical channels into one transport channel. If a UE could have different TTI lengths, based on the current LTE RLC/MAC sublayers, as shown in Fig. 2, the multiplexing in the MAC layer could always be executed according to a pre-defined multiplexing rule, e.g. multiplex the logical channel for short latency bearers to sTTI transport block (TB), and multiplex normal latency bearers to large TTI transport block (TB).
  • a UE might have different bearers between the network and the UE have different latency requirements. Therefore, a UE might
  • TTI time settings An adaptation of TTI to the bearer rather than to the UE could not only adapt to the channel variation, but also fit for different bearers' different
  • the existing TTI switch solutions for E-DCH set out above do not satisfy the requirements to allow for a per bearer setting of the TTI. This is because in High Speed Packet Access (HSPA) networks, one E- DCH is assigned for one UE.
  • the adaptation of the TTI for E-DCH is to decide one TTI setting during a period. In other words, for a fixed time period a UE can only have one TTI setting.
  • the MAC layer would execute pre-defined multiplexing policies which always multiplex specific bearers to specific TTI lengths, e.g. always multiplex the logical channel for short latency radio bearers to sTTI transport block, it can lose the flexibility and the transmission will not be efficient.
  • the multiplexing should allow for a UE and its different radio bearers to reallocate to different TTI settings even if the radio bearers were granted with one single TTI setting. For example, if a normal latency radio bearer was granted with a 10ms TTI, and in a case where there is only a small packet, e.g. padding, or if there is only sPDSCH with short TTI available in the scheduling slot, the normal latency radio bearer's packet could be multiplexed with other short latency bearers' data packet, to be fitted into a sPDSCH short length TTI.
  • the reallocation has the advantage that an efficient transmission is achieved.
  • the transmit block header and Cyclic Redundancy Check (CRC) overhead can be reduced.
  • the UE also can get the reallocation information, this could reduce UE processing.
  • ePDCCH enhanced PDCCH
  • a UE knows that reallocation is forbidden for a radio bearer when the bearer is on larger TTI (1 ms), in the 1 ms, the UE would only need to blind detect the PDCCH.
  • the UE can then be configured to not check the ePDCCH for each sTTI. This will save processing resources in the UE.
  • the wireless communication system can be configured to during a bearer setup, or a RRC connection, RRC reconfiguration or RRC reestablishment, to have a signal indicating whether it allows a radio bearer to reallocate to other TTIs or not.
  • This can be performed in different ways.
  • Either an MME or an eNodeB can provide the radio bearer reallocation signal to a UE.
  • the signal indicates whether the radio bearer(s) are allowed to reallocate to different TTIs.
  • the MAC (Medium Access Control) layer in the eNodeB is provided with this information to be able to determine how the multiplexing policy work for the different radio bearers.
  • a signal containing the TTI configuration for a bearer or group of bearers comprises data indicating whether a radio bearer is allowed to reallocate to a different TTI setting or not.
  • the signal is transmitted from the eNodeB.
  • the signal can be carried in RRC (Radio Resource Control) connection signals, e.g. RRC reconfiguration or RRC reestablishment and etc.
  • RRC Radio Resource Control
  • step 1 1 an event triggering a new TTI setting is received in the eNodeB.
  • events can be coming for RRC connection or RRC reestablishment for a UE, or RRC reconfiguration for new bearer(s) setup in step 1 1 .
  • the multiplexing policy in a step 12 determines whether the radio bearers could be reallocated to different TTIs or not. Then multiplexing is performed.
  • the new reallocation signal is added to RRC connection signal and sent to the UE in a step 13. This added signal does not have any impact on the
  • the following factors can for example be used in the multiplexing policy in step 12 to determine whether it allows bearer(s) reallocation to different TTIs.
  • the radio bearer's QoS Quality of Service
  • QoS Quality of Service
  • the signal can be sent from the eNodeB as a DCI (Downlink Control Information) on a PDCCH (Physical Downlink Control Channel). This is illustrated in Fig. 4.
  • DCI Downlink Control Information
  • PDCCH Physical Downlink Control Channel
  • events can be coming for RRC connection or RRC reestablishment for a UE, or RRC reconfiguration for new bearer(s) setup in step 16.
  • the multiplexing policy in a step 17 determines whether the radio bearers are to be reallocated to different TTIs or not. Then multiplexing is performed.
  • the new reallocation signal is added to a DCI signal on a PDCCH and sent to the UE in a step 18.
  • the signal can be contained in NAS (non- Access Stratum) signals, e.g. bearer setup and similar signaling.
  • a new bearer setup will result in that the eNodeB sends a RRC connection reconfiguration for this radio bearer.
  • the MAC layer in the eNodeB therefore gets the information in the signal for the specific radio bearer(s). Therefore, the multiplexing policy can determine whether the specific radio bearers could be reallocated to different TTIs or not. This is shown in Fig. 5.
  • an event such as a new bearer set up is received in the MME.
  • NAS signaling comprising the new bearer set up and a TTI configuration is sent from the MME to the eNodeB in a step 22.
  • the multiplexing policy in the eNodeB determines whether the radio bearers are to be reallocated to different TTIs or not. Then multiplexing is performed.
  • a signal indicating the TTI configuration is added to RRC connection signal and sent to the UE in a step 24.
  • the signal indicating the TTI configuration is added to step 22 and step 24, but it does not have any impact on the subsequent steps RRC_connection complete in a step 25 and bearer setup response in a step 26.
  • the signal carried in the RRC connection signals or NAS signals can comprise the following information: new TTI configuration for a radio bearer(s) or for a UE.
  • radio bearer(s) reallocation to different TTIs is allowed, or if all the bearers of a UE to be reallocated is allowed
  • the scheduler determines which multiplexing policy is to be used, i.e. whether the bearers could be reallocated to different TTIs or not.
  • the scheduler determines which multiplexing policy is to be used, i.e. whether the bearers could be reallocated to different TTIs or not.
  • the scheduler uses the multiplexing policy to
  • Fig. 7 illustrates the procedures performed by a scheduler for multiplexing the different bearers' PDU (Packet Data Unit) to TBs (transport blocks) when a PDU arrives.
  • PDU Packet Data Unit
  • TBs transport blocks
  • the multiplexing policy 701 is used in a step 703 to determine is a TB is allowed for the radio bearer. If yes, the procedure proceeds to a step 705. If the outcome is no in step 703, a pre-defined rule is used applied in a step 707 and the predefined TTI is used in a step 709.
  • step 705 it is checked if the received PDU fits in the TB. If the PDU fits in the TB, a reallocation to the TB is performed in a step 71 1 , else a new attempt is performed in a step 713.
  • reallocation is allowed for a radio bearer
  • the MAC-scheduler when the MAC-scheduler is multiplexing the radio bearer, it reallocates the radio bearer to a different TTI setting. If it is DL transmission, this reallocation is done by the eNodeB's scheduler, and if it is UL transmission, the reallocation is executed by the scheduler of the UE. The scheduler checks whether the transport block can carry the PDU or not, if the check result is YES, the PDU could be reallocate to the available transport block regardless whether its TTI length is large or short. If the policy determines the reallocation is not allowed for the radio bearer, the radio bearer's PDU could only be multiplexing with its pre-defined TTI length.
  • the scheduler can be implemented in the eNodeB or the UE.
  • a UE 130 is depicted.
  • the UE 130 comprises transceiver circuitry formed by a receiver 810 and a transmitter 830 for wireless communication with a wireless network.
  • the UE 130 further comprises a processor 840 that can use a memory 820.
  • the processor 840 can perform all the scheduling activities of the UE and is operatively connected to the receiver 810 and transmitter 830.
  • the eNodeB 120 comprises
  • the eNodeB 120 further comprises a processor 940 that can use a memory 920.
  • the processor 940 can perform all the scheduling activities of the eNodeB and is operatively connected to the receiver 910 and transmitter 930.
  • the eNodeB 120 can further comprise an input/output unit 950 for communication with other entities in a wireless communication network such as an MME 1 10.
  • the MME 1 10 comprises an input/output unit 1010 for communication with other entities of a network 100 such as an eNodeB.
  • the MME can comprise a processor 1040 connected to a memory 1020.
  • Fig. 1 some steps that can be performed in a Mobility Management Entity, MME adapted to be used in a wireless communication system are illustrated.
  • the wireless communication system is configured to allow multiple bearers and respective radio bearers between the wireless communication system and a user equipment UE.
  • the method comprises to receive in a step 41 bearer information of at least one bearer set up between a serving Gateway of the wireless communication system and the UE.
  • a radio bearer Transmission Time Interval, TTI reallocation configuration is determined for at least one radio bearer.
  • the TTI reallocation configuration is sent.
  • the TTI reallocation configuration can be sent towards a UE.
  • Fig. 12 some procedural steps of a method performed in a Scheduler 840, 940 of a UE 130 or an eNodeB 120 of a wireless communication system 100 is shown.
  • the wireless communication system is configured to allow multiple bearers 140 and respective radio bearers 150 between the wireless communication system and a user equipment, UE, 130.
  • the method comprises to receive in a step 51 a radio bearer Transmission Time Interval, TTI reallocation configuration and a bearer information for each bearer, or to receive in a step 52 a UE related TTI reallocation configuration and a UE reconfiguration information.
  • a reallocation of bearer data based on an available transport block resource for an at least one TTI and either the received radio bearer TTI reallocation configuration or the received UE related TTI reallocation configuration is determined.
  • Using the invention can result in different advantages. For example, it can allow the adaptation of TTI size to the radio bearer level, which can not only adapt to the channel variation, but also fit for different radio bearers' requirement. Also, it can allow the bearer's data reallocating to different TTI settings. With the TTI configuration signal the MAC multiplexing and scheduling can adapt to a per bearer's requirement in different scenarios. The solution can be used in other systems other than LTE if multiple TTI settings for a UE are allowed.

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

Abstract

L'invention concerne un ordonnanceur adapté pour un système de communication sans fil (100). Le système de communication sans fil est configuré pour permettre de multiples porteuses (140) et des porteuses radio respectives (150) entre le système de communication sans fil et un équipement utilisateur, UE (130). L'ordonnanceur est conçu pour recevoir un intervalle de temps de transmission (TTI) de porteuse radio, une configuration de réattribution de TTI et des informations de support pour la porteuse radio respective, ou pour recevoir une configuration de réattribution de TTI associée à un UE et des informations de reconfiguration d'UE. L'ordonnanceur est en outre conçu pour déterminer une réattribution de données de support sur la base d'une ressource de bloc de transport disponible pour au moins un intervalle de temps de transmission, TTI, et soit la configuration de réattribution de TTI de porteuse radio reçue, soit la configuration de réattribution de TTI associée à l'UE reçue. L'invention concerne en outre des procédés et des dispositifs permettant à l'ordonnanceur de fonctionner efficacement.
PCT/EP2016/081959 2016-12-20 2016-12-20 Système de communication sans fil ayant de multiple porteuses radio WO2018113928A1 (fr)

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Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
ERICSSON: "Impacts on the UL grant and LCP of different numerologies and flexible TTI", vol. RAN WG2, no. Reno, Nevada, USA; 20161114 - 20161118, 13 November 2016 (2016-11-13), XP051178215, Retrieved from the Internet <URL:http://www.3gpp.org/ftp/Meetings_3GPP_SYNC/RAN2/Docs/> [retrieved on 20161113] *
HUAWEI HISILICON: "Aggregation over Multiple Numerologies", vol. RAN WG2, no. Reno, Nevada, USA; 20161114 - 20161118, 13 November 2016 (2016-11-13), XP051177441, Retrieved from the Internet <URL:http://www.3gpp.org/ftp/Meetings_3GPP_SYNC/RAN2/Docs/> [retrieved on 20161113] *
LG ELECTRONICS INC: "Support of flexible TTI in NR", vol. RAN WG2, no. Gothenburg, Sweden; 20160822 - 20160826, 21 August 2016 (2016-08-21), XP051141013, Retrieved from the Internet <URL:http://www.3gpp.org/ftp/Meetings_3GPP_SYNC/RAN2/Docs/> [retrieved on 20160821] *
PANASONIC: "Uplink scheduling procedure when supporting multiple numerologies", vol. RAN WG2, no. Reno, Nevada; 20161114 - 20161118, 13 November 2016 (2016-11-13), XP051177573, Retrieved from the Internet <URL:http://www.3gpp.org/ftp/Meetings_3GPP_SYNC/RAN2/Docs/> [retrieved on 20161113] *

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