WO2014162003A1 - Procédé et appareil servant à établir des priorités d'ordonnancement de liaison montante dans un réseau d'accès radio (ran) - Google Patents

Procédé et appareil servant à établir des priorités d'ordonnancement de liaison montante dans un réseau d'accès radio (ran) Download PDF

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Publication number
WO2014162003A1
WO2014162003A1 PCT/EP2014/056868 EP2014056868W WO2014162003A1 WO 2014162003 A1 WO2014162003 A1 WO 2014162003A1 EP 2014056868 W EP2014056868 W EP 2014056868W WO 2014162003 A1 WO2014162003 A1 WO 2014162003A1
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Prior art keywords
mobile terminal
uplink
traffic
buffer
base station
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PCT/EP2014/056868
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English (en)
Inventor
Athul Prasad
Andreas Maeder
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NEC Europe Ltd
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NEC Europe Ltd
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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

Definitions

  • the present invention relates to a method of uplink scheduling in a radio access network (RAN), wherein buffer status reports of radio bearers of a mobile terminal are communicated to a base station, wherein said base station performs scheduling of said mobile terminal in the uplink based on information contained in the buffer status reports received from said mobile terminal.
  • RAN radio access network
  • the present invention relates to an apparatus for use in uplink scheduling in a radio access network (RAN), comprising a base station radio resource scheduler for receiving from a mobile terminal buffer status reports of radio bearers of said mobile terminal and for performing scheduling of said mobile terminal in the uplink based on information contained in the buffer status reports received from said mobile terminal.
  • RAN radio access network
  • Congestion in the uplink can occur due to heavy user traffic in the uplink direction, resulting from various reasons such as a significant number of users being engaged in sending of TCP ACKs resulting from downlink traffic, due to allocating uplink resources for downlink in flexible TDD (as described, e.g., in Y. Wang et al., "Performance Evaluation of Flexible TDD Switching in 3GPP LTE System," IEEE SARNOFF, May 2012), or due to a significant number of users being engaged in using applications which utilize substantial amount of uplink resources such as video telephony.
  • OTT over-the-top
  • eNodeB evolved NodeB
  • eNB evolved NodeB
  • eNodeB-Advanced 3GPP LTE-Advanced systems
  • there are currently only means available to prioritize uplink traffic for operator-controlled traffic on dedicated bearers for reference, see 3GPP 36.321 , "E-UTRA: Medium Access Control (MAC) protocol specification," Version 1 1.1.0, January 2013).
  • MAC Medium Access Control
  • Scheduling in the uplink is controlled by the RAN in order to enable flexible and dynamic utilization of radio resources.
  • a User Equipment In order to transmit on the UL-SCH (uplink shared channel), a User Equipment (UE) must have a valid UL grant. This means that the address of resource blocks in the physical layer for the UE to transmit data are signaled to the UE either via the physical downlink control channel (PDCCH)jn a Random Access Response, or configured semi-persistently (for voice traffic).
  • PDCCH physical downlink control channel
  • UEs use Scheduling Requests (SR) to request UL-SCH resources for transmission.
  • SR Scheduling Requests
  • BSR Buffer Status Reporting
  • This also ensures that radio resources are not wasted. Buffer status reporting for delay constrained flows or radio bearers are considered in Pradap K.V. et al., "Uplink Buffer Status Reporting for Delay Constrained Flows in 3GPP Long Term Evolution," IEEE WCNC, April 2009.
  • a prioritization of radio bearers is done by grouping radio bearers having same priority into Radio Bearer Group (RBG) or Logical Channel Group (LCG), and BSRs are sent along with LCG IDs so that RAN is aware of high priority traffic in UE buffers of radio bearers that belong to an RBG having assigned a high priority.
  • RBG Radio Bearer Group
  • LCG Logical Channel Group
  • Fig. 1 illustrates uplink channel mapping of logical channels into transport channels, as defined in 3GPP 36.321 , "E-UTRA: Medium Access Control (MAC) protocol specification," Version 1 1.1.0, January 2013.
  • E-UTRA Medium Access Control
  • MAC Medium Access Control
  • CCCH Common Control Channel
  • DCCH Dedicated Control Channel
  • DTCH Dedicated Traffic Channel
  • Default bearer contains traffic such as TCP ACKs which are considered to be important from network operators' point-of-view, whereas traffic due to OTT services, such as peer-to-peer file transfers, etc. might be considered less important.
  • techniques are required for prioritization of traffic classified as important in the default bearer (which can be generalized to any RBG/LCG) while scheduling UL resources. Considerations as the ones disclosed in 7,724,656 B2 aim to lower allocation of UL resources to mitigate congestion, but do not take into account the priority of traffic which needs to be transmitted even during congestion.
  • RAN radio access network
  • an apparatus comprising the features of claim 9.
  • said base station radio resource scheduler is configured to adapt the scheduling of said mobile terminal's uplink default bearer by allocating uplink resources to said mobile terminal based on information on high priority traffic contained said mobile terminal's uplink default bearer buffer, which said mobile terminal included in said mobile terminal's buffer status reports.
  • the invention it has first been recognized that current state-of-the-art cannot mitigate user plane congestion, especially on default bearer. It has further been recognized that the above objective can be solved by sending priority related information to the base station about buffer occupancy of default bearer traffic.
  • the priority related information may include information on traffic classified by the mobile terminal as high priority traffic, where high priority traffic generally denotes traffic that has to be transported even in case of network congestion.
  • the method according to the present invention which provides a method for uplink scheduling prioritization of default bearer congestion mitigation, enables adaptation of the scheduling of the uplink default bearer according to the traffic which needs to be transported. Dedicated bearers cannot be used for this purpose, since this would mean an end-to-end EPS (Evolved Packet System) bearer have to be setup, which causes significant overhead.
  • EPS Evolved Packet System
  • the present invention enhances UL resource availability to UEs without affecting the base station and eNB scheduler flexibility. It enables base stations to have better control over the network performance, especially during congestion. As a result, by applying method according to embodiments of the present invention better resource prioritization and hence utilization is achieved. As a further advantage, the present invention enables operators to define congestion mitigation techniques at the eNB with limited impact on currently defined standards. Finally, in a network using flexible TDD, based on modified BSR in accordance with embodiments of the invention, eNB can decide the flexible switching point more efficiently, leading to better utilization of physical resources.
  • the mobile terminal may perform a binary level classification of traffic contained in its uplink default bearer buffer, for instance, by dividing the traffic contained in the uplink default bearer buffer and to high priority traffic on the one hand and into low priority traffic on the other hand.
  • the mobile terminal performs a classification of buffer occupancy on a more fine grained level, i.e. by assigning traffic contained the uplink default bearer buffer a number of three or more different priority levels.
  • the classification may be performed by using service differentiated buffer occupancy criteria together with associated priority IDs. This would bring service differentiation function to the base station or, more specifically, to the base station radio resource scheduler, giving the base station radio resource scheduler more flexibility in scheduling.
  • the mobile terminal may classify traffic contained in its uplink default bearer buffer as high priority traffic based on service class identifier (SCI) information obtained from downlink traffic.
  • SCI service class identifier
  • the mobile terminal may inform the base station of the employed format of the buffer status reports.
  • the mobile terminal may transmit the modified buffer status reports by either using a modified long BSR format or by using a modified short BSR format, based on the BSR format definitions as specified in 3GPP 36.321 , "E-UTRA: Medium Access Control (MAC) protocol specification," Version 1 1.1.0, January 2013 (see section 6.1.3 "MAC Control Elements", which is incorporated herein by way of reference).
  • the mobile terminal may send a message (that contains information regarding the employed BSR format) to the base station in RRCReconfiguration (Radio Resource Control). Upon receiving this information, the base station understands which format of BSR to expect from the mobile terminal.
  • RRCReconfiguration Radio Resource Control
  • a field indicating the size of high priority traffic contained in the mobile terminal's uplink default bearer buffer is added to the buffer status report.
  • the base station is informed of the amount of UL resources that the mobile terminal really needs on the default bearer during congestion situation. For instance, this report could be realized by adding another octet to the buffer status reports as currently defined in the above quoted 3GPP document.
  • buffer status reports would defined in such a way that high priority UL traffic is sent without significant delays, while de-prioritizing low-priority traffic.
  • a field indicating a priority ID of the high priority traffic contained in the mobile terminal's uplink default bearer buffer is added to the buffer status report. This would give additional information to the base station or, more specifically, to the base station radio resource scheduler regarding the type of traffic the mobile terminal has classified as high priority traffic.
  • the base station may transmit a corresponding configuration message to the mobile terminal in order to advise the mobile terminal accordingly.
  • Fig. 1 is a schematic view illustrating uplink channel mapping according to 3GPP specifications
  • Fig. 2 is a schematic view illustrating the short BSR format according to 3GPP specifications
  • Fig. 3 is a schematic view illustrating the long BSR format according to 3GPP specifications
  • Fig. 4 is a schematic view illustrating a scenario of BSR reporting and traffic handling according to prior art
  • Fig. 5 is a flow diagram illustrating the reporting of modified BSR information in accordance with a first embodiment of the invention
  • Fig. 6 is a schematic view illustrating a modified BSR reporting format in accordance with an embodiment of the invention
  • Fig. 7 is a schematic view illustrating a modified BSR reporting format in accordance with another embodiment of the invention.
  • Fig. 8 is a diagram illustrating uplink scheduling based on traffic prioritization using service class identifiers (SCI) in accordance with an embodiment of the invention
  • Figs. 2 and 3 illustrate buffer status reporting (BSR) formats, as specified according to current standards (see 3GPP 36.321 , "E-UTRA: Medium Access Control (MAC) protocol specification," Version 1 1.1.0, January 2013, subsection 6.1.3 "MAC Control Elements”).
  • BSR buffer status reporting
  • MAC Medium Access Control
  • MAC Control Elements MAC Control Elements
  • each radio bearer is mapped to one of four defined RGBs (#0 - #3) based on its QoS.
  • Each RBG is identified by a RBG Identifier (RGB ID). Based on these specifications, Fig.
  • the long BSR format which is illustrated in Fig. 3 and which is sent if multiple RBG/LCGs have data in the UE buffer, consists of four buffer size fields, each of which corresponding to a respective LCG (LCG IDs 0-3).
  • these standardized BSR formats may form the basis for designing modified BSRs that include information on high priority traffic contained in a mobile terminal's uplink default bearer buffer in accordance with the invention.
  • Fig. 4 depicts an LTE network architecture comprising a radio access network (RAN) in which a mobile terminal - UE 1 - is connected to a base station - eNodeB 2. As illustrated in Fig. 4, it is assumed that UE 1 is running various applications.
  • RAN radio access network
  • the traffic of IP applications like YouTube Video, TCP ACKs, Web service requests, Facetime Data upload, etc.
  • IP applications like YouTube Video, TCP ACKs, Web service requests, Facetime Data upload, etc.
  • the traffic belonging to non-IP applications is scheduled in the buffers of dedicated radio bearers established by UE 1.
  • UE 1 since multiple RBG/LCGs have data in the buffer, UE 1 employs the long BSR format to report buffer size information (i.e. the amount of data available in the buffers) to eNodeB 2.
  • buffer size information i.e. the amount of data available in the buffers
  • this BSR procedure is indicated by the solid line arrows denoted "Default RBG BSR#0" (indicating the RBG to which UE's 1 default bearer belongs to) and "Dedicated RBG BSR#1 -3". Based on this information, eNodeB 2 grants the UE 1 uplink resources for transmission via the UL-SCH.
  • UE 1 buffers are occupied by different types of traffic and, in particular, within the default bearer buffer there could be traffic with different levels of priority.
  • this cannot be informed to the eNB 2.
  • UE 1 cannot be allocated with proper amount of uplink resources since the eNB 2 scheduler is unaware of the high priority traffic information contained in the default RBG buffer.
  • Fig. 4 like the cellular protocol stack or GPRS tunneling protocol (GTP) performed by eNodeB 2) are not of particular importance with respect to the present invention. Apart from this it is assumed that those skilled in the art are sufficiently familiar with these aspects, such that a detailed description thereof can be omitted here.
  • GTP GPRS tunneling protocol
  • FIG. 5 this figure illustrates a flow diagram for reporting modified BSR information in accordance with a first embodiment of the present invention.
  • the UE 1 informs the eNB 2 about sending modified BSR information for default bearer when there is significant amount of high priority traffic in the default bearer which could not be sent within particular time duration.
  • UE 1 detects that it has a significant amount of high priority traffic in its default RBG queue.
  • the trigger for initiating the modified BSR reporting according to the invention could be based, e.g., on the relative occupancy of UE's 1 default bearer buffer. For instance, in case more than, e.g., 50% of the default bearer buffer is occupied by high priority traffic for a certain amount of time (e.g. for a few seconds) modified BSR reporting will be initiated. Otherwise, indicated at 502, UE 1 would proceed with normal 3GPP LTE Release- 10 operation, as described in connection with Fig. 4.
  • high priority traffic denotes traffic that has to be sent despite of any congestion situations.
  • high priority traffic may contain packets with a certain short lifetime or time to expiry, which will be dropped at the Radio Link Control (RLC) layer when not being served within their lifetime or time to expiry, resulting in poor user experience at the UE 1.
  • RLC Radio Link Control
  • UE 1 If the modified BSR reporting is initiated, at 503, a check is performed whether traffic is available only on the UE's 1 default bearer. Depending on buffer occupancy of various RBGs, UE 1 signals (at 504 and 505, respectively) whether it is sending new BSR format in short or long form. For instance, this information may be sent in a RRCReconfiguration message.
  • the UE 1 sends the modified BSR, i.e. BSR with high priority traffic information, to the eNB 2.
  • the eNB 2 scheduler will be aware of the resources UE needs to send the high priority traffic in its buffer, as indicated at 507, and schedules UL resources for the UE accordingly (step 508).
  • the logical channel configurations may be sent in the LogicalChannelConfig information element (IE), as defined in 3GPP 36.331 , "E-UTRA: Radio Resource Control (RRC) protocol specification," Ver 1 1.2.0, January 2013 , subsection 6.3.2, which is incorporated herein by way of reference.
  • IE LogicalChannelConfig information element
  • UE 1 and eNB 2 are aware of which logical channel group or radio bearer group each logical channel belongs to.
  • extendedBSR-Sizes-r10 parameter in MAC-MainConfig IE also defined in the above quoted specification, eNB 2 can interpret whether UE 1 is going to send long or short BSR format.
  • RadioResourceConfigDedicated parameter From RadioResourceConfigDedicated parameter, the mapping between DRB-ID of default RB and logical channel ID (logicalChannelldentity) can be mapped.
  • One possible implementation for informing the eNB about sending default RB BSR in a format modified in accordance with the present invention is to add a new parameter called highPriorityTrafficlndicator in RadioResourceConfigDedicated which could be optional or set to ⁇ ' by default.
  • ⁇ ' When the parameter is set to ⁇ ', eNB 2 will be aware of UE 1 sending BSR for default RBG in the modified format.
  • Fig. 6 this figure illustrates a new BSR reporting format modified in accordance with an embodiment of the present invention.
  • the eNB 2 informs the UE 1 to send BSR in an RRCConnectionReconfiguration message.
  • UE 1 performs the same BSR selection procedure (comprising steps 602-604) as described in connection with Fig. 5 (corresponding to steps 503-505).
  • steps 602-604 as described in connection with Fig. 5 (corresponding to steps 503-505).
  • octet is added to the respective standard format (Octet 2 in case of the Short BSR format and Octet 4 in case of the Long BSR format) in order to indicate the size of high- priority information contained in the UE's 1 uplink default bearer buffer.
  • the buffer size levels indicated by the new field could be chosen to be similar to the currently defined buffer size levels for BSR, as specified in 3GPP 36.321 , "E-UTRA: Medium Access Control (MAC) protocol specification," Version 1 1.1.0, January 2013.
  • Fig. 7 shows another possible implementation of a BSR reporting format modified in accordance with an embodiment of the present invention.
  • the priority ID of the high priority traffic is informed to the eNB 2.
  • the added octet (Octet 2 and Octet 4, respectively) are subdivided in two fields, where the first field contains the Priority ID, while the second field contains the size of high priority traffic.
  • Fig. 8 is a diagram showing uplink scheduling based on traffic prioritization using service class identifiers (SCI) in accordance with an embodiment of the invention. More specifically, Fig. 8 illustrates the inter-working of BSR reporting modified in accordance with the invention on the one hand with SCI based enhancement in DL traffic on the other end.
  • SCI service class identifiers
  • the eNB 2 sends SCI or any other related information, which indicates the traffic priority or QoS-related characteristics, in the default bearer to the UE 1 along with the data packets.
  • UE 1 receives and deciphers the SCI information and prioritizes the UL traffic at the UE 1 based on the SCI information obtained from downlink traffic. In other words, the UE 1 prioritizes UL traffic in the same way as DL traffic is being prioritized, based on information conveyed from the core network.
  • UE 1 can use the deciphered SCI information to form the priority ID while reporting buffer occupancy in UL so that eNB 2 can have additional information regarding the class of traffic occupying the queue and schedule downlink resource blocks accordingly.
  • UE 1 informs eNB 2 about sending buffer status in modified BSR format and, in step 807, UE 1 sends the BSR in modified format.

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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 procédé d'ordonnancement de liaison montante dans un réseau d'accès radio (RAN), les rapports d'état de tampon des porteuses radio d'un terminal mobile étant communiqués à une station de base, ladite station de base réalisant l'ordonnancement dudit terminal mobile dans la liaison montante sur la base des informations contenues dans les rapports d'état de tampon reçus dudit terminal mobile. Le procédé ci-décrit est caractérisé par les étapes consistant, au niveau du terminal mobile, à classer le trafic contenu dans ledit tampon de porteuse par défaut de liaison montante de terminal mobile comme étant du trafic haute priorité et à inclure des informations sur ledit trafic haute priorité dans lesdits rapports d'état de tampon de terminal mobile communiqués à ladite station de base et, au niveau de ladite station de base, à adapter l'ordonnancement de ladite porteuse par défaut de liaison montante de terminal mobile en attribuant des ressources de liaison montante audit terminal mobile sur la base des informations sur ledit trafic haute priorité contenu dans les rapports d'état de tampon reçus dudit terminal mobile. L'invention concerne également un appareil correspondant utilisé dans l'ordonnancement de liaison montante dans un RAN.
PCT/EP2014/056868 2013-04-04 2014-04-04 Procédé et appareil servant à établir des priorités d'ordonnancement de liaison montante dans un réseau d'accès radio (ran) Ceased WO2014162003A1 (fr)

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EP13162369.6 2013-04-04

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017142356A1 (fr) * 2016-02-18 2017-08-24 엘지전자 주식회사 Procédé pour réaliser une transmission en liaison montante dans un système de réseau local (lan) sans fil et terminal l'utilisant
EP3503643A4 (fr) * 2016-09-27 2019-07-24 Huawei Technologies Co., Ltd. Procédé et dispositif de rapport pour rapport d'état de tampon
WO2020146976A1 (fr) * 2019-01-14 2020-07-23 Lenovo (Beijing) Limited Appareil et procédé de communication avec rapport d'état de tampon
WO2023087254A1 (fr) * 2021-11-19 2023-05-25 Lenovo (Beijing) Limited Procédé et appareil de communication sans fil

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EP2557882A1 (fr) * 2011-08-10 2013-02-13 MIMOON GmbH Procédé et appareil de planification de flux optimisé

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US20120307783A1 (en) * 2006-06-21 2012-12-06 Torsner Per Johan Method and unit for efficient reporting of scheduling information in a wireless telecommunications system
EP2557882A1 (fr) * 2011-08-10 2013-02-13 MIMOON GmbH Procédé et appareil de planification de flux optimisé

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017142356A1 (fr) * 2016-02-18 2017-08-24 엘지전자 주식회사 Procédé pour réaliser une transmission en liaison montante dans un système de réseau local (lan) sans fil et terminal l'utilisant
US11190972B2 (en) 2016-02-18 2021-11-30 Lg Electronics Inc. Method for performing uplink transmission in wireless LAN system and terminal using same
EP3503643A4 (fr) * 2016-09-27 2019-07-24 Huawei Technologies Co., Ltd. Procédé et dispositif de rapport pour rapport d'état de tampon
US11153778B2 (en) 2016-09-27 2021-10-19 Huawei Technologies Co., Ltd. Buffer status report reporting method and apparatus
WO2020146976A1 (fr) * 2019-01-14 2020-07-23 Lenovo (Beijing) Limited Appareil et procédé de communication avec rapport d'état de tampon
US12250586B2 (en) 2019-01-14 2025-03-11 Lenovo (Beijing) Limited Apparatus and method for communication with buffer status report
WO2023087254A1 (fr) * 2021-11-19 2023-05-25 Lenovo (Beijing) Limited Procédé et appareil de communication sans fil

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