WO2013067677A1 - Procédés, dispositifs et produits programmes d'ordinateur pour une transmission de demandes d'ordonnancement améliorée afin d'accroître l'efficacité des ressources - Google Patents

Procédés, dispositifs et produits programmes d'ordinateur pour une transmission de demandes d'ordonnancement améliorée afin d'accroître l'efficacité des ressources Download PDF

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Publication number
WO2013067677A1
WO2013067677A1 PCT/CN2011/081884 CN2011081884W WO2013067677A1 WO 2013067677 A1 WO2013067677 A1 WO 2013067677A1 CN 2011081884 W CN2011081884 W CN 2011081884W WO 2013067677 A1 WO2013067677 A1 WO 2013067677A1
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WIPO (PCT)
Prior art keywords
scheduling request
configuration parameter
base
computer program
processor
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PCT/CN2011/081884
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English (en)
Inventor
Chunyan Gao
Jing HAN
Wei Bai
Haiming Wang
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Renesas Mobile Corporation
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Publication date
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Priority to PCT/CN2011/081884 priority Critical patent/WO2013067677A1/fr
Publication of WO2013067677A1 publication Critical patent/WO2013067677A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H04W72/1221—Wireless traffic scheduling based on age of data to be sent
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H04L47/30—Flow control; Congestion control in combination with information about buffer occupancy at either end or at transit nodes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/002—Transmission of channel access control information
    • H04W74/008—Transmission of channel access control information with additional processing of random access related information at receiving side

Definitions

  • the present invention relates to methods, devices and computer program products for enhanced scheduling request transmission to improve resource efficiency.
  • Embodiments of the invention relate to LTE-Advanced system, which will be part of 3GPP LTE Rel-11. More specifically, it is focused on small data transmission, as applied for example in MTC (Machine Type Communication) and enhanced diverse data transmission topics in LTE-Advanced system.
  • MTC Machine Type Communication
  • a objective to achieve small data transmissions is to provide more efficient management of system resources (e.g . UL control channel resources) for connected mode UEs that are temporarily inactive, facilitating potentially larger user populations in connected mode.
  • system resources e.g . UL control channel resources
  • MTC Machine Type Communication
  • M2M Machine to Machine
  • RAN overload should be avoided in order to avoiding to protect normal legacy UEs and RAN efficiency should be improved when huge number of MTC devices are accessed.
  • Small data transmission is one of defined features of MTC, and this is also one of prioritized features/requirements.
  • another feature of the traffic is that it is intermitted, i.e., there can be large time interval between two transmissions. It has been shown that in such a case, reserved UL control resource, e.g ., SR resource and CQI resource for such UEs can be a waste.
  • the SR resource is configured by assigning a period and one subframe offset, and this is determined by the RRC parameter sr-Configlndex.
  • the period can be 1ms, 2ms, 5ms, 10ms, 20ms, 40ms or 80ms as shown in table 1 below (representing table 10.1.5- 1 from TR 36.213 V10.3.0 (2011-09)).
  • Table 1 UE-specific SR periodicity and subframe offset configuration
  • the SR period can be set large. However, even with large SR period, e.g ., 80ms, the usage rate of SR is still low for some traffic type.
  • the Scheduling Request is used for requesting UL-SCH resources for new transmission, then it means, for some traffic type, where the packet is very small and the traffic arrives discontinuously, the SR is required each time the data arrives.
  • the SR is required each time the data arrives.
  • RACH will be triggered to send the request.
  • the packet is small, such requests can be seen as very inefficient.
  • the RACH will be overloaded.
  • the present invention addresses such situation and proposes in exemplary embodiments, new solutions for enhancement of SR transmissions to improve the resource efficiency.
  • a base period for sending scheduling requests to a network control element is determined based on a base scheduling request configuration parameter, and a final period for sending the scheduling requests is determined based on the base period and an additional scheduling request configuration parameter.
  • an amount of data in a buffer for data transmission is checked, and triggering of a scheduling request is restricted until the amount of data in the buffer for data transmission exceeds a predetermined threshold.
  • discontinuing reception is performed, wherein a cycle for discontinuing reception is defined, the cycle including an inactive time and an active time, and transmission of scheduling requests is restricted based on the cycle for discontinuing reception.
  • transmission of scheduling requests is restricted in certain conditions.
  • SR transmissions are enhanced, so that the resource efficiency improved.
  • proposed solutions also enable UE power saving.
  • Fig . 1 schematically illustrates a UE according to a first embodiment of the present invention
  • Fig . 2 shows a flow chart of a process performed by the UE according to the first embodiment
  • Fig . 3 shows a flow chart of a further process performed by the UE according to the first embodiment
  • Fig . 4 schematically illustrates a eNB according to the first embodiment of the present invention
  • Fig . 5 shows a flow chart of a process performed by the eNB according to the first embodiment
  • Fig . 6 schematically illustrates a UE according to a second embodiment of the present invention
  • Fig . 7 shows a flow chart of a process performed by the UE according to the second embodiment
  • Fig . 8 schematically illustrates a eNB according to the second embodiment of the present invention
  • Fig . 9 shows a flow chart of a process performed by the eNB according to the second embodiment
  • Fig . 10 schematically illustrates a UE according to a third embodiment of the present invention
  • Fig . 11 shows a flow chart of a process performed by the UE according to the third embodiment
  • Figs. 12 to 14 shows some example for the relationship between a DRX cycle and SR transmission according to the third embodiment.
  • Fig . 1 illustrates a simplified block diagram of a user equipment (UE) 1 according to an embodiment of the present invention. It is noted that the UE, and the corresponding apparatus according to the embodiment may consist only of parts of the UE, so that the apparatus may be installed in an UE, for example. Moreover, also the UE is only an example and may be replaced by another suitable network element.
  • UE user equipment
  • the UE 1 comprises a processor 11 and a memory 12.
  • the memory comprises a computer program, wherein the memory 12 and the computer program are configured to, with the processor, cause the apparatus to perform several operations as described below by referring to Fig. 2.
  • the UE 1 may also comprise an interface 13 for providing connections to other network elements.
  • the processor 11, the memory 12 and the interface 13 may be interconnected by a suitable connection 14, e.g ., a bus or the like.
  • the apparatus may comprise more than one processor, more than one memory and/or more than one interface, if this is suitable for a particular structure.
  • Fig . 2 shows a flow chart for describing the basic operations according to the first embodiment, which may be performed by the UE 1 shown in Fig 1.
  • a base period for sending scheduling requests to a network control element based on a base scheduling request configuration parameter is determined in step S21 .
  • a final period for sending the scheduling requests based on the base period and an additional scheduling request configuration parameter is determined in step S22 . That is, the base period for the scheduling requests (SR) (such as the SR periodicity described above in connection with table 1) is determined according to a base scheduling request (SR) configuration parameter such as the SR configuration index I SR described above in connection with table 1. Based on this base period and a new additional scheduling request configuration parameter, a final period is determined .
  • SR scheduling request
  • a scheduling request subframe offset may be determined based on the additional scheduling request configuration parameter, as shown in the flow chart of Fig . 3.
  • a base scheduling request subframe offset based on the base scheduling request configuration parameter
  • a final scheduling request subframe offset is determined based on the base scheduling request subframe offset and the additional scheduling request configuration parameter.
  • the SR period is extended by introducing one new parameter, which may be defined as ⁇ .
  • the period of SR transmission and the subframe offset can be determined as following :
  • N'_offset (P_offset)*P+N_offset, where N_offset is the original offset derived from I SR (i .e., the original offset as indicated as "SR subframe offset” or "N 0F FSET,SR” in table 1).
  • N and P_offset are determined by the parameter ⁇ , e.g ., based on the following table 2 :
  • the base scheduling request configuration parameter (e.g . ISR described above may be defined for a plurality of apparatuses (UEs) in common, and the additional scheduling request configuration parameter (e.g ., the parameter ⁇ described above) may defined for each apparatus individually.
  • one SR resource with current configuration i .e., based on the SR configuration index I S R only
  • the configuration can be effected by an eNB, for example, or by another suitable network control element as shown in Figs. 4 and 5.
  • Fig . 4 shows an eNB 5 as an example for an apparatus which carries out the SR configuration .
  • the eNB 4 according to this embodiment comprises a processor 41 and a memory 42.
  • the memory comprises a computer program, wherein the memory 42 and the computer program are configured to, with the processor, cause the apparatus to perform several operations as described below by referring to Fig . 5.
  • the eNB 4 may also comprise an interface 43 for providing connections to other network elements.
  • the processor 41, the memory 42 and the interface 43 may be inter-connected by a suitable connection 44, e.g ., a bus or the like.
  • the apparatus may comprise more than one processor, more than one memory and/or more than one interface, if this is suitable for a particular structure.
  • Fig . 5 shows a flow chart for describing the basic operations according to the first embodiment for the SR configuration, which may be performed by the eNB 4 shown in Fig 4.
  • the base scheduling request configuration parameter e.g ., SR configuration index I SR
  • the additional scheduling request configuration parameter e.g ., ⁇
  • ⁇ ' the final period for sending the scheduling request based on the base period and the additional scheduling request configuration parameter ( ) .
  • the eNB 4 may define ISR for a plurality of network elements (e.g ., UEs) in common, but ⁇ individually for each network element.
  • network elements e.g ., UEs
  • This proposal allows a very flexible SR period configuration, which can be a multiple of any current period .
  • the period be multiple of current setting, one SR resource with current configuration can be shared by multiple new UEs.
  • the proposal according to the first embodiment can be easily introduced, since the existing mechanism uses the parameter I SR , which is still used according to the first embodiment, and only an additional parameter is defined . That is, UEs, which support the new feature, can be configured with the new parameter, while the UEs, which do not support this feature, can be configured without this new parameter. Since the configuration is UE-specific, no compatibility problem will occur. Hence, the introduction of the new feature does not have an impact on legacy UEs.
  • the base scheduling request configuration parameter e.g ., SR configuration index I SR
  • additional scheduling request configuration parameter e.g ., ⁇
  • the invention is not limited to this, and only the SR period may be determined on the two parameters (I SR and ⁇ ) . That is, alternatively, no subframe offset may be applied, or a subframe offset may be set independently from the SR period .
  • a second embodiment is described by referring to Figs. 6 to 9. According to the second embodiment, a restriction for SR transmission is introduced . Fig .
  • FIG. 6 illustrates a simplified block diagram of a user equipment (UE) 1 according to the second embodiment of the present invention.
  • UE user equipment
  • the corresponding apparatus according to the embodiment may consist only of parts of the UE, so that the apparatus may be installed in an UE, for example.
  • the UE is only an example and may be replaced by another suitable network element.
  • the UE 6 comprises a processor 61 and a memory 62.
  • the memory comprises a computer program, wherein the memory 62 and the computer program are configured to, with the processor, cause the apparatus to perform several operations as described below by referring to Fig . 7.
  • the UE 6 also comprises a buffer 65 for data transmission, as will be explained in the following.
  • the buffer 65 may be a separate element or may actually also be part of the processor 61, for example.
  • the UE 6 may also comprise an interface 63 for providing connections to other network elements.
  • the processor 61, the memory 62 and the interface 63 may be inter-connected by a suitable connection 64, e.g., a bus or the like.
  • the apparatus may comprise more than one processor, more than one memory and/or more than one interface, if this is suitable for a particular structure.
  • Fig . 7 shows a flow chart for describing the basic operations according to the first embodiment, which may be performed by the UE 6 shown in Fig 6.
  • the amount of data in the buffer for data transmission is checked, and triggering of a scheduling request is restricted until the amount of data in the buffer for data transmission exceeds a predetermined threshold .
  • the data amount A in the buffer 65 is obtained.
  • the obtained data amount A is compared with a threshold Tl . If the data amount A is lower than the threshold Tl, the process proceeds to step S73, and triggering of SR is restricted.
  • step S72 if the data amount A is higher than the threshold Tl in step S72, then the process proceeds to step S74, and triggering of SR is allowed.
  • the value for Tl should be configured considering the delay requirement of the traffic, or, the threshold rule is applied only when the delay timer is not expired.
  • a restriction for the SR transmission is introduced, namely such that , e.g., only if the BSR (buffer status report, as an example for the data amount A in the buffer mentioned above) is larger than a threshold (e.g., Tl described above), UE should trigger SR.
  • a threshold e.g., Tl described above
  • the above-described scheme may only be used for a specific identity to which the data is to be transmitted .
  • the scheme may only be applied for some pre-configured or just fixed LCID (Logical Channel ID), e.g., the logical channel without strict delay requirement.
  • LCID Logical Channel ID
  • triggering of a scheduling request may only be allowed when the amount of data A in the buffer for data transmission exceeds the predetermined threshold Tl and when no uplink grant is available.
  • the configuration can be effected by an eNB, for example, or by another suitable network control element as shown in Figs. 4 and 5.
  • Fig . 8 shows an eNB 8 as an example for an apparatus which carries out the SR configuration.
  • the eNB 8 according to this embodiment comprises a processor 81 and a memory 82.
  • the memory comprises a computer program, wherein the memory 82 and the computer program are configured to, with the processor, cause the apparatus to perform several operations as described below by referring to Fig . 9.
  • the eNB 8 may also comprise an interface 83 for providing connections to other network elements.
  • the processor 81, the memory 82 and the interface 83 may be inter-connected by a suitable connection 84, e.g., a bus or the like.
  • the apparatus may comprise more than one processor, more than one memory and/or more than one interface, if this is suitable for a particular structure.
  • Fig . 9 shows a flow chart for describing the basic operations according to the first embodiment for the SR configuration, which may be performed by the eNB 8 shown in Fig 8.
  • the predetermined threshold Tl
  • the specific identity e.g ., LCID mentioned above
  • the specific identity is defined, to which data is to be transmitted, for which the restriction is to be carried out.
  • the solution according to the second embodiment serves to only allow UE to send the SR when large amount of data is waiting for transmission. Though at eNB side, it can delay the scheduling to avoid small packet transmission, it can not avoid the SR/RACH transmission from UE side, so it is not sufficient. While the threshold method is more efficient for service which is not sensitive to delay.
  • the implementation of the second embodiment can be realized by configuring one buffer threshold for UE. Then, the UE will check the threshold first before sending SR.
  • the buffer threshold (Tl mentioned above) can be configured based on the delay requirement of the service and the load status in the system .
  • Fig . 10 illustrates a simplified block diagram of a user equipment (UE) 10 according to a third embodiment of the present invention.
  • the UE and the corresponding apparatus according to the embodiment may consist only of parts of the UE, so that the apparatus may be installed in an UE, for example.
  • the UE is only an example and may be replaced by another suitable network element.
  • the UE 10 according to this embodiment comprises a processor 101 and a memory 102.
  • the memory comprises a computer program, wherein the memory and the computer program are configured to, with the processor, cause the apparatus to perform several operations as described below by referring to Fig. 11.
  • the UE 10 may also comprise an interface 103 for providing connections to other network elements.
  • the processor 101, the memory 102 and the interface 103 may be interconnected by a suitable connection 104, e.g ., a bus or the like.
  • a suitable connection 104 e.g ., a bus or the like.
  • the apparatus may comprise more than one processor, more than one memory and/or more than one interface, if this is suitable for a particular structure.
  • Fig . 11 shows a flow chart for describing the basic operations according to the third embodiment, which may be performed by the UE 10 shown in Fig 10.
  • the UE 10 is configured to perform discontinuing reception (DRS), wherein a cycle for discontinuing reception is defined, and the cycle includes an inactive time and an active time.
  • DRS discontinuing reception
  • step SI 12 transmission of scheduling requests is restricted based on the cycle for discontinuing reception.
  • the transmission of scheduling requests may be restricted such that a scheduling request is triggered only once during the inactive time in the cycle for discontinuing reception at the most, or a scheduling request is triggered only during the active time in the cycle for discontinuing reception.
  • one RACH transmission can be triggered in one DRX cycle to send the SR if some condition satisfied, e.g., new data arrival, or/and the buffer threshold in exceeded, or/and the prohibit timer is exceeded;
  • Fig . 12 some examples of the above solution are listed.
  • the first row indicates the DRX cycle, wherein the active time ("ON") is emphasized.
  • a narrow solid arrow indicates a valid SR, whereas a dashed arrow indicates an invalid SR.
  • the first example shown in the second row only allows one trigger for SR per DRX cycle and it is triggered in the last possible chance in the inactive time.
  • the second example shown in the third row only puts such limitation to inactive time, while in ON duration, such restriction is removed . That is, according to this example, an SR may be triggered without considering any limitation.
  • the third example shown in the fourth row shows an implementation where SR period is longer than the DRX cycle, and in case no SR resource is available, RACH is triggered in inactive time. That is, for example, RACH may be triggered if no SR resource is available and a buffer threshold (similar as described in connection with the first embodiment) is exceeded . It is noted that triggering of RACH is represented by a wide solid arrow.
  • Fig . 13 shows a further example for implementing the above example of the third embodiment and the following operation of UE and eNB, where a narrow solid arrow represents a valid SR transmission, a dashed arrow means an invalid SR (i.e., configured SR resource but where SR transmission is not allowed), while a dotted arrow directed downwards denotes an UL grant for UEs.
  • a narrow solid arrow represents a valid SR transmission
  • a dashed arrow means an invalid SR (i.e., configured SR resource but where SR transmission is not allowed)
  • a dotted arrow directed downwards denotes an UL grant for UEs.
  • one UE is assigned the periodic SR resource, however, due to the DRX pattern configured and the restriction rule for SR transmission, only some SR resource is seen as valid, this helps reduce unnecessary SR transmission.
  • the SR resource left unused due to this limitation is known to eNB and it can be assigned to other UEs for aperi
  • the UL grant can be sent to UE in DRX ON duration.
  • the UL data can be sent together with some UL feedback signaling for DL transmission in same subframe (which is indicated by rectangle in the fourth row)., this also helps to reduce small data transmission.
  • Fig . 14 shows, that an SR is triggered only in DRX ON duration.
  • the DRX cycle is two times that of the SR period, and SR is triggered only in the DRX ON duration.
  • SR By limiting that only one SR can be triggered in the inactive time (OFF duration) of one DRX cycle, or allow SR only in the active time (ON duration) of one DRX cycle, it is possible to accumulate the UL packets before sending SR, which helps to reduce the possibility of sending small data traffic.
  • SR By limiting SR to the last SR resource in the inactive time, it is possible to effect the UL scheduling or/and PHICH in ON duration together with DL transmission, so that the active time of UL for DL detection may be reduced.
  • the embodiments described above may be combined. For example, the reduction of the SR period as defined in the first embodiment may be applied to the second and third embodiments, so that the SR period is extended and the SR transmission is extended, for example by applying also a threshold .
  • the embodiments described above are implemented with respect to data transmission in MTC or M2M, but the invention is not limited to this, and can be applied to any case in which a scheduling request has to be sent.
  • the UEs only examples for network devices.
  • the use case that the UEs described in the embodiments are operated in connected mode and may be temporarily inactive is only an example.
  • the present invention is not limited to these cases and can be applied to any network device which requires to sent scheduling requests.
  • the eNBs described above are only examples for network control elements.
  • the specific operations for performing the SR configuration, configuration of the threshold Tl and the like may also be carried out by another network control element, for example by a network element on a higher level in a network, in a central manner for the whole network or the like.
  • Embodiments of the present invention may be implemented in software, hardware, application logic or a combination of software, hardware and application logic.
  • the software, application logic and/or hardware generally, but not exclusively, may reside on the devices' modem module.
  • the application logic, software or an instruction set is maintained on any one of various conventional computer-readable media.
  • a "computer-readable medium" may be any media or means that can contain, store, communicate, propagate or transport the instructions for use by or in connection with an instruction execution system, apparatus, or device, such as a computer or smart phone, or user equipment.
  • the present invention relates in particular but without limitation to mobile communications, for example to environments under LTE, WCDMA, WIMAX and WLAN and can advantageously be implemented in user equipments or smart phones, or personal computers connectable to such networks. That is, it can be implemented as/in chipsets to connected devices, and/or modems or other modules thereof.
  • an apparatus comprising
  • an apparatus comprising
  • an apparatus comprising
  • an apparatus comprising
  • a predetermined threshold which is to be used by a network device to restrict triggering of a scheduling request until an amount of data in a buffer for data transmission of the network device exceeds a predetermined threshold .
  • an apparatus comprising

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Abstract

Plusieurs procédures permettant de limiter la transmission de demandes d'ordonnancement sont décrites. Selon une procédure, une période de base destinée à l'envoi de demandes d'ordonnancement vers un élément de commande de réseau est déterminée en fonction d'un paramètre de configuration de demande d'ordonnancement de base, et une période finale destinée à l'envoi des demandes d'ordonnancement est déterminée en fonction de la période de base et d'un paramètre de configuration de demande d'ordonnancement supplémentaire. Selon une autre procédure, le déclenchement d'une demande d'ordonnancement est limité jusqu'à ce que la quantité de données dans une mémoire tampon pour la transmission de données dépasse un seuil prédéfini. Selon encore une autre procédure, la transmission des demandes d'ordonnancement est limitée sur la base du cycle pour arrêter la réception.
PCT/CN2011/081884 2011-11-07 2011-11-07 Procédés, dispositifs et produits programmes d'ordinateur pour une transmission de demandes d'ordonnancement améliorée afin d'accroître l'efficacité des ressources WO2013067677A1 (fr)

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