US20110019628A1 - Method and Apparatus for Scheduling Request - Google Patents

Method and Apparatus for Scheduling Request Download PDF

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Publication number
US20110019628A1
US20110019628A1 US12/789,474 US78947410A US2011019628A1 US 20110019628 A1 US20110019628 A1 US 20110019628A1 US 78947410 A US78947410 A US 78947410A US 2011019628 A1 US2011019628 A1 US 2011019628A1
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Prior art keywords
message
transmission
uplink
resource
communication device
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US12/789,474
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English (en)
Inventor
Li-Chih Tseng
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Innovative Sonic Corp
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Innovative Sonic Corp
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Priority to US12/789,474 priority Critical patent/US20110019628A1/en
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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
    • H04J—MULTIPLEX COMMUNICATION
    • H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/06—Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/02—Power saving arrangements
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the present invention relates to a method and apparatus for performing Scheduling Request, and more particularly, to a method and apparatus for performing Scheduling Request in a user equipment (UE) of a wireless communication system to reduce unnecessary Scheduling Request transmission when the Scheduling Request is sent in a short periodicity, such that power consumption can be saved.
  • UE user equipment
  • LTE system Long Term Evolution wireless communication system
  • MAC Medium Access Control
  • RLC Radio Link Control
  • the network such as an evolved Node B (eNB) performs radio resource allocation to provide user equipments (UEs) with resources for uplink or downlink data transfer.
  • UEs user equipments
  • resource allocations There are two kinds of resource allocations: dynamic resource allocation and pre-configured resource allocation.
  • the network allocates resource to the UEs by Radio Resource Control (RRC) signaling, and allows the UEs periodically transmitting a certain amount of data, for example, voice data. That means, at periodic time intervals, the UEs can utilize the pre-configured radio resources for data transmission or reception, to achieve data exchange with the network.
  • RRC Radio Resource Control
  • the UE when the UE has new uplink data to transmit and there is no Uplink Shared Channel (UL-SCH) resource available, the UE shall trigger a Scheduling Request (SR) procedure to request the network to allocate uplink transmission resources.
  • SR Scheduling Request
  • the UE if the UE has configured Physical Uplink Control Channel (PUCCH) resources, the SR procedure is performed via PUCCH signaling. Otherwise, such as the UE has no configured PUCCH resources or the configured PUCCH resources are invalid, for example, the SR procedure is then performed via a Random Access Procedure.
  • PUCCH Physical Uplink Control Channel
  • D-SR Dedicated Scheduling Request
  • RA-SR Random Access Scheduling Request
  • the UE shall periodically transmit a D-SR message on PUCCH until the SR is cancelled.
  • the SR is cancelled when an uplink transmission resource for a new transmission is received or the number of D-SR transmissions reaches to a pre-defined parameter DSR_TRANS_MAX.
  • DSR_TRANS_MAX When the number of D-SR transmissions reaches to the pre-defined parameter DSR_TRANS_MAX, it indicates uplink transmission of the UE may have some problem, such as the PUCCH resources for SR become invalid (probably due to poor signal quality or improper power settings) or the UE loses synchronization on uplink timing, and thus the D-SR messages sent by the UE cannot be successfully received by the network.
  • the UE shall stop the D-SR transmission, and trigger a Random Access procedure to transmit the SR message instead.
  • a minimum periodicity for sending SR on PUCCH is 5 ms. It means that UE can send an SR on PUCCH every 5 ms. In this case, the average waiting time required by the UE for sending SR on PUCCH is 2.5 ms. For the growing demands on real-time communication services, the waiting time may be too long. Thus, it has been proposed by the industry to consider having a shorter periodicity like 2 or 3 ms. However, when the periodicity is shorter than the time expenditure the eNB requires to handle the SR message or shorter than packet Round Trip Time (RTT), some of the SR transmission is redundant, and causes unnecessary power waste of the UE.
  • RTT Round Trip Time
  • SR Scheduling Request
  • a method for performing Scheduling Request (SR) in a user equipment (UE) of a wireless communication system includes steps of triggering an SR; sending an SR message on a Physical Uplink Control Channel (PUCCH) when the UE has a configured PUCCH resource; and skipping a plurality of transmission opportunities for sending the SR message after the SR message is sent.
  • PUCCH Physical Uplink Control Channel
  • a communications device for performing Scheduling Request (SR) in a user equipment (UE) of a wireless communication system.
  • the communications device includes a processor for executing a program code, and a memory, coupled to the processor, for storing the program code.
  • the program code includes steps of triggering an SR; sending an SR message on a Physical Uplink Control Channel (PUCCH) when the UE has a configured PUCCH resource; and skipping a plurality of transmission opportunities for sending the SR message after the SR message is sent.
  • PUCCH Physical Uplink Control Channel
  • FIG. 1 is a schematic diagram of a wireless communications system.
  • FIG. 2 is a function block diagram of a wireless communications device.
  • FIG. 3 is a diagram of a program code of FIG. 2 .
  • FIG. 4 is a flowchart of a process according to an embodiment of the present invention.
  • FIG. 5 is an operational diagram of the process of FIG. 4 according to the embodiment of the present invention.
  • FIG. 1 illustrates a schematic diagram of a wireless communications system 10 .
  • the wireless communications system 10 is preferred to be a Long Term Evolution (LTE) system, and is briefly composed of a network and a plurality of user equipments (UEs).
  • LTE Long Term Evolution
  • UEs user equipments
  • the network and the UEs are simply utilized for illustrating the structure of the wireless communications system 10 .
  • the network may comprise a plurality of base stations (Node Bs), radio network controllers and so on according to actual demands, and the UEs can be devices such as mobile phones, computer systems, etc.
  • FIG. 2 is a functional block diagram of a communications device 100 in a wireless communications system.
  • the communications device 100 can be utilized for realizing the UEs in FIG. 1 , and the wireless communications system is preferably the LTE system.
  • FIG. 2 only shows an input device 102 , an output device 104 , a control circuit 106 , a central processing unit (CPU) 108 , a memory 110 , a program 112 , and a transceiver 114 of the communications device 100 .
  • the control circuit 106 executes the program 112 in the memory 110 through the CPU 108 , thereby controlling an operation of the communications device 100 .
  • the communications device 100 can receive signals input by a user through the input device 102 , such as a keyboard, and can output images and sounds through the output device 104 , such as a monitor or speakers.
  • the transceiver 114 is used to receive and transmit wireless signals, delivering received signals to the control circuit 106 , and outputting signals generated by the control circuit 106 wirelessly. From a perspective of a communications protocol framework, the transceiver 114 can be seen as a portion of Layer 1 , and the control circuit 106 can be utilized to realize functions of Layer 2 and Layer 3 .
  • FIG. 3 is a schematic diagram of the program 112 shown in FIG. 2 .
  • the program 112 includes an application layer 200 , a Layer 3 202 , and a Layer 2 206 , and is coupled to a Layer 1 218 .
  • the Layer 3 202 is used for performing resource control.
  • the Layer 2 includes a Radio Link Control (RLC) layer and a Medium Access Control (MAC) layer, and is used for performing link control.
  • the Layer 1 218 is used for performing physical connection.
  • RLC Radio Link Control
  • MAC Medium Access Control
  • the UE when the UE has new uplink data to transmit such as uplink data arrives to a transmission buffer of the UE, for example, and there is no Uplink Shared Channel (UL-SCH) resource available, the UE would trigger a Scheduling Request (SR) procedure to request the network to allocate uplink transmission resources, such that the uplink data can be transmitted.
  • SR Scheduling Request
  • the embodiment of the present invention provides a scheduling request program 220 in the program 112 for avoiding unnecessary transmission of scheduling request messages and saving UE power consumption.
  • FIG. 4 illustrates a schematic diagram of a process 40 according to an embodiment of the present invention.
  • the process 40 is utilized for performing Scheduling Request (SR) in a UE of a wireless communication system, and can be compiled into the scheduling request program 220 .
  • the process 40 includes the following steps:
  • Step 400 Start.
  • Step 402 Trigger an SR.
  • Step 404 Send an SR message on a Physical Uplink Control Channel (PUCCH) when the UE has a configured PUCCH resource.
  • PUCCH Physical Uplink Control Channel
  • Step 406 Skip a plurality of SR transmission opportunities after the SR message is sent.
  • Step 408 End.
  • the UE sends an SR message on PUCCH. After the SR message is sent, the UE then skips a plurality of transmission opportunities for sending the SR message. In this case, even a short SR periodicity is used by the UE to transmit the SR message, since the plurality of SR transmission opportunities is skipped each time after the SR message is sent, the embodiment of the present invention is able to reduce unnecessary transmission of the SR message, while the average waiting time for sending the SR message can still be shortened.
  • the UE shall keep on sending the SR message at a next transmission opportunity. Note that the SR is cancelled when an uplink transmission resource for a new transmission is received or the number of times the SR message is sent reaches to a pre-defined parameter DSR_TRANS_MAX.
  • FIG. 5 is an operational diagram of the process 40 according to the embodiment of the present invention.
  • an SR is triggered due to uplink data arrival at a timing point T 1 .
  • transmission opportunities for the UE to send an SR message would be periodically formed on PUCCH (timing points T 2 -T 6 ).
  • the time interval between each transmission opportunity is configured according to periodicity of the PUCCH resource, which can be 1 ms to 4 ms but is not limited to these.
  • the UE sends the SR message at a first transmission opportunity (i.e. at the timing point T 2 ).
  • the UE skips a plurality of transmission opportunities, such as two transmission opportunities in this case, for example. If the SR is still pending after the plurality of transmission opportunities is skipped, the UE then sends the SR message again at a next transmission opportunity (i.e. at the timing point T 5 ). And, the UE repeats in this manner until the SR is cancelled.
  • the UE since the plurality of follow-up transmission opportunity is skipped by the UE each time after the SR message is sent, the UE is able to avoid unnecessary transmissions of the SR message till receiving response from the network, so that the power consumption can be saved. Accordingly, the short SR periodicity can still be used by the UE, and thus the average waiting time required by the UE for sending the SR message (i.e. the time interval between the timing points T 1 and T 2 ) can be significantly shortened as well.
  • the way that the UE skips the plurality of opportunity can be controlled by a counter or a timer, which is also not restricted by this.
  • the embodiment of the present invention provides a method and apparatus for performing scheduling request to avoid unnecessary transmission of the SR message when the UE uses the short SR periodicity, such that power consumption can be saved.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
US12/789,474 2009-07-23 2010-05-28 Method and Apparatus for Scheduling Request Abandoned US20110019628A1 (en)

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US12/842,041 Active 2031-05-05 US8665822B2 (en) 2009-07-23 2010-07-23 Method and apparatus for handling physical downlink control channel orders in wireless communication system

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US (2) US20110019628A1 (ko)
EP (2) EP2282597B1 (ko)
JP (1) JP2011030197A (ko)
KR (1) KR101176911B1 (ko)
CN (1) CN101965021A (ko)
ES (2) ES2395655T3 (ko)
PL (1) PL2282598T3 (ko)
TR (1) TR201905654T4 (ko)
TW (2) TW201127157A (ko)

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US20150003430A1 (en) * 2010-03-12 2015-01-01 Blackberry Limited Timing advance enhancements for cellular communications
US20150223232A1 (en) * 2012-08-27 2015-08-06 Telefonaktiebolaget L M Ericsson (Publ) Methods and Arrangements for Resource Allocation
CN109076519A (zh) * 2016-02-25 2018-12-21 捷开通讯(深圳)有限公司 蜂窝通信系统中调度传输的方法和装置
US11229044B2 (en) * 2017-08-02 2022-01-18 Guangdong Oppo Mobile Telecommunications Corp., Ltd. Uplink transmission method, and terminal device

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US20120300714A1 (en) * 2011-05-06 2012-11-29 Samsung Electronics Co., Ltd. Methods and apparatus for random access procedures with carrier aggregation for lte-advanced systems
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US20130294418A1 (en) * 2012-05-04 2013-11-07 Nokia Siemens Networks Oy Switching Between Remote Radio Heads
EP3376814A4 (en) * 2015-11-12 2018-10-31 Fujitsu Limited Terminal device, base station device, wireless communication system, and wireless communication method
KR101977464B1 (ko) 2016-05-12 2019-05-10 아서스테크 컴퓨터 인코포레이션 무선 통신 시스템에서의 단축된 전송 시간 간격에서 업링크 승인을 개선시키기 위한 방법 및 장치
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US20110199991A1 (en) * 2010-02-16 2011-08-18 Motorola, Inc. Increasing scheduling request effciency in a wireless communication system
US8331394B2 (en) * 2010-02-16 2012-12-11 Motorola Mobility Llc Increasing scheduling request efficiency in a wireless communication system
US20160242133A1 (en) * 2010-03-12 2016-08-18 Blackberry Limited Timing advance enhancements for cellular communications
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US9332511B2 (en) * 2010-03-12 2016-05-03 Blackberry Limited Timing advance enhancements for cellular communications
US9807715B2 (en) * 2010-03-12 2017-10-31 Blackberry Limited Timing advance enhancements for cellular communications
US20180063804A1 (en) * 2010-03-12 2018-03-01 Blackberry Limited Timing advance enhancements for cellular communications
US10972988B2 (en) * 2010-03-12 2021-04-06 Blackberry Limited Timing advance enhancements for cellular communications
US20210204237A1 (en) * 2010-03-12 2021-07-01 Blackberry Limited Timing advance enhancements for cellular communications
US11627537B2 (en) * 2010-03-12 2023-04-11 Blackberry Limited Timing advance enhancements for cellular communications
US20150223232A1 (en) * 2012-08-27 2015-08-06 Telefonaktiebolaget L M Ericsson (Publ) Methods and Arrangements for Resource Allocation
WO2014047862A1 (en) * 2012-09-28 2014-04-03 Broadcom Corporation Methods, devices and computer program products for scheduling request transmission
CN109076519A (zh) * 2016-02-25 2018-12-21 捷开通讯(深圳)有限公司 蜂窝通信系统中调度传输的方法和装置
US11229044B2 (en) * 2017-08-02 2022-01-18 Guangdong Oppo Mobile Telecommunications Corp., Ltd. Uplink transmission method, and terminal device

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TW201129159A (en) 2011-08-16
US20110019619A1 (en) 2011-01-27
PL2282598T3 (pl) 2019-08-30
ES2721602T3 (es) 2019-08-01
TW201127157A (en) 2011-08-01
ES2395655T3 (es) 2013-02-14
EP2282597B1 (en) 2012-09-19
EP2282598B1 (en) 2019-01-30
EP2282597A1 (en) 2011-02-09
CN101965021A (zh) 2011-02-02
KR20110010053A (ko) 2011-01-31
EP2282598A1 (en) 2011-02-09
TWI440374B (zh) 2014-06-01
US8665822B2 (en) 2014-03-04
JP2011030197A (ja) 2011-02-10
KR101176911B1 (ko) 2012-08-30

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