WO2021030999A1 - Power control for radio resource management in telecommunication systems - Google Patents

Power control for radio resource management in telecommunication systems Download PDF

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Publication number
WO2021030999A1
WO2021030999A1 PCT/CN2019/101172 CN2019101172W WO2021030999A1 WO 2021030999 A1 WO2021030999 A1 WO 2021030999A1 CN 2019101172 W CN2019101172 W CN 2019101172W WO 2021030999 A1 WO2021030999 A1 WO 2021030999A1
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WIPO (PCT)
Prior art keywords
measurement
control information
power consumption
priority
consumption level
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PCT/CN2019/101172
Other languages
French (fr)
Inventor
Jing He
Tero Henttonen
Amaanat ALI
Jorma Kaikkonen
Mads LAURIDSEN
Original Assignee
Nokia Shanghai Bell Co., Ltd.
Nokia Solutions And Networks Oy
Nokia Technologies Oy
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.)
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Application filed by Nokia Shanghai Bell Co., Ltd., Nokia Solutions And Networks Oy, Nokia Technologies Oy filed Critical Nokia Shanghai Bell Co., Ltd.
Priority to CN201980099408.XA priority Critical patent/CN114303416A/en
Priority to PCT/CN2019/101172 priority patent/WO2021030999A1/en
Publication of WO2021030999A1 publication Critical patent/WO2021030999A1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H04W36/0085—Hand-off measurements
    • H04W36/0094—Definition of hand-off measurement parameters
    • 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

  • Embodiments of the present disclosure generally relate to the field of telecommunication and in particular, to devices, methods, apparatuses and computer readable storage media of power control for the measurement of Radio Resource Management (RRM) .
  • RRM Radio Resource Management
  • the network device may make a handover decision for the terminal device based on the measurement value from terminal device.
  • the five basic RRM measurements in Long Term Evolution (LTE) system are Channel Quality Indicator (CQI) , Reference Signal Received Power (RSRP) , Reference Signal Received Quality (RSRQ) , Reference Signal-Signal to Noise and Interference (RS-SINR) and Carrier Received Signal Strength Indicator (RSSI) .
  • CQI Channel Quality Indicator
  • RSRP Reference Signal Received Power
  • RSRQ Reference Signal Received Quality
  • RS-SINR Reference Signal-Signal to Noise and Interference
  • RSSI Carrier Received Signal Strength Indicator
  • example embodiments of the present disclosure provide a solution of power control for the measurement of RRM.
  • a first device comprising at least one processor; and at least one memory including computer program codes; the at least one memory and the computer program codes are configured to, with the at least one processor, cause the first device at least to determine a priority of at least one measurement of radio resource management to be performed by a second device; generate control information for the at least one measurement based on the priority; and transmit the control information to the second device.
  • a second device comprising at least one processor; and at least one memory including computer program codes; the at least one memory and the computer program codes are configured to, with the at least one processor, cause the second device at least to receive, from a first device, control information at least one measurement of radio resource management to be performed by the second device, the control information being generated based on the priority of the at least one measurement; determine a pattern for controlling the at least one measurement based on the control information; and perform the at least one measurement based on the pattern.
  • a method comprises determining, at a first device, a priority of at least one measurement of radio resource management to be performed by a second device; generating control information for the at least one measurement based on the priority; and transmitting the control information to the second device.
  • a method comprises receiving, from a first device, control information at least one measurement of radio resource management to be performed by a second device, the control information being generated based on the priority of the at least one measurement; determining a pattern for controlling the at least one measurement based on the control information; and performing the at least one measurement based on the pattern.
  • an apparatus comprises means for determining, at a first device, a priority of at least one measurement of radio resource management to be performed by a second device; means for generating control information for the at least one measurement based on the priority; and means for transmitting the control information to the second device.
  • an apparatus comprises means for receiving, from a first device, control information at least one measurement of radio resource management to be performed by a second device, the control information being generated based on the priority of the at least one measurement; means for determining a pattern for controlling the at least one measurement based on the control information; and means for performing the at least one measurement based on the pattern.
  • a computer readable medium having a computer program stored thereon which, when executed by at least one processor of a device, causes the device to carry out the method according to the third aspect.
  • a computer readable medium having a computer program stored thereon which, when executed by at least one processor of a device, causes the device to carry out the method according to the fourth aspect.
  • FIG. 1 shows an example communication network in which example embodiments of the present disclosure may be implemented
  • FIG. 2 shows a schematic diagram illustrating a process of power control for the measurement of RRM according to example embodiments of the present disclosure
  • FIG. 3 shows a flowchart of an example method 300 of power control for the measurement of RRM according to some example embodiments of the present disclosure
  • FIG. 4 shows a flowchart of an example method 400 of power control for the measurement of RRM according to some example embodiments of the present disclosure
  • FIG. 5 shows a simplified block diagram of a device that is suitable for implementing example embodiments of the present disclosure.
  • Fig. 6 shows a block diagram of an example computer readable medium in accordance with some embodiments of the present disclosure.
  • the term “communication network” refers to a network following any suitable communication standards, such as Long Term Evolution (LTE) , LTE-Advanced (LTE-A) , Wideband Code Division Multiple Access (WCDMA) , High-Speed Packet Access (HSPA) , New Radio (NR) and so on.
  • LTE Long Term Evolution
  • LTE-A LTE-Advanced
  • WCDMA Wideband Code Division Multiple Access
  • HSPA High-Speed Packet Access
  • NR New Radio
  • the communications between a terminal device and a network device in the communication network may be performed according to any suitable generation communication protocols, including, but not limited to, the first generation (1G) , the second generation (2G) , 2.5G, 2.75G, the third generation (3G) , the fourth generation (4G) , 4.5G, the future fifth generation (5G) communication protocols, and/or any other protocols either currently known or to be developed in the future.
  • Embodiments of the present disclosure may be applied in various communication systems. Given the rapid development in communications, there will of course also be future type communication technologies and systems with which the present disclosure may be embodied. It should not be seen as limiting the scope of the present disclosure to only the aforementioned system. For the purpose of illustrations, embodiments of the present disclosure will be described with reference to 5G communication system.
  • the term “network device” used herein includes, but not limited to, a base station (BS) , a gateway, a registration management entity, and other suitable device in a communication system.
  • base station or “BS” represents a node B (NodeB or NB) , an evolved NodeB (eNodeB or eNB) , a New Radio (NR) NB (also referred to as a gNB) , a Remote Radio Unit (RRU) , a radio header (RH) , a remote radio head (RRH) , a relay, a low power node such as a femto, a pico, and so forth.
  • NodeB or NB node B
  • eNodeB or eNB evolved NodeB
  • NR New Radio
  • RRU Remote Radio Unit
  • RH radio header
  • RRH remote radio head
  • relay a low power node such as a femto, a pico, and so forth.
  • terminal device includes, but not limited to, “user equipment (UE) ” and other suitable end device capable of communicating with the network device.
  • the “terminal device” may refer to a terminal, a Mobile Terminal (MT) , a Subscriber Station (SS) , a Portable Subscriber Station, a Mobile Station (MS) , or an Access Terminal (AT) .
  • MT Mobile Terminal
  • SS Subscriber Station
  • MS Mobile Station
  • AT Access Terminal
  • circuitry used herein may refer to one or more or all of the following:
  • circuitry also covers an implementation of merely a hardware circuit or processor (or multiple processors) or portion of a hardware circuit or processor and its (or their) accompanying software and/or firmware.
  • circuitry also covers, for example and if applicable to the particular claim element, a baseband integrated circuit or processor integrated circuit for a mobile device or a similar integrated circuit in server, a cellular network device, or other computing or network device.
  • FIG. 1 shows an example communication network 100 in which embodiments of the present disclosure can be implemented.
  • the network 100 includes a first device 110 (hereinafter may be referred as to a network device 110) and second devices 120-1 and 120-2 (hereinafter collectively referred to as second devices 120 or individually referred to as a terminal device 120) served by the network device 110.
  • the serving area of the network device 110 is called as a cell 102.
  • the network 100 may include any suitable number of network devices and terminal devices adapted for implementing embodiments of the present disclosure. Although not shown, it would be appreciated that one or more terminal devices may be in the cell 102 and served by the network device 110.
  • the communications in the network 100 may conform to any suitable standards including, but not limited to, New Radio (NR) , Long Term Evolution (LTE) , LTE-Evolution, LTE-Advanced (LTE-A) , Wideband Code Division Multiple Access (WCDMA) , Code Division Multiple Access (CDMA) and Global System for Mobile Communications (GSM) and the like.
  • NR New Radio
  • LTE Long Term Evolution
  • LTE-Evolution LTE-Advanced
  • WCDMA Wideband Code Division Multiple Access
  • CDMA Code Division Multiple Access
  • GSM Global System for Mobile Communications
  • the communications may be performed according to any generation communication protocols either currently known or to be developed in the future. Examples of the communication protocols include, but not limited to, the first generation (1G) , the second generation (2G) , 2.5G, 2.75G, the third generation (3G) , the fourth generation (4G) , 4.5G, the fifth generation (5G) communication protocols.
  • the network device may make a handover decision for the terminal device based on the measurement value from terminal device.
  • the five basic RRM measurements in LTE system are CQI, RSRP, RSRQ, RS-SINR and RSSI.
  • CQI CQI
  • RSRP RSRQ
  • RS-SINR RS-SINR
  • RSSI RSSI
  • the objective of the terminal device power saving may include the following: network-configured mechanism may be specified to relax intra and inter-frequency RRM measurement for neighbour cells for RRC_IDLE/INACTIVE with minimal mobility performance impacts.
  • the proposals for power saving of the terminal device only focus on network-configured Enable/Disable indication or threshold to control the RRM measurement relaxation of the terminal device. For example, when the network device indicates “Enabling” to the terminal device, the terminal device may drop any configured intra-f, inter-f or inter-RAT measurement to reduce power consumption. Vice versa, indicated “Disabling” means the terminal device is not allowed to drop any measurements for power saving intention.
  • the network device may configure one predetermined threshold of a specific RRM measurement, such as RSRP, RSPQ, RS-SINR or RSSI to the terminal device.
  • a specific RRM measurement such as RSRP, RSPQ, RS-SINR or RSSI
  • the terminal device may be located at the cell central area and lack possibility to do handover.
  • the mobility status of the terminal device e.g. stationary or fast-moving
  • SIBs System Information Blocks
  • SFTD Space Frequency Transmit Diversity
  • CGI Cell Global Identifier
  • the number of measured frequencies can be reduced in inter-frequency RRM measurement relaxation. Furthermore, for inter-frequency RRM measurement reduction, the measured frequency group and association relationship between the measured frequencies can be indicated to the terminal device in system information or measurement configuration information, and the terminal device can randomly select one of the frequency layers in the same group to perform RRM measurement.
  • the network device may indicate to the terminal device any carrier aggregation Component Carrier (CC) collocation information. That is, the network device will indicate to the terminal device if the terminal device can assume same channel conditions for CC (e.g. intra-band CCs) and therefore the terminal device would be allowed to relax measurements requirements on some CCs compared to the main CC.
  • CC carrier aggregation Component Carrier
  • number of measured intra-frequency cells should be reduced for power saving of the terminal device in NR.
  • an additional threshold can be introduced to reduce the number of intra-frequency measurements based on S-measure enhancement.
  • none of the conventional approaches suggest a network controlled power saving mechanism for the terminal device, to ensure that the terminal device will not drop any important measurement objects on one hand and reduce the power consumption while maintaining the mobility performance and the network load balancing on the other hand.
  • the embodiments of the present disclosure propose a network controlled mechanism for the RRM measurement of the terminal device.
  • the network device may generate the control information for the RRM measurement base on the priority of the measurements.
  • the priority may be associated with the attributes of the measurements or a desired power consumption level of the terminal device.
  • FIG. 2 shows a schematic diagram of a process 200 of power control for the measurement of RRM according to example embodiments of the present disclosure.
  • the process 200 will be described with reference to FIG. 1.
  • the process 200 may involve the network device 110 and the terminal device 120 as illustrated in FIG. 1.
  • the network device 110 determines 210 the priority of at least one RRM measurement to be performed at the terminal device 120.
  • the priority may be associated with at least one attributes of the RRM measurement.
  • the attributes of the RRM measurement may comprise the object of the measurements, the type of the measurements and the identifier of the measurements or a range of frequency to be measured for the at least one measurement. It should be understood that the attributes listed above are only illustrative and will not limit the present disclosure. Any other attributes associated with the RRM measurements will also be considered as the above-mention attributes of measurement.
  • the priority based on the attributes may indicate, such as, the intra-frequency measurements is more important than the inter-frequency measurements for the terminal device 120.
  • the attributes may also refer a set of parameters associated with the measurement report.
  • the related parameters may comprise a time period for reporting the measurement result, the trigger event of the report, a CGI or a System Frame Number (SFN) and Frame Timing Difference (SFTD) .
  • SFN System Frame Number
  • SFTD Frame Timing Difference
  • the network device 110 may determine the priority of the RRM measurements related to at least one above-mentioned attribute of the measurement.
  • the priority may also be associated with the specific power consumption level for the terminal device 120.
  • the network device 110 may determine an expected power consumption level for the terminal device 120 and the power consumption level for each of the RRM measurements to be performed, respectively. Then the network device 110 may determine the priority of the RRM measurement based on the expected power consumption level and the determined power consumption level for each of the RRM measurements.
  • the expected power consumption level of the terminal device 120 may be represented as a percentage, i.e., 100%power consumption, 50%power consumption or 30%power consumption etc.
  • the network device 110 may determine the priority of the RRM measurement in a specific level based on the power consumption required for the RRM measurement.
  • the network device 110 may also determine the time consumed for each of the RRM measurement to be performed at the terminal device 120, because the time that the terminal device spends performing the RRM measurement may affect the power consumption level of the terminal device 120. For example, the measurement which requires the shortest measuring time may have the highest priority to be performed.
  • the network device 110 After determining the priority, the network device 110 generates the control information for the RRM measurement to be performed at the terminal device 120.
  • control information may comprise at least one pattern for controlling the at least one measurement.
  • the pattern for controlling the at least one measurement may be determined based on the determined priority related to at least one of the attributes of the RRM measurement and the expected power consumption level.
  • the network device 120 may determine the pattern based on the priority and the attributes.
  • the pattern may indicate an order for dropping the specific measurement, such as which RRM measurement or what kind of RRM measurement can be dropped first and which RRM measurement can be dropped second, etc.
  • the pattern may also indicate which measurements cannot be dropped.
  • the pattern may also indicate an order for performing the at least one measurement, an order for recovering the dropped at least one measurement or a specific type of measurement to be maintained.
  • the pattern for controlling the measurement can be represented as any form related to the priority, the attributes or the expected power consumption level.
  • the network device 120 may generate the control information based on the determined pattern.
  • Two example control information may be shown in the following tables.
  • control information may be represented as below.
  • control information may include “PowersavingPriorityInfo” for indicating the specific measurement cannot be dropped.
  • control information may be represented as below.
  • control information may include “PowersavingPriorityInfo” for indicating specific RRM measurement cannot be dropped.
  • control information can be a one-bit indication as the simplest format, e.g. “The measurement object can or cannot be dropped” , “Measurement to FR1 or FR2 can or cannot be dropped” or “Measurement to one reportType can or cannot be dropped. ”
  • the network device 120 may determine the pattern based on the priority and the expected power consumption level related to any of the at least one attribute of RRM measurement, the power consumption level required for RRM measurement and a time interval for performing the RRM measurement. The network device 120 may further generate the control information based on the pattern.
  • the pattern may indicate an association between the expected power consumption level, the attribute information and the power consumption level required for the RRM measurement.
  • the pattern may also indicate an association between the expected power consumption level, the attribute information and the time interval for performing the RRM measurement.
  • the pattern may indicate for 30%power consumption, what kind/type measurement should be maintained or dropped.
  • the corresponding control information may be represented as “Level 1 RRM measurement-dropped first, Level 2 RRM measurement-dropped after all Level1 RRM measurements dropped, Level 3 RRM measurement -dropped after all Level 2 measurements dropped. ”
  • the level of the RRM measurement may depends on the determined priority of the measurements.
  • Example control information may be shown in the following tables. As an example, if the pattern indicates that 50%measurement activity shall be maintained when the terminal device 120 decides to relax measurements.
  • the control information may be represented as below.
  • control information may include “PowersavingPriorityInfo” for indicating specific RRM measurement cannot be dropped/maintained.
  • the network device 110 transmits 220 the control information to the terminal device 120.
  • the control information may transmit to the terminal device 120 via Radio Resource Control (RRC) signaling. If the control information is generated for controlling multiple terminal devices, the network device 110 may broadcast the control information.
  • RRC Radio Resource Control
  • the terminal device 120 may receive the control information from the network device 110 and determine 230 the pattern for controlling the at least one measurement from the control information.
  • the terminal device 120 may determine the order for dropping or maintaining the specific type of the RRM measurements, e.g., “First drop inter-RAT measurements, then drop inter-frequency measurements, and then drop inter-frequency measurements. ”
  • the terminal device 120 may determine the time interval for specific type or level of the RRM measurement, e.g., “first increase inter-frequency measurement periodicity to T1 ms, then increase intra-frequency measurement periodicity to T2 ms, then drop inter-frequency measurements and then increase intra-frequency measurement periodicity to T3 ms, but not beyond it. ”
  • the terminal device 120 may measure RSRP/RSRQ and determine RRM measurement to be performed or dropped based on the measured RSRP/RSRQ and the pattern. For example, the terminal device 120 may be allowed to drop inter-frequency measurements, but only if intra-frequency RSRP lower than a predetermined value.
  • the terminal device 120 may also determine the pattern for recovering the dropped RRM measurement.
  • the pattern may indicate “first inter-RAT measurements are dropped, then inter-frequency measurements are dropped, i.e. only intra-frequency measurements remain, then inter-frequency layers are measured again when the RSRP of intra-frequency exceeds a predetermined value, e.g. x dBm, and finally, inter-RAT measurements are performed if RSRP of intra-frequency is y dBm (where y > x) . ”
  • the x and y levels would be different from the criteria levels that triggered the dropping to avoid ping pong effects, i.e. there is a hysteresis between the exit and entry “x” .
  • the terminal device 120 may perform the RRM measurement based on the determined pattern for controlling the at least one measurement.
  • the network device 110 may adjust the control information according to traffic steering/load, the mobility speed of the terminal device, which means the priority may be changed in different load scenario or different traffic types.
  • the terminal device 120 may also select the pattern for controlling the at least one measurement based on the required power consumption level, if the pattern, for example, indicate the association between different power consumption levels and corresponding group of measurements.
  • the proposed solution of the present disclosure enables network to control that the terminal device does not drop any important measurement objects by itself and can keep necessary measurement to be maintained. Furthermore, this solution also enables power saving of the terminal device by reduced measurements, while also maintaining mobility performance and network load balancing by use of network-controlled prioritized measurements.
  • FIG. 3 shows a flowchart of an example method 300 of power control for the measurement of RRM according to some example embodiments of the present disclosure.
  • the method 300 can be implemented at the network device 110 as shown in FIG. 1. For the purpose of discussion, the method 300 will be described with reference to FIG. 1.
  • the network device 110 determines a priority of at least one measurement of radio resource management to be performed by the terminal device 120.
  • the network device 110 may obtain at least one attribute of the at least one measurement, comprising at least one of the following: an object of the at least one measurement, a type of the at least one measurement, an identifier of the at least one measurement, a range of frequency for the at least one measurement and parameters associated with a report of the at least one measurement.
  • the network device 110 may determine the priority based on the attribute information.
  • the parameters associated with the report comprises at least one of the following a time period for reporting a result of the at least one measurement, a triggering condition for reporting the result, a Cell Global Identity for the report, and a System Frame Number (SFN) and Frame Timing Difference (SFTD) for the report.
  • SFN System Frame Number
  • SFTD Frame Timing Difference
  • the network device 110 may determine a time interval for performing the at least one measurement and an expected power consumption level for the terminal device 120. The network device 110 may also determine the priority based on the time interval and the expected power consumption level.
  • the network device 110 generates control information for the at least one measurement based on the priority.
  • the network device 110 may obtain at least one attribute of the at least one measurement.
  • the network device 110 may determine a pattern for controlling the at least one measurement based on the at least one attribute and the priority.
  • the network device 110 may generate the control information based on the pattern.
  • the network device 110 may obtain an expected power consumption level for the terminal device 120.
  • the network device 110 may determine a pattern for controlling the at least one measurement based on the expected power consumption level, the priority and at least one of the following: at least one attribute of the at least one measurement, a power consumption level required for the at least one measurement; and a time interval for performing the at least one measurement.
  • the network device 110 may also generate the control information based on the pattern.
  • the pattern may comprise at least one of the following an order for performing the at least one measurement, an order for dropping the at least one measurement, an order for recovering the at least one measurement, a first portion of measurements in the at least one measurement to be performed, a time interval for performing the first portion of measurements, a second portion of measurements in the at least one measurement to be dropped, and a time interval for recovering the second portion of measurements, an association between the expected power consumption level, the attribute information and the power consumption level required for the at least one measurement, and an association between the expected power consumption level, the attribute information and the time interval for performing the at least one measurement.
  • the network device 110 transmits the control information to the terminal device 120. In some example embodiments.
  • the network device 110 may transmit the control information to the second device via RRC signaling.
  • the network device 110 may broadcast the control information.
  • FIG. 4 shows a flowchart of an example method 400 of power control for the measurement of RRM according to some example embodiments of the present disclosure.
  • the method 400 can be implemented at the terminal device 120 as shown in FIG. 1. For the purpose of discussion, the method 400 will be described with reference to FIG. 1.
  • the terminal device 120 receives, from network device 110, control information at least one measurement of radio resource management to be performed by the second device, the control information being generated based on the priority of the at least one measurement.
  • the terminal device 120 determines a pattern for controlling the at least one measurement based on the control information.
  • the network device 110 perform the at least one measurement based on the pattern.
  • the pattern may comprise at least one of the following an order for performing the at least one measurement, an order for dropping the at least one measurement, an order for recovering the at least one measurement, a first portion of measurements in the at least one measurement to be performed, a time interval for performing the first portion of measurements, a second portion of measurements in the at least one measurement to be dropped, and a time interval for recovering the second portion of measurements, an association between the expected power consumption level, the attribute information and the power consumption level required for the at least one measurement, and an association between the expected power consumption level, the attribute information and the time interval for performing the at least one measurement.
  • an apparatus capable of performing the method 300 may comprise means for performing the respective steps of the method 300.
  • the means may be implemented in any suitable form.
  • the means may be implemented in a circuitry or software module.
  • the apparatus comprises means for determining, at a first device, a priority of at least one measurement of radio resource management to be performed by a second device; means for generating control information for the at least one measurement based on the priority; and means for transmitting the control information to the second device.
  • an apparatus capable of performing the method 400 may comprise means for performing the respective steps of the method 400.
  • the means may be implemented in any suitable form.
  • the means may be implemented in a circuitry or software module.
  • the apparatus comprises means for receiving, from a first device, control information at least one measurement of radio resource management to be performed by a second device, the control information being generated based on the priority of the at least one measurement; means for determining a pattern for controlling the at least one measurement based on the control information; and means for performing the at least one measurement based on the pattern.
  • FIG. 5 is a simplified block diagram of a device 500 that is suitable for implementing embodiments of the present disclosure.
  • the device 500 may be provided to implement the communication device, for example the terminal device 120 and the network device 110 as shown in FIG. 1.
  • the device 500 includes one or more processors 510, one or more memories 540 coupled to the processor 510, and one or more transmitters and/or receivers (TX/RX) 540 coupled to the processor 510.
  • TX/RX transmitters and/or receivers
  • the TX/RX 540 is for bidirectional communications.
  • the TX/RX 540 has at least one antenna to facilitate communication.
  • the communication interface may represent any interface that is necessary for communication with other network elements.
  • the processor 510 may be of any type suitable to the local technical network and may include one or more of the following: general purpose computers, special purpose computers, microprocessors, digital signal processors (DSPs) and processors based on multicore processor architecture, as non-limiting examples.
  • the device 500 may have multiple processors, such as an application specific integrated circuit chip that is slaved in time to a clock which synchronizes the main processor.
  • the memory 520 may include one or more non-volatile memories and one or more volatile memories.
  • the non-volatile memories include, but are not limited to, a Read Only Memory (ROM) 524, an electrically programmable read only memory (EPROM) , a flash memory, a hard disk, a compact disc (CD) , a digital video disk (DVD) , and other magnetic storage and/or optical storage.
  • the volatile memories include, but are not limited to, a random access memory (RAM) 522 and other volatile memories that will not last in the power-down duration.
  • a computer program 530 includes computer executable instructions that are executed by the associated processor 510.
  • the program 530 may be stored in the ROM 520.
  • the processor 510 may perform any suitable actions and processing by loading the program 530 into the RAM 520.
  • the embodiments of the present disclosure may be implemented by means of the program 530 so that the device 500 may perform any process of the disclosure as discussed with reference to FIGs. 2 to 4.
  • the embodiments of the present disclosure may also be implemented by hardware or by a combination of software and hardware.
  • the program 530 may be tangibly contained in a computer readable medium which may be included in the device 500 (such as in the memory 520) or other storage devices that are accessible by the device 500.
  • the device 500 may load the program 530 from the computer readable medium to the RAM 522 for execution.
  • the computer readable medium may include any types of tangible non-volatile storage, such as ROM, EPROM, a flash memory, a hard disk, CD, DVD, and the like.
  • Fig. 6 shows an example of the computer readable medium 600 in form of CD or DVD.
  • the computer readable medium has the program 530 stored thereon.
  • various embodiments of the present disclosure may be implemented in hardware or special purpose circuits, software, logic or any combination thereof. Some aspects may be implemented in hardware, while other aspects may be implemented in firmware or software which may be executed by a controller, microprocessor or other computing device. While various aspects of embodiments of the present disclosure are illustrated and described as block diagrams, flowcharts, or using some other pictorial representations, it is to be understood that the block, apparatus, system, technique or method described herein may be implemented in, as non-limiting examples, hardware, software, firmware, special purpose circuits or logic, general purpose hardware or controller or other computing devices, or some combination thereof.
  • the present disclosure also provides at least one computer program product tangibly stored on a non-transitory computer readable storage medium.
  • the computer program product includes computer-executable instructions, such as those included in program modules, being executed in a device on a target real or virtual processor, to carry out the methods 300 and 400 as described above with reference to FIGs. 3-4.
  • program modules include routines, programs, libraries, objects, classes, components, data structures, or the like that perform particular tasks or implement particular abstract data types.
  • the functionality of the program modules may be combined or split between program modules as desired in various embodiments.
  • Machine-executable instructions for program modules may be executed within a local or distributed device. In a distributed device, program modules may be located in both local and remote storage media.
  • Program code for carrying out methods of the present disclosure may be written in any combination of one or more programming languages. These program codes may be provided to a processor or controller of a general purpose computer, special purpose computer, or other programmable data processing apparatus, such that the program codes, when executed by the processor or controller, cause the functions/operations specified in the flowcharts and/or block diagrams to be implemented.
  • the program code may execute entirely on a machine, partly on the machine, as a stand-alone software package, partly on the machine and partly on a remote machine or entirely on the remote machine or server.
  • the computer program codes or related data may be carried by any suitable carrier to enable the device, apparatus or processor to perform various processes and operations as described above.
  • Examples of the carrier include a signal, computer readable medium, and the like.
  • the computer readable medium may be a computer readable signal medium or a computer readable storage medium.
  • a computer readable medium may include but not limited to an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. More specific examples of the computer readable storage medium would include an electrical connection having one or more wires, a portable computer diskette, a hard disk, a random access memory (RAM) , a read-only memory (ROM) , an erasable programmable read-only memory (EPROM or Flash memory) , an optical fiber, a portable compact disc read-only memory (CD-ROM) , an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

Abstract

Embodiments of the present disclosure relate to devices, methods, apparatuses and computer readable storage media of power control for the measurement of Radio Resource Management (RRM). The method comprises determining, at a first device, a priority of at least one measurement of radio resource management to be performed by a second device; generating control information for the at least one measurement based on the priority; and transmitting the control information to the second device. In this way, the proposed solution of the present disclosure enables network to control that the terminal device does not drop any important measurement objects by itself and can keep necessary measurement to be maintained. Furthermore, this solution also enables power saving of the terminal device by reduced measurements, while also maintaining mobility performance and network load balancing by use of network-controlled prioritized measurements.

Description

POWER CONTROL FOR RADIO RESOURCE MANAGEMENT IN TELECOMMUNICATION SYSTEMS FIELD
Embodiments of the present disclosure generally relate to the field of telecommunication and in particular, to devices, methods, apparatuses and computer readable storage media of power control for the measurement of Radio Resource Management (RRM) .
BACKGROUND
One of the most important steps for handover is the measurement report of RRM from terminal device before the handover. The network device may make a handover decision for the terminal device based on the measurement value from terminal device. There are many different measurement items and many different ways to measure the signal quality of the serving cell and candidate cell.
The five basic RRM measurements in Long Term Evolution (LTE) system are Channel Quality Indicator (CQI) , Reference Signal Received Power (RSRP) , Reference Signal Received Quality (RSRQ) , Reference Signal-Signal to Noise and Interference (RS-SINR) and Carrier Received Signal Strength Indicator (RSSI) . For New Radio (NR) , the power saving for the terminal device will be further studied and discussed. It has been considered achieving the power saving by dropping the specific measurements.
SUMMARY
In general, example embodiments of the present disclosure provide a solution of power control for the measurement of RRM.
In a first aspect, there is provided a first device. The first device comprises at least one processor; and at least one memory including computer program codes; the at least one memory and the computer program codes are configured to, with the at least one processor, cause the first device at least to determine a priority of at least one measurement of radio resource management to be performed by a second device; generate control information for the at least one measurement based on the priority; and transmit the control information to the second device.
In a second aspect, there is provided a second device. The second device comprises at least one processor; and at least one memory including computer program codes; the at least one memory and the computer program codes are configured to, with the at least one processor, cause the second device at least to receive, from a first device, control information at least one measurement of radio resource management to be performed by the second device, the control information being generated based on the priority of the at least one measurement; determine a pattern for controlling the at least one measurement based on the control information; and perform the at least one measurement based on the pattern.
In a third aspect, there is provided a method. The method comprises determining, at a first device, a priority of at least one measurement of radio resource management to be performed by a second device; generating control information for the at least one measurement based on the priority; and transmitting the control information to the second device.
In a fourth aspect, there is provided a method. The method comprises receiving, from a first device, control information at least one measurement of radio resource management to be performed by a second device, the control information being generated based on the priority of the at least one measurement; determining a pattern for controlling the at least one measurement based on the control information; and performing the at least one measurement based on the pattern.
In a fifth aspect, there is provided an apparatus comprises means for determining, at a first device, a priority of at least one measurement of radio resource management to be performed by a second device; means for generating control information for the at least one measurement based on the priority; and means for transmitting the control information to the second device.
In a sixth aspect, there is provided an apparatus comprises means for receiving, from a first device, control information at least one measurement of radio resource management to be performed by a second device, the control information being generated based on the priority of the at least one measurement; means for determining a pattern for controlling the at least one measurement based on the control information; and means for performing the at least one measurement based on the pattern.
In a seventh aspect, there is provided a computer readable medium having a  computer program stored thereon which, when executed by at least one processor of a device, causes the device to carry out the method according to the third aspect.
In an eighth aspect, there is provided a computer readable medium having a computer program stored thereon which, when executed by at least one processor of a device, causes the device to carry out the method according to the fourth aspect.
Other features and advantages of the embodiments of the present disclosure will also be apparent from the following description of specific embodiments when read in conjunction with the accompanying drawings, which illustrate, by way of example, the principles of embodiments of the disclosure.
BRIEF DESCRIPTION OF THE DRAWINGS
Embodiments of the disclosure are presented in the sense of examples and their advantages are explained in greater detail below, with reference to the accompanying drawings, where
FIG. 1 shows an example communication network in which example embodiments of the present disclosure may be implemented;
FIG. 2 shows a schematic diagram illustrating a process of power control for the measurement of RRM according to example embodiments of the present disclosure;
FIG. 3 shows a flowchart of an example method 300 of power control for the measurement of RRM according to some example embodiments of the present disclosure;
FIG. 4 shows a flowchart of an example method 400 of power control for the measurement of RRM according to some example embodiments of the present disclosure;
FIG. 5 shows a simplified block diagram of a device that is suitable for implementing example embodiments of the present disclosure; and
Fig. 6 shows a block diagram of an example computer readable medium in accordance with some embodiments of the present disclosure.
Throughout the drawings, the same or similar reference numerals represent the same or similar element.
DETAILED DESCRIPTION
The subject matter described herein will now be discussed with reference to several example embodiments. It should be understood these embodiments are discussed only for the purpose of enabling those skilled persons in the art to better understand and thus implement the subject matter described herein, rather than suggesting any limitations on the scope of the subject matter.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments. As used herein, the singular forms “a, ” “an” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms “comprises, ” “comprising, ” “includes” and/or “including, ” when used herein, specify the presence of stated features, integers, steps, operations, elements and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and/or groups thereof.
It should also be noted that in some alternative implementations, the functions/acts noted may occur out of the order noted in the figures. For example, two functions or acts shown in succession may in fact be executed concurrently or may sometimes be executed in the reverse order, depending upon the functionality/acts involved.
As used herein, the term “communication network” refers to a network following any suitable communication standards, such as Long Term Evolution (LTE) , LTE-Advanced (LTE-A) , Wideband Code Division Multiple Access (WCDMA) , High-Speed Packet Access (HSPA) , New Radio (NR) and so on. Furthermore, the communications between a terminal device and a network device in the communication network may be performed according to any suitable generation communication protocols, including, but not limited to, the first generation (1G) , the second generation (2G) , 2.5G, 2.75G, the third generation (3G) , the fourth generation (4G) , 4.5G, the future fifth generation (5G) communication protocols, and/or any other protocols either currently known or to be developed in the future.
Embodiments of the present disclosure may be applied in various communication systems. Given the rapid development in communications, there will of course also be future type communication technologies and systems with which the present disclosure may be embodied. It should not be seen as limiting the scope of the present disclosure to only the aforementioned system. For the purpose of illustrations, embodiments of the  present disclosure will be described with reference to 5G communication system.
The term “network device” used herein includes, but not limited to, a base station (BS) , a gateway, a registration management entity, and other suitable device in a communication system. The term “base station” or “BS” represents a node B (NodeB or NB) , an evolved NodeB (eNodeB or eNB) , a New Radio (NR) NB (also referred to as a gNB) , a Remote Radio Unit (RRU) , a radio header (RH) , a remote radio head (RRH) , a relay, a low power node such as a femto, a pico, and so forth.
The term “terminal device” used herein includes, but not limited to, “user equipment (UE) ” and other suitable end device capable of communicating with the network device. By way of example, the “terminal device” may refer to a terminal, a Mobile Terminal (MT) , a Subscriber Station (SS) , a Portable Subscriber Station, a Mobile Station (MS) , or an Access Terminal (AT) .
The term “circuitry” used herein may refer to one or more or all of the following:
(a) hardware-only circuit implementations (such as implementations in only analog and/or digital circuitry) and
(b) combinations of hardware circuits and software, such as (as applicable) :
(i) a combination of analog and/or digital hardware circuit (s) with
software/firmware and
(ii) any portions of hardware processor (s) with software (including digital signal processor (s) ) , software, and memory (ies) that work together to cause an apparatus, such as a mobile phone or server, to perform various functions) and
(c) hardware circuit (s) and or processor (s) , such as a microprocessor (s) or a portion of a microprocessor (s) , that requires software (e.g., firmware) for operation, but the software may not be present when it is not needed for operation. ”
This definition of circuitry applies to all uses of this term in this application, including in any claims. As a further example, as used in this application, the term circuitry also covers an implementation of merely a hardware circuit or processor (or multiple processors) or portion of a hardware circuit or processor and its (or their) accompanying software and/or firmware. The term circuitry also covers, for example and if applicable to the particular claim element, a baseband integrated circuit or processor integrated circuit for a mobile device or a similar integrated circuit in server, a cellular network device, or other  computing or network device.
FIG. 1 shows an example communication network 100 in which embodiments of the present disclosure can be implemented. The network 100 includes a first device 110 (hereinafter may be referred as to a network device 110) and second devices 120-1 and 120-2 (hereinafter collectively referred to as second devices 120 or individually referred to as a terminal device 120) served by the network device 110. The serving area of the network device 110 is called as a cell 102. It is to be understood that the number of network devices and terminal devices is only for the purpose of illustration without suggesting any limitations. The network 100 may include any suitable number of network devices and terminal devices adapted for implementing embodiments of the present disclosure. Although not shown, it would be appreciated that one or more terminal devices may be in the cell 102 and served by the network device 110.
The communications in the network 100 may conform to any suitable standards including, but not limited to, New Radio (NR) , Long Term Evolution (LTE) , LTE-Evolution, LTE-Advanced (LTE-A) , Wideband Code Division Multiple Access (WCDMA) , Code Division Multiple Access (CDMA) and Global System for Mobile Communications (GSM) and the like. Furthermore, the communications may be performed according to any generation communication protocols either currently known or to be developed in the future. Examples of the communication protocols include, but not limited to, the first generation (1G) , the second generation (2G) , 2.5G, 2.75G, the third generation (3G) , the fourth generation (4G) , 4.5G, the fifth generation (5G) communication protocols.
As mention above, one of the most important steps for handover is the measurement report of RRM from terminal device before the handover. The network device may make a handover decision for the terminal device based on the measurement value from terminal device. There are many different measurement items and many different ways to measure the signal quality of the serving cell and candidate cell.
The five basic RRM measurements in LTE system are CQI, RSRP, RSRQ, RS-SINR and RSSI. For NR, it is expected that the power saving for the terminal device will be further developed. For example, a new object was added for network-configured measurement relaxation.
The objective of the terminal device power saving may include the following: network-configured mechanism may be specified to relax intra and inter-frequency RRM  measurement for neighbour cells for RRC_IDLE/INACTIVE with minimal mobility performance impacts.
Currently, the proposals for power saving of the terminal device only focus on network-configured Enable/Disable indication or threshold to control the RRM measurement relaxation of the terminal device. For example, when the network device indicates “Enabling” to the terminal device, the terminal device may drop any configured intra-f, inter-f or inter-RAT measurement to reduce power consumption. Vice versa, indicated “Disabling” means the terminal device is not allowed to drop any measurements for power saving intention.
Furthermore, the network device may configure one predetermined threshold of a specific RRM measurement, such as RSRP, RSPQ, RS-SINR or RSSI to the terminal device. When the terminal device measures the value of the specific RRM measurement is better than the threshold, some configured measurements will be dropped in the terminal device side for power saving, as in such situation the terminal device may be located at the cell central area and lack possibility to do handover. In this case, the mobility status of the terminal device (e.g. stationary or fast-moving) will be considered as well.
These proposed mechanisms can be configured terminal devices by System Information Blocks (SIBs) to control all terminal devices with the capability in whole cell or by dedicated signaling to control one specific terminal device with the capability. Even having such network controlling, when the criteria is determined to be met in the terminal device, which measurement will be dropped is fully decided by the terminal device itself. In some cases, the terminal device may drop some important measurements by itself for power saving, but this may not be the expected behavior from the network as such measurements are configured with special intention, e.g., targeting for load balancing, Space Frequency Transmit Diversity (SFTD) measurement for time difference detection, or Cell Global Identifier (CGI) reporting for Automatic Neighbor Relation (ANR) .
It has been proposed that for co-site deployed intra-band frequencies criteria, the number of measured frequencies can be reduced in inter-frequency RRM measurement relaxation. Furthermore, for inter-frequency RRM measurement reduction, the measured frequency group and association relationship between the measured frequencies can be indicated to the terminal device in system information or measurement configuration information, and the terminal device can randomly select one of the frequency layers in the  same group to perform RRM measurement.
Moreover, it is proposed that to enable early solutions in the field, enabling reduced measurement effort and burden of the terminal device, while still maintaining network deployment flexibility, the network device may indicate to the terminal device any carrier aggregation Component Carrier (CC) collocation information. That is, the network device will indicate to the terminal device if the terminal device can assume same channel conditions for CC (e.g. intra-band CCs) and therefore the terminal device would be allowed to relax measurements requirements on some CCs compared to the main CC.
An approach has been proposed to enable the terminal device to perform the relaxed RRM measurement up to network enable or when the condition configured by network is satisfied. An “enabling” indication solution for power saving is proposed.
Further, it has been proposed that number of measured intra-frequency cells should be reduced for power saving of the terminal device in NR. For example, an additional threshold can be introduced to reduce the number of intra-frequency measurements based on S-measure enhancement.
However, none of the conventional approaches suggest a network controlled power saving mechanism for the terminal device, to ensure that the terminal device will not drop any important measurement objects on one hand and reduce the power consumption while maintaining the mobility performance and the network load balancing on the other hand.
Therefore, the embodiments of the present disclosure propose a network controlled mechanism for the RRM measurement of the terminal device. The network device may generate the control information for the RRM measurement base on the priority of the measurements. The priority may be associated with the attributes of the measurements or a desired power consumption level of the terminal device.
Principle and implementations of the present disclosure will be described in detail below with reference to FIG. 2, which shows a schematic diagram of a process 200 of power control for the measurement of RRM according to example embodiments of the present disclosure. For the purpose of discussion, the process 200 will be described with reference to FIG. 1. The process 200 may involve the network device 110 and the terminal device 120 as illustrated in FIG. 1.
As shown in FIG. 2, the network device 110 determines 210 the priority of at least one RRM measurement to be performed at the terminal device 120.
In some example embodiments, the priority may be associated with at least one attributes of the RRM measurement. For example, the attributes of the RRM measurement may comprise the object of the measurements, the type of the measurements and the identifier of the measurements or a range of frequency to be measured for the at least one measurement. It should be understood that the attributes listed above are only illustrative and will not limit the present disclosure. Any other attributes associated with the RRM measurements will also be considered as the above-mention attributes of measurement.
For example, the priority based on the attributes may indicate, such as, the intra-frequency measurements is more important than the inter-frequency measurements for the terminal device 120.
Furthermore, the attributes may also refer a set of parameters associated with the measurement report. The related parameters may comprise a time period for reporting the measurement result, the trigger event of the report, a CGI or a System Frame Number (SFN) and Frame Timing Difference (SFTD) . It should be understood that the report parameters listed above are only illustrative and will not limit the present disclosure. Any other parameters associated with the report of the measurements will also be considered as the report parameters of measurement.
The network device 110 may determine the priority of the RRM measurements related to at least one above-mentioned attribute of the measurement.
In some example embodiments, the priority may also be associated with the specific power consumption level for the terminal device 120. For example, the network device 110 may determine an expected power consumption level for the terminal device 120 and the power consumption level for each of the RRM measurements to be performed, respectively. Then the network device 110 may determine the priority of the RRM measurement based on the expected power consumption level and the determined power consumption level for each of the RRM measurements.
For example, the expected power consumption level of the terminal device 120 may be represented as a percentage, i.e., 100%power consumption, 50%power consumption or 30%power consumption etc. Correspondingly, the network device 110 may determine the priority of the RRM measurement in a specific level based on the power consumption required for the RRM measurement.
Furthermore, the network device 110 may also determine the time consumed for each of the RRM measurement to be performed at the terminal device 120, because the time that the terminal device spends performing the RRM measurement may affect the power consumption level of the terminal device 120. For example, the measurement which requires the shortest measuring time may have the highest priority to be performed.
After determining the priority, the network device 110 generates the control information for the RRM measurement to be performed at the terminal device 120.
In some example embodiments, the control information may comprise at least one pattern for controlling the at least one measurement. The pattern for controlling the at least one measurement may be determined based on the determined priority related to at least one of the attributes of the RRM measurement and the expected power consumption level.
In some example embodiments, the network device 120 may determine the pattern based on the priority and the attributes. For example, the pattern may indicate an order for dropping the specific measurement, such as which RRM measurement or what kind of RRM measurement can be dropped first and which RRM measurement can be dropped second, etc. For example, the pattern may also indicate which measurements cannot be dropped.
Furthermore, the pattern may also indicate an order for performing the at least one measurement, an order for recovering the dropped at least one measurement or a specific type of measurement to be maintained.
Excepting the examples listed above, it should be understood that the pattern for controlling the measurement can be represented as any form related to the priority, the attributes or the expected power consumption level.
The network device 120 may generate the control information based on the determined pattern. Two example control information may be shown in the following tables.
As an example, if the pattern indicates that the measurement to frequency F1 cannot be dropped. The control information may be represented as below.
TABLE 1: A pattern associated with the MeasObjectNR
Figure PCTCN2019101172-appb-000001
Figure PCTCN2019101172-appb-000002
It can be seen that in a case of MeasObject (ssb Frequency=F1) and the pattern indicating “F1 cannot be dropped” , the control information may include  “PowersavingPriorityInfo” for indicating the specific measurement cannot be dropped.
As another example, if the pattern indicates that all intra-frequency measurements shall be maintained when the terminal device 120 decides to relax measurements. The control information may be represented as below.
TABLE 2: A pattern associated with MeasConfig
Figure PCTCN2019101172-appb-000003
It can be seen that in a case of MeasConfig indicating “Intra-F cannot be dropped” , the control information may include “PowersavingPriorityInfo” for indicating specific RRM measurement cannot be dropped.
In some example embodiments, the control information can be a one-bit indication as the simplest format, e.g. “The measurement object can or cannot be dropped” , “Measurement to FR1 or FR2 can or cannot be dropped” or “Measurement to one reportType can or cannot be dropped. ”
In some example embodiments, the network device 120 may determine the pattern based on the priority and the expected power consumption level related to any of the at least one attribute of RRM measurement, the power consumption level required for RRM measurement and a time interval for performing the RRM measurement. The network device 120 may further generate the control information based on the pattern.
For example, the pattern may indicate an association between the expected power consumption level, the attribute information and the power consumption level required for the RRM measurement. For example, the pattern may also indicate an association between the expected power consumption level, the attribute information and the time interval for performing the RRM measurement.
For example, the pattern may indicate for 30%power consumption, what kind/type measurement should be maintained or dropped. The corresponding control information may be represented as “Level 1 RRM measurement-dropped first, Level 2 RRM measurement-dropped after all Level1 RRM measurements dropped, Level 3 RRM measurement -dropped after all Level 2 measurements dropped. ” The level of the RRM measurement may depends on the determined priority of the measurements.
Example control information may be shown in the following tables. As an example, if the pattern indicates that 50%measurement activity shall be maintained when the terminal device 120 decides to relax measurements. The control information may be represented as below.
TABLE 3: A pattern associated with the MeasConfig
Figure PCTCN2019101172-appb-000004
Figure PCTCN2019101172-appb-000005
It can be seen that in a case of MeasConfig indicating “50%measurement activity” , the control information may include “PowersavingPriorityInfo” for indicating specific RRM measurement cannot be dropped/maintained.
Referring back to FIG. 2, after generating the control information, the network device 110 transmits 220 the control information to the terminal device 120.
In some example embodiments, if the control information is specified for the terminal device 120, the the control information may transmit to the terminal device 120 via Radio Resource Control (RRC) signaling. If the control information is generated for controlling multiple terminal devices, the network device 110 may broadcast the control information.
The terminal device 120 may receive the control information from the network device 110 and determine 230 the pattern for controlling the at least one measurement from the control information.
As an option, the terminal device 120 may determine the order for dropping or maintaining the specific type of the RRM measurements, e.g., “First drop inter-RAT measurements, then drop inter-frequency measurements, and then drop inter-frequency measurements. ”
As another option, the terminal device 120 may determine the time interval for specific type or level of the RRM measurement, e.g., “first increase inter-frequency measurement periodicity to T1 ms, then increase intra-frequency measurement periodicity to T2 ms, then drop inter-frequency measurements and then increase intra-frequency measurement periodicity to T3 ms, but not beyond it. ”
The terminal device 120 may measure RSRP/RSRQ and determine RRM measurement to be performed or dropped based on the measured RSRP/RSRQ and the pattern. For example, the terminal device 120 may be allowed to drop inter-frequency measurements, but only if intra-frequency RSRP lower than a predetermined value.
Furthermore, the terminal device 120 may also determine the pattern for recovering the dropped RRM measurement. For example, the pattern may indicate “first inter-RAT measurements are dropped, then inter-frequency measurements are dropped, i.e. only intra-frequency measurements remain, then inter-frequency layers are measured again when the RSRP of intra-frequency exceeds a predetermined value, e.g. x dBm, and finally, inter-RAT measurements are performed if RSRP of intra-frequency is y dBm (where y > x) . ” In this case, the x and y levels would be different from the criteria levels that triggered the dropping to avoid ping pong effects, i.e. there is a hysteresis between the exit and entry “x” .
Then the terminal device 120 may perform the RRM measurement based on the determined pattern for controlling the at least one measurement.
Furthermore, the network device 110 may adjust the control information according to traffic steering/load, the mobility speed of the terminal device, which means the priority may be changed in different load scenario or different traffic types.
The terminal device 120 may also select the pattern for controlling the at least one measurement based on the required power consumption level, if the pattern, for example, indicate the association between different power consumption levels and corresponding group of measurements.
In this way, the proposed solution of the present disclosure enables network to control that the terminal device does not drop any important measurement objects by itself and can keep necessary measurement to be maintained. Furthermore, this solution also enables power saving of the terminal device by reduced measurements, while also maintaining mobility performance and network load balancing by use of network-controlled prioritized measurements.
Alternatively, besides the power saving controlling between the terminal device and the network device, above mentioned method may also be applied for the power saving controlling between network devices via a suitable signalling.
More details of the example embodiments in accordance with the present disclosure will be described with reference to FIGs. 3-4.
FIG. 3 shows a flowchart of an example method 300 of power control for the measurement of RRM according to some example embodiments of the present disclosure. The method 300 can be implemented at the network device 110 as shown in FIG. 1. For the purpose of discussion, the method 300 will be described with reference to FIG. 1.
At 310, the network device 110 determines a priority of at least one measurement of radio resource management to be performed by the terminal device 120.
In some example embodiments, the network device 110 may obtain at least one attribute of the at least one measurement, comprising at least one of the following: an object of the at least one measurement, a type of the at least one measurement, an identifier of the at least one measurement, a range of frequency for the at least one measurement and parameters associated with a report of the at least one measurement. The network device 110 may determine the priority based on the attribute information.
In some example embodiments, the parameters associated with the report comprises at least one of the following a time period for reporting a result of the at least one measurement, a triggering condition for reporting the result, a Cell Global Identity for the report, and a System Frame Number (SFN) and Frame Timing Difference (SFTD) for the report.
In some example embodiments, the network device 110 may determine a time interval for performing the at least one measurement and an expected power consumption level for the terminal device 120. The network device 110 may also determine the priority based on the time interval and the expected power consumption level.
At 320, the network device 110 generates control information for the at least one measurement based on the priority.
In some example embodiments, the network device 110 may obtain at least one attribute of the at least one measurement. The network device 110 may determine a pattern for controlling the at least one measurement based on the at least one attribute and the priority. The network device 110 may generate the control information based on the pattern.
In some example embodiments, the network device 110 may obtain an expected power consumption level for the terminal device 120. The network device 110 may determine a pattern for controlling the at least one measurement based on the expected power consumption level, the priority and at least one of the following: at least one attribute  of the at least one measurement, a power consumption level required for the at least one measurement; and a time interval for performing the at least one measurement. The network device 110 may also generate the control information based on the pattern.
In some example embodiments, the pattern may comprise at least one of the following an order for performing the at least one measurement, an order for dropping the at least one measurement, an order for recovering the at least one measurement, a first portion of measurements in the at least one measurement to be performed, a time interval for performing the first portion of measurements, a second portion of measurements in the at least one measurement to be dropped, and a time interval for recovering the second portion of measurements, an association between the expected power consumption level, the attribute information and the power consumption level required for the at least one measurement, and an association between the expected power consumption level, the attribute information and the time interval for performing the at least one measurement.
At 330, the network device 110 transmits the control information to the terminal device 120. In some example embodiments.
In some example embodiments, the network device 110 may transmit the control information to the second device via RRC signaling.
In some example embodiments, the network device 110 may broadcast the control information.
FIG. 4 shows a flowchart of an example method 400 of power control for the measurement of RRM according to some example embodiments of the present disclosure. The method 400 can be implemented at the terminal device 120 as shown in FIG. 1. For the purpose of discussion, the method 400 will be described with reference to FIG. 1.
At 410, the terminal device 120 receives, from network device 110, control information at least one measurement of radio resource management to be performed by the second device, the control information being generated based on the priority of the at least one measurement.
At 420, the terminal device 120 determines a pattern for controlling the at least one measurement based on the control information.
At 430, the network device 110 perform the at least one measurement based on the pattern.
In some example embodiments, the pattern may comprise at least one of the following an order for performing the at least one measurement, an order for dropping the at least one measurement, an order for recovering the at least one measurement, a first portion of measurements in the at least one measurement to be performed, a time interval for performing the first portion of measurements, a second portion of measurements in the at least one measurement to be dropped, and a time interval for recovering the second portion of measurements, an association between the expected power consumption level, the attribute information and the power consumption level required for the at least one measurement, and an association between the expected power consumption level, the attribute information and the time interval for performing the at least one measurement.
In some example embodiments, an apparatus capable of performing the method 300 (for example, implemented at the network device 110) may comprise means for performing the respective steps of the method 300. The means may be implemented in any suitable form. For example, the means may be implemented in a circuitry or software module.
In some example embodiments, the apparatus comprises means for determining, at a first device, a priority of at least one measurement of radio resource management to be performed by a second device; means for generating control information for the at least one measurement based on the priority; and means for transmitting the control information to the second device.
In some example embodiments, an apparatus capable of performing the method 400 (for example, implemented at the terminal device 120) may comprise means for performing the respective steps of the method 400. The means may be implemented in any suitable form. For example, the means may be implemented in a circuitry or software module.
In some example embodiments, the apparatus comprises means for receiving, from a first device, control information at least one measurement of radio resource management to be performed by a second device, the control information being generated based on the priority of the at least one measurement; means for determining a pattern for controlling the at least one measurement based on the control information; and means for performing the at least one measurement based on the pattern.
FIG. 5 is a simplified block diagram of a device 500 that is suitable for  implementing embodiments of the present disclosure. The device 500 may be provided to implement the communication device, for example the terminal device 120 and the network device 110 as shown in FIG. 1. As shown, the device 500 includes one or more processors 510, one or more memories 540 coupled to the processor 510, and one or more transmitters and/or receivers (TX/RX) 540 coupled to the processor 510.
The TX/RX 540 is for bidirectional communications. The TX/RX 540 has at least one antenna to facilitate communication. The communication interface may represent any interface that is necessary for communication with other network elements.
The processor 510 may be of any type suitable to the local technical network and may include one or more of the following: general purpose computers, special purpose computers, microprocessors, digital signal processors (DSPs) and processors based on multicore processor architecture, as non-limiting examples. The device 500 may have multiple processors, such as an application specific integrated circuit chip that is slaved in time to a clock which synchronizes the main processor.
The memory 520 may include one or more non-volatile memories and one or more volatile memories. Examples of the non-volatile memories include, but are not limited to, a Read Only Memory (ROM) 524, an electrically programmable read only memory (EPROM) , a flash memory, a hard disk, a compact disc (CD) , a digital video disk (DVD) , and other magnetic storage and/or optical storage. Examples of the volatile memories include, but are not limited to, a random access memory (RAM) 522 and other volatile memories that will not last in the power-down duration.
A computer program 530 includes computer executable instructions that are executed by the associated processor 510. The program 530 may be stored in the ROM 520. The processor 510 may perform any suitable actions and processing by loading the program 530 into the RAM 520.
The embodiments of the present disclosure may be implemented by means of the program 530 so that the device 500 may perform any process of the disclosure as discussed with reference to FIGs. 2 to 4. The embodiments of the present disclosure may also be implemented by hardware or by a combination of software and hardware.
In some embodiments, the program 530 may be tangibly contained in a computer readable medium which may be included in the device 500 (such as in the memory 520) or other storage devices that are accessible by the device 500. The device 500 may load the  program 530 from the computer readable medium to the RAM 522 for execution. The computer readable medium may include any types of tangible non-volatile storage, such as ROM, EPROM, a flash memory, a hard disk, CD, DVD, and the like. Fig. 6 shows an example of the computer readable medium 600 in form of CD or DVD. The computer readable medium has the program 530 stored thereon.
Generally, various embodiments of the present disclosure may be implemented in hardware or special purpose circuits, software, logic or any combination thereof. Some aspects may be implemented in hardware, while other aspects may be implemented in firmware or software which may be executed by a controller, microprocessor or other computing device. While various aspects of embodiments of the present disclosure are illustrated and described as block diagrams, flowcharts, or using some other pictorial representations, it is to be understood that the block, apparatus, system, technique or method described herein may be implemented in, as non-limiting examples, hardware, software, firmware, special purpose circuits or logic, general purpose hardware or controller or other computing devices, or some combination thereof.
The present disclosure also provides at least one computer program product tangibly stored on a non-transitory computer readable storage medium. The computer program product includes computer-executable instructions, such as those included in program modules, being executed in a device on a target real or virtual processor, to carry out the  methods  300 and 400 as described above with reference to FIGs. 3-4. Generally, program modules include routines, programs, libraries, objects, classes, components, data structures, or the like that perform particular tasks or implement particular abstract data types. The functionality of the program modules may be combined or split between program modules as desired in various embodiments. Machine-executable instructions for program modules may be executed within a local or distributed device. In a distributed device, program modules may be located in both local and remote storage media.
Program code for carrying out methods of the present disclosure may be written in any combination of one or more programming languages. These program codes may be provided to a processor or controller of a general purpose computer, special purpose computer, or other programmable data processing apparatus, such that the program codes, when executed by the processor or controller, cause the functions/operations specified in the flowcharts and/or block diagrams to be implemented. The program code may execute entirely on a machine, partly on the machine, as a stand-alone software package, partly on  the machine and partly on a remote machine or entirely on the remote machine or server.
In the context of the present disclosure, the computer program codes or related data may be carried by any suitable carrier to enable the device, apparatus or processor to perform various processes and operations as described above. Examples of the carrier include a signal, computer readable medium, and the like.
The computer readable medium may be a computer readable signal medium or a computer readable storage medium. A computer readable medium may include but not limited to an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. More specific examples of the computer readable storage medium would include an electrical connection having one or more wires, a portable computer diskette, a hard disk, a random access memory (RAM) , a read-only memory (ROM) , an erasable programmable read-only memory (EPROM or Flash memory) , an optical fiber, a portable compact disc read-only memory (CD-ROM) , an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
Further, while operations are depicted in a particular order, this should not be understood as requiring that such operations be performed in the particular order shown or in sequential order, or that all illustrated operations be performed, to achieve desirable results. In certain circumstances, multitasking and parallel processing may be advantageous. Likewise, while several specific implementation details are contained in the above discussions, these should not be construed as limitations on the scope of the present disclosure, but rather as descriptions of features that may be specific to particular embodiments. Certain features that are described in the context of separate embodiments may also be implemented in combination in a single embodiment. Conversely, various features that are described in the context of a single embodiment may also be implemented in multiple embodiments separately or in any suitable sub-combination.
Although the present disclosure has been described in languages specific to structural features and/or methodological acts, it is to be understood that the present disclosure defined in the appended claims is not necessarily limited to the specific features or acts described above. Rather, the specific features and acts described above are disclosed as example forms of implementing the claims.

Claims (32)

  1. A first device comprising:
    at least one processor; and
    at least one memory including computer program codes;
    the at least one memory and the computer program codes are configured to, with the at least one processor, cause the first device at least to:
    determine a priority of at least one measurement of radio resource management to be performed by a second device;
    generate control information for the at least one measurement based on the priority; and
    transmit the control information to the second device.
  2. The first device of Claim 1, wherein the first device is caused to determine the priority by:
    obtaining at least one attribute of the at least one measurement, comprising at least one of the following:
    an object of the at least one measurement,
    a type of the at least one measurement,
    an identifier of the at least one measurement,
    a range of frequency for the at least one measurement, and
    parameters associated with a report of the at least one measurement; and
    determining the priority based on the attribute information.
  3. The first device of Claim 2, wherein the parameters associated with the report comprises at least one of the following:
    a time period for reporting a result of the at least one measurement,
    a triggering condition for reporting the result,
    a Cell Global Identity for the report, and
    a System Frame Number (SFN) and Frame Timing Difference (SFTD) for the report.
  4. The first device of Claim 1, wherein the first device is caused to determine the priority by:
    determining a power consumption level required for the at least one measurement;
    determining an expected power consumption level for the second device; and
    determining the priority based on the required power consumption level and the expected power consumption level.
  5. The first device of Claim 1, wherein the first device is caused to determine the priority by:
    determining a time interval for performing the at least one measurement;
    determining an expected power consumption level for the second device; and
    determining the priority based on the time interval and the expected power consumption level.
  6. The first device of Claim 1, wherein the first device is caused to generate the control information by:
    obtaining at least one attribute of the at least one measurement;
    determining a pattern for controlling the at least one measurement based on the at least one attribute and the priority; and
    generating the control information based on the pattern.
  7. The first device of Claim 1, wherein the first device is caused to generate the control information by:
    obtaining an expected power consumption level for the second device;
    determining a pattern for controlling the at least one measurement based on the expected power consumption level, the priority and at least one of the following:
    at least one attribute of the at least one measurement,
    a power consumption level required for the at least one measurement; and
    a time interval for performing the at least one measurement; and
    generating the control information based on the pattern.
  8. The first device of Claim 6 or 7, wherein the pattern at least comprises at least one of the following:
    an order for performing the at least one measurement,
    an order for dropping the at least one measurement,
    an order for recovering the at least one measurement,
    a first portion of measurements in the at least one measurement to be performed,
    a time interval for performing the first portion of measurements,
    a second portion of measurements in the at least one measurement to be dropped, and
    a time interval for recovering the second portion of measurements,
    an association between the expected power consumption level, the attribute information and the power consumption level required for the at least one measurement, and
    an association between the expected power consumption level, the attribute information and the time interval for performing the at least one measurement.
  9. The first device of Claim 1, wherein the first device is caused to transmit the control information by:
    transmitting the control information to the second device via dedicated command or signaling.
  10. The first device of Claim 1, wherein the first device is further caused to:
    broadcast the control information.
  11. The first device of any of Claims 1-10, wherein the first device is a network device and the second device is a terminal device or a further network device.
  12. A second device comprising:
    at least one processor; and
    at least one memory including computer program codes;
    the at least one memory and the computer program codes are configured to, with the at least one processor, cause the second device at least to:
    receive, from a first device, control information at least one measurement of radio resource management to be performed by the second device, the control information being generated based on the priority of the at least one measurement;
    determine a pattern for controlling the at least one measurement based on the control information; and
    perform the at least one measurement based on the pattern.
  13. The second device of Claim 12, wherein the pattern comprises at least one of the following:
    an order for performing the at least one measurement,
    an order for dropping the at least one measurement,
    an order for recovering the at least one measurement,
    a first portion of measurements in the at least one measurement to be performed,
    a time interval for performing the first portion of measurements,
    a second portion of measurements in the at least one measurement to be dropped, and
    a time interval for recovering the second portion of measurements,
    an association between the expected power consumption level, the attribute information and the power consumption level required for the at least one measurement, and
    an association between the expected power consumption level, the attribute information and the time interval for performing the at least one measurement.
  14. The second device of Claim 12 or 13, wherein the first device is a network device and the second device is a terminal device or a further network device.
  15. A method comprising:
    determining, at a first device, a priority of at least one measurement of radio resource management to be performed by a second device;
    generating control information for the at least one measurement based on the priority; and
    transmitting the control information to the second device.
  16. The method of Claim 15, wherein determining the priority comprises:
    obtaining at least one attribute of the at least one measurement, comprising at least one of the following:
    an object of the at least one measurement,
    a type of the at least one measurement,
    an identifier of the at least one measurement,
    a range of frequency for the at least one measurement, and
    parameters associated with a report of the at least one measurement; and
    determining the priority based on the attribute information.
  17. The method of Claim 16, wherein the parameters associated with the report comprises at least one of the following:
    a time period for reporting a result of the at least one measurement,
    a triggering condition for reporting the result,
    a Cell Global Identity for the report, and
    a System Frame Number (SFN) and Frame Timing Difference (SFTD) for the report.
  18. The method of Claim 15, wherein determining the priority comprises:
    determining a power consumption level required for the at least one measurement;
    determining an expected power consumption level for the second device; and
    determining the priority based on the required power consumption level and the expected power consumption level.
  19. The method of Claim 15, wherein determining the priority comprises:
    determining a time interval for performing the at least one measurement;
    determining an expected power consumption level for the second device; and
    determining the priority based on the time interval and the expected power consumption level.
  20. The method of Claim 15, wherein generating the control information comprises:
    obtaining at least one attribute of the at least one measurement;
    determining a pattern for controlling the at least one measurement based on the at least one attribute and the priority; and
    generating the control information based on the pattern.
  21. The method of Claim 15, wherein generating the control information comprises:
    obtaining an expected power consumption level for the second device;
    determining a pattern for controlling the at least one measurement based on the expected power consumption level, the priority and at least one of the following:
    at least one attribute of the at least one measurement,
    a power consumption level required for the at least one measurement; and
    a time interval for performing the at least one measurement; and
    generating the control information based on the pattern.
  22. The method of Claim 20 or 21, wherein the pattern comprises at least one of the following:
    an order for performing the at least one measurement,
    an order for dropping the at least one measurement,
    an order for recovering the at least one measurement,
    a first portion of measurements in the at least one measurement to be performed,
    a time interval for performing the first portion of measurements,
    a second portion of measurements in the at least one measurement to be dropped, and
    a time interval for recovering the second portion of measurements,
    an association between the expected power consumption level, the attribute information and the power consumption level required for the at least one measurement, and
    an association between the expected power consumption level, the attribute information and the time interval for performing the at least one measurement.
  23. The method of Claim 15, wherein transmitting the control information comprises:
    transmitting the control information to the second device via Radio Resource Control, RRC signaling.
  24. The method of Claim 15, further comprising:
    broadcasting the control information.
  25. The method of any of Claims 15-24, wherein the first device is a network device and the second device is a terminal device or a further network device.
  26. A method comprising:
    receiving, from a first device, control information at least one measurement of  radio resource management to be performed by a second device, the control information being generated based on the priority of the at least one measurement;
    determining a pattern for controlling the at least one measurement based on the control information; and
    performing the at least one measurement based on the pattern.
  27. The method of Claim 26, wherein the pattern comprises at least one of the following:
    an order for performing the at least one measurement,
    an order for dropping the at least one measurement,
    an order for recovering the at least one measurement,
    a first portion of measurements in the at least one measurement to be performed,
    a time interval for performing the first portion of measurements,
    a second portion of measurements in the at least one measurement to be dropped, and
    a time interval for recovering the second portion of measurements,
    an association between the expected power consumption level, the attribute information and the power consumption level required for the at least one measurement, and
    an association between the expected power consumption level, the attribute information and the time interval for performing the at least one measurement.
  28. The method of Claim 26 or 27, wherein the first device is a network device and the second device is a terminal device or a further network device.
  29. An apparatus comprising:
    means for determining, at a first device, a priority of at least one measurement of radio resource management to be performed by a second device;
    means for generating control information for the at least one measurement based on the priority; and
    means for transmitting the control information to the second device.
  30. An apparatus comprising:
    means for receiving, from a first device, control information at least one  measurement of radio resource management to be performed by a second device, the control information being generated based on the priority of the at least one measurement;
    means for determining a pattern for controlling the at least one measurement based on the control information; and
    means for performing the at least one measurement based on the pattern.
  31. A non-transitory computer readable medium comprising program instructions for causing an apparatus to perform at least the method of any of claims 15-25.
  32. A non-transitory computer readable medium comprising program instructions for causing an apparatus to perform at least the method of any of claims 26-28.
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