WO2018090376A1 - Adaptive synchronization - Google Patents

Adaptive synchronization Download PDF

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Publication number
WO2018090376A1
WO2018090376A1 PCT/CN2016/106622 CN2016106622W WO2018090376A1 WO 2018090376 A1 WO2018090376 A1 WO 2018090376A1 CN 2016106622 W CN2016106622 W CN 2016106622W WO 2018090376 A1 WO2018090376 A1 WO 2018090376A1
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WIPO (PCT)
Prior art keywords
quality
signal
synchronization information
detecting
synchronization
Prior art date
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PCT/CN2016/106622
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French (fr)
Inventor
Liyuan Liu
Jian Li
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Microsoft Technology Licensing, Llc.
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Publication date
Application filed by Microsoft Technology Licensing, Llc. filed Critical Microsoft Technology Licensing, Llc.
Priority to PCT/CN2016/106622 priority Critical patent/WO2018090376A1/en
Publication of WO2018090376A1 publication Critical patent/WO2018090376A1/en

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    • G—PHYSICS
    • G08—SIGNALLING
    • G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
    • G08C17/00—Arrangements for transmitting signals characterised by the use of a wireless electrical link
    • G08C17/02—Arrangements for transmitting signals characterised by the use of a wireless electrical link using a radio link

Definitions

  • a device When a device is to communicate with another device, it first synchronizes to the other device. In particular, the device attempts to receive synchronization information on channels, such as Frequency Correction Channels (FCCH) , Synchronization Channels (SCH) , Broadcast Control Channel (BCCH) , and so on. For example, the device performs partial detections for a predefined number of times to obtain the synchronization information. However, for those devices under poor radio coverage, the synchronization information may not be detected successfully due to the poor signal quality. As a result, synchronization between the devices would be failed, which leads to undesired call failure, voice distortion, loss of voice call, and so on.
  • FCCH Frequency Correction Channels
  • SCH Synchronization Channels
  • BCCH Broadcast Control Channel
  • a device determines, upon receipt of a signal for synchronization from another device, a quality of the signal.
  • the quality of the signal is used in adjusting the number of times for detecting the synchronization information from the signal. In this way, the possibility of successfully detecting the synchronization information can be improved. As a result, high-qualified radio synchronization can be guaranteed, even when the device is under poor radio coverage.
  • Fig. 1 is a graph illustrating a multi-frame structure for detecting synchronization information in accordance with an example implementation of the subject matter described herein;
  • FIG. 2 is a flowchart illustrating a method for performing adaptive synchronization in accordance with an example implementation of the subject matter described herein;
  • FIG. 3 is a flowchart illustrating a method for performing adaptive synchronization in accordance with another example implementation of the subject matter described herein;
  • Fig. 4 is a block diagram of a device suitable for implementing one or more implementations of the subject matter described herein.
  • the term “include” and its variants are to be read as open terms that mean “include, but is not limited to” .
  • the term “based on” is to be read as “based at least in part on” .
  • the term “a” is to be read as “one or more” unless otherwise specified.
  • the term “one implementation” and “an implementation” are to be read as “at least one implementation” .
  • the term “another implementation” is to be read as “at least one other implementation” .
  • the terms “first” , “second” and the like are used to indicate individual elements or components, without suggesting any limitation as to the order of these elements. Further, a first element may or may not be the same as a second element.
  • the phrases “quality of signal” and “signal quality” can be used interchangeably. Other definitions, explicit and implicit, may be included below.
  • synchronization information such as information carried on a FCCH, SCH, BCCH, Paging Channel (PCH) , Access Grant Channel (AGCH) , Slow Associated Control Channel (SACCH) , Stand-Alone Dedicated Control Channel (SDCCH) , Fast Associated Control Channel (FACCH) , and the like is important for synchronization of communications between devices, especially for initial synchronization, information updating, handover of cells, and so on.
  • a device usually attempts to detect the synchronization information within a predefined number of times.
  • the possibility of successful detection of the synchronization information within the predefined number of times would be rather low. As such, the synchronization between the devices would be failed.
  • Fig. 1 is a graph illustrating a multi-frame structure for detecting synchronization information in accordance with an example implementation of the subject matter described herein. It is to be understood that any specific number shown in Fig. 1 as well as other figures are only for illustration, without suggesting any limitations as to the scope of the subject matter described herein.
  • the predefined number of times for detecting the synchronization information is five (5) . That is, a device is allowed to detect the synchronization information at most 5 times. If the device fails to detect the synchronization information for 5 times, the synchronization is failed.
  • five frames 101 to 105 are shown, each of which includes 10 slots.
  • the first slot of each frame such as 110, 111, 112, 113 and 114 carry FCCH
  • the second slot of a frame such as 120, 121, 122, 123 and 124 carry SCH, for example.
  • FCCH information information carried by FCCH
  • the device may continue the detection at slot 111, and then slot 112, slot 113 and slot 114.
  • the device cannot detect the FCCH information at any of the five slots 110 to 114.
  • the synchronization fails.
  • the device successfully detects the FCCH information at slot 110 but cannot obtain SCH information at any of slots 120 to 124 the synchronization fails.
  • radio functions such as radio connection and call generation would not work well, and audio loss or distortion would occur.
  • a new method and device for adaptive frequency calibration are provided herein.
  • a device during synchronization with a further device, determines a quality of a signal received from the further device, and adjusts the number of times for detecting synchronization information from the signal based on the quality of the signal.
  • an adaptive number of times associated with the signal quality can be applied to the detection of the synchronization information.
  • the device may perform the synchronization in consideration of the signal quality. In this way, the possibility of successful synchronization between the two devices can be improved. As a result, high-qualified radio synchronization and connection can be guaranteed, even when the device is under poor radio coverage.
  • a device referred to as “a first device” hereafter
  • a second device referred to as “a second device” hereafter
  • the devices may be implemented in a variety of ways.
  • either the first device or the second device may be a network device or a terminal device.
  • a network device refers to a device in a communication network, from which a terminal device may receive services.
  • the network device may be a base station (BS) , an access point (AP) , a server or any other suitable device in the communication network.
  • the BS may be, for example, a node B (NodeB or NB) , an evolved NodeB (eNodeB or eNB) , 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
  • 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.
  • a terminal device refers to any end device that can communicate with the network device and receive services from communication a network.
  • the terminal device refers to a mobile terminal, user equipment (UE) , or other suitable device.
  • the UE may be, for example, a Subscriber Station (SS) , a Portable Subscriber Station, a Mobile Station (MS) , or an Access Terminal (AT) .
  • the terminal device may include, but not limited to, a mobile phone, a cellular phone, a smart phone, a laptop computer, a tablet, a personal digital assistant (PDA) , a vehicle, and the like.
  • PDA personal digital assistant
  • the first and second devices may operate in a communication network.
  • 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) , and so on.
  • LTE Long Term Evolution
  • LTE-A LTE-Advanced
  • WCDMA Wideband Code Division Multiple Access
  • HSPA High-Speed Packet Access
  • the communications between devices 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.
  • Fig. 2 is a flowchart illustrating a method 200 for performing adaptive synchronization in accordance with an example implementation of the subject matter described herein.
  • the method 200 is implemented at the first device, for example a terminal device, a network device, or other suitable device.
  • the first device receives a signal from a further device (for example, the second device) for synchronization between the first device and the second device.
  • the signal may include synchronization information carried on broadcast channels, such as FCCH, SCH, BCCH and the like.
  • the first device determines a quality of the received signal.
  • the quality of the signal may be affected by various kinds of interference or noise. For example, when first device is in proximity to a tower or obstructions such as buildings or trees, the signal quality will drop.
  • the first device may determine the signal quality based on a variety of factors associated with the signal. Examples of these factors include, but are not limited to, a signal strength, a power level, a ratio of the power level to the signal strength, a Signal to Noise Ratio (SNR) , a Signal to Interference plus Noise Ratio (SINR) , a Signal to Interference Ratio (SIR) , a Carrier to Noise Ratio (CNR) , a Carrier to Interference plus Noise Ratio (CINR) , a Channel Quality Indicator (CQI) , a carrier frequency, a time duration for synchronization between devices, and so on.
  • SNR Signal to Noise Ratio
  • SINR Signal to Interference plus Noise Ratio
  • SIR Signal to Interference Ratio
  • CNR Carrier to Noise Ratio
  • CINR Carrier to Interference plus Noise Ratio
  • CQI Channel Quality Indicator
  • the first device may determine the signal quality based on the signal strength.
  • the signal strength may be indicated by, for instance, Received Signal Strength Indication (RSSI) . If the RSSI value is high, the first device may determine that the signal quality is good. Otherwise, the first device may determine that the signal quality is poor.
  • RSSI Received Signal Strength Indication
  • the first device may determine the signal quality based on the power level of the signal.
  • the power level may be indicated by, for example, Reference Signal Receiving Power (RSRP) . If the RSRP value is high, the first device may determine that the signal quality is good. Otherwise, the first device may determine that the signal quality is poor.
  • RSRP Reference Signal Receiving Power
  • the first device may determine the signal quality based on the ratio of the power level to the signal strength.
  • the ratio may be indicated by, for example, Reference Signal Receiving Quality (RSRQ) , which may be calculated based on RSRP and RSSI. If the RSRQ value is high, the first device may determine that the signal quality is good. Otherwise, the first device may determine that the signal quality is poor.
  • RSRQ Reference Signal Receiving Quality
  • the CQI may be sent to provide channel quality information including, for example, but not limited in, RSSI, bit error rate (BER) , and so on, to represent a measure of channel quality for transmitting the signal.
  • the first device may determine the quality of the channel based on the CQI.
  • the carrier frequency may indicate a frequency band of the carrier for carrying the signal. If the first device determines that the carrier frequency belongs to a predefined range, for example, an edge of the allocated frequency band, it may determine that the signal may have poor quality since interference at the edge of the allocated frequency band is usually large.
  • the first device may determine the signal quality based on the time duration for synchronization between the first device and the second device.
  • This time duration may indicate a time interval from broadcast channels (for example, FCCH) searching to registration on the second device.
  • the first device may determine that the signal quality is not so good.
  • the first device may determine the signal quality based on SNR, SINR, SIR, CINR, and CNR, alone or in combination. Actually, according to implementations of the subject matter described herein, the first device may determine one of the above factors or any combination thereof as the signal quality. It is to be understood that the above examples factors are only described for purpose of discussion, rather than limitation. Those skilled in the art would appreciate that the first device can determine the signal quality in other suitable ways.
  • the first device adjusts the number of times for detecting synchronization information from the signal based on the signal quality.
  • the device compares the signal quality with a threshold quality.
  • the threshold quality may be predefined in several ways, for example, according to testing results, system requirements, manufacture settings, and the like. If the signal quality is poor, for example, below the threshold quality, the first device may increase the number of times for detecting the synchronization information. As such, the possibility for successfully performing the synchronization can be improved.
  • the number of times may be increased by a fixed, predetermined value.
  • the first device may detect the information one more time.
  • the number of times may be dynamically increased according to one or more relevant factors, such as the quality of the signal, a historical number of times, a system requirement, and the like, alone or in combination.
  • a plurality of candidate numbers of times may be predetermined associated with different signal quality levels, and the first device may increase the number of times as a number of times selected from the candidate numbers of times.
  • the candidate number of times may be determined based on testing data obtained in design or manufacturing of the first device. For example, in a testing process made by a device manufacturer, different signal quality levels may be simulated and applied to the first device. Thus, the corresponding candidate numbers of times that can maintain the possibility of successful detection of the synchronization information to a certain extent may be predetermined.
  • the candidate numbers of times may be determined by the first device itself, for example, when the first device is idle, or in an initialization phase predefined for obtaining the candidate numbers of times.
  • the first device may increase the number of times based on one or more historical numbers of times.
  • the phrase “historical number of times” refers to the number of times that used by the first device in synchronization information detection in the past. It will be appreciated that the historical number of times is usually associated with a signal quality that is determined at the time when the number of times was used.
  • a historical number of times and a corresponding signal quality may be recorded in association.
  • the first device may select, as the adjusted number of times, one of the historical numbers of times whose associated signal quality matches the current signal quality.
  • the first device may determine the number of times based on the system requirements, specification regulations and/or the like.
  • the first device if the signal quality is good enough, for example, exceeding the threshold quality, the first device will maintain the number of times for detecting the synchronization information. As such, power of the first device can be saved.
  • the first device may reduce the number of times for detecting the synchronization information to further save energy.
  • the factors such as the quality of the signal, the historical number (s) of times, a system requirement, and the like can be taken into consideration, alone or in combination.
  • an adaptive mechanism for adjusting the number of times for detecting the synchronization information can be achieved. As a result, the synchronization can be performed in a more efficient way.
  • the number of times for detecting the synchronization information can be adjusted in consideration of the signal quality. Still referring the example of Fig. 1, if the first device cannot detect the FCCH information at any of the five slots 110 to 114 due to the poor quality of the received signal, then the number of times for detecting the FCCH information may be increased to a new value, for example, 8. As such, the first device would have more chances to obtain the FCCH information. In this way, the possibility of successful synchronization between the first and second devices can be improved. As a result, high-qualified radio synchronization and connection can be guaranteed, even when the device is under poor radio coverage.
  • the first device may optionally adjust a configuration of its own receiver based on the signal quality.
  • the configuration of the receiver may be related to, for example, a gain such as an amplification factor of an amplifier of the receiver for amplifying the signal, a reference voltage such as a voltage level acting as a reference of the amplifier, and the like. If the signal quality is poor, the first device may increase the gain of the receiver, increase the reference voltage, or adjust other suitable parameters of the configuration of the receiver. In this way, the synchronization between the first and second devices can be performed in a more adaptive way.
  • the first device may take measures to save power. In such a case, the first device may determine to reduce the gain, the reference voltage, and/or other suitable parameters of configuration of its receiver. In this way, the synchronization can be performed in a more adaptive way and the power of the first device can be saved.
  • the first device may not adjust the occurrence of the next calibration.
  • Fig. 3 is a flowchart 300 illustrating another method for performing adaptive synchronization in accordance with another example implementation of the subject matter described herein. It is to be understood that the method 300, which may be performed by the first device, for example, a terminal device or a network device, can be considered as an example implementation of the method 200.
  • the first device receives a signal from a further device, namely, the second device.
  • the signal may be received at a signal burst and may include synchronization information such as FCCH information, SCH information, BCCH information, and so on.
  • the first device determines quality of the received signal.
  • the quality of the signal may be determined in a variety of ways, as discussed at 220.
  • the first device compares the quality with a threshold quality, and determines whether the quality is less than the threshold quality. If so, the first device may know the quality of the signal is not so good and the number of times for detecting the synchronization can be increased at 340. At 340, the first device increases the number of times for detecting the synchronization information. Then, optionally, the first device may adjust a configuration of its receiver based on the quality of the signal, for example, increasing the gain and/or the reference voltage of the receiver at 350.
  • the first device may determine that the signal quality is good enough and the number of times for detecting the synchronization information can be reduced at 360. Then, optionally, the first device may reduce the gain and/or the reference voltage of the receiver at 370.
  • the first device determines that the signal quality is good enough, it may determine that there is no need to adjust the number of times, or the gain/reference voltage of the receiver. As such, the power of the first device can be reduced.
  • the first device may adaptively perform the synchronization based on the signal quality of the current communication environment. As such, the possibility of successful synchronization can be improved. Furthermore, by reducing the number of times for detecting the synchronization information, the gain of the receiver, and/or the reference voltage of the receiver, power consumption of the first device can be controlled efficiently.
  • Fig. 4 is a block diagram of a device 400 suitable for implementing one or more implementations of the subject matter described herein.
  • the device 400 may function as the first device as discussed above with reference to Figs. 2-3.
  • Description of the device 400 is not intended to suggest any limitation as to scope of use or functionality of the subject matter described herein, as various implementations may be implemented in diverse general-purpose or special-purpose environments.
  • the device 400 includes a controller 420 and a memory 430.
  • the controller 420 may be a real or a virtual processor that is capable of executing a program or computer-executable instructions 440 stored in the memory 430.
  • the memory 430 may be volatile memory (e.g., registers, cache, RAM) , non-volatile memory (e.g., ROM, EEPROM, flash memory) , or some combination thereof.
  • the device 400 further includes a transmitter 405 and a receiver 410.
  • the transmitter 405 and the receiver 410 may be configured by the controller 420 to perform communications with other one or more devices, for example, via an antenna (s) or an antenna array (s) 450.
  • the controller 420 may be configured by the program 440 stored in the memory 430 to work with the receiver 410 to carry out the methods 200 and/or 300 as described above.
  • functionality of the components of the device 400 may be implemented in a single computing machine, for example, a single mobile phone, or in multiple computing machines that are able to communicate over communication connections, for example, a cloud system.
  • the device may perform the synchronization in consideration of the signal quality. As a result, high-qualified radio synchronization and connection can be guaranteed, even when the device is under poor radio coverage.
  • the subject matter described herein may be embodied as a method implemented at a device, for example, the device 400.
  • the method comprises receiving a signal from a further device for synchronization between the device and the further device; determining a quality of the signal; and adjusting, based on the quality, the number of times for detecting synchronization information from the signal
  • the determining a quality of the signal comprises: determining the quality of the signal based on at least one of the following associated with the signal: a signal strength, a power level, a ratio of the power level to the signal strength, a SNR, a SINR, a SIR, a CNR, a CINR, a CQI, a carrier frequency, and a time duration for synchronization between the device and the further device.
  • the adjusting the number of times for detecting synchronization information from the signal comprises: in response to the quality being less than a threshold quality, increasing the number of times for detecting the synchronization information.
  • the increasing the number of times for detecting synchronization information comprises increasing the number of times based on at least one of: the quality of the signal; a historical number of times; and a system requirement.
  • the adjusting the number of times for detecting synchronization information from the signal comprises: in response to the quality exceeding a threshold quality, reducing the number of times for detecting the synchronization information.
  • the reducing the number of times for detecting synchronization information comprises reducing the number of times based on at least one of:the quality of the signal; a historical number of times; and a system requirement.
  • the method may further comprise adjusting, based on the quality of the signal, a configuration of a receiver of the device.
  • the adjusting a configuration of a receiver of the device comprises at least one of: in response to the quality being less than the threshold quality, increasing a gain or a reference voltage of a receiver of the device; and in response to the quality exceeding the threshold quality, reducing the gain or the reference voltage of the receiver.
  • the subject matter described herein can be also embodied as a device.
  • the device comprises: a controller; and a memory coupled to the controller and storing instructions for execution by the controller, the instructions, when executed by the controller, causing the device to perform acts including: receiving a signal from a further device for synchronization between the device and the further device; determining a quality of the signal; and adjusting, based on the quality, the number of times for detecting synchronization information from the signal.
  • the controller is further configured to, determine the quality of the signal based on at least one of the following associated with the signal: a signal strength, a power level, a ratio of the power level to the signal strength, a SNR, a SINR, a SIR, a CNR, a CINR, a CQI, a carrier frequency, and a time duration for synchronization between the device and the further device.
  • the controller is further configured to increase, in response to the quality being less than a threshold quality, the number of times for detecting the synchronization information.
  • the controller is further configured to increase the number of times based on at least one of: the quality of the signal; a historical number of times; and a system requirement.
  • the controller is further configured to reduce, in response to the quality exceeding a threshold quality, the number of times for detecting the synchronization information.
  • the controller is further configured to reduce the number of times based on at least one of: the quality of the signal; a historical number of times; and a system requirement.
  • the controller is further configured to adjust, based on the quality of the signal, a configuration of a receiver of the device.
  • the controller is further configured to, in response to the quality being less than the threshold quality, increase a gain or a reference voltage of a receiver of the device; and/or in response to the quality exceeding the threshold quality, reduce the gain or the reference voltage of the receiver.
  • the controller is further configured to determine an updated error between the first frequency generator and the second frequency generator after the calibration; determine whether the updated error exceeds an error threshold; and in response to determining that the updated error exceeds the error threshold, reduce a time interval between the first time point and a second time point when a next calibration begins.
  • the controller is further configured to, in response to determining that the updated error being less than the error threshold, increase the time interval between the first time point and the second time point.
  • the subject matter described herein may be embodied as a computer program product being tangibly stored on a non-transient machine-readable medium and comprising machine-executable instructions.
  • the instructions when executed by a device, cause the device to: receive a signal from a further device for synchronization between the device and the further device; determine a quality of the signal; and adjust, based on the quality, the number of times for detecting synchronization information from the signal
  • the instructions when executed by the device, further cause the device to: determine the quality of the signal based on at least one of the following associated with the signal: a signal strength, a power level, a ratio of the power level to the signal strength, a SNR, a SINR, a SIR, a CNR, a CINR, a CQI, a carrier frequency, and a time duration for synchronization between the device and the further device.
  • the instructions when executed by the device, further cause the device to: in response to the quality being less than a threshold quality, increase the number of times for detecting the synchronization information.
  • the instructions when executed by the device, further cause the device to: increase the number of times based on at least one of: the quality of the signal; a historical number of times; and a system requirement.
  • the instructions when executed by the device, further cause the device to: in response to the quality exceeding a threshold quality, reduce the number of times for detecting the synchronization information.
  • the instructions when executed by the device, further cause the device to: reduce the number of times based on at least one of: the quality of the signal; a historical number of times; and a system requirement.
  • the instructions when executed by the device, further cause the device to: adjust, based on the quality of the signal, a configuration of a receiver of the device.
  • the instructions when executed by the device, further cause the device to: in response to the quality being less than the threshold quality, increase a gain or a reference voltage of a receiver of the device; and/or in response to the quality exceeding the threshold quality, reduce the gain or the reference voltage of the receiver.
  • Implementations of the subject matter described herein may further include one or more computer program products being tangibly stored on a non-transient machine-readable medium and comprising machine-executable instructions.
  • the instructions when executed on a device, causing the device to carry out one or more processes as described above.
  • Example implementations 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 the example implementations of the subject matter described herein are illustrated and described as block diagrams, flowcharts, or using some other pictorial representation, it will be appreciated that the blocks, apparatus, systems, techniques or methods 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.
  • a machine readable medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.
  • the machine readable medium may be a machine readable signal medium or a machine readable storage medium.
  • a machine 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.
  • machine readable storage medium More specific examples of the machine 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.
  • RAM random access memory
  • ROM read-only memory
  • EPROM or Flash memory erasable programmable read-only memory
  • CD-ROM portable compact disc read-only memory
  • magnetic storage device or any suitable combination of the foregoing.
  • Computer program code for carrying out methods of the subject matter described herein may be written in any combination of one or more programming languages. These computer program codes may be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus, such that the program codes, when executed by the processor of the computer or other programmable data processing apparatus, cause the functions or operations specified in the flowcharts and/or block diagrams to be implemented.
  • the program code may execute entirely on a computer, partly on the computer, as a stand-alone software package, partly on the computer and partly on a remote computer or entirely on the remote computer or server.

Abstract

According to implementations of the subject matter described herein, a new approach for adaptively calibrating frequency is proposed herein. Generally speaking, a device determines, upon receipt of a signal for synchronization from another device, a quality of the signal. Then, the device adjusts the number of times for detecting the synchronization information from the signal based on the quality. In this way, the possibility of successfully detecting the synchronization information can be improved. As a result, high-qualified radio synchronization can be guaranteed, even when the device is under poor radio coverage.

Description

ADAPTIVE SYNCHRONIZATION BACKGROUND
When a device is to communicate with another device， it first synchronizes to the other device. In particular， the device attempts to receive synchronization information on channels， such as Frequency Correction Channels (FCCH) ， Synchronization Channels (SCH) ， Broadcast Control Channel (BCCH) ， and so on. For example， the device performs partial detections for a predefined number of times to obtain the synchronization information. However， for those devices under poor radio coverage， the synchronization information may not be detected successfully due to the poor signal quality. As a result， synchronization between the devices would be failed， which leads to undesired call failure， voice distortion， loss of voice call， and so on.
SUMMARY
Generally speaking， a new approach for adaptive synchronization between devices is proposed herein. In accordance with implementations of the subject matter described herein， a device determines， upon receipt of a signal for synchronization from another device， a quality of the signal. The quality of the signal is used in adjusting the number of times for detecting the synchronization information from the signal. In this way， the possibility of successfully detecting the synchronization information can be improved. As a result， high-qualified radio synchronization can be guaranteed， even when the device is under poor radio coverage.
It is to be understood that the Summary is not intended to identify key or essential features of implementations of the subject matter described herein， nor is it intended to be used to limit the scope of the subject matter described herein. Other features of the subject matter described herein will become easily comprehensible through the description below.
BRIEF DESCRIPTION OF THE DRAWINGS
The details of one or more implementations of the subject matter described  herein are set forth in the accompanying drawings and the description below. Other features， aspects， and advantages of the disclosure will become apparent from the description， the drawings， and the claims， wherein：
Fig. 1 is a graph illustrating a multi-frame structure for detecting synchronization information in accordance with an example implementation of the subject matter described herein；
Fig. 2 is a flowchart illustrating a method for performing adaptive synchronization in accordance with an example implementation of the subject matter described herein；
Fig. 3 is a flowchart illustrating a method for performing adaptive synchronization in accordance with another example implementation of the subject matter described herein； and
Fig. 4 is a block diagram of a device suitable for implementing one or more implementations of the subject matter described herein.
Throughout the figures， same or similar reference numbers will always indicate same or similar elements.
DETAILED DESCRIPTION
Principle of the subject matter described herein will now be described with reference to some example implementations. It is to be understood that these implementations are described only for the purpose of illustration and help those skilled in the art to understand and implement the subject matter described herein， without suggesting any limitations as to the scope of the disclosure. The disclosure described herein can be implemented in various manners other than the ones describe below.
As used herein， the term “include” and its variants are to be read as open terms that mean “include， but is not limited to” . The term “based on” is to be read as “based at least in part on” . The term “a” is to be read as “one or more” unless otherwise specified. The term “one implementation” and “an implementation” are to be read as “at least one implementation” . The term “another implementation” is to be read as “at least one other implementation” . Moreover， it is to be understood that in the context of the subject  matter described herein， the terms “first” ， “second” and the like are used to indicate individual elements or components， without suggesting any limitation as to the order of these elements. Further， a first element may or may not be the same as a second element. In addition， in this context， the phrases “quality of signal” and “signal quality” can be used interchangeably. Other definitions， explicit and implicit， may be included below.
Conventionally， synchronization information， such as information carried on a FCCH， SCH， BCCH， Paging Channel (PCH) ， Access Grant Channel (AGCH) ， Slow Associated Control Channel (SACCH) ， Stand-Alone Dedicated Control Channel (SDCCH) ， Fast Associated Control Channel (FACCH) ， and the like is important for synchronization of communications between devices， especially for initial synchronization， information updating， handover of cells， and so on. A device usually attempts to detect the synchronization information within a predefined number of times. In some cases， if the device is under poor radio coverage， such as， impacted by radio signal fluctuation， common channel interferences， blind areas and barriers， the possibility of successful detection of the synchronization information within the predefined number of times would be rather low. As such， the synchronization between the devices would be failed.
Fig. 1 is a graph illustrating a multi-frame structure for detecting synchronization information in accordance with an example implementation of the subject matter described herein. It is to be understood that any specific number shown in Fig. 1 as well as other figures are only for illustration， without suggesting any limitations as to the scope of the subject matter described herein.
In the example of Fig. 1， the predefined number of times for detecting the synchronization information is five (5) . That is， a device is allowed to detect the synchronization information at most 5 times. If the device fails to detect the synchronization information for 5 times， the synchronization is failed. By way of example， five frames 101 to 105 are shown， each of which includes 10 slots. The first slot of each frame such as 110， 111， 112， 113 and 114 carry FCCH， and the second slot of a frame such as 120， 121， 122， 123 and 124 carry SCH， for example.
If the device cannot successfully detect information carried by FCCH (referred to as “FCCH information” hereafter) at slot 110， it may continue the detection at slot 111， and then slot 112， slot 113 and slot 114. In case that the signal quality is poor， the device  cannot detect the FCCH information at any of the five slots 110 to 114. As a result， the synchronization fails. In another situation， if the device successfully detects the FCCH information at slot 110 but cannot obtain SCH information at any of slots 120 to 124， the synchronization fails. At this point， radio functions such as radio connection and call generation would not work well， and audio loss or distortion would occur.
In order to at least partially solve the above and other potential problems， a new method and device for adaptive frequency calibration are provided herein. According to implementations of the subject matter described herein， a device， during synchronization with a further device， determines a quality of a signal received from the further device， and adjusts the number of times for detecting synchronization information from the signal based on the quality of the signal. As such， an adaptive number of times associated with the signal quality can be applied to the detection of the synchronization information.
Through the process， the device may perform the synchronization in consideration of the signal quality. In this way， the possibility of successful synchronization between the two devices can be improved. As a result， high-qualified radio synchronization and connection can be guaranteed， even when the device is under poor radio coverage.
Some example implementations of the subject matter described herein will be described with reference to a device (referred to as “a first device” hereafter) to synchronize with a further device (referred to as “a second device” hereafter) .
In accordance with implementations of the subject matter described herein， the devices may be implemented in a variety of ways. In some implementations， either the first device or the second device may be a network device or a terminal device.
As used herein， a network device refers to a device in a communication network， from which a terminal device may receive services. The network device may be a base station (BS) ， an access point (AP) ， a server or any other suitable device in the communication network. The BS may be， for example， a node B (NodeB or NB) ， an evolved NodeB (eNodeB or eNB) ， 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.
A terminal device refers to any end device that can communicate with the  network device and receive services from communication a network. By way of example and not limitation， the terminal device refers to a mobile terminal， user equipment (UE) ， or other suitable device. The UE may be， for example， a Subscriber Station (SS) ， a Portable Subscriber Station， a Mobile Station (MS) ， or an Access Terminal (AT) . The terminal device may include， but not limited to， a mobile phone， a cellular phone， a smart phone， a laptop computer， a tablet， a personal digital assistant (PDA) ， a vehicle， and the like.
The first and second devices may operate in a communication network. 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) ， and so on. Furthermore， the communications between devices 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.
The functionalities and operations of the first device will be described with reference to Fig. 2， which is a flowchart illustrating a method 200 for performing adaptive synchronization in accordance with an example implementation of the subject matter described herein. In other word， the method 200 is implemented at the first device， for example a terminal device， a network device， or other suitable device.
As shown， at 210， the first device receives a signal from a further device (for example， the second device) for synchronization between the first device and the second device. The signal may include synchronization information carried on broadcast channels， such as FCCH， SCH， BCCH and the like.
At 220， the first device determines a quality of the received signal. The quality of the signal may be affected by various kinds of interference or noise. For example， when first device is in proximity to a tower or obstructions such as buildings or trees， the signal quality will drop.
The first device may determine the signal quality based on a variety of factors associated with the signal. Examples of these factors include， but are not limited to， a signal strength， a power level， a ratio of the power level to the signal strength， a Signal to Noise Ratio (SNR) ， a Signal to Interference plus Noise Ratio (SINR) ， a Signal to Interference Ratio (SIR) ， a Carrier to Noise Ratio (CNR) ， a Carrier to Interference plus Noise Ratio (CINR) ， a Channel Quality Indicator (CQI) ， a carrier frequency， a time duration for synchronization between devices， and so on.
By way of example， in some implementations， the first device may determine the signal quality based on the signal strength. The signal strength may be indicated by， for instance， Received Signal Strength Indication (RSSI) . If the RSSI value is high， the first device may determine that the signal quality is good. Otherwise， the first device may determine that the signal quality is poor.
Alternatively， or in addition， in some implementations， the first device may determine the signal quality based on the power level of the signal. The power level may be indicated by， for example， Reference Signal Receiving Power (RSRP) . If the RSRP value is high， the first device may determine that the signal quality is good. Otherwise， the first device may determine that the signal quality is poor.
As another example， in some implementations， the first device may determine the signal quality based on the ratio of the power level to the signal strength. The ratio may be indicated by， for example， Reference Signal Receiving Quality (RSRQ) ， which may be calculated based on RSRP and RSSI. If the RSRQ value is high， the first device may determine that the signal quality is good. Otherwise， the first device may determine that the signal quality is poor.
In some implementations， the CQI may be sent to provide channel quality information including， for example， but not limited in， RSSI， bit error rate (BER) ， and so on， to represent a measure of channel quality for transmitting the signal. In the implementations， the first device may determine the quality of the channel based on the CQI.
In some implementations， the carrier frequency may indicate a frequency band of the carrier for carrying the signal. If the first device determines that the carrier frequency belongs to a predefined range， for example， an edge of the allocated frequency  band， it may determine that the signal may have poor quality since interference at the edge of the allocated frequency band is usually large.
It is also possible for the first device to determine the signal quality based on the time duration for synchronization between the first device and the second device. This time duration may indicate a time interval from broadcast channels (for example， FCCH) searching to registration on the second device. In some implementations， if it is detected that the time duration is too long (that is， length of the time duration exceeds a predefined threshold) ， the first device may determine that the signal quality is not so good.
In some implementations， the first device may determine the signal quality based on SNR， SINR， SIR， CINR， and CNR， alone or in combination. Actually， according to implementations of the subject matter described herein， the first device may determine one of the above factors or any combination thereof as the signal quality. It is to be understood that the above examples factors are only described for purpose of discussion， rather than limitation. Those skilled in the art would appreciate that the first device can determine the signal quality in other suitable ways.
Still in reference to Fig. 2， at 230， the first device adjusts the number of times for detecting synchronization information from the signal based on the signal quality. To this end， in some implementations， the device compares the signal quality with a threshold quality. The threshold quality may be predefined in several ways， for example， according to testing results， system requirements， manufacture settings， and the like. If the signal quality is poor， for example， below the threshold quality， the first device may increase the number of times for detecting the synchronization information. As such， the possibility for successfully performing the synchronization can be improved.
In some implementations， the number of times may be increased by a fixed， predetermined value. For example， the first device may detect the information one more time. Alternatively， in another example， the number of times may be dynamically increased according to one or more relevant factors， such as the quality of the signal， a historical number of times， a system requirement， and the like， alone or in combination.
In some implementations， a plurality of candidate numbers of times may be predetermined associated with different signal quality levels， and the first device may increase the number of times as a number of times selected from the candidate numbers of  times. In an implementation， the candidate number of times may be determined based on testing data obtained in design or manufacturing of the first device. For example， in a testing process made by a device manufacturer， different signal quality levels may be simulated and applied to the first device. Thus， the corresponding candidate numbers of times that can maintain the possibility of successful detection of the synchronization information to a certain extent may be predetermined.
Alternatively， in another implementation， the candidate numbers of times may be determined by the first device itself， for example， when the first device is idle， or in an initialization phase predefined for obtaining the candidate numbers of times.
It is to be understood that the above examples are discussed only for illustration， without suggesting any limitations as to the scope of the subject matter described herein. Any other suitable manners for determining the candidate numbers of times and corresponding signal quality levels are possible as well.
In yet other implementations， the first device may increase the number of times based on one or more historical numbers of times. As used herein， the phrase “historical number of times” refers to the number of times that used by the first device in synchronization information detection in the past. It will be appreciated that the historical number of times is usually associated with a signal quality that is determined at the time when the number of times was used.
In an implementation， a historical number of times and a corresponding signal quality may be recorded in association. Thus， the first device may select， as the adjusted number of times， one of the historical numbers of times whose associated signal quality matches the current signal quality. In some other implementations， there may be several historical numbers of times associated with signal qualities that are closest to the current signal quality. In this case， the first device may calculate an average of these historical numbers of times as the adjusted number of times.
It is to be understood that the above examples are discussed for illustration， rather than limitation. Those skilled in the art would appreciate that there are other suitable ways for determining the number of times to be increased. For example， the first device may determine the number of times based on the system requirements， specification regulations and/or the like.
On the other hand， in some implementations， if the signal quality is good enough， for example， exceeding the threshold quality， the first device will maintain the number of times for detecting the synchronization information. As such， power of the first device can be saved.
Alternatively， in some implementations， if the signal quality is good enough， for example， exceeding the threshold quality， the first device may reduce the number of times for detecting the synchronization information to further save energy. In doing so， the factors such as the quality of the signal， the historical number (s) of times， a system requirement， and the like can be taken into consideration， alone or in combination. As such， an adaptive mechanism for adjusting the number of times for detecting the synchronization information can be achieved. As a result， the synchronization can be performed in a more efficient way.
Through the process， the number of times for detecting the synchronization information can be adjusted in consideration of the signal quality. Still referring the example of Fig. 1， ifthe first device cannot detect the FCCH information at any of the five slots 110 to 114 due to the poor quality of the received signal， then the number of times for detecting the FCCH information may be increased to a new value， for example， 8. As such， the first device would have more chances to obtain the FCCH information. In this way， the possibility of successful synchronization between the first and second devices can be improved. As a result， high-qualified radio synchronization and connection can be guaranteed， even when the device is under poor radio coverage.
In addition to the number of times for information detection， in some implementations， the first device may optionally adjust a configuration of its own receiver based on the signal quality. The configuration of the receiver may be related to， for example， a gain such as an amplification factor of an amplifier of the receiver for amplifying the signal， a reference voltage such as a voltage level acting as a reference of the amplifier， and the like. If the signal quality is poor， the first device may increase the gain of the receiver， increase the reference voltage， or adjust other suitable parameters of the configuration of the receiver. In this way， the synchronization between the first and second devices can be performed in a more adaptive way.
Alternatively， or in addition， in some implementations， if the signal quality is  good enough， the first device may take measures to save power. In such a case， the first device may determine to reduce the gain， the reference voltage， and/or other suitable parameters of configuration of its receiver. In this way， the synchronization can be performed in a more adaptive way and the power of the first device can be saved.
It is to be understood that this is just an example for discussion and is optional， and those skilled in the art would implement in many other ways. For example， if the result of the current calibration is good enough， the first device may not adjust the occurrence of the next calibration.
Now some example implementations of the method 300 will be described with reference to Fig. 3. Fig. 3 is a flowchart 300 illustrating another method for performing adaptive synchronization in accordance with another example implementation of the subject matter described herein. It is to be understood that the method 300， which may be performed by the first device， for example， a terminal device or a network device， can be considered as an example implementation of the method 200.
At 310， the first device receives a signal from a further device， namely， the second device. The signal may be received at a signal burst and may include synchronization information such as FCCH information， SCH information， BCCH information， and so on.
At 320， the first device determines quality of the received signal. The quality of the signal may be determined in a variety of ways， as discussed at 220.
At 330， the first device compares the quality with a threshold quality， and determines whether the quality is less than the threshold quality. If so， the first device may know the quality of the signal is not so good and the number of times for detecting the synchronization can be increased at 340. At 340， the first device increases the number of times for detecting the synchronization information. Then， optionally， the first device may adjust a configuration of its receiver based on the quality of the signal， for example， increasing the gain and/or the reference voltage of the receiver at 350.
On the other hand， if the quality exceeds the threshold quality， the first device may determine that the signal quality is good enough and the number of times for detecting the synchronization information can be reduced at 360. Then， optionally， the first device may reduce the gain and/or the reference voltage of the receiver at 370.
It is to be understood this example is discussed for illustration， rather than limitation. There may be several other implementations within the scope of the subject matter described herein. For example， if the first device determines that the signal quality is good enough， it may determine that there is no need to adjust the number of times， or the gain/reference voltage of the receiver. As such， the power of the first device can be reduced.
In this way， the first device may adaptively perform the synchronization based on the signal quality of the current communication environment. As such， the possibility of successful synchronization can be improved. Furthermore， by reducing the number of times for detecting the synchronization information， the gain of the receiver， and/or the reference voltage of the receiver， power consumption of the first device can be controlled efficiently.
Fig. 4 is a block diagram of a device 400 suitable for implementing one or more implementations of the subject matter described herein. For example， the device 400 may function as the first device as discussed above with reference to Figs. 2-3. Description of the device 400 is not intended to suggest any limitation as to scope of use or functionality of the subject matter described herein， as various implementations may be implemented in diverse general-purpose or special-purpose environments.
As shown， the device 400 includes a controller 420 and a memory 430. The controller 420 may be a real or a virtual processor that is capable of executing a program or computer-executable instructions 440 stored in the memory 430. The memory 430 may be volatile memory (e.g.， registers， cache， RAM) ， non-volatile memory (e.g.， ROM， EEPROM， flash memory) ， or some combination thereof.
In the example shown in Fig. 4， the device 400 further includes a transmitter 405 and a receiver 410. The transmitter 405 and the receiver 410 may be configured by the controller 420 to perform communications with other one or more devices， for example， via an antenna (s) or an antenna array (s) 450. In some implementations， the controller 420 may be configured by the program 440 stored in the memory 430 to work with the receiver 410 to carry out the methods 200 and/or 300 as described above.
Additionally， functionality of the components of the device 400 may be implemented in a single computing machine， for example， a single mobile phone， or in  multiple computing machines that are able to communicate over communication connections， for example， a cloud system.
For the purpose of illustrating spirit and principle of the subject matter described herein， some specific implementations thereof have been described above. Through the process， the device may perform the synchronization in consideration of the signal quality. As a result， high-qualified radio synchronization and connection can be guaranteed， even when the device is under poor radio coverage.
Now only for the purpose of illustration， some example implemented will be listed below.
The subject matter described herein may be embodied as a method implemented at a device， for example， the device 400. The method comprises receiving a signal from a further device for synchronization between the device and the further device； determining a quality of the signal； and adjusting， based on the quality， the number of times for detecting synchronization information from the signal
In some implementations， the determining a quality of the signal comprises： determining the quality of the signal based on at least one of the following associated with the signal： a signal strength， a power level， a ratio of the power level to the signal strength， a SNR， a SINR， a SIR， a CNR， a CINR， a CQI， a carrier frequency， and a time duration for synchronization between the device and the further device.
In some implementations， the adjusting the number of times for detecting synchronization information from the signal comprises： in response to the quality being less than a threshold quality， increasing the number of times for detecting the synchronization information.
In some implementations， the increasing the number of times for detecting synchronization information comprises increasing the number of times based on at least one of： the quality of the signal； a historical number of times； and a system requirement.
In some implementations， the adjusting the number of times for detecting synchronization information from the signal comprises： in response to the quality exceeding a threshold quality， reducing the number of times for detecting the synchronization information.
In some implementations， the reducing the number of times for detecting synchronization information comprises reducing the number of times based on at least one of：the quality of the signal； a historical number of times； and a system requirement.
In some implementations， the method may further comprise adjusting， based on the quality of the signal， a configuration of a receiver of the device.
In some implementations， the adjusting a configuration of a receiver of the device comprises at least one of： in response to the quality being less than the threshold quality， increasing a gain or a reference voltage of a receiver of the device； and in response to the quality exceeding the threshold quality， reducing the gain or the reference voltage of the receiver.
The subject matter described herein can be also embodied as a device. The device comprises： a controller； and a memory coupled to the controller and storing instructions for execution by the controller， the instructions， when executed by the controller， causing the device to perform acts including： receiving a signal from a further device for synchronization between the device and the further device； determining a quality of the signal； and adjusting， based on the quality， the number of times for detecting synchronization information from the signal.
In some implementations， the controller is further configured to， determine the quality of the signal based on at least one of the following associated with the signal： a signal strength， a power level， a ratio of the power level to the signal strength， a SNR， a SINR， a SIR， a CNR， a CINR， a CQI， a carrier frequency， and a time duration for synchronization between the device and the further device.
In some implementations， the controller is further configured to increase， in response to the quality being less than a threshold quality， the number of times for detecting the synchronization information.
In some implementations， the controller is further configured to increase the number of times based on at least one of： the quality of the signal； a historical number of times； and a system requirement.
In some implementations， the controller is further configured to reduce， in response to the quality exceeding a threshold quality， the number of times for detecting the  synchronization information.
In some implementations， the controller is further configured to reduce the number of times based on at least one of： the quality of the signal； a historical number of times； and a system requirement.
In some implementations， the controller is further configured to adjust， based on the quality of the signal， a configuration of a receiver of the device.
In some implementations， the controller is further configured to， in response to the quality being less than the threshold quality， increase a gain or a reference voltage of a receiver of the device； and/or in response to the quality exceeding the threshold quality， reduce the gain or the reference voltage of the receiver.
In some implementations， the controller is further configured to determine an updated error between the first frequency generator and the second frequency generator after the calibration； determine whether the updated error exceeds an error threshold； and in response to determining that the updated error exceeds the error threshold， reduce a time interval between the first time point and a second time point when a next calibration begins.
In some implementations， the controller is further configured to， in response to determining that the updated error being less than the error threshold， increase the time interval between the first time point and the second time point.
The subject matter described herein may be embodied as a computer program product being tangibly stored on a non-transient machine-readable medium and comprising machine-executable instructions. The instructions， when executed by a device， cause the device to： receive a signal from a further device for synchronization between the device and the further device； determine a quality of the signal； and adjust， based on the quality， the number of times for detecting synchronization information from the signal
In some implementations， the instructions， when executed by the device， further cause the device to： determine the quality of the signal based on at least one of the following associated with the signal： a signal strength， a power level， a ratio of the power level to the signal strength， a SNR， a SINR， a SIR， a CNR， a CINR， a CQI， a carrier  frequency， and a time duration for synchronization between the device and the further device.
In some implementations， the instructions， when executed by the device， further cause the device to： in response to the quality being less than a threshold quality， increase the number of times for detecting the synchronization information.
In some implementations， the instructions， when executed by the device， further cause the device to： increase the number of times based on at least one of： the quality of the signal； a historical number of times； and a system requirement.
In some implementations， the instructions， when executed by the device， further cause the device to： in response to the quality exceeding a threshold quality， reduce the number of times for detecting the synchronization information.
In some implementations， the instructions， when executed by the device， further cause the device to： reduce the number of times based on at least one of： the quality of the signal； a historical number of times； and a system requirement.
In some implementations， the instructions， when executed by the device， further cause the device to： adjust， based on the quality of the signal， a configuration of a receiver of the device.
In some implementations， the instructions， when executed by the device， further cause the device to： in response to the quality being less than the threshold quality， increase a gain or a reference voltage of a receiver of the device； and/or in response to the quality exceeding the threshold quality， reduce the gain or the reference voltage of the receiver.
Implementations of the subject matter described herein may further include one or more computer program products being tangibly stored on a non-transient machine-readable medium and comprising machine-executable instructions. The instructions， when executed on a device， causing the device to carry out one or more processes as described above.
Example implementations 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 the example implementations of the subject matter described herein are illustrated and described as block diagrams， flowcharts， or using some other pictorial representation， it will be appreciated that the blocks， apparatus， systems， techniques or methods 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.
In the context of the subject matter described herein， a machine readable medium may be any tangible medium that can contain， or store a program for use by or in connection with an instruction execution system， apparatus， or device. The machine readable medium may be a machine readable signal medium or a machine readable storage medium. A machine 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 machine 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.
Computer program code for carrying out methods of the subject matter described herein may be written in any combination of one or more programming languages. These computer program codes may be provided to a processor of a general purpose computer， special purpose computer， or other programmable data processing apparatus， such that the program codes， when executed by the processor of the computer or other programmable data processing apparatus， cause the functions or operations specified in the flowcharts and/or block diagrams to be implemented. The program code may execute entirely on a computer， partly on the computer， as a stand-alone software package， partly on the computer and partly on a remote computer or entirely on the remote computer or server.
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 any disclosure or of what may be claimed， but rather as descriptions of features that may be specific to particular implementations of particular disclosures. Certain features that are described in this specification in the context of separate implementations can also be implemented in combination in a single implementation. Conversely， various features that are described in the context of a single implementation can also be implemented in multiple implementations separately or in any suitable sub-combination.
Various modifications， adaptations to the foregoing example implementations of this disclosure may become apparent to those skilled in the relevant arts in view of the foregoing description， when read in conjunction with the accompanying drawings. Any and all modifications will still fall within the scope of the non-limiting and example implementations of this disclosure. Furthermore， other implementations of the disclosures set forth herein will come to mind to one skilled in the art to which these implementations of the disclosure pertain having the benefit of the teachings presented in the foregoing descriptions and the drawings.
Therefore， it will be appreciated that the implementations of the disclosure are not to be limited to the specific implementations disclosed and that modifications and other implementations are intended to be included within the scope of the appended claims. Although specific terms are used herein， they are used in a generic and descriptive sense only and not for purposes of limitation.

Claims (20)

  1. A device comprising：
    a controller； and
    a memory coupled to the controller and storing instructions for execution by the controller， the instructions， when executed by the controller， causing the device to perform acts including：
    receiving a signal from a further device for synchronization between the device and the further device；
    determining a quality of the signal； and
    adjusting， based on the quality， the number of times for detecting synchronization information from the signal.
  2. The device of claim 1， wherein the determining a quality of the signal comprises：
    determining the quality of the signal based on at least one of the following associated with the signal：
    a signal strength，
    a power level，
    a ratio of the power level to the signal strength，
    a Signal to Noise Ratio (SNR) ，
    a Signal to Interference plus Noise Ratio (SINR) ，
    a Carrier to Interference plus Noise Ratio (CINR) ，
    a Channel Quality Indicator (CQI) ，
    a carrier frequency， and
    a time duration for synchronization between the device and the further device.
  3. The device of claim 1， wherein the adjusting the number of times for detecting synchronization information from the signal comprises：
    in response to the quality being less than a threshold quality， increasing the number of times for detecting the synchronization information.
  4. The device of claim 3， wherein the increasing the number of times for detecting synchronization information comprises increasing the number of times based on at least one of：
    the quality of the signal；
    a historical number of times； and
    a system requirement.
  5. The device of claim 1， wherein the adjusting the number of times for detecting synchronization information from the signal comprises：
    in response to the quality exceeding a threshold quality， reducing the number of times for detecting the synchronization information.
  6. The device of claim 5， wherein the reducing the number of times for detecting synchronization information comprises reducing the number of times based on at least one of：
    the quality of the signal；
    a historical number of times； and
    a system requirement.
  7. The device of claim 1， further comprising：
    adjusting， based on the quality of the signal， a configuration of a receiver of the device.
  8. The device of claim 7， wherein the adjusting a configuration of a receiver of the device comprises at least one of：
    in response to the quality being less than the threshold quality， increasing a gain or a reference voltage of a receiver of the device； and
    in response to the quality exceeding the threshold quality， reducing the gain or the reference voltage of the receiver.
  9. A method comprising：
    receiving a signal from a further device for synchronization between the device and the further device；
    determining a quality of the signal； and
    adjusting， based on the quality， the number of times for detecting synchronization information from the signal.
  10. The method of claim 9， wherein the determining a quality of the signal comprises：
    determining the quality of the signal based on at least one of the following associated with the signal：
    a signal strength，
    a power level，
    a ratio of the power level to the signal strength，
    a Signal to Noise Ratio (SNR) ，
    a Signal to Interference plus Noise Ratio (SINR) ，
    a Carrier to Interference plus Noise Ratio (CINR) ，
    a Channel Quality Indicator (CQI) ，
    a carrier frequency， and
    a time duration for synchronization between the device and the further device.
  11. The method of claim 9， wherein the adjusting the number of times for detecting synchronization information from the signal comprises：
    in response to the quality being less than a threshold quality， increasing the number of times for detecting the synchronization information.
  12. The method of claim 11， wherein the increasing the number of times for detecting synchronization information comprises increasing the number of times based on at least one of：
    the quality of the signal；
    a historical number of times； and
    a system requirement.
  13. The method of claim 9， wherein the adjusting the number of times for detecting synchronization information from the signal comprises：
    in response to the quality exceeding a threshold quality， reducing the number of times for detecting the synchronization information.
  14. The method of claim 13， wherein the reducing the number of times for detecting synchronization information comprises reducing the number of times based on at least one of：
    the quality of the signal；
    a historical number of times； and
    a system requirement.
  15. The method of claim 9， further comprising：
    adjusting， based on the quality of the signal， a configuration of a receiver of the device.
  16. The method of claim 15， wherein the adjusting a configuration of a receiver of the device comprises at least one of：
    in response to the quality being less than the threshold quality， increasing a gain or a reference voltage of a receiver of the device； and
    in response to the quality exceeding the threshold quality， reducing the gain or the reference voltage of the receiver.
  17. A computer program product being tangibly stored on a non-transient machine-readable medium and comprising machine-executable instructions， the instructions， when executed by a device， causing the device to perform acts including：
    receiving a signal from a further device for synchronization between the device and the further device；
    determining a quality of the signal； and
    adjusting， based on the quality， the number of times for detecting synchronization information from the signal.
  18. The computer program product of claim 15， wherein the instructions， when executed by the device， further cause the device to perform acts including：
    in response to the quality being less than a threshold quality， increasing the number of times for detecting the synchronization information.
  19. The computer program product of claim 15， wherein the instructions， when executed by the device， further cause the device to perform acts including：
    in response to the quality exceeding a threshold quality， reducing the number of times for detecting the synchronization information.
  20. The computer program product of claim 15， wherein the instructions， when executed by the device， further cause the device to perform acts including：
    adjusting， based on the quality of the signal， a configuration of a receiver of the device.
PCT/CN2016/106622 2016-11-21 2016-11-21 Adaptive synchronization WO2018090376A1 (en)

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US20140213267A1 (en) * 2011-09-30 2014-07-31 Huawei Technologies Co., Ltd. Radio connection re-establishment method, user equipment and base station
US20150097656A1 (en) * 2013-10-07 2015-04-09 Kabushiki Kaisha Tokai Rika Denki Seisakusho Radio wave receiver
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US20140213267A1 (en) * 2011-09-30 2014-07-31 Huawei Technologies Co., Ltd. Radio connection re-establishment method, user equipment and base station
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