CN116546615B - Resynchronization method and device for long term evolution terminal in connection state - Google Patents
Resynchronization method and device for long term evolution terminal in connection state Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/003—Arrangements to increase tolerance to errors in transmission or reception timing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/02—Power saving arrangements
- H04W52/0209—Power saving arrangements in terminal devices
- H04W52/0212—Power saving arrangements in terminal devices managed by the network, e.g. network or access point is master and terminal is slave
- H04W52/0216—Power saving arrangements in terminal devices managed by the network, e.g. network or access point is master and terminal is slave using a pre-established activity schedule, e.g. traffic indication frame
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/02—Power saving arrangements
- H04W52/0209—Power saving arrangements in terminal devices
- H04W52/0251—Power saving arrangements in terminal devices using monitoring of local events, e.g. events related to user activity
- H04W52/0258—Power saving arrangements in terminal devices using monitoring of local events, e.g. events related to user activity controlling an operation mode according to history or models of usage information, e.g. activity schedule or time of day
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- 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
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- 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
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Abstract
The disclosure relates to a resynchronization method and device for a long term evolution terminal in a connected state. Wherein the method comprises the following steps: when the long-term evolution terminal wakes up from deep sleep in a connection state, the pre-arrangement module generates preset configuration, and based on the time offset estimated value and the preset configuration, the re-synchronization module generates a first estimated value of the time offset/frequency offset parameter by adjusting the received first preset subframe. And outputting a time-offset/frequency-offset fine adjustment value by the time-offset/frequency-offset parameter estimation module through adjustment of the first estimation value of the time-offset/frequency-offset parameter. After the time offset/frequency offset fine adjustment value is adjusted, when physical downlink control information is detected, downlink and uplink services are scheduled, and resynchronization under the connection state EDRX is completed. The method reliably ensures the service receiving performance after the ultra-long deep sleep awakening under the extended discontinuous reception through the improvement of software and hardware, is controllable and orderly, is simple to realize, has low device power consumption and effectively improves the user experience.
Description
Technical Field
The disclosure relates to the field of synchronization methods of terminals, and in particular relates to a resynchronization method and device for a long-term evolution terminal in a connected state.
Background
After the terminal wakes up in a long-time sleep state in a connection state, the terminal starts to receive downlink data at a radio frequency at the beginning of a duration starting frame and demodulates the data; the terminal wakes up after deep sleep, and larger time offset and frequency offset can be caused due to error accumulation of fast and slow clock switching, and in addition, the automatic gain control of the signal is not tracked for a long time, so that the problem of automatic gain control is also caused after the terminal moves; before the demodulation data is received, if the parameters such as time offset/frequency offset/automatic gain control and the like are not estimated correctly and adjusted or compensated, the receiving and demodulation of the downlink demodulation data are directly affected. But when the deep sleep time is long (EDRX CONN), the slow clock error is typically estimated at 5ppm, the time offset has exceeded 1 CP. Conventional terminals are typically supported in the connected state for conventional extension methods supporting the EDRX (ehanced dscontinuous rception, extended discontinuous reception) configuration in two ways:
firstly, expanding the method, halving the deep sleep time to a supportable interval, then waking up a downlink subframe containing more than 1 CRS (Cell-specific Reference Signals, cell specific reference signal) according to the interval terminal to estimate parameters such as time offset, frequency offset, AGC and the like, and continuing to sleep deeply after parameter adjustment; the last time the terminal wakes up is to estimate the parameters first, and then to start the reception and demodulation of the downlink demodulation data in the initial frame of the Oncuration.
In the second method, because the time bias and frequency bias accumulated by long-time deep sleep are too large and the initial network searching of the terminal is almost similar, the cell synchronization is carried out in a cell initial network searching mode, a cell initial network searching process is inserted before an Onduration initial frame, hardware parameter configuration is basically multiplexed, and the hardware parameter configuration is mainly the expansion of software scheduling.
But from a power saving point of view, both methods are not ideal in practice. Taking 10.24 seconds of EDRX cycle as an example, taking a method-in which 7 additional insertions are needed in the middle, and waking up from deep sleep for parameter estimation at intervals of 1.28 seconds; with the second method, although no additional intermediate wake-up operation is needed, because the amount of data reception and processing is large, a large advance is needed to wake up the RF to receive data and post-processing before the Onduration start frame.
Accordingly, there is a need for one or more approaches to address the above-described problems.
It should be noted that the information disclosed in the above background section is only for enhancing understanding of the background of the present disclosure and thus may include information that does not constitute prior art known to those of ordinary skill in the art.
Disclosure of Invention
An object of the present disclosure is to provide a resynchronization method and apparatus for a long term evolution terminal in a connected state, which further overcome at least some of one or more of the problems due to the limitations and disadvantages of the related art.
According to one aspect of the present disclosure, there is provided a resynchronization method of a long term evolution terminal in a connected state, including:
when a long-term evolution terminal wakes up from deep sleep, a pre-arranging module presets the initial position of the long-term evolution terminal for receiving data and the length configuration thereof based on the time bias estimated value of a service cell in the sleep period, generates preset configuration, and a re-synchronizing module receives a first preset subframe which is sent by the service cell and contains the re-synchronizing data of a main synchronizing signal/auxiliary synchronizing signal of the service cell based on the time bias estimated value and the preset configuration, and generates a first estimated value of time bias/frequency bias parameters by means of combination logic adjustment of input configuration parameters of a synchronization accelerator and using small-scale FFT/IFFT;
when the time-offset/frequency-offset parameter estimation module receives a second preset subframe preset by the pre-arrangement module, the first estimation value of the time-offset/frequency-offset parameter is adjusted through the service data processing module to generate a second estimation value of the time-offset/frequency-offset parameter and a residual value, the residual value is used as a priori parameter of the second estimation value of the time-offset/frequency-offset parameter to compensate the second preset subframe to generate compensation data, the time-offset/frequency-offset parameter estimation module carries out fine estimation on the time-offset/frequency-offset parameter of the compensation data, and the time-offset/frequency-offset fine adjustment value is output;
and the service data processing module is used for adjusting the time offset/frequency offset fine adjustment value to generate a data receiving signal, the scheduling configuration control module is used for monitoring downlink control information by receiving physical downlink control channel data based on the data receiving signal, and when the physical downlink control information is detected, the data transmitting/receiving execution module is used for scheduling downlink and uplink services to complete resynchronization under the connection state EDRX.
In an exemplary embodiment of the present disclosure, the method for resynchronizing a long term evolution terminal in a connected state further includes:
based on the period configuration of the extended discontinuous reception, the data subframes, the starting positions of the received data and the length of the received data received in the resynchronization process are pre-arranged through the pre-arranging module, and a pre-arranging model is generated;
the pre-arranging model comprises a data receiving length containing a main synchronous signal/auxiliary synchronous signal, a time advance containing a data starting position of the main synchronous signal/auxiliary synchronous signal relative to an Onduce starting subframe head, a subframe number of time offset/frequency offset parameter estimation receiving data, and a time advance containing time offset/frequency offset parameter estimation receiving data relative to the Onduce starting subframe head.
In an exemplary embodiment of the present disclosure, the method for resynchronizing a long term evolution terminal in a connected state further includes:
when the preset configuration of the serving cell is time division multiplexing in a non-multicast broadcast single frequency network, the preset first subframe received by the resynchronization module is set to be a zeroth subframe and a first subframe or a fifth subframe and a sixth subframe in cyclic subframes, and the preset second subframe received by the time bias/frequency bias parameter estimation module is adjusted based on the preset configuration;
when the preset configuration of the service cell is time division multiplexing in a multicast and broadcast single frequency network, the preset first subframe received by the resynchronization module is set as a zeroth subframe and a first subframe or a fifth subframe and a sixth subframe in the cyclic subframes, and the preset second subframe received by the time bias/frequency bias parameter estimation module is set as a zeroth subframe and a first subframe or a fifth subframe and a sixth subframe in the cyclic subframes;
when the preset configuration of the service cell is that the frequency division multiplexing is performed on a non-multicast broadcast single frequency network, the preset first subframe received by the resynchronization module is set as a zeroth subframe and a fifth subframe in the cyclic subframes, and the preset second subframe received by the time offset/frequency offset parameter estimation module is set as any subframe;
when the preset configuration of the serving cell is that the frequency division multiplexing is in the multicast and broadcast single-frequency network, the preset first subframe received by the resynchronization module is set as a zeroth subframe and a fifth subframe in the cyclic subframe, and the preset second subframe received by the time offset/frequency offset parameter estimation module is set as a zeroth subframe, a fourth subframe, a fifth subframe and a ninth subframe in the cyclic subframe.
In an exemplary embodiment of the present disclosure, the method for resynchronizing a long term evolution terminal in a connected state further includes:
when the time point interval of the long-term evolution terminal for receiving/transmitting data meets a threshold value, a sleep control module controls the long-term evolution terminal to sleep, the long-term evolution terminal closes the periodic subframe interruption, the fast clock is switched to the slow clock, and the time count of the slow clock is carried out;
and after the sleep control module detects a preset awakening time point, the sleep control module wakes up the module in the long-term evolution terminal, resumes periodic subframe interruption, and starts the receiving and sending processing of the scheduling data.
In one aspect of the present disclosure, a resynchronization apparatus for a long term evolution terminal in a connected state is provided, where the apparatus includes a long term evolution terminal service module, a resynchronization module, and a time offset/frequency offset parameter estimation module:
the long-term evolution terminal service module comprises a scheduling configuration control module, a data transmitting/receiving execution module and a service data processing module, and is used for downlink data receiving scheduling configuration, data receiving processing, uplink data transmitting scheduling configuration and radio frequency/digital front end control;
the resynchronization module is used for processing a preset first subframe containing the resynchronization data of the primary synchronization signal/the secondary synchronization signal of the serving cell and generating a first estimated value of the time offset/frequency offset parameter;
the time offset/frequency offset parameter estimation module is used for carrying out time offset/frequency offset fine estimation on the downlink subframe data of the serving cell containing at least two cell specific reference signals and outputting a time offset/frequency offset fine adjustment value.
In one aspect of the present disclosure, a resynchronization apparatus for a long term evolution terminal in a connected state is provided, wherein the data transmission/reception execution module includes a clock, a radio frequency module, and a digital front end module:
the clock is used for periodically generating subframe interruption to drive the scheduling configuration control module to run according to a time sequence;
the radio frequency module is realized by an integrated circuit, and is used for converting an analog signal received by an antenna into a digital signal and transmitting the digital signal to the digital front-end module, and the radio frequency module is used for converting the digital signal of the digital front-end module into an analog signal and transmitting the analog signal at a transmitting antenna;
the digital front-end module is realized by an integrated circuit and is used for generating a processing signal after sampling rate conversion and filtering processing of the received digital signal, the digital front-end module is used for transmitting the processing signal to a downlink accelerator, the digital front-end module is used for generating a transmitting signal after sampling rate conversion and filtering processing of processing data of an uplink accelerator, and the digital front-end module is used for transmitting the transmitting signal to the radio frequency module.
In one aspect of the present disclosure, a resynchronization apparatus for a long term evolution terminal in a connected state is provided, where the apparatus further includes a pre-ranking module, a sleep control module, and a data receiving configuration module:
the pre-arranging module is a software module and is used for generating a pre-arranging model;
the sleep control module is a software module and is used for controlling sleep threshold judgment, fast and slow clock switching and wake-up triggering of a slow clock preset time point module of the long-term evolution terminal;
the data receiving configuration module is a software module for periodically triggering and scheduling clocks and is used for sending data receiving configuration to the data sending/receiving execution module, and the data receiving configuration module is used for sending post-processing requirement parameter configuration to the resynchronization module, the time offset/frequency offset parameter estimation module and the service data processing module.
A method for resynchronizing a long term evolution terminal in a connected state in an exemplary embodiment of the present disclosure. Wherein the method comprises the following steps: when the long-term evolution terminal wakes up from deep sleep in a connection state, the pre-arrangement module generates preset configuration, and based on the time offset estimated value and the preset configuration, the re-synchronization module generates a first estimated value of the time offset/frequency offset parameter by adjusting the received first preset subframe. And outputting a time-offset/frequency-offset fine adjustment value by the time-offset/frequency-offset parameter estimation module through adjustment of the first estimation value of the time-offset/frequency-offset parameter. After the time offset/frequency offset fine adjustment value is adjusted, when physical downlink control information is detected, downlink and uplink services are scheduled, and resynchronization under the connection state EDRX is completed. The method reliably ensures the service receiving performance after the ultra-long deep sleep awakening under the extended discontinuous reception through the improvement of software and hardware, is controllable and orderly, is simple to realize, has low device power consumption and effectively improves the user experience.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
The above and other features and advantages of the present disclosure will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings.
Fig. 1 is a flowchart illustrating a resynchronization method of a long term evolution terminal in a connected state according to an exemplary embodiment of the present disclosure;
fig. 2 is a diagram illustrating a received data length of a resynchronization method of a long term evolution terminal in a connected state according to an exemplary embodiment of the present disclosure;
fig. 3 is a first class flow chart of a pre-ranking model of a method for resynchronization of a long term evolution terminal in a connected state according to an exemplary embodiment of the present disclosure;
fig. 4 is a flow chart of a second class of pre-ranking model of a method for resynchronization of a long term evolution terminal in a connected state according to an exemplary embodiment of the present disclosure;
fig. 5 is a flowchart of a first type of detection process of a resynchronization method of a long term evolution terminal in a connected state according to an exemplary embodiment of the present disclosure;
fig. 6 is a flowchart illustrating a second type of detection process of a resynchronization method of a long term evolution terminal in a connected state according to an exemplary embodiment of the present disclosure;
fig. 7 is a flowchart illustrating a third type of detection process of a resynchronization method of a long term evolution terminal in a connected state according to an exemplary embodiment of the present disclosure;
fig. 8 is a flowchart illustrating a fourth type of detection process of a resynchronization method of a long term evolution terminal in a connected state according to an exemplary embodiment of the present disclosure;
fig. 9 is a schematic block diagram of a resynchronization apparatus of a long term evolution terminal in a connected state according to an exemplary embodiment of the present disclosure;
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. However, the exemplary embodiments can be embodied in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar parts, and thus a repetitive description thereof will be omitted.
Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the disclosure. One skilled in the relevant art will recognize, however, that the disclosed aspects may be practiced without one or more of the specific details, or with other methods, components, materials, devices, steps, etc. In other instances, well-known structures, methods, devices, implementations, materials, or operations are not shown or described in detail to avoid obscuring aspects of the disclosure.
The block diagrams depicted in the figures are merely functional entities and do not necessarily correspond to physically separate entities. That is, these functional entities may be implemented in software, or in one or more software-hardened modules, or in different networks and/or processor devices and/or microcontroller devices.
In this exemplary embodiment, a resynchronization method of a long term evolution terminal in a connected state is provided first; referring to fig. 1-2, the resynchronization method of the lte terminal in a connected state may include the steps of:
step S110, when a long-term evolution terminal wakes up from deep sleep, a pre-arrangement module presets the initial position of a service cell for receiving data and the length configuration thereof based on the time bias estimated value of the service cell during sleep, generates preset configuration, and a re-synchronization module receives a first preset subframe which is sent by the service cell and contains the service cell primary synchronization signal/secondary synchronization signal (Primary Synchronization Signal, PSS, secondary Synchronization Signal, SSS) re-synchronization data, and generates a first estimation value of the time bias/frequency bias parameter by using small-scale FFT/IFFT (fast Fourier transform)/IFFT (inverse fast Fourier transform) through the combination logic adjustment of the input configuration parameter of a synchronization accelerator;
step S120, when the time-offset/frequency-offset parameter estimation module receives a second preset subframe preset by the preset module, the first estimation value of the time-offset/frequency-offset parameter is adjusted through the service data processing module to generate a second estimation value of the time-offset/frequency-offset parameter and a residual value, the residual value is used as a priori parameter of the second estimation value of the time-offset/frequency-offset parameter to compensate the second preset subframe, compensation data is generated, fine estimation of the time-offset/frequency-offset parameter is performed on the compensation data through the time-offset/frequency-offset parameter estimation module, and a time-offset/frequency-offset fine adjustment value is output;
and step S130, the time offset/frequency offset fine adjustment value is adjusted through the service data processing module, a data receiving signal is generated, the scheduling configuration control module monitors downlink control information through receiving physical downlink control channel data based on the data receiving signal, and when the physical downlink control information is detected, the data sending/receiving execution module schedules downlink and uplink services to complete resynchronization under the connection state EDRX.
The method comprises the steps that when the long-term evolution terminal wakes up from deep sleep in a connected state, a pre-arrangement module generates preset configuration, and based on a time offset estimated value and the preset configuration, the re-synchronization module generates a first estimated value of a time offset/frequency offset parameter by adjusting a received first preset subframe. And outputting a time-offset/frequency-offset fine adjustment value by the time-offset/frequency-offset parameter estimation module through adjustment of the first estimation value of the time-offset/frequency-offset parameter. After the time offset/frequency offset fine adjustment value is adjusted, when physical downlink control information is detected, downlink and uplink services are scheduled, and resynchronization under the connection state EDRX is completed. The method reliably ensures the service receiving performance after the ultra-long deep sleep awakening under the extended discontinuous reception through the improvement of software and hardware, is controllable and orderly, is simple to realize, has low device power consumption and effectively improves the user experience.
Next, a resynchronization method of a long term evolution terminal in a connected state in the present exemplary embodiment will be further described.
In step S110, when the long term evolution terminal wakes up from deep sleep, based on the time offset estimation value of the serving cell during sleep, the synchronization accelerator adds a new resynchronization operation mode, the data post-processing time is not more than 1.1ms in total, and the data receiving time point of the resynchronization procedure of the terminal after each wake up from ultra-long deep sleep is pre-arranged under the cycle configuration of 5.12 seconds and 10.24 seconds of the EDRX. In this way, when deep sleep is performed each time, the pre-arranging module presets the initial position of the long term evolution terminal for receiving data and the length configuration thereof, generates preset configuration, and based on the time offset estimated value and the preset configuration, the re-synchronizing module receives a first preset subframe which is sent by the serving cell and contains the re-synchronizing data of the primary synchronizing signal/the secondary synchronizing signal of the serving cell, and generates a first estimated value of the time offset/frequency offset parameter by using small-scale FFT/IFFT (only small-scale FFT/IFFT processing is used, so that large frequency offset estimation can be performed, and the whole processing time can be estimated and controlled) through the combination logic adjustment of the input configuration parameters of the synchronization accelerator.
In the embodiment of the present example, as shown in fig. 3 to fig. 4, based on the period configuration of the extended discontinuous reception, the pre-arranging module performs pre-arranging on the data subframe, the received data starting position and the received data length received in the re-synchronization process, so as to generate a pre-arranging model. Resynchronization Pattern pre-ordering is performed once when the configuration of the EDRX is issued (or updated).
The pre-arranging model comprises a data receiving length containing a main synchronous signal/auxiliary synchronous signal, a time advance containing a data starting position of the main synchronous signal/auxiliary synchronous signal relative to an Onduce starting subframe head, a subframe number of time offset/frequency offset parameter estimation receiving data, and a time advance containing time offset/frequency offset parameter estimation receiving data relative to the Onduce starting subframe head. And when the extended discontinuous reception configuration is issued, pre-arranging each data receiving time point related to the extended discontinuous reception resynchronization process of the connection mode at one time, and statically planning to avoid repeated calculation.
In step S120, when the time offset/frequency offset parameter estimation module receives the second preset subframe preset by the preset module, the service data processing module adjusts the first estimation value of the time offset/frequency offset parameter to generate a second estimation value of the time offset/frequency offset parameter and a residual value, and in this example, the large time offset and the large frequency offset output by the resynchronization module are adjusted first, so that the time offset/frequency offset parameter estimation on the downlink subframe selected by the time division multiplexing uplink/downlink configuration of the serving cell is performed; and the residual value is used as a priori parameter of a second estimated value of the time-offset/frequency-offset parameter to compensate the second preset subframe, compensation data are generated, the time-offset/frequency-offset parameter estimation module carries out fine estimation on the time-offset/frequency-offset parameter of the compensation data, and a time-offset/frequency-offset fine adjustment value is output. And then, the output time offset/frequency offset fine adjustment value is adjusted before the interruption of the next subframe, and finally, after the downlink service is received, the time offset/frequency offset estimation and adjustment are carried out along with the service processing.
In an embodiment of the present example, as shown in fig. 5, when the preset configuration of the serving cell is time division multiplexing in a non-multicast broadcast single frequency network, the preset first subframe received by the resynchronization module is set to be a zeroth subframe and a first subframe or a fifth subframe and a sixth subframe in a cyclic subframe, and the preset second subframe received by the time offset/frequency offset parameter estimation module is adjusted based on the preset configuration.
That is, 6 symbol long resynchronisation data including PSS/SSS (Primary Synchronization Signal, primary synchronization signal, secondary Synchronization Signal, secondary synchronization signal) signals are received from point a, FFT is started to process after the first symbol is received, and the first estimated value of the time offset/frequency offset parameter (the length of time used is y) is output after the processing is completed before point e. And then, carrying out time offset and frequency offset value adjustment at a point e, and outputting time offset/frequency offset fine adjustment values (the used time is the length of z1 and z 2) at a point f/h, thereby obtaining the following steps:
y+z1<28 symbol（NCP） ，y+z2<30 symbol（NCP）
y+z1<24 symbol（ECP），y+z2<26 symbol（ECP）
in the embodiment of the present example, as shown in fig. 6, when the preset configuration of the serving cell is time division multiplexing in a multicast and broadcast single frequency network, the preset first subframe received by the resynchronization module is set to be a zeroth subframe and a first subframe or a fifth subframe and a sixth subframe in a cyclic subframe, and the preset second subframe received by the time bias/frequency offset parameter estimation module is set to be a zeroth subframe and a first subframe or a fifth subframe and a sixth subframe in a cyclic subframe, which can be derived as follows:
y+z1<42 symbol（NCP） y+z2<44 symbol（NCP）
y+z1<36 symbol（ECP），y+z2<38 symbol（ECP）
in the embodiment of the present example, as shown in fig. 7, when the preset configuration of the serving cell is that the frequency division multiplexing is in a non-multicast broadcast single frequency network, the preset first subframe received by the resynchronization module is set to be a zeroth subframe and a fifth subframe in the cyclic subframes, and the preset second subframe received by the time offset/frequency offset parameter estimation module is set to be an arbitrary subframe, the same can be deduced:
y+z1<22 symbol（NCP），y+z2<24 symbol（NCP）
y+z1<19 symbol（ECP），y+z2<21 symbol（ECP）
in an embodiment of the present example, as shown in fig. 8, when the preset configuration of the serving cell is that the frequency division multiplexing is in the multicast and broadcast single frequency network, the preset first subframe received by the resynchronization module is set as a zeroth subframe and a fifth subframe in the cyclic subframes, and the preset second subframe received by the time offset/frequency offset parameter estimation module is set as a zeroth subframe, a fourth subframe, a fifth subframe and a ninth subframe in the cyclic subframes. The above can be deduced:
y+z1<36 symbol（NCP），y+z2<38 symbol（NCP）
y+z1<31 symbol（ECP），y+z2<33 symbol（ECP）
the PSS/SSS processing sequence of the current typical ICS is: for data of N ms, PSS processing performs Block processing (1 time 2048 point FFT, 39 times 2048 point correlation operations of 3 NID2 respectively) according to 1ms segments, and the data can start processing after 1 st 1ms is received; and the processing time of the SSS is 2.4ms which is required by processing and outputting 24 candidate calculation according to the previous-stage PSS; the overall time y= (n+2.4) ms. The main factors influencing the PSS processing time are the number of gears of frequency estimation and the size of FFT, and the main factors influencing the SSS processing time are the candidate number of the previous PSS output and duplex type, cp type and field indication; so the processing time is reduced by at least a factor of 4-6 when the duplex type, cp type, field indication are all known.
When the same hardware resource is also used for ICS detection in serving cell resynchronization detection, PSS is processed 3 times per 128 points (Block processing is 1 time 128 point FFT, 39 times 128 point correlation operation of NID2 is specified), the PSS processing time of single Block is estimated to be reduced by at least 5 times, so the overall post-processing time is:
y<3(Block)*1ms/5 +2.4 ms /4 = 0.6+0.6 = 1.2ms
assuming z1=6 symbol (NCP), z2=8 symbol (NCP), then the most demanding y+z1<22 symbol (NCP), y+z2<24 symbol (NCP) where y <16 symbol (NCP) = 1.142ms.
Assuming z1=5 symbol (ECP), z2=7 symbol (ECP), then the most demanding y+z1<19 symbol (ECP), y+z2<21 symbol (ECP) where y <14 symbol (ECP) =1.167 ms.
The full capability satisfies the timing constraint that the synchrotron can use hardware resources in a re-synchronization scenario without exceeding the initial cell synchronization. Furthermore, the re-synchronization uses FFT/IFFT at 128 points, and the processing time and hardware resources actually used must be less than those of FFT/IFFT at 2048 points, so that it is necessary to make the operation faster and more power-saving.
In step S130, the service data processing module adjusts the fine adjustment value of time offset/frequency offset to generate a data receiving signal, the scheduling configuration control module monitors downlink control information by receiving physical downlink control channel data based on the data receiving signal, and when physical downlink control information is detected, the data transmitting/receiving execution module schedules downlink and uplink services to complete resynchronization under the connection state EDRX.
In the embodiment of the present example, when the long term evolution terminal receives/transmits data in a time point interval that satisfies a threshold value, the sleep control module controls the long term evolution terminal to sleep, and the long term evolution terminal closes the periodic subframe interruption, switches the fast clock to the slow clock, and counts the time of the slow clock. When no uplink service is performed after the downlink service is processed, the terminal can sleep down as long as the interval between the current time point and the time point when the RF/DFE starts to receive data again meets the limit threshold value, and the terminal firstly closes the periodic subframe interruption, then switches the fast clock into the slow clock and counts the time.
And after the sleep control module detects a preset awakening time point, the sleep control module wakes up the module in the long-term evolution terminal, resumes periodic subframe interruption, and starts the receiving and sending processing of the scheduling data. That is, after the set wake-up time point is reached, the terminal wakes up from sleep, then resumes the system, resumes the periodic subframe interruption, resumes the data reception configuration 1ms in advance (including uplink, of course, and resumes uplink transmission only after general advanced downlink resynchronization). When the sleep decision is made, if the sleep decision is deep sleep, the starting time point of the 'serving cell PSS/SSS resynchronization' in the pre-scheduling pattern is the time point when the terminal expects to start downlink reception.
It should be noted that although the steps of the methods of the present disclosure are illustrated in the accompanying drawings in a particular order, this does not require or imply that the steps must be performed in that particular order or that all of the illustrated steps be performed in order to achieve desirable results. Additionally or alternatively, certain steps may be omitted, multiple steps combined into one step to perform, and/or one step decomposed into multiple steps to perform, etc.
In addition, in the present exemplary embodiment, a resynchronization apparatus for a long term evolution terminal in a connected state is also provided. Referring to fig. 9, the resynchronization apparatus 400 of a long term evolution terminal in a connected state may include: a long term evolution terminal service module 410, a resynchronization module 420, a time/frequency offset parameter estimation module 430:
the long term evolution terminal service module 410 includes a scheduling configuration control module 412, a data transmission/reception execution module 411, and a service data processing module 413, where the long term evolution terminal service module 410 is configured to perform downlink data reception scheduling configuration, data reception processing, uplink data transmission scheduling configuration, and radio frequency/digital front end control;
the resynchronization module 420 is configured to process a preset first subframe containing the serving cell primary synchronization signal/secondary synchronization signal resynchronization data, and generate a first estimated value of a time offset/frequency offset parameter;
the time offset/frequency offset parameter estimation module 430 is configured to perform fine time offset/frequency offset estimation on the serving cell downlink subframe data containing at least two cell specific reference signals, and output a fine time offset/frequency offset adjustment value.
In the embodiment of the present example, the data transmission/reception execution module 411 includes a clock, a radio frequency module, a digital front end module:
the clock is used for periodically generating subframe interruption to drive the scheduling configuration control module to run according to a time sequence;
the radio frequency module is realized by an integrated circuit, and is used for converting an analog signal received by an antenna into a digital signal and transmitting the digital signal to the digital front-end module, and the radio frequency module is used for converting the digital signal of the digital front-end module into an analog signal and transmitting the analog signal at a transmitting antenna;
the digital front-end module is realized by an integrated circuit and is used for generating a processing signal after sampling rate conversion and filtering processing of the received digital signal, the digital front-end module is used for transmitting the processing signal to a downlink accelerator, the digital front-end module is used for generating a transmitting signal after sampling rate conversion and filtering processing of processing data of an uplink accelerator, and the digital front-end module is used for transmitting the transmitting signal to the radio frequency module.
In the embodiment of this example, as shown in fig. 9, the apparatus further includes a pre-arrangement module 440, a sleep control module 460, and a data reception configuration module 450:
the pre-ranking module 440 is a software module, and the pre-ranking module 440 is configured to generate a pre-ranking model;
the sleep control module 460 is a software module, and is configured to control sleep threshold decision, fast and slow clock switching, and wake-up triggering of a slow clock preset time point module of the long term evolution terminal;
the data receiving configuration module 450 is a software module for periodic clock triggering scheduling, and is configured to send a data receiving configuration to the data sending/receiving executing module, and the data receiving configuration module is configured to send a post-processing requirement parameter configuration to the resynchronization module, the time offset/frequency offset parameter estimation module, and the service data processing module.
The specific details of the resynchronization device module in the connected state of each of the above long term evolution terminals are described in detail in the resynchronization method in the connected state of the corresponding one of the long term evolution terminals, so that the details are not repeated here.
It should be noted that although several modules or units of the resynchronization apparatus 400 of a long term evolution terminal in a connected state are mentioned in the above detailed description, such division is not mandatory. Indeed, the features and functionality of two or more modules or units described above may be embodied in one module or unit in accordance with embodiments of the present disclosure. Conversely, the features and functions of one module or unit described above may be further divided into a plurality of modules or units to be embodied.
Furthermore, the above-described drawings are only schematic illustrations of processes included in the method according to the exemplary embodiment of the present application, and are not intended to be limiting. It will be readily appreciated that the processes shown in the above figures do not indicate or limit the temporal order of these processes. In addition, it is also readily understood that these processes may be performed synchronously or asynchronously, for example, among a plurality of modules.
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any adaptations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
It is to be understood that the present disclosure is not limited to the precise arrangements and instrumentalities shown in the drawings, and that various modifications and changes may be effected without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.
Claims (7)
1. A method for resynchronizing a long term evolution terminal in a connected state, the method comprising:
when a long-term evolution terminal wakes up from deep sleep, a pre-arranging module presets the initial position of the long-term evolution terminal for receiving data and the length configuration thereof based on the time bias estimated value of a service cell in the sleep period, generates preset configuration, and a re-synchronizing module receives a first preset subframe which is sent by the service cell and contains the re-synchronizing data of a main synchronizing signal/auxiliary synchronizing signal of the service cell based on the time bias estimated value and the preset configuration, and generates a first estimated value of time bias/frequency bias parameters by means of combination logic adjustment of input configuration parameters of a synchronization accelerator and using small-scale FFT/IFFT;
when the time-offset/frequency-offset parameter estimation module receives a second preset subframe preset by the pre-arrangement module, the first estimation value of the time-offset/frequency-offset parameter is adjusted through the service data processing module to generate a second estimation value of the time-offset/frequency-offset parameter and a residual value, the residual value is used as a priori parameter of the second estimation value of the time-offset/frequency-offset parameter to compensate the second preset subframe to generate compensation data, the time-offset/frequency-offset parameter estimation module carries out fine estimation on the time-offset/frequency-offset parameter of the compensation data, and the time-offset/frequency-offset fine adjustment value is output;
and the service data processing module is used for adjusting the time offset/frequency offset fine adjustment value to generate a data receiving signal, the scheduling configuration control module is used for monitoring downlink control information by receiving physical downlink control channel data based on the data receiving signal, and when the physical downlink control information is detected, the data transmitting/receiving execution module is used for scheduling downlink and uplink services to complete resynchronization under the connection state EDRX.
2. The method for resynchronizing a long term evolution terminal in a connected state of claim 1, further comprising:
based on the period configuration of the extended discontinuous reception, the data subframes, the starting positions of the received data and the length of the received data received in the resynchronization process are pre-arranged through the pre-arranging module, and a pre-arranging model is generated;
the pre-arranging model comprises a data receiving length containing a main synchronous signal/auxiliary synchronous signal, a time advance containing a data starting position of the main synchronous signal/auxiliary synchronous signal relative to an Onduce starting subframe head, a subframe number of time offset/frequency offset parameter estimation receiving data, and a time advance containing time offset/frequency offset parameter estimation receiving data relative to the Onduce starting subframe head.
3. The method for resynchronizing a long term evolution terminal in a connected state of claim 1, further comprising:
when the preset configuration of the serving cell is time division multiplexing in a non-multicast broadcast single frequency network, the first preset subframe received by the resynchronization module is set to be a zeroth subframe and a first subframe or a fifth subframe and a sixth subframe in cyclic subframes, and the second preset subframe received by the time bias/frequency bias parameter estimation module is adjusted based on the preset configuration;
when the preset configuration of the serving cell is time division multiplexing in a multicast and broadcast single frequency network, the first preset subframe received by the resynchronization module is set as a zeroth subframe and a first subframe or a fifth subframe and a sixth subframe in the cyclic subframes, and the second preset subframe received by the time bias/frequency bias parameter estimation module is set as a zeroth subframe and a first subframe or a fifth subframe and a sixth subframe in the cyclic subframes;
when the preset configuration of the service cell is that the frequency division multiplexing is performed on a non-multicast broadcast single frequency network, the first preset subframe received by the resynchronization module is set as a zeroth subframe and a fifth subframe in the cyclic subframes, and the second preset subframe received by the time offset/frequency offset parameter estimation module is set as any subframe;
when the preset configuration of the serving cell is that the frequency division multiplexing is in the multicast and broadcast single-frequency network, the first preset subframe received by the resynchronization module is set as a zeroth subframe and a fifth subframe in the cyclic subframe, and the second preset subframe received by the time offset/frequency offset parameter estimation module is set as a zeroth subframe, a fourth subframe, a fifth subframe and a ninth subframe in the cyclic subframe.
4. The method for resynchronizing a long term evolution terminal in a connected state of claim 1, further comprising:
when the time point interval of the long-term evolution terminal for receiving/transmitting data meets a threshold value, a sleep control module controls the long-term evolution terminal to sleep, the long-term evolution terminal closes the periodic subframe interruption, the fast clock is switched to the slow clock, and the time count of the slow clock is carried out;
and after the sleep control module detects a preset awakening time point, the sleep control module wakes up the module in the long-term evolution terminal, resumes periodic subframe interruption, and starts the receiving and sending processing of the scheduling data.
5. The device is characterized by comprising a long-term evolution terminal service module, a resynchronization module and a time offset/frequency offset parameter estimation module:
the long-term evolution terminal service module comprises a scheduling configuration control module, a data transmitting/receiving execution module and a service data processing module, and is used for downlink data receiving scheduling configuration, data receiving processing, uplink data transmitting scheduling configuration and radio frequency/digital front end control;
the resynchronization module is used for processing a preset first subframe containing the resynchronization data of the primary synchronization signal/the secondary synchronization signal of the serving cell and generating a first estimated value of the time offset/frequency offset parameter; the time offset/frequency offset parameter estimation module is used for carrying out time offset/frequency offset fine estimation on the downlink subframe data of the serving cell containing at least two cell specific reference signals and outputting a time offset/frequency offset fine adjustment value;
the long term evolution terminal service module: when the long-term evolution terminal wakes up from deep sleep, based on the time bias estimated value of the service cell during sleep, the pre-arrangement module presets the initial position of the long-term evolution terminal for receiving data and the length configuration thereof, generates preset configuration, based on the time bias estimated value and the preset configuration,
the resynchronization module receives a first preset subframe which is sent by the serving cell and contains the resynchronization data of a main synchronizing signal/auxiliary synchronizing signal of the serving cell, and generates a first estimated value of a time offset/frequency offset parameter by using a small-scale FFT/IFFT through the combination logic adjustment of input configuration parameters of a synchronous accelerator;
when the time-offset/frequency-offset parameter estimation module receives a second preset subframe preset by the pre-arrangement module, the first estimation value of the time-offset/frequency-offset parameter is adjusted through the service data processing module to generate a second estimation value of the time-offset/frequency-offset parameter and a residual value, the residual value is used as a priori parameter of the second estimation value of the time-offset/frequency-offset parameter to compensate the second preset subframe to generate compensation data, the time-offset/frequency-offset parameter estimation module carries out fine estimation on the time-offset/frequency-offset parameter of the compensation data, and the time-offset/frequency-offset fine adjustment value is output;
and the service data processing module is used for adjusting the time offset/frequency offset fine adjustment value to generate a data receiving signal, the scheduling configuration control module is used for monitoring downlink control information by receiving physical downlink control channel data based on the data receiving signal, and when the physical downlink control information is detected, the data transmitting/receiving execution module is used for scheduling downlink and uplink services to complete resynchronization under the connection state EDRX.
6. The resynchronization apparatus of claim 5, wherein the data transmission/reception execution module comprises a clock, a radio frequency module, a digital front end module:
the clock is used for periodically generating subframe interruption to drive the scheduling configuration control module to run according to a time sequence;
the radio frequency module is realized by an integrated circuit, and is used for converting an analog signal received by an antenna into a digital signal and transmitting the digital signal to the digital front-end module, and the radio frequency module is used for converting the digital signal of the digital front-end module into an analog signal and transmitting the analog signal at a transmitting antenna;
the digital front-end module is realized by an integrated circuit and is used for generating a processing signal after sampling rate conversion and filtering processing of the received digital signal, the digital front-end module is used for transmitting the processing signal to a downlink accelerator, the digital front-end module is used for generating a transmitting signal after sampling rate conversion and filtering processing of processing data of an uplink accelerator, and the digital front-end module is used for transmitting the transmitting signal to the radio frequency module.
7. The apparatus for resynchronizing a long term evolution terminal in a connected state according to claim 5, wherein the apparatus further comprises a pre-scheduling module, a sleep control module, and a data receiving configuration module:
the pre-arranging module is a software module and is used for generating a pre-arranging model;
the sleep control module is a software module and is used for controlling sleep threshold judgment, fast and slow clock switching and wake-up triggering of a slow clock preset time point module of the long-term evolution terminal;
the data receiving configuration module is a software module for periodically triggering and scheduling clocks and is used for sending data receiving configuration to the data sending/receiving execution module, and the data receiving configuration module is used for sending post-processing requirement parameter configuration to the resynchronization module, the time offset/frequency offset parameter estimation module and the service data processing module.
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