Classifications

• • 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
  • H04W52/0261—Power saving arrangements in terminal devices managing power supply demand, e.g. depending on battery level
  • H04W52/0287—Power saving arrangements in terminal devices managing power supply demand, e.g. depending on battery level changing the clock frequency of a controller in the equipment
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04W—WIRELESS COMMUNICATION NETWORKS
  • H04W56/00—Synchronisation arrangements
  • H04W56/0035—Synchronisation arrangements detecting errors in frequency or phase
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
  • Y02D30/00—Reducing energy consumption in communication networks
  • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

• the present invention relates to the field of communications technologies, and in particular, to a method and terminal for acquiring a frequency difference.
• the general mobile phone will design two clocks, one is the high-speed cuckoo clock, which is used for working mode and receiving network paging mode; the other is low-speed cuckoo clock, used for sleep mode.
• the mobile phone is in the working mode and receives the network paging mode, and can receive the chime synchronization information sent by the base station, and the phase locked loop of the mobile phone can synchronize the frequency of the high-speed chime of the mobile phone to the frequency of the base station chime, thereby maintaining the mobile phone and the mobile phone. Stable communication between base stations.
• the mobile phone If the mobile phone is in sleep mode, if the low-speed clock is not synchronized to the base station's clock, the mobile phone must first perform the chime synchronization before receiving the network page next time before receiving the network page. When the mobile phone is in sleep mode, if the low speed chirp clock is also synchronized to the base station chime, then the mobile phone must calculate the frequency difference between the low speed chirp clock and the high speed chirp clock, and then maintain the mobile phone after the sleep, using the low speed chirp clock plus the frequency difference compensation.
• the low speed chirp clock is also synchronized to the base station chime
• FIG. 1 is a schematic diagram of the inter-turn time of obtaining the frequency difference between the low-speed cuckoo clock and the base station cuckoo clock in the prior art.
• the frequency difference between the low speed chirp clock and the high speed chirp clock is obtained.
• the low speed chirp clock is added to the frequency difference compensation to maintain the fixed position of the mobile phone.
• the embodiment of the present invention provides a method for acquiring a frequency difference and a terminal, which can obtain a frequency difference between a relatively accurate low speed clock and a base station clock.
• An embodiment of the present invention provides a method for acquiring a frequency difference, including:
• the embodiment of the present invention further provides a terminal, including:
• a first acquiring module configured to receive a cell frame fixed by the base station before the dormancy, and set a cell frame fixed by the base station to a frame fixed before the dormancy to obtain a pre-hibernation clock
• the difference between the fixed and the base station is determined by the difference T1;
• the recording module is used to record the sleep time between the start and the end of the sleep
• a second acquiring module configured to: after the dormancy, search for a cell frame fixed by the base station; and replace the searched cell frame with the cell frame fixed in the dormant state; and determine the replaced cell frame
• the frame maintained after sleep is determined as the difference, and the difference between the clock after the sleep and the base station is determined to be ⁇ 2;
• the calculation module is configured to calculate the frequency difference between the low-speed cuckoo clock and the base station cuckoo clock according to the normalized frequency and Tl, ⁇ , ⁇ 2.
• the implementation of the present invention acquires the frequency difference between the low-speed clock and the base station clock based on the fixed difference between the terminal and the base station before and after the sleep, and the frequency difference obtained due to the long sleep period. More precise than the prior art.
• FIG. 1 is a schematic diagram of a time difference between a low speed cuckoo clock and a base station chirp clock in the prior art
• FIG. 2 is a flowchart of a method for acquiring a frequency difference according to an embodiment of the present invention
• Figure 3 is a schematic diagram of the time between the fixed and the fixed base station before and after the terminal is hibernated
• FIG. 4A is a schematic diagram 1 of a logical structure of a terminal according to an embodiment of the present invention.
• FIG. 4B is a schematic diagram 2 of a logical structure of a terminal according to an embodiment of the present invention.
• FIG. 4C is a third schematic diagram of a logical structure of a terminal according to an embodiment of the present invention.
• An embodiment of the present invention provides a method and a terminal for acquiring a frequency difference, which can obtain a frequency difference between a relatively low speed clock and a base station clock.
• FIG. 2 is a flowchart of a method for acquiring a frequency difference according to an embodiment of the present invention. As shown
• the method for obtaining the frequency difference may include:
• Step 201 Obtain the difference T1 between the clock setting before the sleep and the base station.
• the difference T1 between the clock and the base station is determined to be: [39] before the terminal is in sleep, that is, the terminal is in the working mode or is in the receiving network paging mode. ⁇ , receiving a cell frame fixed by the base station;
• the cell frame sent by the base station is fixed minus the frame preset maintained by the terminal (in the working mode or in the receiving network paging mode), and the clock setting and the base station are determined before the terminal is hibernated. The difference between Tl.
• Step 202 Record the sleep time between the start and the end of the sleep.
• the terminal records the sleep period from the moment when the sleep starts, until the terminal wakes up from the sleep state to the working mode. Or receive the network paging mode, end sleep, and get the sleep between sleep and sleep.
• Step 203 Obtain the difference T2 between the dormant clock and the base station.
• the acquisition of ⁇ 2 can be:
• the frequency of the low-speed cuckoo clock is very different from the frequency of the base station's cuckoo clock, the value of ⁇ 2 will be too large after the terminal wakes up, which will cause the terminal to be unable to search for the cell frame in a certain range of time.
• the cell search process is to be restarted to obtain cell frame definitions and other information.
• the time of cell search is much larger than the time of frame-based search.
• Frame-fixed search is based on the known cell frame, and the exact frame is searched in a certain window. This window cannot be too large, too much.
• the search calculation is multiplied; it can't be too small. Too small a high precision for the low speed cuckoo clock.
• Step 204 Calculate the frequency difference between the low-speed cuckoo clock and the base station cuckoo clock according to the normalized frequency and Tl, ⁇ , ⁇ 2.
• FIG. 3 is a schematic diagram of the time between the fixed and the fixed base station before and after the terminal is hibernated. Assume that the terminal is in the working mode or in the receiving network paging mode before the sleep. The cell frame sent by the base station is fixed, and the cell frame sent by the base station is fixed minus the frame fixed by the terminal in the working mode or in the receiving network paging mode, and the clock setting before the terminal sleeps is obtained. The difference T1 between the base stations and the clock.
• the terminal enters the sleep state, and uses the low-speed chime frequency to maintain the frame of the terminal; when the terminal wakes up from the sleep state to the working mode or receives the network paging mode, the cell frame sent by the base station is searched within a certain time range. ;
• the frame of the replaced cell is subtracted from the frame fixed by the terminal in the working mode or in the receiving network paging mode, and the clock setting after the terminal is hibernated is obtained between the terminal and the base station.
• the difference is ⁇ 2.
• the terminal records the sleep period from the moment when the sleep starts, until the terminal wakes up from the sleep state to the working mode or receives the network paging mode, ends the sleep, and obtains the sleep between the sleep start and the sleep end. .
• T1 should be equal to ⁇ 2.
• T1 and ⁇ 2 which is equal to the normalized frequency ⁇ of the base station and the normalized frequency ⁇ 1 of the low-speed cuckoo clock. The difference.
• Af represents the difference between the low-speed chirp frequency of the terminal in the sleep state and the base station chirp frequency.
• T2-T1 represents the phase deviation value of the low-speed chopping clock frequency in the sleep time T and the chirp clock frequency of the base station;
• the low-speed chirp clock frequency plus the Af is fixed and compensated, and the quasi-determination of the terminal can be obtained, thereby realizing the synchronization between the terminal chirp clock and the base station chime, that is, according to the corresponding low-speed chirp clock.
• the frequency difference from the base station chime clock synchronizes the low speed chirp of the terminal with the base station chime.
• a method for acquiring a frequency difference provided by an embodiment of the present invention is described in detail.
• the implementation of the invention obtains the frequency difference between the low-speed clock and the base station ⁇ clock according to the fixed ⁇ difference between the terminal and the base station before and after the sleep. Because the terminal sleeps longer, the acquired frequency difference is relatively accurate, thereby maintaining the accuracy of the terminal. Fixed.
• FIG. 4A and FIG. 4B are schematic diagrams showing the logical structure of a terminal according to an embodiment of the present invention.
• the terminal provided by the embodiment of the present invention may include:
• the first obtaining module 401 is configured to: before the dormancy, receive a cell frame fixed by the base station; and determine a cell frame sent by the base station and a frame fixed before the dormancy to obtain a difference between the frame and the pre-hibernation frame.
• a recording module 402 configured to record a sleep time T between the start and the end of the sleep
• the second obtaining module 403 is configured to: after the dormancy, search for a cell frame fixed by the base station; and replace the searched cell frame with the cell frame fixed in the dormant state; and determine the replaced cell frame. Comparing with the frame fixed after the sleep, the difference T2 between the dormant clock and the base station clock is obtained;
• the calculation module 404 is configured to calculate a frequency difference between the low speed cuckoo clock and the base station chime according to the normalized frequency and Tl, ⁇ , ⁇ 2.
• Af represents the difference between the low-speed chirp frequency of the terminal in the sleep state and the chirp clock frequency of the base station
• T2-T1 represents the phase deviation of the low-speed chirp frequency in the sleeptime T and the chirp clock frequency of the base station.
• Value represents the percentage difference between the low-speed chopping clock frequency in the sleep time T and the frequency difference of the base station chirp clock.
• the first acquiring module 401 may specifically include:
• the receiving module 4011 is configured to receive a cell frame fixed by the base station before the dormant;
• the first subtraction module 4012 is configured to perform a difference between the cell frame fixed by the base station and the frame fixed before the sleep, and obtain a difference T1 between the clock before the sleep and the base station. .
• the second obtaining module 403 includes:
• a search module 4031 configured to search for a cell frame sent by the base station after sleeping
• an update module 4032 configured to update a cell frame maintained in a dormant state to a cell frame definition searched by the search module;
• the second subtraction module 4033 is configured to determine the difference between the updated cell frame and the frame after sleep maintenance.
• the calculation module 404 may specifically include:
• Normalization module 4041 for normalizing the low speed chirp frequency
• a third subtraction module 4042 configured to perform a difference between the ⁇ 2 and the T1 to obtain a phase deviation value in the dormant ⁇ ;
• the dividing module 4043 is configured to divide the phase deviation value obtained by the third subtracting module 4042 by the sleep time ⁇ recorded by the recording module 402 to obtain a frequency difference percentage;
• the product module 4044 is configured to multiply the frequency difference percentage obtained by the dividing module 4043 with the low speed chirp clock normalized by the normalization module 4041 to obtain a low speed chime clock and a base station chirp clock.
• the normalization module 4041 is configured to normalize the base station chirp frequency
• the product module 4044 is configured to multiply the frequency difference percentage obtained by the dividing module 4043 by the normalized base station chirp clock frequency to obtain a frequency difference between the low speed chirp clock and the base station chirp clock.
• a terminal provided by the embodiment of the present invention is described in detail.
• the implementation of the invention obtains the frequency difference between the low-speed clock and the base station clock according to the fixed difference between the terminal and the base station before and after the sleep, and the frequency difference obtained is relatively accurate because the terminal sleeps longer.
• the corresponding calculation module 404 can also be connected to the synchronization processing module 405, and the synchronization processing module 405 is configured to use the low speed chime clock and the base station chirp clock obtained by the calculation module 404.
• the rate difference is used to achieve synchronization between the low-speed clock of the terminal and the base station clock.

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• Engineering & Computer Science (AREA)
• Computer Networks & Wireless Communication (AREA)
• Signal Processing (AREA)
• Mobile Radio Communication Systems (AREA)
• Synchronisation In Digital Transmission Systems (AREA)

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• 2008
  • 2008-11-19 CN CN2008101770412A patent/CN101431816B/zh active Active
• 2009
  • 2009-10-26 EP EP09827157.0A patent/EP2337421B1/de active Active
  • 2009-10-26 WO PCT/CN2009/074621 patent/WO2010057408A1/zh active Application Filing
• 2011
  • 2011-05-16 US US13/108,608 patent/US8437701B2/en active Active

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