CN102098250A - Frequency offset processing method and device for multi-mode terminal - Google Patents

Frequency offset processing method and device for multi-mode terminal Download PDF

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Publication number
CN102098250A
CN102098250A CN2011100288640A CN201110028864A CN102098250A CN 102098250 A CN102098250 A CN 102098250A CN 2011100288640 A CN2011100288640 A CN 2011100288640A CN 201110028864 A CN201110028864 A CN 201110028864A CN 102098250 A CN102098250 A CN 102098250A
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frequency offset
frequency
offset estimating
scdma
multimode terminal
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刘俊英
黄珍
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ST Ericsson Semiconductor Beijing Co Ltd
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ST Ericsson Semiconductor Beijing Co Ltd
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Priority to CN2011100288640A priority Critical patent/CN102098250A/en
Publication of CN102098250A publication Critical patent/CN102098250A/en
Priority to PCT/CN2012/070564 priority patent/WO2012100709A1/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/0014—Carrier regulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices
    • H04W88/06—Terminal devices adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals

Abstract

The invention provides a frequency offset processing method and a frequency offset processing device for a multi-mode terminal. The multi-mode terminal generates a reference clock through a digital compensation crystal oscillator (DCXO) and at least supports communication with a first communication network and a time division-synchronization code division multiple access (TD-SCDMA) network. The method comprises the following steps that: the multi-mode terminal resides in the first communication network to detect that TD-SCDMA service is needed to be performed; the multi-mode terminal reads cell broadcast information in the TD-SCDMA network and performs frequency offset estimation by utilizing P-channel common control physical channel (P-CCPCH) of a time slot 0 to obtain a frequency offset estimation value; and the multi-mode terminal performs frequency offset compensation on the P-CCPCH data according to the frequency offset estimation value. The performance of various services of a TD-SCDMA system can be guaranteed when the multi-mode terminal resides in different systems.

Description

A kind of frequency deviation processing method of multimode terminal and device
Technical field
The invention belongs to moving communicating field, the frequency deviation processing method and the device of the multimode terminal of particularly a kind of employing digital compensation crystal oscillator (DCXO).
Background technology
At present, in the clock interface circuit of terminal, generally use the transceiver that comprises voltage controlled crystal oscillator (VCXO) or digital control crystal oscillator, self has temperature-compensation circuit VCXO, can compensate automatically because the frequency shift (FS) that variations in temperature causes.
Because the cost of digital compensation crystal oscillator (DCXO) is lower, volume is littler, therefore, begins successively to adopt DCXO to produce system's reference clock in terminal.But DCXO self is according to the function of the automatic regulating frequency of variations in temperature, and therefore, terminal is being carried out differently when professional, should consider because the frequency offset issues that variations in temperature is brought.
Particularly, for multimode terminal, when residing in, this multimode terminal needs to carry out TD-SCDMA in the different system (system that is different from TD-SCDMA) when professional, if untimely to frequency deviation compensate with or adjustment, can influence the miscellaneous service performance of TD-SCDMA system, and the scheme of how to carry out frequency offset processing at this kind situation is not provided in the prior art.
Summary of the invention
Technical problem to be solved by this invention provides a kind of frequency deviation processing method and device of multimode terminal, guarantees the miscellaneous service performance of TD-SCDMA system when multimode terminal resides in the different system.
For solving the problems of the technologies described above, it is as follows to the invention provides technical scheme:
A kind of frequency deviation processing method of multimode terminal, described multimode terminal produces reference clock by digital compensation crystal oscillator DCXO, and supports at least and the communicating by letter of first communication network and TD-SCDMA network that described method comprises:
Described multimode terminal resides in first communication network, detects to carry out the TD-SCDMA business;
Described multimode terminal reads the broadcast message of sub-district in the TD-SCDMA network, utilizes the P-CCPCH data of time slot 0 to carry out frequency offset estimating, obtains the frequency offset estimating value;
Described multimode terminal carries out compensate of frequency deviation according to described frequency offset estimating value to described P-CCPCH data.
Above-mentioned frequency deviation processing method wherein, also comprises: described multimode terminal is adjusted rf frequency according to described frequency offset estimating value.
Above-mentioned frequency deviation processing method, wherein, the step that described multimode terminal is adjusted rf frequency according to described frequency offset estimating value specifically comprises:
Whenever obtain a frequency offset estimating value, then described frequency offset estimating value is stored;
When the number of the frequency offset estimating value of storing reaches predetermined threshold, the frequency offset estimating value of storing is averaged processing, obtain frequency offset estimating mean value;
According to described frequency offset estimating mean value rf frequency is adjusted.
Above-mentioned frequency deviation processing method, wherein, described detecting need be carried out the TD-SCDMA business and comprised:
Detecting needs all available PLMN based on TD-SCDMA technology of search;
Detect the broadcast message that need read sub-district in the TD-SCDMA network;
Detecting needs gravity treatment or switches to sub-district in the TD-SCDMA network.
A kind of frequency offset processing device of multimode terminal, described multimode terminal produces reference clock by digital compensation crystal oscillator DCXO, and supports at least and the communicating by letter of first communication network and TD-SCDMA network that described device comprises:
Detection module is used for described multimode terminal and resides in first communication network, detects and need carry out the TD-SCDMA business;
Frequency deviation estimating modules is used for reading the broadcast message of TD-SCDMA network sub-district, utilizes the P-CCPCH data of time slot 0 to carry out frequency offset estimating, obtains the frequency offset estimating value;
The compensate of frequency deviation module is used for according to described frequency offset estimating value described P-CCPCH data being carried out compensate of frequency deviation.
Above-mentioned frequency offset processing device wherein, also comprises: the frequency deviation adjusting module is used for according to described frequency offset estimating value rf frequency being adjusted.
Above-mentioned frequency offset processing device, wherein, described frequency deviation adjusting module is further used for:
Whenever obtain a frequency offset estimating value, then described frequency offset estimating value is stored;
When the number of the frequency offset estimating value of storing reaches predetermined threshold, the frequency offset estimating value of storing is averaged processing, obtain frequency offset estimating mean value;
According to described frequency offset estimating mean value rf frequency is adjusted.
Above-mentioned frequency offset processing device, wherein, described detecting need be carried out the TD-SCDMA business and comprised:
Detecting needs all available PLMN based on TD-SCDMA technology of search;
Detect the broadcast message that need read sub-district in the TD-SCDMA network;
Detecting needs gravity treatment or switches to sub-district in the TD-SCDMA network.
Compared with prior art, the invention has the beneficial effects as follows:
In technique scheme of the present invention, when multimode terminal resides in first communication network, need carry out the TD-SCDMA business if detect, then read the broadcast message of sub-district in the TD-SCDMA network, utilize the P-CCPCH data of time slot 0 to carry out frequency offset estimating, then, described P-CCPCH data are carried out compensate of frequency deviation according to frequency offset estimation result, so, can guarantee the miscellaneous service performance of TD-SCDMA system when multimode terminal resides in the different system.
Description of drawings
Fig. 1 is the frequency deviation processing method flow chart according to the multimode terminal of the embodiment of the invention;
Fig. 2 is a TD-SCDMA system subframe structure schematic diagram;
Fig. 3 is the frequency offset processing structure drawing of device according to the multimode terminal of the embodiment of the invention.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, describe the present invention below in conjunction with the accompanying drawings and the specific embodiments.
Fig. 1 is the frequency deviation processing method flow chart according to the multimode terminal of the embodiment of the invention, and described multimode terminal produces reference clock by DCXO, and supports at least and the communicating by letter of first communication network and TD-SCDMA network.With reference to Fig. 1, described frequency deviation processing method comprises the steps:
Step 101: described multimode terminal resides in first communication network, detects to carry out the TD-SCDMA business;
Wherein, described detecting need be carried out the TD-SCDMA business and comprised:
Detecting needs all available PLMN based on TD-SCDMA technology of search;
Detect the broadcast message that need read sub-district in the TD-SCDMA network;
Detecting needs gravity treatment or switches to sub-district in the TD-SCDMA network.
Step 102: described multimode terminal reads the broadcast message of sub-district in the TD-SCDMA network, utilizes the P-CCPCH data of time slot 0 to carry out frequency offset estimating, obtains the frequency offset estimating value;
Step 103: described multimode terminal carries out compensate of frequency deviation according to described frequency offset estimating value to described P-CCPCH data.
Preferably, described multimode terminal is also adjusted rf frequency according to described frequency offset estimating value, specifically comprises:
Whenever obtain a frequency offset estimating value, then described frequency offset estimating value is stored;
When the number of the frequency offset estimating value of storing reaches predetermined threshold, the frequency offset estimating value of storing is averaged processing, obtain frequency offset estimating mean value;
According to described frequency offset estimating mean value rf frequency is adjusted.
Below provide an application example of above-mentioned frequency deviation processing method.
Suppose that described multimode terminal is the GSM/TD-SCDMA dual-mode terminal, described multimode terminal adopts the transceiver of DCXO, resides in gsm system, and in the time of need carrying out the TD-SCDMA business, according to different TD-SCDMA business, the workflow of its implementation is as follows:
(1) multimode terminal resides in the gsm system, when needing all available PLMN (public land mobile communication network) of search TD-SCDMA, multimode terminal detects Midamble (training sequence) sign indicating number of available descending synchronous code (SYNC-DL) and this data correspondence at first according to the data that receive; After detecting the TD-SCDMA sub-district, read the broadcast message of this sub-district correspondence, and on the broadcast channel (BCH) of this sub-district, calculate frequency deviation; The frequency deviation that last basis calculates is carried out compensate of frequency deviation and frequency deviation adjustment.
How detecting SYNC-DL sign indicating number and Midamble sign indicating number is the algorithm that TD-SCDMA system fundamental sum is known altogether, just repeats no more here.When reading cell broadcast information, utilize Primary Common Control Physical Channel (P-CCPCH) data of time slot 0 (TS0) to carry out frequency offset estimating, because P-CCPCH adopts the QPSK modulation all the time, in the field of business based on the frequency offset estimating of QPSK modulation is known algorithm, is that example describes with common a kind of algorithm here:
According to the structure of time slot (with reference to Fig. 2) of TD-SCDMA system subframe, the symbol of supposing to be positioned at after the demodulation P-CCPCH of Midamble sign indicating number front is r 1(i), the symbol that is positioned at the P-CCPCH of Midamble sign indicating number back is r 2(i), the symbol of declaring firmly that obtains based on demodulation symbol is respectively
Figure BDA0000045457890000041
With
Figure BDA0000045457890000042
It is as follows to utilize the P-CCPCH data of TS0 to carry out the process of frequency offset estimating:
At first, order
Figure BDA0000045457890000051
Wherein, conjugate operation is asked in conj () expression;
Then, with symbol conjugate multiplication before and after the Midamble:
Figure BDA0000045457890000053
J=1,2 is the sign indicating number Taoist monastic name, N is the symbol numbers of Midamble front or back;
Because P-CCPCH is mapped to two physical code channels, therefore, the conjugate multiplication result of two code channels is added up:
Figure BDA0000045457890000054
Obtaining frequency deviation value at last is:
Figure BDA0000045457890000055
Wherein,
Figure BDA0000045457890000056
Be plural number
Figure BDA0000045457890000057
Phase place, Q is a spreading factor, T cBe spreading rate.
After obtaining frequency deviation value, dual-mode terminal just can utilize the frequency deviation value that estimates that current demodulated symbols is compensated, and its compensation method has multiple, is example with wherein a kind of method:
The offset of preceding m the data of Midamble sign indicating number is
Figure BDA0000045457890000058
The offset of m data is behind the Midamble sign indicating number
Figure BDA0000045457890000059
Then the data after the compensation are:
Figure BDA00000454578900000510
J is an imaginary unit.
After carrying out compensate of frequency deviation, multimode terminal just can utilize the operation such as decode of the data after the compensation.
Whenever obtain a frequency offset estimating value, dual-mode terminal is stored this frequency offset estimating value.When M frequency deviation value stored in accumulation into, physical layer averages processing with the individual frequency deviation value of this M (M can adjust according to specific implementation, and its span is preferably [1,12]), and mean value reported high level, utilize this mean value radio frequency to be carried out the adjustment of frequency for high-rise.
(2) multimode terminal resides in the gsm system, in the time of need reading the TD-SCDMA broadcast message, at first calculates frequency deviation value on broadcast channel, carries out compensate of frequency deviation and frequency deviation adjustment according to the frequency deviation that calculates then.
Professional (2) are with the difference of professional (1), professional (1) does not know available TD-SCDMA cell information, need carry out the full frequency band search, and professional (2) has known the TD-SCDMA cell information, do not need to carry out again the full frequency band search, only need read the broadcast channel of this sub-district.In addition, it is the same with above-mentioned business (1) that the frequency deviation estimating method that uses in professional (2), compensate of frequency deviation and frequency deviation are adjusted strategy, just repeats no more here.
(3) multimode terminal resides in the gsm system, when needing gravity treatment or switching to the TD-SCDMA sub-district, at first detects available SYNC-DL sign indicating number and corresponding Midamble sign indicating number; Read the broadcast message of this sub-district correspondence then, and on the broadcast channel of this sub-district, calculate frequency deviation; The frequency deviation that last basis calculates is carried out compensate of frequency deviation and frequency deviation adjustment.
It is the same with above-mentioned business (1) that the frequency deviation estimating method that uses in professional (3), compensate of frequency deviation and frequency deviation are adjusted strategy, just repeats no more here.
Corresponding to above-mentioned frequency deviation processing method, the embodiment of the invention also provides a kind of frequency offset processing device.
Fig. 3 is the frequency offset processing structure drawing of device according to the multimode terminal of the embodiment of the invention, and described multimode terminal produces reference clock by DCXO, and supports at least and the communicating by letter of first communication network and TD-SCDMA network.With reference to Fig. 3, described frequency offset processing device comprises:
Detection module 10 is used for described multimode terminal and resides in first communication network, detects and need carry out the TD-SCDMA business;
Frequency deviation estimating modules 20 is used for reading the broadcast message of TD-SCDMA network sub-district, utilizes the P-CCPCH data of time slot 0 to carry out frequency offset estimating, obtains the frequency offset estimating value;
Compensate of frequency deviation module 30 is used for according to described frequency offset estimating value described P-CCPCH data being carried out compensate of frequency deviation.
Preferably, described frequency offset processing device also comprises frequency deviation adjusting module (figure does not show), is used for according to described frequency offset estimating value rf frequency being adjusted, and is specially:
Whenever obtain a frequency offset estimating value, then described frequency offset estimating value is stored;
When the number of the frequency offset estimating value of storing reaches predetermined threshold, the frequency offset estimating value of storing is averaged processing, obtain frequency offset estimating mean value;
According to described frequency offset estimating mean value rf frequency is adjusted.
Wherein, described detecting need be carried out the TD-SCDMA business and comprised:
Detecting needs all available PLMN based on TD-SCDMA technology of search;
Detect the broadcast message that need read sub-district in the TD-SCDMA network;
Detecting needs gravity treatment or switches to sub-district in the TD-SCDMA network.
In the technique scheme of the embodiment of the invention, when multimode terminal resides in first communication network, need carry out the TD-SCDMA business if detect, then read the broadcast message of sub-district in the TD-SCDMA network, utilize the P-CCPCH data of time slot 0 to carry out frequency offset estimating, then, described P-CCPCH data are carried out compensate of frequency deviation according to frequency offset estimation result, so, can guarantee the miscellaneous service performance of TD-SCDMA system when multimode terminal resides in the different system.
Should be noted that at last, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement technical scheme of the present invention, and not breaking away from the spiritual scope of technical solution of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.

Claims (8)

1. the frequency deviation processing method of a multimode terminal, described multimode terminal produces reference clock by digital compensation crystal oscillator DCXO, and supports at least and the communicating by letter of first communication network and TD-SCDMA network, and it is characterized in that, comprising:
Described multimode terminal resides in first communication network, detects to carry out the TD-SCDMA business;
Described multimode terminal reads the broadcast message of sub-district in the TD-SCDMA network, utilizes the P-CCPCH data of time slot 0 to carry out frequency offset estimating, obtains the frequency offset estimating value;
Described multimode terminal carries out compensate of frequency deviation according to described frequency offset estimating value to described P-CCPCH data.
2. frequency deviation processing method as claimed in claim 1 is characterized in that, also comprises:
Described multimode terminal is adjusted rf frequency according to described frequency offset estimating value.
3. frequency deviation processing method as claimed in claim 2 is characterized in that, the step that described multimode terminal is adjusted rf frequency according to described frequency offset estimating value specifically comprises:
Whenever obtain a frequency offset estimating value, then described frequency offset estimating value is stored;
When the number of the frequency offset estimating value of storing reaches predetermined threshold, the frequency offset estimating value of storing is averaged processing, obtain frequency offset estimating mean value;
According to described frequency offset estimating mean value rf frequency is adjusted.
4. frequency deviation processing method as claimed in claim 1 is characterized in that, described detecting need be carried out the TD-SCDMA business and comprised:
Detecting needs all available PLMN based on TD-SCDMA technology of search;
Detect the broadcast message that need read sub-district in the TD-SCDMA network;
Detecting needs gravity treatment or switches to sub-district in the TD-SCDMA network.
5. the frequency offset processing device of a multimode terminal, described multimode terminal produces reference clock by digital compensation crystal oscillator DCXO, and supports at least and the communicating by letter of first communication network and TD-SCDMA network, and it is characterized in that, comprising:
Detection module is used for described multimode terminal and resides in first communication network, detects and need carry out the TD-SCDMA business;
Frequency deviation estimating modules is used for reading the broadcast message of TD-SCDMA network sub-district, utilizes the P-CCPCH data of time slot 0 to carry out frequency offset estimating, obtains the frequency offset estimating value;
The compensate of frequency deviation module is used for according to described frequency offset estimating value described P-CCPCH data being carried out compensate of frequency deviation.
6. frequency offset processing device as claimed in claim 1 is characterized in that, also comprises:
The frequency deviation adjusting module is used for according to described frequency offset estimating value rf frequency being adjusted.
7. frequency offset processing device as claimed in claim 6 is characterized in that, described frequency deviation adjusting module is further used for:
Whenever obtain a frequency offset estimating value, then described frequency offset estimating value is stored;
When the number of the frequency offset estimating value of storing reaches predetermined threshold, the frequency offset estimating value of storing is averaged processing, obtain frequency offset estimating mean value;
According to described frequency offset estimating mean value rf frequency is adjusted.
8. frequency offset processing device as claimed in claim 5 is characterized in that, described detecting need be carried out the TD-SCDMA business and comprised:
Detecting needs all available PLMN based on TD-SCDMA technology of search;
Detect the broadcast message that need read sub-district in the TD-SCDMA network;
Detecting needs gravity treatment or switches to sub-district in the TD-SCDMA network.
CN2011100288640A 2011-01-26 2011-01-26 Frequency offset processing method and device for multi-mode terminal Pending CN102098250A (en)

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CN112383498A (en) * 2020-11-17 2021-02-19 紫光展锐(重庆)科技有限公司 Low-frequency clock compensation method and device, storage medium and terminal
WO2022262248A1 (en) * 2021-06-17 2022-12-22 展讯通信（上海）有限公司 Frequency offset control method and apparatus, terminal, and storage medium
CN115913441A (en) * 2023-01-09 2023-04-04 北京智芯微电子科技有限公司 Multimode communication module clock frequency offset joint estimation method and initial frequency offset calibration method

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Application publication date: 20110615