WO2012059035A1 - 终端频率偏移检测方法、装置及系统 - Google Patents

终端频率偏移检测方法、装置及系统 Download PDF

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Publication number
WO2012059035A1
WO2012059035A1 PCT/CN2011/081583 CN2011081583W WO2012059035A1 WO 2012059035 A1 WO2012059035 A1 WO 2012059035A1 CN 2011081583 W CN2011081583 W CN 2011081583W WO 2012059035 A1 WO2012059035 A1 WO 2012059035A1
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Prior art keywords
frequency offset
terminal
detected
value
detection
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PCT/CN2011/081583
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English (en)
French (fr)
Inventor
郭宏伟
张贤孝
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Priority to EP11837561.7A priority Critical patent/EP2632064B1/en
Publication of WO2012059035A1 publication Critical patent/WO2012059035A1/zh
Anticipated expiration legal-status Critical
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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03828—Arrangements for spectral shaping; Arrangements for providing signals with specified spectral properties
    • H04L25/03866—Arrangements for spectral shaping; Arrangements for providing signals with specified spectral properties using scrambling
    • 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
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
    • H04L27/20—Modulator circuits; Transmitter circuits
    • H04L27/2032—Modulator circuits; Transmitter circuits for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner
    • H04L27/2053—Modulator circuits; Transmitter circuits for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner using more than one carrier, e.g. carriers with different phases
    • H04L27/206—Modulator circuits; Transmitter circuits for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner using more than one carrier, e.g. carriers with different phases using a pair of orthogonal carriers, e.g. quadrature carriers
    • H04L27/2067—Modulator circuits; Transmitter circuits for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner using more than one carrier, e.g. carriers with different phases using a pair of orthogonal carriers, e.g. quadrature carriers with more than two phase states
    • H04L27/2089—Modulator circuits; Transmitter circuits for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner using more than one carrier, e.g. carriers with different phases using a pair of orthogonal carriers, e.g. quadrature carriers with more than two phase states with unbalanced quadrature channels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
    • H04L27/22—Demodulator circuits; Receiver circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
    • H04L27/22—Demodulator circuits; Receiver circuits
    • H04L27/227—Demodulator circuits; Receiver circuits using coherent demodulation
    • H04L27/2271—Demodulator circuits; Receiver circuits using coherent demodulation wherein the carrier recovery circuit uses only the demodulated signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/0014—Carrier regulation
    • H04L2027/0044—Control loops for carrier regulation
    • H04L2027/0063—Elements of loops
    • H04L2027/0065—Frequency error detectors

Definitions

  • the invention relates to a Chinese patent application filed on November 1, 2010 by the Chinese Patent Office, the application number is 201010532088.3, and the invention is entitled "terminal frequency offset detection method, device and system". Priority is hereby incorporated by reference in its entirety.
  • the present invention relates to the field of wireless communication technologies, and in particular, to a terminal frequency offset detection method, apparatus, and system.
  • VAMOS Voice services over Adaptive Multi-user Channels on One Slot
  • GSM global mobile cellular communication
  • VAMOS technology can multiplex voice services corresponding to two voice users on a half-rate or full-rate wireless channel.
  • the VAMOS technology can multiplex the voice services of the two GSM terminals of the same cell to the same service channel, thereby improving the GSM capacity.
  • Embodiments of the present invention provide a terminal frequency offset detection method, apparatus, and system, to detect whether a frequency offset abnormality occurs when a terminal performs VAMOS multiplexing.
  • a method for detecting a terminal frequency offset comprising:
  • the downlink signal of the to-be-detected voice service channel corresponding to the detection terminal is scrambled by the adaptive quadrature phase shift keying modulation technique
  • a base transceiver station is also provided, including:
  • a scrambling module configured to perform scrambling on a downlink signal of the to-be-detected voice traffic channel corresponding to the detection terminal by using an adaptive quadrature phase shift keying modulation technique
  • a detecting module configured to perform frequency offset detection on an uplink signal on the to-be-detected voice traffic channel that is scrambled by the scrambling module, to obtain a frequency offset detection result of an uplink signal of the to-be-detected voice traffic channel;
  • the first sending module is configured to send the frequency offset detection result obtained by the detecting module to the base station controller.
  • a method for detecting a terminal frequency offset comprising: receiving, by a base transceiver station, a frequency offset of an uplink signal on a scrambled voice traffic channel to be detected sent by the base transceiver station Detecting the obtained frequency offset detection node, where the to-be-detected voice traffic channel is a voice traffic channel corresponding to the terminal to be detected;
  • a base station controller is also provided, including:
  • a second receiving module configured to receive, by the base transceiver station, the base transceiver station to perform scrambling
  • the frequency offset detection result obtained by the frequency offset detection of the uplink signal on the to-be-detected voice traffic channel, the to-be-detected voice traffic channel is a voice traffic channel corresponding to the to-be-detected terminal; and an obtaining module, configured to use the frequency according to the frequency
  • the offset detection result knows whether an abnormality occurs in the frequency offset of the terminal to be detected.
  • a terminal frequency offset detection system including any base station transceiver station provided by the embodiment of the present invention and any base station controller provided by the embodiment of the present invention.
  • the base station transceiver station performs scrambling on the downlink signal of the to-be-detected voice traffic channel corresponding to the detecting terminal, and then uplinks on the scrambled voice traffic channel to be detected.
  • the signal is subjected to frequency offset detection, so that the frequency offset detection result of the uplink signal of the to-be-detected voice traffic channel is obtained when the downlink signal of the to-be-detected voice traffic channel is multiplexed, and the detection result is sent to the base station controller.
  • the base station controller is made aware of whether an abnormality occurs in the frequency offset when the terminal to be detected participates in the VAMOS technology.
  • FIG. 1 is a flowchart of a terminal frequency offset detecting method according to an embodiment of the present invention
  • FIG. 2 is a flowchart of a terminal frequency offset detecting method according to another embodiment of the present invention
  • FIG. 4 is a schematic diagram of a base transceiver station according to an embodiment of the present invention
  • FIG. 5 is a schematic diagram of a base transceiver station according to another embodiment of the present invention.
  • FIG. 6 is a schematic diagram of a base station controller according to an embodiment of the present invention.
  • FIG. 7 is a schematic diagram of a base station controller according to another embodiment of the present invention.
  • FIG. 1 is a flowchart of a terminal frequency offset detection method according to an embodiment of the present invention. As shown in FIG. 1 , the method includes:
  • Step 101 Perform scrambling on the downlink signal of the to-be-detected voice traffic channel corresponding to the detection terminal by the adaptive quadrature phase shift keying modulation technique.
  • the embodiment of the present invention can be applied to the GSM system.
  • the terminal to be detected in this embodiment may be a terminal supporting the GSM standard.
  • the following uses a GSM terminal as an example for description.
  • the VAMOS technology can support the participation of existing GSM terminals, and the GSM terminal may experience a frequency offset abnormality when receiving the voice service multiplexed using the VAMOS technology, thereby affecting the voice quality.
  • GSM terminals that may be abnormal may be identified in advance in order to take protective measures against these GSM terminals. When these GSM terminals are protected, the GSM terminals can be made in VAMOS technology. No abnormalities occur or fewer abnormalities occur to ensure voice quality.
  • the GSM terminal When a GSM terminal is in a normal voice service call, the GSM terminal can be detected.
  • the GSM terminal is the terminal to be detected, and the voice service channel corresponding to the GSM terminal is the voice service channel to be detected.
  • the base station system (hereinafter referred to as BSS) can detect any GSM terminal that is conducting a voice service call, and the BSS can determine the terminal to be detected as needed.
  • the BSS includes a Base Station Controller (hereinafter referred to as BSC) and a Base Transceiver Station (BTS).
  • BSC Base Station Controller
  • BTS Base Transceiver Station
  • the BSS After determining the terminal to be detected, the BSS obtains the device type identifier of the terminal to be detected and the channel identifier of the voice service channel corresponding to the to-be-detected terminal.
  • the device type identifier of the terminal is used to identify the type of each terminal.
  • the device type identifier may be a type allocation code (International Allocation Code (IMEI) in the International Mobile Equipment Identity (IMEI). : TAC ).
  • IMEI International Allocation Code
  • TAC International Mobile Equipment Identity
  • the characteristics of the same type of GSM terminal can be considered to be the same, and the embodiment of the present invention
  • the channel identifier of the voice traffic channel may be a traffic channel number, and the traffic channel number is used to uniquely identify a voice traffic channel.
  • the BSS determines to detect a GSM terminal that is performing normal voice service, it may be determined by the BTS or determined by the BSC. After being determined by the BTS, the BTS directly scrambles the downlink signal of the voice traffic channel to be detected by the Adaptive Quadrature Phase Shift Keying (AQPSK) modulation technique. After being determined by the BSC, the BSC sends detection indication signaling to the BTS to instruct the BTS to scramble the voice service channel to be detected. The method of scrambling can be performed by using AQPSK modulation technology.
  • AQPSK Adaptive Quadrature Phase Shift Keying
  • Step 102 Perform frequency offset detection on the uplink signal on the scrambled voice traffic channel to obtain a frequency offset detection result of the uplink signal of the voice traffic channel to be detected.
  • the BTS performs frequency offset detection on the uplink signal on the scrambled voice traffic channel.
  • the BTS can obtain the frequency offset detection result of the uplink signal of the voice service channel after the downlink signal of the voice traffic channel to be detected is scrambled.
  • the frequency offset detection result may be a frequency offset value or a frequency offset change value of the uplink signal, or the frequency offset detection result may be a detection result of whether the frequency offset of the to-be-detected terminal is abnormal.
  • Step 103 Send the frequency offset detection result to the base station controller.
  • the BTS can send the above frequency offset detection result to the BSC by detecting the result signaling.
  • the detection result may further include identification information of the voice traffic channel to be detected.
  • the BSC may calculate a result of whether the frequency offset is abnormal according to the frequency offset value or the frequency offset change value;
  • the BSC can directly obtain whether the frequency offset has an abnormality without calculation. Then, the BSC results according to whether the frequency offset is abnormal, and according to the identifier of the voice traffic channel Information, it can be known whether the terminal and the terminal of the same type as the terminal participate in the VAMOS technology, whether the frequency offset will be abnormal.
  • the GSM terminal After detecting that a certain type of GSM terminal is abnormal in participating in the VAMOS technology, the GSM terminal can take protective measures when the GSM terminal actually participates in the VAMOS technology.
  • the GSM terminal when the GSM terminal performs normal voice service, the GSM terminal is detected without affecting the normal voice service of the GSM terminal.
  • the base transceiver station performs scrambling on the downlink signal of the to-be-detected voice service channel corresponding to the detection terminal, and then performs frequency offset detection on the uplink signal on the scrambled voice traffic channel to be detected, thereby obtaining the
  • the base station controller knows and detects the downlink signal. Whether the frequency offset of the terminal will be abnormal when participating in the VAMOS technology.
  • FIG. 2 is a flowchart of a method for detecting a terminal frequency offset according to another embodiment of the present invention. As shown in FIG. 2, the method includes:
  • Step 201 Receive a frequency offset detection result that is sent by the base transceiver station and perform frequency offset detection on the uplink signal on the to-be-detected voice service channel that is sent by the base transceiver station.
  • the to-be-detected voice service channel is the terminal to be detected. Corresponding voice traffic channel.
  • the BTS performs scrambling on the detected voice service information, and performs frequency offset detection on the uplink signal on the scrambled voice traffic channel to be detected, obtains a frequency offset detection result, and then the BTS sends the frequency offset detection result to the BTS.
  • BSC Base Station Controller
  • Step 202 Obtain, according to the frequency offset detection result, whether an abnormality occurs in a frequency offset of the terminal to be detected.
  • the BSC may calculate a result of whether the frequency offset is abnormal according to the frequency offset value or the frequency offset change value;
  • the offset detection result is a result of whether the frequency offset is abnormal
  • the BSC can directly obtain the result of whether the frequency offset is abnormal without calculation.
  • the BSC knows whether the frequency offset will be abnormal when the terminal and the terminal of the same type as the terminal participate in the VAMOS technology.
  • the detection result may be added to the frequency offset detection database together with the device type identifier of the terminal corresponding to the detection result. That is to say, in the frequency offset detection database, the detection result of each type of GSM terminal detected may be stored; the detection result indicates whether the frequency offset of the certain type of GSM terminal is abnormal when participating in the VAMOS technology.
  • the type of the GSM terminal is determined by the device type identifier, which is, for example, the TAC code in the IMEI identifier.
  • the frequency offset detection database can be indexed by TAC.
  • the BSC may first query the frequency offset database for the detection result stored in the terminal of the type, when the terminal of the type is not queried.
  • step 201 and step 202 are performed.
  • the base station controller receives the frequency offset detection result sent by the base transceiver station, and the frequency offset detection result is performed by the base transceiver station to perform frequency offset detection on the uplink signal on the scrambled voice traffic channel after the scrambling
  • the base station controller obtains, according to the frequency offset detection result, whether the frequency offset of the to-be-detected terminal corresponding to the to-be-detected voice traffic channel is abnormal when participating in the VAMOS technology.
  • FIG. 3 is a flowchart of a method for detecting a terminal frequency offset according to still another embodiment of the present invention. As shown in FIG. 3, the method includes:
  • Step 301 The BSC sends a first signaling to the BTS.
  • the first signaling includes a cell for indicating frequency offset detection of the voice traffic channel to be detected.
  • the first signaling may further include a channel identifier of the voice traffic channel to be detected.
  • the terminal to be detected may be, for example, a GSM terminal
  • the voice traffic channel to be detected may be, for example, a voice traffic channel corresponding to the GSM terminal.
  • the BSC determines that a GSM terminal that is performing normal voice service is frequency-biased During the detection, the BSC obtains the channel identifier of the voice traffic channel corresponding to the GSM terminal, and the channel identifier is, for example, a traffic channel number. Then, the BSC can send the detection indication signaling that includes the foregoing channel identifier to the BTS through the Abis interface, and is used to instruct the BTS to perform frequency offset detection on the voice traffic channel corresponding to the channel identifier.
  • the Abis interface is a communication interface between the BSC and the BTS.
  • the BTS determines that a frequency offset detection is to be performed on a GSM terminal, the BTS can directly perform frequency offset detection on the voice traffic channel corresponding to the GSM terminal without receiving an indication of the BSC.
  • Step 302 The BTS performs scrambling on the downlink signal of the to-be-detected voice service channel corresponding to the detection terminal by using the AQPSK modulation technology.
  • the BTS After the BTS receives the detection indication signaling sent by the BSC or the BTS directly triggers the frequency offset detection on a certain terminal, the BTS scrambles the downlink signal of the voice service channel corresponding to the terminal, and the scrambling method can adopt the AQPSK modulation.
  • the technology simulates the situation that the GSM terminal corresponding to the voice service channel participates in the VAMOS technology, thereby performing frequency offset detection on the uplink signal sent by the GSM terminal.
  • the downlink signal of the voice traffic channel is scrambled by the AQPSK modulation technology, and the interference signal may be added to the downlink signal of the voice traffic channel by using an AQPSK modulation technology defined by the VAMOS standard, for example:
  • the downlink signal (voice service) is used as the I path, and the added interference signal is used as the Q path;
  • the training sequence of the interference signal can be configured, for example, the configuration principle can be: the training sequence of the configuration of the dry 4 special signal is the same as the training sequence of the downlink signal And orthogonal; the non-training sequence part of the interference signal is filled with a Dummy burst or a random number defined by the GSM standard, and the signal strength of the interference signal is greater than or equal to the signal strength of the downlink signal.
  • the signal strength of the interference signal can be configured by adjusting the value of the AQPSK modulated I channel signal.
  • the positive value of ⁇ indicates that the signal strength of the I channel is stronger than the Q channel by a dB
  • the negative value of a signal indicates that the signal strength of the I channel is weaker than the Q channel by a dB. . Therefore, as long as the a value of the downlink I channel signal where the voice service is configured is less than or equal to 0, the interference signal strength may be greater than or equal to the voice service signal.
  • the embodiment may configure the ⁇ value of the downlink signal to be less than or Equal to 0, that is, the signal strength of the configured interference signal is greater than or equal to the normal downlink signal; further, in order not to significantly affect the voice quality corresponding to the downlink signal, the alpha value of the downlink signal may not be configured too small, for example: 4 ⁇ c 0.
  • Step 303 The BTS performs frequency offset detection on the uplink signal on the scrambled voice traffic channel, and obtains a frequency offset detection result of the uplink signal of the voice traffic channel to be detected.
  • the BTS After the downlink signal is scrambled in step 302, the BTS performs frequency offset detection on the uplink signal on the scrambled voice traffic channel.
  • the BTS may first obtain the detection parameter of the frequency offset detection, where the detection parameter may be in the pre-configured BTS, or may be sent by the BSC to the BTS.
  • the BTS can obtain the detection parameters in the following two ways: One is that the BSC sends the detection parameter to the BTS, for example, the detection parameter may be included in the first signaling sent by the BSC; and the other is, the BTS is pre- The detection parameters corresponding to the respective voice traffic channels are stored.
  • the detection parameter can be obtained by direct query.
  • This step can specifically include the following two methods:
  • the BTS obtains a detection parameter; the detection parameter includes a detection period, and the detection period represents an interval time during which the frequency offset detection is performed.
  • Step a2 BTS passes the uplink automatic frequency correction according to the detection period (Automatic
  • AFC Frequency Correction
  • the BTS obtains multiple frequency offset values of the uplink signal, and the time interval between any two consecutive frequency offset values is one detection period.
  • the BTS sends the frequency offset value of the uplink signal acquired in this step to the BSC, that is, after the step, step 304 is performed; when the frequency offset detection result is not When the frequency offset value of the uplink signal is used, step a 3 is performed after this step.
  • Step a3 The BTS obtains a first frequency offset change value in each detection period according to each frequency offset value of the detected uplink signal.
  • the first frequency offset change value in each detection period is equal to the difference between the frequency offset value corresponding to the end time of one detection period and the frequency offset value corresponding to the start time of the detection period; that is, one detection period
  • the frequency offset change value is equal to: the difference between the frequency offset value of the air interface frame corresponding to the end time of the detection period and the frequency offset value of the air interface frame corresponding to the start time.
  • the end time of one detection cycle is the start time of the next detection cycle.
  • the BTS obtains multiple frequency offset values fl, f2, f3 fn .
  • the frequency offset value corresponding to the start time; ⁇ may be the frequency offset value corresponding to the end time of the second detection period, and ⁇ may also be the frequency offset value corresponding to the start time of the third detection period;
  • fn may be a frequency offset value corresponding to an end time of the n-1th detection period, and fn may also be a frequency offset value corresponding to a start time of the nth detection period.
  • the first frequency offset change value in each detection period may be, for example, f2-fl, ⁇ - ⁇ 2 fn-f(n-l).
  • the BTS sends the first frequency offset change value obtained in this step to the BSC, that is, after step S450, step 304 is performed; when the frequency offset detection result is not When the frequency offset value or the first frequency offset change value of the uplink signal is used, step a4 is performed after this step.
  • Step a4 the BTS determines the terminal to be detected according to the first frequency offset change value and the threshold value. Whether the frequency offset is abnormal.
  • the threshold value may be stored in the BTS in advance, or may be sent by the BSC to the BTS.
  • the BTS compares the first frequency offset change value with the threshold value, and if the N first frequency offset change values are greater than or equal to the threshold value, determining that the frequency offset of the terminal to be detected is abnormal, otherwise, determining that the frequency offset is to be detected
  • the frequency offset of the terminal is normal; where N is greater than or equal to 1.
  • the detection duration is also considered.
  • the test duration is included in the test parameters and is one of the test parameters.
  • the detection duration indicates the total length of time during which the detection is performed. When no abnormality in the frequency offset is detected within the total length of time, the frequency offset is considered normal.
  • the specific step a4 may include: if there is N frequency offset change values greater than or equal to the threshold value within a predetermined detection duration, determining that the frequency offset of the GSM terminal to be detected is abnormal, otherwise, determining that the frequency offset is to be detected The frequency offset of the GSM terminal is normal; N > 1 , where the specific value of N can be set according to the specific situation.
  • step a result is obtained whether the frequency offset of the terminal to be detected is abnormal.
  • the frequency offset detection result is whether the frequency offset of the terminal to be detected is abnormal; and then step 304 is performed.
  • Step al the BTS obtains the detection parameter; the detection parameter includes a time interval.
  • Step a2 the BTS detects the frequency offset value of each air interface frame of the uplink signal by using the uplink AFC.
  • the BTS detects the frequency offset value of each air interface frame of the uplink signal.
  • the BTS sends the frequency offset value of the air interface frame acquired in this step to the BSC, that is, after the step, step 304 is performed; when the frequency offset detection result is not When the frequency offset value of the air interface frame is used, step a3' is performed after this step.
  • the BTS obtains a second frequency offset change value between any two air interface frames of the interval time interval according to the frequency offset value of each air interface frame.
  • the second frequency offset change value is a difference between two frequency offset values corresponding to the two air interface frames of the interval time interval.
  • the BTS obtains the frequency offset values f 1 , f, 2, and f3 fn of each air interface frame.
  • the preset time interval is t, wherein the number of air interface frames separated by two air interface frames separated by time interval t is k, and thus, the second frequency offset change value between any two air interface frames of the interval time interval t
  • it may be: f(k+l)-f, l, f(k+2)-f'2 f (k+n)-fn.
  • the BTS sends the second frequency offset change value obtained in this step to the BSC, that is, after the step, step 304 is performed; when the frequency offset detection result is not When the frequency offset value or the second frequency offset change value of the air interface frame, step a4' is performed after this step.
  • Step a4 the BTS determines whether the frequency offset of the terminal to be detected is abnormal according to the second frequency offset change value and the threshold value.
  • the threshold may be pre-stored in the BTS or sent to the BTS by the BSC.
  • the BTS compares the second frequency offset change value with the threshold value, and if the N second frequency offset change values are greater than or equal to the threshold value within a preset detection duration, determining the frequency of the terminal to be detected
  • the offset is abnormal, and N is greater than or equal to 1.
  • the frequency offset detection result is whether an abnormality occurs in the frequency offset of the terminal to be detected; then step 304 is performed.
  • a frequency offset change value can be obtained every time a detection cycle is passed, and when the detection and determination method in the second mode is used, only the first detection cycle is passed. After that, a frequency offset change value can be obtained every time an air interface frame is passed, so that the frequency offset result can be detected more quickly.
  • Step 304 The BTS sends the frequency offset detection result to the BSC.
  • the BTS may send the signaling including the frequency offset detection result to the BSC through the Abis interface.
  • Step 305 The BSC receives the frequency offset detection result sent by the BTS.
  • the frequency offset detection result received by the BSC may be any one of the following parameters: a frequency offset value of the uplink signal, a first frequency offset change value, and a frequency of the air interface frame of the uplink signal. Whether the offset value, the second frequency offset change value, and the frequency offset of the terminal to be detected are abnormal.
  • Step 306 The BSC learns whether the frequency offset of the terminal to be detected is abnormal according to the frequency offset detection result.
  • the specific process of step 306 may include: the BSC acquires the first frequency offset change in each detection period according to the frequency offset value of the detected uplink signal. And determining, according to the first frequency offset change value and the preset threshold value, whether an abnormality occurs in the frequency offset of the terminal to be detected.
  • the specific processing of this step can be referred to the description in step a3 and step a4. The difference between this step and step a3 and step a4 is that the execution subject is different.
  • the specific process of step 306 may include: determining, by the BSC, whether the frequency offset of the to-be-detected terminal occurs according to the first frequency offset change value and the preset threshold value abnormal.
  • the specific processing of this step refer to the description in step a4. The difference between this step and step a4 is that the execution subject is different.
  • the specific process of step 306 may include: the BSC obtains the interval between any two air interface frames of the interval time interval according to the frequency offset value of the air interface frame. And determining, by the second frequency offset change value and the preset threshold value, whether the frequency offset of the terminal to be detected is abnormal.
  • the specific processing of this step refer to the description in step a3 and step a4. The difference between this step and step a3, and step a4 is that the execution subject is different.
  • the specific process of step 306 may include: determining, by the BSC, whether the frequency offset of the to-be-detected terminal occurs according to the second frequency offset change value and the preset threshold value abnormal.
  • the specific processing procedure of this step refer to the description in step a4. The difference between this step and step a 4 is that the execution subject is different.
  • the BSC directly knows the final inspection result.
  • Step 307 The BSC adds the abnormality of the frequency offset of the terminal to be detected and the device type identifier of the terminal to be detected to the frequency offset detection database.
  • the BSC adds the received detection result of whether the frequency offset of the terminal to be detected is abnormal to the frequency offset detection database together with the device type identifier of the corresponding GSM terminal to update the database.
  • the device type identifier can be TAC, and the database uses the TAC of the terminal as an index.
  • the frequency offset detection database may be queried before the frequency offset detection of a GSM terminal, that is, before step 301, the following steps may be included:
  • Step 300 The BSC queries, in the frequency offset detection database, whether the frequency offset corresponding to the terminal to be detected is abnormal, according to the device type identifier of the terminal to be detected. If the detection result corresponding to the terminal to be detected is not queried, Go to step 301.
  • the subsequent step may be directly performed according to the detection result, and the BTS is not required to be instructed to detect the terminal to be detected.
  • the following steps are as follows: When the detection result is abnormal for the frequency offset, special measures are taken on the terminal to ensure that the terminal participates in the voice quality after VAMOS multiplexing; when the detection result is a frequency offset If it is normal, the terminal can be directly used to participate in VAMOS multiplexing.
  • the base station controller may send the detection indication signaling to the base transceiver station to instruct the base transceiver station to send the downlink information of the to-be-detected voice service channel indicated in the detection indication signaling.
  • the number is scrambled, and then the base station transceiver station performs frequency offset detection on the uplink signal of the scrambled voice traffic channel to be detected, so that when the downlink signal of the to-be-detected voice traffic channel is multiplexed, the voice service to be detected is used.
  • the frequency offset detection result of the uplink signal of the channel, and the base station controller receives the frequency offset detection result sent by the base transceiver station to learn whether an abnormality occurs in the frequency offset when the terminal to be detected participates in the VAMOS technology.
  • the method provided by the embodiment of the present invention can quickly and accurately identify a terminal that may be abnormal during VAMOS multiplexing, and at the same time has less impact on the normal voice service quality of the terminal.
  • the foregoing storage medium includes: a medium that can store program codes, such as a ROM, a RAM, a magnetic disk, or an optical disk.
  • FIG. 4 is a schematic diagram of a base transceiver station according to an embodiment of the present invention.
  • the base transceiver station includes: a scrambling module 41, a detecting module 43, and a first sending module 45.
  • the scrambling module 41 is configured to scramble the downlink signal of the to-be-detected voice traffic channel corresponding to the detection terminal by the adaptive quadrature phase shift keying modulation technique.
  • the detecting module 43 is configured to perform frequency offset detection on the uplink signal on the to-be-detected voice traffic channel scrambled by the scrambling module 41, and obtain a frequency offset detection result of the uplink signal of the voice traffic channel to be detected.
  • the first sending module 45 is configured to send the frequency offset detection result obtained by the detecting module 43 to the base station controller.
  • the scrambling module scrambles the downlink signal of the to-be-detected voice traffic channel corresponding to the detecting terminal, and then the detecting module performs frequency offset detection on the uplink signal on the scrambled voice traffic channel to be detected, thereby Obtaining a downlink message of the voice traffic channel to be detected
  • the frequency offset detection result of the uplink signal of the to-be-detected voice traffic channel is sent by the first sending module to the base station controller, so that the base station controller knows that the terminal to be detected is participating Whether the frequency offset will be abnormal when using VAMOS technology.
  • FIG. 5 is a schematic diagram of a base transceiver station according to another embodiment of the present invention. As shown in FIG. 5, on the basis of the embodiment shown in FIG. 4, the method further includes: a first receiving module 47.
  • the first receiving module 47 is configured to receive first signaling sent by the base station controller, where the first signaling includes a cell for indicating frequency offset detection of the voice traffic channel to be detected.
  • the scrambling module 41 can be specifically configured to: add an interference signal to the downlink signal of the voice traffic channel to be detected by the adaptive quadrature phase shift keying modulation technology; the training sequence of the interference signal and the training sequence of the downlink signal are similar and orthogonal, and the interference The non-training sequence of the signal is partially filled with a virtual frame or a random number, and the signal strength of the interference signal is greater than or equal to the signal strength of the downlink signal.
  • the detecting module 43 may be specifically configured to: periodically detect the frequency offset value of the uplink signal by using the uplink automatic frequency correction; The first detecting unit 431.
  • the detecting module 43 includes: a first detecting unit 431 and a first acquiring unit 433.
  • the detecting module 43 includes: a first detecting unit 431, a first acquiring unit 433, and a first determining unit 435.
  • the first detecting unit 431 is configured to periodically detect the frequency offset value of the uplink signal by the uplink automatic frequency correction.
  • the first obtaining unit 433 is configured to acquire, according to the frequency offset value of the uplink signal detected by the first detecting unit 431, a first frequency offset change value in each detection period; a first frequency offset in each detection period.
  • the change value is equal to the difference between the frequency offset value corresponding to the end time of one detection period and the frequency offset value corresponding to the start time of the detection period.
  • the first determining unit 435 is configured to determine whether an abnormality occurs in the frequency offset of the terminal to be detected according to the first frequency offset change value acquired by the first acquiring unit 433 and the preset threshold value.
  • the first determining unit 435 is specifically configured to: if the preset detection duration is reached When the N first frequency offset change values are greater than or equal to the threshold value, it is determined that the frequency offset of the terminal to be detected is abnormal, and N is greater than or equal to 1.
  • the detecting module 43 is specifically configured to: detect the frequency offset value of the air interface frame of the uplink signal by using the uplink automatic frequency correction; Two detecting unit 430.
  • the detecting module 43 includes: a second detecting unit 430 and a second acquiring unit 432.
  • the detecting module 43 includes: a second detecting unit 430, a second obtaining unit 432, and a second determining unit 434.
  • the second detecting unit 430 is configured to detect a frequency offset value of the air interface frame of the uplink signal by using the uplink automatic frequency correction.
  • the second obtaining unit 432 is configured to obtain, according to the frequency offset value of the air interface frame detected by the second detecting unit, the second frequency offset change value between any two air interface frames of the interval time interval; the second frequency offset change The value is the difference between the two frequency offset values corresponding to the two air interface frames of the interval time interval.
  • the second determining unit 434 is configured to determine whether an abnormality occurs in the frequency offset of the terminal to be detected according to the second frequency offset change value acquired by the second obtaining unit 432 and the preset threshold value.
  • the second determining unit 434 may be specifically configured to: if the N second frequency offset change values are greater than or equal to the threshold value within a preset detection duration, determine that the frequency offset of the terminal to be detected is abnormal. , N is greater than or equal to 1.
  • the base transceiver station scrambles the downlink signal of the voice traffic channel to be detected, and then performs frequency offset detection on the uplink signal of the scrambled voice traffic channel to be detected, thereby obtaining the voice traffic channel to be detected.
  • the frequency offset detection result of the uplink signal of the to-be-detected voice traffic channel is sent to the base station controller, so that the base station controller knows that the base station controller corresponds to the to-be-detected voice traffic channel.
  • Detection terminal is participating Whether the frequency offset will be abnormal when using VAMOS technology.
  • the method provided by the embodiment of the present invention can quickly and accurately identify a terminal that may be abnormal during VAMOS multiplexing, and at the same time has less impact on the normal voice service quality of the terminal.
  • FIG. 6 is a schematic diagram of a base station controller according to an embodiment of the present invention. As shown in FIG. 6, the base station controller includes: a second receiving module 61 and an obtaining module 63.
  • the second receiving module 61 is configured to receive a frequency offset detection result that is sent by the base transceiver station and that is performed by the base transceiver station to perform frequency offset detection on the uplink signal on the to-be-detected voice service channel after the scrambling, and the voice service channel to be detected is a voice service channel corresponding to the terminal to be detected;
  • the obtaining module 63 is configured to learn, according to the frequency offset detection result, whether an abnormality occurs in the frequency offset of the terminal to be detected.
  • the second receiving module receives the frequency offset detection flag sent by the base transceiver station, and the frequency offset detection result is that the base transceiver station performs frequency offset on the uplink signal on the scrambled voice traffic channel after the scrambling According to the frequency offset detection result, the acquisition module learns whether the frequency offset of the to-be-detected terminal corresponding to the to-be-detected voice traffic channel is abnormal when participating in the VAMOS technology.
  • FIG. 7 is a schematic diagram of a base station controller according to another embodiment of the present invention. As shown in FIG. 7, on the basis of the embodiment shown in FIG. 6, the base station controller further includes: a second sending module 65 and an adding module 67. .
  • the second sending module 65 is configured to send the first signaling to the base transceiver station; the first signaling includes a cell for instructing the base transceiver station to perform frequency offset detection on the voice traffic channel to be detected.
  • the adding module 67 is configured to add a result of whether the frequency offset of the terminal to be detected is abnormal and the device type identifier of the terminal to be detected to the frequency offset detecting database.
  • the obtaining module 63 includes: a third obtaining unit 631 and a third determining unit 633.
  • the obtaining module 63 includes a third determining unit 633.
  • the first frequency offset change value is equal to a difference between the frequency offset value corresponding to the end time of one detection period and the frequency offset value corresponding to the start time of the detection period,
  • the third obtaining unit 631 is configured to acquire, according to the frequency offset value of the detected uplink signal, a first frequency offset change value in each detection period; the first frequency offset change value in each detection period is equal to one detection. The difference between the frequency offset value corresponding to the end time of the cycle and the frequency offset value corresponding to the start time of the detection cycle.
  • the third determining unit 633 is configured to determine whether the frequency offset of the terminal to be detected is abnormal according to the first frequency offset change value and the preset threshold value.
  • the third determining unit 633 is specifically configured to: if the N frequency offset change values are greater than or equal to the threshold value within a preset detection duration, determine that the frequency offset of the terminal to be detected is abnormal, and N is greater than Or equal to 1.
  • the obtaining module 63 includes: a fourth obtaining unit 630 and a fourth determining unit 632.
  • the obtaining module 63 includes: a fourth determining unit 632.
  • the second frequency offset change value is the difference between the two frequency offset values corresponding to the two air interface frames of the interval time interval.
  • the fourth obtaining unit 630 is configured to obtain, according to the frequency offset value of the air interface frame, a second frequency offset change value between any two air interface frames of the interval time interval; the second frequency offset change value is two intervals of the interval time interval. The difference between the two frequency offset values corresponding to the air interface frames.
  • the fourth determining unit 632 is configured to determine whether an abnormality occurs in the frequency offset of the terminal to be detected according to the second frequency offset change value and the preset threshold value.
  • the fourth determining unit 632 is specifically configured to: if the N frequency offset change values are greater than or equal to the threshold value within a preset detection duration, determine that the frequency offset of the terminal to be detected is abnormal, and N is greater than Or equal to 1.
  • the base station controller may send the detection indication signaling to the base transceiver station to instruct the base transceiver station to scramble the downlink signal of the to-be-detected voice traffic channel indicated in the detection indication signaling, and then the base transceiver station Performing frequency offset detection on the uplink signal of the to-be-detected voice traffic channel after scrambling, so that when the downlink signal of the to-be-detected voice traffic channel is multiplexed, the frequency offset detection result of the uplink signal of the to-be-detected voice traffic channel is obtained.
  • the base station controller receives the frequency offset detection result sent by the base transceiver station to learn whether an abnormality occurs in the frequency offset when the terminal to be detected participates in the VAMOS technology.
  • the method provided by the embodiment of the present invention can quickly and accurately identify a terminal that may be abnormal during VAMOS multiplexing, and at the same time has less impact on the normal voice service quality of the terminal.
  • the embodiment of the present invention further provides a terminal frequency offset detection system, which includes any base transceiver station provided by the embodiment of the present invention and any base station controller provided by the embodiment of the present invention.

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Description

终端频率偏移检测方法、 装置及系统 本申请要求于 2010 年 11 月 01 日提交中国专利局、 申请号为 201010532088.3、 发明名称为"终端频率偏移检测方法、 装置及系统"的中国 专利申请的优先权, 其全部内容通过引用结合在本申请中。 技术领域 本发明涉及无线通讯技术领域, 具体涉及一种终端频率偏移检测方法、 装置及系统。
背景技术 VAMOS ( Voice services over Adaptive Multi-user Channels on One Slot, 单时隙自适应多信道语音)技术是一种提高语音业务容量的全球移动蜂窝 通信( Global System for Mobile Communications , 以下简称为: GSM )标准 技术。 VAMOS技术可以在一条半速率或全速率无线信道上复用两个语音用 户对应的语音业务。
在现有的 GSM终端进行语音业务时, VAMOS技术可以将同一个小区 的两个 GSM终端的语音业务复用到同一业务信道上, 由此来提高 GSM容 量。
而当 GSM终端在接收通过 VAMOS 下行 AQPSK调制技术复用后的语 音业务信号时, 该 GSM终端的语音业务信号受到复用的另一个 GSM终端 语音业务信号干扰。 特别当干扰信号比有效语音业务信号强时, 某类 GSM 终端的下行自动频率校正 ( Automatic Frequency Correction , 以下简称为: AFC ) 功能可能出现异常, 导致下行频率偏移异常, 进而导致语音质量变 差或掉线的问题。 但是, 现有技术中缺乏检测在进行 VAMOS 复用时, 会 出现频率偏移异常的终端的手段。 发明内容 本发明实施例提供了一种终端频率偏移检测方法、 装置及系统, 以检 测出终端在进行 VAMOS复用时, 是否会出现频率偏移异常。
本发明实施例具体可以通过如下技术方案实现:
一方面, 提供了一种终端频率偏移检测方法, 该方法包括:
通过自适应正交相移键控调制技术对待检测终端对应的待检测语音业 务信道的下行信号进行加扰;
对加扰后的所述待检测语音业务信道上的上行信号进行频率偏移检 测, 得到所述待检测语音业务信道的上行信号的频率偏移检测结果;
将所述频率偏移检测结果发送给基站控制器。
还提供了一种基站收发台, 包括:
加扰模块, 用于通过自适应正交相移键控调制技术对待检测终端对应 的待检测语音业务信道的下行信号进行加扰;
检测模块, 用于对所述加扰模块加扰后的所述待检测语音业务信道上 的上行信号进行频率偏移检测, 得到所述待检测语音业务信道的上行信号 的频率偏移检测结果;
第一发送模块, 用于将所述检测模块得到的所述频率偏移检测结果发 送给基站控制器。
另一方面, 还提供了一种终端频率偏移检测方法, 该方法包括: 接收基站收发台发送的、 所述基站收发台对加扰后的待检测语音业务 信道上的上行信号进行频率偏移检测得到的频率偏移检测结杲, 所述待检 测语音业务信道为待检测终端对应的语音业务信道;
根据所述频率偏移检测结果获知所述待检测终端的频率偏移是否发生 异常。
还提供了一种基站控制器, 包括:
第二接收模块, 用于接收基站收发台发送的、 所述基站收发台对加扰 后的待检测语音业务信道上的上行信号进行频率偏移检测得到的频率偏移 检测结果, 所述待检测语音业务信道为待检测终端对应的语音业务信道; 获取模块, 用于根据所述频率偏移检测结果获知所述待检测终端的频 率偏移是否发生异常。
还提供一种终端频率偏移检测系统, 包括本发明实施例提供的任一基 站收发台和本发明实施例提供的任一基站控制器。
本发明实施例的终端频率偏移检测方法、 装置及系统, 基站收发台对 待检测终端对应的待检测语音业务信道的下行信号进行加扰, 然后对加扰 后的待检测语音业务信道上的上行信号进行频率偏移检测, 从而可以得到 该待检测语音业务信道的下行信号被复用时, 该待检测语音业务信道的上 行信号的频率偏移检测结果, 并将该检测结果发送给基站控制器, 使得基 站控制器获知与该待检测终端在参与 VAMOS技术时频率偏移是否会发生 异常。 附图说明 图 1为本发明一实施例提供的终端频率偏移检测方法的流程图; 图 2为本发明又一实施例提供的终端频率偏移检测方法的流程图; 图 3为本发明再一实施例提供的终端频率偏移检测方法的流程图; 图 4为本发明一实施例提供的基站收发台的示意图;
图 5为本发明又一实施例提供的基站收发台的示意图;
图 6为本发明一实施例提供的基站控制器的示意图;
图 7为本发明又一实施例提供的基站控制器的示意图。
具体实施方式 为使本发明的目的、 技术方案、 及优点更加清楚明白, 下面结合附图 并举实施例 , 对本发明提供的技术方案进一步详细描述。
图 1为本发明一实施例提供的终端频率偏移检测方法的流程图,如图 1 所示, 该方法包括:
步骤 101、通过自适应正交相移键控调制技术对待检测终端对应的待检 测语音业务信道的下行信号进行加扰。
本发明实施例可以应用在 GSM系统中, 其中, 本实施例中的待检测终 端可以为支持 GSM制式的终端, 以下以 GSM终端为例进行说明。 GSM系 统中, VAMOS技术可以支持现有的 GSM终端参与, 而 GSM终端在接收 到使用 VAMOS技术复用的语音业务时, 可能会发生频率偏移异常, 由此 会影响语音质量。 为了保证在 VAMOS技术中的语音质量, 可以提前识别 出可能会出现异常的 GSM终端, 以便对这些 GSM终端采取保护措施, 当 对这些 GSM终端采取保护措施后, 就可以使得这些 GSM终端在 VAMOS 技术中不出现异常或者进行少出现异常, 从而保证语音质量。
当一 GSM终端在进行正常的语音业务通话时, 可以对该 GSM终端进 行检测, 该 GSM终端即为待检测终端, 该 GSM终端对应的语音业务通道 即为待检测语音业务通道。 基站子系统( Base Station System, 以下简称为: BSS )可以对任一正在进行语音业务通话的 GSM终端进行检测, BSS可以 根据需要确定出待检测终端。 其中 BSS 包括基站控制器 (Base Station Controller, 以下简称为: BSC )和基站收发台 ( ( Base Transceiver Station, 以下简称为: BTS ) 。
确定待检测终端后, BSS 获取待检测终端的设备类型标识和该待检测 终端对应的语音业务信道的信道标识。 其中, 终端的设备类型标识用于标 识每个终端的类型, 该设备类型标识可以为国际移动设备身份码 ( International Mobile Equipment Identity, 简称为: IMEI ) 中的类型分配码 ( Type Allocation Code, 简称为: TAC )。 每一种类型的终端的 TAC相同。
进一步地, 可以认为同一类型的 GSM终端的特性相同, 本发明实施例 中, 当识别出某一 GSM终端是否会出现异常时, 也就可以获知与该 GSM 终端相同类型的 GSM终端是否会出现异常。
语音业务信道的信道标识可以为业务信道号, 该业务信道号用于唯一 标识一个语音业务信道。
在 BSS确定对某个正在进行正常语音业务的 GSM终端进行检测时, 可以由 BTS确定, 也可以由 BSC确定。 当由 BTS确定后, BTS直接通过 自适应正交相移键控 ( Adaptive Quadrature Phase Shift Keying, 以下简称为: AQPSK )调制技术对待检测语音业务信道的下行信号进行加扰。 当由 BSC 确定后, BSC向 BTS发送检测指示信令, 以指示 BTS对该待检测语音业务 信道进行加扰, 其中, 加扰的方式可以通过 AQPSK调制技术来进行。
步骤 102、对加扰后的待检测语音业务信道上的上行信号进行频率偏移 检测, 得到待检测语音业务信道的上行信号的频率偏移检测结果。
BTS 对加扰后的该语音业务信道上的上行信号进行频率偏移检测。 由 此 BTS可以得到在待检测的语音业务信道的下行信号被加扰后, 该语音业 务信道的上行信号的频率偏移检测结果。
其中, 该频率偏移检测结果可以为该上行信号的频率偏移值或频率偏 移变化值, 或者该频率偏移检测结果可以为该待检测终端的频率偏移是否 发生异常的检测结果。
步骤 103、 将频率偏移检测结果发送给基站控制器。
BTS可以通过检测结果信令, 将上述频率偏移检测结果发送给 BSC。 该检测结果中还可以包括待检测语音业务信道的标识信息。
当该频率偏移检测结果为该上行信号的频率偏移值或频率偏移变化 值, BSC 可以根据频率偏移值或频率偏移变化值计算出频率偏移是否发生 异常的结果; 当该频率偏移检测结果为频率偏移是否发生异常的结果时, BSC 就可以无需计算而直接获取到频率偏移是否发生异常的结果。 然后, BSC 根据频率偏移是否发生异常的结果, 以及根据该语音业务信道的标识 信息, 就可以获知该终端以及与该终端同类型的终端在参与 VAMOS技术 时, 频率偏移是否会发生异常。
在检测出某一类型的 GSM终端在参与 VAMOS技术时会发生异常后, 可以在该类型的 GSM终端实际参与 VAMOS技术时, 对该 GSM终端采取 保护措施。
本实施例可以在 GSM终端进行正常的语音业务时, 对该 GSM终端进 行检测, 而不影响该 GSM终端的正常语音业务。
本发明实施例, 基站收发台对待检测终端对应的待检测语音业务信道 的下行信号进行加扰, 然后对加扰后的待检测语音业务信道上的上行信号 进行频率偏移检测, 从而可以得到该待检测语音业务信道的下行信号被复 用时, 该待检测语音业务信道的上行信号的频率偏移检测结杲, 并将该检 测结果发送给基站控制器, 使得基站控制器获知与该待检测终端在参与 VAMOS技术时频率偏移是否会发生异常。
图 2 为本发明又一实施例提供的终端频率偏移检测方法的流程图, 如 图 2所示, 该方法包括:
步骤 201、接收基站收发台发送的、基站收发台对加扰后的待检测语音 业务信道上的上行信号进行频率偏移检测得到的频率偏移检测结果; 该待 检测语音业务信道为待检测终端对应的语音业务信道。
BTS 对待检测语音业务信息进行加扰, 并对加扰后的的待检测语音业 务信道上的上行信号进行频率偏移检测,获得频率偏移检测结果,然后 BTS 将该频率偏移检测结果发送给 BSC。
步骤 202、根据频率偏移检测结果获知待检测终端的频率偏移是否发生 异常。
当该频率偏移检测结果为该上行信号的频率偏移值或频率偏移变化 值, BSC 可以根据频率偏移值或频率偏移变化值计算出频率偏移是否发生 异常的结果; 当该频率偏移检测结果为频率偏移是否发生异常的结果时, BSC 就可以无需计算而直接获取到频率偏移是否发生异常的结果。 由此,
BSC就获知到该终端以及与该终端同类型的终端在参与 VAMOS技术时, 频率偏移是否会发生异常。
在 BSC获知到该终端的频率偏移是否会发生异常的检测结杲后, 可以 将该检测结果和与该检测结果对应的终端的设备类型标识一起添加到频率 偏移检测数据库。 也就是说, 在频率偏移检测数据库中, 可以存储有检测 过的每一类型的 GSM终端的检测结果; 该检测结果表示某一类型 GSM终 端在参与 VAMOS技术时, 频率偏移是否会发生异常; 其中 GSM终端的类 型由可以设备类型标识来确定,该设备类型标识例如为 IMEI标识中的 TAC 码。 频率偏移检测数据库可以按照 TAC进行索引。
在频率偏移检测数据库建立后, 当根据需要要对某一终端进行检测时, 可以先由 BSC在该频率偏移数据库中查询是否存储在该类型终端的检测结 果, 当未查询到该类型终端的检查结果时, 再执行步骤 201和步骤 202。
本发明实施例, 基站控制器接收基站收发台发送的频率偏移检测结果, 该频率偏移检测结果是由基站收发台对加扰后的待检测语音业务信道上的 上行信号进行频率偏移检测得到的, 然后基站控制器根据该频率偏移检测 结果获知与该待检测语音业务信道对应的待检测终端在参与 VAMOS技术 时频率偏移是否会发生异常。
图 3 为本发明再一实施例提供的终端频率偏移检测方法的流程图, 如 图 3所示, 该方法包括:
步骤 301、 BSC向 BTS发送第一信令; 该第一信令包括用于指示对待 检测语音业务信道进行频率偏移检测的信元。 其中, 该第一信令中还可以 包括待检测语音业务信道的信道标识。
本实施例中, 待检测终端例如可以为 GSM终端, 待检测语音业务信道 例如可以为该 GSM终端对应的语音业务信道。
当 BSC确定要对正在进行正常的语音业务的一 GSM终端进行频率偏 移检测时, BSC获取该 GSM终端对应的语音业务信道的信道标识, 该信道 标识例如为业务信道号。 然后 BSC可以通过 Abis接口向 BTS发送包含上 述信道标识的检测指示信令, 用于指示 BTS对该信道标识对应的语音业务 信道进行频率偏移检测。 其中, Abis接口为 BSC和 BTS之间的通信接口。
需要说明的是, 若是由 BTS确定要对某一 GSM终端进行频率偏移检 测, 则 BTS可以直接对该 GSM终端对应的语音业务信道进行频率偏移检 测, 而无需接收 BSC的指示。
步骤 302、 BTS通过 AQPSK调制技术对待检测终端对应的待检测语音 业务信道的下行信号进行加扰。
BTS接收到 BSC发送的检测指示信令后或者 BTS直接触发对某一终端 进行频率偏移检测后, BTS 对该终端对应的语音业务信道的下行信号进行 加扰, 加扰的方式可以采用 AQPSK调制技术, 以模拟出该语音业务信道对 应的 GSM终端在参与 VAMOS技术时的情况, 从而对该 GSM终端发送的 上行信号进行频率偏移检测。
具体的,通过 AQPSK调制技术对该语音业务信道的下行信号进行加扰 可以为: 通过 VAMOS标准定义的 AQPSK调制技术,对该语音业务信道的 下行信号增加干扰信号, 例如: 将该语音业务信道中的下行信号 (语音业 务)作为 I路, 将增加的干扰信号作为 Q路; 干扰信号的训练序列可配置, 例如配置的原则可以为: 配置干 4尤信号的训练序列与下行信号的训练序列 同类且正交; 千扰信号的非训练序列部分填充 GSM 标准定义的虚帧 ( Dummy burst )或随机数, 且干扰信号的信号强度大于或等于下行信号的 信号强度。 其中, 可以通过调整 AQPSK调制 I路信号 α值来配置千扰信号 的信号强度, α正值表示 I路信号强度比 Q路强 a dB, a负值表示 I路信号 强度比 Q路弱 a dB。 由此只要配置语音业务所在下行 I路信号的 a值小于 或等于 0, 就可使得干扰信号强度大于等于语音业务信号。
需要说明的是, 在 VAMOS技术中, 将 I路和 Q路两路信号进行复用 后, 信号强度弱的一路信号对应的终端容易发生频率偏移异常; 由此为了 使得有可能出现的频率偏移异常尽快出现, 以便提高检测效率, 本实施例 可以配置下行信号的 α值小于或等于 0,也就是配置干扰信号的信号强度大 于或等于正常的下行信号; 进一步地, 为了不明显影响与下行信号对应的 语音质量, 可以不要将下行信号的 α值配置得太小, 例如: _ 4 < c 0。
步骤 303、BTS对加扰后的待检测语音业务信道上的上行信号进行频率 偏移检测, 得到待检测语音业务信道的上行信号的频率偏移检测结果。
在步骤 302中对下行信号进行加扰后, BTS对加扰后的语音业务信道 上的上行信号进行频率偏移检测。 其中, 在进行频率偏移检测之前, BTS 可以先获取频率偏移检测的检测参数, 该检测参数可以是预先配置的 BTS 中的, 也可以是 BSC发送给 BTS的。 具体的, BTS可以通过以下两种方式 获取检测参数: 一种为, BSC向 BTS发送该检测参数, 例如该检测参数可 以包含在 BSC发送的第一信令中; 另一种为, BTS上预先存储有与各个语 音业务信道对应的检测参数, 当 BTS对某个语音业务信道进行频率偏移检 测时, 直接查询就能获得该检测参数。
本步 具体可以包括以下两种方式:
第一种方式:
步骤 al、 BTS获取检测参数; 该检测参数包括检测周期, 该检测周期 表示周期进行频率偏移检测的间隔时间。
步骤 a2、 BTS 根据检测周期, 通过上行自动频率校正 (Automatic
Frequency Correction , 以下简称为: AFC )周期性地检测上行信号的频率偏 移值。 其中, 由于 GSM终端是通过跟踪网络下行信号频率偏移来保持和网 络同步的, 即先通过下行 AFC估计接收到下行信号相对本地时钟的频率偏 移, 然后通过调整本地时钟频率相应改变上行信号的发送频率。 如果终端 下行频率偏移出现异常, 这个异常会直接反映到终端上行信号发送频率上, 这样通过基站的上行 AFC检测上行信号的频率偏移,等效于待检测的 GSM 终端估计的下行异常频率偏移。
BTS 获取上行信号的多个频率偏移值, 其中任两个连续的频率偏移值 之间的时间间隔即为一个检测周期。
当频率偏移检测结果为上行信号的频率偏移值时, BTS 就将本步骤获 取的上行信号的频率偏移值发送给 BSC , 即本步骤之后就执行步骤 304; 当 频率偏移检测结果不是上行信号的频率偏移值时,本步骤之后执行步骤 a3。
步骤 a3、 BTS根据检测到的上行信号的每个频率偏移值, 获得每个检 测周期内的第一频率偏移变化值。 每个检测周期内的第一频率偏移变化值 等于一个检测周期的结束时刻对应的频率偏移值与该检测周期的开始时刻 对应的频率偏移值的差值; 也就是说, 一个检测周期通常包括多个空口帧, 频率偏移变化值等于: 该检测周期的结束时刻对应的空口帧的频率偏移值 与开始时刻对应的空口帧的频率偏移值之间的差值。 其中, 一个检测周期 的结束时刻, 即为下一个检测周期的开始时刻。 BTS 获取到多个频率偏移 值 fl、 f2、 f3 fn 。 其中, fl可以为第一个检测周期的开始时 间对应的频率偏移值; f2 可以为第一个检测周期的结束时间对应的频率偏 移值,并且 f2也同时可以为第二个检测周期的开始时间对应的频率偏移值; β可以为第二个检测周期的结束时间对应的频率偏移值, 并且 Ω也同时可 以为第三个检测周期的开始时间对应的频率偏移值; 依次类推, fn 可以为 第 n-1个检测周期的结束时间对应的频率偏移值, 并且 fn也同时可以为第 n个检测周期的开始时间对应的频率偏移值。每个检测周期内的第一频率偏 移变化值例如依次可以为: f2-fl、 Ώ-Ϊ2 fn-f(n-l) 。
当频率偏移检测结果为第一频率偏移变化值时, BTS 就将本步骤获取 的第一频率偏移变化值发送给 BSC, 即本步骤之后就执行步骤 304; 当频率 偏移检测结果不是上行信号的频率偏移值或第一频率偏移变化值时, 本步 骤之后执行步驟 a4。
步骤 a4、 BTS根据第一频率偏移变化值和门限值, 判断待检测终端的 频率偏移是否发生异常。 其中, 该门限值可以预先存储在 BTS中, 也可以 由 BSC发送给 BTS。
BTS将第一频率偏移变化值与门限值进行比较, 如果 N个第一频率偏 移变化值大于或等于门限值, 则判断待检测终端的频率偏移发生异常, 否 则, 判断待检测终端的频率偏移正常; 其中 N大于等于 1。
其中, 在步骤 a4的判断过程中, 还要考虑到检测持续时间。 该检测持 续时间包含在检测参数中, 是检测参数之一。 该检测持续时间表示进行检 测的总时间长度, 当在该总时间长度内没有检测到频率偏移发生异常, 则 认为频率偏移正常。具体的步骤 a4可以包括: 若在预定的检测持续时间内, 有 N个频率偏移变化值大于或等于门限值,则判断待检测的 GSM终端的频 率偏移发生异常, 否则, 判断待检测的 GSM终端的频率偏移正常; N > 1 , 其中 N的具体值可以根据具体情况而设定。
本步骤中得到了待检测终端的频率偏移是否发生异常的结果, 此时, 频率偏移检测结果为待检测终端的频率偏移是否发生异常; 然后执行步骤 304。
第二种方式:
步骤 al,、 BTS获取检测参数; 该检测参数包括时间间隔。
步骤 a2,、 BTS通过上行 AFC检测上行信号的每个空口帧的频率偏移 值。
BTS对上行信号的每个空口帧的频率偏移值都进行检测。
当频率偏移检测结果为空口帧的频率偏移值时, BTS 就将本步骤获取 的空口帧的频率偏移值发送给 BSC, 即本步骤之后就执行步驟 304; 当频率 偏移检测结果不是空口帧的频率偏移值时, 本步骤之后执行步骤 a3'。
步骤 a3,、 BTS根据每个空口帧的频率偏移值, 获得间隔时间间隔的任 意两个空口帧之间的第二频率偏移变化值。 第二频率偏移变化值为间隔时 间间隔的两个空口帧分别对应的两个频率偏移值的差值。 BTS获取到每个空口帧的频率偏移值 f 1、 f,2、 f3 fn 。 预设的时间间隔为 t, 其中相隔时间间隔 t的两个空口帧相间隔的空口帧数 为 k, 由此, 间隔时间间隔 t的任意两个空口帧之间的第二频率偏移变化值 例如依次可以为: f(k+l)-f,l、 f (k+2)-f'2 f (k+n)-fn 。
当频率偏移检测结果为第二频率偏移变化值时, BTS 就将本步骤获取 的第二频率偏移变化值发送给 BSC, 即本步骤之后就执行步骤 304; 当频率 偏移检测结果不是空口帧的频率偏移值或第二频率偏移变化值时, 本步骤 之后执行步骤 a4'。
步骤 a4,、 BTS根据第二频率偏移变化值和门限值, 判断待检测终端的 频率偏移是否发生异常。 其中, 该门限值可以预先存储在 BTS中, 也可以 由 BSC发送给 BTS。
BTS 将第二频率偏移变化值与门限值进行比较, 若在预设的检测持续 时间内, 达到 N个第二频率偏移变化值大于或等于门限值, 则判断待检测 终端的频率偏移发生异常, N大于或者等于 1。
本步骤具体可以参见上述步骤 a4中的描述, 在此不再赘述。 频率偏移检测结果为待检测终端的频率偏移是否发生异常; 然后执行步骤 304。
当采用上述第一种方式的检测判断方法时, 每经过一个检测周期, 才 能获得一个频率偏移变化值, 而采用上述第二种方式中的检测判断方法时, 只要经过了第一个检测周期, 以后每经过一个空口帧就能获得一个频率偏 移变化值, 由此可以更快的检测出频率偏移的结果。
需要说明的是, 在具体实现过程中, 当采用上述两种方式中的任一种 进行检测判断时, 不一定要在预定的检测持续时间结束后才判断终端是否 发生异常, 而可以实时的对大于或等于门限值的频率偏移变化值进行计数, 当计数的数值到达 N时, 即可以判断出终端的频率偏移异常。 步骤 304、 BTS将频率偏移检测结果发送给 BSC。
在步骤 303 中得到频率偏移检测结果后, BTS可以将包含该频率偏移 检测结果的信令通过 Abis接口发送给 BSC。
步骤 305、 BSC接收 BTS发送的频率偏移检测结果。
根据步骤 303 中的描述可知, BSC接收到的频率偏移检测结果可以是 以下参数中的任意一种: 上行信号的频率偏移值、 第一频率偏移变化值、 上行信号的空口帧的频率偏移值、 第二频率偏移变化值和待检测终端的频 率偏移是否发生异常。
步骤 306、 BSC根据频率偏移检测结果获知待检测终端的频率偏移是否 发生异常。
当频率偏移检测结果为上行信号的频率偏移值时, 步骤 306 的具体过 程可以包括: BSC 根据检测到的上行信号的频率偏移值, 获取每个检测周 期内的第一频率偏移变化值; 然后根据第一频率偏移变化值和预设的门限 值, 判断待检测终端的频率偏移是否发生异常。 本步骤具体的处理过程可 以参见步驟 a3和步骤 a4中的描述,本步骤与步骤 a3和步骤 a4的区别在于 执行主体不同。
当频率偏移检测结果为第一频率偏移变化值, 步骤 306 的具体过程可 以包括: BSC根据第一频率偏移变化值和预设的门限值, 判断待检测终端 的频率偏移是否发生异常。 本步骤具体的处理过程可以参见步骤 a4中的描 述, 本步骤与步骤 a4的区别在于执行主体不同。
当频率偏移检测结果为上行信号的空口帧的频率偏移值, 步骤 306 的 具体过程可以包括: BSC 根据空口帧的频率偏移值, 获取间隔时间间隔的 任意两个空口帧之间的第二频率偏移变化值; 然后根据第二频率偏移变化 值和预设的门限值, 判断待检测终端的频率偏移是否发生异常。 本步骤具 体的处理过程可以参见步骤 a3,和步骤 a4,中的描述, 本步驟与步骤 a3,和步 骤 a4,的区别在于执行主体不同。 当频率偏移检测结果为第二频率偏移变化值, 步骤 306 的具体过程可 以包括: BSC根据第二频率偏移变化值和预设的门限值, 判断待检测终端 的频率偏移是否发生异常。 本步骤具体的处理过程可以参见步骤 a4,中的描 述, 本步骤与步骤 a4,的区别在于执行主体不同。
当频率偏移检测结果为待检测终端的频率偏移是否发生异常时, BSC 直接就获知最终的检查结果。
步骤 307、 BSC将待检测终端的频率偏移是否发生异常的结杲和与待检 测终端的设备类型标识, 添加到频率偏移检测数据库中。
BSC 将接收到的待检测终端的频率偏移是否发生异常的检测结果与对 应的 GSM终端的设备类型标识一起添加到频率偏移检测数据库中, 以更新 该数据库。 其中, 该设备类型标识可以为 TAC, 该数据库采用终端的 TAC 作为索引。
为了减少实际网络发起检测的开销,在对一 GSM终端进行频率偏移检 测之前可以先在频率偏移检测数据库中查询, 也就是说, 在步 301之前, 可以包括以下步骤:
步骤 300、 BSC根据待检测终端的设备类型标识,在频率偏移检测数据 库中查询待检测终端对应的频率偏移是否发生异常的检测结果; 若未查询 到待检测终端对应的检测结杲, 则执行步骤 301。
若 BSC在频率偏移检测数据库中查询到该待检测终端所属类型的终端 对应的检测结果, 则可以直接根据检测结果进行后续步骤, 而无需再指示 BTS 对该待检测终端进行检测。 其中, 所述的后续步骤例如: 当该检测结 果为频率偏移发生异常, 则对该终端进行采取专门措施, 以保证该终端参 与 VAMOS复用后的语音质量; 当该检测结果为频率偏移正常, 则可以直 接使用该终端参与 VAMOS复用。
本发明实施例, 基站控制器可以向基站收发台发送检测指示信令, 以 指示基站收发台对该检测指示信令中指示的待检测语音业务信道的下行信 号进行加扰, 然后由基站收发台对加扰后的待检测语音业务信道的上行信 号进行频率偏移检测, 从而得到该待检测语音业务信道的下行信号被复用 时, 该待检测语音业务信道的上行信号的频率偏移检测结果, 并且基站控 制器接收基站收发台发送的该频率偏移检测结果, 以获知与该待检测终端 在参与 VAMOS技术时频率偏移是否会发生异常。 本发明实施例提供的方 法可以快速、 准确的识别出可能在 VAMOS复用时出现异常的终端, 而同 时对终端正常的语音业务质量影响较小。
本领域普通技术人员可以理解: 实现上述方法实施例的全部或部分步 骤可以通过程序指令相关的硬件来完成, 前述的程序可以存储于一计算机 可读取存储介质中, 该程序在执行时, 执行包括上述方法实施例的步骤; 前述的存储介廣包括: ROM、 RAM, 磁碟或者光盘等各种可以存储程序代 码的介质。
图 4为本发明一实施例提供的基站收发台的示意图, 如图 4所示, 该 基站收发台包括: 加扰模块 41、 检测模块 43和笫一发送模块 45。
加扰模块 41用于通过自适应正交相移键控调制技术对待检测终端对应 的待检测语音业务信道的下行信号进行加扰。
检测模块 43用于对加扰模块 41加扰后的待检测语音业务信道上的上 行信号进行频率偏移检测, 得到待检测语音业务信道的上行信号的频率偏 移检测结果。
第一发送模块 45用于将检测模块 43得到的频率偏移检测结果发送给 基站控制器。
本实施例中各个模块的工作流程和工作原理参见上述各方法实施例中 的描述, 在此不再赘述。
本发明实施例 , 加扰模块对待检测终端对应的待检测语音业务信道的 下行信号进行加扰, 然后检测模块对加扰后的待检测语音业务信道上的上 行信号进行频率偏移检测, 从而可以得到该待检测语音业务信道的下行信 号被复用时, 该待检测语音业务信道的上行信号的频率偏移检测结果, 并 由第一发送模块将该检测结果发送给基站控制器, 使得基站控制器获知与 该待检测终端在参与 VAMOS技术时频率偏移是否会发生异常。
图 5为本发明又一实施例提供的基站收发台的示意图, 如图 5所示, 在图 4所述实施例的基础上, 还包括: 第一接收模块 47。
第一接收模块 47用于接收基站控制器发送的第一信令, 第一信令包括 用于指示对待检测语音业务信道进行频率偏移检测的信元。
加扰模块 41具体可以用于: 通过自适应正交相移键控调制技术, 对待 检测语音业务信道的下行信号增加干扰信号; 干扰信号的训练序列与下行 信号的训练序列同类且正交, 干扰信号的非训练序列部分填充虚帧或随机 数, 且干扰信号的信号强度大于或等于下行信号的信号强度。
当频率偏移检测结果为上行信号的频率偏移值时, 检测模块 43具体可 以用于: 通过上行自动频率校正周期性地检测上行信号的频率偏移值; 此 时相当于检测模块 43只包括第一检测单元 431。
当频率偏移检测结果为第一频率偏移变化值时, 检测模块 43包括: 第 一检测单元 431和第一获取单元 433。
当频率偏移检测结果为待检测终端的频率偏移是否发生异常时, 检测 模块 43包括: 第一检测单元 431、 第一获取单元 433和第一判断单元 435。
第一检测单元 431 用于通过上行自动频率校正周期性地检测上行信号 的频率偏移值。 第一获取单元 433用于根据第一检测单元 431检测到的上 行信号的频率偏移值, 获取每个检测周期内的第一频率偏移变化值; 每个 检测周期内的第一频率偏移变化值等于一个检测周期的结束时刻对应的频 率偏移值与检测周期的开始时刻对应的频率偏移值的差值。 第一判断单元 435 用于根据第一获取单元 433 获取的第一频率偏移变化值和预设的门限 值, 判断待检测终端的频率偏移是否发生异常。
其中, 第一判断单元 435 具体用于: 若在预设的检测持续时间内, 达 到 N个第一频率偏移变化值大于或等于门限值, 则判断待检测终端的频率 偏移发生异常, N大于或者等于 1。
当频率偏移检测结果为空口帧的频率偏移值时,检测模块 43具体用于: 通过上行自动频率校正检测上行信号的空口帧的频率偏移值; 此时相当于 检测模块 43只包括第二检测单元 430。
当频率偏移检测结果为第二频率偏移变化值时, 检测模块 43包括: 第 二检测单元 430和第二获取单元 432。
当频率偏移检测结果为待检测终端的频率偏移是否发生异常时, 检测 模块 43包括: 第二检测单元 430、 第二获取单元 432和第二判断单元 434。
第二检测单元 430用于通过上行自动频率校正检测上行信号的空口帧 的频率偏移值。 第二获取单元 432用于根据第二检测单元检测到的空口帧 的频率偏移值, 获取间隔时间间隔的任意两个空口帧之间的第二频率偏移 变化值; 第二频率偏移变化值为间隔时间间隔的两个空口帧分别对应的两 个频率偏移值的差值。 第二判断单元 434用于根据第二获取单元 432获取 的第二频率偏移变化值和预设的门限值, 判断待检测终端的频率偏移是否 发生异常。
其中, 第二判断单元 434具体可以用于: 若在预设的检测持续时间内 , 达到 N个第二频率偏移变化值大于或等于门限值, 则判断待检测终端的频 率偏移发生异常, N大于或者等于 1。
本实施例中各个模块和单元的工作流程和工作原理参见上述各方法实 施例中的描述, 在此不再赘述。
本发明实施例, 基站收发台对该待检测语音业务信道的下行信号进行 加扰, 然后对加扰后的待检测语音业务信道的上行信号进行频率偏移检测 , 从而得到该待检测语音业务信道的下行信号被复用时, 该待检测语音业务 信道的上行信号的频率偏移检测结果, 并将该检测结果发送给基站控制器, 使得基站控制器获知与该待检测语音业务信道对应的待检测终端在参与 VAMOS技术时频率偏移是否会发生异常。本发明实施例提供的方法可以快 速、 准确的识别出可能在 VAMOS复用时出现异常的终端, 而同时对终端 正常的语音业务质量影响较小。
图 6为本发明一实施例提供的基站控制器的示意图, 如图 6所示, 该 基站控制器包括: 第二接收模块 61和获取模块 63。
第二接收模块 61用于接收基站收发台发送的、 基站收发台对加扰后的 待检测语音业务信道上的上行信号进行频率偏移检测得到的频率偏移检测 结果, 待检测语音业务信道为待检测终端对应的语音业务信道;
获取模块 63用于根据频率偏移检测结果获知待检测终端的频率偏移是 否发生异常。
本实施例中各个模块的工作流程和工作原理参见上述各方法实施例中 的描述, 在此不再赘述。
本发明实施例, 第二接收模块接收基站收发台发送的频率偏移检测结 杲, 该频率偏移检测结果是由基站收发台对加扰后的待检测语音业务信道 上的上行信号进行频率偏移检测得到的, 然后获取模块根据该频率偏移检 测结果获知与该待检测语音业务信道对应的待检测终端在参与 VAMOS技 术时频率偏移是否会发生异常。
图 7为本发明又一实施例提供的基站控制器的示意图, 如图 7所示, 在图 6所示实施例的基础上, 该基站控制器还包括: 第二发送模块 65和添 加模块 67。
第二发送模块 65用于向基站收发台发送第一信令; 第一信令包括用于 指示基站收发台对待检测语音业务信道进行频率偏移检测的信元。
添加模块 67用于将待检测终端的频率偏移是否发生异常的结果和与待 检测终端的设备类型标识, 添加到频率偏移检测数据库中。
当频率偏移检测结果为上行信号的频率偏移值, 获取模块 63包括: 第 三获取单元 631和第三判断单元 633。 当频率偏移检测结果为第一频率偏移变化值时, 获取模块 63包括第三 判断单元 633。第一频率偏移变化值等于一个检测周期的结束时刻对应的频 率偏移值与检测周期的开始时刻对应的频率偏移值的差值,
第三获取单元 631 用于根据检测到的上行信号的频率偏移值, 获取每 个检测周期内的第一频率偏移变化值; 每个检测周期内的第一频率偏移变 化值等于一个检测周期的结束时刻对应的频率偏移值与检测周期的开始时 刻对应的频率偏移值的差值。 第三判断单元 633 用于才艮据第一频率偏移变 化值和预设的门限值, 判断待检测终端的频率偏移是否发生异常。
其中, 第三判断单元 633 具体用于: 若在预设的检测持续时间内, 达 到 N个频率偏移变化值大于或等于门限值, 则判断待检测终端的频率偏移 发生异常, N大于或者等于 1。
当频率偏移检测结果为上行信号的空口帧的频率偏移值是, 获取模块 63包括: 第四获取单元 630和第四判断单元 632。
当频率偏移检测结果为第二频率偏移变化值时, 获取模块 63包括: 第 四判断单元 632。第二频率偏移变化值为间隔时间间隔的两个空口帧分别对 应的两个频率偏移值的差值。
第四获取单元 630用于根据空口帧的频率偏移值, 获取间隔时间间隔 的任意两个空口帧之间的第二频率偏移变化值; 第二频率偏移变化值为间 隔时间间隔的两个空口帧分别对应的两个频率偏移值的差值。 第四判断单 元 632用于根据第二频率偏移变化值和预设的门限值, 判断待检测终端的 频率偏移是否发生异常。
其中, 第四判断单元 632具体用于: 若在预设的检测持续时间内, 达 到 N个频率偏移变化值大于或等于门限值, 则判断待检测终端的频率偏移 发生异常, N大于或者等于 1。
本实施例中各个模块的工作流程和工作原理参见上述各方法实施例中 的描述, 在此不再赘述。 本发明实施例, 基站控制器可以向基站收发台发送检测指示信令, 以 指示基站收发台对该检测指示信令中指示的待检测语音业务信道的下行信 号进行加扰, 然后由基站收发台对加扰后的待检测语音业务信道的上行信 号进行频率偏移检测, 从而得到该待检测语音业务信道的下行信号被复用 时, 该待检测语音业务信道的上行信号的频率偏移检测结果, 并且基站控 制器接收基站收发台发送的该频率偏移检测结果, 以获知与该待检测终端 在参与 VAMOS技术时频率偏移是否会发生异常。 本发明实施例提供的方 法可以快速、 准确的识别出可能在 VAMOS复用时出现异常的终端, 而同 时对终端正常的语音业务质量影响较小。
本发明实施例还提供一种终端频率偏移检测系统, 包括本发明实施例 提供的任一基站收发台和本发明实施例提供的任一基站控制器。
本实施例中的基站收发台和基站控制器的工作流程和工作原理参见上 述各方法实施例中的描述, 在此不再赘述。
本发明实施例的优点参见上述实施例的具体描述, 在此不再赘述。 最后应说明的是: 以上实施例仅用以说明本发明的技术方案, 而非对 其限制; 尽管参照前述实施例对本发明进行了详细的说明, 本领域的普通 技术人员应当理解: 其依然可以对前述各实施例所记载的技术方案进行修 改, 或者对其中部分技术特征进行等同替换; 而这些修改或者替换, 并不 使相应技术方案的本质脱离本发明各实施例技术方案的精神和范围。

Claims

权利要求
1、 一种终端频率偏移检测方法, 其特征在于, 包括:
通过自适应正交相移键控调制技术对待检测终端对应的待检测语音业 务信道的下行信号进行加扰;
对加扰后的所述待检测语音业务信道上的上行信号进行频率偏移检 测, 得到所述待检测语音业务信道的上行信号的频率偏移检测结果;
将所述频率偏移检测结果发送给基站控制器。
2、 根据权利要求 1所述的终端频率偏移检测方法, 其特征在于, 所述 通过自适应正交相移键控调制技术对待检测终端对应的待检测语音业务信 道的下行信号进行加扰之前还包括:
接收基站控制器发送的第一信令, 所述第一信令包括用于指示对所述 待检测语音业务信道进行频率偏移检测的信元。
3、 根据权利要求 1所述的终端频率偏移检测方法, 其特征在于, 所述 通过自适应正交相移键控调制技术对待检测终端对应的待检测语音业务信 道的下行信号进行加扰包括:
通过自适应正交相移键控调制技术, 对所述待检测语音业务信道的下 行信号增加干扰信号; 所述干扰信号的训练序列与所述下行信号的训练序 列同类且正交, 所述干扰信号的非训练序列部分填充虚帧或随机数, 且所 述千扰信号的信号强度大于或等于所述下行信号的信号强度。
4、根据权利要求 1-3任一所述的终端频率偏移检测方法,其特征在于, 所述对加扰后的所述待检测语音业务信道上的上行信号进行频率偏移检测 包括:
通过上行自动频率校正周期性地检测所述上行信号的频率偏移值; 则 所述频率偏移检测结果为所述上行信号的频率偏移值。
5、根据权利要求 1-3任一所述的终端频率偏移检测方法,其特征在于, 所述对加扰后的所述待检测语音业务信道上的上行信号进行频率偏移检测 包括:
通过上行自动频率校正周期性地检测所述上行信号的频率偏移值; 根据检测到的所述上行信号的频率偏移值, 获取每个检测周期内的第 一频率偏移变化值; 所述每个检测周期内的第一频率偏移变化值等于一个 检测周期的结束时刻对应的频率偏移值与所述检测周期的开始时刻对应的 频率偏移值的差值; 则所述频率偏移检测结果为所述第一频率偏移变化值。
6、根据权利要求 1-3任一所述的终端频率偏移检测方法,其特征在于, 所述对加扰后的所述待检测语音业务信道上的上行信号进行频率偏移检测 包括:
通过上行自动频率校正周期性地检测所述上行信号的频率偏移值; 根据检测到的所述上行信号的频率偏移值, 获取每个检测周期内的第 一频率偏移变化值; 所述每个检测周期内的第一频率偏移变化值等于一个 检测周期的结束时刻对应的频率偏移值与所述检测周期的开始时刻对应的 频率偏移值的差值;
根据所述第一频率偏移变化值和预设的门限值, 判断所述待检测终端 的频率偏移是否发生异常; 则所述频率偏移检测结果为所述待检测终端的 频率偏移是否发生异常。
7、 根据权利要求 6所述的终端频率偏移检测方法, 其特征在于, 根据 所述第一频率偏移变化值和预设的门限值, 判断所述待检测终端的频率偏 移是否发生异常的过程包括:
若在预设的检测持续时间内, 达到 N个所述第一频率偏移变化值大于 或等于所述门限值, 则判断所述待检测终端的频率偏移发生异常, 所述 N 大于或者等于 1。
8、根据权利要求 1-3任一所述的终端频率偏移检测方法,其特征在于, 所述对加扰后的所述待检测语音业务信道上的上行信号进行频率偏移检测 包括:
通过上行自动频率校正检测所述上行信号的空口帧的频率偏移值; 则 所述频率偏移检测结果为所述空口帧的频率偏移值。
9、根据权利要求 1-3任一所述的终端频率偏移检测方法,其特征在于, 所述对加扰后的所述待检测语音业务信道上的上行信号进行频率偏移检测 包括:
通过上行自动频率校正检测所述上行信号的空口帧的频率偏移值; 所 述频率偏移检测结果为所述空口帧的频率偏移值;
根据所述空口帧的频率偏移值, 获取间隔所述时间间隔的任意两个空 口帧之间的第二频率偏移变化值; 所述第二频率偏移变化值为间隔所述时 间间隔的两个空口帧分别对应的两个频率偏移值的差值; 则所述频率偏移 检测结果为所述第二频率偏移变化值。
10、根据权利要求 1-3任一所述的终端频率偏移检测方法,其特征在于, 所述对加扰后的所述待检测语音业务信道上的上行信号进行频率偏移检测 包括:
通过上行自动频率校正检测所述上行信号的空口帧的频率偏移值; 所 述频率偏移检测结果为所述空口帧的频率偏移值;
根据所述空口帧的频率偏移值, 获取间隔所述时间间隔的任意两个空 口帧之间的第二频率偏移变化值; 所述第二频率偏移变化值为间隔所述时 间间隔的两个空口帧分别对应的两个频率偏移值的差值;
根据所述第二频率偏移变化值和预设的门限值, 判断所述待检测终端 的频率偏移是否发生异常; 则所述频率偏移检测结果为所述待检测终端的 频率偏移是否发生异常。
11、 根据权利要求 10所述的终端频率偏移检测方法, 其特征在于, 根 据所述第二频率偏移变化值和所述门限值, 判断所述待检测终端的频率偏 移是否发生异常的过程包括: 若在预设的检测持续时间内, 达到 N个所述第二频率偏移变化值大于 或等于所述门限值, 则判断所述待检测终端的频率偏移发生异常, 所述 N 大于或者等于 1。
12、 一种终端频率偏移检测方法, 其特征在于, 包括:
接收基站收发台发送的、 所述基站收发台对加扰后的待检测语音业务 信道上的上行信号进行频率偏移检测得到的频率偏移检测结果, 所述待检 测语音业务信道为待检测终端对应的语音业务信道;
根据所述频率偏移检测结果获知所述待检测终端的频率偏移是否发生 异常。
13、 根据权利要求 12所述的终端频率偏移检测方法, 其特征在于, 还 包括:
向所述基站收发台发送第一信令; 所述第一信令包括用于指示所述基 站收发台对所述待检测语音业务信道进行频率偏移检测的信元。
14、 根据权利要求 12所述的终端频率偏移检测方法, 其特征在于, 所 述频率偏移检测结果为所述上行信号的频率偏移值, 所述根据所述频率偏 移检测结果获知所述待检测终端的频率偏移是否发生异常包括:
根据检测到的所述上行信号的频率偏移值, 获取每个检测周期内的第 一频率偏移变化值; 所述每个检测周期内的第一频率偏移变化值等于一个 检测周期的结束时刻对应的频率偏移值与所述检测周期的开始时刻对应的 频率偏移值的差值;
根据所述第一频率偏移变化值和预设的门限值, 判断所述待检测终端 的频率偏移是否发生异常。
15、 根据权利要求 12所述的终端频率偏移检测方法, 其特征在于, 所 述频率偏移检测结果为第一频率偏移变化值, 所述第一频率偏移变化值等 于一个检测周期的结束时刻对应的频率偏移值与所述检测周期的开始时刻 对应的频率偏移值的差值, 所述根据所述频率偏移检测结果获知所述待检 测终端的频率偏移是否发生异常包括:
根据所述第一频率偏移变化值和预设的门限值, 判断所述待检测终端 的频率偏移是否发生异常。
16、 根据权利要求 14或 15所述的终端频率偏移检测方法, 其特征在 于, 所述根据所述第一频率偏移变化值和预设的门限值, 判断所述待检测 终端的频率偏移是否发生异常包括:
若在预设的检测持续时间内 , 达到 N个所述频率偏移变化值大于或等 于所述门限值, 则判断所述待检测终端的频率偏移发生异常, 所述 N大于 或者等于 1。
17、 根据权利要求 12所述的终端频率偏移检测方法, 其特征在于, 所 述频率偏移检测结果为所述上行信号的空口帧的频率偏移值, 所述根据所 述频率偏移检测结果获知所述待检测终端的频率偏移是否发生异常包括: 根据所述空口帧的频率偏移值, 获取间隔所述时间间隔的任意两个空 口帧之间的第二频率偏移变化值; 所述笫二频率偏移变化值为间隔所述时 间间隔的两个空口帧分别对应的两个频率偏移值的差值;
根据所述第二频率偏移变化值和预设的门限值, 判断所述待检测终端 的频率偏移是否发生异常。
18、 根据权利要求 12所述的终端频率偏移检测方法, 其特征在于, 所 述频率偏移检测结果为第二频率偏移变化值, 所述第二频率偏移变化值为 间隔所述时间间隔的两个空口帧分别对应的两个频率偏移值的差值, 所述 根据所述频率偏移检测结果获知所述待检测终端的频率偏移是否发生异常 包括:
根据所述第二频率偏移变化值和预设的门限值, 判断所述待检测终端 的频率偏移是否发生异常。
19、 根据权利要求 17或 18所述的终端频率偏移检测方法, 其特征在 于, 所述根据所述第二频率偏移变化值和预设的门限值, 判断所述待检测 终端的频率偏移是否发生异常包括:
若在预设的检测持续时间内, 达到 N个所述频率偏移变化值大于或等 于所述门限值, 则判断所述待检测终端的频率偏移发生异常, 所述 N大于 或者等于 1。
20、 根据权利要求 12所述的终端频率偏移检测方法, 其特征在于, 还 包括:
将所述待检测终端的频率偏移是否发生异常的结杲和与所述待检测终 端的设备类型标识, 添加到频率偏移检测数据库中。
21、 一种基站收发台, 其特征在于, 包括:
加扰模块, 用于通过自适应正交相移键控调制技术对待检测终端对应 的待检测语音业务信道的下行信号进行加扰;
检测模块, 用于对所述加扰模块加扰后的所述待检测语音业务信道上 的上行信号进行频率偏移检测, 得到所述待检测语音业务信道的上行信号 的频率偏移检测结果;
第一发送模块, 用于将所述检测模块得到的所述频率偏移检测结果发 送给基站控制器。
22、 根据权利要求 21所述的基站收发台, 其特征在于, 还包括: 第一接收模块, 用于接收基站控制器发送的第一信令, 所述第一信令 包括用于指示对所述待检测语音业务信道进行频率偏移检测的信元。
23、 根据权利要求 21所述的基站收发台, 其特征在于, 所述加扰模块 具体用于: 通过自适应正交相移键控调制技术, 对所述待检测语音业务信 道的下行信号增加干扰信号; 所述干扰信号的训练序列与所述下行信号的 训练序列同类且正交, 所述干扰信号的非训练序列部分填充虚帧或随机数, 且所述干扰信号的信号强度大于或等于所述下行信号的信号强度。
24、 根据权利要求 21-23任一所述的基站收发台, 其特征在于, 所述检 测模块包括: 第一检测单元, 用于通过上行自动频率校正周期性地检测所述上行信 号的频率偏移值。
25、 根据权利要求 24所述的基站收发台, 其特征在于, 所述检测模块 还包括:
第一获取单元, 用于根据所述第一检测单元检测到的所述上行信号的 频率偏移值, 获取每个检测周期内的第一频率偏移变化值; 所述每个检测 周期内的第一频率偏移变化值等于一个检测周期的结束时刻对应的频率偏 移值与所述检测周期的开始时刻对应的频率偏移值的差值。
26、 根据权利要求 25所述的基站收发台, 其特征在于, 所述检测模块 还包括:
第一判断单元, 用于根据所述第一获取单元获取的所述第一频率偏移 变化值和预设的门限值, 判断所述待检测终端的频率偏移是否发生异常。
27、 根据权利要求 26所述的基站收发台, 其特征在于, 所述第一判断 单元具体用于: 若在预设的检测持续时间内, 达到 N个所述第一频率偏移 变化值大于或等于所述门限值, 则判断所述待检测终端的频率偏移发生异 常, 所述 N大于或者等于 1。
28、 根据权利要求 21-23任一所述的基站收发台, 其特征在于, 所述检 测模块包括:
第二检测单元, 用于通过上行自动频率校正检测所述上行信号的空口 帧的频率偏移值。
29、 根据权利要求 28所述的基站收发台, 其特征在于, 所述检测模块 还包括:
第二获取单元, 用于根据所述第二检测单元检测到的所述空口帧的频 率偏移值, 获取间隔所述时间间隔的任意两个空口帧之间的第二频率偏移 变化值; 所述第二频率偏移变化值为间隔所述时间间隔的两个空口帧分别 对应的两个频率偏移值的差值。
30、 根据权利要求 29所述的基站收发台, 其特征在于, 所述检测模块 还包括:
第二判断单元, 用于根据所述第二获取单元获取的所述第二频率偏移 变化值和预设的门限值, 判断所述待检测终端的频率偏移是否发生异常。
31、 根据权利要求 30所述的基站收发台, 其特征在于, 所述第二判断 单元具体用于: 若在预设的检测持续时间内, 达到 N个所述第二频率偏移 变化值大于或等于所述门限值, 则判断所述待检测终端的频率偏移发生异 常, 所述 N大于或者等于 1。
32、 一种基站控制器, 其特征在于, 包括:
第二接收模块, 用于接收基站收发台发送的、 所述基站收发台对加扰 后的待检测语音业务信道上的上行信号进行频率偏移检测得到的频率偏移 检测结果, 所述待检测语音业务信道为待检测终端对应的语音业务信道; 获取模块, 用于根据所述频率偏移检测结果获知所述待检测终端的频 率偏移是否发生异常。
33、 根据权利要求 32所述的基站控制器, 其特征在于, 还包括: 第二发送模块, 用于向所述基站收发台发送第一信令; 所述第一信令 包括用于指示所述基站收发台对所述待检测语音业务信道进行频率偏移检 测的信元。
34、 根据权利要求 32所述的基站控制器, 其特征在于, 所述获取模块 包括: 第三获取单元和第三判断单元, 或者, 所述获取模块包括第三判断 单元;
第三获取单元, 用于根据检测到的所述上行信号的频率偏移值, 获取 每个检测周期内的第一频率偏移变化值; 所述每个检测周期内的第一频率 偏移变化值等于一个检测周期的结束时刻对应的频率偏移值与所述检测周 期的开始时刻对应的频率偏移值的差值;
第三判断单元, 用于根据所述第一频率偏移变化值和预设的门限值, 判断所述待检测终端的频率偏移是否发生异常。
35、 根据权利要求 34所述的基站控制器, 其特征在于, 所述第三判断 单元具体用于: 若在预设的检测持续时间内, 达到 N个所述频率偏移变化 值大于或等于所述门限值, 则判断所述待检测终端的频率偏移发生异常, 所述 N大于或者等于 1。
36、 根据权利要求 32所述的基站控制器, 其特征在于, 所述获取模块 包括: 第四获取单元和第四判断单元, 或者所述获取模块包括: 第四判断 单元;
第四获取单元, 用于根据所述空口帧的频率偏移值, 获取间隔所述时 间间隔的任意两个空口帧之间的第二频率偏移变化值; 所述第二频率偏移 变化值为间隔所述时间间隔的两个空口帧分别对应的两个频率偏移值的差 值;
第四判断单元, 用于根据所述第二频率偏移变化值和预设的门限值, 判断所述待检测终端的频率偏移是否发生异常。
37、 根据权利要求 36所述的基站控制器, 其特征在于, 所述第四判断 单元具体用于: 若在预设的检测持续时间内, 达到 N个所述频率偏移变化 值大于或等于所述门限值, 则判断所述待检测终端的频率偏移发生异常, 所述 N大于或者等于 1。
38、 根据权利要求 32所述的基站控制器, 其特征在于, 还包括: 添加模块, 用于将所述待检测终端的频率偏移是否发生异常的结果和 与所述待检测终端的设备类型标识, 添加到频率偏移检测数据库中。
39、一种终端频率偏移检测系统, 包括如权利要求 21-31任一所述的基 站收发台和如权利要求 32-38任一所述的基站控制器。
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