CN103067988B - A kind of method and device improving handover success rate - Google Patents
A kind of method and device improving handover success rate Download PDFInfo
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Abstract
The present invention relates to wireless communication technology, disclose a kind of method and the device that improve handover success rate, the problem that the frequency deviation for avoiding due to source cell base station and target cell base station causes handover success rate lower.The method is: after target cell base station receives the handover request order of source cell base station, for cutting local terminal distribution channel, and communicates with terminal on this channel, then, the signal that target cell base station sends according to terminal, estimate the frequency deviation value of frequency relative to local crystal oscillator frequency of the signal in handoff procedure received by this locality, finally, target cell base station is according to frequency deviation value, to the receive frequency of the up signaling in handoff procedure or/and the transmission frequency of downlink signaling adjusts, like this, when the receive frequency of target cell base station and source cell base station is or/and when transmission frequency is different, avoid in the terminal switching process existed in prior art, due to the problem that the frequency deviation of source cell base station and target cell base station causes handover success rate lower.
Description
Technical Field
The present invention relates to the field of wireless communication technologies, and in particular, to a method and an apparatus for improving a handover success rate.
Background
In a wireless communication system, when a User Equipment (UE) moves from a current cell (source cell) to another cell (target cell) and the target cell exceeds a wireless coverage of the current cell, in order to ensure normal communication of the UE, a network side needs to initiate inter-cell handover to handover current normal communication from the source cell to the target cell, so that the UE can perform seamless communication between the cells.
The switching of the UE between the cells is used as an important control means of a wireless link, and the continuity of conversation when the user equipment passes through different cells can be kept. However, many factors such as time-varying property, signal coverage asymmetry, and frequency offset problem in a wireless environment are combined together to cause a handover success rate to decrease, which finally affects call continuity, and directly causes a user perception to decrease.
With the development of the third generation mobile communication technology (3rd-generation, 3G), various high-speed wireless applications are continuously changing the lifestyle of human beings. Because the 2.1GHz frequency band resource adopted by the 3G network has large transmission loss and space loss, the penetration capacity to the building wall is very weak, and the biggest problem faced by an operator is poor indoor coverage quality.
However, with the widespread use of femtos, new application problems gradually emerge, one of which is that the frequency accuracy of a Femto is difficult to meet the expected requirements due to the cost problem, the backhaul problem and the placement problem of the Femto, when multiple femtos are used for indoor cooperative coverage or the Femto and a macro network cooperatively cover, large frequency offsets are generated between the femtos and between the femtos and the macro station, when a terminal moves between cells where the base stations are located, cell switching may occur, and since the synchronization of the signal receiving frequency or the signal transmitting frequency of a source cell base station and a target cell base station is difficult to achieve, the switching success rate is low, and the user perception is seriously affected.
For example, as shown in fig. 1, when a terminal moves from a source cell base station to a target cell base station, a measurement indicator of the terminal at the source cell base station gradually deteriorates, and a measurement indicator at the target cell base station gradually becomes better, and in order to achieve continuity of coverage, the source base station triggers a handover of the terminal cell, where a local frequency of the source cell base station is F, a local frequency of the target cell base station is F + Δ F, and when Δ F is smaller than a frequency offset value that can be tolerated by demodulation of the base station, the handover can be performed normally, but when Δ F is larger than a frequency offset value that can be tolerated by demodulation of the base station, the base station or the terminal cannot demodulate handover process signaling, so that the handover fails.
In the prior art, there are various methods for improving the handover success rate, but more factors are considered in the aspects of wireless link time variation and coverage symmetry, so that the handover success rate is low, and none of the methods considers the problem that the handover success rate is low due to the frequency offset between the source cell base station and the target cell base station.
For example, patent application No.: 200610073011.8, a method for improving the success rate of switching, disclose a method for improving the success rate of switching, this method is through increasing the user equipment and shaking hands the function with the base station up-chain of the target cell, to eliminate under the asymmetric condition of up-down coverage, only judge whether to switch according to the downlink and cause the up-chain to cover and is not guaranteed, and then improve the success rate of switching, this method has improved the success rate of switching to a certain extent, but, still can't overcome the frequency deviation of source cell base station and base station of target cell and cause the lower defect of success rate of switching.
For example, patent application No.: PCT/CN2010/071419, handover method, andbas handover of, discloses a method for improving handover success rate, the method comprising: the method comprises the steps that a source cell base station simultaneously sends a switching request message to a plurality of alternative base stations, the alternative base stations feed back respective working load, whether switching-in is allowed or not and channel allocation information to the source cell base station, and the source cell base station selects a target cell base station with the smallest load as a switching-in object so as to reduce the probability of increasing switching delay due to switching-in channel blockage and improve the switching success rate.
In summary, there is no method for improving the handover success rate by eliminating the frequency offset between the source cell base station and the target cell base station.
Disclosure of Invention
The embodiment of the invention provides a method and a device for improving the switching success rate, which are used for solving the problem of low switching success rate caused by frequency offset of a source cell base station and a target cell base station in the prior art.
A method of improving handover success rate, comprising:
after receiving a switching request command of a source cell base station, a target cell base station allocates a channel for a terminal switched into the cell base station by the source cell base station and communicates with the terminal on the channel;
the target cell base station estimates a frequency offset value of the frequency of a signal received locally in the switching process relative to the frequency of a local crystal oscillator according to the signal sent by the terminal;
and the target cell base station adjusts the receiving frequency of the uplink signaling or/and the sending frequency of the downlink signaling in the switching process according to the frequency offset value.
An apparatus for improving handover success rate, comprising:
a receiving unit, configured to allocate a channel to a terminal switched from a source cell base station to the device after receiving a handover request command from the source cell base station, and communicate with the terminal on the channel;
the estimating unit is used for estimating a frequency offset value of the frequency of the signal received locally in the switching process relative to the frequency of the local crystal oscillator according to the signal sent by the terminal;
and the adjusting unit is used for adjusting the receiving frequency of the uplink signaling or/and the sending frequency of the downlink signaling in the switching process according to the frequency offset value.
In the embodiment of the invention, after receiving a switching request command of a source cell base station, a target cell base station allocates a channel for a terminal switched into the cell base station by the source cell base station and communicates with the terminal on the channel; then, the target cell base station estimates the frequency offset value of the frequency of the locally received signal relative to the local crystal oscillator frequency in the switching process according to the signal sent by the terminal, and finally, the target cell base station adjusts the receiving frequency of the uplink signaling or/and the sending frequency of the downlink signaling in the switching process according to the frequency offset value, so that when the frequencies of the target cell base station and the source cell base station are asynchronous, the receiving frequency of the uplink signaling or/and the sending frequency of the downlink signaling in the switching process are adjusted by calculating the frequency offset value of the frequency of the locally received signal relative to the local crystal oscillator frequency in the process of switching the terminal from the source cell base station to the target cell base station, thereby avoiding the problem of low switching success rate caused by the frequency offset of the source cell base station and the target cell base station in the terminal switching process in the prior art, and the complexity of the implementation process is low.
Drawings
Fig. 1 is a schematic diagram of a terminal in a handover process in the prior art;
fig. 2 is a flowchart of improving the success rate of terminal handover in the embodiment of the present invention;
fig. 3 is a schematic diagram of signaling interaction between a terminal and a target cell base station in the embodiment of the present invention;
fig. 4 is a functional structure diagram of a terminal in an embodiment of the present invention.
Detailed Description
In order to avoid the problem of low switching success rate in the terminal switching process caused by the frequency offset of a source cell base station and a target cell base station, in the embodiment of the invention, after the target cell base station receives a switching request command of the source cell base station, a channel is allocated for a terminal switched into the cell base station by the source cell base station, and the terminal is communicated with the channel; then, the target cell base station estimates the frequency offset value of the frequency of the locally received signal relative to the local crystal oscillator frequency in the switching process according to the signal sent by the terminal, and finally, the target cell base station adjusts the receiving frequency of the uplink signaling or/and the sending frequency of the downlink signaling in the switching process according to the frequency offset value, so that when the frequencies of the target cell base station and the source cell base station are asynchronous, the receiving frequency of the uplink signaling or/and the sending frequency of the downlink signaling in the switching process are adjusted by calculating the frequency offset value of the frequency of the locally received signal relative to the local crystal oscillator frequency in the process of switching the terminal from the source cell base station to the target cell base station, thereby avoiding the problem of low switching success rate caused by the frequency offset of the source cell base station and the target cell base station in the terminal switching process in the prior art, and the complexity of the implementation process is low.
Based on the above technical solution, referring to fig. 2, in the embodiment of the present invention, a detailed process for improving the success rate of terminal handover by a target cell base station is as follows:
step 200: after receiving the switching request command of the source cell base station, the target cell base station allocates a channel for the terminal switched into the cell base station by the source cell base station and communicates with the terminal on the channel.
In the embodiment of the invention, when the terminal is switched from the source cell base station to the target cell base station, the source cell base station starts switching, and after the source cell base station starts switching, the switching request command is sent to the target cell base station, and after the target cell base station receives the switching request command from the source cell base station, the target cell base station distributes a channel for the terminal switched into the cell and communicates with the terminal on the channel.
Step 210: and the target cell base station estimates the frequency offset value of the frequency of the signal received locally relative to the frequency of the local crystal oscillator in the switching process according to the signal sent by the terminal.
In the embodiment of the present invention, the target cell base station estimates, according to the signal sent by the terminal, a frequency offset value of the frequency of the locally received signal relative to the local crystal oscillator frequency in the switching process, and the frequency offset value has various estimation methods, preferably, the target cell base station may estimate, according to the signal sent by the terminal, a frequency offset value of the frequency of the locally received signal relative to the local crystal oscillator frequency in the switching process by using a differential algorithm, or may estimate a frequency offset value of the frequency of the locally received signal relative to the local crystal oscillator frequency in the switching process by using an iterative algorithm, where the frequency of the locally received signal is the frequency of the signal actually received by the target cell base station each time, and the frequency of the locally received signal each time may be the same or different; the local crystal oscillator frequency is the inherent property of the target cell base station, and when the target cell base station is determined, the local crystal oscillator frequency is also determined.
In the embodiment of the present invention, when the target cell base station estimates the frequency offset value of the frequency of the locally received signal relative to the local crystal oscillator frequency in the switching process according to the signal sent by the terminal, the frequency offset value of the frequency of the locally received signal relative to the local crystal oscillator frequency in the switching process may be estimated according to the first signal sent by the terminal at the initial stage of switching, or the frequency offset value of the frequency of the locally received signal relative to the local crystal oscillator frequency in the current switching process may be estimated according to the received signal every time the signal sent by the terminal is received in the switching process.
The terminal may send the first signal only once or N times at the initial stage of switching, so that when the target cell base station estimates a frequency offset value of the frequency of the locally received signal relative to the local crystal oscillator frequency in the switching process according to the first signal sent by the terminal at the initial stage of switching, the frequency offset value of the frequency of the locally received signal relative to the local crystal oscillator frequency in the switching process may be estimated according to the first signal sent by the terminal at any time at the initial stage of switching, or the frequency offset value of the frequency of the locally received signal relative to the local crystal oscillator frequency in the switching process may be estimated according to all the first signals sent by the terminal at the initial stage of switching, where N is a positive integer greater than 1, and a specific value of N is related to an adopted network system.
Wherein, there are several ways for the target cell base station to estimate the frequency offset value of the frequency of the locally received signal relative to the local crystal oscillator frequency in the switching process according to all the first signals sent by the terminal at the initial stage of switching, preferably, there are several ways to estimate the frequency offset value of the frequency of the locally received signal relative to the local crystal oscillator frequency of the corresponding first signal in the switching process according to the first signal sent by the terminal each time at the initial stage of switching, and then obtain the frequency offset value of the frequency of the locally received signal relative to the local crystal oscillator frequency in the switching process by weighting operation on all the obtained single estimated frequency offset values, wherein there are several ways to calculate the weight value corresponding to each single estimated frequency offset value, preferably, the weight value corresponding to each single estimated frequency offset value can be calculated by an averaging method (i.e. the weight value corresponding to each single estimated frequency offset value is a ratio of one divided by the total number of sending the first signal), it can also be calculated by forgetting factor method (i.e. the weight value increases with the increase of the number of sending times).
For example, the terminal transmits the first signal four times, and if the frequency offset value of the locally received signal of the first signal with respect to the local crystal frequency is a, the frequency offset value of the locally received signal of the second signal with respect to the local crystal frequency is B, the frequency offset value of the locally received signal of the third signal with respect to the local crystal frequency is C, the frequency offset value of the locally received signal of the fourth signal with respect to the local crystal frequency is D, and the finally obtained frequency offset value of the locally received signal with respect to the local crystal frequency in the switching process is E, where the weight value of a is a, the weight value of B is B, the weight value of C is C, and the weight value of D is D, then the calculation formula of E is as follows:
e ═ a + B + C + D ═ D (formula one)
There are various ways to calculate a, b, c, d, for example, an average method is used to obtain 25% of a, b, c, d; alternatively, the forgetting factor method was used to obtain 5% of a, 15% of b, 35% of c and 45% of d.
Step 220: and the target cell base station adjusts the receiving frequency of the uplink signaling or/and the sending frequency of the downlink signaling in the switching process according to the frequency offset value.
In the embodiment of the present invention, because the target cell base station may estimate, according to the first signal sent by the terminal at the initial stage of handover, a frequency offset value of the frequency of the locally received signal relative to the local crystal oscillator frequency in the handover process, or may estimate, according to the currently received signal, a frequency offset value of the frequency of the locally received signal relative to the local crystal oscillator frequency in the current handover process every time the signal sent by the terminal is received in the handover process, therefore, the target cell base station may adjust, according to the frequency offset value, the receiving frequency of the uplink signaling or/and the sending frequency of the downlink signaling in the handover process in a plurality of ways, for example, if the target cell base station estimates, according to the first signal sent by the terminal at the initial stage of handover, a frequency offset value of the frequency of the locally received signal relative to the local crystal oscillator frequency in the handover process, the target cell base station may determine, according to the frequency offset value, respectively adjusting the receiving frequency of each uplink signaling or/and the sending frequency of each downlink signaling in the switching process; if the target cell base station receives a signal sent by the terminal every time in the switching process, and estimates the frequency offset value of the frequency of the signal received locally in the current switching process relative to the frequency of the local crystal oscillator according to the received signal, aiming at the frequency offset value estimated at any time, the target cell base station estimates the receiving frequency of each uplink signaling or/and the sending frequency of each downlink signaling in the current switching process according to the frequency offset value estimated at any time from the current time to before the next signal sent by the terminal is received, namely the target cell base station estimates the frequency offset value every time the signal sent by the terminal is received, and adjusts the frequency of the receiving frequency of the currently received uplink signaling according to the frequency offset value, or/and adjusts the sending frequency of the downlink signaling sent after the uplink signaling is received, and then, the target cell base station adjusts the receiving frequency of the currently received uplink signaling according to the newly estimated frequency offset value, or/and adjusts the transmitting frequency of the downlink signaling sent after receiving the uplink signaling until receiving the signal … … sent again by the terminal, and so on, which will not be described in detail any more.
In the embodiment of the present invention, there are various ways for the target cell base station to adjust the receiving frequency of the uplink signaling in the switching process according to the frequency offset value, and preferably, the receiving frequency of the uplink signaling in the switching process is adjusted by adopting an uplink radio frequency local oscillation pre-offset receiving way, an intermediate frequency shift pre-offset way, or a baseband frequency offset adjusting way according to the frequency offset value.
Meanwhile, there are multiple ways for the target cell base station to adjust the sending frequency of the downlink signaling in the switching process according to the frequency offset value, and preferably, the sending frequency of the downlink signaling in the switching process is adjusted by adopting a downlink radio frequency local oscillation pre-offset sending way, an intermediate frequency moving pre-offset way or a baseband frequency offset pre-offset way according to the frequency offset value.
In the embodiment of the present invention, after estimating, according to a signal sent by a terminal, a frequency offset value of a frequency of a signal received locally in a switching process relative to a local crystal oscillator frequency, a target cell base station necessarily adjusts, according to the frequency offset value, a receiving frequency of all uplink signaling in the switching process, but does not necessarily adjust, according to the frequency offset value, a sending frequency of downlink signaling in the switching process, that is, the target cell base station adjusts, according to the frequency offset value, the receiving frequency of all uplink signaling in the switching process, and at the same time, may adjust, according to the frequency offset value, a sending frequency of downlink signaling in the switching process, or may not adjust the sending frequency of downlink signaling in the switching process.
For example, if the terminal obtains an adjustment value for adjusting the receiving frequency of the downlink signaling sent from the target cell base station before sending the first signal to the target cell base station at the initial stage of handover, and adjusts the frequency of the received signal by using the adjustment value, the target cell base station only adjusts the receiving frequencies of all uplink signaling in the handover process according to the frequency offset value; if the terminal does not obtain an adjustment value for adjusting the receiving frequency of the downlink signaling sent by the target cell base station before sending the first signal to the target cell base station at the initial stage of switching, and the frequency of the received signal cannot be adjusted, the target cell base station adjusts the receiving frequencies of all uplink signaling in the switching process and simultaneously adjusts the sending frequencies of all downlink signaling in the switching process according to the frequency offset value.
For better understanding of the embodiments of the present invention, specific application scenarios are given below, and further detailed description is made for a process of improving a handover success rate (several embodiments below refer to a signaling interaction process shown in fig. 3), where a source cell base station is a, a target cell base station is B, and a terminal is C:
the first embodiment is as follows: and B, estimating a frequency offset value n1 of the frequency of the locally received signal relative to the local crystal oscillator frequency in the switching process according to the first signal sent by C, and adjusting the receiving frequency of each uplink signaling in the switching process according to n 1.
Step a 1: and B, after receiving the switching request command, allocating a channel for a terminal C switched into B, and communicating with C on the channel.
Step b 1: and B, estimating a frequency offset value n1 of the frequency of the signal received locally in the switching process relative to the frequency of the local crystal oscillator according to the first signal sent by C in the initial switching stage.
In this embodiment, B estimates a frequency offset value n1 of the frequency of the locally received signal relative to the local crystal frequency during the switching process according to the "handover" sent by C at the initial stage of switching.
Step c 1: and B, adjusting the receiving frequency of each uplink signaling in the switching process according to the frequency offset value n 1.
In this embodiment, since the C obtains the adjustment value for adjusting the receiving frequency of the downlink signaling before sending the "handover" to the target cell base station at the initial stage of handover, the C adjusts the receiving frequencies of the two uplink signaling, i.e., "SABM" and "handover", according to n1, demodulates, decodes, and outputs the two uplink signaling, i.e., "SABM" and "handover" after the adjustment of the receiving frequencies, and directly encodes and modulates the "physical signaling" and "UA" without adjusting the sending frequencies of the "physical signaling" and "UA" according to n1, and then sends the two uplink signaling and the "UA" without adjusting the sending frequencies of the "physical signaling" and "UA" according to n 1.
Example two: and B, estimating a frequency offset value n2 of the frequency of the locally received signal relative to the local crystal oscillator frequency in the switching process according to the first signal sent by C, and adjusting the receiving frequency of each uplink signaling and the sending frequency of each downlink signaling in the switching process according to n 2.
Step a 2: and B, after receiving the switching request command, allocating a channel for a terminal C switched into B, and communicating with C on the channel.
Step b 2: and B, estimating a frequency offset value n2 of the frequency of the signal received locally in the switching process relative to the frequency of the local crystal oscillator according to the first signal sent by C in the initial switching stage.
In this embodiment, B estimates a frequency offset value n2 of the frequency of the locally received signal relative to the local crystal frequency during the switching process according to the "handover" sent by C at the initial stage of switching.
Step c 2: and B, according to the frequency offset value n2, adjusting the receiving frequency of each uplink signaling and the sending frequency of each downlink signaling in the switching process.
In this embodiment, since B does not obtain an adjustment value for adjusting the receiving frequency of the downlink signaling before sending "handover" to the target cell base station at the initial stage of handover, B adjusts the receiving frequencies of the two uplink signaling, namely "SABM" and "handover", according to n2, demodulates and decodes the "SABM" and "handover" after the adjustment of the receiving frequencies, and outputs the demodulated and decoded signals, and similarly, when sending the two downlink signaling, namely "physical signaling" and "UA", B encodes and modulates the "physical signaling" and "UA", and then adjusts the sending frequencies of the two downlink signaling, namely "physical signaling" and "UA", according to n2, and sends the modulated signals.
Example three: and B, when the signaling sent by C is received every time in the switching process, estimating frequency offset values n3, n4 and n5 of the frequency of the locally received signal relative to the frequency of the local crystal oscillator in the current switching process according to the received signal every time, and adjusting the receiving frequency of the corresponding uplink signaling in the switching process according to n3, n4 and n 5.
Step a 3: and B, after receiving the switching request command, allocating a channel for a terminal C switched into B, and communicating with C on the channel.
Step b 3: and B, estimating a frequency offset value n3 of the frequency of the locally received signal relative to the local crystal oscillator frequency in the switching process according to the 'Handoveraccess' sent by C in the initial switching stage.
Step c 3: and B, according to the frequency offset value n3, adjusting the receiving frequency of the uplink signaling 'Handoveraccess' received this time in the switching process.
In this embodiment, since B obtains an adjustment value for adjusting the reception frequency of the downlink signaling before sending "handover" to the target cell base station at the initial stage of handover, B adjusts only the reception frequency of "handover" according to n3, demodulates and decodes the "handover" after the reception frequency adjustment, and then outputs the demodulated and decoded reception frequency, "physical format" without adjusting the transmission frequency of "physical format" according to n3, and directly encodes and modulates "physical format" before sending it.
Step d 3: and B, estimating a frequency offset value n4 of the frequency of the locally received signal relative to the local crystal oscillator frequency in the switching process according to the SABM sent by C in the initial stage of switching.
Step e 3: and B, according to the frequency offset value n4, adjusting the receiving frequency of the uplink signaling SABM received this time in the switching process.
In this embodiment, since B obtains an adjustment value for adjusting the receiving frequency of the downlink signaling before sending "handover" to the target cell base station at the initial stage of handover, B adjusts only the receiving frequency of "SABM" according to n4, then demodulates, decodes, and outputs the "SABM" after the adjustment of the receiving frequency, and then directly encodes and modulates "UA" without adjusting the sending frequency of "UA" according to n4 when sending "UA", and then sends the "UA".
Step f 3: and B, estimating a frequency offset value n5 of the frequency of the locally received signal relative to the local crystal oscillator frequency in the switching process according to the 'Handovertompute' sent by C in the initial switching stage.
Step g 3: and B, according to the frequency offset value n5, adjusting the receiving frequency of the uplink signaling 'Handovertompute' received this time in the switching process.
Step h 3: the handover is completed.
Example four: and B, when the signaling sent by C is received every time in the switching process, estimating frequency offset values n6, n7 and n8 of the frequency of the locally received signal relative to the frequency of the local crystal oscillator in the current switching process according to the received signal every time, and adjusting the receiving frequency of the corresponding uplink signaling and the sending frequency of the corresponding downlink signaling in the switching process according to n6, n7 and n 8.
Step a 4: and B, after receiving the switching request command, allocating a channel for a terminal C switched into B, and communicating with C on the channel.
Step b 4: and B, estimating a frequency offset value n6 of the frequency of the locally received signal relative to the local crystal oscillator frequency in the switching process according to the 'Handoveraccess' sent by C in the initial switching stage.
Step c 4: and B, according to the frequency offset value n6, adjusting the receiving frequency of the uplink signaling 'Handoveraccess' received this time in the switching process, and adjusting the sending frequency of the response signaling 'Physicalinformation' of the uplink signaling 'Handoveraccess'.
In this embodiment, since B does not obtain an adjustment value for adjusting the transmission/reception frequency of the downlink signaling before transmitting "handover" to the target cell base station at the initial stage of handover, B adjusts the reception frequency of "handover" according to n6, demodulates and decodes the "handover" after the reception frequency adjustment, and outputs the result, and then encodes and modulates "physical format" when transmitting "physical format", and then adjusts the transmission frequency of "physical format" according to n6, and then transmits the result.
Step d 4: and B, estimating a frequency offset value n7 of the frequency of the signal received locally in the switching process relative to the frequency of the local crystal oscillator according to the SABM sent by C in the switching process.
Step e 4: and B, according to the frequency offset value n7, adjusting the receiving frequency of the uplink signaling SABM received this time in the switching process, and adjusting the sending frequency of the response signaling UA of the uplink signaling SABM.
In this embodiment, since B does not acquire an adjustment value for adjusting the receiving frequency of the downlink signaling before sending "SABM" to the target cell base station at the initial stage of handover, B only adjusts the receiving frequency of "SABM" according to n7, then demodulates, decodes, and outputs the "SABM" after the adjustment of the receiving frequency, then, when sending "UA", performs coding and modulation first, then adjusts the sending frequency of "UA" according to n7, and then sends the "UA".
Step f 4: and B, estimating a frequency offset value n8 of the frequency of the locally received signal relative to the local crystal oscillator frequency in the switching process according to the 'Handovertmplete' sent by C in the switching process.
Step g 4: and B, according to the frequency offset value n8, adjusting the receiving frequency of the uplink signaling 'Handovertompute' received this time in the switching process.
Step h 4: the handover is completed.
Based on the above technical solution, referring to fig. 4, in the embodiment of the present invention, the target cell base station includes a receiving unit 40, an estimating unit 41 and an adjusting unit 42, wherein,
a receiving unit 40, configured to allocate a channel for a terminal switched from a source cell base station to the apparatus and communicate with the terminal on the channel after receiving a handover request command from the source cell base station;
an estimating unit 41, configured to estimate, according to a signal sent by the terminal, a frequency offset value of a frequency of a locally received signal relative to a local crystal frequency in a switching process;
and an adjusting unit 42, configured to adjust a receiving frequency of the uplink signaling or/and a sending frequency of the downlink signaling in the handover process according to the frequency offset value.
In the embodiment of the present invention, the estimating unit 41 is specifically configured to estimate, according to a signal sent by the terminal, a frequency offset value of a frequency of a locally received signal relative to a local crystal oscillator frequency in a switching process by using a differential algorithm; or, according to the signal sent by the terminal, estimating the frequency offset value of the frequency of the signal received locally relative to the frequency of the local crystal oscillator in the switching process by adopting an iterative algorithm.
When the estimating unit 41 estimates the frequency offset value of the frequency of the locally received signal relative to the local crystal frequency in the switching process, preferably, the frequency offset value of the frequency of the locally received signal relative to the local crystal frequency in the switching process is estimated according to the first signal sent by the terminal at the initial stage of switching; or, every time a signal sent by the terminal is received in the switching process, estimating a frequency offset value of the frequency of the locally received signal relative to the local crystal oscillator frequency in the current switching process according to the currently received signal.
When the estimating unit 41 estimates the frequency offset value of the frequency of the locally received signal relative to the local crystal oscillator frequency in the switching process according to the first signal sent by the terminal at the initial switching stage, preferably, the estimating unit estimates the frequency offset value of the frequency of the locally received signal relative to the local crystal oscillator frequency in the switching process according to the first signal sent by the terminal at any time at the initial switching stage; or estimating the frequency offset value of the frequency of the signal received locally in the switching process relative to the local crystal oscillator frequency according to all the first signals sent by the terminal in the initial switching stage.
Further, when the estimation unit 41 estimates the frequency offset value of the frequency of the locally received signal relative to the local crystal frequency in the switching process according to all the first signals sent by the terminal at the initial switching stage, the estimation unit estimates the frequency offset value of the frequency of the locally received signal relative to the local crystal frequency of the corresponding first signal in the switching process according to the first signal sent by the terminal each time at the initial switching stage, and then obtains the frequency offset value of the frequency of the locally received signal relative to the local crystal frequency in the switching process through weighting operation on all the obtained single estimated frequency offset values.
In this embodiment of the present invention, the adjusting unit 42 is specifically configured to, if the estimating unit 41 estimates, at an initial stage of switching, a frequency offset value of a frequency of a signal locally received in a switching process relative to a local crystal oscillator frequency according to a first signal sent by a terminal, the adjusting unit 42 respectively adjusts, according to the frequency offset value, a receiving frequency of each uplink signaling in the switching process, or/and a sending frequency of each downlink signaling; if the estimating unit 41 estimates, every time a signal sent by the terminal is received in the switching process, a frequency offset value of the frequency of a locally received signal in the current switching process relative to the local crystal oscillator frequency according to the currently received signal, for any estimated frequency offset value, the adjusting unit 42 adjusts, according to any estimated frequency offset value, the receiving frequency of each uplink signaling or/and the sending frequency of each downlink signaling in the current switching process from the current time to before the signal sent by the terminal is received next time.
Meanwhile, the adjusting unit 42 is further specifically configured to adjust the receiving frequency of the uplink signaling in the switching process by using an uplink radio frequency local oscillation pre-bias receiving manner, an intermediate frequency shift pre-bias manner, or a baseband frequency offset adjusting manner according to the frequency offset value; or, a downlink radio frequency local oscillation pre-bias sending mode, an intermediate frequency moving pre-bias mode or a baseband frequency offset pre-bias mode is adopted according to the frequency offset value to adjust the sending frequency of the downlink signaling in the switching process.
In this embodiment of the present invention, the adjusting unit 42 is further specifically configured to, if the terminal obtains an adjustment value for adjusting the receiving frequency of the downlink signaling before sending the first signal to the estimating unit at the initial stage of switching, adjust only the receiving frequency of the uplink signaling during the switching process by the adjusting unit 42 according to the frequency offset value; alternatively, if the terminal does not obtain the adjustment value for adjusting the receiving frequency of the downlink signaling before sending the first signal to the estimating unit in the initial stage of handover, the adjusting unit 42 adjusts the receiving frequency of the uplink signaling in the handover process and the sending frequency of the downlink signaling in the handover process according to the frequency offset value.
In summary, in the embodiment of the present invention, after receiving the handover request command from the source cell base station, the target cell base station allocates a channel for the terminal that is switched into the source cell base station from the source cell base station, and communicates with the terminal on the channel; then, the target cell base station estimates the frequency offset value of the frequency of the locally received signal relative to the local crystal oscillator frequency in the switching process according to the signal sent by the terminal, and finally, the target cell base station adjusts the receiving frequency of the uplink signaling or/and the sending frequency of the downlink signaling in the switching process according to the frequency offset value, so that when the frequencies of the target cell base station and the source cell base station are asynchronous, the receiving frequency of the uplink signaling or/and the sending frequency of the downlink signaling in the switching process are adjusted by calculating the frequency offset value of the frequency of the locally received signal relative to the local crystal oscillator frequency in the process of switching the terminal from the source cell base station to the target cell base station, thereby avoiding the problem of low switching success rate caused by the frequency offset of the source cell base station and the target cell base station in the terminal switching process in the prior art, and the complexity of the implementation process is low.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various modifications and variations can be made in the embodiments of the present invention without departing from the spirit or scope of the embodiments of the invention. Thus, if such modifications and variations of the embodiments of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to encompass such modifications and variations.
Claims (12)
1. A method for improving handover success rate, comprising:
after receiving a switching request command of a source cell base station, a target cell base station allocates a channel for a terminal switched into the cell base station by the source cell base station and communicates with the terminal on the channel;
estimating a frequency offset value of a local actual signal receiving frequency relative to a local target signal receiving frequency in a switching process according to a first signal sent by a terminal at the initial stage of switching by the target cell base station; or, the target cell base station estimates the frequency offset value of the local actual signal receiving frequency relative to the local target signal receiving frequency in the current switching process according to the received signal every time the target cell base station receives a signal sent by the terminal in the switching process;
the target cell base station adjusts the receiving frequency of the uplink signaling or/and the sending frequency of the downlink signaling in the switching process according to the frequency offset value;
the target cell base station adjusts the receiving frequency of the uplink signaling or/and the sending frequency of the downlink signaling in the switching process according to the frequency offset value, and the adjusting comprises the following steps:
if the terminal obtains an adjustment value for adjusting the receiving frequency of the downlink signaling before sending the first signal to the target cell base station at the initial switching stage, the target cell base station only adjusts the receiving frequency of the uplink signaling in the switching process according to the frequency offset value; or,
if the terminal does not acquire the adjustment value for adjusting the receiving frequency of the downlink signaling before sending the first signal to the target cell base station at the initial switching stage, the target cell base station adjusts the receiving frequency of the uplink signaling in the switching process and the sending frequency of the downlink signaling in the switching process according to the frequency offset value.
2. The method of claim 1, wherein the target cell base station estimates a frequency offset value of a frequency of a locally received signal relative to a local crystal oscillator frequency during handover according to a signal transmitted by the terminal, and the method comprises:
the target cell base station estimates the frequency offset value of the frequency of the signal received locally relative to the frequency of the local crystal oscillator in the switching process by adopting a differential algorithm according to the signal sent by the terminal; or,
and the target cell base station estimates the frequency offset value of the frequency of the signal received locally relative to the frequency of the local crystal oscillator in the switching process by adopting an iterative algorithm according to the signal sent by the terminal.
3. The method according to claim 1 or 2, wherein the target cell base station estimates, at an initial stage of handover, a frequency offset value of a frequency of a locally received signal relative to a local crystal oscillator frequency during the handover according to a first signal sent by the terminal, and the method comprises:
the target cell base station estimates the frequency offset value of the frequency of the signal received locally relative to the frequency of a local crystal oscillator in the switching process according to the first signal sent by the terminal at any time in the initial switching stage; or,
and the target cell base station estimates the frequency offset value of the frequency of the signal received locally relative to the frequency of the local crystal oscillator in the switching process according to all the first signals sent by the terminal at the initial switching stage.
4. The method of claim 3, wherein the target cell base station estimates, at an initial stage of handover, a frequency offset value of a frequency of a signal received locally in relation to a local crystal oscillator frequency according to all first signals transmitted by the terminal, and the method comprises:
the target cell base station respectively estimates the frequency offset value of the frequency of the signal received locally relative to the frequency of a local crystal oscillator in the switching process according to the first signal sent by the terminal every time in the initial switching stage;
and the target cell base station obtains the frequency offset value of the frequency of the locally received signal relative to the local crystal oscillator frequency in the switching process through weighting operation on all the obtained single estimated frequency offset values.
5. The method as claimed in claim 1 or 2, wherein when the target cell base station adjusts the receiving frequency of the uplink signaling or/and the sending frequency of the downlink signaling during the handover according to the frequency offset value, the method comprises:
if the target cell base station estimates a frequency offset value of the frequency of a signal received locally in the switching process relative to the frequency of a local crystal oscillator according to a first signal sent by the terminal at the initial switching stage, the target cell base station respectively adjusts the receiving frequency of each uplink signaling or/and the sending frequency of each downlink signaling in the switching process according to the frequency offset value;
if the target cell base station receives a signal sent by the terminal every time in the switching process, estimating a frequency offset value of the frequency of the signal received locally in the current switching process relative to the local crystal oscillator frequency according to the received signal this time, and aiming at the frequency offset value estimated at any time, the target cell base station adjusts the receiving frequency of each uplink signaling or/and the sending frequency of each downlink signaling in the current switching process from the current time to the time before the signal sent by the terminal is received next time according to the frequency offset value estimated at any time.
6. The method of claim 1 or 2, wherein the adjusting, by the target cell base station, the receiving frequency of the uplink signaling or/and the sending frequency of the downlink signaling in the handover process according to the frequency offset value comprises:
adjusting the receiving frequency of the uplink signaling in the switching process by adopting an uplink radio frequency local oscillation pre-bias receiving mode or an intermediate frequency shift pre-bias mode or a baseband frequency offset adjusting mode according to the frequency offset value; or,
and adjusting the sending frequency of the downlink signaling in the switching process by adopting a downlink radio frequency local oscillator pre-bias sending mode or an intermediate frequency moving pre-bias mode or a baseband frequency offset pre-bias mode according to the frequency offset value.
7. An apparatus for improving handover success rate, comprising:
a receiving unit, configured to allocate a channel to a terminal switched from a source cell base station to the device after receiving a handover request command from the source cell base station, and communicate with the terminal on the channel;
the estimating unit is used for estimating a frequency offset value of a local actual signal receiving frequency relative to a local target signal receiving frequency in a switching process according to a first signal sent by a terminal at the initial stage of switching; or, estimating the frequency offset value of the local actual signal receiving frequency relative to the local target signal receiving frequency in the current switching process according to the received signal every time the signal sent by the terminal is received in the switching process;
and the adjusting unit is used for adjusting the receiving frequency of the uplink signaling or/and the sending frequency of the downlink signaling in the switching process according to the frequency offset value.
8. The apparatus according to claim 7, wherein the evaluation unit is in particular adapted to,
estimating a frequency offset value of the frequency of a signal received locally relative to the frequency of a local crystal oscillator in a switching process by adopting a differential algorithm according to the signal sent by the terminal; or,
and estimating the frequency offset value of the frequency of the signal received locally relative to the frequency of the local crystal oscillator in the switching process by adopting an iterative algorithm according to the signal sent by the terminal.
9. The arrangement according to claim 7 or 8, characterized in that the evaluation unit is specifically adapted to,
estimating a frequency offset value of the frequency of a signal received locally relative to the frequency of a local crystal oscillator in the switching process according to a first signal sent by the terminal at any time in the initial switching stage; or,
and estimating the frequency offset value of the frequency of the signal received locally relative to the frequency of the local crystal oscillator in the switching process according to all the first signals sent by the terminal at the initial stage of switching.
10. The apparatus according to claim 9, wherein the evaluation unit is in particular adapted to,
when estimating the frequency offset value of the frequency of the locally received signal relative to the local crystal oscillator frequency in the switching process according to all the first signals sent by the terminal in the initial switching stage, respectively estimating the frequency offset value of the frequency of the locally received signal of the corresponding first signal relative to the local crystal oscillator frequency in the switching process according to the first signal sent by the terminal each time in the initial switching stage, and then obtaining the frequency offset value of the frequency of the locally received signal relative to the local crystal oscillator frequency in the switching process through weighting operation on all the obtained single estimated frequency offset values.
11. The device according to claim 7 or 8, characterized in that the adjustment unit is specifically adapted to,
if the estimating unit estimates a frequency offset value of the frequency of the signal received locally in the switching process relative to the local crystal oscillator frequency according to the first signal sent by the terminal at the initial switching stage, the adjusting unit respectively adjusts the receiving frequency of each uplink signaling or/and the sending frequency of each downlink signaling in the switching process according to the frequency offset value;
if the estimating unit receives a signal sent by the terminal every time in the switching process, and estimates a frequency offset value of the frequency of the locally received signal relative to the local crystal oscillator frequency in the current switching process according to the currently received signal, for any estimated frequency offset value, the adjusting unit adjusts the receiving frequency of each uplink signaling or/and the sending frequency of each downlink signaling in the current switching process from the current time to before the next signal sent by the terminal is received according to the any estimated frequency offset value.
12. The device according to claim 7 or 8, characterized in that the adjustment unit is specifically adapted to,
adjusting the receiving frequency of the uplink signaling in the switching process by adopting an uplink radio frequency local oscillation pre-bias receiving mode or an intermediate frequency shift pre-bias mode or a baseband frequency offset adjusting mode according to the frequency offset value; or,
and adjusting the sending frequency of the downlink signaling in the switching process by adopting a downlink radio frequency local oscillator pre-bias sending mode or an intermediate frequency moving pre-bias mode or a baseband frequency offset pre-bias mode according to the frequency offset value.
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| CN106134121B (en) * | 2014-03-28 | 2019-06-28 | 交互数字专利控股公司 | Half-duplex FDD WTRU with single oscillator |
| CN103945521B (en) * | 2014-04-03 | 2018-05-29 | 京信通信***（中国）有限公司 | A kind of method and device for calibrating base station crystal oscillator frequency |
| EP3248406B1 (en) * | 2015-01-23 | 2020-05-20 | Telefonaktiebolaget LM Ericsson (publ) | Method and wireless network node for matching uplink coverage area and downlink coverage area |
| CN106330803B (en) * | 2015-06-30 | 2019-09-24 | 展讯通信（上海）有限公司 | Terminal pattern switching method and terminal |
| CN106454972B (en) * | 2015-08-10 | 2020-04-10 | ***通信集团公司 | Method and device for switching signals between same physical frequency points and different frequency point numbers |
| CN108377543B (en) * | 2018-01-09 | 2021-01-08 | 北京智联安科技有限公司 | NBIoT terminal clock synchronization method and device |
| CN108601044B (en) * | 2018-06-01 | 2021-09-17 | Oppo广东移动通信有限公司 | Network type switching method and device, storage medium and mobile terminal |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1471252A (en) * | 2002-07-26 | 2004-01-28 | 华为技术有限公司 | Frequency deviation correction method for base station received signal and Rake receiver |
| CN1585289A (en) * | 2004-06-02 | 2005-02-23 | 中兴通讯股份有限公司 | Method for compensating frequency offset in wireless mobile communication system |
| CN102131219A (en) * | 2011-04-08 | 2011-07-20 | 西安电子科技大学 | Mobile communication 3G/4G (third generation/fourth generation) electric wave propagation loss NPL (noise-pollution level) model under shade of street trees and network optimization method |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9148181B2 (en) * | 2006-06-09 | 2015-09-29 | Texas Instruments Incorporated | Reference clock compensation in DVB-H receivers |
| CN101567708B (en) * | 2008-04-22 | 2013-01-09 | 中兴通讯股份有限公司 | Frequency offset compensation method and device |
| CN101594179A (en) * | 2008-05-29 | 2009-12-02 | ***通信集团上海有限公司 | A kind of method of compensate of frequency deviation, Apparatus and system |
| CN101958744B (en) * | 2009-07-13 | 2013-11-20 | 电信科学技术研究院 | Method and device for pre-calibrating frequency deviation |
-
2013
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1471252A (en) * | 2002-07-26 | 2004-01-28 | 华为技术有限公司 | Frequency deviation correction method for base station received signal and Rake receiver |
| CN1585289A (en) * | 2004-06-02 | 2005-02-23 | 中兴通讯股份有限公司 | Method for compensating frequency offset in wireless mobile communication system |
| CN102131219A (en) * | 2011-04-08 | 2011-07-20 | 西安电子科技大学 | Mobile communication 3G/4G (third generation/fourth generation) electric wave propagation loss NPL (noise-pollution level) model under shade of street trees and network optimization method |
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Address after: 510663 No. 10 Shenzhou Road, Guangzhou Science City, Guangdong Province Patentee after: Jingxin Network System Co.,Ltd. Address before: 510663 No. 10 Shenzhou Road, Guangzhou Science City, Guangdong Province Patentee before: COMBA TELECOM SYSTEMS (CHINA) Ltd. |
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