CN1242678A - Terminal control device and method for soft-handoff between terminals having different frequencies - Google Patents
Terminal control device and method for soft-handoff between terminals having different frequencies Download PDFInfo
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- CN1242678A CN1242678A CN 98116382 CN98116382A CN1242678A CN 1242678 A CN1242678 A CN 1242678A CN 98116382 CN98116382 CN 98116382 CN 98116382 A CN98116382 A CN 98116382A CN 1242678 A CN1242678 A CN 1242678A
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- base station
- local oscillator
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Abstract
It includes a RAKE receiver having main path (1) and an extra path (2), a 1st local oscillator (1LO) for (1) and 2nd one for (2). When the portable terminal is located between the base station using the different frequencies, both oscillators are enabled. Thereofter, as the portable terminal moves into coverage of a target base station, it changes an oscillation frequency of (1LO) for a frequency of the target base station and communicates with the target base station using a demodulation signal output from the (2). Upon stabilization of the (1LO) the portable terminal disables the (2) and communicates with the target base station using modulation signals output from (1).
Description
The present invention relates to the switching in the call handling process in the CDMA terminal, be specifically related to be used to be controlled at the method and apparatus of soft handover between the base station of adopting different frequency.
Switching during the conversation be divided into from source base station to switch between the station the purpose base station and same base station in the station in switch.Switching between the base station is very important for keeping the continuity of calling out in the mobile communication.Traditional AMPS (advanced mobile telephone service) does not support soft handover, and this will make hand-held terminal cause when move on the border of adjacent base station to call out cuts off.Same cdma system is not supported in the soft handover between the base station with different frequency, and the result causes to call out and cuts off.Calling in the communication process is cut off or clatter causes that the user is discontented.In addition, when the CDMA terminal provided data communication service, the calling in the data transmission procedure was cut off and can be caused loss of transmitted data.Therefore the user can not use the CDMA hand-held terminal to send data.
Fig. 1 is the figure that is used to illustrate switch instances.In the drawings, reference character A, B, C represents adjacent base station, reference character f1, f2, f3 are illustrated in corresponding base station A, used frequency among B and the C.Frequency and the base station communication under it that A hand-held terminal PT is assigned with by use.Simultaneously, when in the coverage of hand-held terminal PT at another adjacent base station when mobile, it should be tuned to the frequency of new base station.
Fig. 2 represents the block diagram of traditional CDMA terminal.As shown, first local oscillator, 13 generation first local oscillated signals and first frequency mixer 12 mix the RF signal and first local oscillated signal that receives from antenna 11.Second local oscillator 16 produces the signal output and second local oscillated signal of second local oscillated signal and second frequency mixer, 15 mixing, first frequency mixer 12.Rake receiver 30 comprises mulitpath 18-21, every output signal that receives second frequency mixer 15, and combiner 23 provides signal from path 18-21 to output node independently.Decoder 24 decodings are from the signal output of combiner 23.Controller 40 produces signal, is used to control the frequency of oscillation of first and second local oscillators 13 and 16, the connection between control path 18-21 and the combiner 23, the operation of control decoder 24.As shown in FIG., path 18-21 comprises finger, and the signal that offers corresponding finger 18-21 has concrete time difference each other.
With reference to Fig. 1 and 2 handover operation is described.When the base station A that uses same frequency f 1 has identical vertical shift with B, carry out soft handover.Yet between base station A that uses different frequency f1 and f2 and C or between base station B and the C, the frequency of occurrences is switched, and often causes to call out and cuts off.Belong to the public domain of the overlay area of the base station A that uses different frequency f 1 and f2 and C by the region representation of 1. expression, so that 1. the public domain has frequency f 1 and f2.Yet traditional mobile phone of Fig. 2 has single local oscillator 13, can not support two frequency f 1 and f2.In other words, when the RF conversion of signals that will receive from the base station when traditional terminal was baseband signal, it can only handle a signal that receives from the base station with different frequency.
Therefore, the purpose of this invention is to provide a kind of equipment and method, be used to support to adopt the soft handover between the base station of different frequency.
In order to realize above purpose, provide a kind of and be used to control hand-held terminal and have the equipment that carries out soft handover between the base station of different frequency.Equipment comprises: first local oscillator is used to produce first local oscillated signal; First frequency mixer is used to mix the RF signal and first local oscillated signal that receives by antenna; Second local oscillator is used to produce second local oscillated signal; Second frequency mixer is used to mix the signal output and second local oscillated signal of first frequency mixer; The 3rd local oscillator is used to produce the 3rd local oscillated signal; Three-mixer is used for blended RF signal and the 3rd local oscillated signal; The 4th frequency mixer is used to mix the output signal and second local oscillated signal of three-mixer; A Rake receiver comprises many main paths of the output signal that each receives second frequency mixer,, an extra path, receive output signal and a combiner of the 4th frequency mixer, be used for providing from the signal of main path and extra path to output node independently importing; A decoder, the signal that is used to decode from combiner is exported; With a controller, be used for when hand-held terminal is between the base station of employing different frequency, enable extra path, change the frequency of oscillation of described first local oscillator that is used for a purpose base station frequency, and when hand-held terminal moves in the coverage of described purpose base station, command combiner receives the restituted signal output of described extra path, and when first local oscillator is stablized, forbids that extra path and command combiner receive the restituted signal output of main path.
By detailed description below in conjunction with accompanying drawing, above and other purpose of the present invention, feature and benefit will be more obvious.
Fig. 1 is the figure of an explanation switch instances;
Fig. 2 is the block diagram of a traditional CDMA terminal;
Fig. 3 is the block diagram of CDMA terminal according to an embodiment of the invention;
Fig. 4 A is the figure of the traditional switching of explanation; With
Fig. 4 B is the figure of explanation according to the soft handover of the embodiment of the invention.
Describe the preferred embodiments of the present invention below with reference to the accompanying drawings, wherein identical reference number is represented the parts that structure is identical or suitable.In the following description, various details have been provided with complete understanding the present invention.Yet one of ordinary skill in the art need not these details also can realize the present invention obviously.In other example, known function and structure are not described, so that can not make the present invention more complicated.
Fig. 3 represents the block diagram according to the CDMA terminal of the embodiment of the invention.As shown in the figure, first local oscillator 13 produces first local oscillated signal, and first frequency mixer 12 mixes the RF signal and first local oscillated signal that receives by antenna 11.Second local oscillator 16 produces second local oscillated signal, and second frequency mixer 15 mixes the output signal and second local oscillated signal of first frequency mixer 12.Three-mixer 25 produces the 3rd local oscillating frequency, and three-mixer 14 mixes RF signal and the 3rd local oscillated signal that receives by antenna 11.The 4th frequency mixer 17 mixes the output signal and second local oscillated signal of three-mixer 14.Rake receiver 30 ' comprises many every main path (promptly referring to 18-21) that receives the output signal of second frequency mixer 15, receive the extra path (promptly referring to 22) of the output signal of the 4th frequency mixer 17, combiner 23 is used for providing from the signal input that refers to 18-22 to output node independently.Decoder 24 decodings are from the signal output of combiner 23.Controller 40 produces the frequency of oscillation that signal is used to control first to the 3rd local oscillator 13,16 and 25, and control refers to the connection between 18-22 and the combiner 23, and the operation of control decoder 24.
To handover operation be described with reference to figure 1 and 3.When the base station A that uses same frequency f 1 has identical vertical shift with B, carry out soft handover.At this moment, extra finger 22 is under an embargo, and terminal is used and referred to 18-21 and base station communication.Yet when terminal is being used different frequency f1, when mobile, its uses supernumerary finger 22 to switch between the base station A of f2 and the border of B or between the border of base station B and C.When terminal by by the 1. expression among Fig. 1 regional the time, wherein mixing ground, to have frequency f 1 and f2, first local oscillator 13 be that frequency f 1 produces first local oscillated signal, the 3rd local oscillator 25 is frequency f 2 generations the 3rd local oscillated signals.First local oscillated signal of first local oscillator, 13 outputs and the RF signal mixing of reception, and be provided for finger 18-21, and the 3rd local oscillated signal of the 3rd local oscillator 25 outputs and the RF signal mixing of reception, and offer supernumerary finger 22.When handling at the same time from signal that two base stations with different frequency receive, when if hand-held terminal PT moves to the overlay area of adjacent base station C, it uses from the restituted signal output of supernumerary finger 22 and communicates by letter with base station C, till the frequency of first local oscillator 13 is changed and is stabilized in frequency f 2.After first local oscillator 13 was stablized, hand-held terminal PT forbade supernumerary finger 22.
Unexpected frequency when Fig. 4 A is illustrated in traditional terminal PT through the border of the base station of adopting different frequency is switched.Unexpected frequency switching may cause to call out to be cut off.Soft frequency when on the contrary, Fig. 4 B is illustrated in according to terminal according to the present invention through the border of the base station of adopting different frequency is switched.
By this way, terminal of the present invention can support to use the soft handover between the base station of different frequency, thereby improves the stability of calling out.Therefore, terminal of the present invention is applicable to the data communication service that requires conversation continuous.
Although described the present invention with reference to concrete preferred embodiment, one of ordinary skill in the art should be appreciated that under the prerequisite that does not deviate from the described spirit and scope of claim can carry out various modification.
Claims (2)
1. be used to control hand-held terminal and have the equipment that carries out soft handover between the base station of different frequency, comprising:
First local oscillator is used to produce first local oscillated signal;
First frequency mixer is used to mix the RF signal and first local oscillated signal that receives by antenna;
Second local oscillator is used to produce second local oscillated signal;
Second frequency mixer is used to mix the signal output and described second local oscillated signal of first frequency mixer;
The 3rd local oscillator is used to produce the 3rd local oscillated signal;
Three-mixer is used to mix described RF signal and described the 3rd local oscillated signal;
The 4th frequency mixer is used to mix the output signal and described second local oscillated signal of described three-mixer;
A Rake receiver comprises many main paths of the output signal that each receives described second frequency mixer,, an extra path, receive the output signal of described the 4th frequency mixer, with a combiner, be used for providing from the signal of described main path and described extra path to output node independently importing;
A decoder, the signal that is used to decode from described combiner is exported; With
A controller, be used for when hand-held terminal is between the base station of employing different frequency, enable described extra path, change the frequency of oscillation of described first local oscillator that is used for a purpose base station frequency, and when hand-held terminal moves in the coverage of described purpose base station, order described combiner to receive the restituted signal output of described extra path, and when described first local oscillator is stablized, forbid described extra path and order described combiner to receive the restituted signal output of described main path.
2. be used to control hand-held terminal carries out soft handover between the base station of using different frequency method, described hand-held terminal includes the Rake receiver of a main path and an extra path, be used for first local oscillator and second local oscillator that is used for described extra path of described main path, described method comprises step:
When adopting between the described base station of different frequency, enable described first and described second local oscillator at hand-held terminal;
When hand-held terminal moves to the overlay area of described target BS, be the frequency of oscillation of described first local oscillator of the frequency shift of target BS, and use from the restituted signal of described extra path and communicate by letter with described target BS; With
And when described first local oscillator is stablized, forbid described extra path and adopt communicating by letter with described target BS from the modulation signal of described main path.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98116382 CN1106774C (en) | 1998-07-22 | 1998-07-22 | Terminal control device and method for soft-handoff between terminals having different frequencies |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98116382 CN1106774C (en) | 1998-07-22 | 1998-07-22 | Terminal control device and method for soft-handoff between terminals having different frequencies |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1242678A true CN1242678A (en) | 2000-01-26 |
| CN1106774C CN1106774C (en) | 2003-04-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 98116382 Expired - Fee Related CN1106774C (en) | 1998-07-22 | 1998-07-22 | Terminal control device and method for soft-handoff between terminals having different frequencies |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1106774C (en) |
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1998
- 1998-07-22 CN CN 98116382 patent/CN1106774C/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| CN1106774C (en) | 2003-04-23 |
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Granted publication date: 20030423 Termination date: 20160722 |