CN100455101C - Method and system for preventing call drop by restricting overhead message updated in 1X system during 1XEV-DO traffic state - Google Patents
Method and system for preventing call drop by restricting overhead message updated in 1X system during 1XEV-DO traffic state Download PDFInfo
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Abstract
The present invention relates to a method and system for preventing a call drop by limiting a search time of a 1X system while in traffic with a 1xEV-DO system. The system comprises: a hybrid access terminal, supporting both a 1xEV-DO system and a 1X system, for periodically switching over to the 1X system and receiving an overhead message while in traffic with the 1xEV-DO system, and switching back to the 1xEV-DO system upon receiving a prescribed overhead message a base station transceiver subsystem for exchanging a voice data or a packet data with the hybrid access terminal a mobile switching center for providing a communication path for the hybrid access terminal; and a packet data serving node connected to the 1xEV-DO controller for exchanging the packet data with the 1xEV-DO system.
Description
Technical field
The present invention relates to a kind of method and system that is used for preventing call drop by the quantity that restriction during the 1xEV-DO talking state switches to the overhead messaging that the hybrid access terminal (HAT) of 1X pattern upgrades, more particularly, relate to a kind of can the regulation and the hybrid access terminal of 1xEV-DO system conversation overhead messaging in the 1X system that a preset time upgraded in the cycle, if and hybrid access terminal only receives the overhead messaging with stated type and quantity, so by allowing hybrid access terminal to automatically return to the method and system that the 1xEV-DO pattern prevents that hybrid access terminal from cancelling from the 1xEV-DO system calling.
Background technology
Mobile communication system has developed into second generation honeycomb/personal communication service system from the analog Advanced Mobile Phone System of the first generation (AMPS).Recently, developed international mobile telecommunication-2000 (IMT-2000) system, and be widely used as third generation high-rate data communication systems.
3GPP2 (third generation partner program 2) as cooperation international standard group provides the standard of CDMAIMT-2000 system for the IMT-2000 system, so that the multimedia mobile communication service is provided.According to above-mentioned standard, decision will be based on the high-speed grouped data system of the HDR (high data rate) of Qualcom company (Qualcom Incorporated) suggestion as the international standard high-speed grouped data system, and is referred to as " 1xEV (evolution: evolve) ".(data optimized or data only: data-optimized or have only data) system from CDMA 20001X system upgrade to CDMA 20001xEV-DO, and be designed for and only send data.
In the following description, for the facility that illustrates, abbreviate CDMA 20001X system as " 1X system ", and abbreviate CDMA 20001xEV-DO system as " 1xEV-DO system ".
The 1X system uses circuit network and Packet Based Network, and maximum transfer rate is provided is the high data rate service of 307.2kbp.On the contrary, the 1xEV-DO system-specific is in grouped data with maximum transfer rate is provided is the high data rate service of 2.4Mbp.
Current, 1xEV-DO system and the 1X system of habitually practising together use.That is, 1xEV-DO system and habitual 1X system all are installed in the wireless base station or in the base station controller, although they are separate operations.That is to say that the transceiver of wireless base station comprises the channel card that is used for the 1xEV-DO system and is used for the channel card of 1X system.In addition, base station controller comprises the data processing plate that is used to handle the grouped data that sends from 1xEV-DO and is used to handle the data processing plate of the data that send from 1X.
High data rate sends to mobile communication terminal by the 1xEV-DO system from the mobile communication system such as wireless base station or base station controller.In addition, voice signal or low-rate data send to communication terminal by the 1X system.
The hybrid access terminal that can receive the communication service that sends from the mobile communication system with 1xEV-DO and 1X system can periodically be monitored 1xEV-DO and the 1X system each with the preset time cycle.That is, hybrid access terminal periodically and alternately search for 1xEV-DO and 1X system, when hybrid access terminal and 1xEV-DO system communication, is periodically searched for the 1X system in its idle pulley.
More particularly, response periodically inserts the 1X system with hybrid access terminal in the 1xEV-DO system communication and upgrades such as system message or insert system resource the message, so that may send to the low speed call signal such as voice call received signal and short message of hybrid access terminal from the 1X system.
But, even hybrid access terminal with 1xEV-DO system communication, whenever hybrid access terminal periodically inserts the 1X system, hybrid access terminal just must rest in the 1X system, is upgraded fully up to system resource.
In addition, when hybrid access terminal with 1xEV-DO system communication the time, if at preset time in the cycle (for example, 5.12 seconds), the 1xEV-DO system does not receive the signal from hybrid access terminal, the 1xEV-DO system can carry out call drop operation so.In other words, no matter its reason how, if do not detect the signal from hybrid access terminal in the 1xEV-DO system predetermined time cycle, the 1xEV-DO system then carries out the call drop operation of relevant hybrid access terminal so, so that effectively utilize system resource.
But the 1xEV-DO system of current use has the structure that the reason of call drop operation is not provided to the user.That is to say, the 1xEV-DO system does not provide the information that makes the user can find the accurate reason of call drop operation to the user, even call drop operation may occur under the various situation, for example, when when the 1xEV-DO system calls out the hybrid access terminal that is connected and moves to electronic wave shadow zone, when the communication system misoperation, or when hybrid access terminal switches to the 1X system.
Summary of the invention
Therefore, be to consider that the problems referred to above have made the present invention, the purpose of this invention is to provide a kind of overhead messaging that can stipulate the 1X system that upgrades in the hybrid access terminal predetermined time cycle with 1xEV-DO system communication, if and can when hybrid system only receives the overhead messaging of the type of regulation or quantity, automatically return to the method and system that the 1xEV-DO pattern prevents that hybrid access terminal from cancelling from the 1xEV-DO system calling by allowing hybrid access terminal.
In order to reach this purpose, according to an aspect of the present invention, a kind of overhead messaging that is used for when being limited in hybrid access terminal with 1xEV-DO system communication and periodically switching to CDMA 20001X pattern is provided, prevent the system of the call drop between hybrid access terminal and CDMA 20001xEV-DO (evolution data of the optimization) system, this system comprises: hybrid access terminal, the 1X pattern that receives voice signal transmission service or low-rate data transmission service from the 1X system, operate, with receive the 1xEV-DO pattern that high data rate sends service from the 1xEV-DO system, operating, periodically switch to the 1X pattern with the hybrid access terminal of 1xEV-DO system communication, so that reception overhead messaging, if and received predetermined basic overhead messaging, would turn back to the 1xEV-DO pattern; BTS under CROS environment, comprise be used for to/from the 1xEV-DO access network transceiver of hybrid access terminal transmission/receiving block data and be used for to/from the 1X transceiver of hybrid access terminal transmission/reception speech or data; Base station controller comprises that the grouped data that is used to control 1xEV-DO access network transceiver sends the 1xEV-DO access network controller of service and is used to control the 1X controller of the transmission service of 1X transceiver; And packet data serving node (PDSN), be connected to the 1xEV-DO access network controller, so that hybrid access terminal to/from 1xEV-DO system transmission/receiving block data, wherein said overhead messaging comprises system parameters message, access parameter messages, Extended System Parameters Message, neighbor list parameter message and channel list parameter message, and wherein said predetermined basic overhead messaging comprises system parameters message and access parameter messages.
In order to reach this purpose, according to another aspect of the present invention, a kind of method is provided, be used for by being limited in and the hybrid access terminal of the 1xEV-DO system communication overhead messaging when periodically being switched to CDMA 20001X pattern prevents call drop between hybrid access terminal and CDMA20001xEV-DO (evolution data of the optimization) system, the method comprising the steps of: (a) so that hybrid access terminal rests on the 1X pattern of the mode initialization hybrid access terminal of idle condition, utilize so that the 1xEV-DO pattern that the system parameters that hybrid access terminal obtains when resting on the mode initialization 1X pattern of idle condition is come the initialization hybrid access terminal; (b) rest under the state of idle condition at hybrid access terminal, utilize hybrid access terminal to carry out double monitoring at 1X pattern and 1xEV-DO pattern; (c) allow hybrid access terminal to enter the service condition of 1xEV-DO pattern, make between hybrid access terminal and 1xEV-DO system, to set up to be connected and to converse, thus make hybrid access terminal can to/from 1xEV-DO system transmission/receiving block data; (d) if passed through predetermined monitoring time, hybrid access terminal is switched to the 1X pattern; (e) make hybrid access terminal receive overhead messaging; If (f) hybrid access terminal receives all predetermined basic overhead messagings, then allow hybrid access terminal to turn back to the 1xEV-DO pattern.
In order to reach this purpose, according to another aspect of the invention, a kind of hybrid access terminal is provided, if the overhead messaging that wherein receives by inspection after switching to the 1X pattern has satisfied predetermined condition, described hybrid access terminal then returns the 1xEV-DO pattern, described hybrid access terminal comprises: timer is used for checking whether passed through predetermined monitoring time, so that periodically search for the 1X system; Searcher module is used for following the tracks of and inversion frequency, so that carry out the switching of hybrid access terminal between 1X pattern and 1xEV-DO pattern in hardware, and receives overhead messaging; Finger module is used for the overhead messaging that demodulation receives by searcher module; With the mobile station modems chip, be used for by the switching of software control hybrid access terminal between 1X pattern and 1xEV-DO pattern, transmission/the reception of the data between control hybrid access terminal and 1X system and the 1xEV-DO system, if with when hybrid access terminal has been switched to the 1X pattern, to receive predetermined basic overhead messaging, hybrid access terminal then turns back to the mode of 1xEV-DO pattern and controls hybrid access terminal.
Description of drawings
By detailed description below in conjunction with accompanying drawing, can more clearly understand above-mentioned and other purposes of the present invention, feature and advantage, wherein:
Fig. 1 shows according to an example embodiment of the present invention, is used for being in the schematic block diagram that overhead messaging that the hybrid access terminal of 1X pattern upgrades reduces the system of call drop by restriction;
Fig. 2 A and 2B show the block diagram of channel architecture be used for by 1xEV-DO access network transceiver subsystem data being sent to the forward link of hybrid access terminal;
Fig. 3 shows the block diagram of channel architecture be used for data are sent to from hybrid access terminal the reverse link of 1xEV-DO system; With
Fig. 4 shows according to an example embodiment of the present invention, reduces the flow chart of the process of call drop by the overhead messaging that limits the hybrid access terminal renewal that switches to the 1X pattern in the 1xEV-DO communications status.
Embodiment
Now in detail with reference to the preferred embodiments of the present invention.
Below of the present invention, in the explanation, no longer known function and configuration are described in detail, because that will make technical theme of the present invention become unclear.
Fig. 1 shows example embodiment according to the present invention, is used for being in the schematic block diagram that overhead messaging that the hybrid access terminal of 1X pattern upgrades reduces the system of call drop by restriction.
As shown in Figure 1, system 100 of the present invention comprise 1xEV-DO system and 1X system the two.That is, system 100 has and communicates with hybrid access terminal 110 and be to be made of so that send the 1X system of speech and data 1X transceiver 122,1X controller 132 and mobile switching centre (MSC) 140.In addition, system 100 has and communicates with hybrid access terminal 110 and be to be made of so that only send the 1xEV-DO system of data 1xEV-DO access network transceiver subsystem (ANTS) 134,1xEV-DO access network controller (ANC) 134, packet data serving node (being designated hereinafter simply as PDSN) 150 and Internet protocol (IP) network.
Switching between 1xEV-DO system and the 1X system and to return function be to rely on the software control be stored in mobile station modems (MSM) chip, mobile station modems (MSM) chip is a kind of baseband modem chip that is contained in the hybrid access terminal 110.In addition, switching and return function is that the frequency of utilizing the searcher that is connected to the MSM chip to follow the tracks of each network is finished.In other words, when hybrid access terminal 110 during from the 1xEV-DO mode switch to the 1X pattern, searcher module is followed the tracks of the frequency of 1X system under the control of MSM chip.In addition, when hybrid access terminal 110 when the 1X pattern turns back to the 1xEV-DO pattern, the frequency of searcher module tracks 1xEV-DO system.
When hybrid access terminal 110 when the 1xEV-DO pattern receives data from the 1xEV-DO system because hybrid access terminal 110 receives high data rate with the 1xEV-DO pattern, therefore, can receive lot of data in the hybrid access terminal 110.Therefore, under the situation of the forward link that sends data from access network (AN) to hybrid access terminal 110, the channel of cutting apart by CDMA (code division multiple access) method can send data by time slot, and time slot is cut apart by TDM (time division multiplexing) method.On the contrary, under the situation of the reverse link that sends data from hybrid access terminal 110 to 1xEV-DO access network transceiver subsystem 124 and 1xEV-DO access network controller 134, data send by the CDMA method commonly used that is used for a plurality of users.
In addition, receive the hybrid access terminal 110 of data, periodically switch to the 1X pattern with the preset time cycle,, and turn back to the 1xEV-DO pattern so that whether check by the 1X system and receive signal such as voice signal with the 1xEV-DO communication pattern.At this moment, switched to the overhead messaging that hybrid access terminal 110 receives and renewal transmits from the 1X system of 1X pattern, so that carry out the voice call and the location registers of 1X system.
Here, receive and the overhead messaging that upgrades comprises by the hybrid access terminal under the 1X pattern 110, system parameters message, access parameter messages, Extended System Parameters Message, neighbor list parameter message, and channel list parameter message, or the like.
System parameters message comprises, the required network ID (NID) of receipt of call, SCI (time slot loop index), packet zone ID, or the like.Access parameter messages comprises that hybrid access terminal 110 is in order to insert the required information of 1X system from the 1xEV-DO system.Extended System Parameters Message comprises the system parameters that increases during to the 1X system when IS (tentative standard)-95B system update.In addition, neighbor list parameter message comprises, the information of the unit ID of the relevant neighbours unit that is positioned at unit wherein in abutting connection with hybrid access terminal 110.Channel list parameter message comprises, the relevant information that allows the channel of hybrid access terminal 110 transmission/reception data or speech after hybrid access terminal 110 has been set up calling.
That is to say that the hybrid access terminal from the 1xEV-DO mode switch to the 1X pattern 110 rests on the 1X pattern, up to having upgraded above-mentioned all overhead messagings.If hybrid access terminal 110 (for example 5.12 seconds) does not within the predetermined time respond pilot channel, so the 1xEV-DO system that communicates by letter with hybrid access terminal 110 cancels the calling of 1xEV-DO system and hybrid access terminal 110 foundation.
Therefore, according to spirit of the present invention, if in order to respond the call request of 1X system, hybrid access terminal 110 only receives the overhead messaging of being scheduled to required minimum, rather than receiving all overhead messagings, hybrid access terminal 110 can turn back to the 1xEV-DO pattern so.Therefore, hybrid access terminal 110 has prevented the call drop that the 1xEV-DO system carries out.That is to say that the information stores that hybrid access terminal 110 turns back to the required relevant overhead messaging substantially of 1xEV-DO pattern to " switchings " state that is switched to the 1X pattern from hybrid access terminal 110 is within it the memory.
More particularly, force hybrid access terminal 110 to turn back to the 1xEV-DO pattern by the MSM chip, searcher module and the finger module that are contained in the hybrid access terminal 110 from the 1X pattern.The MSM chip has the function of handling and being controlled at the various operations that take place in the hybrid access terminal 110.In addition, the various data of MSM chip controls transmission/reception or I/O between the user of the value of input its speech or keyboard button and hybrid access terminal 110,1xEV-DO system or 1X system.In addition, the MSM chip comprises CPU (CPU) and is used for the vocoder of coded speech.
Therefore, when hybrid access terminal 110 during, MSM chip utilization software wherein,, carry out the monitoring operation of relevant 1X system with the periodic time interval with 1xEV-DO system communication.This monitoring operation is finished by searcher module.That is, searcher module by follow the tracks of the frequency of 1X system at interval with preset time, is carried out the monitoring operation under the control of MSM chip.
The overhead messaging that receives during meanwhile, searcher module monitors 1X system is sent to the MSM chip.The MSM chip sends to finger module to the overhead messaging that receives from searcher module.The finger module that receives overhead messaging from the MSM chip is utilized CDMA demodulation method demodulation overhead messaging.In addition, the TDMA demodulation method is used for the modulating data or the modulation signal that receive when the searcher module monitors 1xEV-DO system.
The MSM chip that receives the demodulation overhead messaging from finger module determines whether to receive a tabulation that is stored in basic overhead messaging wherein.The tabulation of basic overhead messaging according to an embodiment of the invention comprises system parameters message and the connecting system parameter message that the calling of the response 1X system in the above-mentioned various overhead messaging is required.Except basic overhead messaging, also the one or more overhead messaging in the overhead messaging can be added in the tabulation of basic overhead messaging.
At this moment, if the MSM chip has determined to receive all predetermined basic overhead messagings, except basic overhead messaging, no matter the MSM chip is the overhead messaging that receives, directly turn back to the 1xEV-DO system, thereby prevented the call drop between hybrid access terminal 110 and the 1xEV-DO system from the 1X system.
Here, after hybrid access terminal 110 switched to the 1X pattern, hybrid access terminal 110 is received hybrid access terminal 110 and the overhead messaging of demodulation is stored in its memory.Therefore, when hybrid access terminal 110 turns back to the 1xEV-DO pattern, so that carry out operation with 1xEV-DO system communication, and preset time (for example in the past, 5.12 second) when switching to the 1X system more afterwards, hybrid access terminal 110 can the multiplexing overhead messaging that obtained by former 1X systematic search operation.That is to say that if hybrid access terminal 110 only receives all the other overhead messagings except the basic overhead messaging that obtained by former 1X systematic search operation, hybrid access terminal 110 can be carried out the call treatment in the 1X system so.
With mode same as described above, will be limited in the preset range of basic overhead messaging by the overhead messaging that hybrid access terminal 110 upgrades, thereby make hybrid access terminal 110 can in the 1X system, stop the short as far as possible time cycle.Therefore, can reduce the possibility of call drop amount of state and call drop between hybrid access terminal 110 and the 1xEV-DO system.
In addition, mobile switching centre 140 is by the home location register (after this abbreviating " HLR " as) 132 from the database of information of the hybrid access terminal that is registered in mobile switching centre 140 as storage, visitor location register's (after this abbreviating " VLR " as) with hybrid access terminal 110 database of information that are arranged in VLR 134 as storage, obtain the profile information (profi1e information) of hybrid terminal 110, and the call signal of process user.Here, profile information comprises mobile logo number (MIN), Electronic Serial Number (ESN), and supplemental services.
1xEV-DO system as the High Rate Packet Data system is connected to PDSN150 according to TCP/IP, so that with the form of IP grouping, to/send/receive various data from IP network 160.In addition, the time slot of 1xEV-DO system by cutting apart with the TDM method sends grouped data from IP network 160 receiving block datas with to hybrid access terminal 110.In addition, the 1xEV-DO system utilizes the CDMA data to set up grouped data, and grouped data is sent to PDSN 150 from the CDMA data that hybrid access terminal 110 receives by the modulation of CDMA method.
Under the situation of forward link, 1xEV-DO sends data with its maximum power when the hard handoff handoff functionality only is provided, and does not use the power control of wireless base station.But, under the situation of reverse link, when soft hand-off functionality and hard handoff handoff functionality are provided, in each terminal, carry out power control.
Fig. 2 A and 2B show to be used for by the block diagram of 1xEV-DO Access Network transceiver subsystem to the channel architecture of the forward link of hybrid access terminal 110 transmission data.
As shown in Fig. 2 A, forward link comprises pilot channel, medium access control (MAC) channel, control channel, and Traffic Channel.Provide pilot channel with pilot signal transmitted, be used to make the 1xEV-DO system can follow the tracks of hybrid access terminal 110.Hybrid access terminal 110 receives at least one pilot signal by pilot channel, and inserts the wireless base station that has sent the pilot signal with maximum intensity.In addition, the reference of the coherent detection that pilot channel is carried out as the wireless base station that relies on 110 pairs of hybrid access terminals to have the 1xEV-DO system.
The MAC channel is mainly used in the control reverse link, and comprises reverse activity (RA) channel, and reverse power control (RPC) channel.Here, the RA channel is used for determining the transmission rate of reverse link.In addition, the RA channel can be used for channel at reverse link when saturated, and request hybrid access terminal 110 reduces transmission rates.In addition, the RPC channel is used for when hybrid access terminal 110 sends signal or data by reverse link, the control transmitted power.
Control channel is used for sending broadcast from the 1xEV-DO system to hybrid access terminal 110, or is used to send direct message, so that directly control specific hybrid access terminal.When the 1xEV-DO system when hybrid access terminal 110 only sends grouped data, use Traffic Channel.
Below with reference to structure of time slot and the data structure in Fig. 2 B explanation forward link.At first, forward link comprises 16 time slots of each frame, and every frame has the time interval of about 26.67ms.In addition, half period of each time slot comprises 1024 chips, half period comprises 1024 chips in the back, that is, and and 2048 chips altogether.In addition, given each time slot allocation the time interval of 1.67ms.
More particularly, each in half time slot of half time slot and back comprises the data period of one 400 chip, the MAC period of one 64 chip, the pilot tone period of one 96 chip, the MAC period of one 64 chip and the data period of one 400 chip.
Fig. 3 shows from the block diagram of hybrid access terminal 110 to the channel architecture of the reverse link of 1xEV-DO system transmission data.
Reverse link shown in Fig. 3 can use the CDMA method in the mode identical with the 1X system, and mainly comprises access channel and Traffic Channel.Access channel has pilot channel and data channel, and Traffic Channel has pilot channel, MAC channel, Ack channel, and data channel.Here, the MAC channel is divided into reverse rate indicator (RRI) channel and a data rate controlled (DRC) channel once more.
Access channel is used for sending start connection _ request (origination connection_request) message and registration route _ renewal (registration route_update) message.Access channel has the low transmission rate of 9.6kbps at the stability of wireless channel.
The same with the pilot channel in the forward link shown in Fig. 2 A, the reference of the coherent detection that the pilot channel shown in Fig. 3 carries out as the wireless base station that relies on 110 pairs of hybrid access terminals to have the 1xEV-DO system.Data channel is used to send hybrid access terminal 110 and inserts the required data of 1xEV-DO system.
Traffic Channel is used when the 1xEV-DO system sends grouped data at hybrid access terminal 110.Traffic Channel provides various message transmission rate according to wireless communications environment.
Pilot channel is carried out the function identical functions with pilot channel, and this function is illustrated with reference to access channel.The MAC channel is used to control the message transmission rate of Traffic Channel, thereby makes that the MAC channel can exist continuously when hybrid access terminal 110 is connected to the 1xEV-DO system.The RRI channel of MAC channel is used for representing the information of the message transmission rate of Traffic Channel when hybrid access terminal 110 sends data by Traffic Channel.The RRI value is presented in the hybrid access terminal 110.
In addition, the DRC channel is determined according to the channel circumstance of forward link can demodulated data speed, and with the data transfer rate informing base station.In other words, 1xEV-DO access network transceiver subsystem 124 utilizes the time slot of forward link to send grouped data to hybrid access terminal 110.Meanwhile, the basis of determining transmission of packet data speed is the DRC coverage values (covervalue) that hybrid access terminal 110 sends.In order to determine the DRC coverage values, hybrid access terminal 110 is measured C/I (Carrier interference ratio) value that sends from 1xEV-DO access network transceiver subsystem 124, and the DRC coverage values of definite peak transfer rate.
The Ack channel is used at sending response signal at hybrid access terminal 110 by the data that forward link receives in a time slot unit.The Ack channel is applicable to the data with short length, and corresponding to half of the length of a time slot, disturbs so that reduce.
Similar with the data channel of access channel, data channel uses when hybrid access terminal 110 only transmits grouped data.
Simultaneously, have the length of 26.66ms, and its transmission bit rate changes according to the length of grouping as the grouping of the Basic Transmission Unit of Traffic Channel.Pilot channel, Traffic Channel, DRC channel and Ack channel utilize walsh code (Walsh Code) to distinguish mutually, and walsh code is a kind of orthogonal code.
Fig. 4 shows example embodiment according to the present invention, by being limited in the flow chart that overhead messaging that the hybrid access terminal 110 that switches to the 1X pattern during the 1xEV-DO communications status upgrades reduces the process of call drop.
When the user connects the power supply of hybrid access terminal 110, the pilot signal that hybrid access terminal 110 receives from the 1X controller 132 and the 1X transceiver 122 of 1X system, thereby initialization 1X pattern, and make hybrid access terminal 110 remain on idle condition.In addition, hybrid access terminal 110 utilizes the system parameters message that obtains when initialization 1X pattern, with pilot signal from 1xEV-DO access network controller 134 and 124 transmissions of 1xEV-DO access network transceiver subsystem, initialization 1xEV-DO pattern, then, make hybrid access terminal 110 remain on idle condition (S400).
Initialization the double monitoring (S402) carried out between 1X patterns and the 1xEV-DO pattern of the hybrid access terminal 110 of 1X pattern and 1xEV-DO pattern.
At this moment, when hybrid access terminal 110 is carried out double monitoring at 1X pattern and 1xEV-DO pattern under idle condition, if there are data to send to hybrid access terminal 110 from 1xEV-DO access network transceiver subsystem 124, or the user passes through the keyboard button of operation hybrid access terminal 110 to 1xEV-DO system request data, check whether started the 1xEV-DO pattern and whether hybrid access terminal 110 has entered the service condition (S404) of reception/transmission data so.Hybrid access terminal 110 must with hybrid access terminal 110 enter service condition and to/set up and being connected and dialogue of 1xEV-DO access network transceiver subsystem 124 from the mode of 1xEV-DO access network transceiver subsystem 124 transmission/reception data.
At step S404, if hybrid access terminal 110 enters the service condition of 1xEV-DO pattern, so hybrid access terminal 110 to/from 1xEV-DO system transmission/receiving block data (S406).
Under the service condition of step 406 to/in 1xEV-DO system transmission/receiving block data, hybrid access terminal 110 utilization (for example is contained in the predetermined monitoring time of timer inspection in the hybrid access terminal 110,5.12 second) whether pass by, so that periodically search for 1X system (S408).
In step S408, if hybrid access terminal 110 determines that predetermined monitoring time is over and done with, hybrid access terminal 110 switches to 1X pattern (S410) so.More particularly, by be contained in wherein the MSM chip and the operation of searcher module, make hybrid access terminal 110 switch to the 1X pattern.In this state, hybrid access terminal 110 is searched for the 1X system from the mode of the calling of 1X system and is received and demodulation overhead messaging (S410) by responding with hybrid access terminal 110.
The MSM chip that receives the hybrid access terminal 110 of overhead messaging in step S410 checks whether receive all predetermined basic overhead messagings (S412) continuously.
If in step S412, hybrid access terminal 110 is determined to have received all predetermined basic overhead messagings, and hybrid access terminal 110 no longer receives other overhead messagings so, and turns back to 1xEV-DO pattern (S414).Certainly, predetermined monitoring time in the past after, send by turning back to the 1xEV-DO pattern/hybrid access terminal 110 of receiving block data turns back to step 410 once more, so that continue repeating step 410 to 414.
According to one embodiment of present invention, can solve call drop problem and without the resource of 1X system or 1xEV-DO system, hybrid access terminal 110 with the 1xEV-DO system carry out receiving under the service condition of data communication the 1X system be used for the overhead messaging of call and location registers the time, this call drop problem of generation between hybrid terminal 110 and 1xEV-DO system.
From above explanation, can see, usually because a variety of causes when searching for the 1X system under the service condition of hybrid access terminal between hybrid access terminal and 1xEV-DO system can be cancelled problem by bid.But according to the present invention, by limiting hybrid access terminal upgrades overhead messaging under the 1X pattern kind and quantity, hybrid access terminal can as far as possible promptly turn back to the 1xEV-DO pattern, thereby can solve the call drop problem.
In addition, according to the present invention, whether the inspection of hybrid access terminal own receives predetermined basic overhead messaging, and turn back to the 1xEV-DO system, and do not use the resource of 1X system and 1xEV-DO system, thus the waste of the communication resource prevented, and prevented that the 1xEV-DO system from being transshipped.
Although be considered to most realistic and preferred embodiment explanation the present invention in conjunction with current, but, should be appreciated that the embodiment and the accompanying drawing that the invention is not restricted to disclose, but opposite, the present invention should comprise the interior various modifications and the change of spirit and scope of claims.
Claims (18)
1. overhead messaging that is used for when being limited in hybrid access terminal with 1xEV-DO system communication and periodically switching to the CDMA20001X pattern, prevent the system of the call drop between hybrid access terminal and CDMA 20001xEV-DO (evolution data of the optimization) system, this system comprises:
Hybrid access terminal, the 1X pattern that receives voice signal transmission service or low-rate data transmission service from the 1X system, operate, with receive the 1xEV-DO pattern that high data rate sends service from the 1xEV-DO system, operating, periodically switch to the 1X pattern with the hybrid access terminal of 1xEV-DO system communication, so that reception overhead messaging, if and received predetermined basic overhead messaging, would turn back to the 1xEV-DO pattern;
BTS under CROS environment, comprise be used for to/from the 1xEV-DO access network transceiver of hybrid access terminal transmission/receiving block data and be used for to/from the 1X transceiver of hybrid access terminal transmission/reception speech or data;
Base station controller comprises that the grouped data that is used to control 1xEV-DO access network transceiver sends the 1xEV-DO access network controller of service and is used to control the 1X controller of the transmission service of 1X transceiver; With
Packet data serving node (PDSN) is connected to the 1xEV-DO access network controller so that hybrid access terminal to/from 1xEV-DO system transmission/receiving block data,
Wherein said overhead messaging comprises system parameters message, access parameter messages, Extended System Parameters Message, neighbor list parameter message and channel list parameter message, and wherein said predetermined basic overhead messaging comprises system parameters message and access parameter messages.
2. system according to claim 1, wherein, when receiving all basic overhead messagings in hybrid access terminal, hybrid access terminal stops message sink work and turns back to the 1xEV-DO pattern.
3. system according to claim 1, wherein hybrid access terminal is set to the 1X pattern in its idle condition, so that communicate with the 1X system, and periodically switch to the 1xEV-DO pattern in the preset time cycle, so that check whether receive data, and turn back to the 1X pattern by the 1xEV-DO system.
4. system according to claim 1, wherein the hybrid access terminal from 1xEV-DO system reception high data rate is periodically switched to the 1X pattern in the preset time cycle in the 1xEV-DO pattern, so that check whether receive signal, and turn back to the 1xEV-DO pattern by the 1X system.
5. system according to claim 1, wherein under the situation of the forward link that sends data from the 1xEV-DO system to hybrid access terminal, use time division multiple access (TDMA) method, and under the situation of the reverse link that sends data from hybrid access terminal to the 1xEV-DO system, employing code division multiple access (CDMA) method.
6. system according to claim 5, wherein under the situation of forward link, by sending data with maximum power and not carrying out power control ground and carry out the hard handoff switching, and under the situation of reverse link, when carrying out power control, carry out soft handover at each hybrid access terminal.
7. system according to claim 1, wherein by under the control of mobile station modems chip, using the frequency of searcher module tracks 1X system, with hybrid access terminal from the 1xEV-DO mode switch to the 1X pattern.
8. system according to claim 5, wherein forward link comprises being used to send and makes the 1xEV-DO system can follow the tracks of the pilot channel of the pilot signal of hybrid access terminal, be used to control medium access control (MAC) channel of reverse link, be used for from the 1xEV-DO system to hybrid access terminal send broadcast or be used for the specific hybrid access terminal of directly control direct message control channel and be used for only sending to hybrid access terminal the Traffic Channel of grouped data from the 1xEV-DO system.
9. method, be used for by being limited in and the hybrid access terminal of the 1xEV-DO system communication overhead messaging when periodically being switched to CDMA 20001X pattern prevents call drop between hybrid access terminal and CDMA2000 1xEV-DO (evolution data of the optimization) system, the method comprising the steps of:
(a), utilize so that the 1xEV-DO pattern that the system parameters that hybrid access terminal obtains when resting on the mode initialization 1X pattern of idle condition is come the initialization hybrid access terminal so that hybrid access terminal rests on the 1X pattern of the mode initialization hybrid access terminal of idle condition;
(b) rest under the state of idle condition at hybrid access terminal, utilize hybrid access terminal to carry out double monitoring at 1X pattern and 1xEV-DO pattern;
(c) allow hybrid access terminal to enter the service condition of 1xEV-DO pattern, make between hybrid access terminal and 1xEV-DO system, to set up to be connected and to converse, thus make hybrid access terminal can to/from 1xEV-DO system transmission/receiving block data;
(d) if passed through predetermined monitoring time, hybrid access terminal is switched to the 1X pattern;
(e) make hybrid access terminal receive overhead messaging; With
(f) if hybrid access terminal receives all predetermined basic overhead messagings, then allow hybrid access terminal to turn back to the 1xEV-DO pattern.
10. method according to claim 9, wherein, at step (d), predetermined monitoring time is 5.12 seconds, predetermined monitoring time calculates after hybrid access terminal turns back to the 1xEV-DO pattern.
11. method according to claim 9, wherein, at step (d), hybrid access terminal is switched to the 1X pattern carry out by searcher module, under the control of the mobile station modems chip of searcher module in being contained in hybrid access terminal, follow the tracks of the frequency of using in the 1X system.
12. method according to claim 9, wherein, at step (e), the overhead messaging of hybrid access terminal demodulate reception is stored in the predetermined memory with the overhead messaging with demodulation.
13. method according to claim 9, wherein, at step (f), basic overhead messaging comprises system parameters message and access parameter messages.
14. method according to claim 9, wherein, at step (f), the operation that allows hybrid access terminal to return the 1xEV-DO pattern is carried out by searcher module, under the control of the mobile station modems chip of searcher module in being contained in hybrid access terminal, follow the tracks of the frequency of using in the 1xEV-DO system.
15. a hybrid access terminal, if the overhead messaging that wherein receives by inspection after switching to the 1X pattern has satisfied predetermined condition, described hybrid access terminal then returns the 1xEV-DO pattern, and described hybrid access terminal comprises:
Timer is used for checking whether passed through predetermined monitoring time, so that periodically search for the 1X system;
Searcher module is used for following the tracks of and inversion frequency, so that carry out the switching of hybrid access terminal between 1X pattern and 1xEV-DO pattern in hardware, and receives overhead messaging;
Finger module is used for the overhead messaging that demodulation receives by searcher module; With
The mobile station modems chip, be used for by the switching of software control hybrid access terminal between 1X pattern and 1xEV-DO pattern, transmission/the reception of the data between control hybrid access terminal and 1X system and the 1xEV-DO system, if with when hybrid access terminal has been switched to the 1X pattern, to receive predetermined basic overhead messaging, hybrid access terminal then turns back to the mode of 1xEV-DO pattern and controls hybrid access terminal.
16. hybrid access terminal according to claim 15, wherein hybrid access terminal is according to the frequency of using in predetermined monitoring periods search 1X system or the 1xEV-DO system, so that operate in 1X pattern or 1xEV-DO pattern.
17. hybrid access terminal according to claim 15, wherein the predetermined basic overhead messaging that arrives of hybrid access terminal demodulate reception is stored in the predetermined memory with the predetermined basic overhead messaging demodulation.
18. hybrid access terminal according to claim 15, if wherein hybrid access terminal receives all the other overhead messagings, the hybrid access terminal of having stored basic overhead messaging then turns back to the state of hybrid access terminal response from the voice call of 1X system that allow.
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| KR1020020087462 | 2002-12-30 | ||
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| KR100840366B1 (en) | 2004-08-11 | 2008-06-20 | 삼성전자주식회사 | Method for simplifying preparatory access procedure between mobile station and base station |
| KR100693600B1 (en) * | 2004-08-25 | 2007-03-14 | 주식회사 팬택앤큐리텔 | Hybrid mobile communication terminal and method for controlling the operation mode of the terminal |
| KR100652695B1 (en) * | 2004-11-11 | 2006-12-07 | 엘지전자 주식회사 | Data communication mode switching method for mobile communication device |
| CN100425083C (en) * | 2005-07-22 | 2008-10-08 | 北京三星通信技术研究有限公司 | Non-interference method in double mode terminal high speed grouping data service |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20010008695A (en) * | 1999-07-02 | 2001-02-05 | 김영환 | Dual mode mobile terminal shared intermediate frequency |
| KR20020049819A (en) * | 2000-12-20 | 2002-06-26 | 엘지전자 주식회사 | Method for Concurrent Servicing in Mobile Communication System |
| JP2002345019A (en) * | 2001-05-11 | 2002-11-29 | Kyocera Corp | Portable communication terminal and wireless communication system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20010008695A (en) * | 1999-07-02 | 2001-02-05 | 김영환 | Dual mode mobile terminal shared intermediate frequency |
| KR20020049819A (en) * | 2000-12-20 | 2002-06-26 | 엘지전자 주식회사 | Method for Concurrent Servicing in Mobile Communication System |
| JP2002345019A (en) * | 2001-05-11 | 2002-11-29 | Kyocera Corp | Portable communication terminal and wireless communication system |
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| KR100546509B1 (en) | 2006-01-25 |
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