CN100438359C - Method and system for preventing call drop by limiting search time of 1X system during 1XEV-DO traffic state - Google Patents
Method and system for preventing call drop by limiting search time of 1X system during 1XEV-DO traffic state Download PDFInfo
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- CN100438359C CN100438359C CNB2003801100312A CN200380110031A CN100438359C CN 100438359 C CN100438359 C CN 100438359C CN B2003801100312 A CNB2003801100312 A CN B2003801100312A CN 200380110031 A CN200380110031 A CN 200380110031A CN 100438359 C CN100438359 C CN 100438359C
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/02—Terminal devices
- H04W88/06—Terminal devices adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/16—Discovering, processing access restriction or access information
Abstract
Disclosed is a method and a system for preventing a call drop by limiting a search time for a 1X system during a 1xEV-DO system traffic state. 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 while in traffic with the 1xEV-DO system, updating an overhead message, checking a search time and switching over to the 1xEV-DO system based on a result of the search time; a base station transceiver subsystem including a 1xEV-DO transceiver subsystem for exchanging a packet data with the hybrid access terminal and a 1X transceiver subsystem for exchanging a voice or data with the hybrid access terminal; a base station controller including a 1xEV-DO controller for controlling a packet data transmission service of the 1xEV-DO transceiver subsystem and a 1X controller for controlling transmission service of the 1X transceiver subsystem; 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 by during the restriction 1xEX-DO system communication state to the method and system that prevents call drop search time of 1X system, more particularly, relate to and a kind ofly reach preset time during the cycle when hybrid access terminal search 1X system, by with restriction search time of the hybrid access terminal of 1xEX-DO system communication within the predetermined time, prevent the method and system of the call drop of the hybrid access terminal carried out by the 1xEX-DO system because hybrid access terminal rests on that the 1X pattern has surpassed preset time.
Background technology
Mobile communication system has developed into second generation honeycomb/personal communication service (PCS) 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-speed data communication system.
The standard that provides the CDMAIMT-2000 system as the 3GPP2 (third generation partner program 2) of cooperation international standard group is as the IMT-2000 standard, 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 HDR (high data rate) of Qualcom company (Qualcom Incorporated) suggestion, that be called " 1xEV (evolution: evolution) " as the international standard high-speed grouped data system.CDMA 20001xEV-DO (dataoptimized or data only: optimize data or only be used for data) system is from CDMA 20001X system upgrade, and is designed for and only sends data.
In the following description, for convenience of explanation, 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 peak 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 peak transfer rate is provided is the high-rate packet data services 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 be installed in the wireless base station or base station controller in, although they are separate operations.That is to say that the transceiver of wireless base station comprises the channel card and the channel card that is used for the 1X system that are used for the 1xEV-DO system.In addition, base station controller comprises a data processing plate and a data processing plate that is used to handle from the data of 1X system transmission that is used to handle from the grouped data of 1xEV-DO system transmission.
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 each in 1xEV-DO system and the 1X system with the preset time cycle.In other words, hybrid access terminal periodically and is alternately searched for 1xEV-DO and 1X system and 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 rate 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 is periodically visited the 1X system, hybrid access terminal just must rest in the 1X system, upgrades fully up to system resource.
In addition, when hybrid access terminal during, if at preset time in the cycle (for example, 5.12 seconds) with 1xEV-DO system communication, the 1xEV-DO system does not receive the signal from hybrid access terminal, and the 1xEV-DO system can carry out call drop operation so.That is, no matter its reason how, if do not search the signal from hybrid access terminal in the 1xEV-DO system predetermined time cycle, the 1xEV-DO system carries out the call drop operation of relevant hybrid access terminal so, so that effectively utilize system resource.
But call drop may reduce the reliability of communication service, and brings inconvenience for the user who does not carry out call drop with respect to the 1xEX-DO system and bother.
Summary of the invention
Therefore, the present invention considers the problems referred to above and makes, the objective of the invention is to provide a kind of and can search for 1X system preset time during the cycle at hybrid access terminal, by with restriction search time of the hybrid access terminal of 1xEX-DO system communication within the predetermined time, prevent the method and system of the call drop of the hybrid access terminal carried out by the 1xEX-DO system because hybrid access terminal rests on that the 1X pattern has surpassed preset time.
In order to reach this purpose, according to an aspect of the present invention, a kind of predetermined search time that is used for CDMA 20001X system by restriction is provided, prevent CDMA 20001xEV-DO system and and the system that bid is cancelled between the hybrid access terminal of CDMA 20001xEV-DO system communication, this system comprises: hybrid access terminal, operate in relevant with CDMA 20001X system, be used to receive from the voice signal transmission service of CDMA20001X system or the CDMA 20001X pattern of low-rate data transmission service, with operate in relevant with the 1xEV-DO system, be used to receive 1xEV-DO pattern from the high speed data transfers service of 1xEV-DO system, periodically switch to CDMA 20001X pattern so that upgrade overhead messaging with the hybrid access terminal of 1xEV-DO system communication, if passed through predetermined search time, then turned 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 CDMA 20001X transceiver of hybrid access terminal transmission/reception speech or data; Base station controller comprises the 1xEV-DO access network controller of the packet data transmission service that is used to control 1xEV-DO access network transceiver and is used to control the CDMA 20001X controller of the transmission service of CDMA 20001X transceiver; And packet data serving node (PDSN), be connected to the 1xEV-DO access network controller, so that to/from 1xEV-DO system transmission/receiving block data, wherein be Yu Ding search time after the hybrid access terminal with 1xEV-DO system communication switches to CDMA 20001X pattern, renewal is used for the location register of CDMA 20001X system and the required time of overhead messaging of call request, and periodically be 5.12 seconds the cycle time of Qie Huaning.
In order to reach this purpose, according to a further aspect in the invention, be provided a kind of search time that is used for CDMA 20001X system by restriction, prevent CDMA 20001xEV-DO system and and the method that bid is cancelled between the hybrid access terminal of CDMA 20001xEV-DO system communication, the method comprising the steps of: (a) sequentially start the CDMA 20001X pattern and the 1xEV-DO pattern of hybrid access terminal, make hybrid access terminal rest on idle condition; (b) rest under the state of idle condition at hybrid access terminal, utilize hybrid access terminal to replace and the monitoring of periodically carrying out relevant CDMA 20001X pattern and 1xEV-DO pattern; (c) allow hybrid access terminal to enter the service condition of 1xEV-DO pattern, make it possible to that formation is connected and talks with between hybrid access terminal and 1xEV-DO system, 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 CDMA 20001X pattern, described predetermined monitoring time is 5.12 seconds, and this time calculates after hybrid access terminal switches to the 1xEV-DO pattern; (e) when hybrid access terminal switches to CDMA 20001X pattern, check the signal of switching time and detection CDMA 20001X system, the described predetermined time started of returning is to switch to the CDMA20001X pattern, so that detect the switching time that the hybrid access terminal of the signal of CDMA 20001X system begins to turn back to the 1xEV-DO pattern; (f) if reach the predetermined time started of returning switching time, then allow hybrid access terminal to turn back to the 1xEV-DO pattern.
In order to reach this purpose, according to a further aspect of the invention, be provided a kind of search time that is used for CDMA 20001X system by restriction, prevent CDMA 20001xEV-DO system and and the hybrid access terminal that bid is cancelled between the hybrid access terminal of CDMA 20001xEV-DO system communication, this hybrid access terminal comprises: timer is used for measuring switching time during from the 1xEV-DO mode switch to CDMA 20001X pattern at hybrid access terminal; Searcher module, be used to follow the tracks of and inversion frequency so that carry out the switching of hybrid access terminal between CDMA 20001X pattern and 1xEV-DO pattern, and reception overhead messaging; Finger module is used for the overhead messaging that demodulation receives from searcher module; With the mobile station modems chip, alternately and periodically search for 1xEV-DO system and CDMA 20001X system, if the mobile station modems chip receives from timer and returns commencing signal in search CDMA20001X system, then generate return control signal, with return control signal is sent to searcher module, if wherein reach the predetermined time started of returning the switching time of Ce Lianging, timer generates and returns commencing signal, to return commencing signal and be sent to the mobile station modems chip, the described predetermined time started of returning is to upgrade to be used for the location register of CDMA 20001X system and the required time of overhead messaging of call request, and periodically be 5.12 seconds Sou Suo cycle time.
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 a present invention example embodiment, is used for the search time by restriction hybrid access terminal search 1X system, prevents the schematic block diagram of system of the call drop of hybrid access terminal;
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 access network transceiver subsystem;
Fig. 4 is demonstration example embodiment according to the present invention, is used for when hybrid access terminal and 1xEV-DO system communication, by limiting the search time for the 1X system, prevents the schematic diagram of hybrid access terminal from the process of the call drop of 1xEV-DO system; With
Fig. 5 shows according to a present invention example embodiment, is used for by the search time of restriction for the 1X system, prevents the 1xEV-DO system and the flow chart of the process of call drop and between the hybrid access terminal of 1xEV-DO system communication.
Embodiment
Below at length with reference to the preferred embodiments of the present invention.
Below of the present invention, in the explanation, omitted the explanation that may cause unclear known function of technical theme of the present invention and structure for those.
Fig. 1 is demonstration example embodiment according to the present invention, is used for the search time by restriction hybrid access terminal 110 search 1X systems, prevents system's 100 schematic block diagrams of the call drop of hybrid access terminal 110.
As shown in fig. 1, system 100 of the present invention comprise 1xEV-DO system and 1X system the two.In other words, system 100 has the 1X system that communicates by letter with hybrid access terminal 110, and the 1X system is made of 1X transceiver 122,1X controller 132 and mobile switching centre (MSC) 140, so that send speech and data.In addition, system 100 has the 1xEV-DO system that communicates by letter with hybrid access terminal 110, the 1xEV-DO system is made of 1xEV-DO access network transceiver subsystem (ANTS) 124,1xEV-DO access network controller (ANC) 134, packet data serving node (after this abbreviating PDSN as) 150 and Internet protocol (IP) net 160, so that only send data.
The switching of operating between 1xEV-DO system and 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 the baseband modem chip that is contained in the hybrid access terminal 110.In addition, switching and return function is to finish by the frequency that the searcher that use is connected to the MSM chip is followed the tracks of each network.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, utilize the channel that CDMA (code division multiple access) method is cut apart to send data by time slot, time slot utilizes TDM (time division multiplexing) method to cut apart.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 at 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.
In addition, mobile switching centre 140 is by the home location register (after this abbreviating " HLR " as) 132 from be deposited with the database of information of the hybrid access terminal the mobile switching centre 140 as storage, visitor location register (after this abbreviating " VLR " as) 134 with hybrid access terminal 110 database of information in the zone that is arranged in mobile switching centre 140 as storage, obtain the profile information (profile 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 124 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 to be used to make the 1xEV-DO system can follow the tracks of the pilot signal of hybrid access terminal 110 with transmission.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 of pilot channel being carried out with the wireless base station with 1xEV-DO system of opposing by hybrid access terminal 110.
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, control transmission 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 every frame, and every frame has the time interval of about 26.67ms.In addition, each time slot comprises half time slot with 1024 chips and back half time slot with 1024 chips, that is, time slot has 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 400 data time slot code sheets, 64 MAC time slot chips, 96 pilot time slot chips, 64 MAC time slot chips and 400 data time slot code sheets.
Fig. 3 shows from the block diagram of hybrid access terminal 110 to the channel architecture of the reverse link of 1xEV-DO access network transceiver subsystem 124 transmission data.
Reverse link shown in Fig. 3 can the mode identical with the 1X system use the CDMA method, 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 data rate control (DRC) channel once more.
Access channel is used to send start connection _ request (connection_request) message and one and deposits route _ renewal (registration route_update) message.Access channel has the low transmission rate of the stable 9.6kbps that is used to make wireless channel.
The same with the pilot channel in the forward link shown in Fig. 2 A, the pilot channel shown in Fig. 3 is as the reference that has the coherent detection of the wireless base station of 1xEV-DO system carrying out by 110 pairs of hybrid access terminals.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 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 rate informing base station.That is, 1xEV-DO access network transceiver subsystem 124 utilizes the time slot of forward link to send grouped data to hybrid access terminal 110.At this moment, the foundation of determining the transmission of packet data rate is the DRC substitution value (covervalue) that hybrid access terminal 110 sends.In order to determine the DRC substitution value, 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 substitution value of definite peak transfer rate.
The Ack channel is used for sending the response signal of the data that receive by forward link at hybrid access terminal 110 in a time slot unit.The Ack channel is applicable to half data that have short length and be equivalent to a slot length, disturbs so that reduce.
The same with the data channel of access channel, when hybrid access terminal 110 only transmits grouped data, use this data channel.
Simultaneously, have the length of 26.66ms, and its transmission bit rate changes according to the size of grouping as the grouping of the BTU 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 is demonstration example embodiment according to the present invention, be used for when hybrid access terminal 110 and 1xEV-DO system communication, for search time of 1X system, prevent the schematic diagram of the process that hybrid access terminal 110 is cancelled from the 1xEV-DO system calling by restriction.
According to an example embodiment of the present invention, the hybrid access terminal 110 that is illustrated in search time with 1xEV-DO system communication turns back to after the 1X pattern, up to having upgraded overhead messaging so that carry out Speech Communication, call request and required time cycle of location register such as SMS (Short Message Service) receives.
As shown in fig. 1, in order whether to have checked by the 1X system request calling, use the grouped data and the hybrid access terminal 110 of 1xEV-DO system communication to switch to the 1X pattern, so that search for the 1X system with the preset time cycle (for example, 5.12 seconds).When resting on the 1X pattern, hybrid access terminal 110 upgrades overhead messaging, so that executing location is deposited processing, and handles the call request that transmits from the 1X system.
Here, call request represents that voice call request or SMS are sent to hybrid access terminal 110.Overhead messaging also comprises system parameters message, access parameter messages, Extended System Parameters Message, neighbor list parameter message, and channel list parameter message.
System parameters message comprises the required NID of receipt of call (network ID), SCI (slot cycle index), and packet zone ID, or the like.Access parameter messages comprises in order to insert the 1X system from the 1xEV-DO system, the information that hybrid access terminal 110 is required.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' cellular unit that is positioned at cellular unit wherein in abutting connection with a hybrid access terminal 110.Channel list parameter message comprises relevant after hybrid access terminal 110 has been set up calling, makes hybrid access terminal 110 can send/receive the information of the channel of data or speech.
In using the two mobile communication environment of 1xEV-DO system and 1X system, hybrid access terminal 110 rests on the 1X pattern, and monitoring 1X system is up to having upgraded above-mentioned all overhead messagings.But if the 1xEV-DO system does not detect the signal from hybrid access terminal 110 at preset time in the cycle (for example, define in the standard 5.12 seconds), the 1xEV-DO system carries out the call drop of relevant hybrid access terminal 110 so.
Therefore, according to the present invention, after hybrid access terminal 110 switches to the 1X pattern, before 5.12 seconds past times, hybrid access terminal 110 turns back to the 1xEV-DO pattern, thereby in the 1xEV-DO system and switch between the hybrid access terminal 110 of 1X pattern and can not cancel by bid.Above-mentioned functions is to realize in the inside of hybrid access terminal 110.
More particularly, by being contained in MSM chip, searcher module, finger module and the timer in the hybrid access terminal, force hybrid access terminal 110 to turn back to the 1xEV-DO pattern from the 1X pattern.The MSM chip has handles and controls the function that occurs in the various operations in the hybrid access terminal 110.The MSM chip is also controlled by the user's transmission/reception of the value of hybrid access terminal 110,1xEV-DO system, 1X system and input speech or keyboard button and/or the various data of I/O.In addition, the MSM chip comprises CPU (CPU) and is used for the vocoder of coded speech.
Therefore, when hybrid access terminal 110 during with 1xEV-DO system communication, the MSM chip is by using software wherein, with the periodic time interval, carries out the monitoring operation of relevant 1X system.This monitoring operation is finished by searcher module.In other words, searcher module with preset time at interval, is followed the tracks of the frequency of 1X system, and is carried out the monitoring operation under the control of MSM chip.
Meanwhile, in searcher module monitors 1X system, the modulation signal or the data that receive by searcher module are sent to the MSM chip.After this, the MSM chip is sent to finger module to the modulation signal or the data that receive from searcher module.The finger module that receives modulation signal or data from the MSM chip is by CDMA demodulation method demodulation modulation signal or data.Also by TDMA demodulation method demodulation modulation signal or data by the searcher module reception in searcher module monitors 1xEV-DO system.
Meanwhile, according to spirit of the present invention, the MSM chip arrives the 1X pattern with the 1xEV-DO mode switch, and operates the timer that is contained in the hybrid access terminal 110, so that search 1X system.If receiving operating control signal so that when measuring switching time from the MSM chip, passed through the predetermined return time of timer, timer then is sent to the MSM chip with a predetermined commencing signal that returns.
That is to say that according to spirit of the present invention, MSM chip or timer have the predetermined time started information of returning that makes the hybrid access terminal 110 of searching for the 1X system after switching to the 1X pattern can turn back to the 1xEV-DO pattern.Therefore, receive the predetermined MSM chip that returns commencing signal from timer and stop the operation of search 1X system and set up a return control signal so that return control signal is sent to searcher, thereby make hybrid access terminal turn back to the 1xEV-DO pattern.At this moment, the utilization of MSM chip is stored in the time started of returning in the MSM chip, and whether arrive the switching time of inspection timer measuring is returned the time started.Then, the MSM chip is set up return control signal, and return control signal is sent to searcher.
Meanwhile, according to one embodiment of present invention, the hybrid access terminal 110 that has switched to the 1X pattern carries out the one predetermined search period corresponding to " SCI=1 " to " SCI=3 " with the search of overhead messaging.Here, according to standard, " SCI=1 " is equivalent to 1.12 seconds time, so hybrid access terminal 110 is 3.36 seconds (1.12 seconds * 3) from the time started of returning that the 1X pattern turns back to the 1xEV-DO pattern, this is the search termination time.That is to say that if the MSM chip relies on timer to be checked through 3.36 seconds time, the MSM chip stops the search operation to the 1X system, and hybrid access terminal 110 turns back to the 1xEV-DO pattern after hybrid access terminal 110 switches to the 1X pattern.
In addition, when consider that when having pass by the call drop of 1xEV-DO system took place 5.12 seconds the time, be set to 3.36 seconds the search time that preferably will allow hybrid access terminal 110 according to the present invention to search for the 1X systems after hybrid access terminal 110 switches to the 1X pattern.At this moment, also leave 1.76 seconds time owing to cancelling, so hybrid access terminal 110 can turn back to the 1xEV-DO pattern safely to bid between 1xEV-DO system and the hybrid access terminal 110.According to one embodiment of present invention, although return by the safety of considering hybrid access terminal 110, returning the time started is set to corresponding to " SCI=3 " 3.36 seconds, but also can return the time started is set to corresponding to " SCI=4 " 4.48 seconds.In this case, owing to return the time that the 1xEV-DO pattern also has 0.64 second to hybrid access terminal 110, so hybrid access terminal switches to the 1xEV-DO system safely.
In addition, when hybrid access terminal 110 switches to the 1X system and rests on the 1X pattern, receive and the signal of demodulation and storage in the internal storage of hybrid access terminal 110.Therefore, hybrid access terminal 110 turns back to the 1xEV-DO pattern, operates in the state with 1xEV-DO system communication, and after (for example, the 5.12 seconds) past, turns back to the 1X pattern at preset time once more.At this moment, if hybrid access terminal 110 only receives and demodulation except from before overhead messaging the overhead messaging that the search operation of 1X system is obtained, can handle the calling in the 1X system so.
Fig. 5 shows according to an embodiment of the inventionly, is used for by the search time of restriction to the 1X system, prevents 1xEV-DO system and and the flow chart of the process of the call drop between the hybrid access terminal 110 of 1xEV-DO system communication.
When the user connected the power supply of hybrid access terminal 110, hybrid access terminal 110 received the pilot signal from the 1X controller 132 and the 1X transceiver 122 of 1X system, thereby started the 1X pattern, and made hybrid access terminal 110 remain on idle condition.In addition, system parameters message that hybrid access terminal 110 utilization obtains when starting the 1X patterns and the pilot signal that sends from 1xEV-DO access network controller 134 and 1xEV-DO access network transceiver subsystem 124, start the 1xEV-DO pattern, then, hybrid access terminal 110 is remained on idle condition (S500).
After having started 1X pattern and 1xEV-DO pattern, the double monitoring that hybrid access terminal 110 is carried out between 1X pattern and the 1xEV-DO pattern.In this case, hybrid access terminal 110 under the 1X pattern, with 5.12 seconds time interval monitoring 1xEV-DO systems 1 minute, after this, with 40 seconds time interval monitoring 1xEV-DO system (S502).
In addition, under idle condition, hybrid access terminal 110 is alternately monitored 1X system and 1xEV-DO system.At this moment, if there are data to send to hybrid access terminal 110 from 1xEV-DO access network transceiver subsystem 124, or the button of user by operation hybrid access terminal 110 be to 1xEV-DO system request data, checks so whether to have started the 1xEV-DO pattern and whether hybrid access terminal 110 has entered the service condition (S504) of reception/transmission data.In order to make hybrid access terminal 110 can enter service condition, can with hybrid access terminal 110 can to/from the mode of 1xEV-DO access network transceiver subsystem 124 transmissions/reception data, formation is connected and talks with between hybrid access terminal 110 and 1xEV-DO access network transceiver subsystem 124.
If in step S504, 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 (S506).
The hybrid access terminal 110 that is in service condition in step S506 to/in 1xEV-DO system transmission/receiving block data, hybrid access terminal 110 utilizes the timer inspection that is contained in the hybrid access terminal 110 (for example whether to pass by predetermined monitoring time, 5.12 second), so that periodically search for 1X system (S508).
If hybrid access terminal 110 determines that in step S508 predetermined monitoring time is over and done with, hybrid access terminal switches to the 1X pattern so, and begins overhead messaging of searching for the 1X system or the like (S510).In this case, to switch to the 1X pattern be that operation by MSM chip and searcher module causes to hybrid access terminal 110.
If in step S514, hybrid access terminal 110 determines that the predetermined search time is over and done with, so hybrid access terminal 110 in stopping the 1X system search operation and be stored in the overhead messaging that has received in the memory after, turn back to 1xEV-DO pattern (S516).In addition, after the past, turn back to the hybrid access terminal 110 repeating step S510 to S516 of 1xEV-DO pattern at predetermined monitoring time.
According to one embodiment of present invention, can not use the resource of 1X system or 1xEV-DO system, solve and the hybrid access terminal 110 search 1X systems of 1xEV-DO system communication so that response is called out or location register occurred in call drop problem between hybrid access terminal 110 and the 1xEV-DO system in the 1X system time.
From above explanation, can see, usually when searching for the 1X system, because the problem that a variety of causes meeting bid is cancelled with the hybrid access terminal of 1xEV-DO system communication.But, according to the present invention, by the search time that restriction is used to search for the 1X system, hybrid access terminal can turn back to the 1xEV-DO pattern before cancelling at bid between hybrid access terminal and the 1xEV-DO system, thereby can solve undesirable call drop problem.
In addition, according to the present invention, the time that hybrid access terminal itself inspection is used to search for the 1X system, and turn back to the 1xEV-DO pattern, and do not used the resource of 1X system and 1xEV-DO system, thereby prevented the waste of the communication resource and prevented that the 1xEV-DO system from being transshipped.
Although think that in conjunction with current most realistic and preferred embodiment has illustrated the present invention, 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 (20)
1. one kind is used for predetermined search time of CDMA 20001X system by restriction, prevents CDMA 20001xEV-DO system and and the system that bid is cancelled between the hybrid access terminal of CDMA 20001xEV-DO system communication, and this system comprises:
Hybrid access terminal, operate in relevant with CDMA 20001X system, be used to receive from the voice signal transmission service of CDMA 20001X system or the CDMA 20001X pattern of low-rate data transmission service, with operate in relevant with the 1xEV-DO system, be used to receive 1xEV-DO pattern from the high speed data transfers service of 1xEV-DO system, periodically switch to CDMA 20001X pattern so that upgrade overhead messaging with the hybrid access terminal of 1xEV-DO system communication, if passed through predetermined search time, then turned 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 CDMA 20001X transceiver of hybrid access terminal transmission/reception speech or data;
Base station controller comprises the 1xEV-DO access network controller of the packet data transmission service that is used to control 1xEV-DO access network transceiver and is used to control the CDMA 20001X controller of the transmission service of CDMA 20001X transceiver; With
Packet data serving node (PDSN), be connected to the 1xEV-DO access network controller, so that to/from 1xEV-DO system transmission/receiving block data, wherein be Yu Ding search time after the hybrid access terminal with 1xEV-DO system communication switches to CDMA 20001X pattern, renewal is used for the location register of CDMA 20001X system and the required time of overhead messaging of call request, and periodically be 5.12 seconds the cycle time of Qie Huaning.
2. system according to claim 1, wherein hybrid access terminal is set to the CDMA20001X pattern so that communicate with the CDMA20001X system under its idle condition, and with the preset time cycle, periodically switch to the 1xEV-DO pattern, so that check whether receive data, turn back to CDMA 20001X pattern by the 1xEV-DO system.
3. system according to claim 1, wherein under the 1xEV-DO pattern, receive the hybrid access terminal of high data rate with the preset time cycle from the 1xEV-DO system, periodically switch to CDMA 20001X pattern, so that check whether receive signal, turn back to the 1xEV-DO pattern by CDMA 20001X system.
4. 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 the time division multiple access method, employing code division multiple access method under the situation of the reverse link that sends data from hybrid access terminal to the 1xEV-DO system.
5. system according to claim 4, wherein not carrying out power control carrying out hard handoff by sending data with maximum power under the situation of forward link switches, under the situation of reverse link when carrying out power control at each hybrid access terminal, carry out soft handover.
6. system according to claim 1, wherein by under the control of mobile station modems chip, following the tracks of the frequency of CDMA 20001X system, with hybrid access terminal from the 1xEV-DO mode switch to the CDMA20001X pattern.
7. system according to claim 4, 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 the media into control channel of reverse link, be used for sending broadcast or directly controlling the control channel of the direct message that specific blend accesses terminal and be used for only sending to hybrid access terminal the Traffic Channel of grouped data to hybrid access terminal from the 1xEV-DO system from the 1xEV-DO system.
8. system according to claim 1 further comprises mobile switching centre, is used for inserting route by switching communication, at the communication call that sends from hybrid access terminal, provides the communication of CDMA20001X system to insert route.
9. one kind is used for search time of CDMA 20001X system by restriction, prevents CDMA20001xEV-DO system and and the method that bid is cancelled between the hybrid access terminal of CDMA 20001xEV-DO system communication, and the method comprising the steps of:
(a) sequentially start the CDMA 20001X pattern and the 1xEV-DO pattern of hybrid access terminal, make hybrid access terminal rest on idle condition;
(b) rest under the state of idle condition at hybrid access terminal, utilize hybrid access terminal to replace and the monitoring of periodically carrying out relevant CDMA 20001X pattern and 1xEV-DO pattern;
(c) allow hybrid access terminal to enter the service condition of 1xEV-DO pattern, make it possible to that formation is connected and talks with between hybrid access terminal and 1xEV-DO system, 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 CDMA 20001X pattern, described predetermined monitoring time is 5.12 seconds, and this time calculates after hybrid access terminal switches to the 1xEV-DO pattern;
(e) when hybrid access terminal switches to CDMA 20001X pattern, check the signal of switching time and detection CDMA 20001X system, the described predetermined time started of returning is to switch to CDMA 20001X pattern, so that detect the switching time that the hybrid access terminal of the signal of CDMA 20001X system begins to turn back to the 1xEV-DO pattern;
(f) if reach the predetermined time started of returning switching time, then allow hybrid access terminal to turn back to the 1xEV-DO pattern.
10. method according to claim 9, wherein, in step (a), the system parameters that the hybrid access terminal utilization obtains when starting CDMA 20001X pattern starts the 1xEV-DO pattern.
11. method according to claim 9, wherein, in step (e), the predetermined call drop time more required than call drop between hybrid access terminal and 1xEV-DO system time started of returning lacks.
12. method according to claim 11 wherein predetermined is returned the integral multiple that the time started is set to the slot cycle index.
13. method according to claim 11, wherein the Yu Ding time started of returning was set to 3.36 seconds or 4.48 seconds.
14. method according to claim 9, wherein, in step (e), hybrid access terminal is stored in the overhead messaging that wherein receives in the predetermined memory when detecting CDMA 20001X system.
15. method according to claim 9, wherein, in step (f), the operation that allows hybrid access terminal to turn back to the 1xEV-DO pattern is to carry out by the searcher module of following the tracks of the frequency of using in the 1xEV-DO system under the control of mobile station modems chip, and wherein said mobile station modems chip and searcher module all are contained in the hybrid access terminal.
16. method according to claim 14, wherein hybrid access terminal is used for the overhead messaging that receives in the preceding search procedure of CDMA 20001X system and store the search next time of CDMA 20001X system.
17. method according to claim 16, wherein overhead messaging comprises system parameters message, access parameter messages, Extended System Parameters Message, at least one in neighbor list parameter message and the channel list parameter message.
18. search time that is used for CDMA 20001X system by restriction, prevent CDMA20001xEV-DO system and and the hybrid access terminal that bid is cancelled between the hybrid access terminal of CDMA 20001xEV-DO system communication, this hybrid access terminal comprises:
Timer is used for measuring switching time during from the 1xEV-DO mode switch to CDMA 20001X pattern at hybrid access terminal;
Searcher module, be used to follow the tracks of and inversion frequency so that carry out the switching of hybrid access terminal between CDMA20001X pattern and 1xEV-DO pattern, and reception overhead messaging;
Finger module is used for the overhead messaging that demodulation receives from searcher module; With
The mobile station modems chip, alternately and periodically search for 1xEV-DO system and CDMA20001X system, if the mobile station modems chip receives from timer and returns commencing signal in search CDMA20001X system, then generate return control signal, with return control signal is sent to searcher module, if wherein reach the predetermined time started of returning the switching time of Ce Lianging, timer generates and returns commencing signal, to return commencing signal and be sent to the mobile station modems chip, the described predetermined time started of returning is to upgrade to be used for the location register of CDMA 20001X system and the required time of overhead messaging of call request, and periodically be 5.12 seconds Sou Suo cycle time.
19. hybrid access terminal according to claim 18, wherein hybrid access terminal is according to the frequency of using in predetermined monitoring periods search CDMA 20001X system or the 1xEV-DO system, so that with CDMA 20001X pattern or the operation of 1xEV-DO pattern.
20. hybrid access terminal according to claim 18, wherein mobile station modems has about returning the information of time started, and check the switching time of timer measuring, return the time started, then generate and transmit return control signal if reach switching time.
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| KR1020020087427 | 2002-12-30 | ||
| KR20020087427 | 2002-12-30 | ||
| KR1020030053896 | 2003-08-04 |
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| CNB2003801100312A Expired - Fee Related CN100438359C (en) | 2002-12-30 | 2003-12-12 | Method and system for preventing call drop by limiting search time of 1X system during 1XEV-DO traffic state |
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| 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 |
| KR100732060B1 (en) | 2005-12-27 | 2007-06-27 | 엘지전자 주식회사 | Mobile station with multiple action mode and it's method |
| JP4749309B2 (en) * | 2006-10-30 | 2011-08-17 | 京セラ株式会社 | Wireless communication device |
| CN101622835B (en) * | 2007-01-18 | 2012-12-05 | 诺基亚公司 | Network oriented self-optimization measurement control |
| CN101415179B (en) * | 2008-11-24 | 2012-01-25 | 华为技术有限公司 | Method, apparatus and system for automatically switching business |
| US9973942B2 (en) | 2011-05-20 | 2018-05-15 | Apple Inc. | Apparatus and methods for client server interaction in hybrid network environments |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1217626A (en) * | 1997-11-06 | 1999-05-26 | Lg情报通信株式会社 | Method and system for switching between channels in telephone system |
| WO2001031963A1 (en) * | 1999-10-29 | 2001-05-03 | Telefonaktiebolaget L M Ericsson (Publ) | Mobile terminal handover from a second generation network to a third generation ip-based network |
| WO2001043487A1 (en) * | 1999-12-11 | 2001-06-14 | Qualcomm Incorporated | System and method for the detection of service from alternate wireless communication systems |
| WO2001052567A2 (en) * | 2000-01-07 | 2001-07-19 | Qualcomm Incorporated | Base station synchronization for handover in a hybrid gsm/cdma network |
-
2003
- 2003-08-04 KR KR1020030053896A patent/KR100425077B1/en not_active IP Right Cessation
- 2003-12-12 CN CNB2003801100312A patent/CN100438359C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1217626A (en) * | 1997-11-06 | 1999-05-26 | Lg情报通信株式会社 | Method and system for switching between channels in telephone system |
| WO2001031963A1 (en) * | 1999-10-29 | 2001-05-03 | Telefonaktiebolaget L M Ericsson (Publ) | Mobile terminal handover from a second generation network to a third generation ip-based network |
| WO2001043487A1 (en) * | 1999-12-11 | 2001-06-14 | Qualcomm Incorporated | System and method for the detection of service from alternate wireless communication systems |
| WO2001052567A2 (en) * | 2000-01-07 | 2001-07-19 | Qualcomm Incorporated | Base station synchronization for handover in a hybrid gsm/cdma network |
Non-Patent Citations (2)
| Title |
|---|
| 1xEV:cdma2000 1x的演进IS-856 TIA/EIA的标准. 沈立国.通信世界，第18期. 2001 |
| 1xEV:cdma2000 1x的演进IS-856 TIA/EIA的标准. 沈立国.通信世界，第18期. 2001 * |
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| KR100425077B1 (en) | 2004-03-31 |
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