CN100502590C - Techniques for supporting GSM to W-CDMA reselection - Google Patents
Techniques for supporting GSM to W-CDMA reselection Download PDFInfo
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Abstract
The present invention provides a techniques to support cell reselection from GSM to W-CDMA. A dual-mode terminal determines whether or not the GSM network that it is currently camped on supports Release 99 functionality and hence whether or not the GSM network is capable of broadcasting information for W-CDMA neighbor cells. This determination may be made based on the settings for certain status bits in messages transmitted by the GSM network and/or other information available to the terminal. The terminal can initiate a search for WCDMA cells if it is deemed that the current GSM network does not support Release 99 functionality. The terminal may also determine the scope of the W-CDMA search and when to perform the W-CDMA search based on information stored by the terminal. The reselection from GSM to W-CDMA may be achieved based on measurements obtained from the W-CDMA search and other pertinent information (e.g., threshold values used to compare the measurements).
Description
Related application
The application has required to submit on December 6th, 2002, is entitled as the interests of the interim U. S. application number 60/431322 of " being used to support the technology reselected of GSM to WCDMA ", the assignee who transfers the application, and herein in conjunction with it in full as a reference.
Technical field
The present invention relates generally to communication, relate more specifically to be used to support the technology reselected of GSM to W-CDMA.
Background technology
Wireless communication system is widely used in providing such as the dissimilar service of voice, grouped data or the like.These systems can support the multi-address system of multi-user communication by sharing the available system resource.The example of this multi-address system comprises time division multiple access (TDMA) system and code division multiple access (CDMA) system.Tdma system can be carried out one or more such as the such standard of Global Systems for Mobile communications (GSM).Cdma system can be carried out one or more such as wideband CDMA (W-CDMA), IS-2000 and the such standard of IS-95.GSM and IS-95 are respectively for the second generation of TDMA and CDMA (2G) standard, and W-CDMA and IS-2000 are the third generation (3G) standards for CDMA.These standards all are widely known by the people in this area.
GSM is a kind of wireless access technology (RAT) that voice service and low medium rate packet data services can be provided.The GSM network is in application in extensive range all over the world.W-CDMA is a kind of new wireless access technology that enhanced service and performance (as, higher data rate, voice and data call coexistence, or the like) can be provided.A key request in the W-CDMA exploitation is to operate with existing GSM network seamless.Like this W-CDMA provide multiple can with the ability of GSM network interworking.By these abilities are provided, many-RAT terminal (as, dual-mode cellular telephone) of not only having supported W-CDMA but also having supported GSM just can be manufactured come out and is used by the user, all utilizes same terminal with the operational advantage that obtains W-CDMA and the covering advantage of GSM.
In order to support the more seamless operation with the W-CDMA network, for GSM has defined additional performance and specified these performances in the version of 99 years versions of GSM standard.One of them of these additional properties is that the GSM network can be the ability of adjacent W-CDMA cell broadcast information.This broadcast message makes the dual-mode terminal of working in the GSM network recognize the existence of W-CDMA sub-district.In addition, this broadcast message comprises cell-specific information, and dual-mode terminal can utilize this information to obtain the W-CDMA sub-district rapidly.For each W-CDMA sub-district, such cell-specific information comprises, frequency that use (1) W-CDMA sub-district and basic scrambler, and whether (2) this W-CDMA sub-district has used diversity mode.
Each provides " sub-district an is reselected " process W-CDMA and GSM, and the terminal of working on a kind of network is determined a proper cell in another network thus, and wherein this terminal plans to receive available service from this another network." sub-district " can refer to the base station in the network and/or the overlay area of this base station, depends on the context that this term uses.Cell reselection procedure is carried out during for idle pulley in terminal, even like this environment change of this terminal (as, because the change of the mobile or channel conditions of terminal), this terminal also can monitor the network that inserts paging and can prepare to initiate when the user wishes and connect.
Dual-mode terminal energy measurement GSM neighbor cell and W-CDMA neighbor cell are to determine the optimum subdistrict of " preemption (camp) ".If the current preemption of dual-mode terminal GSM sub-district so can be based on measuring the W-CDMA neighbor cell by the cell-specific information of GSM Cell Broadcast CB.A W-CDMA sub-district is arranged than current GSM sub-district grade height if measurement and sub-district are reselected program display, this terminal can switch to the W-CDMA pattern and preempt better W-CDMA sub-district so.
Current, the 97 years versions of the GSM network support GSM standard of major applications or the version of 98 years versions.The mode that defines in the version of 99 years versions that these GSM networks can not be by GSM standard is adjacent W-CDMA cell broadcast information.In the GSM network of " 1999 before version " (just, supporting the network of the version more more Zao) than 99 years versions the dual-mode terminal of work may not know adjacent W-CDMA sub-district also therefore " delay " on the GSM network.
Therefore this area need a kind of technology be 99 years GSM network support sub-district reselecting from GSM to W-CDMA before the versions.
Summary of the invention
Here provide multiple technologies to support sub-district reselecting from GSM to W-CDMA.These technology do not need functional (just, not the relying on the broadcast message of adjacent W-CDMA sub-district) of 99 years versions in the GSM network.These technology allow dual-mode terminal to carry out in the configuration with GSM network of issue before 99 years to reselect to the sub-district of W-CDMA sub-district from the GSM sub-district.
Dual-mode terminal determines whether the GSM network of its current preemption supports functional (just, the supporting the 99 years versions or the later version of GSM standard) of 99 years versions.Setting and/or other user's available information of some mode bit are made in the message that should determine to transmit on down link based on the GSM network.If this terminal thinks that current GSM network do not support the functional of 99 years versions, then terminal can start the search to the W-CDMA sub-district.
This terminal also can be determined the scope of W-CDMA search and when carry out the W-CDMA search based on the information of this terminal storage.The scope of W-CDMA search can be determined based on the W-CDMA network data base of being safeguarded by terminal.This database can comprise, for example, the internetwork contact of GSM network and W-CDMA, wherein this contact can be by determining the operation of these networks in the past.W-CDMA search can be carried out in the time of an appointment, this fixed time can based on, for example, carry out the scope of search, the life-span of the information of using for search, or the like such difference consider to determine.Reselecting from GSM to W-CDMA can be based on the measurement that obtains from W-CDMA search and other for information about, and for example, the threshold value that is used to compare and measure is finished.The various details that are used for Cell searching and reselect are below described.
Generally speaking, sub-district described herein is reselected technology and can be used between any two kinds of networks carrying out the sub-district and reselect, and in these two networks, first network (for example, the GSM network) some versions are not second network (for example, W-CDMA network) broadcasting adjacent cell information.So when adjacent cell information during, determine whether to search for sub-district in second network with some other devices not by first Web broadcast.
Below different aspect of the present invention and embodiment will be described in more detail.
Description of drawings
Connection with figures, by the detailed description of following elaboration, it is more clear that feature of the present invention, essence and advantage will become, and in the accompanying drawing, similar reference symbol is represented corresponding part all the time, wherein:
Figure 1A to Fig. 1 C has shown three kinds of different application to the PLMN of GREAN that comprises different released versions and UTRAN;
Fig. 2 is a flow chart, shown to carry out the process that the sub-district is reselected from GSM to W-CDMA, and it does not need the functional of 99 years versions;
Fig. 3 illustrates the block diagram of a terminal; With
Fig. 4 illustrates the block diagram of a controller in the terminal.
Embodiment
Speech used herein " exemplary " means " as an embodiment, illustration or explanation ".Here any execution mode described as " exemplary " or design is not necessarily than other execution mode or design preferred or more favourable.
Figure 1A has shown the schematic diagram of a public land mobile net network (PLMN) 100a, and this network comprises GSM EDGE Radio Access Network network (GERAN) 110a and a Universal Terrestrial Radio Access Network network (UTRAN) 120a.GERAN 110a is a GSM network, in the present embodiment, and 99 years versions of this network support GSM standard or later version.UTRAN120a is a W-CDMA network, in the present embodiment, and 99 years versions of this network support W-CDMA standard or later version.(first version that 99 years versions are the W-CDMA standards.) for the sake of simplicity, from Figure 1A to 1C in, the application standard of sign " 99 years versions " 99 years versions of expression or more late version, and sign " before 99 years versions " expression was than 99 years more Zao standard version of version.
In Figure 1A, GSM network and W-CDMA network are two and use different wireless access technologys (GSM and W-CDMA) but belong to the Radio Access Network of same PLMN.Air communication in the Radio Access Network network enabled between terminal and base station.Each Radio Access Network typically comprises a plurality of sub-districts, and wherein " sub-district " can depend on the context that this term uses and refer to base station and/or its coverage.
The two links the 130a of a mobile switching centre (MSC) and GERAN 110a and UTRAN 120a and supports these two internetwork communicate by letter and mutual.MSC 130a carries out the function of Non-Access Stratum (NAS), such as the call state management, and the mobility support, or the like.In this embodiment, MSC 130a supports 99 years versions of Non-Access Stratum agreement and MAP (MAP) standard or a version of renewal, this standard declaration allow the wireless network protocol of roaming and high-level service.MAP is used for GSM and W-CDMA network of network agreement, and ANSI-41 is the map network agreement that is used for IS-95 and IS-2000 network.
The network configuration that Figure 1A shows has supports their all-network entities of the version of 99 years versions of standard or renewal separately.Dual-mode terminal 150a just can receive service from UTRAN 120a again from GERAN 110a so.When working on GERAN 110a, if when the W-CDMA sub-district is higher than the grade of GSM sub-district, then terminal 150a can receive the broadcast message about adjacent W-CDMA sub-district, and the sub-district that can carry out this W-CDMA sub-district is reselected.For the version of 99 years versions and renewal, GSM reselects to the W-CDMA sub-district that program is defined within the application standard and is well known in the art.
Figure 1B has shown a schematic diagram that comprises the PLMN100b of GREAN 110b and UTRAN 120b.In this embodiment, GREAN 110b supports () the version for example, 97 years versions or 98 years versions, and UTRAN 120b supports the 99 years versions of W-CDMA standard or the version of renewal before 99 years versions of GSM standard.MSC 130b and GREAN 110b and UTRAN 120b link the two, and support the 99 years versions of MAP standard or the version of renewal.
For the network configuration shown in Figure 1B, GREAN 110b be not adjacent W-CDMA Cell Broadcast CB for information about, wherein this information can be used to search for these W-CDMA sub-districts by dual-mode terminal 150b.Reselect with regard to the sub-district that needs some other mechanism to carry out from GSM to W-CDMA so.
Fig. 1 C has shown a schematic diagram that comprises the PLMN 100c of GREAN 110c and UTRAN 120c.In this embodiment, GREAN 110c also supports the version before 99 years versions of GSM standard, and UTRAN 120c supports the 99 years versions of W-CDMA standard or the version of renewal.MSC130c and GREAN 110c link, and can support the MAP standard any version (for example, 97 years versions, 99 years versions, or the like).MSC130d and UTRAN 120c link, and support the 99 years versions of MAP standard or the version of renewal.Although GREAN 110c and UTRAN 120c do not link with same MSC, dual-mode terminal 150c still can receive service from GREAN 110c and UTRAN 120c.
For the network configuration shown in Fig. 1 C, GREAN 110c can not used to search for the information of these W-CDMA sub-districts by dual-mode terminal 150c for adjacent W-CDMA Cell Broadcast CB yet.Again, the sub-district that some other mechanism of needs are carried out from GSM to W-CDMA is reselected.
Provide technology at this, do not required in the GSM network the functional of 99 years versions to support sub-district from GSM to W-CDMA to reselect.These technology can be advantageously used in and have the GSM network of network configuration before the version in 99 years, those shown in Figure 1B and 1C.These network configuration can be multiple former thereby generation.As mentioned above, the present version of 97 editions of the GSM network support GSM standard of most of configuration or 98 years versions (just, 99 years version before).Desired configuration W-CDMA network of network operator will be finally their GSM network upgrade to the 99 year version or the version of renewal, and these GSM networks have new functional more seamless operation of crossing over GSM and W-CDMA with support like this.Yet, because configuration W-CDMA network needs considerable fund, unless this upgrading is necessary that definitely network operator may select to save the expense of their GSM network of upgrading.In addition, even will carry out this upgrading, also will need the regular hour to realize this upgrading.This just has one period transition period, and the GSM network in this period before some perhaps many 99 years version is not also upgraded, and can not have the functional of 99 years versions.
Sub-district described herein is reselected technology and is allowed dual-mode terminal to carry out the sub-district in the configuration with 99 years GSM networks before the version to reselect.These technology also can advantageously be avoided the situation of dual-mode terminal " stagnation " in the GSM network before 99 years versions.If dual-mode terminal is worked on a W-CDMA sub-district at first, when reselecting program and reselect to the GSM sub-district according to the sub-district of W-CDMA definition then, this situation just may take place.If this GSM sub-district does not support that 99 years versions are functional, this dual-mode terminal may not known adjacent W-CDMA sub-district and may be stuck in subsequently on the GSM network so.This situation takes place possibly, if especially terminal is a situation about moving and move around network.
Fig. 2 has shown the flow chart of process 200, and the sub-district that process 200 is used to carry out from GSM to W-CDMA is reselected, and this process does not need 99 years versions functional.If this terminal preempts a GSM sub-district in the GSM network at present, process 200 just can be carried out by a dual-mode terminal.
At first, this terminal determines whether this GSM network supports 99 years versions functional (step 212).This is determined and can be undertaken by the different modes that describes below.For example, setting and/or obtainable other information of this terminal of certain mode bit are carried out in this message of determining to transmit on down link based on this GSM network.
If determined functional (just, the answer of step 214 is for being) of 99 years versions of this GSM network support, this terminal can be carried out Cell searching and reselect (step 216) according to 99 years versions of standard or the program of upgrading version definition so.This terminal can receive from the broadcast message of GSM sub-district and obtain adjacent W-CDMA sub-district for information about, and can use these W-CDMA sub-districts of this information search.
Otherwise, if the answer of step 214 is that the sub-district that can utilize selectable program to carry out from GSM to W-CDMA is not reselected so.But for the first of this option program, the information (step 220) of the adjacent W-CDMA sub-district that acquisition will be searched for.As described below, this information can be stored in the interior nonvolatile memory of terminal.Terminal determines when and carries out this W-CDMA search (step 222) then.As described below, no matter when the GSM sub-district is searched, the W-CDMA sub-district can be searched to or the W-CDMA sub-district can be on a higher frequency speed or lower frequency speed searched arriving.
In the fixed time that step 222 is determined, this terminal utilizes the information that obtains in the step 220 to carry out search (step 224) to the W-CDMA sub-district.Also can be in this time search GSM sub-district.One finishes this search, and this terminal is just based on to the measurement of W-CDMA sub-district with find the optimum subdistrict (step 226) of possible GSM cell selecting preemption in this search.If this optimum subdistrict is different from the current GSM sub-district, this terminal just switches to and preempts this new optimum subdistrict up to search next time so.From step 216 to step 226, this process finishes.Process 200 has showed GSM and has reselected one of program to the W-CDMA sub-district repeatedly, and can or carry out when calling by terminal periodic ground.
In essence, step 212 determines whether to search for the W-CDMA sub-district, and step 220 is determined search which type of W-CDMA network (just, the scope of search), and step 222 determines when that carrying out W-CDMA searches for.This W-CDMA search is carried out based on the information that obtains in the step 220 and in the fixed time that step 222 is determined in step 224.Step 212 and step 220 will be described below in more detail to step 226.
1. whether search for the W-CDMA sub-district
Multiple operative scenario may need to determine whether to search for the W-CDMA sub-district.For example, this terminal may just preempt a GSM sub-district, and one of expectation search may be than better W-CDMA sub-district, current GSM sub-district, unless know and do not have adjacent W-CDMA sub-district.As another embodiment, this terminal may just power up and the last network of this terminal reception service or preemption may be a GSM network.If like this, may wish when powering up, to search for W-CDMA sub-district on that network.As another example, this terminal may have been lost coverage when a GSM network work, and when this terminal received coverage once more, it may want to search for the W-CDMA sub-district once more.
Usually, different information can be used for determining whether searching for the W-CDMA sub-district according to operative scenario.Do not support that 99 years versions are functional and can not be adjacent W-CDMA cell broadcast information if determine the GSM network (just, current GSM network) of the current preemption of this terminal, then may carry out a W-CDMA search.If interrelating, current GSM network and a W-CDMA network also can carry out a W-CDMA search.If one powers up or enter coverage, the access technology of the last use of the PLMN that is used to register is defined as a GSM network, and this network determines it is versions before 99 years versions, then also can carry out a W-CDMA search.Also can carry out the W-CDMA search, and can determine whether to carry out this search, and these all within the scope of the present invention based on out of Memory for other operative scenario.
Determine whether current GSM network supports 99 years functional can being undertaken by different modes of version.The GSM network is not supported the existence that the functional fact of version can not prove absolutely the W-CDMA sub-district in 99 years.Yet,,, just can carry out a W-CDMA search if think that current GSM network is 99 years versions before the versions because may there be the W-CDMA sub-district of not broadcasted by 99 years versions GSM network in the past.
This terminal can determine whether current GSM network supports the functional of 99 years versions based on the message that receives from the GSM network.99 years version version definition of GSM MSC issue (MSCR) position, the setting as following of this position:
. " 0 "=MSC be 98 years versions or older version and
. " 1 "=MSC is the version of 99 years versions or renewal.
The MSCR position is included in the information element of the control channel description of carrying in the message of system information type 3.This message is gone up at broadcast channel (BCCH) by each sub-district in this GSM network and sends, so that the out of Memory of cell ID and relevant this sub-district to be provided.The detailed procedure that how to use the MSCR position has been described in file 3GPP TS24.007.This file and other 3GPP that lists here and GSM file can openly obtain.
This terminal can monitor the MSCR position in the message of the system information type 3 that receives, and if this position be not provided with and can think that current GSM network do not support that 99 years versions are functional.The released version of this MSC has been indicated in this MSCR position.Yet this MSCR position is provided with by the base station that transmission comprises this message.This MSCR position can only be provided with by base station and the network of supporting 99 years versions or upgraded edition.Like this, if this MSCR position is set up, 99 years versions of this GSM network support is functional so.On the contrary, if this MSCR position is not set up, can think that so this GSM network do not support the functional of 99 years versions
The GSM of 99 years versions has also defined a SGSN issue (SGSNR) position, following setting:
. " 0 "=SGSN be 98 years versions or older version and
. " 1 "=SGSN is the version of 99 years versions or renewal.
GPRS Support Node (GSN) is a network entity that mobile management and packet data interface are provided to external network (as, internet).The corresponding MSC of GSN also is packet data service execution Non-Access Stratum function.A Serving GPRS Support Node (SGSN) is the GSN that serves a terminal at present.The SGSNR position is included in the information element of system information 13 all the other eight bit bytes, carry in the message of the system information type 13 that this information element sends on BCCH, also in the message of the packet system information Class1 that a packet broadcast channel (PBCCH) upward sends, carry.This terminal can monitor the system information type 13 that receives or the SGSNR position in the packet system information Class1 message, and if this position and be not provided with, can be sure of that this GSM network do not support that 99 years versions are functional.The released version that SGSNR position indication SGSN supports, but this position also is provided with by the base station.Like this, similar with the MSCR position, if the SGSNR position is not set up, can suppose that so this GSM network do not support the functional of 99 years versions.
The information element of MSCR position, control channel description and the message of system information type 3 are described in file 3GPP TS04.18,9.1.35 and 10.5.2.11 joint.The SGSNR position, the information element of system information 13 all the other eight bit bytes and the message of system information type 13 are described in the 9.1.43a of 3GPP TS04.18 and 10.5.2.37b joint.The message of packet system information Class1 is described in the 11.2.18 joint at file GSM 04.60.
This terminal also can start the search to the W-CDMA sub-district based on the information in the database of this terminal maintenance.This database can comprise W-CDMA and the GSM network that this terminal past attempts preempted.The GSM network can interrelate with the W-CDMA network, and this contact also can be stored in the database.For example, the GSM network of network ID that interrelates with the W-CDMA network can be stored in this database.If there is current GSM network of network ID in the database, the information of the so relevant W-CDMA network that interrelates just can be used to carry out the W-CDMA search.Like this, the information in the database can be used by this terminal, and wherein, this information is inferred even without the broadcast message that receives these sub-districts also to have adjacent W-CDMA sub-district just as receiving from this GSM network like this.
This terminal also can be based upon last PLMN that this terminal registers and canned data starts the search to the W-CDMA sub-district.This terminal also can be the information stores of the access technology of the used last use of registered PLMN (RPLMN) at a constituent instruments EF
RPLMNAcTIn, this document is stored in a GSM subscriber identification module (SIM) or the USIM (USIM).This document has comprised an access technology territory, and this territory has comprised the information of the last access technology (for example, before the outage or before losing coverage) that is used for this terminal and uses.If determine that GSM is that last access technology is (based on constituent instruments EF
RPLMNAcTIn information) and (randomly) if think that this GSM network is the versions (based on some out of Memory) before 99 years versions, this terminal just can start a W-CDMA and searches for (for example, powering up or enter coverage) so.The constituent instruments EF that is used for USIM
RPLMNAcTAt file 3GPPTS 31.102, described in the 4.2.56 joint.
2. what is searched for
Do not support that 99 years versions are functional if determined the GSM network, this terminal just can replace broadcast from the GSM network for information about from what another information source obtained to carry out a W-CDMA search so.In one embodiment, terminal some information of the W-CDMA network storage in nonvolatile memory for preempting before each its.For the information of each W-CDMA network storage can comprise, for example, following:
W-CDMA network of network ID;
The cover frequency that use W-CDMA sub-district on the W-CDMA network; With
The basic scrambler of a cover that use W-CDMA sub-district on the W-CDMA network.Canned data can be used to carry out or quicken search to the W-CDMA sub-district.
Because memory space may be the important cost part of a terminal, the canned data amount can be maintained to a little quantity to reduce demand to memory.Terminal can be any one or the combination in any in the above-named information of each W-CDMA network storage like this, or some out of Memory.Canned data also may wear out, so just abandons outmoded information from memory.For example, if terminal in a specific W-CDMA network one specific period (for example, specified quantitative hour or fate) no longer work, the information of this network just can be deleted from memory so.But the frequency of W-CDMA search can be determined based on the life-span and/or the quantity of acquired information as described below.
This terminal also can be stored the contact (mapping just) of GSM network and W-CDMA network.This contact can be used for limiting the scope of W-CDMA search.In one embodiment, this terminal only with the associated W-CDMA network of current GSM network in search W-CDMA sub-district.In another embodiment, this terminal is the nearest minority GSM sub-district storage W-CDMA neighbor cell of terminal preemption.This contact can be stored in the neighbor lists into each these nearest GSM cell maintenance, sets up when wherein each neighbor lists can be carried out reselecting from GSM to W-CDMA by this terminal.This terminal can only be searched for the associated W-CDMA sub-district, GSM sub-district of those and its current preemption then.
Usually, be the W-CDMA network that to search for and sub-district stored information imperative not.If information can be used, so a less search volume (for example, the frequency of limited quantity and scrambler) carried out " a concentrating " search.Can not use if having information for the W-CDMA network, can carry out so one widely or the search that enlarges come for finding more W-CDMA frequency of W-CDMA Cell searching and/or scrambler.Also can carry out one and search for all possible W-CDMA frequency and all possible scrambler completely.
Canned data can quicken the W-CDMA search procedure and shorten search time (just, make and concentrate search to be performed).Yet even this information is available, also can regularly carrying out one, search for widely or completely may be by the W-CDMA sub-district of terminal know (for example, if terminal has moved to a new zone).
3. when search for
The a plurality of PLMN of network operator possible configuration, wherein each all covers specific zone.Each PLMN can identify by the combination of a unique Mobile Country Code MCC (MCC) and Mobile Network Code (MNC).For each user, one of them PLMN is designated as Home PLMN (HPLMN) and be used for the MCC of PLMN and SIM or the USIM that MNC is stored in the user.If terminal has preempted ownership MCC and the unmatched PLMN of MNC that stores among its MCC and MNC and SIM or the USIM, this PLMN is considered to an accessed PLMN (VPLMN) so.
W-CDMA has defined a mechanism, regularly attempts obtaining its HPLMN or the service on the higher priority PLMN in the terminal of working on the VPLMN thus.This mechanism is called as HPLMN background search mechanisms and describes in the 4.4.3.3 of file 3GPP TS 23.122 joint.If this terminal is being roamed and is being in idle pulley, then regularly carry out the search of HPLMN background.The search of the one HPLMN background powers up between back 2 minutes to T minute in this terminal and carries out, and each background search was subsequently carried out in background search back before in T minute.The value of parameter T can and be stored in a constituent instruments EF by the network operator configuration
HPLMNIn, this document is stored among a SIM or the USIM.If do not specify a value, so just used a default value 60 minutes for this background search to T.The constituent instruments EF that is used for SIM
HPLMNIn the 4.2.6 of file 3GPP TS31.102 joint, described
Search W-CDMA can regularly carry out with the time interval of rule the sub-district.In one embodiment, W-CDMA search can be automatically performed by terminal, carries out HPLMN background search (just, every T minute, except the background search first time from 2 minutes to T minute after powering up) simultaneously.In another embodiment, W-CDMA search can with less than or carry out greater than T minute the time interval.Duration between the W-CDMA search can be used parameter T
WCDMARepresent, this parameter can for terminal storage in nonvolatile memory.For the time period between the W-CDMA search is used an independent T
WCDMAParameter allows this terminal to carry out the W-CDMA search with the frequency of hope.
T
WCDMAThe value of parameter can be disposed by network operator, is manually selected by the user, perhaps determines with certain alternate manner.In addition, T
WCDMAValue can be a fixed value or the whole value of dynamic adjustable.For example, the frequency of W-CDMA search can depend on that (1) is stored in the life-span that is used for the information of W-CDMA network in the nonvolatile memory of terminal, and (2) to W-CDMA network information available amount, (3) some other factorses, or (4) combination in any wherein.T
WCDMAValue also can obtain based on W-CDMA information.For example, W-CDMA has defined a kind of system parameters (S search, GSM), it has determined when the signal strength signal intensity search based on the W-CDMA sub-district of service.This W-CDMA system parameters can be mapped to T
WCDMAValue.
The W-CDMA search also can only be carried out when being called, but not automatically performs.For example, can no matter when the user carry out this search when starting the W-CDMA search.As another embodiment,, then can carry out the W-CDMA search if this terminal enters coverage after the coverage that has lost last GSM network.
4.W-CDMA search
Search W-CDMA can carry out in the time of appointment and can carry out in a different manner in the sub-district.In one embodiment, this terminal is searched for the W-CDMA sub-district in HPLMN and among the service PLMN.W-CDMA search can the mode identical with HPLMN background search (appointment in 3GPP TS23.122) be carried out, but uses the possible expansion PLMN tabulation that comprises service PLMN.In addition, although HPLMN background search designated execution the when terminal is arranged in a VPLMN, when this terminal preempted sub-district among this HPLMN, the W-CDMA search also was performed.
Can be based upon the information and executing W-CDMA search that adjacent W-CDMA sub-district obtains.This information can narrow down to a specified frequency and scrambler space to the scope of search.As mentioned above, if this information can not obtain, can carry out one widely/search or a search completely of enlarging, even perhaps this information can obtain, also usually carry out such search.
This terminal can or cannot be carried out simultaneously to the search of GSM sub-district with to the search of W-CDMA sub-district.Can carry out GSM searches for and seeks one than better GSM sub-district, current GSM sub-district.No matter when the search of HPLMN background can be carried out the GSM search when being performed, and the frequency at its place can be identical or different with the frequency of W-CDMA search.
5.GSM the sub-district to W-CDMA is reselected
When W-CDMA search finished, this terminal may obtain the measurement of one group of W-CDMA sub-district that this search is found.Also can carry out the GSM search in the W-CDMA search, in this case, this terminal can obtain another group of the GSM sub-district of finding in the GSM search is measured.These measurements may relate to the ratio (Ec/No) of every chip institute energy requirement to total noise (Energy-per-chip-to-total-noise), received signal code power (RSCP), or some other measurements of signal quality.Then, the measurement that obtains for W-CDMA sub-district, non-service GSM sub-district and current GSM sub-district can be used to carry out the sub-district and reselects.
Being used for carrying out the algorithm reselected of sub-district from GSM to W-CDMA is described at the 6.6.5 of file 3GPPTS 05.08 joint.For this algorithm, this terminal reselects to a suitable W-CDMA sub-district, if (1) the RSCP value of surveying of W-CDMA sub-district surpasses a specific offset threshold (XXX_Qoffset) than those values of current GSM sub-district and suitable GSM sub-district, and continued 5 seconds fixed time section, wherein XXX represents other access technology/pattern, (2) have Frequency Division Duplexing (FDD) (FDD) system of the frequency band that separates for a down link and up link, the Ec/No value of having surveyed of W-CDMA sub-district has surpassed a specific minimum Ec/No threshold value (FDD_Qmin).Described XXX_Qoffset and FDD_Qmin are broadcasted on broadcast channel by the GSM sub-district, as the part of gsm system information.
If because the functional of 99 years versions do not supported in the current GSM sub-district, and from broadcast message, can not get XXX_Qoffset and FDD_Qmin threshold value, can obtain these threshold values by alternate manner so.In one embodiment, these threshold values can be configured and be stored in the nonvolatile memory of terminal for this terminal.In another embodiment, this threshold value can be left in the basket or can based on terminal can with out of Memory calculate.For example, can ignore minimum Ec/No threshold value (FDD_Qmin) and from the W-CDMA offset information, calculate offset threshold (XXX_Qoffset).For example, the W-CDMA offset information can be from the W-CDMA network before the preemption of this terminal (just, receiving by terminal via broadcast channel), from safeguarding the database that is used for the W-CDMA network by this terminal, or the like in obtain.Usually, threshold X XX_Qoffset and FDD_Qmin are selected such that this terminal can not reselect to the W-CDMA sub-district, and then, the result as W-CDMA reselects program reselects go back to a GSM sub-district soon.
Being used for carrying out the algorithm of reselecting the sub-district from W-CDMA to GSM is described at the 5.2.6.1.4 of file 3GPPTS 25.304 joint.In this algorithm, this terminal is based on the comparison to the signal strength measurement of Serving cell and neighbor cell, and as the hysteresis and the deviant of the part broadcasting of W-CDMA system information, reselects a suitable GSM sub-district.
Fig. 3 has shown the block diagram of terminal 150x, and this terminal 150x can realize the technology that GSM described here reselects to W-CDMA.
On down link, antenna 312 receives from the down link signal of a plurality of base stations (for easy, only having shown a base station 104x among Fig. 3) transmission of GSM and/or W-CDMA sub-district.The signal that receives from antenna 312 is provided for an acceptor unit (RCVR) 314 and is conditioned (for example, filtration, amplification, frequency down conversion, and digitlization), so that data sample to be provided.Demodulator (Demod) 316 depends on the access technology of the sub-district that is regaining then, based on GSM and/or W-CDMA physical layer process process demodulating data sample.Decoder 318 further the data decode after the demodulation so that decoded data to be provided, these data can comprise the broadcast message of user's specific data and/or GSM and W-CDMA cell transmission.User's specific data that has regained and/or broadcast message can be provided for controller 320 and/or non-volatile (NV) memory cell 322.
On up link, data that this terminal will send and message (for example, in order to be registered to the W-CDMA sub-district of reselecting) are provided for an encoder 342, and this encoder formats this data and encodes.The modulated then device 344 of coded data/message is modulated and is further regulated so that a uplink signal to be provided by transmitter unit (TMTR) 346, and this signal is transmitted go back to the base station of the GSM sub-district of the current preemption of this terminal then.This base station receives also handles uplink signal, regaining the data that this terminal sends, and the 130x of this forwards to one mobile switching centre (MSC) can be used for further processing.
Fig. 4 has shown the block diagram that can support the controller 320x that GSM reselects to W-CDMA.Controller 320x can be an execution mode of controller 320 or also can realize in controller 320.Execution mode hereto, controller 320x has comprised determining unit 410, control unit 420 and has reselected unit 430.
Determining unit 410 reception information, this information are used for determining whether the GSM network of the current preemption of this terminal supports the version before 99 years versions of GSM standard.This information can comprise, for example, (1) broadcast message, for example, the message of the system information type 3 that is received from the current GSM sub-district, the message of the message of system information type 13 or packet system information Class1, (2) W-CDMA network information, for example, from memory cell 322, and/or (3) can be used to determine whether carry out some out of Memory of W-CDMA search, for example, and in the access technology of the last use that is used for the constituent instruments of RPLMN (EF).Unit 410 provides the indication whether current GSM network be considered to support the version before 99 years of GSM standard (just, to the search or the indication of not searching for the W-CDMA sub-district).
The W-CDMA search also can be according to carrying out from the craft input of display and 340 receptions of I/O (I/O) unit.The result of this search and/or the sub-district of reselecting also can be shown to the user by unit 340.
For clear, the technology of supporting that GSM reselects to W-CDMA of being used to has been described here.The sub-district that these technology also can be used to be supported between other type network is reselected, for example, from GSM to IS-2000, from IS-95 to IS-2000, from IS-95 to W-CDMA, or the like.Usually, these technology can be used for any two kinds of internetwork sub-districts to be reselected, and in these two kinds of networks, some released versions of first kind of network (for example, GSM network) are not neighbor cell broadcast message in second kind of network (for example, W-CDMA network).(later release of this first kind of network may or may not be a neighbor cell broadcast message in this second kind of network.) when this first kind of network do not broadcasted the information of neighbor cell, utilize some other devices to determine whether to search for sub-district in second network.Like this, here, " GSM reselects to W-CDMA " mentioned the also sub-district between the cordless communication network of other type of ordinary representation reselected.
Can realize that sub-district described herein reselects technology by different devices.For instance, these technology can realize by hardware, software or the combination of the two.Realize for hardware, be used to support element that sub-district described here reselects (for example, unit 410,420 and 430 among Fig. 4) can carry out other electronic unit of function described herein in one or more application-specific integrated circuit (ASIC)s (ASIC), digital signal processor (DSP), digital signal processor spare (DSPD), programmable logic device (PLD), field programmable gate array (FPGA), processor, controller, microcontroller, microprocessor, design, or realize in the combination of above device.
Realize that for software sub-district described herein is reselected technology and can be utilized the module (for example, program, function or the like) of carrying out function described herein to realize.Software code can be stored in the memory cell (for example, the memory cell among Fig. 3 322) and be carried out by a processor (for example, controller 320).Memory cell can be at processor with interior or with external realization, and under this kind situation, memory cell can be connected to this processor communicatedly via different device well known in the prior art.
Be used for reference and help some problem of location at this title that comprises.These titles are not limited in its concept and range of describing down, and these notions go for running through the other parts of whole specification.
The foregoing description that open execution mode is provided is to be used to making any those skilled in the art can make or use the present invention.Modification to these execution modes will be significantly for those skilled in the art, and the basic principle of definition here can be used for other execution mode and can not break away from the spirit and scope of the present invention.Like this, the present invention is not limited in the execution mode that illustrates here, and consistent with the widest scope of purport disclosed herein and novel features.
Claims (25)
1. can operate the wireless device of carrying out from the GSM network to cdma network of reselecting for one kind, comprise:
Can operate to determine whether described GSM network supports the version order unit really before 99 years versions of GSM standard;
If think version before 99 years versions of described GSM network support GSM standard, then can operate the control unit that starts the search of CDMA sub-district; With
Be used for obtaining to search for the device of the used information in CDMA sub-district, and wherein the described search of CDMA sub-district carried out according to the information of described acquisition.
2. equipment as claimed in claim 1, wherein said determining unit can be operated and determine based on the broadcast that receives from described GSM network whether described GSM network supports the version before 99 years versions of GSM standard.
3. equipment as claimed in claim 1, wherein said determining unit can operate that to come based on described equipment be that the information of the described GSM network storage determines whether described GSM network supports the version before 99 years versions of GSM standard.
4. equipment as claimed in claim 1, if wherein being used for a constituent instruments indication GSM of the public land mobile net network (RPLMN) of last registration is the last access technology of using, then described control unit can be operated and start a search to the CDMA sub-district.
5. equipment as claimed in claim 1 further comprises:
Memory cell, it can be operated and store the information relevant with cdma network with the GSM network, and wherein said determining unit can be operated and determined based on the information relevant with cdma network with the GSM network whether described GSM network supports the version before 99 years versions of GSM standard.
6. equipment as claimed in claim 1 further comprises:
Can operate the memory cell of storing the information that is used to search for the CDMA sub-district, and wherein search for the CDMA sub-district according to the information that obtains from described memory cell.
7. equipment as claimed in claim 6, wherein said memory cell can be operated the sign of storing cdma network, the frequency of CDMA sub-district use and the scrambler that use the CDMA sub-district, or combination in any wherein.
8. equipment as claimed in claim 6, the described information that wherein is stored in the described memory cell is to obtain from the CDMA sub-district that described equipment was worked in the past.
9. equipment as claimed in claim 6, wherein said memory cell can be operated and store the information relevant with the GSM network with cdma network, and wherein described GSM network are depended in the described search of CDMA sub-district.
10. equipment as claimed in claim 1, wherein said control unit can be operated the thorough search that starts the CDMA sub-district.
11. equipment as claimed in claim 1, wherein said control unit further can operate to determine the special time of search CDMA sub-district.
12. equipment as claimed in claim 11, the special time of wherein carrying out search CDMA sub-district are determined based on the time period of appointment between the continuous background search in ownership public land mobile net network (HPLMN).
13. equipment as claimed in claim 11 is wherein carried out the special time of search CDMA sub-district and is determined based on the time period of an appointment between the continuous CDMA search.
14. equipment as claimed in claim 1, wherein said control unit further can be operated to receive from the search to the CDMA sub-district and measure, and determine whether to reselect to a CDMA sub-district based on described measurement.
15. whether equipment as claimed in claim 14 wherein reselects to the offset threshold based on the measurement that is used for comparison GSM sub-district and CDMA sub-district determined further of a CDMA sub-district.
16. deriving from, equipment as claimed in claim 15, wherein said offset threshold is used for the side-play amount reselected to described GSM network from described cdma network.
17. equipment as claimed in claim 1, wherein said cdma network are the W-CDMA networks.
18. equipment as claimed in claim 1, wherein said cdma network are the IS-2000 networks.
19. can operate the integrated circuit of supporting from the GSM network to cdma network of reselecting for one kind, it comprises:
Can operate to determine whether described GSM network supports the version order unit really before 99 years versions of GSM standard;
If think version before 99 years versions of described GSM network support GSM standard, then can operate the control unit that starts the search of CDMA sub-district; With
Be used for obtaining to search for the device of the used information in CDMA sub-district, and wherein the described search of CDMA sub-district carried out according to the information of described acquisition.
20. integrated circuit as claimed in claim 19, wherein said cdma network are the W-CDMA network.
21. a device, it can be operated to support reselecting from the GSM network to cdma network, comprising:
Be used for determining whether described GSM network supports the device of 99 years versions version in the past of GSM standard;
If think version before 99 years versions of described GSM network support GSM standard, then be used for starting the device of CDMA Cell searching; With
Be used for obtaining to search for the device of the used information in CDMA sub-district, and wherein the described search of CDMA sub-district carried out according to the information of described acquisition.
22. device as claimed in claim 21 further comprises:
Be used for determining to carry out the device of the special time of searching for the CDMA sub-district, and wherein the described search of CDMA sub-district carried out at described special time.
23. device as claimed in claim 21, wherein said cdma network are the W-CDMA networks.
24. the method reselected of an execution from the GSM network to cdma network comprises:
Determine whether described GSM network supports 99 years versions version in the past of GSM standard;
If think version before 99 years versions of described GSM network support GSM standard, then start search to the CDMA sub-district; With
Acquisition is used to search for the information of CDMA sub-district, and wherein, described search is carried out according to the information that obtains.
25. method as claimed in claim 24, wherein said cdma network are the W-CDMA network.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US43132202P | 2002-12-06 | 2002-12-06 | |
| US60/431,322 | 2002-12-06 | ||
| US10/383,793 | 2003-03-06 |
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| CN101390434B (en) * | 2006-02-22 | 2012-07-18 | 日本电气株式会社 | Portable telephone communication system, communication control method |
| US8175592B2 (en) * | 2008-10-20 | 2012-05-08 | Qualcomm Incorporated | Wireless network search |
| KR101333975B1 (en) * | 2009-06-15 | 2013-11-27 | 후지쯔 가부시끼가이샤 | Wireless communication system, base station device, terminal device, and wireless communication method in wireless communication system |
| CN103561453A (en) * | 2013-10-31 | 2014-02-05 | 宇龙计算机通信科技(深圳)有限公司 | Method for searching for LTE network and terminal |
| US9854488B2 (en) * | 2014-03-18 | 2017-12-26 | Telefonaktiebolaget Lm Ericsson (Publ) | Method and wireless communication device for idle mode mobility management |
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| Digtal cellular telecommunications system(phase2+),Mobile radio interface layer 3 specification, RadioResourceControl Protocol(3GPP TS04.18 version8.17.0 Release1999). ETSI TS 101 503 V8.17.0. 2002 |
| Digtal cellular telecommunications system(phase2+),Mobile radio interface layer 3 specification, RadioResourceControl Protocol(3GPP TS04.18 version8.17.0 Release1999). ETSI TS 101 503 V8.17.0. 2002 * |
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