CN101137215B - Method for supporting mobile terminal to move between base stations with diversity of protocol versions - Google Patents
Method for supporting mobile terminal to move between base stations with diversity of protocol versions Download PDFInfo
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Abstract
A method for supporting a mobile terminal to move between base stations with different protocol versions comprises following steps: S102, one ore more sets of dialog configuration information are negotiated by a base station controller with the mobile terminal according to types of mobile terminal protocol versions; S104, in call process, according to types of mobile terminal protocol versions, the dialog configuration information which are used by the mobile terminal and the base station protocol version type of a call cell in the mobile terminal, the base station controller determines to whether or not establish connection with the mobile terminal or control whether or not the mobile terminal switch to another more adaptive dialog configuration information; S106, in handoff process, according to types of mobile terminal protocol versions, the dialog configuration information which are used by the mobile terminal and the pilot frequency intensity relation of the base station belongingto different protocol versions in routing updating messages reported by the mobile terminal, the base station controller determines to whether or not select a part of pilot frequency to switch or firstly control whether or not the mobile terminal switch to another more adaptive dialog configuration information.
Description
Technical field
The present invention relates to the communications field, relate more specifically to a kind of method of supporting portable terminal in move between base stations with diversity of protocol versions.
Background technology
CDMA20001xEV-DO (IS-856) is a branch of CDMA standard family, and it comprises the agreement of a series of continuous evolution.Newer IS-856 protocol version not only comprises the characteristic and the function of previous version, also can be improved and increase new characteristic.In order to support new characteristic, base station system still is that portable terminal all needs to upgrade from hardware and software two aspects usually.
IS-856 version 0 and version A are two standards that this protocol suite successively occurs, and version A has bigger improvement with respect to version 0, and the enhancing of physical layer and mac-layer protocol can be supported higher preceding reverse data transmission rate, more effectively reduce inter-user interference; The enhancing of application layer protocol provides powerful guarantee for the QoS characteristic of supporting customer service; The enhancing of session-layer protocol can be supported wireless parameter configuration more flexibly, and typically, the many covers of the initial just negotiation of version A support terminal and base station system have the parameter configuration of different radio characteristic.
Obtained commercially comparatively widely based on the base station system of IS-856 version 0 and portable terminal, and many enhancing characteristics of version A also cause the concern of more and more operators, and the system upgrade of version 0 demand to version A is become day by day urgently.For base station system, base station controller only needs software upgrading usually, but base station transceiver has been owing to comprised the modem module of core, thus for physical layer the evolution protocol version of bigger variation is arranged, must the while upgrading hardware and software could support fully.But operator can allow some to exist after the whole network upgrading at the base station transceiver that can only support low protocol version on the hardware for the consideration of protection investment.Networking mode for this mixed configuration, there are the following problems: when the portable terminal with protocol version 0 when having the move between base stations of diversity of protocol versions, needing decision to adopt the wireless parameter of which kind of characteristic to dispose could be by compatible, and when the portable terminal with protocol version A moves to the lower base station of protocol version from the higher base station of protocol version, may do not supported because of signaling format or data transmission format and cause call drop by the base station, when it moves to the higher base station of protocol version from the lower base station of protocol version, may can't use various enhancing characteristics because of the restriction of wireless parameter configuration again.
In the face of the problems referred to above, following demand is conspicuous: on the one hand, the network after the upgrading not only can be admitted the terminal with higher protocol version, and can continue as the lower Terminal Service of protocol version; On the other hand, for the higher portable terminal of protocol version, when in its network when mobile in mixed configuration, network should be able to automatically instruct terminal to adopt the wireless parameter that is complementary with diversity of protocol versions to obtain higher-quality service as far as possible according to the ability of the base station transceiver of current and this terminal communication, avoids service to become unavailable and then cause call drop simultaneously again.
Summary of the invention
In view of above-mentioned one or more problems, the present invention proposes a kind of method of supporting portable terminal in move between base stations with diversity of protocol versions.
Support portable terminal according to the present invention may further comprise the steps in the method for the move between base stations with diversity of protocol versions: S102, and base station controller is consulted one or more sets session configuration informations according to the protocol version type and the portable terminal of portable terminal; S104, rise at portable terminal and to exhale in the process, base station controller is exhaled the protocol version type of base station under the sub-district according to rising of current session configuration information of enabling of protocol version type, the portable terminal of portable terminal and portable terminal, determines whether to connect with portable terminal or not controlling portable terminal switches to another set of more adaptive session configuration information; And S106, in mobile terminal switching process, the pilot frequency intensity relation that belongs to the diversity of protocol versions base station in the routing update message of base station controller according to the current session configuration information of enabling of protocol version type, the portable terminal of portable terminal, mobile terminal reporting determines whether to select a part of pilot tone to carry out switching or at first not controlling portable terminal switches to another set of more adaptive session configuration information.
Wherein, step S102 comprises: S1022, and base station controller is according to the protocol version type of the session negotiation request identification portable terminal of portable terminal; And S1024, base station controller is consulted the session configuration information that one or more sets have the different radio characteristic according to the protocol version type and the terminal of portable terminal.The session configuration information comprises following at least a information: protocol subtypes and protocol negotiation parameter that a cover all adopts IS-856 version 0 to support, protocol subtypes and consultation parameter that a cover all adopts IS-856 version A to support.
Wherein, step S104 comprises: S1042, rise under the situation of exhaling at portable terminal, base station controller is exhaled the protocol version type of cell base station according to rising of current session configuration information of enabling of portable terminal and portable terminal, determines whether directly to connect or does not utilize the public information control terminal to switch to the more adaptive session configuration information of an other cover; And S1044, determining under the situation about directly connecting, what enable is the session configuration information with IS-856 version A characteristic if portable terminal is current, the protocol version and the unmatched pilot tone of IS-856 version A of base station, portable terminal place in the routing update message of mobile terminal reporting are rejected, connected then.
Wherein, step S106 comprises: S1062, under the situation that portable terminal need switch, the pilot frequency intensity relation that belongs to the diversity of protocol versions base station in the routing update message of base station controller according to current session configuration information of enabling of protocol version type, the portable terminal of portable terminal and mobile terminal reporting, determine whether need be on dedicated channel the switching of initiation session configuration information; S1064 switches at needs under the situation of session configuration information, and portable terminal is closed connection after switching to another set of session configuration information; S1066, do not needing to switch under the situation of session configuration information, if the current session configuration information of enabling of portable terminal with IS-856 version A characteristic, then the protocol version and the unmatched pilot tone of IS-856 version A characteristic of base station, portable terminal place in the routing update message of mobile terminal reporting are rejected, switched then.The method according to this invention can be applied to cdma communication system.
By the present invention, the base station transceiver with diversity of protocol versions can coexist as in the same system, and can compatible various types of portable terminals.When terminal moves, base station system can be considered the terminal protocol version and the release type of base station transceiver of communication with it simultaneously, reducing under the prerequisite of call drop, control portable terminal as far as possible and adopt the session configuration information foundation that is complementary with higher protocol version or keep and be connected, obtain more high performance service.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Figure 1A to Fig. 1 D is a kind of flow chart of supporting portable terminal in the method and the step thereof of the move between base stations with diversity of protocol versions according to the embodiment of the invention;
Fig. 2 is a kind of according to another embodiment of the present invention schematic diagram of supporting portable terminal in the method for the move between base stations with diversity of protocol versions;
Fig. 3 is a kind of schematic diagram of supporting portable terminal in the method for the move between base stations with diversity of protocol versions according to yet another embodiment of the invention;
Fig. 4 is that the portable terminal according to the embodiment of the invention works the control flow chart when exhaling; And
Fig. 5 is the control flow chart of portable terminal in handoff procedure according to the embodiment of the invention.
Embodiment
Below with reference to accompanying drawing, describe the specific embodiment of the present invention in detail.
Referring to figs. 1A to Fig. 1 D, illustrate according to the support portable terminal of the embodiment of the invention method in move between base stations with diversity of protocol versions.Shown in Figure 1A, support that portable terminal may further comprise the steps in the method for the move between base stations with diversity of protocol versions: S102, base station controller is consulted one or more sets session configuration informations according to the protocol version type and the portable terminal of portable terminal; S104, rise at portable terminal and to exhale in the process, base station controller is exhaled the protocol version type of base station under the sub-district according to rising of current session configuration information of enabling of protocol version type, the portable terminal of portable terminal and portable terminal, determines whether to connect with portable terminal or not controlling portable terminal switches to another set of more adaptive session configuration information; And S106, in mobile terminal switching process, the pilot frequency intensity relation that belongs to the diversity of protocol versions base station in the routing update message of base station controller according to the current session configuration information of enabling of protocol version type, the portable terminal of portable terminal, mobile terminal reporting determines whether to select a part of pilot tone to carry out switching or at first not controlling portable terminal switches to another set of more adaptive session configuration information.
Shown in Figure 1B, step S102 comprises: S1022, and base station controller is according to the protocol version type of the session negotiation request identification portable terminal of portable terminal; And S1024, base station controller is consulted the session configuration information that one or more sets have the different radio characteristic according to the protocol version type and the terminal of portable terminal.The session configuration information comprises following at least a information: protocol subtypes and protocol negotiation parameter that a cover all adopts IS-856 version 0 to support, protocol subtypes and consultation parameter that a cover all adopts IS-856 version A to support.
Shown in Fig. 1 C, step S104 comprises: S1042, rise under the situation of exhaling at portable terminal, base station controller is exhaled the protocol version type of cell base station according to rising of current session configuration information of enabling of portable terminal and portable terminal, determines whether directly to connect or does not utilize the public information control terminal to switch to the more adaptive session configuration information of an other cover; And S1044, determining under the situation about directly connecting, what enable is the session configuration information with IS-856 version A characteristic if portable terminal is current, the protocol version and the unmatched pilot tone of IS-856 version A of base station, portable terminal place in the routing update message of mobile terminal reporting are rejected, connected then.
Shown in Fig. 1 D, step S106 comprises: S1062, under the situation that portable terminal need switch, the pilot frequency intensity relation that belongs to the diversity of protocol versions base station in the routing update message of base station controller according to current session configuration information of enabling of protocol version type, the portable terminal of portable terminal and mobile terminal reporting, determine whether need be on dedicated channel the switching of initiation session configuration information; S1064 switches at needs under the situation of session configuration information, and portable terminal is closed connection after switching to another set of session configuration information; S1066, do not needing to switch under the situation of session configuration information, if the current session configuration information of enabling of portable terminal with IS-856 version A characteristic, then the protocol version and the unmatched pilot tone of IS-856 version A characteristic of base station, portable terminal place in the routing update message of mobile terminal reporting are rejected, switched then.The method according to this invention can be applied to cdma communication system.
Fig. 2 is that the terminal with protocol version 0 works the enforcement illustration of exhaling and moving under network.As shown in Figure 2, the terminal with protocol version 0 may rise under the base station of supported protocol version 0 exhales (A place), also may rise under the base station of supported protocol version A and exhale (B place), may move to the zone (C place) that a plurality of base stations cover simultaneously thereafter.If terminal initial access network, base station controller can be consulted a cover with terminal and have the session configuration information of version 0 characteristic and enable this cover configuration information after negotiation is finished.After this terminal rise exhale and mobile handoff procedure in, base station controller to its control referring to Fig. 4 and flow chart shown in Figure 5.
Fig. 3 is that the terminal with protocol version A works the enforcement illustration of exhaling and moving under network.As shown in Figure 3, the terminal with protocol version A may rise under the base station of supported protocol version 0 exhales (A place), also may rise under the base station of supported protocol version A and exhale (B place), may move to the zone (C place) that a plurality of base stations cover simultaneously thereafter.If terminal initial access network, base station controller can be consulted at least two cover session configuration informations with terminal, the protocol subtypes and the protocol negotiation parameter that have at least a cover all to adopt version 0 to support, the protocol subtypes and the protocol negotiation parameter that have at least a cover all to adopt version A to support.If terminal is to rise at the A place to exhale, for the most adaptive consideration, consult to finish the back base station controller and can require to enable session configuration information with version 0 characteristic, in like manner, exhale if rise at the B place, then base station controller can require to enable the session configuration information with version A characteristic, exhales if rise at the C place, and then base station controller can require to enable the corresponding to session configuration information of protocol version with the base station, reference pilot place of terminal to report.After this terminal rise exhale and mobile handoff procedure in, base station controller to its control referring to Fig. 4 and flow chart shown in Figure 4.
Fig. 4 is that portable terminal works the control flow chart when exhaling.As shown in Figure 4, portable terminal works the process of exhaling and comprises following steps:
S402, terminal to report connects the request of foundation and routing update message;
S404, base station controller is judged the terminal protocol release type according to the session configuration information of the terminal of this locality storage, no matter consult one or more sets session configuration informations, if wherein physical layer protocol subtype is default value, judge that then this terminal is the terminal of supported protocol version 0, physical layer subtype is subtype 2 in the cover session configuration information if having at least, judges that then this terminal is the terminal of supported protocol version A;
S406, if the protocol version type of terminal is a version 0, it is constant then to keep current session configuration information, meets the pilot frequency distribution resource that adds the active set condition and continues follow-up connection building process for all of terminal to report simultaneously.Because the base station that no matter belongs to supported protocol version 0 in the pilot tone of terminal to report still belongs to the base station of supported protocol version A, can both support all characteristics of this terminal current sessions configuration fully, so pilot tone is not done difference;
S408 is if the protocol version type of terminal is version A, because this kind terminal may be consulted many cover session configuration informations, so need judge at first whether the version characteristic of the current session configuration information of enabling is consistent with it;
S410 if the version characteristic of the current session configuration information of enabling is a version 0, needs the protocol version type of having inquired about the base station transceiver of exhaling the place, sub-district;
S412, if working the protocol version type of the base station transceiver of exhaling the place, sub-district also is version 0, then keep the current sessions configuration information, and meet the pilot frequency distribution resource that adds the active set condition and continue follow-up connection building process for all of terminal to report;
S414, if working the protocol version type of the base station transceiver of exhaling the place, sub-district is version A, inconsistent with the version characteristic of current sessions configuration information, in order to allow terminal can obtain higher-quality service, base station controller can be in the switching of common signal channel initiation session configuration information, requires terminal to switch to have the session configuration information of version A characteristic to rise again again and exhales;
S416 if judge that at step S408 the version characteristic of the current session configuration information of enabling is version A, will inquire about the protocol version type of the base station transceiver of exhaling the place, sub-district equally;
S418, if working the protocol version type of the base station transceiver of exhaling the place, sub-district is version 0, can normally set up in order to guarantee to connect, base station controller can be in the switching of common signal channel initiation session configuration information, require terminal to switch to rise again again behind the session configuration information with version 0 characteristic to exhale, set up in the process employed wireless parameter in connection like this and could be discerned by the base station;
S420 is version A if work the protocol version type of the base station transceiver of exhaling the place, sub-district, needs to reject the sub-district that belongs to protocol version 0 base station, because the signaling or the data transmission format of some version A characteristic can't be supported in these sub-districts;
S422 is after the rejecting operation of having carried out step S420, for remaining the pilot frequency distribution resource and continuing connection building process.
There is a kind of scene to mention especially at step S420, the pilot frequency intensity that is exactly all sub-districts that belong to protocol version A base station all adds thresholding above switching, and all belong to pilot frequency intensity the strongest in the sub-district of protocol version 0 base station and belong to pilot frequency intensity the strongest in the sub-district of protocol version A base station with all and compare, intensity will surpass a comparison threshold, then for fear of the then very fast call drop that connects on the sub-district that belongs to protocol version A base station reluctantly, base station controller can adopt the method control terminal identical with step S418 to switch to rise again behind the session configuration information with version 0 characteristic again exhales.The adjusting range of the pilot frequency intensity comparison threshold that the special screne of step S420 is mentioned is 3-5dB.
Fig. 5 is the control flow chart of portable terminal in handoff procedure.As shown in Figure 5, the control flow of portable terminal in handoff procedure comprises following steps:
S502 connects in the maintenance process, and terminal sends routing update message in Traffic Channel, and the new pilot tone of adding is switched in request;
S504, base station controller is judged the terminal protocol release type according to the session configuration information of the terminal of this locality storage, no matter consult one or more sets session configuration informations, if wherein physical layer protocol subtype is default value, judge that then this terminal is the terminal of supported protocol version 0, physical layer subtype is subtype 2 in the cover session configuration information if having at least, judges that then this terminal is the terminal of supported protocol version A;
S506, if the protocol version type of terminal is a version 0, it is constant then to keep current session configuration information, meets the pilot frequency distribution resource that adds the active set condition and continues follow-up switching flow for all of terminal to report simultaneously;
Next S508 if the protocol version type of terminal is version A, needs to judge whether the version characteristic of the current session configuration information of enabling is consistent with it;
S510 if the version characteristic of the current session configuration information of enabling is a version 0, need judge whether the more new technological process of needs initiation session configuration information according to the intensity contrast of the pilot tone that belongs to the diversity of protocol versions base station in the routing update message.If all pilot frequency intensities that belong to the sub-district of protocol version 0 base station all surpass to switch and add thresholding in the routing update message, and all belong to pilot frequency intensity the strongest in the sub-district of protocol version A base station and belong to pilot frequency intensity the strongest in the sub-district of protocol version 0 base station with all and compare, intensity will surpass a comparison threshold, in active set, all be that the existence of this wasting of resources situation of service of version 0 characteristic but can only be carried out in the sub-district that belongs to protocol version A base station then, think and satisfy session configuration information update condition;
S512, if session configuration information update condition does not satisfy, base station controller is kept the current sessions configuration information, for all of terminal to report meet the pilot frequency distribution resource that adds the active set condition and continue follow-up switching flow;
S514, if session configuration information update condition satisfies, base station controller can be in Traffic Channel initiation session configuration information update flow process, control terminal switches to rise again behind the session configuration information with version A characteristic again and exhales, although can cause call drop one time, but terminal can be obtained higher-quality service thereafter, and the advantages outweigh the disadvantages;
S516, if the version characteristic of the current session configuration information of enabling is version A, also need according to the intensity of the pilot tone that belongs to the diversity of protocol versions base station in the routing update message to recently judging whether the more new technological process of needs initiation session configuration information.If all pilot frequency intensities that belong to the sub-district of protocol version A base station all surpass to switch and add thresholding in the routing update message, and all belong to pilot frequency intensity the strongest in the sub-district of protocol version 0 base station and belong to pilot frequency intensity the strongest in the sub-district of protocol version A base station with all and compare, intensity will surpass a comparison threshold, then but cause original service quality not guarantee because radio condition is too poor for fear of on the sub-district that belongs to protocol version A base station, keeping connection reluctantly, also, think and satisfy session configuration information update condition for fear of the meaningless wasting of resources;
S518, if session configuration information update condition does not satisfy, base station controller is kept the current sessions configuration information, and rejects the sub-district that belongs to protocol version 0 base station from routing update message, because the signaling or the data transmission format of some version A characteristic can't be supported in these sub-districts;
S520, after rejecting EO, base station controller meets the pilot frequency distribution resource that adds the active set condition and adds current active set for residue;
S522, if session configuration information update condition satisfies, base station controller can be in Traffic Channel initiation session configuration information update flow process, control terminal switches to rise again behind the session configuration information with version 0 characteristic again and exhales, although can cause call drop one time, take the time that excess resource can not use the high-grade service of expectation but can shorten, the advantages outweigh the disadvantages equally.
The adjusting range of the pilot frequency intensity comparison threshold that step S510 and step S516 use is 3-5dB.
In sum, upgrade the new demand that base station system is proposed at above-mentioned protocol version, the invention provides a kind of method that can support portable terminal in move between base stations with diversity of protocol versions, use this kind method, base station system adaptively control terminal in moving process, enable or switch to a whole set of adaptive wireless parameter according to the current protocol version type of the base station of communication with it, thereby can improve the terminal call success rate, reduce cutting off rate, and provide high-quality service for terminal as far as possible.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. a method of supporting portable terminal in the move between base stations with diversity of protocol versions is characterized in that, said method comprising the steps of:
S102, base station controller is consulted one or more sets session configuration informations according to the protocol version type and the described portable terminal of portable terminal;
S104, rise at described portable terminal and to exhale in the process, described base station controller is exhaled the protocol version type of base station under the sub-district according to rising of the protocol version type of described portable terminal, the current session configuration information of enabling of described portable terminal and described portable terminal, determines whether to connect with described portable terminal or not controlling described portable terminal switches to another set of more adaptive session configuration information; And
S106, in described mobile terminal switching process, the pilot frequency intensity relation that belongs to the diversity of protocol versions base station in the routing update message of described base station controller according to the protocol version type of described portable terminal, the current session configuration information of enabling of described portable terminal, described mobile terminal reporting determines whether to select a part of pilot tone to carry out switching or at first not controlling described portable terminal switches to another set of more adaptive session configuration information.
2. method according to claim 1 is characterized in that, described step S102 comprises:
S1022, described base station controller discern the protocol version type of described portable terminal according to the session negotiation request of described portable terminal; And
S1024, described base station controller is consulted the session configuration information that one or more sets have the different radio characteristic according to the protocol version type and the terminal of described portable terminal.
3. method according to claim 1 and 2, it is characterized in that, described session configuration information comprises following at least a information: protocol subtypes and protocol negotiation parameter that a cover all adopts IS-856 version 0 to support, protocol subtypes and protocol negotiation parameter that a cover all adopts IS-856 version A to support.
4. according to the method described in the claim 3, it is characterized in that described step S104 comprises:
S1042, rise under the situation of exhaling at described portable terminal, described base station controller is exhaled the protocol version type of base station under the sub-district according to rising of current session configuration information of enabling of described portable terminal and described portable terminal, determines whether directly to connect or does not utilize the public information control terminal to switch to the more adaptive session configuration information of an other cover; And
S1044, determining under the situation about directly connecting, what enable is the session configuration information with IS-856 version A characteristic if described portable terminal is current, the protocol version and the unmatched pilot tone of described IS-856 version A of base station, portable terminal place described in the routing update message of described mobile terminal reporting are rejected, connected then.
5. method according to claim 4 is characterized in that, described step S106 comprises:
S1062, under the situation that described portable terminal need switch, the pilot frequency intensity relation that belongs to the diversity of protocol versions base station in the routing update message of described base station controller according to the protocol version type of described portable terminal, the current session configuration information of enabling of described portable terminal and described mobile terminal reporting, determine whether need be on dedicated channel the switching of initiation session configuration information;
S1064 switches at needs under the situation of described session configuration information, and described portable terminal is closed connection after switching to another set of session configuration information;
S1066, do not needing to switch under the situation of described session configuration information, if the current session configuration information of enabling of described portable terminal with IS-856 version A characteristic, then the protocol version and the unmatched pilot tone of described IS-856 version A characteristic of base station, portable terminal place described in the routing update message of described mobile terminal reporting are rejected, switched then.
6. method according to claim 4 is characterized in that described method is applied to cdma communication system.
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| CN101505511B (en) * | 2009-03-10 | 2011-03-30 | 华为技术有限公司 | Method and network element for allocating service channel resource |
| KR101508986B1 (en) | 2009-12-15 | 2015-04-08 | 와이어리스 퓨처 테크놀로지스 인코포레이티드 | Methods, apparatuses, related computer program product and data structure for deciding on a signaling scheme for handover |
| CN104780576B (en) * | 2009-12-15 | 2018-10-23 | 无线未来科技公司 | The method and user equipment of target BS are switched to from source base station |
| CN102388653B (en) * | 2011-09-01 | 2014-10-08 | 华为技术有限公司 | Method and device for selecting frequency point |
| CN103188820B (en) * | 2011-12-28 | 2015-10-21 | 联发科技股份有限公司 | Automatically method and the device of the network version of mobile communication system is reset |
| CN102869060A (en) * | 2012-09-26 | 2013-01-09 | 华为技术有限公司 | Method and device for switching attribute |
| CN106658558A (en) * | 2016-10-31 | 2017-05-10 | 努比亚技术有限公司 | Network self-adaptation method and apparatus, and mobile terminal |
| CN113038545B (en) * | 2019-12-24 | 2022-07-05 | 中国电信股份有限公司 | Method and communication system for reducing handover failure |
| US11553351B2 (en) * | 2020-12-09 | 2023-01-10 | U-Blox Ag | Secure indoor positioning device, system and method |
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| US6026300A (en) * | 1997-07-31 | 2000-02-15 | Ericsson Inc | Method for service acquisition after a call release in a dual mode mobile telephone |
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