CN102131261A - Single card terminal and network reselection method - Google Patents

Single card terminal and network reselection method Download PDF

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Publication number
CN102131261A
CN102131261A CN2010105808685A CN201010580868A CN102131261A CN 102131261 A CN102131261 A CN 102131261A CN 2010105808685 A CN2010105808685 A CN 2010105808685A CN 201010580868 A CN201010580868 A CN 201010580868A CN 102131261 A CN102131261 A CN 102131261A
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China
Prior art keywords
network
domain
threshold
processing module
service
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Inventor
郑小春
曾雪红
林家骐
杨景军
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Priority to CN2010105808685A priority Critical patent/CN102131261A/en
Publication of CN102131261A publication Critical patent/CN102131261A/en
Priority to PCT/CN2011/082067 priority patent/WO2012075874A1/en
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/14Reselecting a network or an air interface
    • H04W36/144Reselecting a network or an air interface over a different radio air interface technology
    • H04W36/1443Reselecting a network or an air interface over a different radio air interface technology between licensed networks
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/24Reselection being triggered by specific parameters
    • H04W36/249Reselection being triggered by specific parameters according to timing information

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The embodiment of the invention discloses a single card terminal and a network reselection method. The terminal comprises a 2G processing module and a 3G processing module, wherein the 2G processing module is used for residing a circuit switched (CS) domain in a 2G network preferentially and executing CS domain services; the 3G processing module is used for residing a packet switched (PS) domain in a 3G network preferentially and executing PS domain services; the 3G processing module is also used for detecting 3G network signal intensity; and when the 3G processing module detects that the 3G network signal intensity is not higher than a first threshold and lasts for a first time, the 2G processing module is also used for judging whether the 2G network accords with the PS domain residence condition, if so, the PS domain is resided in the 2G network, and the PS domain services are executed in the 2G network. According to the embodiment of the invention, the PS domain and the CS domain can be resided in different modules respectively, and CS domain services and the PS domain services are given consideration; meanwhile, the network reselection process is accelerated, and the user experience is improved.

Description

Single-card terminal and network reselection method
Technical Field
The invention relates to the technical field of communication, in particular to a single-card terminal and a network reselection method.
Background
In the field of wireless communication technology, 2G networks and 3G networks are two networks widely used. Services based on 2G networks and 3G networks mainly include voice services and data services, wherein the voice services are carried by a Circuit Switched Domain (CS Domain), the data services are carried by a Packet Switched Domain (PS Domain), and the CS Domain services and the PS Domain services are supported by both the 2G networks and the 3G networks. The CS domain or the PS domain may be understood as a set of software and hardware that handles CS domain services (e.g., voice services) or PS domain services (e.g., data services).
Because the 3G network is an emerging network relative to the 2G network, the bandwidth is larger than that of the 2G network, and the data service experience is better than that of the 2G network, but the network coverage of the 3G network is generally not mature than that of the 2G network, and the situation that no 3G signal exists often occurs in actual use, which affects the user experience. In order to improve the user experience, the terminal of the existing 3G network (such as a 3G handset) generally supports the 2G network at the same time, so as to reselect to the 2G network when the 3G signal is poor. Such a terminal supporting both 2G and 3G networks is referred to herein as a "dual-mode terminal" (e.g., a WCDMA/GSM dual-mode, TD-SCDMA/GSM dual-mode handset), wherein a terminal using one SIM card is also referred to as a "single-card dual-mode terminal".
Referring to fig. 1, a schematic structural diagram of a single-card dual-mode terminal in the prior art is shown, and for convenience of description, only a few main functional modules are listed here, including:
SIM card, SIM card agent module, application, service adaptation module, 2G/3G protocol stack processing module, 2G/3G physical layer processing module, 2G/3G radio frequency processing module and antenna, wherein:
the SIM card is used for storing some information of the user, including the information of the user in the 2G network and the 3G network, and the SIM card can be a SIM card frequently used by the 2G network or a higher-level USIM card;
the SIM card agent module is used for acting when the 2G/3G protocol stack processing module accesses the SIM card, so that the SIM card can access the corresponding 2G or 3G user information in the SIM card under the condition of 2G and 3G networks;
the application program refers to some programs related to service or control in the terminal;
the service adaptation module is used for connecting an application program and the 2G/3G protocol stack processing module and is mainly used for selecting a proper protocol stack to transmit services according to the resident state of the 2G/3G protocol stack.
The 2G/3G protocol stack processing module is used for processing 2G and 3G related protocols, where the protocol generally refers to a protocol above a physical layer, such as MAC/RLC/RRC.
The 2G/3G physical layer processing module is used for processing protocols related to 2G and 3G physical layers;
the 2G/3G radio frequency processing module is used for completing the processing functions related to the 2G and 3G radio frequency modules;
the antenna performs reception and transmission of 2G and 3G signals.
Based on the single-card dual-mode terminal preferentially residing in the 3G network, the CS domain and PS domain services are processed under the 3G network through the 2G/3G protocol stack processing module, the 2G/3G physical layer processing module, the 2G/3G radio frequency processing module and other modules, and the terminal judges whether the signal quality of the terminal is smaller than a set threshold value (such as S) at regular intervals (such as several seconds)searchRAT) If so, starting to search the different system network (different from the system in which the network is located, for example, if the network is located in the 3G network, the 2G network is the different system network, and specifically may include a plurality of cell networks), and obtaining a plurality of different system network signals; and then sorting the signals, selecting a different system network with the strongest signal intensity, comparing the different system network with the network signal of the different system network, and reselecting when the different system network is stronger than the network signal of the different system network by a certain threshold. The above steps are all flows defined in the standard, and are not described herein again. Similarly, if the terminal is located in the 2G network and in an idle state, the step of reselecting to the 3G network is similar to the method described above, that is, it is determined at regular intervals whether the signal quality of the terminal meets the start-up search threshold, the system is searched after the conditions are met, the strongest different system network is found and compared with the signal of the terminal, or whether the different system is reselected is determined according to whether the cell strength of the different system is greater than a certain threshold.
In the process of implementing the invention, the inventor finds that the prior art has at least the following disadvantages:
when the existing single-card dual-mode terminal reselects from one network to another network, there is a period of service unreachable, that is, service interruption can be caused in the period of time, and neither CS domain service nor PS domain service can be performed. Meanwhile, as the different system network signals need to be searched and judged and sequenced in the process of reselecting to the different system network, the process cannot be completed in a short time, so that the time of unreachable services is increased, and the user experience is influenced.
Disclosure of Invention
The embodiment of the invention provides a single-card terminal and a network reselection method, which are used for improving user experience.
The embodiment of the invention provides a single-card terminal, which comprises:
the 2G processing module is used for preferentially residing the CS domain in the 2G network and executing the CS domain service;
the 3G processing module is used for preferentially residing the PS domain in the 3G network and executing the PS domain service;
the 3G processing module is also used for detecting the signal intensity of the 3G network; when the 3G processing module detects that the signal strength of the 3G network is not higher than the first threshold and lasts for the first time, the 2G processing module is further configured to determine whether the 2G network meets the PS domain residing condition, and if so, reside the PS domain in the 2G network, and execute the PS domain service in the 2G network.
The embodiment of the invention also provides a network reselection method, which comprises the following steps:
preferentially residing the CS domain in the 2G network and executing the CS domain service;
preferentially residing the PS domain in the 3G network and executing the PS domain service;
detecting the signal intensity of the 3G network, judging whether the 2G network meets the PS domain residing condition or not when detecting that the signal intensity of the 3G network is not higher than a first threshold and lasts for a first time, residing the PS domain to the 2G network if the signal intensity of the 2G network meets the PS domain residing condition, and executing PS domain service in the 2G network.
The technical scheme has the following advantages that:
because the CS domain and the PS domain are preferentially resided in the 2G network and the 3G network respectively in the embodiment of the invention, the signal coverage of the 2G network is generally superior to that of the 3G network, and the data transmission speed of the 3G network is superior to that of the 2G network, therefore, the communication requirement on the voice service (CS domain service) can be met, and the high-speed data service can be enjoyed; meanwhile, in the embodiment of the invention, when the network is reselected, the network does not need to be searched as in the prior art, but is directly reselected after the condition is met, so that the reselection speed is increased, and the user experience is further improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed for the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a single-card dual-mode terminal in the prior art;
fig. 2 is a schematic structural diagram of a terminal according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a terminal according to another embodiment of the present invention;
fig. 4 is a flowchart illustrating reselection in a service state according to a third embodiment of the present invention;
fig. 5 is a flowchart of a four-network reselection method according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to specific embodiments and accompanying drawings.
Example one
The first embodiment of the present invention provides a terminal, which is also referred to as a "single-card dual-standby terminal", that is, the terminal is based on an SIM card and supports a resident 2G network and a 3G network at the same time, where the 2G network may be a GSM network, and the 3G network may be a TD-SCDMA, WCDMA, or other networks.
Referring to fig. 2, a schematic structural diagram of an embodiment of the present invention is different from the single-card dual-mode terminal in the prior art shown in fig. 1 in that the embodiment of the present invention includes two independent processing modules, namely a 2G processing module 21 and a 3G processing module 22, for processing a 2G service and a 3G service, respectively. Specifically, refer to fig. 3, which is a schematic diagram of a specific structure of a 2G processing module and a 3G processing module, where the 2G processing module includes a 2G protocol stack processing module 211, a 2G physical layer processing module 212, a 2G radio frequency processing module 213, and a 2G antenna 214; the 3G processing module includes a 3G protocol stack processing module 221, a 3G physical layer processing module 222, a 3G radio frequency processing module 223 and a 3G antenna 224.
The 2G protocol stack processing module is used for finishing the processing of related protocols of a 2G network, and the protocols are generally protocols above a physical layer; the 2G physical layer processing module is used for finishing the processing of data on the physical layer; the 2G radio frequency processing module is used for processing the 2G radio frequency signal; the 2G antenna is used for completing signal transmission and reception of the 2G network.
Similar to the sub-modules in each 2G processing module, in the 3G processing module, the 3G protocol stack processing module is used for completing the relevant protocol processing of the 3G network; the 3G physical layer processing module is used for finishing the processing of data on a physical layer; the 3G radio frequency processing module is used for processing the 3G radio frequency signal; the 3G antenna is used for completing signal transmission and reception of the 3G network.
In addition, similar to the terminal in the prior art, the terminal in the embodiment of the present invention also includes a SIM card 23, a SIM card proxy module 24, an application 25, and a service adaptation module 26. The functions of the various modules have been introduced in the background and are not described in detail herein. It should be noted that, in the embodiment of the present invention, the SIM agent module and the service adaptation module are both connected to the 2G protocol stack processing module and the 3G protocol stack processing module, respectively, although a specific connection relationship changes compared to the prior art, the basic functions of the SIM agent module and the service adaptation module do not change, that is, the SIM agent module is used for acting when accessing the SIM card to different network processing modules; the service adaptation module is used for selecting a proper protocol stack to transmit the service according to the resident states of the 2G protocol stack processing module and the 3G protocol stack processing module. In addition, in the embodiment of the present invention, the service adaptation module is also configured to perform coordination processing on the 2G protocol stack processing module and the 3G protocol stack processing module, for example, the states of the two modules may be unified, and the state of one of the modules is notified to the other module.
It should be noted that some functions in the above modules may also be implemented separately or integrated into other modules, for example, the overall function of the business module may be implemented separately, or integrated into a 2G protocol stack processing module, or a 3G protocol stack processing module. For example, when the hardware is specifically implemented, if the module of the 2G function (including the processing module such as the protocol stack and the physical layer) is implemented by one chip, and the module of the 3G function (including the processing module such as the protocol stack and the physical layer) is implemented by another chip, the code for coordinating the states of the two may be written on the chip implementing the 2G function module, or may be written on the chip implementing the 3G function module.
For convenience of explanation, in the embodiment of the present invention, the 2G processing module or the 3G processing module is used to describe the corresponding steps in a unified manner, and the respective sub-modules in the 2G processing module or the 3G processing module are not used to describe the corresponding steps in detail. For example, when the terminal receives a certain parameter related to a 3G service issued by a 3G network and performs corresponding processing, the description in the embodiment of the present invention is as follows: the 3G processing module receives a certain parameter issued by the 3G network and carries out corresponding processing; as one skilled in the art can know by combining the embodiment of the present invention and the prior art, the detailed flow of the steps is as follows: firstly, receiving parameters (radio frequency signals) issued by a 3G network through a 3G antenna, then transferring the received radio frequency signals to a 3G radio frequency processing module, processing the radio frequency signals, then sending the processed signals to a 3G physical layer processing module, carrying out physical layer processing by the 3G physical layer processing module, sending the processed signals to a 3G protocol stack processing module after the 3G physical layer processing module finishes processing, and carrying out corresponding processing on the parameters.
The following specifically describes an embodiment of the present invention based on fig. 3, in which:
the 2G processing module is used for preferentially residing the CS domain in the 2G network and executing the CS domain service;
the 3G processing module is used for preferentially residing the PS domain in the 3G network and executing the PS domain service;
the 3G processing module is also used for detecting the signal intensity of the 3G network; when the 3G processing module detects that the signal strength of the 3G network is not higher than the first threshold and lasts for the first time, the 2G processing module is further configured to determine whether the 2G network meets the PS domain residing condition, and if so, reside the PS domain in the 2G network, and execute the PS domain service in the 2G network.
In the embodiment of the invention, the 2G/3G processing module in the prior art is divided into two independent 2G processing modules and 3G processing modules, the CS domain and the PS domain services are respectively and preferentially processed by the 2G processing modules and the 3G processing modules, as the CS domain mainly comprises voice services (such as dialing calls), the CS domain is unreachable and more sensitive to the services, and if a user cannot talk within a period of time, the user experience is greatly influenced. The embodiment of the invention preferentially resides the CS domain in the 2G network, and the quality of the CS domain service can be ensured because the 2G network is generally more stable than the 3G network. Meanwhile, the embodiment of the invention preferentially reserves the PS domain service (such as data service) in the 3G, and can preferentially and fully utilize the high-speed data transmission characteristic of the 3G network to better complete the data service; meanwhile, the embodiment of the present invention provides a new network reselection mode based on the new terminal design architecture, and the condition that the PS domain is reselected from the 3G network to the 2G network is that "the 3G network signal is lower than the set threshold and lasts for a period of time, and the 2G network signal satisfies the PS domain service residence condition corresponding to the 3G network", where "last period of time" is favorable for making more accurate determination and preventing unnecessary reselection (if the network signal is good in most of the time, but only drops within a short period of time, reselection is unnecessary at this time). Meanwhile, compared with the prior art, the embodiment of the invention directly reselects when the rule is met, and does not need to search for an available network any more, and the searching process consumes a certain time, so that the searching processes (including the steps of subsequent sequencing, selecting a maximum value, comparing and the like) are omitted, the time for network reselection can be reduced, the service unreachable time is also shortened, and the user experience is improved.
Example two
The embodiment of the present invention is further described based on the first embodiment.
In the embodiment of the present invention, the "CS domain resides in the 2G network" may be understood as: the terminal initiates a LAU (Location Area Update) process to attach to the 2G network; meanwhile, the "PS domain residing to the 3G network" may be understood as: the terminal initiates a GPRS attach or RAU (Route Area Update) to attach to the 3G network. Those skilled in the art may implement the CS domain residing in the 2G network or the PS domain residing in the 3G network according to the embodiment of the present invention and the prior art, which will not be described herein.
The flow of detecting a 3G network signal by a 3G processing module in the embodiment of the present invention may refer to the flow of detecting a 3G network signal when an existing 2G/3G processing module (including processing modules such as a protocol stack, a physical layer, and a radio frequency) operates in a 3G state, and generally, detection is performed at an uninterrupted timing after a power-on, where "uninterrupted timing detection" refers to detection at intervals and is performed continuously, and a common method is to perform periodic detection, that is, detection is performed at intervals of the same time (such as 3 seconds); of course, the present invention is not limited to using other self-defined rules (e.g. periodic detection during one period, non-periodic detection during another period) to perform "uninterrupted timing detection".
In the embodiment of the invention, after the PS domain is reselected from the 3G network to the 2G network, the PS domain can return to the 3G network again when the 3G network signal is recovered. Specifically, when the signal strength of the 3G network detected by the 3G processing module is not lower than another threshold and lasts for another time, the PS domain is resided in the 3G network, and the PS domain service is executed in the 3G network.
Similarly, for the CS domain, reselection may also be performed between the 2G network and the 3G network, specifically:
the 2G processing module is also used for detecting the 2G network signal intensity, and the detection method can refer to the flow of detecting the 2G network signal intensity when the existing 2G/3G processing module operates in the 2G state; the 2G processing module and the 3G processing module in the embodiment of the invention are two independent modules, and execute two search processes in parallel, wherein the search process of one processing module does not depend on the other processing module.
When the 2G processing module detects that the signal intensity of the 2G network is not higher than the set threshold and lasts for a period of time, the 3G processing module is further configured to determine whether the 3G network meets the CS domain residing condition, and if so, reside the CS domain in the 3G network, and execute the CS domain service in the 3G network.
When the CS domain resides in the 3G network, the 2G processing module is further configured to:
and when the signal strength of the 2G network is detected to be not lower than the set other threshold and lasts for another time, the CS domain is resided to the 2G network, and CS domain services are executed in the 2G network.
The above-mentioned decision rule for reselecting the PS domain from the 3G network to the 2G network may be applicable to an idle state (that is, no traffic channel exists at the air interface) and a traffic state (that is, a traffic channel exists at the air interface), but considering that when the PS domain is in a traffic state, if reselection is too frequent, the traffic may be affected, and therefore, the threshold may be set smaller than the threshold in the idle state.
In addition, when the PS domain is in the 3G network and is in a service state, the 3G processing module is further configured to perform cell update when a radio link is out of synchronization, and if the update is unsuccessful, the PS domain is camped on the GSM network. Because there is Radio Link (RL) out-of-step (caused by Link interference, for example) although the signal is strong, when the Radio Link is out-of-step, cell update is required, and if the Radio Link is unsuccessful, the GSM network also needs to be reselected.
In the embodiment of the invention, when the PS domain is reselected from the 3G network to the 2G network, whether the 2G network meets the PS domain residence condition needs to be judged; meanwhile, when the CS domain reselects from the 2G network to the 3G network, it is also necessary to determine whether the 3G network satisfies the CS domain residence condition. The specific determination method can adopt the following methods:
first, passing signal strength and threshold
And judging whether the signal intensity of the network is greater than a threshold, if so, indicating that the residence condition is met, and if not, indicating that the residence condition is not met. The scheme may refer to some determination methods in the prior art, for example, the determination may be performed through an S criterion, and of course, the embodiment of the present invention does not limit the use of other thresholds for the determination.
Secondly, by judging whether the reselection target network has services
Specifically, if the PS domain needs to be reselected from the 3G network to the 2G network, it is determined whether a CS domain service resides in the 2G network, if so, the reselection is performed, otherwise, the reselection is not performed; meanwhile, when the CS domain needs to be reselected from the 2G network to the 3G network, whether the PS domain service is resided in the 3G network is judged, if so, the PS domain service is reselected, otherwise, the CS domain service is not reselected.
And judging whether the other network has corresponding services which can be completed by the service adaptation module, then forwarding the obtained result to the 2G processing module to reside the PS domain to the 2G or to the 3G processing module, and residing the CS domain to the 3G.
In the embodiment of the present invention, the thresholds and the durations may adopt different values for different scenarios, and a threshold for reselecting the PS domain from the 3G network to the 2G network, or a threshold for reselecting the CS domain from the 2G network to the 3G network should be a suitable value, so as to avoid frequent reselection when the size is too large, reduce the PS domain service availability when the size is too small, and simultaneously enable the terminal to stay in the 3G network as much as possible. The specific selection of the "suitable value" may be determined according to experiments, local network status, and operation policy of the operator, or other factors, and is not limited herein.
Meanwhile, in the existing network, the 2G network load is generally heavier, the 3G network load is lighter, the capacity expansion of the 2G network is difficult, and the 3G network is wasted due to light load. Aiming at the characteristics of the network, the threshold for reselecting the PS service from the 3G network to the 2G network can be set to a more reasonable value (lower than that of the existing dual-mode terminal), so that the PS domain service is left in the 3G network as much as possible, the function of shunting 2G network service data by the 3G network is fully exerted, and the loads of the two networks are more balanced.
In the embodiment of the invention, the threshold when the 2G network is reselected to the 3G network is smaller than the threshold when the 3G network is reselected to the 2G network, so as to avoid ping-pong reselection.
In addition, various parameters (including the threshold and the duration) in the embodiment of the invention can be obtained through local configuration or network transmission, and the information obtained through the network transmission mode can be more flexible, because the network side can more accurately configure the threshold and the duration value according to the coverage characteristics of a specific network and the operation strategies in different periods.
EXAMPLE III
The embodiment of the present invention is described based on the first and second embodiments, taking the 2G network as the GSM network and the 3G network as the TD-SCDMA network (hereinafter referred to as TD network) as an example.
For convenience of explanation, in the embodiment of the present invention, the 2G processing module is referred to as a "GSM processing module" instead; the 3G processing module is referred to as "TD processing module", it can be understood that the GSM processing module and the TD processing module are respectively a specific implementation of the 2G processing module and the 3G processing module, the GSM processing module having the function of the 2G processing module in the first embodiment and the second embodiment also has the function of the TD processing module having the function of the 3G processing module in the first embodiment and the second embodiment also has the function of the TD processing module.
The following description will take as an example the whole process from power-on to reselection of a terminal.
1. Terminal startup
When the terminal is started, the GSM processing module starts to search a proper GSM network, specifically, a GSM cell with the strongest GSM signal is obtained through searching, a CS attachment process is subsequently executed, and a CS domain is resided in the GSM network; the TD processing module also searches for a suitable TD network (TD cell) in parallel, and executes a PS domain attachment process to reside the PS domain in the TD network.
In the above-mentioned camping process, it can be understood that there is a process of determining whether camping is possible, wherein when determining whether GSM and TD networks are suitable for camping service, S criteria conforming to standard protocols may be adopted, that is:
srxlev > 0 (rule 1)
Wherein Srxlev ═ Qrxlevmeas-Qrxlevmin-Pcompensation;
When the condition of the formula 1 is met, selecting the searched network for residing; otherwise, no residence is performed.
Alternatively, when determining whether the GSM and TD networks are suitable for camping, the determination may be made according to the following determination rule used in the reselection of the part 3 network.
After the residence is completed, the subsequent 2G processing module and the 3G processing module will constantly detect the signals of their respective networks at regular time, and the specific time intervals and the detection strategies may be the same or different.
2. Post-boot state
After the terminal is started, when the terminal is in an idle state, the network in which the terminal is located has several situations:
scene 1: the TD network has signals, and the GSM network has signals;
scene 2: the TD network has signals, and the GSM network has no signals;
scene 3: no signal exists in the TD network, and a signal exists in the GSM network;
scene 4: no signal exists in a TD network and no signal exists in a GSM network;
the above-mentioned signal is understood as that the signal is in accordance with the service residence condition, and the signal is not in accordance with the service residence condition.
Reselection occurs between these several scenarios as the network environment of the terminal changes, and the decision rule of reselection will be specifically described by the section 3 "network reselection".
3. Network reselection
In the embodiment of the present invention, the TD processing module and the GSM processing module are two independent modules, and the two modules respectively and independently perform search detection on network signals, so the description is respectively performed on the signal change of the TD network and the signal change of the GSM network:
3.1TD network Signal Change
When the PS domain resides in the TD network, the TD processing module obtains a TD network signal through detection, and judges whether the TD network is suitable for service by combining the following rules:
t(Srxlev<=STDidletogsm-SUDS)>Treselections(rule 2)
Wherein Srxlev represents TD network signal strength, and is specifically Srxlev ═ Qrxlevmeas-Qrxlevmin-Pcompenation, thisLi STDidletogsm-SUDSThe threshold value is obtained by local configuration, and can also be issued from the network, Srxlev and TreselectionsSpecific meanings can be found in the standard definition, STDidletogsm-SUDSRepresents a threshold level; treselectionsIndicates the duration of time; t () represents the duration when the expression in parentheses is satisfied. The whole rule indicates that the TD network signal Srxlev is less than or equal to the threshold level STDidletogsm-SUDSAnd a duration greater than Treselections
If the rule 2 is satisfied, the TD network does not satisfy the condition of residing in the TD network; and when the TD processing module knows that the TD network is not suitable for carrying out service and the GSM network is suitable for residing (for example, the judgment is carried out by the S criterion, or the service adaptation module knows that the CS domain resides in the GSM network), the PS domain resides in the GSM network.
In practical application, in order to make the PS domain reside in the TD network as much as possible (the existing network generally has a large GSM load and a small TD network load, and the existing network residing in the TD network can share the load with the GSM network, and at the same time, the TD network can more fully enjoy high-speed data services), STDidletogsm-SUDSThe value should be a little smaller, if the configuration is too large, reselection is frequent, which affects the utilization rate of the TD network, but not too small, otherwise, the PS domain service connectivity rate is reduced (the signal strength is too low and the reselection is not performed, which results in service difficulty).
Specifically, STDidletogsm-SUDSThe value may be based on the existing threshold value SsearchRAT, and an offset value S is subtracted from SsearchRATTDoffsetXidletogsm(e.g., default values may be 3dB based on empirical values); because the existing threshold value SsearchRAT is a value issued based on the network, it can be used for reselection determination more accurately. In another implementation, STDidletogsm-SUDSThe value can also be based on only one fixed threshold, which is applicable to all networks, for example, the default value can be 5 dB.
Furthermore, as a rule of thumb, Qrxlevmin is typically configured at-103 dBm and Treselection is typically configured at 2 seconds.
When the PS domain resides in the GSM network, the TD processing module obtains a TD network signal through searching, and judges whether the TD network is suitable for service by combining the following rules:
t(Srxlev>STDrtn-SUDS)>TTDrtn-SUDS(rule 3)
Wherein Srxlev represents a TD network signal; sTDrtn-SUDSRepresents a threshold value; t isTDrtn-SUDSRepresents a duration of time; t () represents the duration when the expression in parentheses is satisfied. The entire rule represents the TD network signal SrxlevGreater than a threshold level STDrtn-SUDSAnd a duration greater than TTDrtn-SUDS
When the rule 3 is satisfied, the TD network satisfies the residing condition; otherwise, the TD network does not meet the condition of residing. And when the TD processing module knows that the TD network meets the residing condition through the rule 3, the PS domain is resided from the GSM network to the TD network again.
To avoid frequent reselection, STDrtn-SUDSIs a value of STDidletogsm-SUDSMore specifically, STDrtn-SUDSCan be based on STDidletogsm-SUDSAt STDidletogsm-SUDSPlus an offset value STDoffsetXidlertn(default value of 4dB may be taken). But the size of the network is not too large so as to avoid the problem that the TD network is difficult to reselect back to influence the utilization rate of the TD network, and if the size is too small, the reselection frequency and the experience are influenced, and 9dB is recommended to be configured; t isTDrtn-SUDSThe change speed of the specific wireless environment is required to be determined, and the default value is 5 seconds.
3.2GSM network Signal Change
When the CS domain resides in the GSM network, the GSM processing module obtains a GSM network signal through searching, and judges whether the GSM network is suitable for service by combining the following rules:
t (Srxlev < ═ 0) > T3 (rule 4)
Wherein, Srxlev represents a GSM network signal, and is a signal intensity representation mode defined in a standard; 0 represents a decision threshold; t3 denotes duration; t () represents the duration when the expression in parentheses is satisfied; the entire rule indicates that the GSM network signal Srxlev is greater than 0 and has a duration greater than T3.
If rule 4 is satisfied, it indicates that the GSM network is not suitable for camping; otherwise, it indicates that the GSM network is suitable for camping. And when the GSM processing module knows that the GSM network is not suitable for residing and the TD network is suitable for residing (through S criteria or judging whether the TD network resides with PS domain services), the CS domain resides in the TD network.
To prevent ping-pong (back and forth reselection), T3 may be set longer, for example, by default to 180 seconds, although other values may be configured in actual use.
The difference between this criterion and the dual-mode terminal in the prior art is that the TD network is reselected only when GSM is unavailable for a long time, and the TD network is reselected regardless of the good signals of the TD network.
When the CS domain resides in the TD network, the GSM processing module obtains a GSM network signal through detection, and judges whether the GSM network is suitable for service by combining the following rules:
t (Srxlev > 0) > T3' (rule 5)
Wherein Srxlev represents a GSM network signal; 0 represents a decision threshold; t3 denotes duration; t () represents the duration when the expression in parentheses is satisfied; the entire rule represents the GSM network signal SrxlevGreater than 0 and for a time duration greater than T3'.
If rule 5 is satisfied, it indicates that the GSM network is eligible for camping; otherwise, it indicates that the GSM network is not suitable for camping. When the GSM processing module knows that the GSM network is suitable for residing, the CS domain resides in the GSM network.
To prevent ping-pong, T3' may be defaulted here to 60 seconds.
The difference between this criterion and the dual-mode terminal in the prior art is that the GSM network is reselected as long as the GSM network signal is recovered for a period of time, and the TD network signal is not considered to be good or bad.
The above paragraphs mainly describe the method for determining whether to reselect the network in the idle state, and the following description will describe the determination method with respect to the traffic state.
For a terminal in a service state, the above general principle of determining in an idle state is also applicable, that is, it is determined whether the signal strength is not lower than (not higher than) a threshold value and lasts for a period of time, but in the service state, reselection may have a certain influence on the service in consideration of the service, and therefore, compared with the idle state, the reselection condition should be stricter, that is, reselection is not required as much as possible.
Specifically, the decision condition for reselecting the PS domain from the 3G network to the 2G network may be:
t(Srxlev<=(STDidletogsm-SUDS-Soffset))>TTDconntogsm-SUDS(rule 6)
Wherein Srxlev represents signal strength and is a parameter defined in a standard; sTDidletogsm-SUDSFor the decision threshold value in rule 2 (idle state), in the traffic state, the last threshold value needs to be subtracted by SoffsetTherefore, the threshold value of the judgment is smaller than that in the idle state, that is, the judgment of reselection is performed when the Srxlev is smaller, so that the reselection condition is stricter.
At the same time, the offset value S for TD of different carrier frequenciesoffsetIt may also be different, such as for R4 carrier frequency, the value may default to 1 dB; for HSDPA carrier frequencies, this value may be 3dB by default.
For the decision rule that the PS domain returns from the 2G to the 3G network and the CS domain reselects between the 3G network and the 2G network, the idle state rule may be referred to, and details are not repeated herein.
Further, there is also a problem of radio link out-of-sync (RL out-of-sync) when the terminal is in a traffic state, and if there is RL out-of-sync, reselection is required if the traffic is not actually well served even though the signal strength satisfies the camping condition. The RL out-of-step and the subsequent processing flow are defined in the standard and will not be described herein.
Referring to fig. 4, a schematic diagram of a process of reselecting from TD to GSM when the PS domain is in a service state:
the flow chart shows that there are two ways for the PS domain to reselect from TD to GSM network, one is to satisfy the following relation, i.e. the signal strength is not higher than a certain threshold and lasts for a while:
t(Qrxlevmeasq) > T (rule 7)
Wherein Q isrxlevmeasRepresenting signal strength, Q representing a threshold, T, representing duration; it is assumed here that the threshold is obtained from the network, and if the threshold is configured locally, the signal strength can also use Srxlev
Specifically, for the R4 carrier frequency, Q is specifically denoted as QTDR4conntogsm-SUDSAnd T is specifically represented by TTDconntogsm-SUDS(ii) a For HSDPA carrier frequencies, Q is specifically denoted as QTDHSconntogsm-SUDSAnd T is still represented by TTDconntogsm-SUDS. The configuration of the two thresholds is too low, the call drop rate of the PS will increase, and too high will cause frequent reselection and reduce the utilization rate of the TD network. Advice QTDR4conntogsm-SUDSConfiguration-99 dBm, QTDHSconntogsm-SUDSConfiguration-101 dBm, TTDconntogsm-SUDSThe configuration is recommended to be 1280 ms.
The second way is to update the cell when the RL is out of synchronization, and reselect to the GSM network if the RL is not out of synchronization.
In addition, the PS domain service state may also adopt the following method for determining whether to reselect from the 3G network to the 2G network:
when the terminal performs the PS domain service, an identifier is carried when a service request message (RRC SETUP message) is sent to the network, where the identifier is that the terminal is a normal single-card dual-mode terminal in the prior art, and after the network receives the message, the network determines whether to reselect to the GSM network through a current flow (a flow for determining a normal single-card dual-mode in the prior art).
The above-mentioned various parameters (including various thresholds and durations) may be configured locally or obtained through network delivery, for example, System message delivery parameters are broadcasted by the TD network RNC, SIB3 (System message Block 3, System Information Block type 3) is extended, and various parameters are placed in MappingInfo field in cellselecteselecteselecteselectelnfo structure in SIB3 and then sent to the terminal.
Specifically, the MappingInfo field may be extended in the manner of table 1:
TABLE 1 extended MappingInfo field
Figure BDA0000037152700000141
Figure BDA0000037152700000151
Figure BDA0000037152700000161
The meaning of each field in table 1 is well known to those skilled in the art, and those skilled in the art can issue parameters through the network by using the contents in table 1.
The embodiment of the invention introduces a terminal and a specific processing method for carrying out single-card double-standby based on a GSM network and a TD network.
In addition, when a certain network is not suitable for residing through the judgment rule, another network can be reselected without restarting a different system to search for the network, so that the reselection time is shortened, and the user experience is improved; meanwhile, the signal strength of the two systems is not compared in the reselection process, so that the user experience is improved, and the processing of the terminal is simplified.
And aiming at the practical characteristics of the existing network (the GSM network has heavier load, the TD load is lighter, the GSM network is difficult to expand, and the 3G network has light load and is wasted), the reselection threshold can be set lower than that of the existing dual-mode terminal (for example, an offset value is subtracted on the Ssearch RAT basis), so that the PS service can be left in the TD network as much as possible, the effect of shunting the GSM network data service by the TD network is fully exerted, and the loads of the two networks are more balanced.
It should be noted that, although the embodiment of the present invention is described by taking the 2G network as the GSM network and the 3G network as the TD network as an example, the flow of the processing is also applicable to the 3G network as a network of another system (such as WCDMA), and similar technical effects can be obtained. Those skilled in the art can implement adaptive modification to implement selective reselection between other 3G networks and 2G networks by combining with specific parameter definitions in the embodiments of the present invention and other network systems. Meanwhile, the embodiment of the invention can also be applied to the combination of LTE and GSM or LTE and 3G networks, namely, the CS domain is preferentially resided in the GSM network and the PS domain is preferentially resided in the LTE network; or the CS preferentially resides in the 3G network and the PS domain preferentially resides in the LTE network. Alternatively, the embodiments of the present invention may also be applied to other unknown networks supporting CS domain and PS domain services in combination with existing (or unknown) networks.
Example four
An embodiment of the present invention provides a network reselection method, referring to fig. 5, including the following steps:
s41, preferentially residing the CS domain in the 2G network, and executing the CS domain service; preferentially residing the PS domain in the 3G network and executing the PS domain service;
s42, detecting the signal intensity of the 3G network, when detecting that the signal intensity of the 3G network is not higher than a first threshold and lasts for a first time, judging whether the 2G network meets the PS domain residing condition, if so, residing the PS domain in the 2G network, and executing the PS domain service in the 2G network.
In the embodiment of the present invention, when the PS domain resides in the 2G network, the following steps may be further included:
and when the signal strength of the 3G network obtained by detection is not lower than a set second threshold and lasts for a second time, the PS domain is resided in the 3G network, and the PS domain service is executed in the 3G network.
The embodiment of the invention also comprises the following steps:
detecting the signal intensity of the 2G network;
and when the signal intensity of the 2G network is detected to be not higher than a third threshold and lasts for a third time, judging whether the 3G network meets the CS domain residing condition, if so, residing the CS domain in the 3G network, and executing the CS domain service in the 3G network.
In this embodiment of the present invention, when the CS domain resides in the 3G network, the method further includes:
and when the 2G network signal strength is detected to be not lower than the fourth threshold and lasts for the fourth time, the CS domain is resided to the 2G network, and CS domain services are executed in the 2G network.
One or more of the thresholds may be obtained through local configuration or through network delivery.
In the embodiment of the present invention, the determining whether the 2G network satisfies the PS domain residence condition includes:
judging whether the CS domain resides in the 2G network, if so, judging that the 2G network meets the PS domain residence condition, otherwise, judging that the 2G network does not meet the PS domain residence condition; or,
judging whether the signal intensity of the 2G network is greater than a fifth threshold, if so, judging that the 2G network meets the PS domain residence condition, otherwise, judging that the 2G network does not meet the PS domain residence condition;
judging whether the 3G network satisfies the CS domain comprises:
judging whether the PS domain resides in the 3G network, if so, judging that the 3G network meets the residence condition of the CS domain, otherwise, judging that the 3G network does not meet the residence condition of the CS domain; or,
and judging whether the signal intensity of the 3G network is greater than a sixth threshold, if so, judging that the 3G network meets the residence condition of the CS domain, and otherwise, judging that the 3G network does not meet the residence condition of the CS domain.
Meanwhile, the value of the first threshold is configured to be a proper value in the embodiment of the invention, so that the terminal can stay in the 3G network as much as possible, and frequent reselection caused by too large is avoided, and the PS domain service connection rate is reduced caused by too small.
In the embodiment of the invention, when the PS domain is positioned in the 3G network and is in a service state, the cell is updated when the wireless link is out of step, and if the updating is unsuccessful, the PS domain is resided in the GSM network.
Meanwhile, when the PS domain is located in the 3G network and is in a service state, the threshold value used when the PS domain is judged to reside in the 2G network is smaller than the threshold value used when the PS domain is located in the 3G network and is judged to reside in the 2G network when the PS domain is in an idle state.
The method can be implemented based on the modules in the first, second and third embodiments, or implemented by using similar module architectures. The explanation of the related terms and the specific execution flow can also refer to the description in the above embodiments, and are not repeated herein.
By the embodiment of the invention, the CS domain is preferentially resided in the 2G network, and the PS domain is preferentially resided in the 3G network, thereby ensuring the CS domain service quality which is less sensitive to service than the comparable service quality, and preferentially enjoying the high-speed PS domain service of the 3G network. In addition, the embodiment of the invention also provides a method for reselecting and selecting among networks based on the method, compared with the prior art, the method reduces the search process, shortens the unreachable time of the service, and further improves the user experience.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like.
The above-mentioned preferred embodiments, further illustrating the objects, technical solutions and advantages of the present invention, should be understood that the above-mentioned are only preferred embodiments of the present invention and should not be construed as limiting the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (20)

1. A single-card terminal, comprising:
the 2G processing module is used for preferentially residing the CS domain in the 2G network and executing the CS domain service;
the 3G processing module is used for preferentially residing the PS domain in the 3G network and executing the PS domain service;
the 3G processing module is also used for detecting the signal intensity of the 3G network; when the 3G processing module detects that the signal strength of the 3G network is not higher than the first threshold and lasts for the first time, the 2G processing module is further configured to determine whether the 2G network meets the PS domain residing condition, and if so, reside the PS domain in the 2G network, and execute the PS domain service in the 2G network.
2. The terminal of claim 1, wherein when the PS domain is camped onto a 2G network, the 3G processing module is further to:
and when the signal strength of the 3G network obtained by detection is not lower than a set second threshold and lasts for a second time, the PS domain is resided in the 3G network, and the PS domain service is executed in the 3G network.
3. The terminal of claim 1 or 2, wherein:
the 2G processing module is also used for detecting the signal intensity of the 2G network;
when the 2G processing module detects that the signal intensity of the 2G network is not higher than the third threshold and lasts for a third time, the 3G processing module is further configured to determine whether the 3G network meets a CS domain residing condition, and if so, reside the CS domain in the 3G network, and execute a CS domain service in the 3G network.
4. The terminal of claim 3, wherein the 2G module, when the CS domain is camped onto the 3G network, is further to:
and when the detected 2G network signal strength is not lower than the set fourth threshold and lasts for the fourth time, the CS domain is resided to the 2G network, and the CS domain service is executed in the 2G network.
5. The terminal of claim 4, wherein:
one or more of the first threshold, the second threshold, the third threshold, the first time, the second time, the third time, and the fourth time is obtained through local configuration or network delivery.
6. The terminal of claim 3, wherein:
the 2G processing module is specifically configured to determine whether the 2G network meets the PS domain residence condition by:
judging whether the CS domain resides in the 2G network, if so, judging that the 2G network meets the PS domain residence condition, otherwise, judging that the 2G network does not meet the PS domain residence condition; or,
judging whether the signal intensity of the 2G network is greater than a fifth threshold, if so, judging that the 2G network meets the PS domain residence condition, otherwise, judging that the 2G network does not meet the PS domain residence condition;
the 3G processing module is specifically configured to determine whether the 3G network meets a CS domain residence condition by:
judging whether the PS domain resides in the 3G network, if so, judging that the 3G network meets the residence condition of the CS domain, otherwise, judging that the 3G network does not meet the residence condition of the CS domain; or,
and judging whether the signal intensity of the 3G network is greater than a sixth threshold, if so, judging that the 3G network meets the residence condition of the CS domain, and otherwise, judging that the 3G network does not meet the residence condition of the CS domain.
7. The terminal of claim 1, wherein:
configuring the value of the first threshold as a proper value so as to avoid causing frequent reselection when the value is too large and reducing the PS domain service connection rate when the value is too small; and meanwhile, the terminal is allowed to reside in the 3G network as much as possible.
8. The terminal of claim 1, wherein:
the first threshold is less than the second threshold to avoid ping-pong reselection.
9. The terminal of claim 1, wherein:
when the PS domain is in the 3G network and is in a service state, the 3G processing module is further configured to perform cell update when a radio link is out of step, and if the update is unsuccessful, the PS domain is camped on the 2G network.
10. The terminal of claim 1, wherein:
and when the PS domain is positioned in the 3G network and is in a service state, judging whether the threshold value used when the PS domain is resided in the 2G network is smaller than the threshold value used when the PS domain is positioned in the 3G network and is in an idle state, and judging whether the PS domain is resided in the 2G network.
11. A method for network reselection, comprising the steps of:
preferentially residing the CS domain in the 2G network and executing the CS domain service;
preferentially residing the PS domain in the 3G network and executing the PS domain service;
detecting the signal intensity of the 3G network, judging whether the 2G network meets the PS domain residing condition or not when detecting that the signal intensity of the 3G network is not higher than a first threshold and lasts for a first time, residing the PS domain to the 2G network if the signal intensity of the 2G network meets the PS domain residing condition, and executing PS domain service in the 2G network.
12. The method of claim 11, wherein when the PS domain is camped onto a 2G network, the method further comprises:
and when the signal strength of the 3G network obtained by detection is not lower than a set second threshold and lasts for a second time, the PS domain is resided in the 3G network, and the PS domain service is executed in the 3G network.
13. The method of claim 11 or 12, further comprising:
detecting the signal intensity of the 2G network;
and when the signal intensity of the 2G network is detected to be not higher than a third threshold and lasts for a third time, judging whether the 3G network meets the CS domain residing condition, if so, residing the CS domain in the 3G network, and executing the CS domain service in the 3G network.
14. The method of claim 13, wherein when the CS domain resides in a 3G network, further comprising:
and when the 2G network signal strength is detected to be not lower than the fourth threshold and lasts for the fourth time, the CS domain is resided to the 2G network, and CS domain services are executed in the 2G network.
15. The method of claim 14, wherein:
one or more of the first threshold, the second threshold, the third threshold, the first time, the second time, the third time, and the fourth time is obtained through local configuration or network delivery.
16. The method of claim 13, wherein:
the judging whether the 2G network meets the PS domain residence condition comprises:
judging whether the CS domain resides in the 2G network, if so, judging that the 2G network meets the PS domain residence condition, otherwise, judging that the 2G network does not meet the PS domain residence condition; or,
judging whether the signal intensity of the 2G network is greater than a fifth threshold, if so, judging that the 2G network meets the PS domain residence condition, otherwise, judging that the 2G network does not meet the PS domain residence condition;
the judging whether the 3G network meets the CS domain comprises:
judging whether the PS domain resides in the 3G network, if so, judging that the 3G network meets the residence condition of the CS domain, otherwise, judging that the 3G network does not meet the residence condition of the CS domain; or,
and judging whether the signal intensity of the 3G network is greater than a sixth threshold, if so, judging that the 3G network meets the residence condition of the CS domain, and otherwise, judging that the 3G network does not meet the residence condition of the CS domain.
17. The method of claim 11, wherein:
configuring the value of the first threshold as a proper value so as to avoid causing frequent reselection when the value is too large and reducing the PS domain service connection rate when the value is too small; and meanwhile, the terminal is allowed to reside in the 3G network as much as possible.
18. The method of claim 11, wherein:
the first threshold is less than the second threshold to avoid ping-pong reselection.
19. The method of claim 11, wherein:
and when the PS domain is positioned in the 3G network and is in a service state, updating the cell when the wireless link is out of step, and if the updating is unsuccessful, residing the PS domain in the 2G network.
20. The method of claim 11, wherein:
and when the PS domain is positioned in the 3G network and is in a service state, judging whether the threshold value used when the PS domain is resided in the 2G network is smaller than the threshold value used when the PS domain is positioned in the 3G network and is in an idle state.
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Application publication date: 20110720