JP5236577B2 - Service state management server and wireless communication system - Google Patents

Description

  The present invention relates to a service state management server applied to a radio communication system in which at least one radio system among a plurality of different radio systems is selected and radio communication is performed between a mobile station apparatus and a base station apparatus, and radio communication using the same About the system.

  Conventionally, in a single radio system, transmission quality parameters specific to each system are measured, and time and frequency slot switching in the system is performed to improve the utilization efficiency of the system. For example, an RSSI value in WI-LAN and a CINR value in WiMAX correspond to these transmission quality parameters. As a conventional management method, for example, a single mobile phone system such as CDMA2000 has been proposed.

  As a method for maintaining and improving the communication quality of the service area as described above, for example, Japanese Patent Laid-Open No. 2002-271833 or Japanese Patent Laid-Open No. 10-262007 has been proposed. In these methods, in a single mobile communication system, the mobile communication terminal device used by a user sends quality information together with location information to a management server, or receives electric field strength of radio waves transmitted by a mobile communication base station. This is a method for managing area measurement data and position data indicating the above, and is not intended for a plurality of communication systems.

JP 2002-271833 A Japanese Patent Laid-Open No. 10-262007

Sasakawa et al., Analysis of moving position of Markov moving model (The IEICE Transactions, Vol.J80-B-II, No.12, December 1997)

  The demand for mobile radio is expected to increase further and higher quality is expected. As a next-generation promising candidate that can cope with such a situation, a system that effectively utilizes a plurality of different existing communication systems and further enhances the system can be considered. When such a heterogeneous wireless system is employed, it is important to advise the wireless terminal on the optimal communication system for the user.

  The present invention has been made in view of such circumstances, and services received by a terminal when managing the status of a service on the network side and selecting one system from a plurality of wireless systems or bundling a plurality of systems. It is an object of the present invention to provide a service state management server and a wireless communication system capable of probabilistically managing the state of the wireless communication and notifying an optimal wireless system.

  (1) In order to achieve the above object, the present invention takes the following measures. That is, the service status management server of the present invention is applied to a radio communication system in which at least one radio system is selected from a plurality of different radio systems and a mobile station apparatus and a base station apparatus perform radio communication, and a service providing area And a service state management server that divides the provision time into a plurality of unit areas and unit times in which the state of the mobile station apparatus related to communication can be regarded as steady, and manages the service state for each unit area and unit time. A numerical value indicating the state of the mobile station apparatus in any unit area and unit time is acquired from the station apparatus or the base station apparatus, a service state numerical value storage unit for storing the acquired numerical values, and a numerical value indicating the state of the mobile station apparatus The probability that the mobile station apparatus will be in a state related to a specific communication in any unit area and unit time based on Based on the stochastic process, both the state probability and the transition probability indicating the probability that the mobile station apparatus enters a state related to another communication from the state related to a specific communication are calculated, and the mobile station apparatus in any unit region and unit time Based on the state probability and the transition probability, the service state calculation unit for calculating the steady state probability and the transition probability in the unit region and unit time constituting the service provision region and the provision time, and the service for storing the calculated service state And a state management database.

  Thus, by storing the steady state probability and transition probability in the unit area and unit time constituting the service providing area and the providing time in the service state management database, the use of the mobile station apparatus can be performed using this information. A communication system to be selected or bundled can be selected and notified to the mobile station apparatus so that the service quality and the communication line capacity are optimized according to the place and the use time zone. Further, the service state management database obtains a numerical value indicating the state of the mobile station device in any unit region and unit time from the mobile station device or base station device, and provides the service providing region and provision within the service state management server. By calculating the steady state probability and transition probability in the unit area and unit time constituting the time, there is an advantage that the configuration of the small zone can be flexibly changed compared to the case where statistical processing is performed in the mobile station device. is there.

  (2) The service state management server of the present invention is applied to a radio communication system in which at least one radio system is selected from a plurality of different radio systems and a mobile station apparatus and a base station apparatus perform radio communication. A service state management server that divides a service provision area and a provision time into a plurality of unit areas and unit times in which the state of a mobile station apparatus related to communication can be regarded as steady, and manages the service state for each unit area and unit time. In any unit region and unit time, a state probability indicating the probability that the mobile station apparatus enters a state related to a specific communication, and a probability that the mobile station apparatus changes from a state related to a specific communication to a state related to another communication A service that acquires both transition probabilities from mobile station devices or base station devices and stores the acquired state probabilities and transition probabilities Based on the state value storage unit and the state probability and transition probability of the mobile station apparatus in any unit region and unit time, the steady state probability and transition in the unit region and unit time constituting the service provision region and provision time A service state calculation unit that calculates a probability, and a service state management database that stores a steady state probability and a transition probability in each calculated unit region.

  Thus, by storing the steady state probability and transition probability in the unit area and unit time constituting the service providing area and the providing time in the service state management database, the use of the mobile station apparatus can be performed using this information. A communication system to be selected or bundled can be selected and notified to the mobile station apparatus so that the service quality and the communication line capacity are optimized according to the place and the use time zone. In addition, the service state management database indicates a state probability indicating a probability that the mobile station device is in a state related to a specific communication in any unit region and unit time, and the mobile station device relates to another communication from a state related to the specific communication. By acquiring both transition probabilities indicating the probability of becoming a state from the mobile station apparatus or the base station apparatus, the storage capacity and the processing amount of the service state management database can be reduced by the amount that statistical processing is not performed.

  (3) Further, in the service state management server of the present invention, the service state calculation unit calculates a transition probability between unit areas every unit time, and the service state management database stores the transition between the calculated unit areas. Stores the probability.

  As described above, the service state management database stores transition probabilities between unit areas, so that, for example, even when a mobile station apparatus straddles between unit areas, the service state management database depends on the use location and use time zone of the mobile station apparatus. Thus, it is possible to select a communication system to be selected or bundled so as to optimize the service quality and the communication line capacity, and notify the mobile station apparatus.

  (4) Further, in the service state management server of the present invention, the service state calculation unit uses a certain period as a unit (it can also be considered as a set of unit times) and is constantly in the unit area constituting the service providing area. A state probability and a transition probability are calculated.

  As described above, the service state management database stores the steady state probability and transition probability in the unit area constituting the service providing area in units of a certain period, so that communication can be performed according to time zone, day of week, weekday / holiday. When the situation changes, select the communication system to be selected or bundled so that the service quality and the communication line capacity are optimal depending on the day of the week, weekday / holiday, as well as the place of use and time of day, and the mobile station device Notification can be made.

  (5) Moreover, the radio | wireless communications system of this invention is comprised from the service state management server in any one of said (1)-(4), a mobile station apparatus, and a base station apparatus, It is characterized by the above-mentioned. And

  Thus, by storing the steady state probability and transition probability in the unit area and unit time constituting the service providing area and the providing time in the service state management database, the mobile station apparatus can be used according to the usage location and the usage time zone. Thus, it is possible to select a communication system to be selected or bundled so as to optimize the service quality and the communication line capacity, and notify the mobile station apparatus.

  According to the present invention, it is possible to probabilistically manage the status of services received by a terminal using location information and time as keys. By using this information, it is possible to control heterogeneous radios (multiple radios) for the purpose of effective use of frequencies and improvement of line quality, which seems to be suitable for users or service providers. Communication systems can be provided to users. For example, (1) Advise the most effective communication service when the terminal is turned on, (2) Turn off some media when multiple media are available (for example, when three are available) For example, turning one off).

It is a figure which shows the service state management system in mobile communication. It is a figure (Venn diagram) which shows the concept of a service state. It is a state transition diagram when it is assumed that there is no transition between S0 and S3 and between S1 and S2. FIG. 5 is a state diagram (Venn diagram) when a zone is divided into two stages of a weak electric field and a strong electric field in a heterogeneous wireless system. It is a state transition diagram corresponding to the case where the area is divided into two stages (FIG. 4). FIG. 6 is a state transition diagram in the case where both the state transition in the small zone 7 and the state transition between the small zones 7 are taken into consideration. 1 is a block diagram showing a schematic configuration of a wireless communication system according to a first embodiment. It is a block diagram which shows schematic structure of the radio | wireless communications system which concerns on 2nd Embodiment. It is a block diagram which shows schematic structure of the radio | wireless communications system which concerns on 3rd Embodiment. It is a conceptual diagram of the database structure of the service state management system in mobile communication when the heterogeneous wireless compatible terminal 1 or the wireless device base station 3 transmits raw information data to the service state management server 5. FIG. 3 is a conceptual diagram of a database structure of a service state management method in mobile communication when a service state is statistically processed and transmitted to a service state management server 5 in a heterogeneous wireless terminal 1 or wireless device base station 3.

  Embodiments of the present invention will be described below with reference to the drawings. The present embodiment relates to a service state management method for a wireless system for effectively coordinating them in a heterogeneous wireless environment in which a plurality of different mobile wireless systems operate simultaneously. This service status management method is the basic information for the optimal method when selecting one system from multiple wireless systems or bundling multiple systems in order to make effective use of frequency and further improve reliability. . More specifically, the present invention relates to a method for dividing the area of a mobile radio communication system into unit areas, and managing the quality of service quality of communication available to a terminal in each unit area based on a probability process and a transition probability and a state probability. . The unit area refers to an area obtained by dividing the service providing area to such an extent that the state of the mobile station apparatus related to communication can be regarded as steady, and this is hereinafter referred to as a small zone.

  FIG. 1 is a diagram showing a service state management method in mobile communication. The service status information from the heterogeneous radio compatible terminal 1 or the radio device base station 3 is managed by the service status management server 5 for each small zone 7. Depending on the communication system, information from the heterogeneous wireless compatible terminal 1 may be sent to the service state management server 5 via the access point 9. The wireless device base station 3 and the service state management server 5 are connected by a network 11. Here, the small zone 7 is a range on the map, and refers to a range in which the service state can be regarded as steady. The service status information sent from the heterogeneous wireless compatible terminal 1 or the wireless device base station 3 includes location, time, available system, and detailed parameters, that is, in-range / out-of-range, RSSI, CINR, BER, delay amount, jitter Amount, throughput, packet loss rate, packet error rate, and the like. For the sake of explanation, FIG. 1 shows a state in which a plurality of different mobile radio systems are operating simultaneously. Specific examples of the communication system include a mobile phone (EVDO) 13, Wi-Fi 15, PHS 17, and WiMAX 19.

  The service state management server 5 records the transition probability and state probability of the service state. Since there is a certain relationship between the transition probability and the state probability, if there is an element that cannot be measured, it may be derivable by calculation from known information.

FIG. 2 is a diagram (Venn diagram) showing the concept of the service state. First, for the sake of simple explanation, a wide range system and a narrow range system are targeted as a plurality of different communication systems. Also, two service states are considered: out of service area and service area (an example of a weak electric field and a strong electric field in the service area will be shown later as a slightly complicated state). It is assumed that the terminal power supply is always ON. It should be noted that FIG. 2 represents the state in the small zone 7 and does not show the service area on the actual map. In FIG. 2, there are four states, which are represented by out-of-service area S ₀ , communication only in the wide area system S ₁ , communication in only the narrow area system S ₂ , and communication in both the wide area system and the narrow area system S ₃ .

Equation (1) shows the relationship between the transition probability P of these states and the state probability S in the small zone 7, and is described in an information theory textbook (for example, “Information Theory” by Imai). Shoshodo, Chapter 3, 1984). The component P _xy of the transition probability P is a transition probability from the state S _x to S _y .

となる。サービス状態の情報全てが得られる場合は、式（１）の全ての要素が管理できるが、もし測定不能あるいは不確かさが大きな要素については、上記の関係から計算できる。但し、未知数が多い場合（例えば、上式では５以上）には、計算できないこともある。

It becomes. When all the service status information can be obtained, all elements of Equation (1) can be managed, but elements that cannot be measured or have large uncertainties can be calculated from the above relationship. However, when there are many unknowns (for example, 5 or more in the above formula), calculation may not be possible.

Assuming actual communication, if the mobile terminal has both wide area service and narrow area service communication functions, in the state shown in FIG. That is,
-State probability: S ₁ , S ₂ , S ₃
Transition probability: a component other than P _X0 and P _0X . Accordingly, the seven components of the first row and the first column of the matrix P are unknown. Furthermore, since the sum of the components of each matrix is 1, the first column can be calculated except for the first row. If the diagonal components (for example, P ₁₀ and P ₀₁ ) are equal, the entire transition matrix can be calculated after all.

  As described above, the state in the small zone 7 can be managed by using the probability that can be actually measured and the probability that can be calculated from these numerical values in the heterogeneous wireless system environment using the equation (1). . These probabilities need to be measured within a time range that can be regarded as stationary. For example, when communication traffic greatly differs such as during the night and during the day, it is necessary to treat them separately.

In the normal case, in FIG. 2, the state transition probabilities between out-of-service S ₀ and S ₃ that can communicate in both wide-area and narrow-area systems, and between S ₁ and S ₂ may be considered to be extremely small. In that case, equation (1) is simplified as equation (4). In the Venn diagram of FIG. 2, this corresponds to a transition that is in contact with a point instead of a line.

図３は、Ｓ_０〜Ｓ_３間、Ｓ_１〜Ｓ_２間の遷移が無いと仮定した場合の状態遷移図である。ここで、右肩のインデックス（０，０等）は、後に述べる小ゾーン７の遷移を考慮した、小ゾーン７を識別する為のものである。

FIG. 3 is a state transition diagram when it is assumed that there is no transition between S _{0 and} S _{3 and} between S _{1 and} S ₂ . Here, the index on the right shoulder (0, 0, etc.) is for identifying the small zone 7 in consideration of the transition of the small zone 7 described later.

Moreover, Formula (1) is a general expression, and even if S ₂ is included in S ₁ and S ₂ = S ₃ , there is no problem, and the transition probability P in that case is as follows.

図４は、異種無線システムで圏内を弱電界１０１と強電界１０３の２段階に分けた場合の状態図（ベン図）である。この図において遷移確率が極めて小さくゼロとみなせることを考慮した場合の遷移確率Ｐと状態確率Ｓは、以下となる。

FIG. 4 is a state diagram (Venn diagram) when the area is divided into two stages of a weak electric field 101 and a strong electric field 103 in a heterogeneous wireless system. In this figure, the transition probability P and the state probability S when considering that the transition probability is extremely small and can be regarded as zero are as follows.

図５は、圏内を２段階に分けた場合（図４）に対応する状態遷移図である。このように、状態を増やすと、複雑になってくる。

FIG. 5 is a state transition diagram corresponding to the case where the area is divided into two stages (FIG. 4). In this way, increasing the state becomes more complicated.

  In the above, the transition in the small zone 7 is targeted, but the case where the transition between the small zones 7 is also considered will be described below. The state transition in the small zone 7 will be described assuming a simple case as shown in FIG.

FIG. 6 is a state transition diagram in the case where both the state transition in the small zone 7 and the state transition between the small zones 7 are taken into account. In the example of the state transition diagram, the center small zone R ^0,0 is considered. For the sake of simplicity, there are four transitions between adjacent small zones in the horizontal direction. Note that this number is maximum (3 × 3 × 3) −1 = 26 when considered on the map and considered both horizontally and vertically.

The transition probability and state probability in the case of FIG. 6 can be expressed by the following equations. As a premise of this formula, the boundary condition of the moment across the small zone is
(Final state of the immediately preceding small zone) = (initial state of the immediately following small zone)
Is assumed. This assumption is considered reasonable in practice.

ここで、
Q^{(l,m),(l’,m’)}：小ゾーンR^(l,m)から R^(l’,m’)への遷移確率
T：小ゾーンの遷移を考慮した場合の遷移確率
P ^(l,m)：小ゾーンR^(l,m) 内での遷移確率
S ^(l,m)：小ゾーンR^(l,m) 内での状態確率
であり、S ^(l,m) ・P ^(l,m) = S^(l,m)
が成り立つ。

here,
Q ^{(l, m), (l ', m')} : Transition probability from small zone R ^{(l, m)} to R ^{(l ', m')}
T: Transition probability when considering small zone transitions
P ^{(l, m)} : Transition probability in small zone R ^{(l, m)}
S ^{(l, m)} : State probability in the small zone R ^{(l, m)} , S ^{(l, m)}・ P ^{(l, m)} = S ^{(l, m)}
Holds.

This state transition is a state transition that can be applied only to R ^0,0 , and in a different small zone 7, it is necessary to consider the transition probability centered on that zone.

  As described above, by expressing the state probability and the state transition probability by numerical values, it is possible to mathematically manage the service state of the mobile communication system using the heterogeneous wireless system together. Even in this case, it is necessary to measure the probability within a time range that can be regarded as steady. In addition, as described in the section of state transition in the small zone 7, in the information obtained from the heterogeneous wireless compatible terminal 1 or the wireless device base station 3, elements that cannot be measured or are considered to be low in reliability It is possible to calculate using the equation (7) and manage all the states (there may be a case where the calculation cannot be performed due to the small number of measurements).

(First embodiment)
FIG. 7 is a block diagram illustrating a schematic configuration of the wireless communication system according to the first embodiment. FIG. 7 shows a system configuration when it is assumed that the wireless communication part of the heterogeneous wireless compatible terminal 1 grasps the service state and notifies the service state management server 5. The heterogeneous wireless compatible terminal 1 having a plurality of wireless devices 201 notifies the service state measuring unit 203 of the service state in each wireless device. The wireless selector 205 selects a communication system with which communication has been confirmed, and transmits the service status together with information data generated at the user data terminal 207 to the wireless device base station 3 corresponding to the wireless device. Here, the user data terminal 207 is included in the heterogeneous wireless compatible terminal 1 (the part surrounded by the broken line in FIG. 7). For example, the user data terminal 207 is like a laptop computer and integrated with the wireless communication part. It does not have to be. In that case, the wireless device 201 and the wireless selector 205 function as a modem. The service status information is further notified to the service status management server 5 through the network 11 such as the Internet.

  In the service state management server 5, the service state numerical value storage unit 211 records information transmitted from a large number of user data terminals 207 as it is. The service state calculation unit 213 statistically processes information from the user data terminal 207, calculates transition probabilities and state probabilities from the relationship obtained by the above determinant, and calculates the results for each zone in the service state management database 215. To record. In this embodiment, the quality parameters that can be measured are low layer information, ie, within / out of range, RSSI, CINR, BER, and the like.

(Second Embodiment)
FIG. 8 is a block diagram illustrating a schematic configuration of a wireless communication system according to the second embodiment. FIG. 8 shows a system configuration when it is assumed that both the wireless communication part of the heterogeneous wireless compatible terminal 1 and the wireless device base station 3 grasp the service state and notify the service state management server 5. A service state measuring unit 301 is added to the wireless device base station 3 in the system of FIG. Also in this embodiment, the quality parameters that can be measured are low layer information, that is, within / out of range, RSSI, CINR, and BER.

(Third embodiment)
FIG. 9 shows the movement when it is assumed that the user data terminal 207 grasps the service status and notifies the service status management server 5 in addition to the radio communication portion of the heterogeneous radio compatible terminal 1 and the radio device base station 3. It is a system figure explaining the service state management system in body communication. A service state measuring unit 401 is added to the user data terminal 207 in the system of FIG. In this embodiment, quality parameters that can be measured include high layer information, for example, throughput and transmission delay in an application, in addition to low layer information.

  Note that when the wireless selector 205 selects the wireless device 201, the service state management server side may issue a unidirectional instruction to the wireless selector 205, or the user may select the wireless selector 205 at the user data terminal 207. The wireless device 201 may be selected by operating.

(Fourth embodiment)
FIG. 10 is a conceptual diagram of a database structure of a service state management method in mobile communication when the heterogeneous wireless compatible terminal 1 or the wireless device base station 3 transmits raw information data to the service state management server 5. In this figure, the heterogeneous wireless compatible terminal 1 or the wireless device base station 3 sends the service state raw information data together with the time and position signal to the service state numerical value storage unit 211, statistically processes the service state calculation unit 213, The state management database 215 manages the service state based on a stochastic process. In this case, there is an advantage that the configuration of the small zone 7 can be flexibly changed, but the storage capacity of the service state numerical value storage unit 211 and the processing amount of the service state calculation unit 213 are increased. Since the management method according to the present invention is based on a stochastic process, the service state measurement may be as short as 1 second, for example, or the raw data transmission interval may be as long as 1 minute, for example.

(Fifth embodiment)
FIG. 11 is a conceptual diagram of the database structure of the service state management method in mobile communication when the service state is statistically processed by the heterogeneous wireless terminal 1 or the wireless device base station 3 and transmitted to the service state management server 5. is there. It is assumed that the service state is statistically processed by the heterogeneous radio compatible terminal 1 or the radio device base station 3 and transmitted to the service status management server 5. A transition probability and a state probability are received from the device base station 3, and a large number of data are processed to create a steady transition probability and a state probability. In this case, the heterogeneous wireless compatible terminal 1 or the wireless device base station 3 needs to know the identification number of the small zone 7, so information must be notified from the service state management server 5.

DESCRIPTION OF SYMBOLS 1 Dissimilar radio | wireless terminal 3 Base station for wireless apparatuses 5 Service state management server 7 Small zone 211 Service state numerical value storage part 213 Service state calculation part 215 Service state management database

Claims (5)

The mobile station apparatus is applied to a radio communication system in which at least one radio system is selected from a plurality of different radio systems and a mobile station apparatus and a base station apparatus perform radio communication, and a service providing area and a providing time are set according to the communication. A service state management server that manages a service state for each unit region and unit time by dividing the state into a plurality of unit regions and unit time that can be regarded as steady,
From the mobile station device or the base station device, obtain a numerical value indicating the state of the mobile station device in any one of the unit area and unit time, and a service state numerical value storage unit that stores the acquired numerical value;
Based on a numerical value indicating the state of the mobile station apparatus, a state probability indicating the probability that the mobile station apparatus is in a state related to a specific communication in any one of the unit areas and unit time, and the mobile station apparatus is the specific Based on a probability process, both the transition probabilities indicating the probability of becoming a state related to other communication from the state related to other communication are calculated, and based on the state probability and transition probability of the mobile station device in any one of the unit regions and unit time A service state calculation unit for calculating steady state probabilities and transition probabilities in unit areas and unit times constituting the service providing area and providing time;
And a service state management database for storing the calculated service state. The mobile station apparatus is applied to a radio communication system in which at least one radio system is selected from a plurality of different radio systems and a mobile station apparatus and a base station apparatus perform radio communication, and a service providing area and a providing time are set according to the communication. A service state management server that manages a service state for each unit region and unit time by dividing the state into a plurality of unit regions and unit time that can be regarded as steady,
A state probability indicating the probability that the mobile station apparatus enters a state related to a specific communication in any one of the unit areas and unit time, and a probability that the mobile station apparatus changes from a state related to the specific communication to a state related to another communication. A service state numerical value storage unit for acquiring both of the transition probabilities indicating from the mobile station device or the base station device, and storing the acquired state probability and transition probability,
Based on the state probability and transition probability of the mobile station apparatus in any one of the unit regions and unit time, the steady state probability and transition probability in the unit regions and unit time constituting the service provision region and provision time are calculated. A service status calculator;
And a service state management database storing a steady state probability and a transition probability in each of the calculated unit areas and unit time. The service state calculation unit calculates a transition probability between unit areas for each unit time,
3. The service state management server according to claim 1, wherein the service state management database stores a transition probability between the calculated unit areas.   The said service state calculation part calculates the steady state probability and transition probability in the unit area | region which comprises the said service provision area | region for a fixed period as a unit, Any one of Claim 1 to 3 characterized by the above-mentioned. Service status management server described in 1. The service state management server according to any one of claims 1 to 4,
A mobile station device;
And a base station apparatus.

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