JP2002010341A - Mobile communication system, mobile terminal, base station controller, and packet data service node - Google Patents

Abstract

(57) [Summary] In a mobile data communication system having a packet switching function, communication quality assurance is realized. Kind Code: A1 In a mobile communication system having a packet switching function of sharing a radio resource among a plurality of mobile terminals, a mobile terminal that has generated a communication quality request periodically transmits a wireless channel priority use request packet. By doing so, when the transmission and reception of the signal is not performed for a certain period of time, to avoid the timeout of the state transition timer that executes the transition to the dormant state by deallocating the wireless channel,
It is possible to maintain the active state and continuously maintain the wireless channel. Further, when the communication quality requesting terminal moves between cells or requests for assignment of a radio channel, the base station control apparatus transmits a priority request packet so that the base station control device can receive the priority assignment of the radio channel. Control the radio base station.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a mobile communication system, and more particularly, to a mobile communication system having a communication quality assurance function, a mobile terminal, a base station controller, and a packet data service node.

[0002]

2. Description of the Related Art Conventionally, for example, 3rd Generation Partnership Project 2 (3GPP
Stage 3 description of Ax interf
As described in ace rev.1 (3gpp2-ACO-19990927-0), in a mobile communication system, in order to use a wireless channel effectively, a wireless channel is established between a plurality of terminals using a packet switching method. There is a known way to share.
In this method, when a request for transmission or reception of a signal occurs, each mobile terminal transmits and receives a signal in the form of a packet using a radio channel shared with other terminals, and there is no transmission / reception request. In such a case, the wireless channel is released so that another mobile terminal can use the wireless channel. However, for a mobile terminal that has not transmitted or received a packet for a certain period of time, the radio channel itself is released.

[0003]

In the above-described mobile communication system, when a transmission / reception request is issued again to a mobile terminal whose radio channel has been deallocated, a radio channel is allocated to the mobile terminal. However, there is a possibility that an allocatable free wireless channel cannot be secured. In a mobile communication system, with the movement of the mobile terminal between cells,
It is necessary to receive a wireless channel assignment from a wireless base station that controls the destination cell. In this case, too, there is a possibility that an allocatable free wireless channel cannot be secured. This is an important issue in communication quality assurance when performing communication requiring high reliability such as electronic commerce.

[0004] An object of the present invention is to continue to receive radio channel assignment regardless of the packet transmission / reception interval when priority use of a radio channel is required, and to give priority to radio channel assignment requests. An object of the present invention is to provide a mobile terminal having means for receiving assignment of a wireless channel.

Another object of the present invention is to continuously assign a radio channel to a mobile terminal that has issued a request for preferential use of a wireless channel regardless of the packet transmission / reception interval, and to provide a mobile terminal that has issued a request for preferential use. An object of the present invention is to provide a base station controller having means for preferentially allocating a radio channel when a terminal requests radio channel allocation.

It is another object of the present invention to provide a packet data service node having means for causing a mobile terminal that has issued a request for preferential use of a wireless channel to preferentially use the wireless channel.

Another object of the present invention is to continuously assign a radio channel to a mobile terminal that has issued a request to use a wireless channel irrespective of the packet transmission / reception interval, and to provide a mobile terminal that has issued a request to use a wireless channel preferentially. An object of the present invention is to provide a mobile communication system capable of assigning a wireless channel preferentially when a mobile terminal requests assignment of a wireless channel.

[0008]

To achieve the above object, according to the present invention, a mobile terminal requesting preferential use of a radio channel periodically transmits a priority request to a radio base station. However, the wireless base station receiving the priority request periodically transmits a response to the priority request terminal. As a result, periodic transmission / reception is performed between the mobile terminal issuing the priority use request and the radio base station. If the transmission / reception cycle is shorter than the time until the channel assignment is released, the mobile The terminal may continue to receive radio channel assignments.

Further, according to the present invention, the base station control device controlling the radio base station separately manages the priority terminal using the radio channel preferentially and the non-priority terminal other than the priority terminal. The non-priority terminal has means for managing the order of elapsed time (wireless channel unused time) since the last signal transmission or reception with the wireless base station. Therefore, if the mobile terminal that has issued the request for preferential use of the radio channel requests radio channel allocation, and there is no available radio channel that can be allocated to the radio base station, the base station controller will For the station,
It is possible to release the assignment of the wireless channel in order from the mobile terminal having the longest unused wireless channel time among the non-priority terminals, and control the wireless channel to be assigned to the preferential use request terminal.

[0010]

FIG. 1 shows an example of the configuration of a mobile data communication system 101 to which the present invention is applied. The system includes a plurality of mobile terminals (hereinafter referred to as MS) 102
And base stations (hereinafter referred to as BSs) 104 (104A to 104) for transmitting and receiving signals to and from the MS 102 existing in the service area of the cell 103 (103A to 103F).
4F) and a base station controller (hereinafter referred to as BSC) 105 (105A-105) that integrally manages a plurality of base stations 104.
D) and a packet data service node (hereinafter PDSN) 106 (1) connected to the radio access network 110 and having an IP packet routing function.
06A, 106B) and a home agent (hereinafter, referred to as HA) 10 for realizing the movement of the terminal between the PDSNs 106.
8 and a gateway router 107 (1) connecting to the external network, ie, the Internet or a corporate LAN.
07B, 107C) and a packet core network 109 composed of a router 107A connecting the router and the PDSN 106.

FIG. 2 is a diagram showing an example of mapping a connection between the MS 102 and the PDSN 106. MS10
2 and the BSC 105, a wireless channel 203
A link layer connection 202 is set between the network 105 and the PDSN 106, and the PPP connection 201 is mapped to both connections. The BSC 105 manages the mapping change between the radio channel 203 and the link layer connection 202 caused by the movement of the mobile terminal, thereby realizing the movement between the BS 104 of the MS 102 and the PDSN 106 changing the mapping between the PPP connection 201 and the link layer connection 202. By managing, the movement between the BSCs 105 of the MS 102 is realized. FIG. 4 shows an example of the configuration of the MS 102 to which the present invention is applied. The MS 102 has an antenna 40
4, a code for transmitting and receiving data via the antenna,
A transmission / reception processing unit 403 for performing decoding processing, a user interface unit 401, a control unit 402 for controlling the user interface unit and performing data protocol processing and having an interface with the transmission / reception processing unit, and a battery 4
15. The user interface unit 401
The display unit 407 includes a display unit 407, a switch unit 416, a speaker 413, and a microphone 414. The switch unit 416 includes a power switch 408 for turning on / off the power, a dial key 409 for inputting numbers and characters, calling, starting a call when receiving a call, Select key 410 for starting a data service, scroll key 411 for scrolling a display unit, and communication quality assurance in response to an input from a user or an instruction from a control unit 402 in response to a service used by the user. It has a requesting QoS key 412.
The control unit 402 starts a service in response to a request input from the switch unit 416, executes a protocol process for transmission / reception traffic related to the service, executes a control of the display unit, and a ROM 406 which is a memory for storing those programs. , Which is a memory for storing state information necessary for protocol processing and a radio resource state. A bus 417 connects 401, 402, and 403 to each other, and exchanges data and programs.

FIG. 5 shows an example of the configuration of the BSC 105. The BSC 105 includes a management unit 501, a base station I / F port unit 510, and a network I / F unit 511, and each unit is connected via a packet bus 509. The management unit 501 includes a processor 503 that performs radio resource management of each BS 104, performs conversion between the link layer connection 202 and the radio channel 203, a memory 502 that stores these programs, a radio channel code management table that is an identifier of the radio channel, and It is composed of a memory cache 504 for arranging a radio channel code and a table for managing radio resource status provided for MS correspondence, a buffer memory 505 for temporarily storing data to be transferred, a buffer memory controller 506, a hard disk 507, and a hard disk controller 508. . BS
104 is configured to be connected via a base station I / F port unit 510, and this embodiment shows a configuration that can be connected to four BSs 104. The PDSN 106 is connected via a network I / F unit 511.

FIG. 6 shows a configuration example of the PDSN.
PDSN includes a management unit 601, one or more routing units 6
02, and each unit is connected via a packet bus 603. The management unit 601 includes a memory 605A for storing a program for creating a packet routing table,
A processor 610A for executing the program, a memory cache 611A for arranging a packet routing table and information on the MS, a buffer memory 606A for storing the packet, a DMA transfer function of the packet between the buffer memory 606B of the routing unit 602, and a packet bus control. It comprises a buffer memory controller 607A having functions, a hard disk controller 608 and a hard disk 609. Processor 61
The packet routing table created by OA collects the location information of the MS 102 existing in the mobile data communication system 101 and notifies the HA 108 of the location information.
It manages the processing of the le IP, the setting of the PPP connection 201 with the MS 102, the setting of the link layer connection 202 with the BSC 105, the association of the IP tunneling of the Mobile IP with the PPP connection 201, and the association of the PPP connection 201 with the link layer connection 202. The routing unit 602 determines the HA1 based on the packet routing table created by the management unit.
610B, a memory 605B, and a buffer memory 6 that execute a packet transfer process between the BSC 105 and the BSC 105
06B, a buffer memory controller 607B, a memory cache 611B for arranging a packet routing table and the like created by the management unit, a port control unit 612 for connecting another router 107 and the like, and an internal bus. In the figure, one port control unit 612 supports four ports, and in this embodiment, one or more routers 107 and one or more BSCs 10 are connected via this port.
Connect to 5.

FIG. 7 is a transition diagram of radio resource states in packet switching. The state is a null state 701 in which the MS 102 is not connected to the mobile data communication system 101 (the power is not turned on and data cannot be transmitted / received), and the MS 102 is in the mobile data communication system 10.
1 and an active state 702 in which the wireless channel is allocated, and a dormant state 703 in which the MS 102 is connected to the mobile data communication system 101 but is not allocated the wireless channel. It consists of three states. Active state 702
If the MS 102 does not transmit or receive a signal for a certain period of time, the wireless channel is deallocated and enters the dormant state 703. In this mobile data communication system, only the MS in the active state 702 shown in FIG. 7 can perform packet transmission / reception with the BS 104, and the null state 701 or the dormant state 70
3 transmits or receives a packet, the BSC 1 uses a random access channel or a control channel.
Requesting the assignment of a radio channel to the BSC 05
It is necessary to make a transition to the active state 702 upon receiving a wireless channel assignment under the control of 105. The MS 102 that has failed to transition to the active state may request wireless channel allocation again after a certain period of time.

In order to realize the state transition shown in FIG.
The BSC 105 has a state transition timer 901B for each MS 102 in the management unit 501, and restarts the state transition timer 901B corresponding to the MS every time a signal is transmitted or received with the MS 102. This is shown in FIG. When the timer times out, the BSC 105 releases the assignment of the radio channel to the corresponding MS 102, and the MS 102 transitions from the active state 702 to the dormant state 703. In the mobile data communication system 101, even when the MS 102 is performing communication requiring high reliability such as a real-time application or e-commerce, the resource state becomes a dormant state unless a signal is transmitted and received for a certain period of time. The state transits to 703, where the assignment of the wireless channel is released. Also, when resuming signal transmission / reception, it is not always possible to secure a wireless channel that can be assigned, so that service utilization may not be possible.

According to the present invention, in order to solve such a problem,
If the user requires a preferential use of the wireless channel, the user can press the QoS key 412 of the MS 102 or M depending on the service that the user is using.
When the control unit 402 in S102 instructs preferential use of the wireless channel, the active state 70
2 to the dormant state 703 is avoided, and the wireless channel can be continuously allocated.

FIG. 8 shows the MS 10 in order to realize the continuous assignment of the radio channel assigned by the BS 104.
3 is a flow of a priority request input process performed in Step 2. When the user inputs the QoS key 412, or when the control unit 402 instructs a priority request according to the service or application used by the user, the MS 102
Turns on the QoS key state (801), and sets BSC1
In order to avoid the release of the wireless channel by the use of the wireless LAN 05, a PPP keep-alive packet is transmitted at regular intervals (802).

FIG. 18 shows a configuration example of a PPP keep-alive packet. PPP keep alive packet 18
00 is a field 18 for storing the identifier of the MS 102
01 and a field 1802 for storing the packet type information of the PPP keep-alive packet. When CDMA is adopted as the communication method, MS is calculated from the spreading code used for the PPP keep-alive packet.
Since the ID 102 can be identified, the field 1801 for storing the identifier of the MS 102 may not be provided.

Thereafter, the MS 102 controls the control unit 40.
2, the value of the PPP connection timer 902 for measuring the transmission cycle of the PPP keep-alive packet,
The value is set to a value smaller than the value of the state transition timer 901A that the MS 102 has in the control unit 402 (803).
The state transition timer 901A is a timer that measures a period from the time of transmission or reception of the last signal to the BSC 105 to the time when the assignment of the wireless channel to the MS 102 is released. Therefore, as a result, the state transition timer 901A performs the same measurement as the state transition timer 901B that the BSC 105 has for each MS 102.

In this case, the state transition timers 901A and 901A
FIG. 9 shows an example of the relationship between the 01B, PPP connection timer 902 and the QoS key state. When the QoS key 412 is on, the value of the PPP connection timer is set smaller than the value of the state transition timer 901A.
The time-out of 01B causes the wireless channel to be deallocated to the MS 102 and the PPP connection timer 902 times out before the MS 102 transitions from the active state 702 to the dormant state 703. The MS 102 transmits a PPP keep-alive packet when the PPP connection timer 902 times out and the state transition timer 901A does not time out. When the BSC 105 receives the PPP keep-alive packet, it sends a response packet to the MS 102.

FIG. 19 shows a configuration example of the response packet 1900. Response packet 1900 is a field 1901 storing the identifier of MS 102 that is the destination of the response packet.
And a field 1902 for storing the packet type information of the response packet. When CDMA is adopted as the communication method, the MS 102 can be identified from the spreading code used for the response packet.
The field 1901 for storing the identifier in S102 may not be provided.

The MS 102 restarts the state transition timer 901A by transmitting a PPP keep-alive packet or receiving a response packet from the BSC 105,
Since the BSC 105 restarts the state transition timer 901B by receiving a PPP keep-alive packet from the MS 102 or transmitting a response packet to the MS 102, it is possible to avoid deallocating a wireless channel.

When the user inputs the QoS key 412 again at the time when the use of the service is completed, or when the control unit 402 gives an instruction to cancel the preferential use of the wireless channel in response to the end of the use of the service, the QoS is reduced.
The key state is turned off (804). In this case, the value of the PPP connection timer 902 is set to a normal value (a timer value longer than the state transition timer 901A) (805). If there is no packet transmission / reception for a certain period, the state transition timer 901B times out before the PPP connection timer 902, the radio channel is released, and the transition to the dormant state 703 occurs. Also, when the PPP connection timer 902 times out after the transition to the dormant state, the MS 102 does not transmit the PPP keep-alive packet if the state transition timer 901A has timed out.

MS 102 transitions from a null or dormant state to an active state, or MS 1
When 02 moves between cells, it requests the BSC 105 to allocate a radio channel using a random access channel or a control channel. FIG. 17 shows a configuration example of the wireless channel assignment request packet. 1701
Is the number of the MS 102 requesting channel assignment, and 1702 is the number of the BS 104 serving the cell for which the MS is requesting channel assignment. Reference numeral 1703 denotes a BCCH in a perch channel (hereinafter, referred to as a BCCH) transmitted from the BS 104.
A transmission power value 1704 is the amount of uplink channel interference. Reference numeral 1705 denotes the received power of the BCCH measured by the MS 102, and reference numeral 1706 denotes the received SIR of the BCCH. Reference numeral 1707 denotes a required value of a downlink channel communication speed, and reference numeral 1708 denotes a required value of an uplink channel communication speed. Note that when the MS 102 moves between cells, the BSC 105 knows the service used by the moved MS 102 and the communication speed of the channel used, so that a part of the information shown in FIG. Omit everything, MS
It is also possible for the BSC 105 to automatically grasp the wireless channel allocation request accompanying the movement between the cells 102.

[0025] For example, the CD by the radio industry (ARIB)
ARI, the MA mobile phone system standard
In the BSTD-T53, the BSC uses the desired signal level (RSSI) and the interference signal level (IS
SI), the desired signal to interference signal power ratio (SIR), and the frame error rate (FER) information are periodically collected from the BS 104 and stored in the memory 502. So BSC10
Reference numeral 5 denotes a case where a wireless channel allocation request is received from the MS 102, information of the corresponding cell stored in the memory 502, a requested communication speed included in the wireless channel allocation request packet, an SIR of the BCCH, From the information such as the interference amount, the processor 503 determines how much communication quality deteriorates when a wireless channel is allocated to the allocation request MS, for example, the interference wave level when the wireless channel is allocated to the MS that has transmitted the allocation request. Prediction is made, and it is determined whether to allocate a radio channel based on whether or not the interference wave level of the prediction result satisfies a preset allowable value. In place of the interference wave level, when the BSC assigns a wireless channel to the wireless channel assignment request MS, the sum of the communication speeds of all the MSs in the active state in the BS to which the assignment has been made becomes a predetermined threshold. Whether to allocate a wireless channel may be determined based on whether or not the number is not exceeded.

A user who needs priority use of a radio channel receives a priority assignment at the time of a radio channel assignment request, and inputs a priority request in the MS 102 to continuously use the assigned radio channel. Is shown in FIG. The user enters the QoS key 412
Is input, or when the control unit 402 instructs the wireless channel preferential use request according to the service used by the user, the MS 102
A QoS request is sent to the SN 106 (1001).

FIG. 20 shows a configuration example of a QoS request packet. The QoS request packet 2000 has a field 2001 for storing an identifier of the MS 102 and a field 2002 for storing packet type information of the QoS request packet. When CDMA is adopted as the communication method, the MS 102 can be identified from the spreading code used in the QoS request packet.
The field 2001 for storing the identifier of this may not be required.

When the QoS request is received and the priority control is permitted by the reply from the PDSN 106 which has determined whether the priority control permission to the MS 102 is necessary (1002) (1).
003), turns on the QoS key state (1004), and requests the BSC 105 to allocate a radio channel (100).
5). In the case of a request to allocate a radio channel accompanying the movement of the MS 102 between cells, the BSC 105 automatically
02 may be recognized.
If the wireless channel cannot be allocated by the BSC 105, the wireless channel may be requested again after a predetermined time has elapsed. When the wireless channel is allocated by the BSC 105, as described with reference to FIG. 8, the MS 102 transmits a PPP keep-alive packet at regular intervals to maintain the PPP connection 201 (1006). Further, the value of the PPP connection timer 902 is set to a value smaller than the value of the state transition timer 901A (1007). With this setting, the MS 102 can maintain the active state 702. For example MS
When the priority control is not permitted by the PDSN 106 due to the subscription contract of 102, the display unit of the MS displays that the QoS function cannot be used (1008). In this case, the MS 102 requests the BSC 105 to allocate a wireless channel as a normal MS that is not subject to priority control (1009). If the wireless channel cannot be assigned, the wireless channel may be requested again after a certain period of time. When a wireless channel is assigned, the MS 102 cannot receive priority control, and thus does not transmit a PPP keep-alive packet.

When the user inputs the QoS key 412 again when the use of the service is completed, or when the control unit 402 issues an instruction to cancel the preferential use of the wireless channel in response to the end of the use of the service, the QoS is increased.
The key state is turned off (804). In this case, the value of the PPP connection timer 902 is set to the normal value (the state transition timer 9).
(Timer value longer than 01A) (805).

P that receives the QoS request from MS 102
FIG. 11 is a flowchart showing the process of the DSN 106. This processing is performed by the processor 61 of the management unit 601 of the PDSN 106.
Execute at 0A. After receiving the QoS request, search the MS information table 1201 corresponding to the requested MS (110
1). FIG. 12 shows a configuration example of the MS information table 1201. The MS information table is located in the memory cache 611A of the PDSN 106. MS information table 1
Reference numeral 201 denotes a mobile terminal unique identifier obtained from subscriber information, a temporary mobile terminal temporary identifier allocated after connection to the mobile network, authentication / confidential information, an IP address used by the MS, location information, and a home network. identifier,
Home Agent Address and Presence Agreement 1
It comprises contracted QoS service information 1202 such as 203 and contract transfer throughput 1204. After searching the MS information table, it is determined based on the QoS service information 1202 whether or not a priority processing contract is made (110).
2) If no priority contract is made, the MS 102 is notified that priority control cannot be provided (1106). When the priority control contract is made, the MS 102 is notified of the MS priority instruction to the BSC 105 connected thereto (11).
03), after receiving the reply (1104), notifies the MS that priority control can be provided (110).
5).

The BSC 105 is connected to the radio channel 203 assigned to the MS 102 and the link layer connection 2
A link layer connection management table 1301 for managing mapping No. 02 is provided for MS. FIG.
Is a configuration example of the link layer connection management table 1301. The link layer connection management table 1301 is arranged in the memory cache 504 of the BSC 105, and includes a link layer connection identifier, M
S IP address, resource status 1302, uplink channel code for identifying wireless channel 303, downlink channel code, packet save queue, presence / absence of priority request 130
3, uplink channel communication speed 1304, downlink channel communication speed 1305, uplink channel SIR 1306, downlink channel SIR 1307, and management pointer. B
The SC 105 further includes a channel code management table 1401 for managing the used radio channel code and realizing priority control for each cell 103 managed by the BS 104.
It has. FIG. 14 shows an example of the configuration of the channel code management table 1401. The channel code management table 1401 is located in the memory cache 504 of the BSC 105, has a priority contract, and has the layer link connection management table 1 of the MS 102 that is performing priority processing.
A priority MS management queue 1402 for registering the MS 301, a normal MS management queue 1 for registering the link layer connection management table 1301 of the MS 102 having the priority contract but not having the QoS request and the MS 102 not having the priority contract
403. Each time the MS 102 transmits or receives a signal via a wireless channel, the link layer connection management table 130 corresponding to the MS 102
1 is the management queue 1402 or 1402 by the processor 503 arranged in the management unit 501 of the BSC 105.
3 is registered again. Therefore, the management queue 140
2, 1403, the link layer connection management table 1301 of the MS 102 having the shorter elapsed time from the transmission or reception of the last signal is registered.

Here, for example, the MS 102 already in the active state sends a QoS request to the PDSN 106,
It is assumed that the PDSN 106 notifies the BSC 105 of a priority instruction to the MS 102. FIG. 15 shows the BS that has received the MS priority instruction from PDSN 106 at this time.
It is a figure showing the processing flow in C105. This process is a process executed by the processor 503 arranged in the management unit 501 of the BSC 105. The BSC 105 searches the link layer connection management table 1301 corresponding to the MS 102 that performs the priority processing (1501), and turns on the priority request 1303 of the corresponding table (150).
2). This table is used as the channel code management table 140
1 from the normal MS management queue 1403 to the top of the priority MS management queue 1402 (1503), and notifies the PDSN 106 of the end of the process for the priority instruction (150).
4).

Next, in the active state 702, the priority request MS which has already received priority processing from the BSC 105
102 moves between BSs 104 (between cells 103), or is in a null state 701 or a dormant state 70
It is assumed that the MS 102 at No. 3 transmits a QoS request, further transmits a channel assignment request, and transitions to the active state 702. FIG. 16 is a flowchart showing a control process for preferentially assigning a wireless channel to the priority request MS 102 in the BS 104. This processing is performed by the BS
The processing is executed by the processor 503 arranged in the management unit 501 of C105. When the MS 102 moves between cells (1
601) Remove the link layer connection management table 1301 of the moved MS 102 from the channel code management table 1401 corresponding to the old BS 103 (160)
2). Using the link layer connection management table shown in FIG. 13, the sum of the communication speeds of all the MSs in the active state in the new BS 103 to which the wireless channel assignment is requested is calculated for each of the uplink channel and the downlink channel, and the priority request is calculated. Based on the wireless channel assignment request packet received from the MS 102 or the communication speed of the channel used by the MS 102 prior to the movement between cells, the communication speed requested by the priority request MS 102 is assigned based on the communication speed previously recognized by the BSC 105. It is determined whether or not the threshold value is exceeded (1603). The processor 503 calculates the total communication speed and interference wave level when a wireless channel is assigned to the priority request MS 102 for each of the uplink channel and the downlink channel.
, And it may be determined whether the calculation result does not exceed the threshold value shown in FIG. If the threshold is not exceeded, the wireless channel is allocated to the MS 102 (1604), and the new BS is assigned.
Channel code management table 1401 corresponding to 102
The link layer connection management table 1301 is registered at the head of the priority MS management queue 1402 (160).
5). If the threshold value is exceeded, it is determined whether there is a link layer connection management table 1301 registered in the normal MS management queue 1403 of the channel code management table 1401 of the destination BS 103 (160).
6). If there is no link layer connection management table 1301 registered in the normal MS management queue 1403, the wireless channel cannot be allocated to the priority request MS because all the wireless channels are used by the priority MS (1612). Normal MS management queue 1403
If there is a link layer connection management table 1301 registered in the normal MS management queue 1403, all the assignment of the wireless channel to the normal MS 102 in which the link layer connection management table is registered in the normal MS management queue 1403 is released, and the wireless channel is assigned to the priority request MS. It is determined whether the total communication speed in the case of assignment does not exceed the threshold (160).
7). The assignment of the wireless channel to all the normal MSs is released, and the sum of the interference power and the communication speed when the wireless channel is assigned to the priority request MS is calculated.
It may be determined whether or not the threshold value is not exceeded.
If the total communication speed or the interference power exceeds the threshold value, the wireless channel cannot be allocated to the priority request MS (1612). Otherwise, usually M
In order from the normal MS in which the link layer connection management table 1301 is registered at the end of the S management queue 1403, the wireless communication is performed until the sum of all MS communication speeds or the interference level when the wireless channel is assigned to the priority request MS becomes equal to or less than the threshold. The channel assignment is released, and the channel is forcibly shifted to the dormant state (1608, 1609, 161).
0). The radio channel deallocated from the normal MS is allocated to the priority request MS (1611), and the link layer connection management table of the priority request MS is placed at the head of the priority MS management queue 1402 of the channel code management table corresponding to the BS to which the radio channel has been allocated. 1301 is registered (1605).

With the above configuration, when a user or an application in use requires communication quality assurance, the mobile terminal periodically transmits a priority use request packet (PPP keep-alive packet) for a wireless channel. Thereby, the timeout of the state transition timer that measures the transition timing from the active state to the dormant state can be avoided, and the priority request mobile terminal can be continuously assigned a wireless channel.
Note that the mobile terminal does not necessarily need to transmit the PPP keep-alive packet at regular intervals. If the mobile terminal periodically transmits a PPP keep-alive packet at an interval shorter than the time from when the state transition timer starts counting to when the time-out occurs, the timeout of the state transition timer can be maintained even if the transmission interval is not constant. The avoidance allows the mobile terminal to receive a continuous assignment of the radio channel.

Further, the base station controller separates the radio channel used by the priority mobile terminal using the radio channel preferentially from the radio channel used by the normal mobile terminal. It has means for managing each cell and means for managing the radio channels used by the ordinary mobile terminals in the order of the time elapsed since the last signal transmission or reception. If the priority request mobile terminal moves between cells or if the priority request mobile terminal requests radio channel allocation, and there is no available channel that can be allocated to the cell, the base station control device Of the normal mobile terminals that have been assigned a wireless channel in, forcibly deallocate the wireless channel in order from the mobile terminal with the longest elapsed time since the last signal transmission or reception, and By forcibly transiting from the active state to the dormant state and assigning the released wireless channel to the priority request mobile terminal, the priority request mobile terminal can hold the priority wireless channel even when moving between cells. When a new wireless channel assignment is requested, the wireless channel assignment can be preferentially received.

[0036]

According to the present invention, a priority request mobile terminal which needs to guarantee the communication quality of the user or the application being used can be continuously assigned a radio channel.

Further, the priority request mobile terminal can hold a priority wireless channel even when moving between cells,
Even when a new wireless channel assignment is requested, the wireless channel assignment can be preferentially received.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration example of a mobile data communication system to which the present invention is applied.

FIG. 2 is a diagram showing an example of logical connection mapping between an MS and a PDSN.

FIG. 3 is a diagram showing an example of a threshold value when a wireless channel is assigned to an MS.

FIG. 4 is a diagram showing a configuration example of an MS.

FIG. 5 is a diagram showing a configuration example of a BSC.

FIG. 6 is a diagram showing a configuration example of a PDSN.

FIG. 7 is a transition diagram showing resource states in packet switching.

FIG. 8 is a flowchart showing one processing procedure of an MS for holding a wireless channel.

FIG. 9 is a diagram showing an example of a relationship between a state transition timer, a PPP keep-alive timer, and a QoS key state.

FIG. 10 is a flowchart showing one processing procedure of an MS for receiving a priority assignment of a wireless channel and continuously using the wireless channel.

FIG. 11 is a flowchart showing one processing procedure of a PDSN that has received a QoS request.

FIG. 12 is a configuration example of an MS information table arranged in a PDSN memory cache;

FIG. 13 is a configuration example of a link layer connection management table arranged in a memory cache of a BSC.

FIG. 14 is a configuration example of a channel code management table arranged in a memory cache of a BSC.

FIG. 15 is a flowchart showing one processing procedure of a BSC that has received a priority instruction.

FIG. 16 is a flowchart showing a wireless channel assignment processing procedure in the BSC when a priority requesting MS requests wireless channel assignment;

FIG. 17 is a configuration example of a wireless channel assignment request packet.

FIG. 18 is a configuration example of a PPP keep-alive packet.

FIG. 19 is a configuration example of a response packet to a PPP keep-alive packet.

FIG. 20 is a configuration example of a QoS request packet.

[Explanation of symbols]

101: Mobile data communication system 102: Mobile terminal (MS) 103: Cell 104: Base station (BS) 105: Base station controller (BSC) 106: Packet data Service node (PDS
N) 107 ... router 108 ... home agent (HA) 109 ... packet core network 110 ... radio access network (RAN) 201 ... PPP connection 202 ... link layer connection 203 ... Wireless channel 300 ... Interference level threshold table 401 ... User I / F section 402 ... Control section 403 ... Transmission / reception processing section 404 ... Antenna 405 ... RAM 406 ... ROM 407 ... Display unit 408 Power switch 409 Dial key 410 Select key 411 Scroll key 412 QoS key 413 Speaker 414 Microphone 415 Battery 416 ..Switch part 417 ・ ・ ・ Bus 418 ・ ・ ・PU 501: Management unit 502: Memory 503: Processor 504: Memory cache 505: Buffer memory 506: Buffer memory controller 507: Hard disk 508: Hard disk controller 509 ...・ Packet bus 510 ・ ・ ・ Base station I / F port 511 ・ ・ ・ Network I / F 601 ・ ・ ・ Management unit 602 ・ ・ ・ Routing unit 603 ・ ・ ・ Packet bus 605 ・ ・ ・ Memory 606 ・ ・ ・Buffer memory 607 Buffer memory controller 608 Hard disk 609 Hard disk controller 610 Processor 611 Memory cache 612 Port controller 701 Null state 702 Active state 703 Dormant state 901 State transition timer 902 PPP keep-alive timer 1201 MS information table 1202 QoS information 1301 Link layer connection management table 1302 Resource state 1303 Priority request 1401 ... Channel code management table 1402 ... Priority MS management queue 1403 ... Normal MS management queue 1700 ... Wireless channel assignment request packet

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Susumu Matsui 1099 Ozenji Temple, Aso-ku, Kawasaki City, Kanagawa Prefecture Inside System Development Laboratory, Hitachi, Ltd. F term in Hitachi, Ltd. System Development Laboratory (reference) 5K033 CB17 CC01 DA01 DA03 DA06 DA19 DB18 DB21 5K067 AA21 BB21 CC08 DD51 EE02 EE10 EE16 JJ17

Claims (26)

[Claims] 1. A communication terminal for communicating with a control station, comprising: a control unit; a transmission / reception processing unit; and a communication path connecting the control unit and the transmission / reception processing unit. A communication terminal for performing control to periodically transmit a priority request to the control station via the transmission / reception processing unit when performing continuous communication with the control station. 2. A mobile terminal communicating with a radio base station, comprising: a control unit; a transmission / reception processing unit; and a communication path connecting the control unit and the transmission / reception processing unit. A mobile terminal, wherein when performing continuous communication with the radio base station, the mobile terminal performs control to periodically transmit a priority request to the radio base station via the transmission / reception processing unit. 3. The mobile terminal according to claim 2, further comprising: a first timer that starts counting in response to transmission or reception of a signal, wherein the control unit responds to a timeout of the first timer. Transmitting the priority request to the radio base station and restarting the first timer. 4. The mobile terminal according to claim 3, wherein the control unit sets a timeout value of the first timer to a signal between the mobile terminal and the wireless base station when the wireless channel is used preferentially. The mobile terminal sets a value smaller than a channel holding time, which is a time from the transmission or reception of the wireless base station to the wireless base station releasing the wireless channel allocation. 5. The mobile terminal according to claim 4, further comprising a second timer for counting the channel holding time, wherein the control unit is configured to, when not preferentially using the radio channel, perform the second timer. A mobile terminal, wherein a timeout value of one timer is set to a value larger than the channel holding time, and control is performed so as not to transmit the priority request when the second timer has timed out. 6. A mobile terminal that communicates with a radio base station, comprising: a control unit; a transmission / reception processing unit; and a communication path connecting the control unit and the transmission / reception processing unit. A mobile terminal, wherein when requesting the wireless base station to allocate a wireless channel, the mobile terminal controls transmission of the wireless channel preferential allocation request via the transmission / reception processing unit. 7. A base station controller for controlling a base station communicating with a mobile terminal, comprising: a base station interface unit for connecting to the base station; a management unit; the base station interface unit and the management unit A state transition timer that starts counting from transmission or reception of a signal between the mobile terminal and the base station, and counts time until the wireless channel is deallocated to the mobile terminal. The management unit, from the mobile terminal via the base station,
A base station control device, wherein upon receiving a priority request for performing continuous communication with the base station, the state transition timer is restarted. 8. The base station control apparatus according to claim 7, wherein the management unit controls to transmit a response to the mobile terminal when receiving the priority request. . 9. A base station controller for controlling a base station communicating with a mobile terminal, comprising: a base station interface unit for connecting to the base station; a management unit; the base station interface unit and the management unit And a communication path for connecting a priority channel to the priority request mobile terminal transmitting a priority request for requesting preferential use of the wireless channel. A base station control apparatus that controls to preferentially allocate a radio channel to the priority request mobile terminal. 10. The base station control device according to claim 9, wherein the request for allocating the radio channel is generated when the priority request mobile terminal moves to a control area of the base station. The base station control device, wherein the base station control device is an allocation request. 11. The base station control device according to claim 9, wherein the management unit transmits a priority request when a radio channel is insufficient in a base station that allocates a radio channel to the priority request mobile terminal. A base station control apparatus, which deallocates a wireless channel to a non-priority request mobile terminal that has not been assigned, and controls to allocate the radio channel to the priority request mobile terminal. 12. The base station control apparatus according to claim 11, wherein the management unit transmits or receives a signal to or from a base station among mobile terminals to which a radio channel is assigned from the base station. A base station control apparatus, which performs control so as to release radio channel assignment in order from a non-priority request terminal having a longer elapsed time from the terminal. 13. A packet data service node for connecting a base station control device to an external network, comprising: a management unit; a routing unit for connecting to the base station control device or the external network; Having a communication path connecting the routing unit, the management unit, via the base station controller, received a priority request from a mobile terminal communicating with a base station controlled by the base station controller In this case, the packet data service node controls transmission of a priority processing permission response for causing the mobile terminal to preferentially use a wireless channel to the base station controller. 14. The packet data service node according to claim 13, further comprising: a mobile terminal information table for registering whether or not the mobile terminal has a priority processing contract. A packet data service node for controlling transmission of a priority processing permission response to the mobile terminal when a priority processing contract of the mobile terminal is registered. 15. A method for wireless communication between a mobile terminal and a wireless base station, the method comprising: determining a timeout value of a first timer by transmitting a signal between the mobile terminal and the wireless base station; A step of setting a value smaller than a timeout value of a second timer for measuring a time from the time of reception to the time when the radio channel allocated to the mobile terminal is released; and Transmitting a priority request requesting continuous use of a radio channel to the radio base station in response to the timeout; resetting the first timer and the second timer in response to the transmission of the priority request; Starting the mobile terminal, the mobile terminal periodically transmits the priority request in response to the timeout of the first timer, and the radio channel assigned to the mobile terminal. Wireless communication method, characterized in that 16. A method for wireless communication between a mobile terminal and a base station controlled by a base station controller, wherein the base station controller requests continuous use of a radio channel. Receiving the priority request from the mobile terminal via the base station; and, in response to receiving the priority request, transmitting or receiving a signal between the mobile terminal and the base station to the mobile terminal. Restarting a state transition timer that measures the time until the allocated wireless channel is released, and maintaining the allocation of the wireless channel to the mobile terminal in response to receiving the priority request. Wireless communication method characterized by performing control. 17. A method for wireless communication between a mobile terminal and a base station controlled by a base station controller, wherein the base station controller has a priority on a radio channel for the mobile terminal. Receiving a priority assignment request for requesting assignment, and, if the number of radio channels assigned to the mobile terminal is insufficient, controlling to release a radio channel assigned to another mobile terminal; Controlling to allocate the released wireless channel to the mobile terminal, and controlling to allocate the wireless channel to the mobile terminal preferentially in response to receiving the priority allocation request. Radio channel allocation method. 18. The wireless channel allocating method according to claim 17, wherein the step of controlling to release the wireless channel comprises:
Among the mobile terminals to which a radio channel is allocated from a base station that allocates a radio channel to the mobile terminal, the radio channel is allocated in order from a mobile terminal having a longer elapsed time since transmission or reception of a signal with the base station. A method for allocating a wireless channel, comprising a step of controlling to be released. 19. A computer-readable recording medium in which a program for requesting a mobile terminal to preferentially use a wireless channel with a wireless base station is recorded, wherein a time-out value of a first timer is set. A value smaller than the timeout value of the second timer that measures the time from when a signal is transmitted or received between the mobile terminal and the wireless base station until the wireless channel allocated to the mobile terminal is released. Setting, and transmitting a priority request requesting continuous use of a radio channel to the radio base station in response to the timeout of the first timer; and transmitting the priority request in response to the transmission of the priority request. Causing the mobile terminal to execute a first timer and a step of restarting the second timer, wherein the mobile terminal is assigned to the mobile terminal. And a computer-readable recording medium on which a program for requesting to hold a wireless channel is recorded. 20. A computer-readable recording medium in which a program for causing a base station controller to execute a priority process for a mobile terminal communicating with a base station controlled by the base station controller is recorded. Receiving a priority request from the mobile terminal via the base station for requesting continuous use of a signal between the mobile terminal and the base station in response to receiving the priority request. Restarting a state transition timer that measures the time from the transmission or reception of the radio terminal to the release of the radio channel allocated to the mobile terminal. In response to receiving the above priority request,
A computer-readable recording medium storing a program for controlling the mobile terminal to maintain the assignment of the wireless channel. 21. A computer-readable recording medium in which a program for causing a base station controller to execute radio channel assignment control for a mobile terminal communicating with a base station controlled by the base station controller is recorded. Receiving a priority assignment request for requesting preferential assignment of a radio channel for the mobile terminal; and when the number of radio channels to be assigned to the mobile terminal is insufficient, the radio channel is assigned to another mobile terminal. Controlling the base station controller to release the existing radio channel, and controlling the mobile station to allocate the released radio channel to the mobile terminal. A program for controlling the mobile terminal to preferentially allocate a radio channel in response to the reception of A computer-readable recording medium that records a ram. 22. The computer-readable recording medium according to claim 21, wherein the step of controlling to open the wireless channel comprises:
Among the mobile terminals to which a radio channel has been allocated from a base station that allocates a radio channel to the mobile terminal, the radio channels are released in order from the mobile terminal having a longer elapsed time since transmission or reception of a signal with the base station. A computer-readable recording medium having a step of controlling 23. A base station, comprising: a base station controller that controls the base station; and a mobile terminal that communicates with the base station by using a radio channel. A mobile communication system which controls to release a radio channel allocated to a mobile terminal whose elapsed time from transmission or reception of a signal during a period of time exceeds a predetermined time, comprising: The mobile terminal that requests the mobile station transmits a priority request to the base station, and the base station control device that has received the priority request via the base station controls the mobile terminal to continue allocating a radio channel to the mobile terminal. A mobile communication system characterized by the above-mentioned. 24. The mobile communication system according to claim 23, wherein said mobile terminal periodically transmits said priority request, and said base station control device sends a response to said received priority request to said mobile terminal. A mobile communication system, comprising: transmitting and controlling the elapsed time of the mobile terminal not to exceed the fixed time. 25. A mobile communication system comprising: a base station; a base station control device that controls the base station; and a mobile terminal that communicates with the base station by using a wireless channel. When the number of channels is insufficient, the base station control apparatus is a mobile terminal to which a radio channel has been allocated from the base station, the mobile terminal having a long elapsed time from transmission or reception of a signal with the base station. A mobile communication system characterized by performing control so as to release the assignment of a wireless channel in order from. 26. The mobile communication system according to claim 25, wherein said base station control apparatus allocates a radio channel to a mobile terminal transmitting a priority request for requesting a preferential use of a radio channel. Receiving the request, when the base station has a shortage of radio channels, deallocating the radio channels in order from the mobile terminal having the longer elapsed time, and controlling the radio channel to be allocated to the mobile terminal. Characteristic mobile communication system.