JPH0823350A - Wireless packet channel setting method - Google Patents

Abstract

(57) [Summary] [Object] To provide a wireless packet channel setting method capable of preventing invalid consumption of channel resources when a packet has low traffic and enabling effective allocation of channel resources to circuit-switched communication. [Configuration] A packet multiplex communication between a base station and a plurality of mobile stations at the time when a packet to be transmitted occurs at an arbitrary base station or mobile station, or at a time specified by a procedure predetermined by the base station. To set the channel for packet switching to hold the packet switching channel for the window setting time, and to exchange packets from multiple mobile stations that occurred during the window setting time for the same packet switching. Packet multiplex communication on the communication channel.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for setting a wireless packet channel in a wireless communication system.

[0002]

2. Description of the Related Art First Prior Art (Channel Separation Setting Method) INS-P which is a packet communication system provided by N-ISDN, and LAN which communicates both voice and data
A channel separation setting method is known as a method for setting a packet exchange channel (a channel for performing packet multiplex communication between a plurality of stations) adopted in the IVD-LAN. In this method, the communication channel is divided into a voice signal channel and a packet (data) signal channel. During packet switching communication, a packet switching channel is used regardless of the presence or absence of transmission packets. Is set.

Generally, in a wireless communication system, effective use of limited channel resources is a big problem. Packet communication is a method of multiplex transmission of multiple communications on the same communication channel by transmitting data packets that occur intermittently, but when traffic is low, the average occurrence interval of packets increases, The unused time of the channel increases and the utilization efficiency of the channel decreases.

Therefore, in a wireless communication system in which circuit switching communication and packet switching communication coexist, when the above-mentioned first conventional technique is adopted, a certain channel resource is provided regardless of the traffic of the packet actually transmitted. It is consumed and it becomes impossible to allocate the unused channel resource of the exchange channel to the circuit switched communication.

Second prior art (packet unit channel setting
(Constant method) As another conventional technique, a packet unit channel setting method is known. In this method, the packet switching channel is set at each time when a packet is generated, and the packet switching channel is released at each time when the transmission of this packet is completed.

However, according to the second conventional technique, since the packet switching channel is set up and released every time a packet is transmitted, the processing associated with the channel setup and the channel release is extremely necessary when the packet traffic is high. There is a problem in that the load on the system becomes large.

Third conventional technology (CelluPLANII method)
Formula) In a cellular system based on the FCA (Fixed Channel Assignment) method, channels (circuit switching channels) and packets for performing communication (circuit switching communication) based on a circuit switching mode from a plurality of communication channels allocated to a cell. Cel is one technique for allocating a replacement channel.
The luPLANII system is known.

FIG. 11 is a time chart for setting a channel for packet switching in the CelluPLANII system. In the figure, 111 is a channel for channel switching, and 11
2 indicates a packet switching channel, and 113 indicates a packet. As is clear from this figure, according to this conventional method, the channel switching channel is set when the circuit switched call is generated and released when the circuit switched call is terminated. On the other hand, the packet switching channel is logically always secured continuously, but it is secured while hopping between empty channels for the purpose of not affecting the channel setting of the circuit switching channel. Therefore, channel setting and release due to hopping are required.

In the third conventional technique, the packet switching channel is always secured while hopping,
As in the case of the above-described first conventional technique, a certain amount of channel resources are consumed regardless of the traffic of packets actually transmitted, and it is not possible to allocate unused channel resources of exchange channels to circuit-switched communication. The problem of being possible arises.

Further, since the third conventional technique requires hopping, it is applicable only to the FCA type cellular system, and in the PHS (personal handyphone system) etc. adopting DCA (dynamic channel assignment). , It is necessary to reconfigure the channel for packet switching at the time of hopping. Therefore, there is also a problem that the system load and the delay time associated with the selection and the resetting process of the free communication channel of the hopping destination increase.

Therefore, the present invention solves the above-mentioned problems of the prior art, the purpose of which is to prevent the unnecessary consumption of channel resources when a packet has low traffic and to effectively utilize the channel resources for circuit-switched communication. It is to provide a wireless packet channel setting method that can be assigned.

Another object of the present invention is to provide a wireless packet channel setting method capable of preventing an increase in the number of processes involved in channel setting when a packet has high traffic.

Still another object of the present invention is to provide a wireless packet channel setting method which does not require resetting of a packet switching channel by hopping.

[0014]

According to the present invention, a plurality of mobile stations belong to a radio zone formed by a base station, and an arbitrary communication channel among a plurality of communication channels assigned in advance is selected. The present invention relates to a wireless packet channel setting method in a mobile wireless communication system that is assigned to communication performed between a base station and a mobile station. According to the present invention, at the time when a packet to be transmitted occurs in any base station or mobile station, or at a time specified by a procedure predetermined by the base station, between the base station and a plurality of mobile stations. Set the packet switching channel for packet multiplex communication, hold this packet switching channel for the window setting time, and use the same packets from multiple mobile stations generated during the window setting time. Packet multiplex communication is performed on the packet switching channel. The packet switching channel is released after the window setting time described above has elapsed.

The window setting time is a variable period according to the traffic, and is preferably a period defined by comparing the continuous packet non-transmission time with a fixed or variable window holding time.

According to the above-described channel setting method of the present invention, the base station and the plurality of mobile stations communicating with the base station are provided, and the base station and the mobile stations under the control of the base station are connected to each other. In a mobile radio communication system that performs circuit-switched communication and packet-switched communication, a base station is generated when a packet to be transmitted is generated in an arbitrary base station or mobile station, or when a base station specifies a packet according to a predetermined procedure. Since a packet switching channel for performing packet multiplex communication between the mobile station and a plurality of mobile stations is set, it is possible to set a channel for a packet call according to the traffic volume. As a result, it is possible to effectively prevent the invalid consumption of channel resources when the packet call has low traffic, which has been a problem in the conventional channel separation setting method.
Allows effective allocation of channel resources to circuit switched communications.

The packet switching channel is held for the window setting time, and packets from a plurality of mobile stations generated during the window setting time are packet-multiplexed on the same packet switching channel. Therefore, if a packet originates from the same mobile station while this window is secured even after the end of packet transmission, the packet can be transmitted within this window without making a new request. . Therefore, it is possible to effectively prevent an increase in the number of processes associated with the channel setting when the packet has high traffic, which has been a problem in the conventional packet unit channel setting method.

Furthermore, according to the present invention, a cellular system using dynamic channel assignment, which is not applicable in the conventional CelluPLANII system, is also provided according to the present invention.
When the packet has high traffic, the packet switching channel is maintained without hopping, so it is not necessary to reconfigure the packet switching channel by hopping. It is possible to prevent an increase in delay time. In addition, since it is possible to set the channel according to the traffic volume for packet calls, it is possible to prevent the invalid consumption of channel resources when the packet has low traffic, and to promote the reuse of channels in adjacent cells. It is possible to further improve the channel utilization efficiency.

[0019]

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a diagram showing the concept of a mobile radio communication system to which the channel setting method of the present invention is applied, as an embodiment of the present invention.

As shown in the figure, this mobile radio communication system is composed of a plurality of cells 10.
Within the network, one base station 11 performs circuit switching communication with a circuit switching terminal 12 and packet terminal 13 performs packet switching communication.
And a shared terminal 14 that performs both circuit-switched communication and packet-switched communication.

A plurality of communication channels that can be used by the mobile radio communication system are shared between cells and are assigned to each cell by dynamic channel assignment. Here, the base station 11 constantly monitors signals from other cells, autonomously searches and determines an empty communication channel based on the presence or absence of signal reception, and the mobile station 1 under the control of this base station 11
Assign for communication with 2, 13 or 14.

From the base station 11 to the mobile station 12, 13 or 14
If the transmission packet to the base station 11 is a downlink packet and the transmission packet from the mobile station 12, 13 or 14 to the base station 11 is an uplink packet, the base station 11 determines whether there is a downlink packet and the uplink packet from the mobile station 12, 13 or 14. In response to a packet channel allocation request accompanying transmission, channel setting and allocation of packet switching channels are performed. By continuously transmitting downlink signals, the base station 11 indicates to other base stations that the communication channel is in use, and maintains the packet switching channel under the dynamic channel assignment described above.

The base station 11 also determines whether or not a circuit-switched call is received by the mobile station 12, 13 or 14 and the mobile station 12, 1 or
In response to a circuit switching call request from 3 or 14, the circuit switching channel is set and assigned. The mobile station 1
A packet channel allocation request and a circuit switching call originating request from 2, 13 or 14 to the base station 11 and channel allocation information notification from the base station 11 to the mobile station 12, 13 or 14 are performed by the base station 11 and this base station. The mobile station 12, 13 or 14 which is transmitted using the common control channel CCH (FIG. 2 and FIG. 3) set with the plurality of mobile stations 12, 13 or 14 under the control of 11 is in the standby time, The common control channel CCH is received.

Further, the base station 11 has a timer (hereinafter referred to as a window timer) for measuring the continuous non-transmission time of packets.

FIG. 2 is a flow chart showing a control sequence for upstream packet transmission in the embodiment of FIG.

As shown in the figure, the terminal 12, 13 or 14 not assigned with the packet switching channel PCH.
Prior to the transmission of the uplink packet, the common control channel C
The packet channel allocation request signal 21 is transmitted to the base station 11 using CH.

Upon receiving the packet channel allocation request signal 21, the base station 11 first stops the operating window timer and initializes it if a packet exchange channel has already been set up with another mobile station. Then, the existing packet switching channel is notified to the mobile station 12, 13 or 14 and channel allocation is performed. If there is no existing packet switching channel, a communication channel for which a packet switching channel is newly set is selected from the idle communication channels, and the channel is allocated to the mobile station 12, 13 or 14 and the allocated channel is selected. To start continuous transmission of downlink signals. The packet channel allocation information is notified to the mobile station 12, 13 or 14 by the packet allocation signal 22 on the common control channel CCH.

The mobile station 12, 13 or 14 that has received the channel assignment is assigned the packet switching channel P.
The upstream packet signal 23 is transmitted using CH. The base station 11 that has completed the reception of the upstream packet signal starts the window timer. After that, the mobile station 12, 13 or 14
Transmits an uplink packet signal using this channel until the allocated packet switching channel PCH is released.

FIG. 3 is a flow chart showing the control sequence of downlink packet transmission in the embodiment of FIG.

As shown in the figure, the base station 11 first stops and initializes the operating window timer when a packet exchange channel has already been set up with another mobile station. The existing packet switching channel is notified to the destination mobile station 12, 13 or 14 and channel allocation is performed. If there is no existing packet switching channel, a communication channel for newly setting a packet switching channel is selected from among the empty communication channels, and the destination mobile station 12,
Assignment is made to 13 or 14, and continuous transmission of downlink signals using the assigned channel is started. Here, the packet channel allocation information is the common control channel CC.
The packet channel assignment signal 31 on H informs the mobile station 12, 13 or 14.

After the channel assignment is completed, the base station 11 transmits the downlink packet signal 32 using the assigned packet switching channel PCH. The base station 11 that has completed the transmission of the downlink packet signal starts the window timer. After that, the base station 11 transmits downlink packet signals using the allocated packet switching channel PCH until the allocated channel PCH is released.

FIG. 4 is a flow chart showing a control sequence for releasing a packet switching channel in the embodiment of FIG.

When the window timer described above has passed a predetermined time (window hold time), the base station 11 determines that the time during which packets are not continuously transmitted has passed the window hold time, and All mobile stations 1 that have been assigned a switching channel PCH
Packet channel release signal 4 for 2, 13 or 14
1 is used to notify the release of the packet switching channel PCH, and the continuous transmission of downlink signals is stopped. The mobile station 12, 13 or 14 that has received the packet channel release signal transits to the standby time state.

FIG. 5 is a timing chart of packet switching channel setting and packet multiplex communication on this packet switching channel in the case of performing upstream packet transmission in the embodiment of FIG.

As shown in the figure, when the mobile station A that has not been assigned the packet switching channel transmits a packet, the mobile station A uses the uplink control channel to request the packet channel assignment request signal 51 (request A). ) To the base station. Upon receiving the packet channel allocation request signal (request A), the base station sets the packet switching channel 58 and uses the downlink common control channel to transmit the packet allocation signal 5
2 (allocation A) is transmitted to the mobile station A, and continuous transmission of downlink signals is started. The packet exchange channel 58 is a variable period defined according to traffic, and is a period defined by comparing the value of the window timer (time when packets are not continuously transmitted) and the window hold time. It is held for a set time.

The mobile station A uses the assigned packet switching channel 58 based on the information of the packet channel assignment signal (assignment A) from the base station to transmit the packet signal 53.
(Packet A) is transmitted. Subsequently, the mobile station B transmits a packet channel assignment request signal 54 (request B),
The base station allocates the already set packet switching channel 58 by using the packet channel allocation signal 55 (allocation B). Thereafter, the mobile station A and the mobile station B transmit the packet signal 53 (packet A) and the packet signal 56 (packet B) using the assigned common packet switching channel.

When the window timer exceeds the window hold time described above, the base station transmits a packet channel release signal 57 in a broadcast format to notify mobile stations A and B of channel release. At the same time, the transmission of downlink signals is stopped.

When mobile station B transmits a packet again, packet signal 56 (packet B) is received after the packet switching channel is allocated according to the procedure described above.
Send

The window holding time described above may be constantly operated at a constant value, or may be varied according to the traffic.

FIG. 6 is a timing chart of circuit switching channel and packet switching channel setting when the channel setting method of the present invention described in the above embodiment is applied to a wireless communication system in which circuit switching communication and packet switching communication coexist. FIG. 7 is a timing chart of circuit switching channel and packet switching channel setting when the first conventional technique (channel separation setting method) is applied.

In these figures, 62 and 72 are packet switching channels, 61 and 71 are packets on the packet switching channels 62 and 72, and 63 and 73 are circuit switching channels. As is clear from the comparison between FIG. 6 and FIG. 7, according to the conventional channel separation setting method, the minimum number of communication channels required to prevent a call loss of a circuit-switched call is three. According to the method, the packet switching channel 62 can be set according to the traffic of the packet 61, so that the minimum number of communication channels is two. This shows that the channel setting method of the present invention is very effective in improving the channel utilization efficiency.

FIG. 8 is a diagram showing how packet-switching channel setting processing and release processing occur when the channel setting method of the present invention is applied to a wireless communication system.
FIG. 9 is a diagram showing how packet assignment channel allocation processing and packet release processing occur when the second conventional technique (packet-based channel setting method) is applied.

In these figures, 81 and 91 are packets, and 82 is a packet switching channel. As is clear from a comparison between FIG. 8 and FIG. 9, according to the conventional packet unit channel setting method, packet channel setting processing and release processing are concentrated at the time of high traffic of a packet call. However, according to the channel setting method of the present invention, the concentration of packet channel setting processing and packet release processing is suppressed.

FIG. 10 is a timing chart of packet switching channel setting when the channel setting method of the present invention is applied to a cellular system using dynamic channel assignment. In the figure, 101 is a packet switching channel of the cell of interest, 102 is a packet switching channel of an adjacent cell, and 103 is a packet. As is clear from this figure, window control within each cell allows the channel for packet switching to be set according to the traffic of the packet, thus facilitating the reuse of the channel in the adjacent cell and further increasing the channel utilization. It is possible to improve efficiency.

The embodiments described above are merely illustrative of the present invention and not restrictive, and the present invention can be implemented in various other modifications and alterations. Therefore, the scope of the present invention is defined only by the claims and their equivalents.

[0047]

As described in detail above, according to the present invention,
To perform packet multiplex communication between a base station and multiple mobile stations at the time when a packet to be transmitted occurs at any base station or mobile station, or at the time specified by a procedure that is predetermined by the base station. The packet switching channel is set up. Therefore, it is possible to set the channel for the packet call according to the traffic volume. As a result, it is possible to effectively prevent the invalid consumption of channel resources when a packet call has low traffic, which has been a problem in the conventional channel separation setting method, and it is possible to effectively allocate the channel resources to the circuit switched communication. It will be possible.

Further, according to the present invention, this packet switching channel is held for the window setting time, and packets from a plurality of mobile stations generated during the window setting time are packetized on the same packet switching channel. Multiplex communication. Therefore, even after the packet transmission is completed, if a packet originates from the same mobile station while this window is secured, the packet can be transmitted within this window without making a new request. Therefore, it is possible to effectively prevent an increase in the number of processes associated with the channel setting when the packet has high traffic, which has been a problem in the conventional packet unit channel setting method.

Furthermore, according to the present invention, even in a cellular system using dynamic channel assignment, which is not applicable in the conventional CelluPLANII system,
When the packet has high traffic, the packet switching channel is maintained without hopping, so it is not necessary to reconfigure the packet switching channel by hopping. It is possible to prevent an increase in delay time. In addition, since it is possible to set the channel according to the traffic volume for packet calls, it is possible to prevent the invalid consumption of channel resources when the packet has low traffic, and to promote the reuse of channels in adjacent cells. It is possible to further improve the channel utilization efficiency.

[Brief description of drawings]

FIG. 1 is a diagram showing a concept of a mobile radio communication system to which a channel setting method according to the present invention is applied, as an embodiment of the present invention.

2 is a flowchart showing a control sequence for upstream packet transmission in the embodiment of FIG.

3 is a flowchart showing a control sequence of downlink packet transmission in the embodiment of FIG.

FIG. 4 is a flowchart showing a control sequence for releasing a channel for exchange in the embodiment of FIG.

5 is a timing chart of packet switching channel setting and packet multiplex communication on the packet switching channel in the case of performing upstream packet transmission in the embodiment of FIG. 1. FIG.

FIG. 6 is a timing chart for setting a circuit switching channel and a packet switching channel in the channel setting method of the present invention.

FIG. 7 is a timing chart of circuit switching channel and packet switching channel setting in the first conventional technique (channel separation setting method).

FIG. 8 is a diagram showing how packet exchange channel setting processing and release processing occur in the channel setting method of the present invention.

FIG. 9 is a diagram showing how packet exchange channel setting processing and release processing occur in the second conventional technique (packet-based channel setting method).

FIG. 10 is a timing chart of packet switching channel setting when the channel setting method of the present invention is applied to a cellular system using dynamic channel assignment.

FIG. 11 is a timing chart of packet switching channel setting in the third conventional technique (CelluPLANII system).

[Explanation of symbols]

10 cell 11 base station 12 circuit switching terminal 13 packet terminal 14 shared terminal 21 packet channel allocation request signal 22, 31 packet channel allocation signal 23, 32, 61, 71, 81, 91, 113 packet signal 41, 57 packet channel release signal 51 packet channel allocation request signal from mobile station A 52 packet channel allocation signal to mobile station A 53 packet signal from mobile station A 54 packet channel allocation request signal from mobile station B 55 packet channel allocation signal to mobile station B 56 Packet signal from mobile station B 58, 62, 72, 82, 112 Packet switching channel 63, 73, 111 Circuit switching channel 101 Packet switching channel used in target cell 102 Packet signal transmitted in target cell 103 Adjacent Used in cell Packet signals transmitted packet exchange channel 104 adjacent cells

─────────────────────────────────────────────────── ───Continued from the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical indication H04Q 7/34 H04B 7/26 109 N H04Q 7/04 C

Claims (3)

[Claims] 1. A plurality of mobile stations belong to a radio zone formed by a base station, and an arbitrary communication channel among a plurality of pre-allocated communication channels is set between the base station and the mobile station. A method for setting a wireless packet channel in a mobile wireless communication system, which is assigned to a communication performed by a mobile station, which is specified at a time when a packet to be transmitted occurs in an arbitrary base station or mobile station, or by a predetermined procedure in the base station. At that time, a packet switching channel for performing packet multiplex communication between the base station and the plurality of mobile stations is set, and the packet switching channel is held for a window setting time, The packets from the plurality of mobile stations generated during the window setting time are packet-multiplexed on the same packet switching channel. Wireless packet channel setting method characterized by. 2. The method according to claim 1, wherein the window setting time is a variable period defined according to traffic. 3. The method according to claim 1, wherein the window setting time is a period defined by a comparison between a packet non-transmission time and a window holding time.