JP2806655B2 - Traffic distribution method in mobile communication system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a traffic distribution system in a mobile communication system.

[0002]

2. Description of the Related Art EIA (ELECTRONIC INDU) which is a specification of a cellular mobile radio communication system.
STRIES ASSOCIATION) IS-3-
D or TACS (TOTAL ACCESS C
OMMUNICATIONS SYSTEM) Issu
In the conventional cellular mobile telephone systems of e-4 system, the mobile telephone terminal after power-on scanning a channel range on the control channel defined Me beforehand, the measurement of the carrier reception level of the downlink control channel Then, a downlink control channel received at the strongest received electric field carrier level is selected and tuned. FIG. 3 is a diagram showing an example of each service area of a plurality of radio base stations constituting the cellular mobile telephone system, and FIGS. 4 (A) and 4 (B).
Is a diagram showing a call processing sequence of the normal call processing sequence, no idle traffic channel to be the traffic channel assignment for the call request from the respective mobile telephone terminal.

In FIG. 3, a mobile telephone terminal is located in a service area a of a radio base station 20, and a radio base station 2
After tuning to the downlink control channel being broadcast from 0,
Overlap areas b, c, d, e, f, g with service areas of other radio base stations 21, 22, 23, 24, 25, 26
In this case, the mobile telephone terminal keeps the state tuned to the downlink control channel of the radio base station 20 as long as it can receive the downlink control channel signal broadcast from the radio base station 20 once selected.

[0004] When the above-mentioned mobile telephone terminal performs a calling operation or an incoming call response operation, if there is a free communication channel to the communication channel held in the radio base station 20, FIG. 4
Although mobile phone terminals as shown in (A) is Ru 1 channel can real Hodokosuru the assigned call services <br/> free speech channel in traffic channel held by the radio base station 20, the free Figure 4 if no call channel exists
As shown in (B), the radio base station 20 directs the mobile phone terminal to the Directed Ret on the downlink control channel.
ry signal, so that the mobile telephone terminal can tune to the radio base station 21 other than the radio base station 20.
After tuning and re-select one of the downlink control channel for broadcasting of 3,24,25 and 26, by responding call-incoming call on the uplink control channel of the re-selected radio base station, re The communication channel possessed by the selected wireless base station is allocated to realize the communication service.

[0005]

In FIG. 3, assuming that the traffic volume in the service area a of the radio base station 20 is very large and there is no free communication channel,
In the conventional method, the mobile telephone terminal selecting the downlink control channel broadcast from the radio base station 20 is connected to the service area of the radio base station 20 and the other radio base stations 21, 22 and 22.
When located in overlapping areas b, c, d, e, f, and g of the service areas 23, 24, 25, and 26, the downlink control channels of other radio base stations are in a selectable state. In other words, it continues to tune to the downlink control channel of the radio base station 20, and the traffic load is further applied to the radio base station 20 in which the call service is disabled.

The call connection procedure in the above state is shown in FIG.
As shown in (B), once a call to the radio base station 20 or an incoming call response is transmitted from the mobile telephone terminal to the uplink control channel of the radio base station 20, thereafter, the communication channel is not allocated, and The Retry signal is transmitted to the mobile telephone terminal on the downlink control channel of the radio base station 20, and based on the Directed Retry signal, the mobile telephone terminal transmits the radio base station 21, 22, 23, 2
After transmitting the Izu <br/> Re or reselection to recalling and re call response of the downlink control channel for broadcasting of 4, 25 and 26, speech channel held by the reselected base station assignment It is in realizes the call, increasing the invalid processing in the radio base station and mobile telephone exchange, not only compresses the processing power, the question of a call connection time becomes long
There was a title .

[0007]

According to the present invention , a downlink control channel and an uplink control channel for transmitting a control signal between a radio base station and a mobile telephone terminal are provided as a pair of control channels; a traffic distribution scheme in a mobile communication system carrying a plurality of speech channels at the one station radio base station, the radio base station traffic distribution starts from traffic and calls the number of channels that are expected by the own station leave the threshold and traffic distribution stop threshold value and the channel selection re-implement instructions transmission cycle determined Me beforehand, the speech channel the ratio of the number of speech channels in use in the call and the total number of speech channels held Calculated as a usage rate, and when the calculated traffic channel usage rate is equal to or greater than the traffic distribution activation threshold value, Channel with a periodicity based on the channel selection again fulfilled instruction transmitting periodic on the control channel
Select Re fulfillment transmits instructing the channel selection re fulfillment <br/> instructions sent to stop the subsequent traffic channel utilization on the downlink control channel when it becomes less than the traffic distribution stop threshold value decreases Mobile communication system characterized by performing
A traffic distribution scheme in the system is obtained .

The radio base station includes a main controller holding the traffic distribution start threshold and the traffic distribution stop threshold, and a downlink channel transmitter holding the channel selection re-execution instruction transmission cycle. The main controller always calculates the traffic channel usage rate of its own station, and when the calculated traffic channel usage rate is equal to or greater than the traffic distribution activation threshold, the main control apparatus channel with a periodicity based on the channel selection again fulfilled instruction transmitting periodic on the downlink control channel
Select Re fulfillment transmits instructing the channel selection re fulfillment <br/> instructions sent to stop the subsequent traffic channel utilization on the downlink control channel when it becomes less than the traffic distribution stop threshold value decreases Mobile communication system characterized by performing
A traffic distribution scheme in the system is obtained .

[0009]

Next, the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing a relationship between a traffic channel usage rate of a radio base station and transmission of a channel selection re-execution instruction in one embodiment of the present invention . Further, in FIG. 2 illustrates an application example of the present invention, (A) is a block diagram of a mobile communication system,
( B) is a block diagram of the wireless base station in FIG.

[0010] In FIG. 2 (A), the call between the mobile telephone terminal inter or mobile telephone terminals and a general wire telephone terminal is through the radio base station 20, 21, 22 and mobile telephone exchange 10 Done. The mobile telephone exchange 10 is connected to the radio base stations 20, 21 and 22 by combination lines 201, 211 and 221 of signal lines and communication lines, respectively . The radio base stations 20, 21 and 22 have fixed service areas 20a, 21a and 22a, respectively.
The mobile telephone terminal is provided for each of the mobile telephone terminals moving in the corresponding service area, and performs wireless calling, calling, answering, and relaying the call. An antenna for that purpose is provided in each of the radio base stations 20, 21 and 22, respectively . In the drawing, the radio base stations 20, 21 and 22 are shown as representatives, but other radio base stations (not shown) are set as areas which are partitioned without gaps.
It is connected to the mobile telephone exchange 10. The mobile telephone exchange 10 is connected to a general telephone network 40 by a communication line 30.

As shown in FIG. 2B, the radio base station 20 includes a main control device 1, a downlink control channel transmitting device 2, an uplink control channel receiving device 3, and a communication channel control device 4. Here, the downlink control channel transmitting device 2, the uplink control channel receiving device 3, and the traffic channel control device 4 are illustrated one by one, but a plurality of devices may be installed depending on the size of the radio base station. The mobile telephone exchange 10 is connected to the communication channel control device 4 via the communication line 201s. The downlink control channel transmitting device 2, the uplink control channel receiving device 3, and the communication channel control device 4 are multi-connected to the main control device 1 by a signal line 100.
And the mobile telephone exchange 10 are connected by a signal line 201c. Antennas 2a, 3a and 4a are connected to the downlink control channel transmitter 2, uplink control channel receiver 3 and traffic channel controller 4, respectively.

Next, the EIA, TA configured as described above
A traffic distribution method in a mobile communication system of the CS specification will be described.

[0013] traffic and traffic distribution shown in FIG. 1 from the call number channel activation threshold T1 and traffic distribution stop threshold value T2 and the channel selection re-performance is the radio base station odor Teso Resolution Re expected roughness and an instruction transmission period τ
Determine Me steering, to hold the traffic distribution start threshold T1 and traffic distribution stop threshold value T2 in FIG. 2 the main control device of each radio base station shown in (B) 1, channel selection re-implement instructions transmission period τ Is held in the downlink control channel transmitting apparatus 2. In each radio base station, the main controller 1 constantly calculates and monitors the traffic channel usage rate of its own station, and the traffic channel usage rate becomes equal to or greater than the traffic distribution activation threshold T1.
At this time , the control channel selection re-execution instruction is issued to the mobile phone terminal as Rescan Global Action.
It instructs the downlink control channel transmitting device 2 to start transmission of Overhead Message. On the basis of this transmission start instruction, the downlink control channel transmitting apparatus 2 transmits the Resc.
an Global Action Overhead
A message is transmitted from the antenna 2a to a downlink control channel.

Rescan Global Action
n Overhead Message mobile telephone terminal which has received the so reselect a control channel by scanning the channel range on the control channel defined Me beforehand, overlapping area b of the service area shown in Fig. 3, c,
d, e, f, is in the mobile telephone terminal located g appeared that reselects a control channel that is broadcast from another radio base station, traffic is distributed.

As described above, after the traffic distribution starts,
When the traffic volume in the service area a of the radio base station 20 decreases and becomes smaller than the traffic distribution stop threshold T2 shown in FIG. 1, the downlink control channel transmitter 2 is instructed to stop transmission of the control channel selection re-execution instruction. Thereby, the downlink control channel transmitting apparatus 2 stops the periodic transmission of the channel selection re-execution instruction.

[0016]

As described above, the present invention provides a method for transmitting a channel selection re-execution instruction on a downlink control channel when the traffic channel usage rate in one radio base station is increased, thereby enabling other radio base stations to transmit. having a mobile telephone terminal capable tuned to the downlink control channel Ru broadcasted Tei so as to tune to another radio base station, reduces the occurrence of a new call in the high traffic channel usage rate radio base station, traffic Has the effect of averaging
You . In addition, EIA, T
It is possible to realize traffic distribution without changing the specification of the ACS.
delivery of etry signals, it is possible to omit the control channel reselection of a mobile telephone terminal which has received the DirectedRetry signal, an effect of alleviating Oyo shortening beauty call connection time of the uplink and downlink control channel traffic Ru is realized Have.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a relationship between a traffic channel usage rate of a radio base station and transmission of a channel selection re-execution instruction according to an embodiment of the present invention.

2A and 2B are diagrams showing an application example of the present invention, in which FIG. 2A is a block diagram of a mobile communication system, and FIG. 2B is a block diagram of a radio base station in FIG.

FIG. 3 is a diagram showing an example of a service area of each of a plurality of radio base stations constituting a cellular mobile telephone system.

[4] (A), (B) is a diagram showing a call processing sequence of the normal call processing sequence, no idle traffic channel to be the traffic channel assignment for the call request from the respective mobile telephone terminal.

Continuation of the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) H04Q 7/00-7/38 H04B 7/24-7/26 102

Claims (2)

(57) [Claims] A wireless base station having a downlink control channel and an uplink control channel for transmitting a control signal between a radio base station and a mobile telephone terminal as a pair of control channels and having one station. a traffic distribution scheme in a mobile communication system carrying a plurality of speech channels at a station, the radio base station traffic distribution start threshold and the traffic from the traffic and calls the number of channels that are expected by the own station a dispersion stop threshold value and the channel selection re-implement instruction transmission period
The previously determined Me beforehand, calculates the ratio between the number of speech channels in use in the call and the total number of speech channels held as call channel usage rate, the calculated traffic channel utilization start the traffic distribution with periodicity based on the channel selection again fulfilled instruction transmitting periodic on the downlink control channel to the mobile telephone terminal when a threshold or to transmit the channel selection re performance instruction, then the call channel utilization before on the downlink control channel when but it becomes less than the traffic distribution stop threshold value decreases
Traffic distribution method in a mobile communication system, characterized by stopping the transmission of the serial channel selection re-implement instructions. 2. The radio base station, comprising: a main controller that holds the traffic distribution start threshold and the traffic distribution stop threshold; and a downlink channel transmitter that holds the channel selection re-execution instruction transmission cycle. Comprising, the main controller always calculates the traffic channel usage rate of its own station,
Channel with a periodicity based on the channel selection again fulfilled instruction transmitting periodic on the downlink control channel to the mobile telephone terminal when the calculated traffic channel usage rate becomes the traffic distribution start threshold or Reselection
Sends a fulfillment instruction to stop the <br/> transmission of said channel selection again fulfillment instructions on the downlink control channel when subsequent communication channel usage falls below reduced the traffic distribution stop threshold value The traffic distribution method in the mobile communication system according to claim 1, wherein: