JPH0685592B2 - Wireless channel traffic data transmission system - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a wireless channel traffic data transmission system, and more particularly to a wireless channel for transmitting wireless channel traffic data from a relay station to a subscriber station via a downlink control channel. Traffic data transmission method.

[Technical background of the invention and its problems]

In the multi-channel access method, the 800MHz band is divided into 25 systems, and the unit system consists of a pair of uplink and downlink control channels (hereinafter simply referred to as control channel when there is no need to distinguish between uplink and downlink) and uplink. , 15 lines with a pair of downlink communication channels (hereinafter, simply called a communication channel when it is not necessary to distinguish between upstream and downstream), and a communication channel and a control channel are collectively called a wireless channel) are allocated. The wireless zone consists of a radius of 15km to 20km, and a relay station is installed in the center. The number of subscribers accommodated is approximately
It operates at 5000, 0.5 calls per hour, average hold time of 20 seconds, queue limit of 15, average waiting time of 5.5 seconds, and line efficiency of 0.93. The subscriber stations form a unit subscriber station group including a command station FS and mobile stations MS _j (j is 0, 1, 2 ...), and subscriber stations belonging to the unit subscriber station group communicate with each other via the relay station BS. At the time of waiting for an incoming call, the command station FS and the mobile station MS _j move from the relay station BS in which the home zone Z ₀ (Z _{1 to} Z ₆ are adjacent zones) is installed to the downlink control channel R _o (as shown in FIG. ₁ ). The downlink radio channel R _n n = 0 is a downlink control channel, and n is 1 to 15 is a downlink communication channel.) The frame is synchronized with a downlink control signal broadcast. Calling the downlink control signal to a time slot uplink control channel T _{o (uplink} radio channel T _{n, n} = 0 is uplink control channel, n is from 1 to 15 and uplink traffic channel.) The uplink control signals via the Relay station
Send to BS. The relay station BS verifies the received uplink control signal. The downlink control signal is a 175-bit Hagerberger code, 1 bit is 0.83 mS 1200 bps, and 1 frame is 146 mS. The incoming call notification by the downlink control signal increases the reception chance of the subscriber station until the incoming call response is obtained (up to 10
Broadcast for a second). Since the downlink control signal uses the downlink control signal as a time slot, one frame has 115 bits and 96 mS (16 bits for bit synchronization, 84 bits for frame synchronization, 84 bits, 36 bits for valid data). Call volume per unit system for 14 erlangs is the average number of calls on hold
It will be 2500 degrees in 20 seconds. Since one frame is 100 mS, this call volume is 0.069 erlangs and the uplink control channel T
_{Since o} is calculated as a lost call, the call loss rate in this case is 0.061.
Becomes Since the call loss rate of 0.061 is quite high, it automatically acknowledges one re-call and keeps the probability of non-verification due to a collision with another call low. If the path to the calling test downlink in the downlink control channel R _o, uplink traffic channel R
_{1 to 15} and T ₁ to ₁₅ are designated. Received by antenna 3,
It transmits via the antenna 2. When there is no empty call channel, the channel is registered in the queue, and the fact that the channel has been registered in the queue is notified to the subscriber station via the downlink control channel _Ro . The queue limit is 15. The service index when the call volume a is 14 erlangs, the number of lines n is 15 and the queue limit number m is 15, and the waiting probability M (0) is expressed by equation (1). To 0.6. The call loss rate B is From equation (2), 0.02, the average number of queues L _q is It becomes 4.0 from the formula (3). Also, the average waiting time W _q is From equation (4), it will be 5.2 seconds.

The waiting time distribution P (T> t) of 10 seconds or more is It becomes 0.20 according to the equation (5). However, T is 20 seconds. The line efficiency η is 0.93, which is a very high waiting call. Therefore, when the call volume increases by 7%, the service index deteriorates sharply, and the waiting time distribution P (T> t) of 10 seconds or more is expressed by the formula (5). Becomes 0.5. The call loss rate B at this time is 0.0 from equation (2).
6 Congestion notification is given to this lost call, but reservation notification is only given to other calling subscribers, and the service index is unknown. Therefore, there is a drawback that the subscriber station does not know how long to wait before making a call.
When the mobile station MS moves to the adjacent zones Z ₁ to Z _6, call home zone Z ₀ uplink, downlink traffic channel T _{1 to 15,} R
₁₅ and adjacent zones Z ₁ to Z ₆ uplink, downlink traffic channel _{'T 1-15,'} performed in two relays via _{R 15.} Wide area receiving antennas 1 and 1'are used for transmission and reception at this time. Since the service index for 2 relays is extremely poor and not practical, the 1 relay call is given priority during the busy hour and the 2 relay calls are not handled. Usually in a metropolitan area such as Tokyo, it cannot be covered by home zone Z ₀ , so adjacent zone Z ₁
~ Z ₆ divides the call zone to cover. Therefore,
Treated with adjacent zones Z ₁ to Z ₆ and home zone Z ₀ is the same for belonging to economies between adjacent zones Z ₁ to Z ₆ and home zone Z ₀ traffic is often the same system and a loss call and waiting time of call If it, if you can not get the traffic data including adjacent zones Z ₁ to Z ₆ at the subscriber station increases invalid call, has drawbacks such as lowering the line efficiency eta.

[Object of the Invention]

The present invention has been made in view of the above-mentioned points, and a traffic data transmission method of a wireless channel for transmitting traffic data of a wireless channel from a relay station to a subscriber station during busy hours so that the subscriber station can use it to determine whether or not a call can be made. The purpose is to provide.

[Outline of Invention]

The present invention receives radio waves of a radio channel that can be monitored by a relay station and measures the traffic of the radio channel. Also, the measured traffic data is transmitted to the subscriber station via the downlink control channel. At the participating stations,
The service index is known from the transmitted traffic data, and it is determined whether or not the call can be made. The radio waves to be monitored are the uplink communication channel in the home zone and the downlink communication channel in the adjacent zone, and both are measured by the simultaneous operation method. When monitoring the uplink control channel of the home zone, the traffic data is the calling frequency.

[Embodiment of the Invention] An embodiment of a traffic data transmission system of a wireless channel according to the present invention will be described below with reference to the drawings.

In FIG. 2, 1 is a wide area receiving antenna, 2 is a transmitting antenna, and 3 is a receiving antenna. The relay station BS in the home zone Z ₀ always sends the downlink control signal to the subscriber stations (the mobile station MS _j and the command station FS) via the transmission antenna 2 by the downlink control channel R _o . Relay stations B'S in adjacent zones Z _{1 to} Z ₆
Radio waves transmitted via the R _n 'adjacent zones Z ₁ to Z ₆ within downlink radio channel to the subscriber station from the' transmission antenna 2 is intercepted by the wide area reception antenna 1. Similarly, the radio wave transmitted from the transmission antenna 2 of the relay station BS in the home zone Z ₀ via the downlink radio channel R _n can be intercepted by the wide area reception antenna 1 of the relay station B ′S in the adjacent zones Z _{1 to} Z _6. . Calls and transmissions from the subscriber stations are received by the receiving antenna 3 on the upstream radio channel T _n (n is 0 to 15). Signals related to transmission / reception are processed by the antenna sharing device 4, the receiving units 5 and 6, the transmitting unit 7, the line control unit 8 and the central control unit 9. The received radio waves branched from the antenna shared device 4 and monitored are passed through the traffic dedicated reception unit 10 and the scan matrix SCM.
To be active. Scan matrix SCM has 0 to 1 columns
It has a capacity of 112 bits in total with 5 bits and 0 to 6 columns. The scan unit is 0 to 15 bits, and the bit position is determined by the numerical value of the operation register R ₂ . The column is specified by the numerical value of the operation register R ₁ . Bits 0 to 15 in the 0th column allocate the upstream radio channel T _n (n is 0 to 15) of the home zone Z ₀ . Downlink radio channels'R _n (n is 0 to 15) of the adjacent zones Z _{1 to} Z ₆ are assigned 0 to 15 bits in columns 1 to 6. 0 row 0 bit uplink control channel T _o of the home zone Z ₀ is assigned. Since uplink control channel T _o is used to call through the uplink control signal to count the calling frequency. Bits 0 to _{1 to 6} are the downlink control channels of adjacent zones Z _{1 to} Z _6.
R _o . The downlink control channel'R _o is irrelevant to traffic because the downlink control signal is always transmitted.
Therefore, the corresponding bit is don't care. The radio channels T _{1 to} T ₁₅ , ′ R _{1 to} ′ R ₁₅ , ... Other than the above measure the call volume by the simultaneous operation method. The scanning program 15 shown in FIG. 3 is started every 6 seconds by an execution management program (not shown), and all scanning matrix SCMs are executed.
When the scanning of is completed, the process returns to the execution management program via the connector 31. When the scanning program 15 is activated, in process 16, the scan counter SCC of the counter CNT shown in FIG. 4 is incremented. It is judged in the judgment box 24 that the number of scanning times will be 10, and the numerical value of the traffic data TRD of the work memory WM shown in FIG. 7 is processed in the trunk registers TR _{o to} TR ₅₉ of the trunk memory TRM shown in FIG. copy. The trunk memory TRM shown in Fig. 6 has seven sides,
The trunk memory TRM is specified by the arithmetic register R ₁ .
Initialization of the arithmetic register R ₁ is performed in process 17. The numerical value of the calculation register R ₁ corresponds to the relay stations BS, B ′S, ... In the call zones Z _{0 to} Z ₆ . The initial value of the calculation register R ₂ is
Scan matrix SCM shown in Fig. 2 set to 15
Used to specify the bit position of. The columns and bit positions of the scan matrix SCM are determined by the numerical values of the arithmetic registers R ₁ and R ₂ , and the active / inactive state of the bit positions is stored in the arithmetic register R ₃ in the process 19. If the content of the arithmetic register R ₃ is “1”, the traffic data TRD of the work memory WM is stepped through in the processing box 21 via the judgment box 20 in the processing box 21. The program is executed in a loop by the process 23 until the value of the arithmetic register R ₂ that specifies the bit position changes from 15 to 1. Further, the column of the scan matrix SCM is updated in the process 28 via the judgment box 26. When the scan counter SCC reaches 10 times (6 seconds × 10 = 60 seconds) before entering the program loop, that is, the traffic data TRD is written in the corresponding position of the trunk memory TRM every minute. The trunk registers _{TRO to 59} are designated by the numerical values of the 1-minute timer 1MIN and the 3-minute timer 3MIN shown in FIG. 1MIN and 3MIN are linked to real time and return to 0 every hour. Trunk memory address TRMA shown in process 25 in Figure 8 searches a numeric arithmetic registers R _1, further trunk memory TRM _O～6 trunk register TR _o position 1 minute timer to Tr ₅₉ obtained by searching Specify with 1MIN. When the recording for all _TRM0 to 10 is completed, control is given to the execution management program.

Calling frequency of the uplink control channel T _o is counted by the call count program 32 shown in FIG. 9. Up control signal is about 10
Since it is 0 mS, the call number counting program 32 is activated in 16 mS cycles. The 16-millisecond timer 16MST is provided at the position of the 0th word, 16th to 29th bits of the work memory WM shown in FIG. 7, and the initial value is "11250" as shown in process 43. This 16MST is decremented by 1 in process 33 each time it is activated. When the value of 16MST is subtracted until it becomes "0", the process 45 is executed via the judgment box 42. The process 45 determines the TRMA search shown in FIG. 8 and the positions of the trunk registers TR _{o to} TR ₁₉ of the TRM ₁₀ . Also, the trunk register TR ₀ the value of the traffic counter TFCN shown in FIG. 7
Post to TR ₁₉ . Position in the scan matrix SCM uplink control channel T _o in the processing 34, 35 because it is 0 bit 0 columns, and this designation. Column 0 in process 36,
The active / inactive state of the 0-bit position is stored in the arithmetic register R ₃ . Since the rising time of the rising control signal is counted and the chattering at the rising time is not counted, the last look L is set to 30 bits and 31 bits of the work memory WM shown in FIG.
Provide L _o and LL ₁ . Now the first period of the periodic, first cycle, second cycle SCM (0 column 0 bit) LL _o and LL ₁ in processing 40 and 41 when "0" is "0". The In 3 processing cycle in SCM is "1" 37 LL _o is "0", LL ₁ is "0" SC
M is “1” and the value of the arithmetic register R ₁ is “0”. In process 40, SCM is “1” and LL _o is “0”, so LL ₁ is “1”, and in process 41, LL _o is “1”. Therefore, in the fourth cycle SCM, LL _o, LL ₁ is "1", "1", "1", the arithmetic register R ₁ is "1". In the fifth cycle, the calculation register R ₁ becomes “0”. Further, since the SCM becomes "0" at the time of falling of the ascending control signal, nothing is done.

The stored traffic data is sent to the subscriber station from the downlink control channel _{Ro by the} data sending program 46 shown in FIG. The transmission cycle is 21 seconds (144 frame cycle), and the traffic data is the data area d re-recorded in FIG. 11 of the first block data BL ₁ of the downlink control signal COR shown in FIG.
Knit to ₅ , d ₆ , and d ₇ . Data area d ₄ is a command,
"000" is notification "010" is congestion, "001" is reservation notification, "1"
"00" is the channel designation. For data transmission, refer to "11.
0 ”. The second block data BL ₂ is all “0”.
As for traffic data, wireless zones Z _{1 to} Z ₆ are allocated to d ₆ and d ₇ (18 to 29 bits) shown in Fig. 11 by 2 bits. 15 ~
17 bits allocate the wireless zone Z ₀ . Assigned The data Elijah d _5, d _6, d ₇ shown in FIG. 11 to organize the transmission data shown in Table.

The subscriber station always receives the downlink control signal, and the home zone Z ₀
And receives traffic data for adjacent zones Z ₁ -Z ₆ . Nothing is displayed when the transmission data is "00" as shown in item 0 of the table. In case of "01""10""11", wireless zone Z ₀
~Z Color such Groot transistors every ₆ to display change of the point deceleration.

The transmission data of home zone Z ₀ is “11” shown in No. 3 of the table.
Is abnormal congestion. The number of queues L _q is 7, the probability of receiving a congestion notification is 0.06, and the waiting time distribution P (10
> T) is 0.5. Calls within the service area are difficult due to congestion, and the recall operation must be abandoned. No. 2 in the table
The average waiting time W _q is 5 to 6 seconds, and the average number of queues L _q is 4, 10 because "10" shown in FIG.
The waiting time distribution P (10> t) that waits for more than a second is 0.2
Becomes The probability of receiving the congestion notification is 0.02. Therefore,
When the congestion notification is received, the recall operation may be performed 1 to 3 minutes after the recall is prohibited. In this case, a recall prohibit timer program may be provided. Calls within the home zone Z ₀ are in adjacent zones
Calls to home zone Z ₀ are possible because calls to Z _{1 to} Z ₆ are relayed preferentially, but calls to adjacent zones Z _{1 to} Z ₆ are possible.
60% or more rejected. With “01” in item 1 in the table, 90% of calls within the area can be called without waiting. 10% of the calls are waiting, but the average waiting time W _q is 2 seconds. Adjacent zone
If all of Z _{1 to} Z ₆ are “01” in item No. 1 of the table, the call loss rate is 0.2 and it is possible to talk to the adjacent zones Z _{1 to} Z ₆ . If the call cannot be made, 90% of the calls will be completed if the call is recalled. The transmission data of items 4 to 7 in the table is the home zone
Only for Z ₀ . For transmission data of No. 4. "100" call volume of 16 a traffic intensity above Erlang uplink control channel T _o increases, the relay station for collision of an uplink control signal
Can not decipher the uplink control signal in the BS _o. Up again,
Since the line efficiency of the downlink communication channel is 1.00 or more, the service index deteriorates and calling must be prohibited. Therefore, calling is prohibited by the calling prohibition program.
However, incoming call response is possible.

〔The invention's effect〕

The wireless channel traffic data transmission method according to the present invention is a wireless channel traffic measuring means for monitoring a wireless channel radio wave at a relay station to measure wireless channel traffic, and a traffic data obtained by the traffic measuring means is added from the relay station. Since it has a configuration including traffic data transmitting means for transmitting data to a station via a downlink control channel, it has a feature in transmitting a service index to a subscribing station in advance. Therefore, there is an effect that it is possible to suppress invalid calling.

Further, since the traffic measuring means of the radio channel is configured to count the frequency of the uplink control signal transmitted from the subscriber station to the relay station via the uplink control channel, the automatic recall due to the call collision is also counted. , Has features. Therefore, there is an effect that the traffic condition for the uplink control channel can be incorporated into the traffic data and appropriate traffic data can be transmitted.

Since the traffic measuring means of the wireless channel is configured to measure the vacancy of the upstream communication channel by the simultaneous operation method, it has a feature that the line efficiency can be measured regardless of the selection order of the wireless channels. For this reason, the accuracy of traffic measurement is improved, and there is an effect that appropriate traffic information can be obtained when used with high line efficiency.

Further, since the traffic measuring means of the wireless channel is configured to monitor the electric wave relayed from the relay station of the adjacent zone to the subscriber station within the adjacent zone via the downlink communication channel and measure the air blockage. The feature is that it can measure the traffic of the communication channels in the adjacent zones. Therefore, there is an effect that the traffic of the call channel of the adjacent zone can be measured without providing a special transmission path for traffic transmission, and a call to the adjacent zone can be processed as an immediate call.

[Brief description of drawings]

FIG. 1 is a relay system diagram of a wireless relay system according to the present invention. FIG. 2 is a block diagram of a relay station according to the present invention, and FIG.
The figure is a flowchart of the scanning program used in the relay station of FIG. 2, FIGS. 4, 5, 6, 7 and 8 are data configuration diagrams, and FIG. 9 is the relay station of FIG. A flow chart of the call number counting program 32 used, FIGS. 10 and 11 are data configuration diagrams, and FIG. 12 is a flow chart of the data transmission program. Reference numerals 1 and 1'in the figure denote wide-area receiving antennas,
2,2 ', 3,3' are antennas, 4 is an antenna joint device, 5 and 6 are receivers, 7 is a transmitter, 8 is a line controller, 9 is a central controller, 10 is a dedicated traffic receiver, 11 Is the data bus, 12
Is CPU, 13 is ROM, 14 is RAM, 14 is scanning program, 16,1
7,18,19,21,23,25,26,28,30,33,34,35,36,37,39,40,41,
43,44,45,48,49 is processing, 20,22,24,27,29,38,42,47 is a judgment box, 32 is a call number counting program, 46 is a data sending program, 1MIN is a 1 minute timer, 3MIN is 3 minutes timer, 16MST is 16ms timer, BS is relay station, MS _j is mobile station, FS is command station, SCM is scan matrix, SCC
Is the scan counter, TRMA is the trunk memory address,
TRM _{o to} TRM ₁₀ are trunk memories, TR _{o to} TR ₅₉ are trunk registers, and TFCN is a traffic counter.

Claims (1)

[Claims] 1. In a traffic data transmission method of a radio channel for controlling a call originating at a subscriber station according to traffic data, the frequency of an uplink control signal transmitted from a subscriber station to a relay station via an uplink control channel is counted. Means to do
A means for monitoring the radio waves transmitted from the subscriber station via the uplink call channel to measure the air blockage of the uplink call channel, and a relay from the relay station in the adjacent zone to the subscriber stations in the adjacent zone via the downlink notification channel. Monitor the radio waves
Generates traffic data for each zone, including the home zone, into multiple types of data from the data counted and measured by the means for measuring the emptyness of the downlink communication channel, and sends it to the subscriber station via the downlink control channel. A traffic data transmission method of a wireless channel, characterized by comprising traffic data transmission means for transmitting.