KR100380999B1 - Radio traffic data processing time distribution and decision method of asynchronous wireless communication system - Google Patents

Abstract

1. TECHNICAL FIELD OF THE INVENTION

The present invention relates to a radio traffic data processing time allocation and determination method in an asynchronous wireless communication system.

2. The technical problem to be solved by the invention

According to the present invention, the traffic handling module (THM) of a control station (that is, a radio network controller (RNC)) that accommodates radio traffic processing for a plurality of subscriber calls can receive as much as the subscriber capacity that accommodates a time corresponding to one frame length. Split the time slice and select a time slice that can transmit the frame so that the base station (ie, the wireless transceiver subsystem (RTS)) most accurately arrives at the time it expects reception. A method for allocating and determining radio traffic data processing time in an asynchronous wireless communication system in which frame transmission is periodically repeated at an accurate time by allocating to a task handling traffic of a call, and a program for realizing the method is recorded. To provide a computer-readable recording medium.

3. Summary of Solution to Invention

The present invention relates to a method for allocating and determining a radio traffic data processing time in an asynchronous wireless communication system, in which a traffic handling module accommodating a plurality of calls allocates a task for processing traffic for each call and assigns a frame time to a plurality of frames. Dividing into time slices and assigning them to each task; And in the radio transceiver subsystem, determine when the traffic processing task should start processing traffic so that the traffic frame arrives within the reception latency set for each frame at every frame period, and time slice corresponding to that time is determined. A second step of assigning.

4. Important uses of the invention

The present invention is used in asynchronous wireless communication systems and the like.

Description

Radio traffic data processing time distribution and decision method of asynchronous wireless communication system

The present invention relates to a method for allocating and determining a radio traffic data processing time in an asynchronous wireless communication system, and to a computer readable recording medium storing a program for realizing the method, in particular IMT-2000 (International Mobile Telecommunication-2000). A computer that records a radio traffic data processing time allocation and determination method for determining a timing of processing a traffic data frame to be transmitted to a base station by periodically transmitting a radio traffic data frame from a control station of an asynchronous system to a computer having recorded a program for realizing the method. The present invention relates to a readable recording medium.

A traffic handling module (THM) that handles wireless traffic on a dedicated channel must be able to handle multiple calls simultaneously. Therefore, the traffic handling module must provide radio traffic for up to several calls at the same time to the radio transceiver subsystem (RTS) at a predetermined time in each call at regular intervals to provide a service without loss of frames.

However, in the conventional system, when radio traffic data is transmitted from a higher layer, that is, a call control processor or a core network (core network (CN)), a method of immediately processing and immediately transferring the data to a base station is used. However, the traffic coming from the upper layer is often traffic that can be generated in large quantities intermittently, not periodically, depending on the nature of the service being serviced, and even in the case of periodic traffic, the propagation delay time of the traffic forwarding path is variable. Traffic arriving at the traffic processing module may not have a constant period. In addition, the traffic processing module of the control station handles traffic for the call from the standpoint of the individual call when processing the traffic as it is without distributing the processing time for each call because one processor accommodates multiple call processing. Cannot have a constant period.

As such, because the frequency and amount of traffic from the upper layer are variable and the control station needs to handle multiple calls at once, traffic for individual calls cannot be delivered to the base station with a certain period, and also WCMS (Wideband) CDMA Mobile System) In a system such as a wireless transceiver subsystem (RTS), a reception waiting time is set for each frame and a traffic frame arrives within that time, and thus, stable frame delivery cannot be guaranteed.

SUMMARY OF THE INVENTION The present invention has been proposed to solve the above problems, and is directed to a traffic handling module (THM) of a control station (i.e., radio network controller (RNC)) that accommodates radio traffic processing for multiple subscriber calls. Divide into time slices of subscriber capacity to accommodate the time corresponding to the frame length, and transmit the frame so that the base station (ie, wireless transceiver subsystem (RTS)) of the time slices arrives most accurately at the time it expects to receive. Allocating time slices and assigning the slices to tasks that handle traffic on the call, allocating time for radio traffic data processing in an asynchronous wireless communication system, allowing frame delivery to be repeated periodically at the correct time. And a computer readable record storing a determination method and a program for realizing the method. The purpose is to provide a medium.

1 is a diagram illustrating an embodiment of a method for allocating and determining a radio traffic data processing time in an asynchronous wireless communication system according to the present invention.

2 is a diagram illustrating an embodiment of waiting for a traffic frame to be received by an RTS in a method for allocating and determining a wireless traffic data processing time according to the present invention;

3 is a diagram illustrating an embodiment of a parameter related to synchronization between an RTS and an RNC in a method for allocating and determining a radio traffic data processing time according to the present invention;

4 is a diagram illustrating an embodiment of a time distribution process for a traffic processing task in a THM in a method for allocating and determining wireless traffic data processing time according to the present invention.

FIG. 5 is a diagram illustrating an embodiment of a time interval during which an RTS waits to receive a traffic frame in a method for allocating and determining a wireless traffic data processing time according to the present invention. FIG.

* Explanation of symbols for the main parts of the drawings

10: Radio Network Controller (RNC) 20: Traffic Handling Module (THM)

30 call control processor 40 core network (CN)

50: Wireless Transceiver Subsystem (RTS)

In order to achieve the above object, the present invention provides a method for allocating and determining a radio traffic data processing time in an asynchronous wireless communication system, and assigns a task for processing traffic for each call in a traffic handling module that accepts a plurality of calls, A first step of dividing one frame time into a plurality of time slices and assigning them to each task; And in allocating an appropriate time slice for each of the assigned tasks, the traffic processing task performs traffic processing to ensure that the traffic frame arrives within the reception latency defined for each frame at every frame period in the wireless transceiver subsystem. And a second step of determining a time point to start and allocating a time slice corresponding to the time point.

In addition, the present invention, in the asynchronous wireless communication system having a processor, the traffic handling module for accommodating a plurality of calls in the task to handle the traffic for each call, each frame time is divided into a plurality of time pieces each A first function of assigning to a task; And in allocating an appropriate time slice for each of the assigned tasks, the traffic processing task performs traffic processing to ensure that the traffic frame arrives within the reception latency defined for each frame at every frame period in the wireless transceiver subsystem. A computer readable recording medium having recorded thereon a program for realizing a second function of determining a time point to start and allocating a time slice corresponding to the time point is provided.

In the RTS, the base station of the IMT-2000 asynchronous system according to the present invention, a reception wait time is determined for each frame every frame period, and when a frame is received within that time, the radio is processed and sent out wirelessly, otherwise the frame is discarded. Accordingly, in the present invention, a traffic handling module (THM) for accommodating a plurality of calls allocates a task for processing traffic for each call, divides one frame time into a plurality of time slices, and assigns each task to each task. Use the method. In addition, as a method for allocating an appropriate time slice for each task, the traffic processing task must initiate traffic processing to ensure that the traffic frame sent by the traffic handling module arrives within the time expected by the radio transceiver subsystem (RTS). It suggests how to calculate the most appropriate time slice. Thus, the traffic frame is transmitted from the traffic handling module to the wireless transceiver subsystem at a predetermined time at a predetermined time, thereby preventing the loss of traffic data due to the propagation delay.

The above objects, features and advantages will become more apparent from the following detailed description taken in conjunction with the accompanying drawings. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The operation of the radio traffic data processing time allocation and determination method of the present invention having the above characteristics will be described in detail as follows.

First, it relates to node synchronization and downlink radio traffic data processing of the radio network controller 10 and the radio transceiver subsystem 50.

1 is a diagram illustrating an embodiment of a method for allocating and determining a radio traffic data processing time in an asynchronous wireless communication system according to the present invention.

As shown in FIG. 1, the traffic handling module 20 in the radio network controller 10 includes a call control processor 30 and a core network 40 at the top, and a wireless transceiver subsystem 50 at the bottom. A device for directly exchanging traffic data, wherein the uplink traffic data received from the terminal in the wireless transceiver subsystem 50 passes through the wireless traffic processing layer 2 process in the traffic handling module 20, and then the call control processor 30 or the core. On the contrary, the downlink traffic is transferred from the call control processor 30 or the core network 40 to the traffic handling module 20 to process the radio traffic processing layer 2 process, and then the radio transceiver subsystem ( 50), the wireless transceiver subsystem 50 configures the received traffic data into a radio frame and transmits it to the terminal.

On the other hand, in the processing and delivery of such radio traffic, the radio transceiver subsystem 50 and the radio network controller 10 are not in time synchronization with each other.

That is, the clock used in the wireless transceiver subsystem 50 and the clock used in the wireless network controller 10 are not synchronized at the same time as shown in FIG. RNC frame number counter (RFN) and cell system frame number counter (SFN), which are the frame counters of the wireless transceiver subsystem 50, have different values at one point in time. There is no absolute time available.

Therefore, in this asynchronous state, in order for each node to deliver traffic at a point in time desired by the other party, a node synchronization process that finds a relationship between the other's time and its own time is required, which is illustrated in FIG. 2.

That is, in the node synchronization process, when the radio network controller 10 sends the downlink node synchronization control frame carrying the T1 (11) value of FIG. 2 to the radio transceiver subsystem 50, the radio transceiver subsystem 50 responds thereto. By the procedure of sending an uplink node synchronous control frame carrying the T2 (21) and T3 (31) of Figure 2 to the radio network controller 10. In FIG. 2, T1 11 is an RFN value at the time when the wireless network controller 10 transmits a downlink node synchronization control frame to the wireless transceiver subsystem 50, and T2 21 is a downlink node sent by the wireless network controller 10. SFN value at the time when the wireless transceiver subsystem 50 receives the synchronization control frame, and T3 31 is the SFN value at the time when the wireless transceiver subsystem 50 sends the uplink node synchronization control frame to the radio network controller 10. , T4 (41) represents the RFN value at the time when the radio network controller 10 receives the up-node synchronous control frame sent by the radio transceiver subsystem 50, respectively.

In a state of node synchronization between the radio network controller 10 and the radio transceiver subsystem 50, the radio network controller 10 may allow traffic frames to arrive at a time desired by the radio transceiver subsystem 50. When the call control processor 30 or the core network 40 generates traffic to be delivered to the terminal, the call control processor 30 or the core network 40 sends the traffic control module 20 to the traffic handling module 20. The traffic handling module 20 transfers the reconstructed frame through the radio traffic layer 2 process for the received frame to the wireless transceiver subsystem 50 through a transmission channel allocated by the call processing processor when setting up a call. The frame is attached with a CFN (Connection Frame Number), which is a frame number for layer 2 and transmission channel synchronization between the terminal and the WCMS. In order for the frame to be received and processed by the wireless transceiver subsystem 50, the wireless transceiver is illustrated in FIG. The subsystem 50 must arrive at the wireless transceiver subsystem 50 within the reception wait time interval 12 set for this frame.

In FIG. 3, the reception wait time interval 12 represents a time interval during which the wireless transceiver subsystem 50 waits to receive a frame whose CFN is N 22. In addition, CFN is a value having a deviation between SFN and DOFF (Default Dedicated Physical Channel Offset Value) 32, and DOFF 32 is a value that call control processor 30 assigns to each call at the beginning of call setup.

In addition, the reception wait time intervals for traffic frames of each call in the wireless transceiver subsystem 50 include a Test Time of Arrival (LTOA) 42, a Time of ArrivalWindow Startpoint (TOAWS) 52, and a Time of Arrival Window Endpoint (TOAWE). (62) and the like.

Here, the LTOA 42 value means a time required for the radio transceiver subsystem 50 to process a frame received from the radio network controller 10 and to fly to the radio channel, and the system parameter of the radio transceiver subsystem 50. This is a value that the wireless network controller 10 has known since the system configuration. The TOAWS 52 and the TOAWE 62 determine the value by the call processing processor 30 so that the start and end points of the reception wait time can be determined so that the radio transceiver subsystem 50 and the traffic handling module 20 can be initially set up. ).

In order for the downlink traffic frame to arrive within the determined reception waiting time interval, the traffic handling module 20 may recognize the reception waiting time interval set for the frame having the specific CFN and arrive therein. The time at which the frame should be transmitted is determined using the values of T1 (11) and T2 (21) obtained through node synchronization.

Second, the operation triggering of the task in the traffic handling module 20 is as follows.

The traffic handling module 20 of the WCMS must handle multiple calls simultaneously. Therefore, if the traffic handling module 20 is designed to handle a total of M calls, the application software of the traffic handling module 20 may handle M traffic processing tasks and call processing to individually perform traffic processing for M calls. It consists of a main control task that allocates traffic handling tasks to each call and handles the interface with the call control processor when a call is requested from the processor.

When a call is assigned, the traffic processing task operates every 20ms. If all of the M traffic processing tasks operate by allocating a call, M tasks must perform the traffic processing operation once every 20ms. Therefore, the present invention uses a method of dividing the 20 ms time into a plurality of pieces and assigning each traffic processing task to each traffic processing task such that all traffic processing tasks operate at an accurate 20 ms period. That is, each traffic processing task is assigned a location within 20 ms time, and the traffic processing operation is performed only at that time.

The application program of the traffic handling module 20 receives clock interrupts of 100 Hz and 800 Hz and uses them to trigger tasks. The 100 Hz clock interrupt service routine reads the RFN value supplied to all hardware in the wireless network controller 10. The 800 Hz clock interrupt service routine determines the operating time determined by each traffic processing task at the beginning of operation and the current time at which this interrupt occurred. It plays a role of operating traffic processing task with reference to time. In other words, when an 800Hz clock interrupt occurs, it finds out which position within the 20ms frame time the current time corresponds to, and puts tasks registered to operate at the position to operate in the pending state.

Therefore, the downlink traffic delivered to the traffic handling module 20 is not processed immediately upon arrival, but is started by the 800 Hz clock interrupt service routine when the task assigned to handle the traffic reaches the operation time assigned to the task. If so, it is processed and transmitted to the RTS.

Third, the time slice distribution process for the time fragment splitting and traffic processing tasks is as follows.

In the case of dedicated channel traffic in the service provided by the base station, the traffic handling module 20 and the wireless transceiver subsystem 50 exchange frames of at least 20 ms in length, so the traffic handling module 20 receives 20 ms of time for each call. Up and down traffic should be handled at periodic intervals. In addition, if the traffic handling module 20 is designed to handle a total of M calls simultaneously, the traffic handling module 20 should be able to operate M traffic processing tasks.

Thus, the time that can be allocated to one traffic processing task in the traffic handling module 20 is arithmetically 20 / M ms of 20 ms. However, since the THM is provided with a 100 Hz clock interrupt and an 800 Hz clock interrupt, that is, interrupts of 10 ms and 1.25 ms periods, in the present invention, a time slice that can be allocated to one task in the division of the time slice is divided into 1.25 ms as shown in FIG. It is time to correspond. Therefore, both the 20ms time is established the 16 time slices, receives the M number of M task by allocating a maximum M / 16 heading in a single time slice is greater than 16.

Finally, the time slice selection process of the traffic processing task is as follows.

The traffic processing task is transferred from the traffic handling module 20 to the wireless transceiver subsystem 50 using TOAWS, TOAWE, T1, T2, LTOA, etc., information received from the call processing processor immediately after the traffic processing is assigned by the main control task. Determine when to handle downstream traffic that needs to be delivered, and then assign the closest time slice to it.

5 should be assigned as a result of calculating the time interval at which the radio transceiver subsystem 50 waits to receive a traffic frame and when the traffic handling module 20 should transmit the frame so that it can arrive within the time interval and as a result. The equation for finding a time slice is given. However, in FIG. 5, reference numerals 23 to 123 use values increasing by 1 in 0.125 ms, and reference numeral 13 denotes values increasing by 1 in 10 ms.

RFN is a value of a frame counter commonly used by all the subsystems and modules in the radio network controller 10, and SFN is a value of a frame counter commonly used in one cell of the wireless transceiver subsystem 50, and these frames All counter values are incremented by 1 every 10ms, and cycles from '0' to '4095'. In the following description, RFN and SFN are used to refer to a specific instant. Therefore, the RFN and SFN may be expressed as non-integer values. In addition, the RFN and SFN may be converted to values of 0.125ms in all equations of FIG. 5. CFN is a frame counter value used independently for one call and is used as a frame number of a radio traffic frame, and is a value calculated from SFN by DOFF allocated by each call processing processor of the radio network controller 10 for each call, and 10ms Is incremented by 1 to cycle from '0' to '255'. CFN can also be expressed as a non-integer value as it refers to a specific moment in the following description, and is converted to a value of 0.125ms in all equations of FIG. 5.

In addition, in FIG. 5, thmTxRfn 43 is an RFN value at the moment when a traffic frame is transmitted by the traffic handling module 20, and ceRxSfn 53 is a wireless transceiver subsystem 50 in which a traffic frame transmitted by the traffic handling module 20 is transmitted. SFN value at the moment of arrival at the channel element in charge of traffic processing for each channel, rtsTxSfn (83) is SFN at the time when the traffic frame of N (13) which is CFN is transmitted from the wireless transceiver subsystem 50 to the terminal. The value, and rtsProcTime 63, represents the processing time until the traffic frame sent by the traffic handling module 20 arrives at the wireless transceiver subsystem 50 and is transmitted to the terminal.

The call processing processor 30 of the radio network controller 10 assigns a DOFF value for that call when starting service for one call, and the wireless transceiver subsystem 50 sends a DOFF, call from the call processing processor 30, The TOAWS and TOAWE values are used to determine the reception wait time interval for each frame at every frame period. That is, the reception waiting time interval of the frame whose CFN is N (13) is from (23) point to (33) point.

The traffic frame transmitted by the traffic handling module 20 at the moment when the RFN is thmtxRfn 43 arrives at the wireless transceiver subsystem 50 at the moment when the SFN is ceRxSfn 53 and is sent wirelessly at the moment when the CFN is N. This traffic frame then stays in the wireless transceiver subsystem 50 for rtsProcTime 63 until it arrives at the wireless transceiver subsystem 50 and flies wirelessly, thus ceRxSfn 53 is represented by equation (73). In equation (73), rtsTxSfn 83, which is the SFN value at the moment when CFN is N , is expressed as equation (93) because there is a difference by CFN and DOFF.

In the present invention, the rtsProcTime (63) is represented by the equation (103) so that ceRxSfn (73) is located at the center between the points (23) and (33), which are reception waiting intervals. thmTxRfn (43) can be represented by (113) using the point that the difference between thmTxRfn (43) and T1 is the same as the difference between ceRxSfn (73) and T2 (21). Therefore, thmTxRfn (43) can be represented by equation (123) using equations (73), (93), (103) and (113). Here, N value is an arbitrary integer value, and (4096 * 80) is added to the beginning of the right term of Equation (123) in order to prevent negative numbers.

In the above description, when the traffic handling module 20 delivers a traffic frame to the wireless transceiver subsystem 50 at 20 ms intervals, the traffic handling module 20 converts the RFN into a value of 0.125 ms. If traffic frames are forwarded at thmTxRfn, thmTxRfn + (2 * 80), thmTxRfn + (4 * 80), etc., the RTS can be stably received. Therefore, if you divide 20ms into 16 time slices in THM and number each time slice from 0 to 15 in order as shown in Fig. 4, the number of time slices (timeSegNum) to be allocated to transmit traffic at the moment of thmTxRfn. Is represented by equation (133) in consideration of the processing time in the traffic handling module 20. In Equation (133), the value of THM_PROC_TIME is a value representing the processing time in THM. The value of THM_PROC_TIME is determined and used in consideration of the type of the service call and the radio transmission rate.

The method of the present invention as described above may be implemented as a program and stored in a computer-readable recording medium (CD-ROM, RAM, ROM, floppy disk, hard disk, magneto-optical disk, etc.).

The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and various substitutions, modifications, and changes are possible in the art without departing from the technical spirit of the present invention. It will be apparent to those of ordinary knowledge.

The present invention as described above, the traffic handling module for receiving the radio traffic processing for a plurality of subscriber calls divided into time slices of the subscriber capacity to accommodate the time corresponding to the minimum frame length, the radio of the time pieces By selecting a time slice that can transmit a frame so that the transceiver subsystem arrives most accurately at the time it expects to receive it and assigning that time slice to the task that handles traffic for that call, frame forwarding on each call is periodically scheduled at the correct time. Can be repeated. This method allows the wireless transceiver subsystem to receive traffic data from the traffic handling module at the expected time, thereby delaying the reception of the traffic data when configuring the radio traffic frame to be transmitted to the terminal in the wireless transceiver subsystem. This can improve the quality of services by preventing them from being configured in a timely manner.

Claims (5)

In the radio traffic data processing time allocation and determination method in an asynchronous wireless communication system, A first step of allocating a task for processing traffic for each call in a traffic handling module that accepts a plurality of calls, dividing one frame time into a plurality of time slices and assigning each task to each task; And In allocating an appropriate time slice for each assigned task, the traffic processing task starts traffic processing to ensure that the traffic frame arrives within the reception latency defined for each frame at every frame period in the wireless transceiver subsystem. The second step in determining when to do it and assigning a time slice corresponding to that time Wireless traffic data processing time allocation and determination method comprising a. The method of claim 1, The traffic processing task, When a call is assigned, the operation is performed in 20 ms periods. When all M traffic processing tasks are assigned and operated, M tasks perform traffic processing operations once every 20 ms in order to convert the time of the 20 ms period into a plurality of pieces. A method for allocating and determining wireless traffic data processing time, the method comprising dividing and assigning each traffic processing task. The method according to claim 1 or 2, The traffic processing task, After the traffic processing is assigned by the main control task, information received from the call processing processor, such as time of arrival window startpoint (TOAWS), time of arrival window endpoint (TOAWE), T1, T2, and test time of arrival (LTOA), etc. And determining a processing time of downlink traffic that should be delivered from the traffic handling module to the wireless transceiver subsystem, and then assigning the closest time slice at this time. The method of claim 3, wherein The time slice distribution process for the traffic processing task, Allows a task to allocate all its time slices into 16 time slices in 20 ms, so that when M is greater than 16, it allocates up to M / 16 calls to one time slice to accommodate M tasks Wireless traffic data processing time allocation and determination method, characterized in that. In an asynchronous wireless communication system having a processor, A first function of allocating a task for processing traffic for each call in a traffic handling module that accepts a plurality of calls, dividing one frame time into a plurality of time slices and assigning each task to each task; And In allocating an appropriate time slice for each assigned task, the traffic processing task starts traffic processing to ensure that the traffic frame arrives within the reception latency defined for each frame at every frame period in the wireless transceiver subsystem. Second function for determining when to do it and assigning a time slice corresponding to that time A computer-readable recording medium having recorded thereon a program for realizing this.