KR100416048B1 - Frame synchronous preservation method between RNC and RTS in wireless communication system - Google Patents

Abstract

The present invention relates to a method for maintaining frame synchronization between a control station and a base station in a wireless communication system, and to a computer-readable recording medium having recorded thereon a program for realizing the method, wherein the control station (RNC) of a wireless communication system includes a base station (RTS). In a method of maintaining frame synchronization between a control station and a base station in a wireless communication system in order to quickly recover from synchronization while maintaining synchronization for a traffic forwarding channel in a simple manner, the traffic handling module of the control station may call a call. A first step of obtaining a system time switching factor using information obtained through node synchronization between the control station and the base station implemented during the setting and transmission channel synchronization related information received during call setting from the call control processor of the control station; When constructing a frame in the traffic handling module, a second step of calculating a frame number (CFN) of the frame by adding a time to transmit a frame and the system time conversion factor; And a third step of maintaining frame synchronization by changing the system time switching factor by the amount of synchronization out of sync when the frame synchronization is out of synchronization with the control station and the base station.

Description

Frame synchronous preservation method between RNC and RTS in wireless communication system in wireless communication system

The present invention realizes a method and method for maintaining frame synchronization between a control station (i.e., Radio Network Controller (RNC)) and a base station (i.e., Radio Transceiver Subsystem (RTS)) in a wireless communication system. The present invention relates to a computer-readable recording medium that records a program for making a program, and in particular, asynchronous mobile communication system (WCMS: Wideband CDMA Mobile) based on a next generation mobile communication network such as International Mobile Telecommunication (IMT-2000) or Universal Mobile Telecommunications System (UMTS). Maintaining frame synchronization between the radio network controller (RNC) and the radio transceiver subsystem (RTS) when transferring downlink radio traffic data frames from the radio network controller (RNC) of the system to the radio transceiver subsystem (RTS).

The Traffic Handling Module (THM) of the Radio Network Controller (RNC) must deliver radio traffic for multiple calls at the same time, to the Radio Transceiver Subsystem (RTS) at exactly the scheduled time on each transport channel without loss of data. Can provide services. This is because the radio transceiver subsystem (RTS) sets a wait time for all downlink transport channel frames, processes them when they come in, and blows them off wirelessly, otherwise the frames are discarded. Determination of whether or not the arrival time is determined by the connection frame number (CFN) attached to each frame and the system time of the radio transceiver subsystem (RTS) receiving the frame. When the transport channel frame configured in the traffic handling module (THM) arrives within the time expected by the radio transceiver subsystem (RTS), it is said that the transport channel synchronization is maintained between the radio network controller (RNC) and the radio transceiver subsystem (RTS).

Thus, in order for the radio network controller (RNC) and the radio transceiver subsystem (RTS) that are independent of each other's system time to achieve transmission channel synchronization, node synchronization between the radio transceiver subsystem (RTS) and the radio network controller (RNC) is performed. ), And in the node synchronization operation, the traffic handling module (THM) of the radio network controller (RNC) writes T1, which is the system time of the radio network controller (RNC) at the time of transmitting the synchronization control frame, to the synchronization control frame. The transceiver is sent to the transceiver subsystem (RTS), and the wireless transceiver subsystem (RTS) writes the time T2 at which this sync control frame arrived to its system time and sends it to the traffic handling module (THM). At this time, the traffic handling module (THM) uses the T1 and T2 values, and the default dedicated physical channel offset value (DOFF), LTOA (Latest Time of Arrival), and TOAWS (Time), which are transmission channel synchronization related information received at the call setup from the call control processor. Can be used to calculate the CFN to assign the Arrival Window Startpoint (TOAWE) and the Time of Arrival Window Endpoint (TOAWE) to the delivery channel frame.

However, if the traffic handling module (THM) calculates CFN using T1, T2, DOFF, LTOA, TOAWS, and TOAWE values while processing every frame, complex calculations are repeated and radio access network (RAN: Radio) is called during the call. If the traffic transmission environment between the radio transceiver subsystem (RTS) and the radio network controller (RNC) changes due to a change in load on the access network, the radio network controller (RNC) and the radio transceiver subsystem (RTS) are changed again. It is necessary to obtain new T1 and T2 values through node synchronization operation between nodes, thus increasing the time required for new synchronization, and consequently, the amount of traffic data to be transferred from the radio network controller (RNC) to the radio transceiver subsystem (RTS). There has been a problem that the loss is aggravated or the wireless traffic is delayed.

SUMMARY OF THE INVENTION The present invention has been proposed to meet the above-mentioned demands. The present invention provides a simple method to quickly synchronize synchronization of a traffic transmission channel from a control station (RNC) to a base station (RTS) in a wireless communication system. It is an object of the present invention to provide a method for maintaining frame synchronization between a control station (RNC) and a base station (RTS) for recovery and a computer-readable recording medium having recorded thereon a program for realizing the method.

1 is an exemplary configuration of a radio access network (RAN) for processing radio traffic data in a radio communication system to which the present invention is applied.

2 is a diagram illustrating an embodiment of a node synchronization operation between a radio network controller (RNC) and a radio transceiver subsystem (RTS) in a radio access network for a frame synchronization maintaining method according to the present invention.

3 is a diagram illustrating an embodiment of parameters related to transmission channel synchronization between a radio network controller (RNC) and a radio transceiver subsystem (RTS) in the transmission of downlink traffic frames for a frame synchronization maintaining method according to the present invention.

4 is a diagram illustrating an embodiment of a transmission time distribution and allocation process in a method of transmitting a downlink transport channel frame for a frame synchronization maintaining method according to the present invention;

FIG. 5 is a diagram illustrating an embodiment of calculating a connection frame number (CFN) of a downlink transport channel frame for a frame synchronization maintaining method 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: radio transceiver subsystem (RTS) 60: radio access network (RAN)

According to an aspect of the present invention, there is provided a method for maintaining frame synchronization between a control station and a base station in a wireless communication system, wherein the node synchronization operation between the control station and the base station performed by a traffic handling module of the control station when a call is established. A first step of obtaining a system time conversion factor using information obtained through the control information and transmission channel synchronization related information received at the time of call establishment from the call control processor of the control station; When constructing a frame in the traffic handling module, a second step of calculating a frame number (CFN) of the frame by adding a time to transmit a frame and the system time conversion factor; And a third step of maintaining frame synchronization by changing the system time switching factor by an amount of synchronization out of synchronization when the frame synchronization is out of synchronization with the control station and the base station.

In order to maintain frame synchronization between a control station and a base station, the present invention provides a node communication operation between the control station and the base station performed by a traffic handling module of the control station during a call setup in a wireless communication system having a processor. A first function of obtaining a system time transition factor by using the information obtained through the transmission channel synchronization-related information received at the time of call setup from the call control processor of the control station; A second function of calculating a frame number (CFN) of a corresponding frame by adding a time to transmit a frame and the system time conversion factor when configuring a frame in the traffic handling module; And when the frame synchronization is shifted between the control station and the base station, the computer-readable recording medium having recorded thereon a program for realizing the third function of maintaining frame synchronization by changing the system time switching factor by the amount of synchronization. To provide.

The present invention relates to a transmission channel in an environment in which a traffic handling module (THM) of a control station (radio network controller (RNC)) maintains a traffic transmission time between a base station (radio transceiver subsystem (RTS)) and a control station (RNC) at regular intervals. The frame number information CFN is to be assigned so that the delivery channel frame arrives within the reception waiting time set by the base station (RTS) for the frame.

That is, the present invention provides T1 and T2 values obtained through node synchronization operation between the radio network controller (RNC) and the radio transceiver subsystem (RTS) implemented by the traffic handling module (THM) of the radio network controller (RNC). By using DOFF, LTOA, TOAWS, and TOAWE values, which are received from the call control processor, the system time conversion factor is obtained to calculate the CFN of the frame to be sent in the current system time of the RNC. It is used to calculate the CFN of the frame to be sent to the radio transceiver subsystem (RTS) to facilitate the calculation of the CFN, and when the synchronization of the load on the radio access network (RAN) is out of sync, a new radio network controller (RNC) Transmit channel synchronization simply by changing this system time transition factor by the amount of out-of-synchronization without having to perform node synchronization operations between the system and the radio transceiver subsystem (RTS). So it can recover.

To this end, the present invention provides DOFF, LTOA, which is the information received by the traffic handling module (THM) from the T1, T2 and call control processor obtained by node synchronization between the radio network controller (RNC) and the radio transceiver subsystem (RTS). By using the TOAWS and TOAWE values, the system time conversion factor for easily calculating the CFN of the frame to be sent in the current system time of the RNC is obtained, and the traffic handling module of the RNC When the frame is composed in THM, the CFN of the frame is calculated by adding the time to transmit the frame and the system time conversion factor, and the amount of out-of-synchronization when the synchronization is out of sync due to a change in load on the radio access network (RAN). Motivation is restored by changing this system time conversion factor as much as possible.

As a result, the present invention can maintain and quickly recover transmission channel synchronization between the control station (RNC) and the base station (RTS), thereby preventing transmission delay and loss of radio traffic data transmitted to a user equipment (UE).

In summary, in the present invention, the radio transceiver subsystem (RTS) sets a reception waiting time for all downlink transmission channel frames, processes the frames if they come in, and then blows them out wirelessly, otherwise the frames are discarded. At this time, whether the frame has arrived within the reception waiting time is determined by the CFN attached to each frame and the system time of the radio transceiver subsystem (RTS) that received the frame. According to the present invention, when a CFN is assigned to a frame by a traffic handling module (THM) that configures a downlink traffic frame and transmits it to a radio transceiver subsystem (RTS), a node between the radio network controller (RNC) and the radio transceiver subsystem (RTS) is used. By using the T1 and T2 values obtained through synchronization and the system time conversion factor calculated by DOFF, LTOA, TOAWS, TOAWE, etc. received from the call control processor, the CFN calculation is facilitated, and the load on the wireless access network If synchronization is out of sync due to a change, synchronization can be restored simply by changing this system time shift factor by the amount of out of sync without having to perform a new node sync operation.

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.

Hereinafter, the CFN calculation process for the transmission channel synchronization between the radio network controller (RNC) and the radio transceiver subsystem (RTS) of the present invention will be described in detail.

First, a downlink radio traffic data processing process and a node synchronization operation of a radio network controller (RNC) and a radio transceiver subsystem (RTS) are as follows.

FIG. 1 is a diagram illustrating a configuration of a radio access network (RAN) for radio traffic data processing in a radio communication system to which the present invention is applied, and shows a radio access network (RAN) for traffic frame processing in an asynchronous mobile communication system (WCMS).

As shown in FIG. 1, the traffic handling module (THM) 20 in the radio network controller (RNC) 10 may be configured to include a call control processor 30 and a core network (CN) 40. A device for exchanging traffic data directly with the radio transceiver subsystem (RTS) 50, and the upstream traffic data received from the terminal (UE) in the radio transceiver subsystem (RTS) 50 is a traffic handling module (THM). After passing through the radio traffic processing layer 2 process in step (20), the data is transferred to the call control processor 30 or the core network (CN) 40. On the contrary, the downlink traffic data is transferred to the call control processor 30 or the core network (CN) ( 40 to the traffic handling module (THM) 20 to complete the processing of the radio traffic processing layer 2 process and then to the wireless transceiver subsystem (RTS) 50, and to the wireless transceiver subsystem (RTS) 50 The terminal configures the received traffic data into a radio frame And transmits the (UE).

On the other hand, in the processing and delivery of such radio traffic, the radio transceiver subsystem (RTS) 50 and the radio network controller (RNC) 10 are independent of each other in system time. That is, the clock used by the radio transceiver subsystem (RTS) 50 and the clock used by the radio network controller (RNC) 10 are not synchronized at the same time as shown in FIG. Cell System Frame Number (SFN), which is a frame counter value used as the system time of the radio network controller (RNC) 10, and a frame counter value used as the system time of the radio transceiver subsystem (RTS) 50. ) Has different values at any one point, and there is no absolute time that can be used in common between two nodes.

Therefore, in this asynchronous state, each node needs a node synchronous operation to find out the relationship between the other's time and its own time in order to deliver traffic at the time desired by the other party, which is illustrated in FIG. 2.

That is, the node synchronous operation may be performed when the radio network controller (RNC) 10 sends a downlink node synchronous control frame carrying a T1 (11) value to the radio transceiver subsystem (RTS) 50, as shown in FIG. In response, the radio transceiver subsystem (RTS) 50 is sent to the radio network controller (RNC) 10 by sending an upstream node synchronous control frame carrying the values of T2 (21) and T3 (31).

In FIG. 2, T1 11 is an RFN at the time when a radio network controller (RNC) 10 sends a downlink node synchronous control frame to the radio transceiver subsystem (RTS) 50, and T2 21 is a radio network controller ( SFN at the point when the radio transceiver subsystem (RTS) 50 receives the downlink node synchronous control frame sent by the RNC) 10, the T3 31 is uplink node synchronous control by the radio transceiver subsystem (RTS) 50; The SFN at the time the frame is sent to the radio network controller (RNC) 10, T4 (41) is the radio network controller (RNC) 10 to transmit the uplink node synchronization control frame sent by the radio transceiver subsystem (RTS) (50). Each RFN at the time of receipt is shown.

With the node synchronous operation completed between the radio network controller (RNC) 10 and the radio transceiver subsystem (RTS) 50, the radio network controller (RNC) 10 is configured to allow the radio transceiver subsystem (RTS) 50 to operate. You can make the frame arrive in the time you want. When the call control processor 30 or the core network (CN) 40 generates traffic to be delivered to the terminal (UE), it sends it to the traffic handling module (THM) 20. In response to this, the traffic handling module (THM) 20 transmits a radio transceiver subsystem through a transmission channel allocated by the call control processor 30 when a call is set up through a radio traffic layer 2 process for a received frame. RTS), and each frame is attached with a CFN (Connection Frame Number), which is a frame number for layer 2 transmission channel synchronization between the UE and the RAN 60. In order for a frame to be received and processed by the radio transceiver subsystem (RTS) 50, the radio transceiver within the reception wait time interval 12 set by the radio transceiver subsystem (RTS) 50 for this frame as shown in FIG. It should arrive at subsystem (RTS) 50.

In FIG. 3, the reception waiting time interval 12 is set with respect to the frame attached with CFN called N22. CFN is actually a time value with a deviation between SFN and DOFF 32, and DOFF 32 is a value that call control processor 30 assigns to each transport channel at the beginning of call setup. That is, while SFN is the system time of the radio transceiver subsystem (RTS) 50, CFN is the system time of each call and delivery channel frame. Therefore, the CFN-labeled frame N (22) arrives at the radio transceiver subsystem (RTS) 50 within the reception wait time interval 12, undergoes processing, and then at the moment when the CFN becomes N (22). UE).

The reception wait time interval for each transport channel frame in the radio transceiver subsystem (RTS) 50 is determined by parameters such as LTOA 42, TOAWS 52, TOAWE 62, and the like. Here, the LTOA 42 value means a time required for the radio transceiver subsystem (RTS) 50 to process a frame received from the radio network controller (RNC) 10 and fly it over a radio channel, and the radio transceiver subsystem As a system parameter of the (RTS) 50, it is a value that the radio network controller (RNC) 10 has known since system configuration. Also, the TOAWS 52 and the TOAWE 62 are parameters for specifying the start and end points of the reception wait time 12, and the call control processor 30 determines the values so that the radio transceiver subsystem (RTS) can be used at the initial call setup. 50) and the traffic handling module (THM) 20.

In order for the downlink transport channel frame to arrive within the thus determined reception latency interval 12, the traffic handling module (THM) 20 has a starting point of the reception latency interval 12 set for the frame having a particular CFN. T1 (11) obtained through node synchronization knowing the end point and at which time the traffic handling module (THM) 20 should transmit the frame in order for the frame to arrive at the radio transceiver subsystem (RTS) 50. , T2 21 and DOFF 32, LTOA 42, TOAWS 52, TOAWE 62, and the like.

Second, the traffic frame transmission time and transmission triggering for each transport channel of the traffic handling module (THM) 20 are as follows.

In the asynchronous mobile communication system (WCMS), the application of the traffic handling module (THM) 20 receives and uses clock interrupts of 100 Hz and 800 Hz. The 100 Hz clock interrupt service routine is used for all hardware in the radio network controller (RNC) 10. The RFN supplied to it is read, and the 800Hz clock interrupt service routine performs frame transmission triggering on each delivery channel.

In the asynchronous mobile communication system (WCMS), a frame of a dedicated delivery channel carrying signal traffic has a transmission period of 40 ms, a frame of a dedicated delivery channel carrying user traffic 20 ms, and a frame of a common delivery channel 10 ms. Accordingly, the traffic handling module (THM) 20 uses a method of dividing a frame period time into a plurality of pieces and assigning each transport channel to each frame so that the frames of all transport channels can operate correctly at their respective periods. do.

4 shows a case of a frame of a dedicated delivery channel for delivering user traffic having a frame period of 20 ms. The traffic handling module (THM) 20 shows a 100 Hz clock interrupt and an 800 Hz clock interrupt, that is, 10 ms and 1.25 ms cycles. Since the interrupt is provided, all 20 ms of time can be divided into 16 time pieces as shown in FIG. 4, and each time piece is allocated to the frame transmission time of each transport channel. Thus, the 800 Hz clock interrupt service routine determines which time slice of the time slice represented in FIG. 4 is to trigger the transmission of a delivery channel frame assigned to that time slice. The appropriate time slice to allocate for each transport channel is determined using T1, T2, DOFF, LTOA, TOAWS, TOAWE, and so on.

Third, the calculation process of CFN to be attached to each transmission channel frame is as follows.

5 shows a CFN to which a radio transceiver subsystem (RTS) 50 will attach to a delivery channel frame in the traffic handling module (THM) 20 and the reception latency interval 12 for a delivery channel frame with a CFN of N (13). The equation for calculating the system time conversion factor (rfn2Cfn), which is used to simplify the calculation, is shown. However, in FIG. 5, "23,33,43,53,63,73" and the following Equations 2 to 7 are values increasing by 1 at 0.125 ms, that is, values in 0.125 ms units. "13" is a value increasing by 1 in 10 ms, that is, a value in 10 ms units.

RFN is the value of the frame counter commonly used by all subsystems and modules in the radio network controller (RNC) 10, and SFN is the frame counter commonly used in one cell of the radio transceiver subsystem (RTS) 50. These frame counter values are all 10 ms units and cycle from "0" to "4095". However, RFN and SFN can be expressed as a non-integer value by indicating the instantaneous value as a purpose of referring to a specific moment. Therefore, by converting to an integer value of 0.125ms by multiplying by 80 in the following equation use. CFN is a frame counter value used independently for a call, used as a frame number of a radio traffic frame, and has a deviation from SFN by the DOFF (32) value assigned by the call control processor 30, and is a value in 10 ms units. Cycles from 0 "to" 255 ". In all the following equations, CFN is converted to a value of 0.125ms unit by multiplying 80 and used.

In FIG. 5, the reception waiting time interval 12 of the frame whose CFN is N (13) is from the point s (23) to the point e (33). That is, a frame in which N (13) is attached to CFN is transmitted when RFN is rfnTx 43 and arrives when SFN of radio transceiver subsystem (RTS) 20 is sfnRx 53. The frame then stays in the radio transceiver subsystem (RTS) 20 for rtsProcTime 63 and undergoes processing in the radio transceiver subsystem (RTS) 20 and then the SFN becomes sfnTx 73, i.e. It is transmitted wirelessly when the CFN of the call becomes N (13). Every frame is individually assigned a wait time interval 12 for that frame only, so when the traffic handling module (THM) 20 creates a forwarding channel frame and calculates the CFN to be attached to that frame, the point in time at which this frame is transmitted It should be possible to estimate the SFN at the time of arriving at the radio transceiver subsystem (RTS) 50 from the RFN, and it should be possible to calculate which CFN this frame should have through the relationship shown in FIG.

Therefore, in the present invention, a system time transition factor of rfn2Cfn is defined as a CFN to be attached to a frame to be transmitted when the RFN is "0", and is used as an RFN at the time of transmitting a frame as shown in Equation 1 below. Simply add rfn2Cfn to calculate the CFN of the frame.

cfn = (rfn + rfn2Cfn)% (256 * 80)

In Equation (1), cfn is a CFN attached to a frame transmitted when the RFN is rfn, and a modulo operation of (256 * 80) is performed on the sum of rfn and rfn2Cfn plus CFN at "0". This is because the number circulates up to "255", and cfn, rfn, and rfn2Cfn are all 0.125 ms units.

The method for obtaining such rfn2Cfn will be described in more detail.

In FIG. 5, a frame with CFN N 13 is transmitted from the traffic handling module 20 at the time RFN is rfnTx 43 and the radio transceiver subsystem (RTS) 50 at the time SFN is sfnRx 53. To arrive. Since this frame stays in the wireless transceiver subsystem (RTS) 20 for rtsProcTime (63) and then is transmitted wirelessly at the time when the SFN becomes sfnTx (73), sfnRx (53) is expressed as Equation 2 below. do.

Since sfnTx 73 is the SFN value at the moment when CFN is N (13), it is expressed as below (Equation 3).

sfnTx = (N * 80) + DOFF

In addition, in the present invention, sfnRx 53 is located at the center between the points s (23) and e (33), which are reception waiting time intervals 12, so that rtsProcTime (63) is expressed by Equation 4 below. Indicates.

The rfnTx 43 is represented by the following formula (5) when the difference between the rfnTx 43 and T1 is the same as the difference between the sfnRx 53 and T2.

rfnTx = sfnRx-T1 + T2

By definition, rfn2Cfn is a CFN to be attached to a frame to be transmitted when RFN is "0", and this value is expressed using N (13) and rfnTx (43) of FIG. Equation 6).

rfn2Cfn = (N * 80)-rfnTx

Accordingly, rfn2Cfn, which is a system time conversion factor, may be expressed as in Equation 7 below using Equations 2 to 6.

(4096 * 80) is added in (Equation 7) and modulated by (4096 * 80) because rfn2Cfn must be positive in order to apply rfn2Cfn to (Equation 1).

Finally, a description will be given of a method of restoring synchronization when the transmission channel is out of sync.

Each time the traffic handling module (THM) 20 constructs a traffic frame, the CFN of the frame can be simply calculated using rfn2Cfn calculated by the above method and the equation (1). Can be. However, if the CFN calculated by the above method becomes inadequate due to a change in the load on the radio access network (RAN) 60 during the service, i.e., the reception waiting time interval 12 in which the transmission channel frame is set for the frame. You may not be able to get there. In this way, when the transmission channel is out of sync, the radio transceiver subsystem (RTS) 50 determines how far out of time this frame has arrived for the set reception latency interval 12. Will be notified). Then, the traffic handling module (THM) 20 changes the transmission time point for the frame of the corresponding transmission channel to another time slice by using the value informed from the radio transceiver subsystem (RTS) 50, and changes the transmission time point. Change rfn2Cfn as much.

For example, assuming that a frame arrives later than the end point of the reception wait time interval 12 and the transmission time should be changed accordingly, the width to be changed is 5 ms. In FIG. 4, the size of the time slice is 1.25 ms. Therefore, the transmission time is changed from the previous transmission time slice to four preceding time slices, and the value of rfn2Cfn is 0.125ms, so 40 is added. In this way, when the transmission channel is out of synchronization, synchronization can be quickly restored without the necessity of renewing the node synchronization operation between the radio transceiver subsystem (RTS) 50 and the traffic handling module (THM) 20.

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 clear to those of ordinary knowledge.

The present invention as described above, T1, T2 value obtained through the node synchronization operation between the radio network controller (RNC) and the radio transceiver subsystem (RTS) implemented by the traffic handling module (THM) of the radio network controller when the call is established and By using DOFF, LTOA, TOAWS, and TOAWE values, which are received from the call control processor, the system time conversion factor for calculating the CFN of the frame to be sent in the current system time of the RNC is obtained. When constructing a frame to be sent to the radio transceiver subsystem (RTS), it is possible to simply calculate the CFN of the frame by adding the time at which the frame is to be transmitted and this system time conversion factor, If synchronization is out of sync due to change, etc., the synchronization is out of sync without the need for a new node synchronization operation between the RNC and the RTS. As long as the conversion factor by changing the system time by simply recovering the synchronization channel transmission it is effective to improve the quality of service.

Claims (6)

A method of maintaining frame synchronization between a control station and a base station in a wireless communication system, The system uses the information obtained through the node synchronization operation between the control station and the base station performed by the traffic handling module of the control station and the transmission channel synchronization related information received when the call is set up by the call control processor of the control station. Obtaining a time conversion factor; When constructing a frame in the traffic handling module, a second step of calculating a frame number (CFN) of the frame by adding a time to transmit a frame and the system time conversion factor; And A third step of maintaining frame synchronization by changing the system time switching factor by the amount of synchronization out of sync when the control station and the base station are out of sync; Frame synchronization maintaining method between the control station and the base station in a wireless communication system comprising a. The method of claim 1, The information obtained through the node synchronization operation is Substantially, the system time (T1) information of the control station at the time of transmitting the synchronization control frame obtained by the node synchronization between the control station and the base station, and the time (T2) information at which the synchronization control frame carrying the T1 information arrived. Frame synchronization maintaining method between the control station and the base station in a wireless communication system comprising a. The method of claim 1, The transmission channel synchronization related information, Substantially, DOFF (Default Dedicated Physical Channel Offset Value), LTOA (Latest Time of Arrival), Time of Arrival Window Startpoint (TOAWS), and Time of Arrival Window Endpoint (TOAWE) information received from the call control processor. A frame synchronization maintaining method between a control station and a base station in a wireless communication system, characterized in that. The method according to any one of claims 1 to 3, The system time conversion factor is Substantially, a frame number (CFN) for calculating a frame number (CFN) of a frame to be sent in the current system time of the control station, characterized in that the frame synchronization maintaining method between the control station and the base station. The method according to any one of claims 1 to 3, The system time conversion factor is Defined as the frame number (CFN) to be attached to the frame to be transmitted when the frame counter value (RFN) used as the system time of the control station is zero ("0"), and the T1 information, the T2 information, the DOFF And LTOA, TOAWS, and TOAWE information, the method of maintaining frame synchronization between a control station and a base station in a wireless communication system. In order to maintain frame synchronization between the control station and the base station, in a wireless communication system having a processor, The system uses the information obtained through the node synchronization operation between the control station and the base station performed by the traffic handling module of the control station and the transmission channel synchronization related information received when the call is set up by the call control processor of the control station. A first function of obtaining a time conversion factor; A second function of calculating a frame number (CFN) of a corresponding frame by adding a time to transmit a frame and the system time conversion factor when configuring a frame in the traffic handling module; And A third function of maintaining frame synchronization by changing the system time switching factor by an amount of synchronization out of synchronization when the frame synchronization is out of synchronization between the control station and the base station; A computer-readable recording medium having recorded thereon a program for realizing this.