JP4139716B2 - Radio base station and phase adjustment method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a radio base station constituting a mobile communication system, and more particularly to a radio base station that adjusts the phase of data transmitted to and received from a radio base station controller.
[0002]
[Prior art]
Hereinafter, a phase adjustment method in a conventional mobile communication system will be described. FIG. 5 is a diagram illustrating data transmission / reception and phase adjustment between the radio base station and the radio base station controller described in Non-Patent Document 1. The horizontal direction shows the flow of time. Here, as an example, when the radio base station receives data 101A transmitted from the radio base station control apparatus through the reception window 102A, receives data 101B through the reception window 102B, and receives data 101C through the reception window 102C. Is assumed. Here, the reception window is a time interval in which the radio base station on the receiving side can process the reception data, and reception data that does not enter the reception window is discarded.
[0003]
First, in the radio base station control device, a timing value: 122 is assigned to the data 101A and transmitted so that the radio base station can receive within the reception window 102A. Then, as shown in FIG. 5, since the data 101A can be normally received in the reception window 102A, the radio base station transmits the data 101A to the mobile device via the radio line.
[0004]
Next, in the radio base station control device, a timing value (time during which data can be transmitted between the radio base station control device and the base station): 126 is set to the data 101B so that the radio base station can receive within the reception window 102B. Give it to and send it. However, as shown in FIG. 5, the radio base station may not be able to receive data within the reception window 102B due to transmission path propagation delay and fluctuation, transmission processing delay in the radio base station controller, and the like. In this case, the radio base station discards the received data 101B and assigns the phase adjustment value: 3 indicating the phase difference 103B to the phase adjustment data 104B and transmits it to the radio base station control apparatus.
[0005]
Next, the radio base station control apparatus corrects the phase of the transmission data using the phase adjustment value: 3 given to the phase adjustment data 104B. As a result, the transmission data after correction becomes a timing value 137 obtained by adding the phase adjustment value 3 to the timing value 134 before correction. Therefore, in the radio base station control device, the timing value 137 is assigned to the data 101C and transmitted so that the radio base station can receive within the reception window 102C. Then, as shown in FIG. 5, since the data 101C can be normally received in the reception window 102C, the radio base station transmits the data 101C to the mobile device via the radio line. Although it is necessary to retransmit the discarded data 101B, the description thereof is omitted because it is not related to the present invention.
[0006]
The phase adjustment method as described above, for example, is a system using a transmission path with a small delay fluctuation such as an ATM dedicated line, and obtains good communication quality.
[0007]
[Non-Patent Document 1]
3GPP specification TS25.402 (FIGS. 10, 11, and 12)
[0008]
[Problems to be solved by the invention]
However, for example, in a transmission line with a large delay fluctuation such as a wide area Internet network, phase adjustment is frequently performed between the radio base station and the radio base station control device, so that data received at the base station is frequently discarded. However, there is a problem that data cannot be transmitted to the mobile device, which deteriorates communication quality.
[0009]
Here, the above problem will be specifically described. FIG. 6 is a diagram illustrating problems in data transmission / reception and phase adjustment between the radio base station and the radio base station control device. Similarly to the above, it is assumed that the radio base station receives data 101A transmitted from the radio base station control apparatus through the reception window 102A, receives data 101B through the reception window 102B, and receives data 101C through the reception window 102C. . Here, only processing different from FIG. 5 will be described.
[0010]
For example, in the radio base station control device, the phase of the transmission signal is corrected using the phase adjustment value: 3 given to the phase adjustment data 104B as described above. Then, the data 101C with the corrected timing value 137 is transmitted to the radio base station. However, as shown in FIG. 6, when the propagation delay and fluctuation of the transmission path and the transmission processing delay in the radio base station controller further vary, the radio base station receives the data 101C within the reception window 102C. Can not do it. Accordingly, the wireless base station discards the data 101C following the data 101B.
[0011]
As described above, when communication is performed on a transmission path in which propagation delay and fluctuation fluctuate, or when there is a transmission processing delay in the radio base station controller, the data transmitted from the radio base station controller is transmitted to the radio base station. In this case, data is no longer transmitted to the mobile device.
[0012]
The present invention has been made in view of the above, and by improving the phase adjustment method between the radio base station and the radio base station controller, the number of phase adjustments frequently performed in the prior art can be reduced. It is an object of the present invention to obtain a mobile communication system capable of reducing and improving communication quality.
[0013]
[Means for Solving the Problems]
In order to solve the above-described problems and achieve the object, the radio base station according to the present invention is a radio base station connected to the radio base station control device through a wired transmission path, and the radio base station A receiving window setting means for setting a receiving window for receiving data to be transmitted to the mobile device by the control device; data received at a position other than the receiving window; and storage information relating to the received data is a predetermined condition Reception window processing means for performing control for notifying the radio base station control device of phase adjustment information indicating a phase difference from the reception window.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of a mobile communication system according to the present invention will be described below in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.
[0015]
Embodiment 1 FIG.
FIG. 1 is a diagram showing a configuration of a radio base station according to the present invention. The radio base station 1 includes a radio transmission path interface unit 11 that transmits and receives radio waves on a radio transmission path, a radio signal processing unit 12 that performs baseband signal processing, and information necessary for reception window processing (a reception window and the number of reception times). Reception window setting unit 13 for setting thresholds and reception timer threshold values), reception window processing unit 14 for performing processing based on information from reception window setting unit 13, and layer 2 received from the wired transmission path It comprises a wired signal processing unit 15 that terminates the above and a wired transmission path interface unit 16 that terminates layer 1 of the wired transmission path. Note that, as a configuration of the entire mobile communication system, for example, the mobile device communicates with other terminals via the radio base station 1, the radio base station control device 2, and the mobile network.
[0016]
The wired transmission path interface unit 16 receives the data transmitted by the radio base station control device 2 via the wired transmission path and terminates the layer 1. The wired signal processing unit 15 receives data from the wired transmission path interface unit 16 and terminates layers 2 and above. The reception window processing unit 14 determines whether data is in the reception window based on information set in advance by the reception window setting unit 13. When the data is in the reception window, the wireless signal processing unit 12 performs baseband signal processing on the received data. Then, the wireless transmission path interface unit 11 transmits the signal after the baseband signal processing to the mobile device. If the data does not enter the reception window, the reception data is discarded as in the conventional technique. On the other hand, unlike the conventional technique, the reception window processing unit 14 until the predetermined condition is satisfied, The phase adjustment data is not transmitted to the radio base station controller 2. That is, when a predetermined condition is satisfied, the reception window processing unit 14 adds a phase adjustment value indicating a phase difference from the reception window to the phase adjustment data and transmits the phase adjustment data to the radio base station control device 2.
[0017]
FIG. 2 is a diagram illustrating a management table used in the processing of the reception window processing unit 14. This management table includes the received data identifier of received data, the reception frequency threshold indicating the threshold of the number of times the reception window has been continuously shifted, and the timeout threshold of the timer that is periodically started when no data is received. Corresponding reception timer threshold indicating value, number of receptions indicating the number of times the reception window has been continuously shifted, and reception timer indicating a timeout of a timer periodically started when no data is received, to each received data identifier unit Manage. The received data identifier is expressed by a simple identifier (100, 200...) For the sake of simplicity of this description. However, the present invention is not limited to this, and any identifier can be used as long as it can identify data. May be used. For example, it may be a VCI / CID value such as an ATM line, or may be an IP address or port number such as an Ethernet (registered trademark) line.
[0018]
Here, the operation of the reception window processing unit 14 which is a feature of the present invention will be described. FIG. 3 is a diagram illustrating a processing flow of the reception window processing unit 14.
[0019]
When receiving data (step S1), the reception window processing unit 14 searches the management table shown in FIG. 2 for an identifier corresponding to the identifier of the received data (step S2). Then, it is determined whether the received data is in the receiving window (step S3). For example, if the received data is in the reception window (S3, No), the reception timer shown in FIG. 2 corresponding to the identifier is reset (step S4), and the number of receptions is further reset (step S5). Exit. The received data identifier: 100 received data in FIG. 2 corresponds to this.
[0020]
On the other hand, if the received data does not enter the reception window (step S3, Yes), it is determined whether the timer is being activated (step S6). At this time, if the timer is not being activated (step S6, No), the timer is activated (step S7).
[0021]
Next, when the timer is started (step S6, Yes), the number of receptions shown in FIG. 2 corresponding to the identifier is incremented (1 is added) (step S8). Then, it is determined whether the number of receptions after addition exceeds the corresponding reception number threshold (step S9). When the number of receptions after the addition exceeds the reception number threshold (Yes in step S9), the radio base station control device adds phase adjustment values indicating the phase difference from the reception window to the phase adjustment data. 2) (step S10), and the process ends. The received data identifier: 200 in FIG. 2 corresponds to this. If the number of receptions after the addition does not exceed the reception number threshold (No at Step S9), the process ends in that state. The received data identifier: 300 in FIG. 2 corresponds to this.
[0022]
Further, when the activated timer times out (step S11), the reception window processing unit 14 searches for a reception data identifier that has timed out from the management table shown in FIG. 2 (step S12).
[0023]
Next, the timeout value at that time is added as a reception timer corresponding to the identifier (step S13). Then, it is determined whether the added reception timer exceeds the corresponding reception timer threshold value (step S14). When the reception timer after the addition exceeds the reception timer threshold value (Yes at Step S14), the reception timer after the addition is reset (Step S15), the number of receptions is reset (Step S16), and the process is terminated. . Further, when the reception timer after the addition does not exceed the reception timer threshold value (No in step S14), the process is terminated in that state.
[0024]
FIG. 4 is a diagram illustrating data transmission / reception and phase adjustment between the radio base station 1 and the radio base station control device 2 in the present embodiment. The horizontal direction shows the flow of time. Here, as an example, the radio base station 1 receives the data 101A transmitted from the radio base station controller 2 through the reception window 102A, receives the data 101B through the reception window 102B, and receives the data 101C through the reception window 102C. Assume that
[0025]
First, the radio base station control device 2 transmits the data 101A with a timing value of 122 so that the radio base station 1 can receive within the reception window 102A. Then, as shown in FIG. 4, since the wireless base station 1 has successfully received the data 101A within the receiving window 102A, the wireless base station 1 transmits the data 101A to the mobile device via the wireless line.
[0026]
Next, the radio base station control device 2 transmits the data 101B with a timing value of 126 so that the radio base station 1 can receive within the reception window 102B. However, the radio base station 1 cannot receive within the reception window 102B due to the propagation delay and fluctuation of the wired transmission path, the transmission processing delay in the radio base station controller 2, etc. (phase difference 103B) as shown in FIG. There is. In this case, the radio base station 1 discards the received data 101B. On the other hand, in the present embodiment, unlike the prior art, phase adjustment data is not transmitted to the radio base station controller. That is, here, the radio base station control device 2 does not perform the correction process. In the present embodiment, when a predetermined condition is satisfied, a phase adjustment value indicating a phase difference from the reception window is added to the phase adjustment data and transmitted to the radio base station control apparatus 2.
[0027]
Next, in the radio base station control device 2, a timing value: 134 is assigned to the data 101C and transmitted so that the radio base station 1 can receive within the reception window 102C. Then, as shown in FIG. 4, since the radio base station 1 has successfully received the data 101C within the reception window 102C, the data 101C is transmitted to the mobile device via the radio line.
[0028]
Thus, in this Embodiment, it was set as the structure which a radio base station performs phase adjustment between a radio base station and a radio base station control apparatus. Also, as in the prior art, the phase adjustment is not performed every time the reception window shifts, but a predetermined threshold is provided, and the phase adjustment is performed when the number of receptions exceeds the threshold. did. Also, a reception timer threshold is provided, and when the reception timer corresponding to specific reception data exceeds the threshold, the number of receptions corresponding to the reception data is reset. As a result, communication quality can be improved with fewer exchanges than before.
[0029]
【The invention's effect】
As described above, according to the present invention, the radio base station performs phase adjustment between the radio base station and the radio base station control device. In addition, the phase adjustment is not performed every time the reception window shifts as in the prior art, but the phase adjustment is performed when the number of times data is continuously received at a position other than the reception window exceeds a predetermined threshold. It was decided to do. In addition, when the sum of the timeout values of the timers corresponding to specific received data exceeds a predetermined threshold, the “number of times data is continuously received at a position other than the reception window” corresponding to the received data is displayed. It was decided to reset. As a result, there is an effect that communication quality can be improved with fewer exchanges than before.
[Brief description of the drawings]
FIG. 1 is a diagram showing a configuration of a radio base station according to the present invention.
FIG. 2 is a diagram showing a management table used in processing of a reception window processing unit.
FIG. 3 is a diagram illustrating a processing flow of a reception window processing unit.
FIG. 4 is a diagram illustrating data transmission / reception and phase adjustment between a radio base station and a radio base station control apparatus according to the present invention.
FIG. 5 is a diagram illustrating data transmission / reception and phase adjustment between a radio base station and a radio base station control device in the prior art.
FIG. 6 is a diagram illustrating problems in data transmission / reception and phase adjustment between a radio base station and a radio base station controller.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Wireless base station, 2 Wireless base station control apparatus, 11 Wireless transmission line interface part, 12 Wireless signal processing part, 13 Reception window setting part, 14 Reception window processing part, 15 Wired signal processing part, 16 Wired transmission line interface part

Claims (2)

In the wireless base station connected to the wireless base station controller by a wired transmission path,
A reception window setting means for setting a reception window for receiving data transmitted by the radio base station controller to a mobile device;
When data is received at a position other than the reception window and the accumulated information related to the reception data satisfies a predetermined condition, phase adjustment information indicating a phase difference from the reception window is notified to the radio base station controller. Receiving window processing means for performing control for,
Equipped with a,
The reception window processing means includes:
Identification information for identifying received data, continuous number of times when data is continuously received at a position other than the reception window, threshold of the continuous number of times, total of timeout values of timers that are started when no data is received, And a management means for managing the threshold value of the timeout value as the accumulated information in association with each identification information,
With
When receiving data in the reception window, reset the timeout value and the continuous count corresponding to the identification information of the received data,
On the other hand, when data is received at a position other than the reception window and the timer is activated or a new timer is activated, the continuous number corresponding to the identification information of the received data is incremented, and the continuous number after the increment Performs control to notify the radio base station controller of the phase adjustment information at a stage where the corresponding threshold is exceeded,
further,
When the running timer times out, the time-out value at that time is added to the sum of the time-out values corresponding to the identification information of the time-out received data, and the threshold value corresponding to the sum of the time-out values after the addition is added. A radio base station characterized by resetting the sum of timeout values after the addition and the corresponding number of consecutive times when the number is exceeded . A phase adjustment method that can be executed by a radio base station connected to the radio base station control device via a wired transmission path,
A reception window setting step for setting a reception window for receiving data transmitted by the radio base station controller to a mobile device;
Identification information for identifying received data, continuous number of times when data is continuously received at a position other than the reception window, threshold of the continuous number of times, total of timeout values of timers that are started when no data is received, And a management step of managing the threshold value of the timeout value as the accumulated information in association with each identification information,
When data is received at a position other than the reception window and the accumulated information related to the reception data satisfies a predetermined condition, the phase difference from the reception window is determined based on the information managed in the management step. Receiving window processing step for performing control for notifying the radio base station controller of phase adjustment information indicating:
Only including,
In the reception window processing step,
A search step of searching for identification information corresponding to received data from the information managed in the management step;
When receiving data in the receiving window, an initialization step for resetting the timeout value and the continuous count corresponding to the detected identification information;
When the data is received at a position other than the reception window and the timer is activated or a new timer is activated, an increment step for incrementing the continuous number of times corresponding to the detected identification information;
It is determined whether the number of consecutive times after the increment exceeds a corresponding threshold value.If the threshold value is exceeded, the phase adjustment information is notified to the radio base station controller, If the threshold is not exceeded, a phase adjustment step that maintains that state;
A time-out data search step for searching for identification information corresponding to received data timed out from the information managed in the management step when a running timer times out;
An addition step of adding the timeout value at that time to the total timeout value corresponding to the detected identification information;
It is determined whether or not the sum of the timeout values after the addition exceeds the corresponding threshold value, and if the threshold value is exceeded, the sum of the timeout values after the addition and the corresponding consecutive times are reset. On the other hand, if the threshold is not exceeded, a timeout determination step for maintaining the state;
Phase adjustment method characterized by including the.

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