[Document Name] DESCRIPTION
[Title of Invention] WIRELESS CONTROL SYSTEM, AND METHOD FOR
MONITORING WIRELESS LINK ERROR
[Technical Field]
5 [0001]
10
The present invention relates to a wireless control system and a
method for monitoring a wireless link error.
[Background Art]
[0002]
CPRI (Common Public Radio Interface) is an interface for
connecting a wireless control device (REC: Radio Equipment Control) and
a wireless device (RE: Radio Equipment) in a wireless base station.
[0003]
It IS a key factor in the communication quality management of
15 wireless base stations that communication quality of a physical layer of
CPRI can be monitored on the wireless control device side.
[0004]
PTL 1 discloses a technique of notifying a desynchronized state by
inserting a command code, which is different according to whether a
20 wireless control device and a wireless device are in a synchronized or
desynchronized state, into a command byte indicating the start of a
hyperframe that is a unit of CPRI signals.
[0005]
PTL 2 discloses vanous advantages of the CPRI interface for
25 communicating between a wireless control device and a wireless device in
a wireless base station.
[Citation List]
[Patent Literature]
[0006]
2
[PTL 1] Japanese Unexamined Patent Application Publication No.
2012-217134
[PTL 2] Japanese Unexamined Patent Application Publication (Translation
of PCT International Application) No. 2007-507957
5 [Summary of Invention]
[Technical Problem]
[0007]
CPRI cannot control retransmission on a physical layer due to the
nature thereof when an error occurs in a CPRI link. Therefore, it is
10 necessary to have a state where communication quality of the physical
layer of the CPRI link can be monitored on a wireless control device side.
[0008]
For example, there are specifications for abnormality monitoring on
a physical layer in "CPRI Specification V6.0". In the specification,
15 specifications for notifying a device on the opposite side of a link state
using the Z.130.0 region such as LOS (Loss Of Signal), LOF (Loss Of
Frame), and the like, are used.
[0009]
In PTL 1, only information indicating a synchronized state is added
20 to LOS and LOF information embedded in a hyperframe.
[0010]
25
PTL 2 describes only general features for CPRI including
above-mentioned LOS and LOF.
[00 11]
The LOS and LOF information is only the information indicating
whether communication quality is better or worse than a certain given level.
Therefore, even if an error in a CPRI link is determined using
specifications for LOS and LOF, a wireless control device cannot
sufficiently monitor communication quality.
3
[0012]
Also, the specifications for LOS and LOF have a limitation on the
data amount of information notifying a link state. Thus, a wireless
device does not notify a device on the opposite side in a case of a low
5 frequency of abnormality occurrences and also cannot notify a frequency
when the limitation in a case of a high frequency of abnormality
occurrences is reached.
[00 13]
Furthermore, there is a problem that it is difficult to identify a
10 malfunction part when an abnormality occurs in a CPRI link. A wireless
device often generates an UL (Up Link) CPRI signal to a wireless control
device using a clock extracted from a DL (Down Link) CPRI signal.
Therefore, it is difficult to identify a malfunction part when local LOS or
local LOF occurs in a signal received on the wireless control ·device side.
15 This is because the wireless control device cannot determine whether the
wireless device transmits an abnormal UL CPRI signal caused by an
abnormality of the DL CPRI signal transmitted from the wireless control
device or the UL CPRI signal is abnormal due to the wireless device side.
[00 14]
20 Thus, an object of the present invention is to provide a wireless
control system and a method for monitoring a wireless link error, which
enable the wireless control device side to check a detailed error occurrence
state in each CPRI link.
[Solution to Problem]
25 [00 15]
A wireless device in one aspect of the present invention stores an
error occurrence state in a wireless link in a region that can be freely used
by a user in the wireless link and transmits the error occurrence state.
[00 16]
4
A method for monitoring a wireless link error in the present
invention comprises storing an error occurrence state in a wireless link in a
region that can be freely used by a user in the wireless link; and
transmitting the error occurrence state.
5 [Advantageous Effects of Invention]
[00 1 7]
According to the present invention, a detailed error occurrence
state in each CPRI link can be checked on a wireless control device side.
[Brief Description of Drawings]
10 [0018]
15
Fig. 1 is a block diagram showing one example of a configuration of
a wireless control system according to a first example embodiment.
Fig. 2 is a diagram showing one example of CPRI data mapping in a
CPRI link.
Fig. 3 is a block diagram of a transmission unit and a reception unit
of a wireless control device or a wireless device.
Fig. 4 is a diagram conceptually showing one example of an
operation of a wireless device 11 2 11
•
Fig. 5 is a diagram conceptually showing one example of an
20 operation of a wireless device 11 1 11
•
Fig. 6 is a diagram conceptually showing one example of an
operation of the wireless control device.
Fig. 7 is a diagram showing examples of a link number of a wireless
control system according to a second example embodiment.
25 Fig. 8 is a diagram conceptually showing one example of an
operation of a wireless device 11 2" according to the second example
embodiment.
Fig. 9 ts a diagram conceptually showing one example of an
operation of a wireless device 11 1" according to the second example
5
embodiment.
Fig. 10 is a diagram conceptually showing one example of an
operation of a wireless control device according to the second example
embodiment.
5 Fig. 11 is a block diagram showing one example of a configuration
of a wireless device according to a third example embodiment.
[Description of Embodiments]
[00 19]

10 A first embodiment for executing the invention ts explained 1n
detail with reference to the drawings.
[0020]
Fig. 1 is a block diagram showing one example of a configuration of
a wireless control system 10 according to a first example embodiment.
15 [0021]
A wireless control system 10 includes a wireless control device 20,
a wireless device "1" 3 OA, a wireless device "2" 3 OB, a CPRI link "1" 40,
and a CPRI link "2" 50. The wireless control system 10 is, for example, a
wireless base station.
20 [0022]
The wireless control device 20 connects to and controls the wireless
device "1" 30A and the wireless device "2" 30B. The wireless device "1"
3 OA and the wireless device "2" 3 OB are also referred to as wireless
devices 3 0 when being called collectively or without specifying them.
25 [0023]
The wireless devices 3 0 process wireless signals.
[0024]
It is noted that a case where the number of the wireless devices 3 0
is two is described in the present example embodiment, but the number of
6
the wireless devices 30 may be any number of one or more.
[0025]
Also, the wireless control system 10 in the present example
embodiment shows an example in "a chain topology", in which the wireless
5 control device 20 is connected to the wireless device "2" 3 OB through the
wireless device "1" 3 OA as shown in Fig. 1. It is noted that the wireless
control system 10 may have a configuration of "a star topology", in which
a plurality of wireless devices 30 are directly connected to the wireless
control device 20, a combination of a plurality of connection forms, or the
10 like. However, even in these configurations, functions of the wireless
control device 20 and the wireless devices 30 are the same as the functions
in the present example embodiment.
[0026]
The CPRI link "1" 40 connects the wireless control device 20 and
'
15 the wireless device "1" 30A. The CPRI link "2" 50 connects the wireless
device "1" 30A and the wireless device "2" 30B. The CPRI link "1" 40
and the CPRI link "2" 50 are CPRI interfaces.
[0027]
Transmission units 21, 31 A and 31 B of the wireless control device
20 20, the wireless device "1" 30A and the wireless device "2" 30B
respectively transmit a CPRI signal.
[0028]
Also, reception units 22, 32A and 32B of the wireless control
device 20, the wireless device "1" 3 OA and the wireless device "2" 3 OB
25 respectively receive a CPRI signal.
l 0029 J
Detailed configurations of the transmission units 21, 31 A and 31 B,
and the reception units 22, 32A and 32B will be explained in Fig. 3
described below.
7
[0030]
Data of the CPRI links (the CPRI link "1" 40 and the CPRI link "2"
50), which is hereinafter referred to as CPRI data, is composed of
hyperframes. Further, the hyperframes have a hierarchical structure
5 composed of basic frames (1 hyperframe = 256 basic frames).
[0031]
Also, the basic frames are managed by taking data of 8 bits x 16
words as a data unit and using a line number Y corresponding to the data
unit, for example, managed with values of YO to Y3 (in a case of Y = 4
10 lines).
[0032]
A communication bit rate at the CPRI links is, for example, 2457.6
M bits/s (in a case of 614.4 M bits/s x Y, wherein Y = 4 ). Also, in this
case, one hyperframe is composed of 163 84 byte data (= 4 x 16 words x
15 256 basic frames).
[003 3]
Fig. 2 is a diagram showing one example of CPRI data mapping in a
CPRI link. This means that Fig. 2 shows a data structure In one
hyperframe. One hyperframe is composed of 256 ba,sic frames.
20 [0034]
In the explanation below, "#Z.X. Y" represents an address of data in
a hyperframe. In this explanation, X represents an index of a basic frame
(corresponding to each number in Fig. 2) and is a value from 0 to 255.
Also, Y represents a line number within each data of a basic frame (refer to
25 the line number Y above) and is a value from 0 to 3. In addition, Z
represents an index of a hyperframe itself and is a value, for example, from
0 to 149.
[0035]
Also, Xs (the value is 0 to 3) shown in Fig. 2 has a relation to the
8
/'
aforementioned X as shown in the following equation ( 1):
X= Ns + 64 x Xs (1)
wherein Ns is the number of items (the number of lines) corresponding to
"TYPE" in Fig. 2.
5 [003 6]
10
It is noted that the notation, such as "#Z.Xl.Y1 to #Z.X2.Y2", used
tn the explanation below means CPRI data whose range is shown by the
address of "#Z.X1.Y1" to "#Z.X2.Y2".
[003 7]
Now, in Fig. 2, a "vender specific" region that the wireless control
system 10 in the present example embodiment uses in the CPRI link is
shown in the lower area in the drawing and enclosed by a thick frame.
The "vender specific" region is one example of regions that a user can
freely use and the present example embodiment is characterized by storing
15 obtained error information in this region. It is noted that at least 16
control words (the aforementioned Ns = 16 to 19) are secured as a "vender
specific" region in the current "CPRI Specification V6.0". In the present
example embodiment, using any "vender specific" region does not make a
difference on effects.
20 [003 8]
The wireless control system 10 in the present example embodiment
can notify the side of the wireless control device 20 of a detailed error
occurrence state in each CPRI link using the "vender specific" region.
Thus, as a result of abnormality monitoring of physical layers in the CPRI
25 links, the wireless control system 10 can notify a device on the opposite
side (that means, for example, a device on the other side of each of the
wireless control device 20 or the wireless device 30 in terms of
transrnissiun and r~c~ptiun) eve11 111 a case of a low frequency of
abnormality occurrences, or also notify a frequency in a case of a high
frequency of the occurrences.
[003 9]
9
In addition, it is easy to identify a malfunction part because the
wireless control system 10 in the present example embodiment can also
5 store information on an error occurrence part in the "vender specific"
regton.
[0040]
It ts noted that information on LOS and LOF is stored in the
#Z.130.Y region (X= 130 in Fig. 2). Also, explanations of the other
10 regions in Fig. 2 are omitted because of the remote relation to an operation
specific to the present example embodiment.
[0041]
Fig. 3 is a block diagram of transmission units 21 and 31 and
reception units 22 and 32 of the wireless control deyice 20 or the wireless
15 device 30. In Fig. 3, the arrow directions in the drawing show one
example and do not limit directions of signals between the blocks. In this
explanation, the transmission units 31 A and 31 B in Fig. 1 are also called
transmission units 31 when being called collectively or without specifying
them. In addition, the reception units 32A and 3 2B are also called
20 reception units 32 when being called collectively or without specifying
them.
[0042]
It ts noted that an 8B/1 OB process is a high-speed serial transfer
mode for transmitting data by converting 8-bit data into 1 O-bit data. Also,
25 "8B/1 OB violation" means a violation of data communicated in the 8B/1 OB
process.
[0043]
A received CPRI signal 600 received at the reception units 22 and
32 is transmitted to a de serialization circuit 601. At the reception unit 22,
10
the received CPRI signal 600 is a signal from the transmission unit 31A.
At the reception unit 32A, the received CPRI signal 600 is a signal from
the transmission unit 21 or the transmission unit 31 B. Also, at the
reception unit 32B, the received CPRI signal 600 is a signal from the
5 transmission unit 31 A. The de serialization circuit 601 de serializes
(converts from serial to parallel) the received CPRI signal 600. Then, an
8B/ 1 OB decoding circuit 602 performs an 8B/ 1 OB process on deserialized
data and outputs the processed data to a hyperframe detection circuit 603.
[0044]
10 Also, the 8B/1 OB decoding circuit 602 detects an "8B/1 OB
violation" during the 8B/10B process. If the "8B/10B violation" is
detected, the 8B/1 OB decoding circuit 602 generates an 8B/1 OB violation
occurrence notification 604. The 8B/1 OB decoding circuit 602 notifies an
8B/ 1 OB violation count circuit 606 of the 8B/1 OB violation occurrence
15 notification 604 detected during the 8B/1 OB process.
[0045]
Also, the hyperframe detection circuit 603 that receives data
decoded by the 8B/1 OB process at the 8B/1 OB decoding circuit 602 detects
a hyperframe on the basis of a CPRI format. Then, the hyperframe
20 detection circuit 603 notifies the 8B/1 OB violation count circuit 606 of a
timing of the detection (transmitting a hyperframe timing notification
605).
[0046]
The 8B/1 OB violation count circuit 606 that receives the 8B/1 OB
25 violation occurrence notification 604 and the hyperframe timing
notification 605 counts 8B/ 1 OB violations occurring during one hyperframe.
Counting is performed for each hyperframe. A counted value is updated
for each hyperframe. Then, the counted value is notified to a vender
specific insertion circuit 610 on the transmitting side (an 8B/1 OB violation
11
count result notification (simply called a count result notification as well)
607).
[004 7]
In this case, the 8B/1 OB violation count circuit 606 transmits the
5 counted value as the 8B/1 OB violation count result notification 607.
[0048]
If a notification function that uses the vender specific region
according to the present example embodiment is not implemented, the
vender specific insertion circuit 610 inserts the 8B/ 1 OB violation count
10 result notification 607 notified from the 8B/1 OB violation count circuit 606
into a CPRI signal (a CPRI signal 609 before the 8B/1 OB process)
generated at a transmission signal generating circuit 608. This allows the
vender specific insertion circuit 610 to store, for example, lower 8 bits of a
value that is the number of the 8B/1 OB violation occurrences given in
15 binary number in #Z.X.O of a CPRI data address and higher 8 bits of the
value given in binary number in #Z.X.1 of the address respectively. In a
case of a high bit rate, the vender specific insertion circuit 610 can~ further
use #Z.X.2. It is noted that, as shown in Fig. 2, X is any of the values of
16 to 19, 80 to 83, 144 to 147, and 208 to 211 in the vender specific region.
20 Also, the wireless control system 10 can flexibly support various CPRI link
configurations by employing a method of notifying each wireless device 30
of a value of X from a wireless control device 20 on an operation mode
basis.
[0049]
25 Then, the vender specific insertion circuit 610 outputs data into
which the 8B/1 OB violation count result notification 607 is inserted to an
8B/1 OB encoding circuit 611.
[0050]
After this, a CPRI signal output from the vender specific insertion
12
circuit 610 is encoded at the 8B/1 OB encoding circuit 611. Then, the
CPRI signal is further serialized at a serialization circuit 612 and
transmitted to a device on the opposite side as a transmitted CPRI signal
613.
5 [0051]
Fig. 4 is a diagram conceptually showing one example of an
operation of the wireless device "2" 30B. Using Fig. 4, detection and
notification operations of the 8B/ 1 OB violation in the wireless device "2"
30B are explained below. The left side of Fig. 4 shows a detection
10 method. Also, the right side of Fig. 4 shows a notification method.
[0052]
·It IS assumed that the wireless device "2" 30B receives a CPRI
signal as a DL (Down Link) signal from the wireless device "1" 30A
through the CPRI link "2" 50. In this case, the wireless device "2" 30B
15 counts the number of 8B/ 1 OB violation occurrences in a received CPRI
signal for each hyperframe (S 1 ).
[0053]
Then, the wire 1 e s s device "2 " 3 0 B notifies the wire 1 e s s device " 1 "
30A of the counted number of 8B/1 OB violation occurrences using #Z.16.0
20 to #Z.16.1 of an UL (Up Link) signal through the CPR.I link "2" 50. The
notified values are updated by the 8B/1 OB violation count circuit 606 for
each hyperframe (S2).
[0054]
Fig. 5 is a diagram conceptua11y showing one example of an
25 operation of the wireless device 11 111 30A. Using Fig. 5, an operation of
the wireless device "1" 3 OA is explained below. The left side of Fig. 5
shows a detection method. Also, the right side of Fig. 5 shows a
notification method.
[0055]
13
Firstly, the wireless device 11 111 30A counts the number of 8B/10B
violation occurrences in the CPRI signal received as a DL signal from the
wireless control device 20 through the CPRI link 11 111 40 for each
hyperframe (S3 ). Then, the wireless device 11 111 3 OA notifies the wireless
5 control device 20 of the counted number of the 8B/1 OB violation
occurrences using #Z.16.0 to #Z.16.1 of an UL signal through the CPRI
link 11 111 40 (S4 ). The notified value is updated for each hyperframe.
[0056]
Next, the wireless device 11 111 30A counts the number of 8B/10B
10 violation occurrences in the CPRI signal received as the UL signal through
the CPRI link 11 2 11 50 for each hyperframe (S5). Then, the wireless device
11 111 30A notifies the wireless control device 20 of the counted number of
the 8B/1 OB violation occurrences using #Z.17 .0 to #Z.17 .1 of an UL signal
through the CPRI link 11 111 40 (S6). The notified value is updated for each
15 hyperframe.
[0057]
The wireless device 11 111 30A also extracts information of #Z.16.0 to
#Z.16.1 from the CPRI signal transmitted in S2 and received as the UL
signal through the CPRI link 11 2 11 50 (S 7). Next, the wireless device 11 111
20 30A notifies the wireless control device 20 of the extracted information
using #Z.18.0 to #Z.18.1 of an UL signal through CPRI link 11 1" 40 (S8).
The notified value is updated for each hyperframe.
[0058]
Fig. 6 is a diagram conceptually showing one example of an
25 operation of the wireless control device 20. Using Fig. 6, an operation of
the wire1ess control device 20 is explained below. The left side of Fig. 6
shows a detection method. Also, the right side of Fig. 6 shows checkable
information.
[0059]
14
Firstly, the wireless control device 20 receives the CPRI signal
transmitted as the UL signal through the CPRI link "1" 40 in S4 and
extracts the information of #Z.16.0 to #Z.16.1 (S9). This allows the
wireless control device 20 to check the number of the 8B/1 OB violation
5 occurrences in the DL signal through the CPRI link "1" 40 (S 1 0).
[0060]
Next, the wireless control device 20 receives the CPRI signal
transmitted as the UL signal through the CPRI link "1" 40 in S6 and
extracts the information of #Z.1 7. 0 to #Z.1 7.1 (S 11). This allows the
10 wireless control device 20 to check the number of the 8B/1 OB violation
occurrences in the UL signal through the CPRI link "2" 50 (S 12).
[0061]
The wireless. control device 20 also receives the CPRI signal
transmitted as the UL signal through the CPRI link "1" 40 in S8 and
15 extracts the information of #Z.18.0 to #Z.18.1 (S 13 ). This allows the
wireless control device 20 to check the number of the 8B/ 1 OB violation
occurrences in the D L signal through the CPRI link "2" 50 (S 14).
[0062]
Furthermore, the wireless control device 20 counts the number of
20 8B/ 1 OB viol~tion occurrences in the CPRI signal received as the UL signal
through the CPRI link "1" 40 for each hyperframe (S 15). This allows the
wireless control device 20 to check the number of the 8B/ 1 OB violation
occurrences in the UL signal through the CPRI link "1" 40 (S 16).
[0063]
25 In this manner, the wireless control device 20 can check all the
8B/1 OB violation occurrence states in detail for DL/UL through the CPRI
1 ink "1" 40 and the CPR I link "2" 50 by the notification function using the
vender specific region.
[0064]
15
It is noted that the explanation of a simple "chain topology" is
described in the present example embodiment. However, the wireless
control system 10 may be able to have a CPRI link configuration of "a
chain topology", "a star topology", or a combination thereof by assigning a
5 monitored link and a vender specific region for notifying the number of
8B/ 1 OB violation occurrences to each wireless device 3 0 from the wireless
control device 20. In these configurations, the side of the wireless
control device 20 can check the 8B/1 OB violation occurrence state for
DL/UL through each CPRI link in detail.
10 [0065]
The wireless control system 10 according to the present example
embodiment has an effect as described below.
[0066]
It Is possible to check a detailed error occurrence state In each
15 CPRI link on the side of the wireless control device 20.
[0067]
This IS because the wireless device 3 0 stores the error occurrence
state in the CPRI link in the vender specific region of the CPRI link and
transmits the error occurrence state to the wireless control device 20.
20 [0068]

Fig. 7 is a diagram showing examples of a link No. of a wireless
control system 70 (and a block diagram showing one example of a
configuration) according to a second example embodiment. The numbers
25 enclosed in a square in the figure show the examples of CPRI link Nos.
"No." means the number.
[0069]
In the present example embodiment, a wireless control device 80
notifies respective wireless devices 90A and 90B of only a link No.
16
(UL/DL individually) showing a specified part of a monitored CPRI link.
Meanwhile, the wireless devices 90A and 90B notify an upper device (the
wireless control device 80 or the wireless device 90A) of the monitored
link No. using #Z.X.O to #Z.X.1, which are several of the most significant
5 bits, of the vender specific region addresses. The wireless devices 90A
and 90B also notify the upper device (the wireless control device 80 or the
wireless device 90A) of the number of 8B/1 OB violation occurrences using
#Z.X.O to #Z.X.1, namely the rest of the bits. For the number of bits
allocated to a link No., the proper number of bits is set depending on
10 com·plexity of the system configuration.
[0070]
The wireless control system 70 in the present example embodiment
includes the wireless control device 80, a transmission unit 81, a reception
unit 82, a wireless device 11 111 90A, a wireless device 11 2 11 90B, a
15 transmission unit 91 A, a transmission unit 91 B, a reception unit 92A, a
reception unit 92B, a CPRI link 11 111 100, and a CPRI link 11 2" 110. It is
noted that the wireless control system 70 has an equivalent configuration
to the wireless control system 10 shown in Fig. 1 and the transmission
units and the reception units shown in Fig. 3, and detailed explanations of
20 the wireless control system 70 are omitted.
[0071]
Fig. 8 is a diagram conceptually showing one example of an
operation of the wireless device 11 2 11 90B according to the second example
embodiment. lJsing Fig. 8, an operation of the wireless device 11 2 11 90B is
25 explained below. The left side of Fig. 8 shows a detection method.
Also, the right side of Fig. 8 shows a notification method.
[0072]
It is assumed that the wireless device 11 2 11 90B receives a DL signal
from the wireless device 11 1 11 90A through the CPRI link 11 2 11 110. In this
17
case, the wireless device 11 2 11 90B counts the number of 8B/1 OB violation
occurrences in the received CPRI signal for each hyperframe (S 17). Then,
the wireless device 11 2" 90B notifies the wireless device 11 111 90A of the
counted number of the 8B/1 OB violation occurrences and a link No.
5 (notified from the upper device and No. 3 in this case) using any vender
specific region in an UL signal through the CPRI link 11 2 11 110 (S 18). The
notified value is updated for each hyperframe.
[0073]
Fig. 9 is a diagram conceptually showing one example of an
10 operation of the wireless device 11 1" 90A according to the second example
embodiment. Using Fig. 9, an operation of the wireless device "1" 90A is
explained below. The left side of Fig. 9 shows a detection method.
Also, the right side of Fig. 9 shows a notification method.
15
[0074]
Firstly, the wireless device "1 11 90A counts the number of 8B/1 OB
violation occurrences in the CPRI signal received as a DL signal from the
wireless control device 80 through the CPRI link "1" 100 for each
hyperframe (S 19). Then, the wireless device "1" 90A notifies the
wireless control device 80 of the counted number of the 8B/1 OB violation
20 occurrences and a link No. (notified from the upper device and No. 2 in
25
this case) using any vender specific region in an UL signal through the
CPRI link "1" 100 The notified value is updated for each hyperframe
(S20).
[0075]
Next, the wireless device "1" 90A counts the number of 8B/1 OB
violation occurrences in the CPRI signal received as an UL signal through
the CPRI link "2" 110 for each hyperframe (S21 ). Then, the wireless
device "1" 90A notifies the wireless control device 80 of the counted
number of the 8B/1 OB violation occurrences and a link No. (notified from
18
the upper device and No. 4 in this case) using any vender specific region in
an UL signal through the CPRI link "1" 100. The notified value is
updated for each hyperframe (822).
[0076]
5 The wireless device "1" 90A also checks all the vender specific
regions (X: 16 to 19, 80 to 83, 144 to 147,208 to 211) in the CPRI signals
received as UL signals through the CPRI link "2" 110 (823 ). In a case of
this configuration, because information of the link No. 3 inserted by the
wireless device "2" 90B in 818 is detected, the wireless device "1" 90A
10 transfers the information (the link No. 3 and the number of the 8B/1 OB
violation occurrences) to the wireless control device 80 using any vender
specific region in the UL signal through the CPRI link "1" 100. The
wireless device "1" 90A updates a notified value for each hyperframe
(824 ).
15 [0077]
Fig. 10 is a diagram conceptually showing one example of an
operation of the wireless control device 80 according to the second
example embodiment. Using Fig. 10, an operation of the wireless control
device 80 is explained below. The left side of Fig. 10 shows a detection
20 method. Also, the right side of Fig. 10 shows checkable information.
[0078]
Firstly, the wireless control device 80 checks all the vender specific
regions (X: 16 to 19, 80 to 83, 144 to 147, 208 to 211) received as UL
signals through the CPRI link "1" 100 (825). In a case of this
25 configuration, the wireless control device 80 can detect information of the
link Nos. 2, 3, and 4 inserted by the wireless device "1" 90A. This allows
the wireless control device 80 to check the number of 8B/1 OB violation
occurrences in a DL signal through the CPRI link "1" 100 (the link No. 2),
the number of 8B/10B violation occurrences in a DL signal through the
5
19
CPRI link 11 2 11 110 (the link No. 3), and the number of 8B/10B violation
occurrences in an UL signal through the CPRI link 11 2 11 110 (the link No.4)
(S26 to 28).
[0079]
The wireless control device 80 also counts the number of the
8B/ 1 OB violation occurrences in the CPRI signal received as an UL signal
through the CPRI link 11 111 100 for each hyperframe (S29), which allows the
wireless control device 80 to check the number of 8B/1 OB violation
occurrences in the UL signal through the CPRI link 11 111 100 (S30).
10 [0080]
15
This function allows the wireless control device 80 to check the
8B/ 1 OB violation occurrence states for DL/UL through the CPRI link 11 111
100 and the CPRI link 11 2 11 110 in detail.
[0081]
Use of this method enables the wireless control system 70 to check
link Nos. and 8B/10B violation states on the same layer. The wireless
control system 70 can also have an operation mode of reporting to the
upper device only when an 8B/1 OB violation occurs, and in this case,
utilize finite vender specific regions effectively.
20 [0082]
Also, the wireless device 90 may report, as notified information,
not the number of 8B/1 OB violation occurrences to the upper device but
whether the number of 8B/1 OB violation occurrences exceeds a certain
threshold specified by the wireless control device 80 to the upper device.
25 Use of this method enables the wireless control system 70 to simplify
monitoring on the side of the wireless control device 80, also to reduce the
number of bits used for notification, and to utilize finite vender specific
regions effectively.
[0083]
20
The wireless control system 70 according to the present example
embodiment has an effect as described below.
[0084]
It is possible to utilize finite vender specific regions effectively.
5 [0085]
This is because the wireless device 90 notifies the upper device of a
monitored link No. using several of the most significant hits and the
number of 8B/1 OB violation occurrences using the rest of bits.
[0086]
10
Next, a third embodiment for executing the present invention 1s
explained in detail with reference to a drawing.
[0087]
Fig. 11 is a block diagram showing one example of a configuration
15 of a wireless device 120 according to a third example embodiment.
[0088]
The wireless device 120 stores an error occurrence state in a
wireless link 121 in a region that can be freely used by a user in the
wireless link 121 and transmits the error occurrence state.
20 [0089]
The wireless device 120 according to the present example
embodiment has an effect as described below.
[0090]
It is possible to check a detailed error occurrence state 1n the
25 wireless link 121.
[0091]
This 1s because the wireless device 120 stores an error occurrence
state in the wireless link 121 in the region that can be freely used by a user
in the wireless link and transmits the error occurrence state.
21
[0092]
As described above, the example embodiments of the present
invention are explained with reference to the drawings, but the ·present
invention is not limited to the above example embodiments. In the
5 configurations and details of the present invention, various changes that
those skilled in the art could understand can be made within the scope of
the present invention.
[0093]
As described above, the present invention is explained taking the
10 aforementioned example embodiments as typical examples. However, the
present invention is not limited to the example embodiments described
above. This means that various aspects that those skilled in the art could
understand can be applied to the present invention within the scope of the
present invention.
15 [0094]
20
25
This application is based upon and claims the benefit of priority
from Japanese Patent Application No. 2014-191281 filed on September 19,
2014, the disclosure of which is incorporated herein in its entirety by
reference.
[Reference signs List]
[0095]
10 Wireless control system
20 Wireless control device
21 Transmission unit
22 Reception unit
30A Wireless device "1"
30B Wireless device "2"
31A Transmission unit
31B Transmission unit
22
32A Reception unit
32B Reception unit
40 CPRI link "1"
50 CPRI link "2"
5 600 Received CPRI signal
601 Deserialization circuit
602 8B/1 OB decoding circuit
603 Hyperframe detection circuit
604 8B/ 1 OB violation occurrence notification
10 605 Hyperframe timing notification
606 8B/1 OB violation count circuit
607 8B/ 1 OB violation count result notification
608 Transmission signal generating circuit
609 CPRI signal before 8B/1 OB process
15 610 Vender specific insertion circuit
611 8B/1 OB encoding circuit
612 Serialization circuit
613 Transmitted CPRI signal
70 Wireless control system
20 80 Wireless control device
81 Transmission unit
82 Reception unit
90A Wireless device "1"
90B Wireless device "2"
25 91A Transmission unit
91B Transmission unit
92A Reception unit
92B Reception unit
100 CPRI link "1"
23
11 0 CPRI link "2"
120 Wireless device
121 Wireless link

[Document Name] CLAIMS
[Claim 1]
A wireless device which stores an error occurrence state in a
wireless link in a region that can be freely used by a user in the wireless
5 link and transmits the error occurrence state.
[Claim 2]
The wireless device according to claim 1,
wherein the wireless link is a CPRI (Common Public Radio
10 Interface) link, and
15
wherein the region that can be freely used by the user is a vender
specific region.
[Claim 3]
The wireless device according to claim 1 or 2,
wherein the error is a violation in 8B/ 1 OB decoding.
[Claim 4]
The wireless device according to any one of claims 1 to 3,
20 wherein the wireless device further stores information showing a
specified part of the wireless link that the error occurred in the region that
can be freely used by the user in the wireless link and transmits the
information.
25 [Claim 5]
A wireless control system comprising:
One or more of the wireless device according to any one of claims 1
to 4; and
the wireless control device for controlling the wireless device,
5
10
25
wherein the wireless link connects the wireless control device and
each of the wireless devices.
[Claim 6]
The wireless control system according to claim 5,
wherein the wireless device transmits the error occurrence state to
the wireless control device through another of the wireless devices.
[Claim 7]
A method for monitoring a wireless link error comprising:
storing an error occurrence state in a wireless link in a region that
can be freely used by a user in the wireless link; and
transmitting the error occurrence state.
15 [Claim 8]
The method for monitoring a wireless link error according to claim
7,
wherein the wireless link is CPRI, and
wherein the region that can be freely used by the user IS a vender
20 specific region.
[Claim 9]
The method for monitoring a wireless link error according to claim
7 or 8,
25 wherein the error is an 8B/l OB violation.
[Claim 1 0]
The method for monitoring a wireless link error according to any
one of claims 7 to 9,
26
wherein the wireless device further stores information showing a
specified part of the wireless link that the error occurred in the region that
can be freely used by the user in the wireless link and transmits the
information.