CN1175831A - Method of Detecting Signals in Wireless Local Area Network - Google Patents

Method of Detecting Signals in Wireless Local Area Network Download PDF

Info

Publication number
CN1175831A
CN1175831A CN97115282A CN97115282A CN1175831A CN 1175831 A CN1175831 A CN 1175831A CN 97115282 A CN97115282 A CN 97115282A CN 97115282 A CN97115282 A CN 97115282A CN 1175831 A CN1175831 A CN 1175831A
Authority
CN
China
Prior art keywords
frequency
signal
wireless channel
threshold
value
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN97115282A
Other languages
Chinese (zh)
Other versions
CN1144413C (en
Inventor
成尚宪
李明焕
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ericsson LG Co Ltd
Ericsson LG Enterprise Co Ltd
Original Assignee
LG Information and Communications Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by LG Information and Communications Ltd filed Critical LG Information and Communications Ltd
Publication of CN1175831A publication Critical patent/CN1175831A/en
Application granted granted Critical
Publication of CN1144413C publication Critical patent/CN1144413C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/08—Testing, supervising or monitoring using real traffic
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0808—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA]
    • H04W74/0825—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA] with collision detection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0833—Random access procedures, e.g. with 4-step access
    • H04W74/0841—Random access procedures, e.g. with 4-step access with collision treatment
    • H04W74/0858—Random access procedures, e.g. with 4-step access with collision treatment collision detection

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Small-Scale Networks (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

本发明提供一种在无线LAN中使用的终端装置通过检查其他终端装置是否在使用一无线信道以便发送数据的检测信号的方法,该方法包括以下步骤:(1)反复将一从无线信道提供的信号的反向扩散值与一具有一预定频率的预定阈值比较;(2)当在步骤(1)中该信号的反向扩散值超过所述阈值时检查所述频率是否大于固定阈值超过频率;(3)如果在步骤(2)中当该反向扩散值超过所述阈值时所述频率大于固定阈值超过频率,则判定一其他终端装置的信号存在于该无线信道中;和(4)如果在步骤(2)中当该反向扩散值超过所述阈值时所述频率小于固定阈值超过频率,则判定在该无线信道中不存在其他终端装置的信号。

Figure 97115282

The present invention provides a method for a terminal device used in a wireless LAN to transmit a data detection signal by checking whether other terminal devices are using a wireless channel. The method includes the following steps: (1) repeatedly sending a The backdiffusion value of the signal is compared with a predetermined threshold value having a predetermined frequency; (2) when the backdiffusion value of the signal exceeds the threshold value in step (1), checking whether the frequency is greater than the fixed threshold value exceeds the frequency; (3) If in step (2) when the backdiffusion value exceeds the threshold, the frequency is greater than a fixed threshold exceeding the frequency, then it is determined that a signal of another terminal device exists in the wireless channel; and (4) if In step (2), when the backdiffusion value exceeds the threshold and the frequency is less than a fixed threshold exceeding the frequency, it is determined that there are no signals of other terminal devices in the wireless channel.

Figure 97115282

Description

在无线局域网中检测信号的方法Method of Detecting Signals in Wireless Local Area Network

本发明涉及一种无线局域网(LAN)，确切地说，涉及一种检测其他终端装置的信号的方法，以便当一预定终端装置想要发送数据时确定在无线局域网中的其他终端装置是否使用该无线信道。The present invention relates to a wireless local area network (LAN), and more particularly to a method of detecting signals of other terminal devices in order to determine whether other terminal devices in the wireless local area network use the signal when a predetermined terminal device wants to send data. wireless channel.

一般说来，当一包括在无线LAN中的终端装置通过无线信道发送数据时，应对其进行检查是否其他终端装置使用了该无线信道，以便当该无线信道没被其他终端装置占用时能够成功地发送所述数据。这一用于检查其他终端装置是否使用了该无线信道的规则在IEEE801.11标准中做出了规定。Generally speaking, when a terminal device included in a wireless LAN transmits data through a wireless channel, it should be checked whether other terminal devices use the wireless channel, so that when the wireless channel is not occupied by other terminal devices, it can successfully Send the data. This rule for checking whether other terminal devices use the wireless channel is specified in the IEEE801.11 standard.

同时，介绍了一种随机退避(back-off)方法，一种在IEEE801.11标准中规定的无线信道进入方法。用于检测在该无线信道中是否存在一信号的方法以这样的方式执行，即一旦发送数据帧首先固定一预定时间周期，和在一预定时间周期逝去的每一次对无线信道进行检查。如果没检测到信号，所述固定预定时间周期被减小一个预定时间周期。如果检测到该信号，则该固定预定时间周期被保持。在通过检测在该无线信道中的信号检查了是否其他终端装置使用了该无线信道之后，如果所述固定预定时间周期被减到＂0＂，则终端装置判定该无线信道没有被其他终端装置占用并通过该无线信道发送数据帧。At the same time, a random back-off (back-off) method, a wireless channel entry method specified in the IEEE801.11 standard, is introduced. The method for detecting the presence or absence of a signal in the wireless channel is performed in such a manner that a predetermined time period is first fixed once a data frame is transmitted, and the wireless channel is checked every time a predetermined time period elapses. If no signal is detected, the fixed predetermined time period is reduced by a predetermined time period. If the signal is detected, the fixed predetermined time period is maintained. After checking whether other terminal devices use the wireless channel by detecting signals in the wireless channel, if the fixed predetermined time period is reduced to "0", the terminal device judges that the wireless channel is not occupied by other terminal devices And send data frames through the wireless channel.

如图1所示，用于在无线信道中检测信号的信号检测装置包括：解调部件11a和11b，码反向扩散(code reverse diffusing)部件12a和12b，平均计算部件13a和13b，求和部件14和控制部件15。解调部件11a和11b解调自无线信道施加的信号r(t)和将它输出到与其连接的码反向扩散部件12a和12b。码反向扩散部件12a和12b把伪噪声(PN)值扩散到自与其连接的解调部件11a和11b施加的信号中，并将它输出到与其连接的平均计算部件13a和13b。此外，平均计算部件13a和13b将自码反向扩散部件12a和12b施加的信号的平均值输出到求和部件14。该求和部件14通过对从与其连接的平均计算部件13a和13b提供的信号求平方求平均，并将该平均值输出到控制部件15。控制部件15控制该终端装置的通信操作。控制部件15检查该从求和部件14施加的信号的反向扩散值是否大于阈值，和确定是否在该无线信道中存在信号。如果来自求和部件14的信号的反向扩散值高于该阈值，则确定信号是在该无线信道中，反之亦然。As shown in Figure 1, the signal detection device that is used to detect signal in wireless channel comprises: demodulation part 11a and 11b, code reverse diffusion (code reverse diffusing) part 12a and 12b, average calculation part 13a and 13b, summation Part 14 and control part 15. The demodulation sections 11a and 11b demodulate the signal r(t) applied from the wireless channel and output it to the code backdiffusion sections 12a and 12b connected thereto. Code back-diffusion sections 12a and 12b diffuse pseudo noise (PN) values into signals applied from demodulation sections 11a and 11b connected thereto, and output it to average calculation sections 13a and 13b connected thereto. Furthermore, the average calculation sections 13 a and 13 b output the average value of the signals applied from the code backdiffusion sections 12 a and 12 b to the summation section 14 . The summation section 14 averages by squaring the signals supplied from the average calculation sections 13 a and 13 b connected thereto, and outputs the average value to the control section 15 . The control section 15 controls the communication operation of the terminal device. The control section 15 checks whether the backdiffusion value of the signal applied from the summation section 14 is greater than a threshold value, and determines whether there is a signal in the wireless channel. If the backdiffusion value of the signal from the summing means 14 is above the threshold, it is determined that the signal is in the wireless channel, and vice versa.

这就是说，一般地，为了检查是否其他终端在使用该无线信道，控制部件15检查在一预定时间周期逝去的每一次接收的信号的反向扩散值是否高于所述阈值，如图2所示。如果该反向扩散值高于所述阈值，则确定在该无线信道中存在一信号，而如果该反向扩散值低于所述阈值，则确定在该无线信道中没有信号。That is to say, in general, in order to check whether other terminals are using the wireless channel, the control section 15 checks whether the backdiffusion value of the received signal every time a predetermined time period elapses is higher than the threshold value, as shown in FIG. 2 Show. If the backdiffusion value is higher than the threshold, it is determined that there is a signal in the wireless channel, and if the backdiffusion value is lower than the threshold, it is determined that there is no signal in the wireless channel.

在通常的方法中，在一预定时间周期逝去的每一次都对无线信道中的信号存在进行检查，结果，如果由于严重差错使得一信号值高于所述阈值，和如果由于无线干扰或衰落使得该信号输入的幅度变得很小，则很可能发生判定差错。由于这种判定差错，使得不可能正确地确定无线信道中信号的存在，由此在数据传输中造成差错。In the usual method, a check is made for the presence of a signal in the radio channel each time a predetermined period of time elapses, as a result, if a signal value is above said threshold due to a severe error, and if due to radio interference or fading the If the amplitude of this signal input becomes small, a determination error is likely to occur. Due to such decision errors, it is impossible to correctly determine the presence of a signal in a wireless channel, thereby causing errors in data transmission.

因此，本发明提供一种在无线LAN中检测信号的方法，该方法消除了由于相关技术的局限和缺陷导致的一个或多个问题。Accordingly, the present invention provides a method of detecting a signal in a wireless LAN that obviates one or more problems due to limitations and disadvantages of the related art.

本发明的目的是提供一种当一预定终端装置想要在一无线LAN中发送数据时正确检测其他终端装置是否在使用一无线信道的方法。An object of the present invention is to provide a method for correctly detecting whether other terminal devices are using a wireless channel when a predetermined terminal device wants to transmit data in a wireless LAN.

本发明的其他特性和优点将在下面的描述中详细说明，其中部分特性和优点在描述中将是明显的，或可通过实施本发明获得。本发明的目的和其他优点将通过在说明书和权利要求书以及附图中特别指出的结构实现和获得。Additional features and advantages of the invention will be set forth in the description which follows, and some of these features and advantages will be apparent from the description, or may be obtained by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

正如所体现和概括描述的，为了实现这些和其他优点以及根据本发明的目的，由一在无线LAN中使用的终端装置通过检查其他终端装置是否在使用一无线信道以便发送数据的检测信号的方法包括以下步骤：As embodied and broadly described, in order to achieve these and other advantages and purposes according to the present invention, a method for detecting signals by a terminal device used in a wireless LAN by checking whether other terminal devices are using a wireless channel in order to transmit data Include the following steps:

(1)按一预定频率反复将一从无线信道提供的信号的反向扩散值与一预定阈值比较；(1) repeatedly comparing a backspread value of a signal provided from a wireless channel with a predetermined threshold at a predetermined frequency;

(2)当在步骤(1)中该信号的反向扩散值超过所述阈值时检查所述频率是否大于固定阈值超过频率；(2) check whether the frequency is greater than a fixed threshold exceeding frequency when the backdiffusion value of the signal exceeds the threshold in step (1);

(3)如果在步骤(2)中当该反向扩散值超过所述阈值时所述频率大于固定阈值超过频率，则判定一其他终端装置的信号存在于该无线信道中；和(3) If in step (2) when the backdiffusion value exceeds the threshold, the frequency is greater than a fixed threshold exceeding the frequency, then it is determined that a signal of another terminal device exists in the wireless channel; and

(4)如果在步骤(2)中当该反向扩散值超过所述阈值时所述频率小于固定阈值超过频率，则判定在该无线信道中不存在其他终端装置的信号。(4) If the frequency is less than a fixed threshold exceeding frequency when the backdiffusion value exceeds the threshold in step (2), it is determined that there are no signals of other terminal devices in the wireless channel.

将会明白，上面总的描述和下面的详细描述均是示例性与说明性的，其目的是想要提供对如权利要求限定的发明进行说明。It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide explanation of the invention as claimed.

用于提供对本发明的进一步的理解并构成说明书一部分的附图示出了本发明的实施例，其与文字描述一起用于对本发明的原理进行解释。The accompanying drawings, which are included to provide a further understanding of the invention and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principle of the invention.

附图中：In the attached picture:

图1是在无线LAN中一信号检测装置的框图；Fig. 1 is a block diagram of a signal detection device in a wireless LAN;

图2是表示通常的在无线LAN中的信号检测步骤的流程图；FIG. 2 is a flow chart showing the usual signal detection steps in a wireless LAN;

图3是表示根据本发明的在无线LAN中的信号检测步骤的流程图。Fig. 3 is a flow chart showing the signal detection steps in the wireless LAN according to the present invention.

下面将参考附图对本发明的优选实施例进行详细描述。Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

本发明以下列方式构成。为了发送数据，当一终端装置检查其他终端装置是否在使用一无线信道时，该终端装置在一预定时间周期逝去的每一次反复将该无线信道的信号值与一阈值比较。当该信号值大于该阈值时，则判定在该无线信道中存在一信号。通过这种方法，对该无线信道中信号的存在进行检测。本发明的操作通过图1的信号检测装置执行。The present invention is constituted in the following manner. To transmit data, when a terminal device checks whether other terminal devices are using a wireless channel, the terminal device compares the signal value of the wireless channel with a threshold every time a predetermined time period elapses. When the signal value is greater than the threshold, it is determined that there is a signal in the wireless channel. In this way, the presence of a signal in the radio channel is detected. The operation of the present invention is performed by the signal detection device of FIG. 1 .

本发明的信号检测操作按图3的顺序执行。The signal detection operation of the present invention is performed in the sequence of FIG. 3 .

在步骤31，控制部件15固定一阈值超过频率N和一检查频率M为＂0＂，在步骤32，接收一通过求和部件14提供的信号，和在步骤33，检查该相应信号输入的反向扩散值是否超过所述阈值。一旦该反向扩散值超过所述阈值，在步骤34，控制部件15使阈值超过频率N加＂1＂，在步骤35使检查频率M加＂1＂，和在步骤36检查该检查频率M是否超过事先固定的检查频率T1。如果为否，则控制部件15返回到步骤32并重复上述操作。如果为是，在步骤37，控制部件15检查该阈值超过频率N是否超过事先固定的阈值超过频率T2。如果在步骤37为是，在步骤38中控制部件15判定一个其他终端装置的信号存在于该无线信道中。如果为否，在步骤39中控制部件15判定在该无线信道中不存在其他终端装置的信号。一旦步骤33的信号值输入没超过所述阈值，则控制部件15执行步骤35的操作。步骤32至35的操作重复一预定时间。在该预定时间中，控制部件15按所述固定检查频率T1反复地将反向扩散值与无线信道信号的预定阈值比较。如果当该信号的反向扩散值超过所述阈值时频率N大于固定阈值超过频率T2，则判定在该无线信道中存在信号。In step 31, the control unit 15 fixes a threshold exceeding frequency N and a check frequency M to "0", in step 32 receives a signal provided by the summing unit 14, and in step 33 checks the inverse of the corresponding signal input Whether the diffuse value exceeds the threshold. Once the backdiffusion value exceeds the threshold, in step 34, the control unit 15 adds "1" to the threshold exceeding frequency N, adds "1" to the checking frequency M in step 35, and checks in step 36 whether the checking frequency M Exceeds the previously fixed inspection frequency T1. If not, the control section 15 returns to step 32 and repeats the above operations. If yes, at step 37 the control unit 15 checks whether the threshold exceeding frequency N exceeds a previously fixed threshold exceeding frequency T2. If YES in step 37, in step 38 the control section 15 judges that a signal of another terminal device exists in the wireless channel. If not, the control section 15 determines in step 39 that there are no signals of other terminal devices in the wireless channel. Once the signal value input of step 33 does not exceed said threshold value, the control part 15 performs the operation of step 35 . The operations of steps 32 to 35 are repeated for a predetermined time. During the predetermined time, the control section 15 repeatedly compares the backdiffusion value with a predetermined threshold value of the radio channel signal at the fixed checking frequency T1. If the frequency N is greater than the fixed threshold exceeding the frequency T2 when the backdiffusion value of the signal exceeds the threshold, it is determined that there is a signal in the wireless channel.

如上所述，一旦本发明对在无线信道中信号的存在进行检查以发送数据帧，本发明就在一预定时间周期逝去的每一次反复将该无线信道的信号值与该预定阈值进行比较。如果当该无线信道的信号值超过该阈值时所述频率大于所述固定的频率，则装置确定在该无线信道中存在信号，以便即使由于严重差错或如果由于无线干扰或衰落使得该信号输入的幅度变得很小从而导致提供了超过该阈值的信号时，本发明也能正确地判定在无线信道中信号的存在，而不会出现判定差错。As described above, once the present invention checks for the presence of a signal in the wireless channel to transmit a data frame, the present invention compares the signal value of the wireless channel with the predetermined threshold every time a predetermined time period elapses. If the frequency is greater than the fixed frequency when the signal value of the wireless channel exceeds the threshold value, the device determines that there is a signal in the wireless channel, so that the signal is input even if it is due to a serious error or if due to wireless interference or fading. Even when the amplitude becomes small so that a signal exceeding the threshold is provided, the present invention can correctly determine the presence of the signal in the wireless channel without a determination error.

本领域的技术人员将会明白，可对本发明的在无线局域网中信号检测的方法做出各种改进和变化，而不脱离本发明的精神或范围。因此，本发明是要覆盖包括在所附权利要求范围内的本发明的各种改进和变化以及它们的等效物。Those skilled in the art will understand that various improvements and changes can be made to the method for signal detection in a wireless local area network of the present invention without departing from the spirit or scope of the present invention. Thus, it is intended that the present invention cover the modifications and variations of this invention included within the scope of the appended claims and their equivalents.

Claims (1)

1.一种在无线LAN中使用的终端装置通过检查其他终端装置是否在使用一无线信道以便发送数据的检测信号的方法包括以下步骤：1. A method for a terminal device used in a wireless LAN to transmit a detection signal of data by checking whether other terminal devices are using a wireless channel, comprising the steps of: (1)按一预定频率反复将一从无线信道提供的信号的反向扩散值与一预定阈值比较；(1) repeatedly comparing a backspread value of a signal provided from a wireless channel with a predetermined threshold at a predetermined frequency; (2)当在步骤(1)中该信号的反向扩散值超过所述阈值时检查所述频率是否大于固定阈值超过频率；(2) check whether the frequency is greater than a fixed threshold exceeding frequency when the backdiffusion value of the signal exceeds the threshold in step (1); (3)如果在步骤(2)中当该反向扩散值超过所述阈值时所述频率大于固定阈值超过频率，则判定一其他终端装置的信号存在于该无线信道中；和(3) If in step (2) when the backdiffusion value exceeds the threshold, the frequency is greater than a fixed threshold exceeding the frequency, then it is determined that a signal of another terminal device exists in the wireless channel; and (4)如果在步骤(2)中当该反向扩散值超过所述阈值时所述频率小于固定阈值超过频率，则判定在该无线信道中不存在其他终端装置的信号。(4) If the frequency is less than a fixed threshold exceeding frequency when the backdiffusion value exceeds the threshold in step (2), it is determined that there are no signals of other terminal devices in the wireless channel.
CNB971152829A 1996-08-29 1997-08-29 Method of Detecting Signals in Wireless Local Area Network Expired - Lifetime CN1144413C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
KR36446/96 1996-08-29
KR36446/1996 1996-08-29
KR1019960036446A KR100192207B1 (en) 1996-08-29 1996-08-29 How to detect signals in wireless LAN

Publications (2)

Publication Number Publication Date
CN1175831A true CN1175831A (en) 1998-03-11
CN1144413C CN1144413C (en) 2004-03-31

Family

ID=19471432

Family Applications (1)

Application Number Title Priority Date Filing Date
CNB971152829A Expired - Lifetime CN1144413C (en) 1996-08-29 1997-08-29 Method of Detecting Signals in Wireless Local Area Network

Country Status (2)

Country Link
KR (1) KR100192207B1 (en)
CN (1) CN1144413C (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100355298C (en) * 1998-09-07 2007-12-12 松下电器产业株式会社 Communication terminal apparatus, base station communication apparatus and radio communication method
CN100456764C (en) * 2002-04-25 2009-01-28 国际商业机器公司 A system and method for securely wirelessly transmitting data in a wireless local area network

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100374028B1 (en) * 1999-09-06 2003-02-26 삼성전자주식회사 Apparatus and method for detecting a received on-off keying signal in a cdma mobile communication system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100355298C (en) * 1998-09-07 2007-12-12 松下电器产业株式会社 Communication terminal apparatus, base station communication apparatus and radio communication method
CN100456764C (en) * 2002-04-25 2009-01-28 国际商业机器公司 A system and method for securely wirelessly transmitting data in a wireless local area network

Also Published As

Publication number Publication date
CN1144413C (en) 2004-03-31
KR19980016759A (en) 1998-06-05
KR100192207B1 (en) 1999-06-15

Similar Documents

Publication Publication Date Title
EP1755253B1 (en) Diagnostic method and transceiver for multicarrier modems
CN1144406C (en) CDMA mobile communication system and its random access control method and base station
US7904107B2 (en) Method and apparatus for providing biasing criteria for binary decisions for use in wireless communications to enhance protection
US6526031B1 (en) Forward power control determination in spread spectrum communications systems
US4807274A (en) Telephone line quality testing system
CN1144413C (en) Method of Detecting Signals in Wireless Local Area Network
CA2201084C (en) Data packet transmission method and apparatus for practicing the same
EP1560357B1 (en) Method and apparatus for detecting a three-state signal in a base station in a wireless communications system
CN116827431A (en) MPI detection method and system
JP3485248B2 (en) Power line communication device
JPH08293992A (en) Facsimile equipment
EP1231597B1 (en) Method and decoder for detecting bad speech frames based on the spectral difference to the last uncorrupted frame
US6856607B1 (en) System and method for detecting valid indicator signals
AU2014208320B2 (en) Diagnostic methods and systems for multicarrier modems
JP2522171B2 (en) Voice detector
CA2726826C (en) Diagnostic methods and systems for multicarrier modems
AU2017201226A1 (en) Diagnostic methods and systems for multicarrier modems
US20090227250A1 (en) Method for detecting a cpe alert signal of a telecommunication system by utilizing an energy ratio
JP2002247014A (en) Bit error rate estimation device and its method
JP2000228688A (en) Modem in full duplex transmission system
EP1826921A1 (en) Method for biasing criteria in a wireless system
JPH05257913A (en) Health check system
KR960039715A (en) Power control method between personal mobile communication
JPH0630148A (en) Modem detector

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
C14 Grant of patent or utility model
GR01 Patent grant
C56 Change in the name or address of the patentee

Owner name: LG ELECTRONICS CO., LTD.

Free format text: FORMER NAME OR ADDRESS: LG INFORMATION + COMMUNICATIONS LTD.

CP03 Change of name, title or address

Address after: Seoul, South Kerean

Patentee after: LG Electronics Inc.

Address before: Seoul, South Kerean

Patentee before: LG Information & Communications, Ltd.

ASS Succession or assignment of patent right

Owner name: LG-NORTEL CO., LTD.

Free format text: FORMER OWNER: LG ELECTRONICS CO., LTD.

Effective date: 20060707

C41 Transfer of patent application or patent right or utility model
TR01 Transfer of patent right

Effective date of registration: 20060707

Address after: Seoul, South Kerean

Patentee after: LG-Nortel Co.,Ltd.

Address before: Seoul, South Kerean

Patentee before: LG Electronics Inc.

ASS Succession or assignment of patent right

Owner name: LG- NORTEL CO., LTD.

Free format text: FORMER OWNER: LG ELECTRONIC CO., LTD.

Effective date: 20061110

C41 Transfer of patent application or patent right or utility model
TR01 Transfer of patent right

Effective date of registration: 20061110

Address after: Seoul, South Kerean

Patentee after: LG-Nortel Corp.

Address before: Seoul, South Kerean

Patentee before: LG Electronics Inc.

C56 Change in the name or address of the patentee

Owner name: LG-ERICSSON CO., LTD.

Free format text: FORMER NAME: LG-NORTEL CO., LTD.

CP01 Change in the name or title of a patent holder

Address after: Seoul, Korea

Patentee after: LG-Ericsson Co.,Ltd.

Address before: Seoul, Korea

Patentee before: LG-Nortel Corp.

ASS Succession or assignment of patent right

Owner name: ERICSSON-LG ENTERPRISE CO., LTD.

Free format text: FORMER OWNER: ERICSSON-LG CO., LTD.

Effective date: 20140217

C56 Change in the name or address of the patentee

Owner name: ERICSSON-LG CO., LTD.

Free format text: FORMER NAME: LG-ERICSSON CO., LTD.

CP01 Change in the name or title of a patent holder

Address after: Seoul, South Kerean

Patentee after: ERICSSON-LG Co.,Ltd.

Address before: Seoul, South Kerean

Patentee before: LG-Ericsson Co.,Ltd.

CP03 Change of name, title or address
TR01 Transfer of patent right

Effective date of registration: 20140217

Address after: Gyeonggi Do, South Korea

Patentee after: Ericsson -LG enterprise Kabushiki Kaisha

Address before: Seoul, South Kerean

Patentee before: ERICSSON-LG Co.,Ltd.

TR01 Transfer of patent right
CX01 Expiry of patent term
CX01 Expiry of patent term

Granted publication date: 20040331