WO2023136430A1 - 전자 장치 및 로밍 방법 - Google Patents
전자 장치 및 로밍 방법 Download PDFInfo
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- WO2023136430A1 WO2023136430A1 PCT/KR2022/015440 KR2022015440W WO2023136430A1 WO 2023136430 A1 WO2023136430 A1 WO 2023136430A1 KR 2022015440 W KR2022015440 W KR 2022015440W WO 2023136430 A1 WO2023136430 A1 WO 2023136430A1
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- roaming
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/08—Reselecting an access point
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/16—Performing reselection for specific purposes
- H04W36/18—Performing reselection for specific purposes for allowing seamless reselection, e.g. soft reselection
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/24—Reselection being triggered by specific parameters
- H04W36/26—Reselection being triggered by specific parameters by agreed or negotiated communication parameters
- H04W36/28—Reselection being triggered by specific parameters by agreed or negotiated communication parameters involving a plurality of connections, e.g. multi-call or multi-bearer connections
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/24—Reselection being triggered by specific parameters
- H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
- H04W84/10—Small scale networks; Flat hierarchical networks
- H04W84/12—WLAN [Wireless Local Area Networks]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/02—Terminal devices
Definitions
- One embodiment of the present invention relates to an electronic device and a roaming method.
- Electronic devices may provide functions such as voice calls, video calls, video streaming, or the Internet.
- Various functions provided by the electronic device may be provided through a mobile communication method or a wireless communication method.
- a wireless communication method may include wireless fidelity (Wi-Fi).
- Wi-Fi is a wireless local area network (WLAN) technology that enables access to the Internet in a substantially 2.4 GHz, substantially 5 GHz, or substantially 6 GHz frequency band.
- An electronic device may be connected to a network (eg, a Wi-Fi network) through an access point (AP). Since the coverage of the AP is limited, the electronic device may perform seamless wireless communication by performing roaming from a currently connected AP to another AP according to the movement of the electronic device.
- a network eg, a Wi-Fi network
- AP access point
- Roaming may refer to a series of operations for connecting to at least one other AP while being connected to and communicating with at least one AP. While the electronic device is performing communication through the currently connected AP, if the electronic device moves away from the currently connected AP due to movement or the communication situation with the currently connected AP becomes poor due to other reasons, the electronic device searches for at least one other AP. If a scan operation is performed for this purpose and an AP that satisfies a specified condition is found, a new connection can be created with the corresponding AP without disconnection. The aforementioned roaming operation is considered only when there is only one Wi-Fi link, and thus may cause unnecessary or unexpected operation. A roaming operation considering a plurality of Wi-Fi links may be required.
- One embodiment may provide a technique for differentiating a roaming operation according to states of a plurality of links between an electronic device and an AP.
- An electronic device stores a wireless communication module configured to transmit and receive a wireless signal, a processor operatively connected to the wireless communication module, and instructions electrically connected to the processor and executable by the processor.
- the processor determines whether roaming is triggered by a roaming trigger while connected by forming a plurality of links with an access point (AP), and the roaming
- AP access point
- states of the plurality of links may be checked, and a roaming operation may be differentiated and performed according to the states of the plurality of links.
- An operating method of an electronic device includes an operation of determining whether roaming is triggered by a roaming trigger while connected by forming a plurality of links with an access point (AP), and in response to the roaming trigger, the plurality of links It may include an operation of checking states of links and an operation of differentiated and performing a roaming operation according to the states of the plurality of links.
- AP access point
- a roaming operation can be efficiently performed by performing differentiated roaming operations according to states of a plurality of links in a situation where a plurality of links are formed.
- FIG. 1 shows an example of a WLAN system according to an embodiment.
- FIG. 2 shows another example of a WLAN system according to an embodiment.
- FIG. 3 is a diagram for explaining a link setup operation according to an exemplary embodiment.
- FIG. 4 is a diagram for explaining multi-link communication according to an embodiment.
- FIG. 5 shows an example of a channel used/supported/defined within a 2.4 GHz band in general according to an embodiment.
- FIG. 6 shows an example of a channel used/supported/defined within a substantially 5 GHz band according to an embodiment.
- FIG. 7 shows an example of a channel used/supported/defined within a 6 GHz band in general according to an embodiment.
- FIG. 8 is a diagram for describing a roaming operation according to an exemplary embodiment.
- FIG. 9 is a diagram for explaining roaming in a multi-link environment according to an exemplary embodiment.
- FIG. 10 is a diagram for explaining an example of roaming in a multi-link environment according to an embodiment.
- FIG. 11 is a diagram for explaining an example of a roaming operation method in a multi-link environment according to an embodiment.
- FIG. 12 is a diagram for explaining another example of a roaming operation method in a multi-link environment according to an embodiment.
- FIG. 13 is a diagram for explaining another example of a roaming operation method in a multi-link environment according to an embodiment.
- FIG. 14 is a diagram for explaining another example of a roaming operation method in a multi-link environment according to an embodiment.
- 15 is a diagram for explaining another example of a roaming operation method in a multi-link environment according to an embodiment.
- 16 is a block diagram of an electronic device in a network environment, according to one embodiment.
- FIG. 1 shows an example of a WLAN system according to an embodiment.
- a wireless LAN system 10 is configured in an infrastructure mode (where an access point (AP) exists in a structure of an IEEE (institute of electrical and electronic engineers) 802.11 wireless LAN (WLAN)). infrastructure mode).
- the WLAN system 10 may include one or more basic service sets (BSSs) (eg, BSS1 and BSS2).
- BSS (BSS1, BSS2) is a set of APs and STAs (stations) (e.g., electronic device 1301, electronic device 1302, or electronic device 1304 in FIG. 13) that can successfully synchronize and communicate with each other can mean BSS1 includes AP1 and STA1, and BSS2 may include two or more STA2 and STA3 connectable to one AP2.
- the wireless LAN system 10 connects at least one STA (STA1 to STA3), APs (AP1 and AP2) providing a distribution service, and a plurality of APs (AP1 and AP2). It may include a distribution system (100) for making.
- the distributed system 100 may implement an extended service set (ESS) by connecting a plurality of BSSs (BSS1 and BSS2).
- ESS may be used as a term indicating one network formed by connecting one or more APs (AP1, AP2) through the distributed system 100.
- APs (AP1, AP2) included in one ESS may have the same service set identification (SSID).
- the STAs are any functional medium including a medium access control (MAC) conforming to the IEEE 802.11 standard and a physical layer interface for a wireless medium.
- MAC medium access control
- STAs (STA1 to STA3) are electronic devices, mobile terminals, wireless devices, wireless transmit/receive units (WTRUs), user equipments (UEs) ), a mobile station (MS), a mobile subscriber unit, or simply a user.
- WTRUs wireless transmit/receive units
- UEs user equipments
- MS mobile station
- MS mobile subscriber unit
- FIG. 2 shows another example of a WLAN system according to an embodiment.
- a wireless LAN system 20 unlike the wireless LAN system 10 of FIG. It may indicate an ad-hoc mode for performing communication.
- the WLAN system 20 may include a BSS operating in an ad-hoc mode, that is, an independent basic service set (IBSS) (BSS).
- IBSS independent basic service set
- the IBSS since the IBSS does not include an AP, there may be no centralized management entity.
- STAs can be managed in a distributed manner.
- all STAs can be made up of mobile STAs, and access to a distributed system (eg, distributed system 100 in FIG. 1) is not allowed, so a self-contained network (or self-contained network) can be achieved. .
- FIG. 3 is a diagram for explaining a link setup operation according to an exemplary embodiment.
- a link setup operation may be performed between devices (eg, an STA 301 and an AP 401) to communicate with each other.
- devices eg, an STA 301 and an AP 401
- network discovery, authentication, association establishment, and security configuration operations may be performed.
- the link setup operation may be a session initiation operation or a session setup operation.
- operations of discovery, authentication, association, and security setting of link setup operations may be collectively referred to as association operations.
- the network discovery operation may include operation 310 and operation 320 .
- the STA 301 eg, the electronic device 1601, the electronic device 1602, or the electronic device 1604 of FIG. 16
- the STA 301 may perform a scanning operation to access a network to find a network that can participate.
- the scanning operation may include an active scanning operation and a passive scanning operation.
- the AP 401 may transmit a probe response frame as a response to the probe request frame to the STA 301 that has transmitted the probe request frame.
- an authentication operation including operations 330 and 340 may be performed.
- the STA 301 may transmit an authentication request frame to the AP 401.
- the AP 401 may determine whether to allow authentication of the corresponding STA 301 based on information included in the authentication request frame.
- the AP 401 may provide the result of authentication processing to the STA 301 through an authentication response frame.
- An authentication frame used for authentication request/response may correspond to a management frame.
- the authentication frame includes an authentication algorithm number, an authentication transaction sequence number, a status code, a challenge text, a robust security network (RSN), Alternatively, information on a finite cyclic group may be included.
- RSN robust security network
- an association operation including operations 350 and 360 may be performed.
- the STA 301 may transmit an association request frame to the AP 401.
- the AP 401 may transmit an association response frame to the STA 301 in response to the association request frame.
- the association request frame and/or the association response frame may include information related to various capabilities.
- the connection request frame includes information related to various capabilities, beacon listen interval, service set identifier (SSID), supported rates, supported channels, RSN, mobility domain , supported operating classes, traffic indication map broadcast request (TIM) broadcast request, and/or information on interworking service capability.
- an association response frame may include information related to various capabilities, a status code, an association ID (AID), an assist rate, an enhanced distributed channel access (EDCA) parameter set, a received channel power indicator (RCPI), and a received signal to noise (RSNI). indicator), mobility domain, timeout interval (association comeback time), overlapping BSS scan parameters, TIM broadcast response, and/or QoS map.
- a security setup operation including operations 370 and 380 may be performed.
- the security setup operation may be performed through a robust security network association (RSNA) request/response.
- RSNA robust security network association
- the security setup operation may include an operation of private key setup through 4-way handshaking through an extensible authentication protocol over LAN (EAPOL) frame.
- EAPOL extensible authentication protocol over LAN
- the security setup operation may be performed according to a security scheme not defined in the IEEE 802.11 standard.
- a secure session is established between the STA 301 and the AP 401 according to a secure setup operation, and the STA 301 and the AP 401 may perform secure data communication.
- FIG. 4 is a diagram for explaining multi-link communication according to an embodiment.
- devices may support multi-link (or multi-band) communication.
- Devices supporting multi-link communication eg, the STA 301 and the AP 401 may simultaneously perform communication through a plurality of links (eg, the plurality of links 410 to 430).
- a link may span one channel (e.g., a channel with a bandwidth of approximately 20/40/80/160/240/320 MHz) generally defined in the 2.4 GHz band, usually the 5 GHz band, usually the 6 GHz band, and/or a designated band.
- Multi-link communication means communication supporting a plurality of links eg, a plurality of links 410 to 430
- the STA 301 and/or AP 401 supports a plurality of bands (eg, approximately 2.4 GHz band, approximately 5 GHz band, approximately 6 GHz band, and/or a designated band) may mean that communication is simultaneously performed on a channel defined.
- the STA 301 and the AP 401 may perform multi-link communication supporting two or more of a substantially 2.4 GHz band, a substantially 5 GHz band, a substantially 6 GHz band, and/or a designated band.
- the STA 301 may perform a scan operation (eg, scanning) for AP discovery in a channel (eg, all channels) of a substantially 2.4 GHz band, a substantially 5 GHz band, and a substantially 6 GHz band. .
- the STA 301 may sequentially perform scan operations on bands, or may simultaneously perform scan operations on two or more bands.
- the STA 301 may determine the AP 401 as a target AP (eg, an AP to be accessed) from among one or more candidate APs detected (or identified) through a scan operation. Thereafter, an authentication operation (eg, operations 330 and 340 of FIG. 3 ), an association operation (eg, operations 350 and 360 of FIG. 3 ), and a security setup operation (eg, operations 330 and 340 of FIG. 3 ) are performed between the STA 301 and the AP 401 . Operations 370 and 380 of FIG. 3 are performed, and the STA 301 may perform communication by forming a plurality of links 410 to 430 with the AP 401 .
- an authentication operation eg, operations 330 and 340 of FIG. 3
- an association operation eg, operations 350 and 360 of FIG. 3
- a security setup operation eg, operations 330 and 340 of FIG. 3
- FIG. 5 shows an example of a channel used/supported/defined within a 2.4 GHz band in general according to an embodiment.
- a generally 2.4 GHz band may refer to a frequency region in which channels having a center frequency approximately adjacent to 2.4 GHz (eg, channels having a center frequency located within approximately 2.4 to approximately 2.5 GHz) are used/supported/defined. there is.
- An approximately 2.4 GHz band may include a plurality of channels with approximately 20 MHz bandwidth.
- Each channel having a bandwidth of approximately 20 MHz within the approximately 2.4 GHz band may have a channel index (eg, channel index 1 to channel index 14).
- the center frequency of a channel having a bandwidth of approximately 20 MHz assigned with channel index 1 may be approximately 2.412 GHz
- the center frequency of a channel having a bandwidth of approximately 20 MHz assigned with channel index 2 may be approximately 2.417 GHz.
- the center frequency of a channel having a bandwidth of approximately 20 MHz to which channel index N is allocated may be approximately (2.407 + 0.005*N) GHz.
- the channel index may be called various names such as a channel number. Specific values of the channel index and center frequency may be changed.
- Each of the first frequency domain 510 to the fourth frequency domain 540 may include one channel.
- the first frequency domain 510 includes channel 1 (eg, a channel having a channel index of channel 1 and having a bandwidth of approximately 20 MHz), and the center frequency of channel 1 may be set to approximately 2412 MHz.
- the second frequency domain 520 includes channel 6, and the center frequency of channel 6 may be set to approximately 2437 MHz.
- the third frequency domain 530 includes channel 11, and the center frequency of channel 11 may be set to approximately 2462 MHz.
- the fourth frequency domain 540 includes channel 14, and the center frequency of channel 14 may be set to approximately 2484 MHz.
- FIG. 6 shows an example of a channel used/supported/defined within a substantially 5 GHz band according to an embodiment.
- a substantially 5 GHz band may refer to a frequency region in which channels having a center frequency of approximately 5 GHz or more and generally less than 6 GHz (or generally less than 5.9 GHz) are used/supported/defined.
- the approximately 5 GHz band may include multiple channels between approximately 4.5 GHz and approximately 5.5 GHz. Specific numerical values shown in FIG. 6 may be changed.
- a plurality of channels within the 5 GHz band include unlicensed national information infrastructure (UNII)-1, UNII-2, UNII-3, and ISM.
- UNII-1 can be called UNII Low.
- UNII-2 may include frequency domains called UNII Mid and UNII-2Extended.
- UNII-3 could be called UNII-Upper.
- a plurality of channels may be set within the 5 GHz band, and the bandwidth of each channel may be set in various ways, such as approximately 20 MHz, approximately 40 MHz, approximately 80 MHz, or approximately 160 MHz.
- the approximately 5170 MHz to approximately 5330 MHz frequency region/range within UNII-1 and UNII-2 may be divided into eight approximately 20 MHz channels.
- a frequency area/range of approximately 5170 MHz to approximately 5330 MHz may be divided into four channels through an approximately 40 MHz frequency area.
- the approximately 5170 MHz to approximately 5330 MHz frequency region/range can be divided into two channels with approximately 80 MHz bandwidth.
- a frequency domain/range of approximately 5170 MHz to approximately 5330 MHz may be divided into one channel having a bandwidth of approximately 160 MHz.
- FIG. 7 shows an example of a channel used/supported/defined within a 6 GHz band in general according to an embodiment.
- a band of approximately 6 GHz may mean a frequency region in which channels having a center frequency of approximately 5.9 GHz or higher are used/supported/defined.
- a channel with a bandwidth of approximately 20 MHz may be defined from approximately 5.940 GHz.
- the leftmost channel may have a channel index of #1, and a center frequency of approximately 5.945 GHz may be allocated.
- the center frequency of channel index N may be determined to be approximately (5.940 + 0.005*N) GHz. Specific numerical values shown in FIG. 7 may be changed.
- the channel index of a channel having a bandwidth of 20 MHz is 1, 5, 9, 13, 17, 21, 25, 29, 33, 37, 41, 45, 49, 53, 57, 61, 65, 69, 73, 77, 81, 85, 89, 93, 97, 101, 105, 109, 113, 117, 121, 125, 129, 133, 137, 141, 145, 149, 153, 157, 161, 165, 169, 173, 177, 181, 185, 189, 193, 197, 201, 205, 209, 213, 217, 221, 225, 229, or 233.
- the indexes of channels having approximately 40 MHz bandwidth in FIG. 7 are 3, 11, 19, 27, 35, 43, 51, 59, 67, 75, 83 , 91, 99, 107, 115, 123, 131, 139, 147, 155, 163, 171, 179, 187, 195, 203, 211, 219, 227.
- a plurality of channels may be set within the 6 GHz band, and the bandwidth of each channel may be set in various ways, such as approximately 20 MHz, approximately 40 MHz, approximately 80 MHz, or approximately 160 MHz. In FIG. 7, channels having bandwidths of approximately 20, 40, 80, or 160 MHz are shown, but additionally channels with bandwidths of 240 MHz or 320 MHz may be added.
- FIG. 8 is a diagram for describing a roaming operation according to an exemplary embodiment.
- an STA 301 may be connected to a network through an AP (eg, an AP 401 or an AP 402). Since the coverage (eg, service coverage) of an AP (eg, AP 401) is limited, the STA 301 moves from a currently connected AP (eg, AP 401) to another AP (eg, AP 401) according to the movement of the STA 301.
- Example: Seamless wireless communication may be performed by performing roaming (eg, Inter AP roaming) to the AP 402 .
- the STA 301 may perform roaming when the distance to the AP (eg, AP 401) increases or the communication situation with the AP (eg, AP 401) deteriorates (or deteriorates) (eg, interference). there is.
- roaming may refer to a series of operations (or processes) of moving a connection to a second AP without disconnecting the connection while communicating with the first AP.
- the roaming operation includes a roaming trigger operation (eg, an operation to determine whether roaming is performed), a roaming scan operation, an AP selection operation (eg, an operation to select a target AP for roaming), an authentication operation (eg, operation 330 and operation 340 of FIG. 3 ), It may include an association operation (eg, operation 350 and operation 360 of FIG. 3 ), and a security setup operation (eg, operation 370 and operation 380 of FIG. 3 ).
- a roaming operation performed by the STA 301 will be described in detail.
- the STA 301 may determine whether roaming is triggered (eg, whether roaming is performed) while communicating with the currently connected AP 401.
- the STA 301 monitors parameters (eg, RSSI, Tx Error rate, signal to noise rate (SNR), and/or a combination of one or more of these) for the AP 401 and sets the value of the monitored parameter to a specified threshold. (eg, -75dBm in the case of RSSI) or less, it may be determined that roaming should be performed.
- parameters eg, RSSI, Tx Error rate, signal to noise rate (SNR), and/or a combination of one or more of these
- SNR signal to noise rate
- the STA 301 may perform a roaming scan operation to search for an accessable AP (eg, an AP supporting roaming) for a wireless communication connection in addition to the currently accessed AP 401.
- the STA 301 may perform a full scan and/or partial scan for AP discovery in a 2.4 GHz band, a 5 GHz band, and/or a 6 GHz band.
- a full scan may mean a scan of all available channels
- a partial scan may mean a scan of at least one channel rather than a scan of all available channels.
- the full scan and/or the partial scan may be performed for one or more designated bands (eg, a 2.4 GHz band, a 5 GHz band, and/or a 6 GHz band).
- the STA 301 may perform a partial scan using a channel list (eg, a roaming scan channel list) generated when connecting to the AP 401.
- a channel list eg, a roaming scan channel list
- the STA 301 may sequentially perform a roaming scan operation on a band or simultaneously perform a scan operation on two or more bands.
- the STA 301 may select a candidate AP that satisfies a specified condition among one or more accessable APs discovered (or identified) through a roaming scan operation as a roaming target AP.
- the STA 301 is a candidate AP (eg, RSSI, Channel Utilization, SNR, MAX Link Rate, parameters such as Estimated Throughput, Channel, or Band) satisfying conditions according to AP selection criteria (eg, RSSI, Channel Utilization, SNR, Estimated Throughput, etc.) from one or more discovered APs.
- AP selection criteria eg, RSSI, Channel Utilization, SNR, Estimated Throughput, etc.
- AP selection criteria may include parameters such as RSSI, Channel Utilization, SNR, MAX Link Rate, or Estimated Throughput, and may include a score calculated based on one or more of the above parameters.
- AP selection criteria may include selection and exclusion of a designated band and/or designated channel for AP selection.
- the STA 301 may perform operation 820 by adjusting one of a roaming scan period and a roaming scan type (eg, full scan or partial scan). According to one embodiment, operation 830 may be performed iteratively until a suitable AP is identified.
- a roaming scan period e.g, full scan or partial scan.
- operation 830 may be performed iteratively until a suitable AP is identified.
- an authentication operation (or re-authentication operation) between the STA 301 and the target AP 402 (eg : Operations 330 and 340 of FIG. 3 may be performed.
- an association operation (or re-association operation) between the STA 301 and the target AP 402 (eg, operation 350 and operation 360 of FIG. 3) is performed.
- a security setup operation (eg, operation 370 and operation 380 of FIG. 3) may be performed between the STA 301 and the target AP 402.
- a secure session is established between the STA 301 and the AP 402 according to a secure setup operation, and the STA 301 and the AP 402 may perform secure data communication.
- the AP 401 and the AP 402 may be included in one ESS and may have the same service set identification (SSID), but are not necessarily limited thereto.
- FIG. 9 is a diagram for explaining roaming in a multi-link environment according to an exemplary embodiment.
- the STA 301 and the AP 401 may support multi-link (or multi-band) communication.
- a plurality of links eg, a first link 410, a second link 420, and/or a 3 links 430
- the first link 410 includes one channel generally defined in the 6 GHz band
- the second link 420 includes one channel generally defined in the 5 GHz band
- the third link 430 generally includes one channel defined in the 5 GHz band. It may include one channel defined in the 2.4 GHz band.
- roaming may be triggered for each link 410 to 430 formed between the STA 301 and the AP 401 .
- the STA 301 monitors and monitors parameters (eg, RSSI, Tx Error rate, signal to noise rate (SNR), and/or a combination of one or more of these) for the AP 401 on each link 410 to 430
- parameters eg, RSSI, Tx Error rate, signal to noise rate (SNR), and/or a combination of one or more of these
- SNR signal to noise rate
- roaming is triggered for
- roaming is triggered for the second link 420 at the second location 920 where the RSSI for the second link 420 of the AP 401 becomes generally no better than -75 dBm;
- Roaming may be triggered for the third link 430 at a third location 930 where the RSSI for the third link 430 of the AP 401 becomes generally no better than -75 dBm or less.
- the STA 301 may check the status of the plurality of links 410 to 430 in response to a roaming trigger.
- the state may include one or more of the number of links associated with the roaming trigger, total link quality, and one or more designated link qualities.
- the STA 301 may differentiate and perform roaming operations according to states of the plurality of links 410 to 430 .
- the STA 301 may differentiate and perform one or more of the roaming scan operation and candidate AP selection operation included in the roaming operation according to the states of the plurality of links 410 to 430 .
- the roaming operation may be differentiated into a plurality of roaming levels according to the states of the plurality of links 410 to 430, and the STA 301 may select a plurality of links 410 to 430 among the plurality of roaming levels.
- a roaming operation may be performed at a roaming level corresponding to the checked state.
- At least one of the roaming scan operation and the AP selection operation included in the roaming operation may be differentiated and defined by being divided into a plurality of roaming levels.
- the roaming scan operation one or more of whether the roaming scan is started, the type of the roaming scan, the period of the roaming scan, and whether or not data is used for a designated link is differentiated according to the state of the plurality of links 410 to 430.
- the AP selection criteria eg, parameters such as RSSI, Channel Utilization, SNR, MAX Link Rate, Channel, Band, and Score, and/or a combination of one or more of these parameters
- determine the status of the plurality of links 410 to 430. can be differentiated according to
- an example in which a roaming operation is defined by being differentiated into a plurality of roaming levels according to roaming-triggered links may be as follows.
- Roaming level 1 is when roaming of the first link 410 is triggered
- roaming level 2 is the history of roaming of the first link 410 and the second link 420 being triggered
- roaming level 3 is the first link It may be considered when roaming of 410 to 3rd link 430 is triggered. Examples are provided for roaming levels 1, 2, and 3, but are not limited thereto.
- Roaming Level 1 Partial scan x times (eg, 1 or more times) only for the band of the triggered link (eg, the first link 410) (2) Among the scanned APs, select an AP that is generally 20dBm or more better than the RSSI of the currently connected AP (e.g., AP 401), and proceed with roaming to the AP with the best RSSI among the selected APs. 2.
- Roaming Level 2 (1) Perform a partial scan (eg, 6 GHz or 5 GHz) in sequential order by band (eg, 6 GHz is usually performed before 5 GHz) for the triggered links (eg, the first link 410 and the second link 420).
- the STA 301 When scanning for , since the STA 301 can communicate using generally 2.4 GHz, it scans generally 6 GHz and generally 5 GHz without overlapping.) (2) If no candidate AP is found, sequential partial scans are also performed on untriggered links (e.g., third link 430 (e.g., mostly 2.4 GHz)). (3) Partial scan is sequentially performed every 10 seconds for the second link 420 and/or the first link 410 (4) When performing a roaming scan, do not use data for that link (e.g.
- the link you are scanning (4) Among the scanned APs, select an AP that is generally 10dBm or more better than the RSSI of the currently connected AP (eg, AP 401), and proceed with roaming to the AP with the best RSSI among the selected APs.
- the STA 301 can perform an efficient roaming scan by not performing a roaming scan in unnecessary intervals or redundant roaming scans for links on which roaming is sequentially triggered. In addition, when roaming is triggered only for a certain link (eg, the first link 410) with respect to the currently connected AP 401, the STA 301 moves to another link (eg, the two links 420 and 430). Since communication is possible, roaming may not be performed unless an AP better than the currently connected AP 401 is found. As the STA 301 efficiently performs a roaming operation for each roaming level, the STA 301 can enable the user to use data without any inconvenience.
- a certain link eg, the first link 410
- the STA 301 moves to another link (eg, the two links 420 and 430). Since communication is possible, roaming may not be performed unless an AP better than the currently connected AP 401 is found.
- the STA 301 can enable the user to use data without any inconvenience.
- FIG. 10 is a diagram for explaining an example of roaming in a multi-link environment according to an embodiment.
- FIG. 10 for convenience of explanation, a plurality of links formed by the STA 301 and the AP 401 (eg, the first link 410, the second link 420, and/or the third link 430) ) is shown, and it is assumed that the STA 301 performs a roaming operation using roaming levels 1 to 3 described in FIG. 9 .
- the STA 301 performs a roaming operation using roaming levels 1 to 3 described in FIG. 9 .
- the STA 301 may operate in roaming level 1 with a link of approximately 6 GHz triggered.
- the STA 301 may generally perform a partial scan only for the 6 GHz band and may not perform any additional scans.
- the STA 301 may determine that network (eg, Wi-Fi) quality will be guaranteed because the RSSI of the 5 GHz and 2.4 GHz links is sufficiently good, and roaming is not necessarily performed yet.
- network eg, Wi-Fi
- roaming may be triggered for the link at approximately 5 GHz.
- the STA 301 may operate in roaming level 2 by triggering links of approximately 6 GHz and approximately 5 GHz.
- the STA 301 performs a partial scan for approximately 6 GHz and approximately 5 GHz, and if a candidate AP is not found in the partial scan (eg, the first partial scan), it may perform a partial scan for approximately 2.4 GHz.
- a candidate AP is not found in the partial scan (eg, the first partial scan)
- it may perform a partial scan for approximately 2.4 GHz.
- the STA 301 searches for the AP 402, and at this time, it can roam to the AP 402, which has an RSSI of approximately 6 GHz or 5 GHz, which is generally better than 10 dBm.
- FIG. 11 is a diagram for explaining an example of a roaming operation method in a multi-link environment according to an embodiment.
- operations 1110 to 1130 may be sequentially performed, but are not necessarily sequentially performed.
- the order of each operation 1110 to 1130 may be changed, or at least two operations may be performed in parallel.
- an STA (eg, the STA 301 of FIG. 9 ) connects an AP (eg, the AP 401 of FIG. 9 ) and a plurality of links (eg, the plurality of links 410 to 430 of FIG. 9 ). It is possible to determine whether roaming is triggered (eg, whether roaming is performed) while being connected by forming
- the STA 301 monitors parameters (eg, RSSI, Tx Error rate, signal to noise rate (SNR), and/or a combination of one or more of these) for the AP 401 and sets the value of the monitored parameter to a specified threshold. In the following cases, it may be determined that roaming should be performed.
- parameters eg, RSSI, Tx Error rate, signal to noise rate (SNR), and/or a combination of one or more of these
- the STA 301 may check the state of the plurality of links 410 to 430 in response to the roaming trigger.
- the state may include one or more and/or a combination of two or more of the number of links associated with triggering roaming, total link quality, and specified one or more link qualities.
- the STA 301 may differentiate and perform a roaming operation according to states of the plurality of links 410 to 430.
- FIG. 12 is a diagram for explaining another example of a roaming operation method in a multi-link environment according to an embodiment.
- operations 1210 to 1250 may be sequentially performed, but are not necessarily sequentially performed. For example, the order of each operation 1210 to 1250 may be changed, or at least two operations may be performed in parallel.
- the STA 301 may connect to an AP (eg, the AP 401 of FIG. 9).
- the STA 301 and the AP 401 may support multi-link (or multi-band) communication.
- a plurality of links (eg, the plurality of links 410 to 430 of FIG. 9 ) may be formed between the STA 301 and the AP 401 .
- the STA 301 may form a plurality of links 410 to 430 with the AP 401 to monitor a parameter (eg, RSSI) of the AP 401 while being connected.
- the STA 301 may monitor RSSI values for each link 410 to 430 of the AP 401.
- the STA 301 may monitor parameters (eg, RSSI) of the plurality of links 410 to 430 communicating with the AP 401 at a designated period.
- the STA 301 requires roaming for each link 410 to 430 if the RSSI value of at least one of the links 410 to 430 is less than a specified threshold value (eg, approximately -75 dBm). can be judged to be
- the STA 301 may check the number of roaming-triggered links in response to the roaming trigger.
- the STA 301 may differentiate and perform a roaming operation according to the number of links in which roaming is triggered.
- the roaming level of the roaming operation may be divided into a plurality and defined according to the number of links in which roaming is triggered. N may be the total number of links, but is not necessarily limited thereto.
- the roaming level may be defined by dividing the number of triggered links into ranges. N may be a natural number greater than or equal to 2.
- the STA 301 may perform a roaming operation according to a roaming level corresponding to the number of links in which roaming is triggered.
- FIG. 13 is a diagram for explaining another example of a roaming operation method in a multi-link environment according to an embodiment.
- FIG. 13 may be for explaining a method in which an STA (eg, the STA 301 of FIG. 9) performs a roaming operation differently according to the number of links for which roaming is not currently triggered after roaming is triggered.
- an STA eg, the STA 301 of FIG. 9
- operations 1310 to 1350 may be sequentially performed, but are not necessarily sequentially performed.
- the order of each operation 1310 to 1350 may be changed, or at least two operations may be performed in parallel.
- the STA 301 may connect to an AP (eg, the AP 401 of FIG. 9).
- the STA 301 and the AP 401 may support multi-link (or multi-band) communication.
- a plurality of links (eg, the plurality of links 410 to 430 of FIG. 9 ) may be formed between the STA 301 and the AP 401 .
- the STA 301 may form a plurality of links 410 to 430 with the AP 401 to monitor a parameter (eg, RSSI) of the AP 401 while being connected.
- the STA 301 may monitor RSSI values for each link 410 to 430 of the AP 401.
- the STA 301 may monitor parameters (eg, RSSI) of the plurality of links 410 to 430 communicating with the AP 401 at a designated period.
- the STA 301 performs roaming for each link 410 to 430 when the RSSI value of at least one of the links 410 to 430 is less than a specified threshold value (eg, approximately -75 dBm) can be judged to be
- a specified threshold value eg, approximately -75 dBm
- the STA 301 may check the number of links for which roaming is not triggered in response to the roaming trigger.
- the STA 301 may differentiate and perform a roaming operation according to the number of links for which roaming is not triggered.
- the roaming level of the roaming operation may be divided into a plurality and defined according to the number of links for which roaming is not triggered. M may be the total number of links, but is not necessarily limited thereto. For example, a roaming level may be defined by dividing the number of untriggered links into ranges. M may be a natural number equal to or greater than 2.
- the STA 301 may perform a roaming operation according to a roaming level corresponding to the number of links for which roaming is not triggered.
- FIG. 14 is a diagram for explaining another example of a roaming operation method in a multi-link environment according to an embodiment.
- FIG. 14 illustrates a method in which an STA (eg, the STA 301 of FIG. 9 ) performs a roaming operation differently according to the checked quality (eg, overall link quality) after checking the quality of all links after roaming is triggered.
- the checked quality eg, overall link quality
- operations 1410 to 1450 may be sequentially performed, but are not necessarily sequentially performed. For example, the order of each operation 1410 to 1450 may be changed, or at least two operations may be performed in parallel.
- the STA 301 may connect to an AP (eg, the AP 401 of FIG. 9).
- the STA 301 and the AP 401 may support multi-link (or multi-band) communication.
- a plurality of links (eg, the plurality of links 410 to 430 of FIG. 9 ) may be formed between the STA 301 and the AP 401 .
- the STA 301 may form a plurality of links 410 to 430 with the AP 401 to monitor a parameter (eg, RSSI) of the AP 401 while being connected.
- the STA 301 may monitor RSSI values for each link 410 to 430 of the AP 401.
- the STA 301 may monitor parameters (eg, RSSI) of the plurality of links 410 to 430 communicating with the AP 401 at a designated period.
- the STA 301 performs roaming for each link 410 to 430 when the RSSI value of at least one of the links 410 to 430 is less than a specified threshold value (eg, approximately -75 dBm) can be judged to be
- a specified threshold value eg, approximately -75 dBm
- the STA 301 may calculate the overall link quality in response to the roaming trigger.
- the overall link quality may be calculated based on the throughput of each link 410 to 430 .
- Throughput may be calculated through Equation 1, and throughput may be used as link quality.
- the STA 301 may calculate the throughput for each link 410 to 430 and obtain the sum of the throughputs to be calculated as the overall quality of the link.
- the STA 301 may differentiate and perform a roaming operation according to overall link quality.
- the roaming level of the roaming operation may be divided into a plurality and defined according to the value of the overall link quality.
- K is a natural number of 2 or more, and roaming levels may be divided into two or more and defined by one or more threshold values (or threshold ranges).
- the STA 301 may perform a roaming operation according to a roaming level corresponding to total link quality calculated (or checked) when roaming is triggered.
- 15 is a diagram for explaining another example of a roaming operation method in a multi-link environment according to an embodiment.
- an STA eg, the STA 301 of FIG. 9
- a roaming operation differently according to a designated link quality (eg, one or more link qualities) after checking the quality of each link after roaming is triggered. It may be to explain.
- operations 1510 to 1550 may be sequentially performed, but are not necessarily sequentially performed. For example, the order of each operation 1510 to 1550 may be changed, or at least two operations may be performed in parallel.
- the STA 301 may connect to an AP (eg, the AP 401 of FIG. 9).
- the STA 301 and the AP 401 may support multi-link (or multi-band) communication.
- a plurality of links (eg, the plurality of links 410 to 430 of FIG. 9 ) may be formed between the STA 301 and the AP 401 .
- the STA 301 may form a plurality of links 410 to 430 with the AP 401 to monitor a parameter (eg, RSSI) of the AP 401 while being connected.
- the STA 301 may monitor RSSI values for each link 410 to 430 of the AP 401.
- the STA 301 may monitor parameters (eg, RSSI) of the plurality of links 410 to 430 communicating with the AP 401 at a designated period.
- the STA 301 performs roaming for each link 410 to 430 when the RSSI value of at least one of the links 410 to 430 is less than a specified threshold value (eg, approximately -75 dBm) can be judged to be
- a specified threshold value eg, approximately -75 dBm
- the STA 301 may calculate the quality of one or more designated links in response to the roaming trigger. As described with reference to FIG. 14, link quality can be calculated through Equation 1.
- the designated one or more links may include one or more links for which roaming is not triggered upon triggering roaming.
- the STA 301 may be to calculate the quality of one or more links for which roaming is not triggered.
- the STA 301 may differentiate and perform a roaming operation according to the calculated link quality.
- the roaming level of the roaming operation may be divided into a plurality of levels and defined according to the calculated link quality value.
- J is a natural number of 2 or more, and roaming levels may be divided into two or more and defined by one or more threshold values (or threshold ranges).
- the STA 301 may perform a roaming operation according to a roaming level corresponding to link quality calculated (or checked) when roaming is triggered.
- FIG. 16 is a block diagram of an electronic device 1601 in a network environment 1600 according to one embodiment.
- an electronic device 1601 eg, the STA 301 of FIG. 3
- a first network 1698 eg, a short-distance wireless communication network
- STA 301 of FIG. 3 communicates with, or electronic device 1604 (eg STA 301 of FIG. 3) or server through the second network 1699 (eg, long-distance wireless communication network) (1608).
- the electronic device 1601 may communicate with the electronic device 1604 through the server 1608 .
- the electronic device 1601 includes a processor 1620, a memory 1630, an input module 1650, a sound output module 1655, a display module 1660, an audio module 1670, a sensor module ( 1676), interface 1677, connection terminal 1678, haptic module 1679, camera module 1680, power management module 1688, battery 1689, communication module 1690, subscriber identification module 1696 , or an antenna module 1697.
- a processor 1620 e.g, a memory 1630, an input module 1650, a sound output module 1655, a display module 1660, an audio module 1670, a sensor module ( 1676), interface 1677, connection terminal 1678, haptic module 1679, camera module 1680, power management module 1688, battery 1689, communication module 1690, subscriber identification module 1696 , or an antenna module 1697.
- at least one of these components eg, the connection terminal 1678
- some of these components eg, sensor module 16
- the processor 1620 for example, executes software (eg, the program 1640) to cause at least one other component (eg, hardware or software component) of the electronic device 1601 connected to the processor 1620. It can control and perform various data processing or calculations. According to one embodiment, as at least part of data processing or operation, the processor 1620 transfers instructions or data received from other components (e.g., sensor module 1676 or communication module 1690) to volatile memory 1632. , processing commands or data stored in the volatile memory 1632 , and storing resultant data in the non-volatile memory 1634 .
- software eg, the program 1640
- the processor 1620 transfers instructions or data received from other components (e.g., sensor module 1676 or communication module 1690) to volatile memory 1632. , processing commands or data stored in the volatile memory 1632 , and storing resultant data in the non-volatile memory 1634 .
- the processor 1620 may include a main processor 1621 (eg, a central processing unit or an application processor) or an auxiliary processor 1623 (eg, a graphic processing unit, a neural network processing unit ( NPU: neural processing unit (NPU), image signal processor, sensor hub processor, or communication processor).
- a main processor 1621 e.g, a central processing unit or an application processor
- an auxiliary processor 1623 e.g, a graphic processing unit, a neural network processing unit ( NPU: neural processing unit (NPU), image signal processor, sensor hub processor, or communication processor.
- NPU neural network processing unit
- the auxiliary processor 1623 may use less power than the main processor 1621 or be set to be specialized for a designated function.
- the auxiliary processor 1623 may be implemented separately from or as part of the main processor 1621 .
- the secondary processor 1623 may, for example, take the place of the main processor 1621 while the main processor 1621 is in an inactive (eg, sleep) state, or when the main processor 1621 is active (eg, running an application). ) state, together with the main processor 1621, at least one of the components of the electronic device 1601 (eg, the display module 1660, the sensor module 1676, or the communication module 1690) It is possible to control at least some of the related functions or states.
- the coprocessor 1623 eg, image signal processor or communication processor
- may be implemented as part of other functionally related components eg, camera module 1680 or communication module 1690). there is.
- the auxiliary processor 1623 may include a hardware structure specialized for processing an artificial intelligence model.
- AI models can be created through machine learning. Such learning may be performed, for example, in the electronic device 1601 itself where the artificial intelligence model is executed, or may be performed through a separate server (eg, the server 1608).
- the learning algorithm may include, for example, supervised learning, unsupervised learning, semi-supervised learning or reinforcement learning, but in the above example Not limited.
- the artificial intelligence model may include a plurality of artificial neural network layers.
- Artificial neural networks include deep neural networks (DNNs), convolutional neural networks (CNNs), recurrent neural networks (RNNs), restricted boltzmann machines (RBMs), deep belief networks (DBNs), bidirectional recurrent deep neural networks (BRDNNs), It may be one of deep Q-networks or a combination of two or more of the foregoing, but is not limited to the foregoing examples.
- the artificial intelligence model may include, in addition or alternatively, software structures in addition to hardware structures.
- the memory 1630 may store various data used by at least one component (eg, the processor 1620 or the sensor module 1676) of the electronic device 1601 .
- the data may include, for example, input data or output data for software (eg, the program 1640) and commands related thereto.
- the memory 1630 may include a volatile memory 1632 or a non-volatile memory 1634 .
- the program 1640 may be stored as software in the memory 1630, and may include, for example, an operating system 1642, middleware 1644, or an application 1646.
- the input module 1650 may receive a command or data to be used by a component (eg, the processor 1620) of the electronic device 1601 from an outside of the electronic device 1601 (eg, a user).
- the input module 1650 may include, for example, a microphone, a mouse, a keyboard, a key (eg, a button), or a digital pen (eg, a stylus pen).
- the sound output module 1655 may output sound signals to the outside of the electronic device 1601 .
- the sound output module 1655 may include, for example, a speaker or receiver.
- the speaker can be used for general purposes such as multimedia playback or recording playback.
- a receiver may be used to receive an incoming call. According to one embodiment, the receiver may be implemented separately from the speaker or as part of it.
- the display module 1660 can visually provide information to the outside of the electronic device 1601 (eg, a user).
- the display module 1660 may include, for example, a display, a hologram device, or a projector and a control circuit for controlling the device.
- the display module 1660 may include a touch sensor configured to detect a touch or a pressure sensor configured to measure the intensity of force generated by the touch.
- the audio module 1670 may convert sound into an electrical signal or vice versa. According to one embodiment, the audio module 1670 acquires sound through the input module 1650, the sound output module 1655, or an external electronic device connected directly or wirelessly to the electronic device 1601 (eg: Sound may be output through the electronic device 1602 (eg, a speaker or a headphone).
- the audio module 1670 acquires sound through the input module 1650, the sound output module 1655, or an external electronic device connected directly or wirelessly to the electronic device 1601 (eg: Sound may be output through the electronic device 1602 (eg, a speaker or a headphone).
- the sensor module 1676 detects an operating state (eg, power or temperature) of the electronic device 1601 or an external environment state (eg, a user state), and generates an electrical signal or data value corresponding to the detected state. can do.
- the sensor module 1676 may include, for example, a gesture sensor, a gyro sensor, an air pressure sensor, a magnetic sensor, an acceleration sensor, a grip sensor, a proximity sensor, a color sensor, an IR (infrared) sensor, a bio sensor, It may include a temperature sensor, humidity sensor, or light sensor.
- the interface 1677 may support one or more specified protocols that may be used to directly or wirelessly connect the electronic device 1601 to an external electronic device (eg, the electronic device 1602).
- the interface 1677 may include, for example, a high definition multimedia interface (HDMI), a universal serial bus (USB) interface, an SD card interface, or an audio interface.
- HDMI high definition multimedia interface
- USB universal serial bus
- SD card interface Secure Digital Card interface
- audio interface audio interface
- connection terminal 1678 may include a connector through which the electronic device 1601 may be physically connected to an external electronic device (eg, the electronic device 1602).
- the connection terminal 1678 may include, for example, an HDMI connector, a USB connector, an SD card connector, or an audio connector (eg, a headphone connector).
- the haptic module 1679 may convert electrical signals into mechanical stimuli (eg, vibration or movement) or electrical stimuli that a user can perceive through tactile or kinesthetic senses.
- the haptic module 1679 may include, for example, a motor, a piezoelectric element, or an electrical stimulation device.
- the camera module 1680 may capture still images and moving images. According to one embodiment, the camera module 1680 may include one or more lenses, image sensors, image signal processors, or flashes.
- the power management module 1688 may manage power supplied to the electronic device 1601 .
- the power management module 1688 may be implemented as at least part of a power management integrated circuit (PMIC), for example.
- PMIC power management integrated circuit
- the battery 1689 may supply power to at least one component of the electronic device 1601 .
- the battery 1689 may include, for example, a non-rechargeable primary cell, a rechargeable secondary cell, or a fuel cell.
- the communication module 1690 is a direct (eg, wired) communication channel or a wireless communication channel between the electronic device 1601 and an external electronic device (eg, the electronic device 1602, the electronic device 1604, or the server 1608). Establishment and communication through the established communication channel may be supported.
- the communication module 1690 may include one or more communication processors that operate independently of the processor 1620 (eg, an application processor) and support direct (eg, wired) communication or wireless communication.
- the communication module 1690 may be a wireless communication module 1692 (eg, a cellular communication module, a short-range wireless communication module, or a global navigation satellite system (GNSS) communication module) or a wired communication module 1694 (eg, a cellular communication module).
- GNSS global navigation satellite system
- a corresponding communication module is a first network 1698 (eg, a short-range communication network such as Bluetooth, wireless fidelity (WiFi) direct, or infrared data association (IrDA)) or a second network 1699 (eg, legacy It may communicate with the external electronic device 1604 through a cellular network, a 5G network, a next-generation communication network, the Internet, or a telecommunications network such as a computer network (eg, a LAN or a WAN).
- a first network 1698 eg, a short-range communication network such as Bluetooth, wireless fidelity (WiFi) direct, or infrared data association (IrDA)
- a second network 1699 eg, legacy It may communicate with the external electronic device 1604 through a cellular network, a 5G network, a next-generation communication network, the Internet, or a telecommunications network such as a computer network (eg, a LAN or a WAN).
- a telecommunications network
- the wireless communication module 1692 uses subscriber information (eg, International Mobile Subscriber Identifier (IMSI)) stored in the subscriber identification module 1696 within a communication network such as the first network 1698 or the second network 1699.
- subscriber information eg, International Mobile Subscriber Identifier (IMSI)
- IMSI International Mobile Subscriber Identifier
- the electronic device 1601 may be identified or authenticated.
- the wireless communication module 1692 may support a 5G network after a 4G network and a next-generation communication technology, for example, NR access technology (new radio access technology).
- NR access technologies include high-speed transmission of high-capacity data (enhanced mobile broadband (eMBB)), minimization of terminal power and access of multiple terminals (massive machine type communications (mMTC)), or high reliability and low latency (ultra-reliable and low latency (URLLC)). -latency communications)) can be supported.
- the wireless communication module 1692 may support a high frequency band (eg, mmWave band) to achieve a high data rate, for example.
- a high frequency band eg, mmWave band
- the wireless communication module 1692 uses various technologies for securing performance in a high frequency band, such as beamforming, massive multiple-input and multiple-output (MIMO), and full-dimensional multiplexing. Technologies such as input/output (FD-MIMO: full dimensional MIMO), array antenna, analog beam-forming, or large scale antenna may be supported.
- the wireless communication module 1692 may support various requirements defined for the electronic device 1601, an external electronic device (eg, the electronic device 1604), or a network system (eg, the second network 1699).
- the wireless communication module 1692 is capable of realizing peak data rate (eg, 20 Gbps or more) for realizing eMBB, loss coverage (eg, 164 dB or less) for realizing mMTC, or U-plane latency (for realizing URLLC).
- peak data rate eg, 20 Gbps or more
- loss coverage eg, 164 dB or less
- U-plane latency for realizing URLLC.
- DL downlink
- UL uplink each of 0.5 ms or less, or round trip 1 ms or less
- the antenna module 1697 may transmit or receive signals or power to the outside (eg, an external electronic device).
- the antenna module 1697 may include an antenna including a radiator formed of a conductor or a conductive pattern formed on a substrate (eg, PCB).
- the antenna module 1697 may include a plurality of antennas (eg, an array antenna). In this case, at least one antenna suitable for a communication method used in a communication network such as the first network 1698 or the second network 1699 is selected from the plurality of antennas by, for example, the communication module 1690. can be chosen A signal or power may be transmitted or received between the communication module 1690 and an external electronic device through the selected at least one antenna.
- other components eg, a radio frequency integrated circuit (RFIC) may be additionally formed as a part of the antenna module 1697 in addition to the radiator.
- RFIC radio frequency integrated circuit
- the antenna module 1697 may form a mmWave antenna module.
- the mmWave antenna module includes a printed circuit board, an RFIC disposed on or adjacent to a first surface (eg, a lower surface) of the printed circuit board and capable of supporting a designated high frequency band (eg, mmWave band); and a plurality of antennas (eg, array antennas) disposed on or adjacent to a second surface (eg, a top surface or a side surface) of the printed circuit board and capable of transmitting or receiving signals of the designated high frequency band. can do.
- peripheral devices eg, a bus, general purpose input and output (GPIO), serial peripheral interface (SPI), or mobile industry processor interface (MIPI)
- signal e.g. commands or data
- commands or data may be transmitted or received between the electronic device 1601 and the external electronic device 1604 through the server 1608 connected to the second network 1699 .
- Each of the external electronic devices 1602 or 1604 may be the same as or different from the electronic device 1601 .
- all or part of operations executed in the electronic device 1601 may be executed in one or more external electronic devices among the external electronic devices 1602 , 1604 , or 1608 .
- the electronic device 1601 when the electronic device 1601 needs to perform a certain function or service automatically or in response to a request from a user or another device, the electronic device 1601 instead of executing the function or service by itself.
- one or more external electronic devices may be requested to perform the function or at least part of the service.
- One or more external electronic devices receiving the request may execute at least a part of the requested function or service or an additional function or service related to the request, and deliver the execution result to the electronic device 1601 .
- the electronic device 1601 may provide the result as at least part of a response to the request as it is or after additional processing.
- cloud computing distributed computing, mobile edge computing (MEC), or client-server computing technology may be used.
- the electronic device 1601 may provide an ultra-low latency service using, for example, distributed computing or mobile edge computing.
- the external electronic device 1604 may include an internet of things (IoT) device.
- Server 1608 may be an intelligent server using machine learning and/or neural networks.
- the external electronic device 1604 or server 1608 may be included in the second network 1699.
- the electronic device 1601 may be applied to intelligent services (eg, smart home, smart city, smart car, or health care) based on 5G communication technology and IoT-related technology.
- An electronic device may be a device of various types.
- the electronic device may include, for example, a portable communication device (eg, a smart phone), a computer device, a portable multimedia device, a portable medical device, a camera, a wearable device, or a home appliance.
- a portable communication device e.g, a smart phone
- a computer device e.g., a smart phone
- a portable multimedia device e.g., a portable medical device
- a camera e.g., a camera
- a wearable device e.g., a smart bracelet
- first, second, or first or secondary may simply be used to distinguish a given component from other corresponding components, and may be used to refer to a given component in another aspect (eg, importance or order) is not limited.
- a (e.g., first) component is said to be “coupled” or “connected” to another (e.g., second) component, with or without the terms “functionally” or “communicatively.”
- the certain component may be connected to the other component directly (eg by wire), wirelessly, or through a third component.
- module used in one embodiment of this document may include a unit implemented in hardware, software, or firmware, and is interchangeable with terms such as, for example, logic, logical blocks, parts, or circuits.
- a module may be an integrally constructed component or a minimal unit of components or a portion thereof that performs one or more functions.
- the module may be implemented in the form of an application-specific integrated circuit (ASIC).
- ASIC application-specific integrated circuit
- One embodiment of this document is one or more instructions stored in a storage medium (eg, internal memory 1636 or external memory 1638) readable by a machine (eg, electronic device 1601). It may be implemented as software (eg, the program 1640) including them.
- a processor eg, the processor 1620 of a device (eg, the electronic device 1601) may call at least one command among one or more instructions stored from a storage medium and execute it. This enables the device to be operated to perform at least one function according to the at least one command invoked.
- the one or more instructions may include code generated by a compiler or code executable by an interpreter.
- the device-readable storage medium may be provided in the form of a non-transitory storage medium.
- the storage medium is a tangible device and does not contain a signal (e.g. electromagnetic wave), and this term refers to the case where data is stored semi-permanently in the storage medium. It does not discriminate when it is temporarily stored.
- a signal e.g. electromagnetic wave
- the method according to one embodiment disclosed in this document may be included and provided in a computer program product.
- Computer program products may be traded between sellers and buyers as commodities.
- a computer program product is distributed in the form of a device-readable storage medium (e.g. compact disc read only memory (CD-ROM)), or through an application store (e.g. Play StoreTM) or on two user devices (e.g. It can be distributed (eg downloaded or uploaded) online, directly between smart phones.
- a device-readable storage medium e.g. compact disc read only memory (CD-ROM)
- an application store e.g. Play StoreTM
- It can be distributed (eg downloaded or uploaded) online, directly between smart phones.
- at least part of the computer program product may be temporarily stored or temporarily created in a device-readable storage medium such as a manufacturer's server, an application store server, or a relay server's memory.
- each component (eg, module or program) of the above-described components may include a single object or a plurality of objects, and some of the plurality of objects may be separately disposed in other components. there is.
- one or more components or operations among the corresponding components described above may be omitted, or one or more other components or operations may be added.
- a plurality of components eg modules or programs
- the integrated component may perform one or more functions of each of the plurality of components identically or similarly to those performed by a corresponding component of the plurality of components prior to the integration. .
- the actions performed by a module, program or other component are executed sequentially, in parallel, iteratively, or heuristically, or one or more of the operations are executed in a different order, or omitted. or one or more other actions may be added.
- An electronic device (eg, the STA 301 of FIG. 3 or the electronic device 1601 of FIG. 16) according to an embodiment includes a wireless communication module configured to transmit and receive a wireless signal (eg, the wireless communication module 1692 of FIG. 16) and a processor operatively connected to the wireless communication module (eg, the processor 1620 of FIG. 16 ), and a memory electrically connected to the processor and storing instructions executable by the processor (eg, the processor 1620 of FIG. 16 ). 16 memory 1630), and when the instructions are executed by the processor, the processor, an access point (AP) (eg AP 401 of FIG. 3) and a plurality of links (eg FIG.
- AP access point
- the state of the links may be checked (eg, operation 1120 of FIG. 11 ), and the roaming operation may be differentiated and performed according to the state of the plurality of links (eg, operation 1130 of FIG. 11 ).
- the processor may determine whether the roaming is triggered by monitoring a parameter of the AP.
- the state may include one or more of the number of links associated with the roaming trigger, total link quality, and link quality of a designated link.
- the overall link quality and the link quality of the designated link may be based on the throughput of the link.
- the designated link may include a link for which roaming is not triggered.
- the number of links associated with the roaming trigger may be the number of links for which roaming is triggered or the number of links for which roaming is not triggered.
- the processor may differentiate and perform one or more of a roaming scan operation and an AP selection operation included in the roaming operation according to the state.
- the processor differentiates one or more of whether a roaming scan operation has started, a type of roaming scan, a period of the roaming scan, and whether or not data is used for a designated link according to the state, A scan operation can be performed.
- the processor may perform the AP selection operation by differentiating an AP selection criterion according to the state.
- the processor may be implemented as a communication processor or an application processor.
- An operating method of an electronic device includes an access point (AP) (eg, the AP 401 of FIG. 3 ) and a plurality of An operation of determining whether roaming is triggered by a roaming trigger while connected by forming links (eg, the plurality of links 410 to 430 of FIG. 4 ) (eg, operation 1110 of FIG. 11 ), and the roaming An operation of checking the status of the plurality of links in response to a trigger (eg, operation 1120 of FIG. 11 ) and an operation of differentiating and performing a roaming operation according to the status of the plurality of links (eg, operation 1130 of FIG. 11 ) can include
- the determining operation may include determining whether the roaming is triggered by monitoring a parameter of the AP.
- the state may include one or more of the number of links associated with the roaming trigger, total link quality, and link quality of a designated link.
- the overall link quality and the link quality of the designated link may be based on the throughput of the link.
- the designated link may include a link for which roaming is not triggered.
- the number of links associated with the roaming trigger may be the number of links for which roaming is triggered or the number of links for which roaming is not triggered.
- the operation of differentially performing the roaming operation may include an operation of differentially performing one or more of a roaming scan operation and an AP selection operation included in the roaming operation according to the state.
- the operation of discriminating one or more of the above according to the state may be selected from among whether a roaming scan operation has started, a type of roaming scan, a period of the roaming scan, and whether or not data is used for a designated link. It may include an operation of performing the roaming scan operation by differentiating one or more according to the state.
- the operation of performing the one or more discriminations according to the state may include an operation of performing the AP selection operation by differentiating an AP selection criterion according to the state.
- the operating method of the electronic device may be performed by a communication processor or an application processor.
- a method includes a plurality of links (eg, the STA 301 of FIG. 3 or the electronic device 1601 of FIG. 16 ) and an access point (eg, the AP 401 of FIG. 3 ).
- a parameter eg, RSSI
- Operations 1230, 1330, 1430, and 1530 of Figure 15 and an operation of evaluating links of the plurality of links in response to a determination that the parameter does not satisfy the threshold (eg, operation 1240 of FIGS. 12-15). 1340, 1440, 1540) and differentiating roaming operations (eg, operations 1250, 1350, 1450, and 1550 of FIGS. 12-15), wherein the evaluating operation checks the number of links on which roaming is triggered operation (eg operation 1240), determining the number of links for which roaming has not been triggered (eg operation 1340), calculating overall link quality (eg operation 1440), and calculating link quality (eg operation 1440). : operation 1540).
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Abstract
Description
| 1. 로밍 레벨 1 (1) 트리거된 링크(예: 제1 링크(410))의 밴드에 대해서만 부분 스캔 x회(예: 1회 이상) 진행 (2) 스캔된 AP 중 현재 연결된 AP(예: AP(401))의 RSSI보다 대체로 20dBm이상 좋은 AP를 선택하고, 선택된 AP 중에서 RSSI가 가장 좋은 AP로 로밍 진행 2. 로밍 레벨 2 (1) 트리거된 링크(예: 제1 링크(410), 제2 링크(420))에 대해 밴드별로 순차적으로(예: 대체로 6GHz를 대체로 5GHz보다 먼저 수행) 부분 스캔 수행(대체로 6GHz 또는 대체로 5GHz에 대해 스캔시, STA(301)가 대체로 2.4GHz 사용해서 통신 가능하기에 대체로 6GHz와 대체로 5GHz를 겹치지 않게 스캔함.) (2) 후보 AP가 발견되지 않은 경우 트리거되지 않은 링크(예: 제3 링크(430)(예: 대체로 2.4GHz))에 대해서도 순차적으로 부분 스캔 수행 (3) 제2 링크(420) 및/또는 제1 링크(410)에 대해 10초마다 순차적으로 부분 스캔 수행 (4) 로밍 스캔 수행 시 해당 링크(예: 로밍 스캔하는 링크)에 대해서는 데이터 사용 안함 (5) 스캔된 AP 중 현재 연결된 AP(예: AP(401))의 RSSI보다 대체로 10dBm이상 좋은 AP를 선택하고, 선택된 AP 중에서 RSSI가 가장 좋은 AP로 로밍 진행 3. 로밍 레벨 3 (1) 트리거되어 있는 링크(예: 제1 링크(410), 제2 링크(420), 제3 링크(430))에 대해 순차적으로 부분 스캔 수행하고, 후보 AP를 찾지 못한 경우 그 뒤로 전체 스캔 수행 (2) 제3 링크(430)에 대해서만 대체로 10초마다 부분 스캔 수행 (3) 로밍 스캔 수행 시 해당 링크(예: 스캔하는 링크)에 대해서는 데이터 사용 안함 (4) 스캔된 AP 중 현재 연결된 AP(예: AP(401))의 RSSI보다 대체로 10dBm이상 좋은 AP를 선택하고, 선택된 AP 중에서 RSSI가 가장 좋은 AP로 로밍 진행 |
Claims (15)
- 전자 장치에 있어서,무선 신호를 송수신하도록 구성된 무선 통신 모듈;상기 무선 통신 모듈과 작동적으로(operatively) 연결된 프로세서; 및상기 프로세서와 전기적으로 연결되고 상기 프로세서에 의해 실행 가능한 인스트럭션들을 저장하는 메모리를 포함하고,상기 프로세서에 의해 상기 인스트럭션들이 실행될 때, 상기 프로세서는,AP(access point)와 복수의 링크들을 형성하여 연결되어 있는 동안에 로밍 트리거에 의해 로밍의 트리거 여부를 판단하고,상기 로밍 트리거에 응답하여 상기 복수의 링크들의 상태를 확인하고,상기 복수의 링크들의 상태에 따라 로밍 동작을 차별화하여 수행하는, 전자 장치.
- 제1항에 있어서,상기 프로세서는,상기 AP에 대한 파라미터를 모니터링하여 상기 로밍의 트리거 여부를 판단하는, 전자 장치.
- 제1항 및 제2항 중 어느 한 항에 있어서,상기 상태는,상기 로밍 트리거에 연관된 링크의 개수, 전체 링크 퀄리티, 및 지정된 링크의 링크 퀄리티 중에서 하나 이상을 포함하는, 전자 장치.
- 제1항 내지 제3항 중 어느 한 항에 있어서,상기 전체 링크 퀄리티 및 상기 지정된 링크의 링크 퀄리티는,링크의 쓰루풋(throughput)에 기초하는 것인, 전자 장치.
- 제1항 내지 제4항 중 어느 한 항에 있어서,상기 지정된 링크는 로밍이 트리거되지 않은 링크를 포함하는, 전자 장치.
- 제1항 내지 제5항 중 어느 한 항에 있어서,상기 로밍 트리거에 연관된 링크의 개수는,상기 로밍이 트리거된 링크의 개수 또는 상기 로밍이 트리거되지 않은 링크의 개수인, 전자 장치.
- 제1항 내지 제6항 중 어느 한 항에 있어서,상기 프로세서는,상기 로밍 동작에 포함된 로밍 스캔 동작 및 AP 선택 동작 중에서 하나 이상을 상기 상태에 따라 차별화하여 수행하는, 전자 장치.
- 제1항 내지 제7항 중 어느 한 항에 있어서,상기 프로세서는,로밍 스캔 동작의 시작 여부, 로밍 스캔의 종류, 로밍 스캔의 기간(period), 및 지정된 링크에 대한 데이터 사용 유무 중에서 하나 이상을 상기 상태에 따라 차별화하여 상기 로밍 스캔 동작을 수행하는, 전자 장치.
- 제1항 내지 제8항 중 어느 한 항에 있어서,상기 프로세서는,AP 선택 기준을 상기 상태에 따라 차별화하여 상기 AP 선택 동작을 수행하는, 전자 장치.
- 제1항 내지 제9항 중 어느 한 항에 있어서,상기 프로세서는,통신 프로세서 또는 애플리케이션 프로세서로 구현되는, 전자 장치.
- 전자 장치의 동작 방법에 있어서,AP(access point)와 복수의 링크들을 형성하여 연결되어 있는 동안에 로밍 트리거에 의해 로밍의 트리거 여부를 판단하는 동작;상기 로밍 트리거에 응답하여 상기 복수의 링크들의 상태를 확인하는 동작; 및상기 복수의 링크들의 상태에 따라 로밍 동작을 차별화하여 수행하는 동작을 포함하는, 전자 장치의 동작 방법.
- 제11항에 있어서,상기 판단하는 동작은,상기 AP에 대한 파라미터를 모니터링하여 상기 로밍의 트리거 여부를 판단하는 동작을 포함하는, 전자 장치의 동작 방법.
- 제11항 및 제12항 중 어느 한 항에 있어서,상기 상태는,상기 로밍의 트리거에 연관된 링크의 개수, 전체 링크 퀄리티, 및 지정된 링크의 링크 퀄리티 중에서 하나 이상을 포함하는, 전자 장치의 동작 방법.
- 제11항 내지 제13항 중 어느 한 항에 있어서,상기 전체 링크 퀄리티 및 상기 지정된 링크의 링크 퀄리티는,링크의 쓰루풋(throughput)에 기초하는 것인, 전자 장치의 동작 방법.
- 제11항 내지 제14항 중 어느 한 항에 있어서,상기 지정된 링크는 로밍이 트리거되지 않은 링크를 포함하는, 전자 장치의 동작 방법.
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| EP22920760.0A EP4418740A4 (en) | 2022-01-14 | 2022-10-12 | ELECTRONIC DEVICE AND ROAMING METHODS |
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