WO2018082771A1 - Dispositif client (sta) utilisant un paquet de réveil pour une décision de sélection de canal - Google Patents

Dispositif client (sta) utilisant un paquet de réveil pour une décision de sélection de canal Download PDF

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Publication number
WO2018082771A1
WO2018082771A1 PCT/EP2016/076504 EP2016076504W WO2018082771A1 WO 2018082771 A1 WO2018082771 A1 WO 2018082771A1 EP 2016076504 W EP2016076504 W EP 2016076504W WO 2018082771 A1 WO2018082771 A1 WO 2018082771A1
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WO
WIPO (PCT)
Prior art keywords
channel
sta
information
association
channel selection
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PCT/EP2016/076504
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English (en)
Inventor
Genadiy Tsodik
Shimon SHILO
Doron Ezri
Avi WEITZMAN
Oded Redlich
Ming GAN
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Huawei Technologies Co., Ltd.
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Publication date
Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Priority to PCT/EP2016/076504 priority Critical patent/WO2018082771A1/fr
Publication of WO2018082771A1 publication Critical patent/WO2018082771A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/02—Power saving arrangements
    • H04W52/0209—Power saving arrangements in terminal devices
    • H04W52/0225—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal
    • H04W52/0229—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal where the received signal is a wanted signal
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • Client device using wake-up packet for channel selection decision
  • the present disclosure relates to a client device (STA) using a wake-up packet (WUP) for channel selection decision and an access point device (AP) transmitting such wake-up packet.
  • the disclosure further relates to a method and a device for wake-up signal based channel selection, in particular for client devices, access-point devices and/or machine- type communication devices of wireless communication networks, for example according to the 802.1 1 ax WiFi standard or according to the 3GPP LTE (Long Term Evolution) standard.
  • STAs stations
  • Channel the search process is a part of the channel selection procedure.
  • Channel selection can be a very long procedure (especially during initial association) that requires a number of trials and iterations, till the relevant network is obtained.
  • loT Internet of Things
  • the power resources of a station are limited.
  • an initial network search can be crucial for total power consumption budget.
  • the next generation of wireless networks introduce a wake-up packet (WUP) transmitted by the Access Point (AP). This signal allows a STA to stay in a very low power consumption mode until it is triggered by a WUP and needs to switch to a regular mode for data exchange with an AP.
  • WUP wake-up packet
  • AP Access Point
  • WUP format Current discussions regarding WUP format are mostly focusing on a trigger that can be recognized by the STA in order to switch to normal operating mode. This allows a STA to stay in a very low power operational mode as long as no data is required to be sent or received. This also allows a STA to perform an initial scan in a low power mode before the association procedure is initialized.
  • Figure 1 illustrates the regular channel scan 100.
  • the STA is scanning a network to find a broadcasted signal 102 or trying to transmit at every frequency until the relevant response is received. Assuming the broadcast signal 102 contains enough information to decide on the association, STA starts association 106 after first broadcast signal is detected. All the process is performed in regular power mode which leads to a high power consumption.
  • Figure 2 illustrates the channel scan using WUP 200. Assuming WUP can be used for the initial scan, Figure 2 depicts an example of channel selection procedure.
  • a STA starts scanning 201 from some frequency.
  • a primary modem is switched on 203, however STA cannot predict if there will be a trigger for association data 204.
  • timeout 205 STA switches 206 to the next channel and performs the same procedure 207, 208, 209, 210. It can easily be understood that in the worst case a very long period of time could be wasted before the relevant channel is found 212. Moreover, during at least part of this period the STA is working in regular power mode which significantly increases the power consumption.
  • Random access is a procedure that allows client type communication devices to request from an access point (AP) type communication device resources for transmission by use of a resource request and by another procedure to initiate an association procedure with the AP.
  • this mechanism is usually applied by the client devices that need to request the resources.
  • the client devices can achieve an association with a specific AP.
  • RA is applied immediately after a trigger frame (TF), which is transmitted by the AP.
  • TF trigger frame
  • a TF frame may be followed by several RA opportunities. Within each opportunity, clients can try to access the channel. For doing so they contend with each other.
  • the devices and methods described herein may be configured to communicate using MAC based RA.
  • the RA is transmitted as regular data, including payload, where each client allocates its transmission within a single resource unit (RU) as defined in 802.1 1 ax.
  • a RU is defined as a set of continuous subcarriers, e.g. 26, over some period of time.
  • the AP can decide to provide more than one RA frame triggered by a single TF.
  • the specific frame and the RU within the frame can be chosen in a random way by each client type communication device. No distinguishing between the non- associated client type communication devices and associated client type communication devices is introduced and all the client type communication devices that try to transmit an RA, are allowed to choose any time/frequency resources allocated for the current RA opportunity.
  • a random access block typically comprises a plurality of frequency subcarriers and a plurality of time slots.
  • a frequency section comprises at least one such frequency subcarrier but typically a plurality of neighboring (the spacing between two neighboring frequency subcarriers depends on what is defined by the underlying communication system) frequency subcarriers.
  • the devices and methods described herein may be configured to communicate using PHY based RA.
  • PHY based RA is transmitted as PHY signaling and does not include any higher layer (MAC or above) payload.
  • MAC higher layer
  • the RA data is thus very short and allows a higher number of client type communication devices to be allocated within a single RA frame.
  • the devices described herein may be machine type communication devices. Machine
  • MTC Type Communication
  • M2M Machine to machine
  • communication can include industrial instrumentation, enabling a sensor or meter to communicate the data it records (such as temperature, inventory level, etc.) to application software that can use it (for example, adjusting an industrial process based on temperature).
  • a sensor or meter to communicate the data it records (such as temperature, inventory level, etc.) to application software that can use it (for example, adjusting an industrial process based on temperature).
  • application software for example, adjusting an industrial process based on temperature).
  • the methods and devices described herein may be implemented in wireless
  • the methods and devices described below may further be implemented in a base station (NodeB, eNodeB) or a mobile device (or mobile station or User Equipment (UE)).
  • NodeB, eNodeB a base station
  • UE User Equipment
  • the described devices may include integrated circuits and/or passives and may be manufactured according to various technologies.
  • the circuits may be designed as logic integrated circuits, analog integrated circuits, mixed signal integrated circuits, optical circuits, memory circuits and/or integrated passives.
  • the devices described herein may be configured to transmit and/or receive radio signals.
  • Radio signals may be or may include radio frequency signals radiated by a radio transmitting device (or radio transmitter or sender) with a radio carrier frequency lying in a range of about 3 kHz to 300 GHz.
  • the frequency range may correspond to frequencies of alternating current electrical signals used to produce and detect radio waves.
  • OFDM and OFDMA are schemes for encoding digital data on multiple carrier frequencies.
  • a large number of closely spaced orthogonal sub-carrier signals may be used to carry data. Due to the orthogonality of the sub-carriers crosstalk between sub- carriers may be suppressed.
  • STA Station, also referred to as client device
  • Access Point also referred to as access point device
  • TFR Trigger Frame for RA
  • OFDM Orthogonal Frequency Division Multiplexing
  • OFDMA Orthogonal Frequency Division Multiple Access
  • PHY Physical layer (device)
  • the invention relates to a client device (STA) for STA.
  • STA client device
  • the STA comprising: a transceiver, configured to: receive a wake-up packet (WUP) indicating the STA to switch from a low power operation mode to a regular power operation mode, wherein the WUP comprises channel selection information for assisting the STA in a channel selection decision.
  • WUP wake-up packet
  • the STA can maximize the working period in low power mode during the initial scan and reduce the power consumption.
  • the channel selection procedure can be improved saving time and power.
  • the channel selection information comprises information of a frequency bandwidth supported by the AP for association with the STA.
  • channel selection information to indicate information of a frequency bandwidth supported by the AP for association with the STA allows the STA to directly move its local oscillator frequency to the frequency bandwidth supported by the AP without searching the correct frequency bandwidth in a long searching procedure. Thus time and power can be saved.
  • the channel selection information comprises at least one of channel specification information, channel availability information and channel suggestion information.
  • the channel selection information includes channel specification information, channel availability information and/or channel suggestion information
  • the current channel supported by the AP can be specified, its availability can be indicated or the STA can be directed to another channel supported by the AP. This accelerates the initialization procedure and hence saves time and resources.
  • the channel specification information comprises at least one of: an indication whether a current communication channel of the AP is a Primary Channel or not, in particular a yes or no indication, a channel number of a current communication channel of the AP, and a location of the current communication channel of the AP relative to a predetermined communication channel, in particular relative to the Primary Channel.
  • Such information facilitates the channel selection procedure by indicating the STA whether a current communication channel of the AP is a Primary Channel or not, by indicating the STA a channel number of a current communication channel of the AP, and by indicating the STA a location of the current communication channel of the AP relative to a predetermined communication channel, e.g. relative to the Primary Channel.
  • the STA can save time and power.
  • the channel availability information comprises information if the AP accepts a new STA for an association, in particular a yes or no indication.
  • the STA When the STA knows if the AP accepts a new STA it can continue its channel selection procedure, otherwise it can interrupt the current channel selection procedure and start searching for another AP. This improves the channel initialization. In particular a yes or no indication is highly efficient saving time and bandwidth resources.
  • the channel suggestion information comprises information, in particular a channel number, on which communication channel the AP accepts a new STA for an association.
  • Such information helps the STA to find the correct channel on which the AP is available for an association, thereby saving time and power consumption.
  • the channel suggestion information comprises information, in particular a channel number, on which communication channel another AP accepts a new STA for an association. Such information helps the STA to quickly find another AP, in particular a channel on which another AP is available for an association, thereby saving time and power consumption.
  • the invention relates to an access point device (AP) for communicating with a client device (STA), the AP comprising: a transceiver, configured to: transmit a wake-up packet (WUP) indicating the STA to switch from a low power operation mode to a regular power operation mode, wherein the WUP comprises channel selection information for assisting the STA in a channel selection decision.
  • AP access point device
  • STA client device
  • the AP comprising: a transceiver, configured to: transmit a wake-up packet (WUP) indicating the STA to switch from a low power operation mode to a regular power operation mode, wherein the WUP comprises channel selection information for assisting the STA in a channel selection decision.
  • WUP wake-up packet
  • channel selection information By using such channel selection information, unnecessary trial of association can be prevented and the time required for completing an initial scan and association can be minimized.
  • Using channel selection information allows prior knowledge to decide on association initialization.
  • the STA can maximize the working period in low power mode during the initial scan and reduce the power consumption. Thus, the channel selection procedure can be improved saving time and power.
  • the channel selection information comprises information of a frequency bandwidth supported by the AP for association with the STA.
  • channel selection information to indicate information of a frequency bandwidth supported by the AP for association with the STA allows the STA to directly move its local oscillator frequency to the frequency bandwidth supported by the AP without searching the correct frequency bandwidth in a long searching procedure. Thus time and power can be saved.
  • the channel selection information comprises at least one of channel specification information, channel availability information and channel suggestion information.
  • the channel specification information comprises at least one of: an indication whether a current communication channel of the AP is a Primary Channel or not, in particular a yes or no indication, a channel number of a current communication channel of the AP, and a location of the current communication channel of the AP relative to a predetermined communication channel, in particular relative to the Primary Channel.
  • Such information facilitates the channel selection procedure by indicating the STA whether a current communication channel of the AP is a Primary Channel or not, by indicating the STA a channel number of a current communication channel of the AP, and by indicating the STA a location of the current communication channel of the AP relative to a predetermined communication channel, e.g. relative to the Primary Channel.
  • the STA can save time and power.
  • the channel availability information comprises information if the AP accepts a new STA for an association, in particular a yes or no indication.
  • the STA When the STA knows if the AP accepts a new STA it can continue its channel selection procedure, otherwise it can interrupt the current channel selection procedure and start searching for another AP. This improves the channel initialization.
  • the channel suggestion information comprises information, in particular a channel number, on which communication channel the AP accepts a new STA for an association.
  • the channel suggestion information comprises information, in particular a channel number, on which communication channel another AP accepts a new STA for an association.
  • the invention relates to a method for assisting a client device (STA) in a channel selection decision, the method comprising: receiving a wake-up packet (WUP), from an AP, indicating the STA to switch from a low power operation mode to a regular power operation mode, wherein the WUP comprises channel selection information for assisting the STA in a channel selection decision.
  • WUP wake-up packet
  • channel selection information By using such channel selection information, unnecessary trial of association can be prevented and the time required for completing an initial scan and association can be minimized.
  • Using channel selection information allows prior knowledge to decide on association initialization.
  • the STA can maximize the working period in low power mode during the initial scan and reduce the power consumption. Thus, the channel selection procedure can be improved saving time and power.
  • Fig. 1 shows a time diagram illustrating a regular channel scan 100 as performed by a STA
  • Fig. 2 shows a time diagram illustrating a channel scan using a wake-up packet (WUP) 200 as performed by a STA;
  • WUP wake-up packet
  • Fig. 3 shows a schematic diagram illustrating an exemplary wake-up packet (WUP) 300 with Channel Selection Info 303 according to an implementation form
  • Fig. 4 shows a schematic time-frequency diagram illustrating a channel information example 400 according to an implementation form
  • Fig. 5 shows a schematic time-frequency diagram illustrating a channel availability example 500 according to an implementation form
  • Fig. 6 shows a block diagram illustrating a STA 600 according to an implementation form
  • Fig. 7 shows a block diagram illustrating an AP 700 according to an implementation form
  • Fig. 8 shows a schematic diagram illustrating a method 800 for assisting a client device (STA) in a channel selection decision according to an implementation form.
  • Fig. 3 shows a schematic diagram illustrating an exemplary wake-up packet (WUP) 300 with Channel Selection Info 303 according to an implementation form.
  • This WUP 300 may include a section including a WUP preamble 301 , a section including WUP data 302, a section including channel selection information 303 and a section including an error correction code 304, e.g. a cyclic redundancy check over the whole packet 300 or over part of the packet 300.
  • the section including the channel selection information 303 is information added to the WUP 300 that can assist a STA in the decision of channel selection.
  • the main problem is an absence of the prior knowledge regarding the network
  • the channel selection information 303 added to the WUP 300 may include one or more of the following information: Channel specification information, Channel availability information, and Channel suggestion information. Then, AP can set the information according to network status. STA can use the information to decide regarding association procedure initialization with higher probability to complete it (within a relatively short time). The disclosed method can provide important information for assisting STAs with respect to the decision on channel selection and therefore shorten the time required to complete an initial scan and association procedure.
  • Fig. 4 shows a schematic time-frequency diagram illustrating a channel information example 400 according to an implementation form.
  • the time-frequency diagram illustrates the full 2.4/5G band 510 and a section thereof indicating the supported bandwidth (BW) 51 1 .
  • This supported BW 51 1 includes the primary channel 501 , e.g. having the channel number 0, a detected channel 502, e.g. having the channel number 4 and further channels up to a channel number 8.
  • Fig. 5 shows a schematic time-frequency diagram illustrating a channel availability example 500 according to an implementation form.
  • the time-frequency diagram illustrates the full 2.4/5G band 510 and a section thereof indicating the supported bandwidth (BW) 51 1 .
  • This supported BW 51 1 includes the primary channel 501 , e.g. having the channel number 0, a detected channel 502, e.g. having the channel number 4 and further channels available for association 503, e.g. channels up to a channel number 8.
  • the main question is whether it is possible for the AP to accept a new STA to the network. It can be provided by a simple YES/NO indication (in the channel availability information). If NO is indicated, STA will continue scanning without trying to send AP an association data.
  • an AP If an AP is not available for association on the specific channel 502 but can accept a new STA on another channel 503 supported by this AP, it can indicate where to search for the available channel (by using channel suggestion information, see Fig. 5). For example, the AP can indicate to the STA that the current channel 502 is number 4, and the STA should associate on channel number 8.
  • the updated procedure can for example include the following steps: Scan channels till WUP is received; Decode the provided information; Check the availability for the association; If association is allowed start association on this channel; If association is not allowed, check if there is another channel available (e.g. suggested channel); If yes switch to the indicated channel; If no continue on scanning; If no availability for the association: continue on scanning.
  • Fig. 6 shows a block diagram illustrating a STA 600 according to an implementation form.
  • the STA 600 may be used for communicating with an access point device (AP), e.g. an AP 700 as described below with respect to Fig. 7.
  • the STA 600 includes a transceiver 601 .
  • the transceiver 601 is configured to receive a wake-up packet (WUP), e.g. a WUP 300 as described above with respect to Fig. 3.
  • WUP 300 indicates the STA 600 to switch from a low power operation mode to a regular power operation mode.
  • the WUP 300 includes channel selection information 303 for assisting the STA 600 in a channel selection decision.
  • WUP wake-up packet
  • the channel selection information 303 may include information of a frequency bandwidth supported by the AP 700 for association with the STA 600, e.g. frequency bandwidth information 51 1 as described above with respect to Figures 4 and 5.
  • the channel selection information 303 may include channel specification information, channel availability information and/or channel suggestion information.
  • the channel specification information may include an indication whether a current communication channel of the AP 700 is a Primary Channel or not, in particular a yes or no indication, e.g. as described above with respect to Figures 4 and 5.
  • the channel specification information may include a channel number of a current communication channel of the AP 700, e.g. as described above with respect to Figures 4 and 5.
  • the channel specification information may include a location of the current communication channel of the AP 700 relative to a predetermined communication channel, in particular relative to the Primary Channel, e.g. as described above with respect to Figures 4 and 5.
  • the channel availability information may include information if the AP 700 accepts a new STA 600 for an association, in particular a yes or no indication, e.g. as described above with respect to Figures 4 and 5.
  • the channel suggestion information may include information, in particular a channel number, on which communication channel the AP 700 accepts a new STA 600 for an association, e.g. as described above with respect to Figures 4 and 5.
  • the channel suggestion information may include information, in particular a channel number, on which communication channel another AP accepts a new STA 600 for an association, e.g. as described above with respect to Figures 4 and 5.
  • Fig. 7 shows a block diagram illustrating an AP 700 according to an implementation form.
  • the AP 700 may be used for communicating with a client device (STA), e.g. a STA 600 as described above with respect to Fig. 6.
  • STA client device
  • the AP 700 includes a transceiver 701.
  • the transceiver 701 is configured to transmit a wake-up packet (WUP), e.g. a WUP 300 as described above with respect to Fig. 3, indicating the STA 600 to switch from a low power operation mode to a regular power operation mode.
  • WUP 300 includes channel selection information 303 for assisting the STA 600 in a channel selection decision, e.g. channel selection information 303 as described above with respect to Fig. 3.
  • the channel selection information 303 may include information of a frequency bandwidth supported by the AP 700 for association with the STA 600, e.g. frequency bandwidth information 51 1 as described above with respect to Figures 4 and 5.
  • the channel selection information 303 may include channel specification information, channel availability information and/or channel suggestion information.
  • the channel specification information may include an indication whether a current communication channel of the AP 700 is a Primary Channel or not, in particular a yes or no indication, e.g. as described above with respect to Figures 4 and 5.
  • the channel specification information may include a channel number of a current communication channel of the AP 700, e.g. as described above with respect to Figures 4 and 5.
  • the channel specification information may include a location of the current communication channel of the AP 700 relative to a predetermined communication channel, in particular relative to the Primary Channel, e.g. as described above with respect to Figures 4 and 5.
  • the channel availability information may include information if the AP 700 accepts a new STA 600 for an association, in particular a yes or no indication, e.g. as described above with respect to Figures 4 and 5.
  • the channel suggestion information may include information, in particular a channel number, on which communication channel the AP 700 accepts a new STA 600 for an association, e.g. as described above with respect to Figures 4 and 5.
  • the channel suggestion information may include information, in particular a channel number, on which communication channel another AP accepts a new STA 600 for an association, e.g. as described above with respect to Figures 4 and 5.
  • Fig. 8 shows a schematic diagram illustrating a method 800 for assisting a client device (STA) in a channel selection decision according to an implementation form.
  • the STA may be a STA 600 as described above with respect to Fig. 6.
  • the method 800 includes:
  • a wake-up packet e.g. a WUP 300 as described above with respect to Fig. 3, from an AP, e.g. an AP 700 as described above with respect to Fig. 7, indicating the STA 600 to switch from a low power operation mode to a regular power operation mode
  • the WUP 300 comprises channel selection information for assisting the STA 600 in a channel selection decision, e.g. channel selection information 303 as described above with respect to Fig. 3 for assisting the STA 600 in a channel selection decision as described above with respect to Figures 4 and 5.
  • the present disclosure also supports a computer program product including computer executable code or computer executable instructions that, when executed, causes at least one computer to execute the performing and computing steps described herein, in particular the step of the method 800 described above.
  • a computer program product may include a readable non-transitory storage medium storing program code thereon for use by a computer.
  • the program code may perform the performing and computing steps described herein, in particular the method 800 described above. While a particular feature or aspect of the disclosure may have been disclosed with respect to only one of several implementations, such feature or aspect may be combined with one or more other features or aspects of the other implementations as may be desired and advantageous for any given or particular application.

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

Abstract

L'invention concerne un dispositif client (STA) (600) conçu pour communiquer avec un dispositif de point d'accès (AP) (700), le STA (600) comprenant un émetteur-récepteur (601) configuré pour : recevoir un paquet de réveil (WUP) (300) indiquant au STA (600) de passer d'un mode de fonctionnement à faible puissance à un mode de fonctionnement à puissance régulière, le WUP (300) comprenant des informations de sélection de canal (303) permettant d'aider le STA (600) dans une décision de sélection de canal. L'invention concerne en outre un dispositif de point d'accès (AP) (700) conçu pour communiquer avec un dispositif client (STA) (600), l'AP comprenant un émetteur-récepteur (701) configuré pour : émettre un paquet de réveil (WUP) (300) indiquant au STA (600) de passer d'un mode de fonctionnement à faible puissance à un mode de fonctionnement à puissance régulière, le WUP (300) comprenant des informations de sélection de canal (303) permettant d'aider le STA (600) dans une décision de sélection de canal.
PCT/EP2016/076504 2016-11-03 2016-11-03 Dispositif client (sta) utilisant un paquet de réveil pour une décision de sélection de canal WO2018082771A1 (fr)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011162197A1 (fr) * 2010-06-22 2011-12-29 シャープ株式会社 Système de communication sans fil, dispositif de station de base et procédé de communication
US20140269481A1 (en) * 2010-06-25 2014-09-18 Cisco Technology, Inc. Automating radio enablement to facilitate power saving
US20160128128A1 (en) * 2014-11-04 2016-05-05 Qualcomm Incorporated Low power discontinuous reception with a second receiver

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011162197A1 (fr) * 2010-06-22 2011-12-29 シャープ株式会社 Système de communication sans fil, dispositif de station de base et procédé de communication
US20140269481A1 (en) * 2010-06-25 2014-09-18 Cisco Technology, Inc. Automating radio enablement to facilitate power saving
US20160128128A1 (en) * 2014-11-04 2016-05-05 Qualcomm Incorporated Low power discontinuous reception with a second receiver

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