CN103944796A - Interconnection system and switching method for long term evolution (LTE) and visible light communication (VLC) - Google Patents
Interconnection system and switching method for long term evolution (LTE) and visible light communication (VLC) Download PDFInfo
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Abstract
The invention provides an interconnection system and a switching method for long term evolution (LTE) and visible light communication (VLC). A coordinator in a VLC framework is led into the LTE by the system and acts at an interface for accessing the VLC to the LTE. At the LTE side, the coordinator is maintained to be transparent to the LTE side with functions of common base stations. At the VLC side, the coordinator can control an access point (AP) of the VLC. Switching between the LTE and the VLC is realized via the coordinator, and the process of switching between the LTE and the VLC is realized by adopting an X2 interface.
Description
Technical field
The present invention relates to interconnecting and switching control problem of different system, relate in particular to LTE(3GPP long evolving system) and VLC(visible light communication) interconnected systems framework and under this framework the changing method of dual-mode terminal between two kinds of networks.
Background technology
In the decades in past, radio communication, especially mobile communication have obtained huge progress, have met general access demand, and our quality of daily life is also improved simultaneously.But, Development of Wireless Communications is subject to the restriction of microwave frequency band frequency spectrum resource anxiety, in existing frequency range, improve bandwidth by technological improvement, effect is limited, thereby there is successively in recent years the millimetre-wave attenuator study hotspot such as communicate by letter with Terahertz, all be intended to frequency range used radio communication to expand to higher frequency direction, to improve transmission bandwidth.And along with the appearance of white light LED part, utilizing visible light frequency band that frequency is higher to carry out radio communication becomes possibility, not only can reach in theory higher transmission rate, has avoided nervous wireless authorization wave band simultaneously.On the other hand, white light LED part is called as green solid light source of future generation, have lower power consumption, higher brightness and less size compared with fluorescence light source, its light sending can be used as carrier (boc) modulated signals simultaneously, thereby has realized green illumination and energy-conservation combination of communicating by letter.In addition, the light wave of visible light frequency band without injury, can ensure the Environmental Safety under long-time communication to human body.The maximum advantage of visible light communication (VLC) is that green light source LED is installed on ceiling, takes into account illumination simultaneously and communicates by letter, energy-efficient.
3GPP Long Term Evolution (LTE) project is the maximum new technology development project that 3GPP starts over the past two years, and this technology taking OFDM/FDMA as core has been listed in 4G technology.Compared with 3G, LTE has more technical advantage, is embodied in: high data rate, grouping transmission, latency reduction, wide area cover and be backward compatible.LTE project is the evolution of 3G, and it improves and strengthened the aerial access technology of 3G, adopts OFDM and the MIMO sole criterion as its wireless network evolution.
What adopt for the research major part of heterogeneous network at present is the connected mode of the loose coupling based on mobile IP technology.For example Chinese patent application CN2007101615.78(" method, network entity and the terminal switched between a kind of heterogeneous wireless network ", Huawei Tech Co., Ltd, on September 29th, 2007) a kind of switch between heterogeneous wireless network method has been proposed, realize the quick switching problem of heterogeneous network.The method comprises pre-authentication information required when mobile node is determined with certification, and mobile node, according to determined pre-authentication information, is initiated the pre-authentication of objective network, and after pre-authentication passes through, mobile node switches between heterogeneous network.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of method interconnecting that realizes between LTE and VLC network.The technical solution adopted for the present invention to solve the technical problems is:
1. an interconnection system of LTE and VLC, this system comprises Mobility Management Entity (MME), gateway (SGW), and multiple LTE base station and multiple VLC access point; Between each LTE base station, utilize interface to be connected, MME is connected with SGW, and MME is all connected with each LTE base station with SGW, and dual-mode terminal is by LTE wave point and LTE base station communication; It is characterized in that, this system also comprises telegon, and telegon is connected with MME, S-GW and each LTE base station and each VLC access point respectively;
In LTE side, telegon is for realizing the function identical with LTE base station; In VLC side, telegon is the nucleus equipment for configuring and managing; Telegon is linked into the interface of LTE as VLC, for the buffer memory to data, exchange and management; The data that send to LTE base station are forwarded; Mobility between VLC access point (AP) is managed; In the time that LTE and VLC switch, telegon encapsulates the signaling of LTE and data, is that signaling and data become the form that can transmit on VLC;
Telegon is connected with MME by S1 interface, and telegon is connected with SGW by S1 interface, and telegon is connected with each LTE base station by X2 interface, and telegon communicates by 802.15.7 agreement and VLC access point, as shown in Figure 1.
2. this system comprises the switching of dual-mode terminal from LTE to VLC, it is characterized in that, the switching from LTE to VLC comprises that steps A 1 is to A8, as shown in Figure 2:
1) steps A 1, when the current service network of dual-mode terminal is LTE, and detects the signal of VLC access point, and dual-mode terminal sends measurement report according to the measurement rules of LTE base station instruction to LTE base station; Measurement rules comprises the content of measuring the trigger condition, measuring period and the measurement report that report, and the content of measurement report comprises cell ID and cell signal quality;
2) steps A 2, handover decisions is analyzed and done in LTE base station by the measurement report of reporting of user; When meeting after the access point that is switched to VLC, handover request is sent to telegon by LTE base station, then proceeds to steps A 3, otherwise finish handoff procedure;
3) steps A 3, telegon receives after handover request, telegon is set up and is contacted by the VLC access point of reporting with measurement report, obtains available resources and the load information of VLC access point, and does to receive and control;
4) steps A 4, telegon is according to receiving control result that handover request ack message is returned to LTE base station, and LTE base station sends to dual-mode terminal according to handover request ack message by switching zero setting, and handover request ack message comprises allowing to switch or refusing to be switched;
5) steps A 5, the switching command obtaining when dual-mode terminal is that while allowing switching, dual-mode terminal will carry out the access procedure defining in VLC agreement with VLC access point; LTE carries out base station to switch and prepares and the buffer memory data to dual-mode terminal to be sent, is forwarded to telegon simultaneously;
6) steps A 6, when dual-mode terminal completes after the access procedure of VLC access point, sends to switch to telegon and confirms request, and telegon is made switching and confirmed response simultaneously;
7) steps A 7, in the time that telegon receives the handoff completion message of terminal, telegon reports handoff completion message to MME, and MME reports S-GW by handoff completion message and asks user's face to upgrade, and it is mainly that downlink path is switched in requirement that user's face upgrades; S-GW completes after the switching of lower path, thinks that MME sends user's face and upgrades feedback, and MME receives after the renewal of user's face is fed back and sends and switched response to virtual machine station;
8) steps A 8, telegon receives and has switched after response, sends resource release order to LTE base station, and LTE base station discharges the resource relevant to dual-mode terminal; Last telegon is transferred to dual-mode terminal by data cached by VLC access point, realizes the harmless transmission of data;
3. this system also comprises the switching of dual-mode terminal from VLC to LTE, it is characterized in that, the switching from VLC to LTE comprises that step B1 is to B8, as shown in Figure 3;
1) step B1, when the current service network of dual-mode terminal is VLC, and the signal of LTE base station detected, dual-mode terminal sends measurement report according to the measurement rules of telegon instruction to telegon, measurement rules comprises measures the trigger condition that reports and the content of measurement report; The content of measurement report comprises little distinctive emblem, cell signal quality;
2) step B2, handover decisions is analyzed and done to telegon by the measurement report of reporting of user; When meeting after switching condition, handover request is sent to LTE base station by telegon, then proceeds to step B3, otherwise exponent number handoff procedure;
3) step B3, LTE receives base station after handover request, does to receive control according to the relevant information such as available resources and load of self;
4) step B4, LTE base station is according to receiving control result that handover request ack message is returned to telegon, and telegon sends to dual-mode terminal according to handover request ack message by hand off signaling;
5) step B5, the switching command obtaining when dual-mode terminal is while allowing switching, dual-mode terminal and the impromptu access procedure of synchronizeing in LTE base station, otherwise stop this handoff procedure; Telegon is carried out to switch and is prepared and the buffer memory data to dual-mode terminal to be sent, is forwarded to LTE base station simultaneously;
6) step B6, when dual-mode terminal completes after the access procedure of LTE base station, sends switch acknowledgment message to LTE base station;
7) step B7, in the time that LTE base station receives the handoff completion message of terminal, LTE base station reports handoff completion message to MME, and MME reports S-GW by handoff completion message and asks user's face to upgrade, and it is mainly that downlink path is switched in requirement that user's face upgrades; S-GW completes after downlink path switching, upgrades feedback to MME transmission user face, and MME receives and switched corresponding to the transmission of LTE base station after the renewal of user's face is fed back;
8) step B8, LTE base station receive switched corresponding after, send resource to telegon and release order, telegon discharges the VLC side resource relevant to dual-mode terminal; Last LTE base station is by the data cached dual-mode terminal that is transferred to.
4. by introducing telegon, set it as VLC the interface that is linked into LTE.In LTE side, telegon keeps transparent to LTE, has the function of general LTE base station.In VLC side, telegon can be controlled the access point of VLC.Switching between LTE and VLC realizes by telegon.The advantage of this method is for LTE, and handoff procedure and LTE handoff procedure are consistent, very little on existing LTE impact.VLC is connected to LTE in the tightly coupled mode of one.
brief description of the drawings
Fig. 1 is the functional block diagram of the interconnection system of LTE and VLC
Fig. 2 is the hand off signaling flow chart of dual-mode terminal from LTE to VLC
Fig. 3 is the hand off signaling flow chart of dual-mode terminal from VLC to LTE.
Claims (3)
1. an interconnection system of LTE and VLC, this system comprises Mobility Management Entity (MME), gateway (SGW), and multiple LTE base station and multiple VLC access point; Between each LTE base station, utilize interface to be connected, MME is connected with SGW, and MME is all connected with each LTE base station with SGW, and dual-mode terminal is by LTE wave point and LTE base station communication; It is characterized in that, this system also comprises telegon, and telegon is connected with MME, S-GW and each LTE base station and each VLC access point respectively; In LTE side, telegon is for realizing the function identical with LTE base station; In VLC side, telegon is the nucleus equipment for configuring and managing; Telegon is linked into the interface of LTE as VLC, for the buffer memory to data, exchange and management; The data that send to LTE base station are forwarded; Mobility between VLC access point (AP) is managed; In the time that LTE and VLC switch, telegon encapsulates the signaling of LTE and data, is that signaling and data become the form that can transmit on VLC; Telegon is connected with MME by S1 interface, and telegon is connected with SGW by S1 interface, and telegon is connected with each LTE base station by X2 interface, and telegon communicates by 802.15.7 agreement and VLC access point.
2. a changing method for interconnected systems claimed in claim 1, comprises the switching of dual-mode terminal from LTE to VLC, it is characterized in that,
Switching from LTE to VLC comprises steps A 1 to A8:
1) steps A 1, when the current service network of dual-mode terminal is LTE, and detects the signal of VLC access point, and dual-mode terminal sends measurement report according to the measurement rules of LTE base station instruction to LTE base station; Measurement rules comprises the content of measuring the trigger condition, measuring period and the measurement report that report, and the content of measurement report comprises cell ID and cell signal quality;
2) steps A 2, handover decisions is analyzed and done in LTE base station by the measurement report of reporting of user; When meeting after the access point that is switched to VLC, handover request is sent to telegon by LTE base station, then proceeds to steps A 3, otherwise finish handoff procedure;
3) steps A 3, telegon receives after handover request, telegon is set up and is contacted by the VLC access point of reporting with measurement report, obtains available resources and the load information of VLC access point, and does to receive and control;
4) steps A 4, telegon is according to receiving control result that handover request ack message is returned to LTE base station, and LTE base station sends to dual-mode terminal according to handover request ack message by switching zero setting, and handover request ack message comprises allowing to switch or refusing to be switched;
5) steps A 5, the switching command obtaining when dual-mode terminal is that while allowing switching, dual-mode terminal will carry out the access procedure defining in VLC agreement with VLC access point; LTE carries out base station to switch and prepares and the buffer memory data to dual-mode terminal to be sent, is forwarded to telegon simultaneously;
6) steps A 6, when dual-mode terminal completes after the access procedure of VLC access point, sends to switch to telegon and confirms request, and telegon is made switching and confirmed response simultaneously;
7) steps A 7, in the time that telegon receives the handoff completion message of terminal, telegon reports handoff completion message to MME, and MME reports S-GW by handoff completion message and asks user's face to upgrade, and it is mainly that downlink path is switched in requirement that user's face upgrades; S-GW completes after the switching of lower path, thinks that MME sends user's face and upgrades feedback, and MME receives after the renewal of user's face is fed back and sends and switched response to virtual machine station;
8) steps A 8, telegon receives and has switched after response, sends resource release order to LTE base station, and LTE base station discharges the resource relevant to dual-mode terminal; Last telegon is transferred to dual-mode terminal by data cached by VLC access point, realizes the harmless transmission of data.
3. a changing method for interconnected systems claimed in claim 1, comprises the switching of dual-mode terminal from VLC to LTE, it is characterized in that, the switching from VLC to LTE comprises that step B1 is to B8;
1) step B1, when the current service network of dual-mode terminal is VLC, and the signal of LTE base station detected, dual-mode terminal sends measurement report according to the measurement rules of telegon instruction to telegon, measurement rules comprises measures the trigger condition that reports and the content of measurement report; The content of measurement report comprises little distinctive emblem, cell signal quality;
2) step B2, handover decisions is analyzed and done to telegon by the measurement report of reporting of user; When meeting after switching condition, handover request is sent to LTE base station by telegon, then proceeds to step B3, otherwise exponent number handoff procedure;
3) step B3, LTE receives base station after handover request, does to receive control according to the relevant information such as available resources and load of self;
4) step B4, LTE base station is according to receiving control result that handover request ack message is returned to telegon, and telegon sends to dual-mode terminal according to handover request ack message by hand off signaling;
5) step B5, the switching command obtaining when dual-mode terminal is while allowing switching, dual-mode terminal and the impromptu access procedure of synchronizeing in LTE base station, otherwise stop this handoff procedure; Telegon is carried out to switch and is prepared and the buffer memory data to dual-mode terminal to be sent, is forwarded to LTE base station simultaneously;
6) step B6, when dual-mode terminal completes after the access procedure of LTE base station, sends switch acknowledgment message to LTE base station;
7) step B7, in the time that LTE base station receives the handoff completion message of terminal, LTE base station reports handoff completion message to MME, and MME reports S-GW by handoff completion message and asks user's face to upgrade, and it is mainly that downlink path is switched in requirement that user's face upgrades; S-GW completes after downlink path switching, upgrades feedback to MME transmission user face, and MME receives and switched corresponding to the transmission of LTE base station after the renewal of user's face is fed back;
8) step B8, LTE base station receive switched corresponding after, send resource to telegon and release order, telegon discharges the VLC side resource relevant to dual-mode terminal; Last LTE base station is by the data cached dual-mode terminal that is transferred to.
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| CN105357764A (en) * | 2015-12-18 | 2016-02-24 | 北京邮电大学 | Resource allocation method and device for indoor visible light-femtocell heterogeneous network |
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| CN107181508A (en) * | 2016-03-09 | 2017-09-19 | 松下电器（美国）知识产权公司 | Communication terminal, communicator and communication system |
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| WO2016049837A1 (en) * | 2014-09-30 | 2016-04-07 | 华为技术有限公司 | Data transmission method and apparatus |
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| CN105357764A (en) * | 2015-12-18 | 2016-02-24 | 北京邮电大学 | Resource allocation method and device for indoor visible light-femtocell heterogeneous network |
| CN105357764B (en) * | 2015-12-18 | 2019-01-25 | 北京邮电大学 | Resource allocation methods and device in indoor visible light-Home eNodeB heterogeneous network |
| CN107181508A (en) * | 2016-03-09 | 2017-09-19 | 松下电器（美国）知识产权公司 | Communication terminal, communicator and communication system |
| CN109068361A (en) * | 2018-09-19 | 2018-12-21 | 北京邮电大学 | Resource allocation and handoff scheme in a kind of LED visible light cellular communications networks |
| CN112152712A (en) * | 2019-06-28 | 2020-12-29 | Oppo广东移动通信有限公司 | Communication system, communication method, and communication device |
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Application publication date: 20140723 |