WO2017016167A1 - 一种蜂窝网辅助的无线局域网信道切换通知方法 - Google Patents

一种蜂窝网辅助的无线局域网信道切换通知方法 Download PDF

Info

Publication number
WO2017016167A1
WO2017016167A1 PCT/CN2015/099268 CN2015099268W WO2017016167A1 WO 2017016167 A1 WO2017016167 A1 WO 2017016167A1 CN 2015099268 W CN2015099268 W CN 2015099268W WO 2017016167 A1 WO2017016167 A1 WO 2017016167A1
Authority
WO
WIPO (PCT)
Prior art keywords
channel switching
user equipment
channel
signaling
cellular network
Prior art date
Application number
PCT/CN2015/099268
Other languages
English (en)
French (fr)
Inventor
赵铖
朱元萍
杨旸
胡宏林
王海峰
钱骅
Original Assignee
上海无线通信研究中心
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 上海无线通信研究中心 filed Critical 上海无线通信研究中心
Priority to US15/100,315 priority Critical patent/US10225773B2/en
Priority to EP15862125.0A priority patent/EP3331275B1/en
Publication of WO2017016167A1 publication Critical patent/WO2017016167A1/zh

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/06—Reselecting a communication resource in the serving access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0077—Transmission or use of information for re-establishing the radio link of access information of target access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
    • H04W48/10—Access restriction or access information delivery, e.g. discovery data delivery using broadcasted information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
    • H04W48/12—Access restriction or access information delivery, e.g. discovery data delivery using downlink control channel
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/02—Selection of wireless resources by user or terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
    • 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]
    • 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

  • the present invention relates to a wireless local area network (WLAN) channel switching notification method, and more particularly to a cellular network assisted wireless local area network channel switching notification method, and belongs to the field of wireless communication technologies.
  • WLAN wireless local area network
  • WLAN APs wireless network access points
  • the AP may be deployed by different operators or by different users.
  • the existing WLAN equipment mainly works on two unlicensed frequency bands of 2.4 GHz and 5 GHz. Due to lack of sufficient communication and coordination, the basic service set (BSS) close to each other may select the same working channel, thereby causing mutual strength. Interference, or channel competition, is so busy that user equipment cannot be satisfactorily serviced. In response to this situation, some APs need to perform channel switching to avoid using the same channel as neighboring APs in order to better serve users.
  • the WLAN network needs to switch to other channels as soon as possible to avoid strong interference (or by different systems) on the radar system.
  • the AP needs to notify the user equipment associated with itself before performing channel switching, and the BSS will migrate to a new channel after a certain time.
  • Such channel switching notifications may be broadcast by the AP in a beacon or may be included in a Probe Response.
  • the user equipment Since most wireless portable devices use battery power, the user equipment will preferentially enter the Power Save mode from the perspective of reducing power consumption and extending battery life.
  • the user equipment in the power-saving mode will periodically wake up to receive the beacon frame sent by the AP according to the listening interval negotiated with the AP association phase, or wake up to send data when the user equipment has an uplink packet to send, or the user The device wakes up at any time to send a power-saving wheel training (PS-Poll) frame to the AP to ask if the AP has downlink buffer data to send to itself.
  • PS-Poll power-saving wheel training
  • the notification mode of the channel switching from the AP and the working mode of the user equipment in the energy-saving mode can be seen as a method for the AP specified in the current protocol to notify the user equipment to perform channel switching.
  • These unannounced user devices lose their association with the original AP after waking up, and need to re-scan and associate, which is not only time-consuming, but also detrimental to the energy saving of the user equipment.
  • the AP when the AP needs to switch to another channel (referred to as the second channel), the AP broadcasts a beacon frame carrying the channel switch announcement information, where the count field in the channel switch announcement is reflected.
  • the fast handover property is set to 2, and the count counter field is decremented by 1 each time a TBTT (target beacon frame transmission time) elapses.
  • the listening interval negotiated by the user equipment 1 and the user equipment 2 in the coverage of the AP is 2 beacon frames and 4 beacon frames, that is, the user equipment 1 wakes up every 2 beacon frames, and the user equipment 2 Wake up every 4 beacon frames.
  • the user equipment 1 has a short listening interval and is frequently monitored.
  • the beacon frame broadcasted by the AP can be received before the AP switches the channel, so that the channel switching plan of the AP is known, and the user equipment 2 wakes up after the AP has completed the channel switching, and misses.
  • the channel switching notification sent by the AP is not limited to the following parameters.
  • the data cached by the AP for the user equipment 2 may be discarded because the time threshold is reached;
  • User equipment 2 re-scans the channel and switches to other APs, and cannot receive the cached frames in the original AP.
  • User equipment for some dormant states may miss the channel switching notification of the AP, and there are some solutions in the industry.
  • the scheme of the neighboring AP auxiliary notification working on the same channel to inform the channel switching information to the dormant user equipment associated with the AP performing channel switching, so that these user equipments It can follow the original service AP in time to perform channel switching.
  • the AP 1 that performs the channel switching in the scheme after the decision is made to switch, informs the AP2 that the adjacent channel works by the access controller (Access Controller, abbreviated as AC), if the user equipment is sleeping.
  • AC Access Controller
  • the AP2 responds to the corresponding probe request frame, and notifies the corresponding user equipment of the channel switching information (which carries the AP1 MAC address and the new channel information) of the AP1.
  • the obvious limitation of this scheme is that AP1 and an adjacent AP2 need to work on the same channel, and the two can communicate through AC.
  • the adjacent co-channel APs are not necessarily deployed by the same carrier/individual. The information exchange between the two may not be possible between the two.
  • the beacon frame can be simultaneously transmitted on the old channel and the new channel, wherein the beacon carrying the AP new channel related information post-announcement is transmitted on the old channel.
  • the above solution requires the AP to send beacon frames simultaneously on multiple channels, which is infeasible.
  • the technical problem to be solved by the present invention is to provide a cellular network assisted wireless local area network channel switching notification method.
  • a cellular network assisted wireless local area network channel switching notification method includes the following steps:
  • the channel switching notification signaling is sent to the associated user equipment by using a broadcast mode, and the channel switching notification request signaling is sent to the cellular network base station that also serves the user equipment;
  • the cellular network base station After receiving the channel switching notification request signaling, the cellular network base station sends the channel switching notification signaling to the user equipment in the dormant state through the cellular link air interface;
  • the wireless network access point performs channel switching at a predetermined time, and the user equipment that directly learns the channel switching information by receiving the channel switching notification signaling and the user equipment that knows the channel switching information by using the cellular network base station follows the wireless network access. Point to perform channel switching.
  • the wireless network access point sends channel switching notification signaling in a periodically broadcast beacon frame.
  • the negotiation interval is negotiated, and the wireless network access point is negotiated before entering the sleep state, so that the wireless network accesses Point to estimate when the user device will wake up to listen to the beacon frame.
  • the wireless network access point determines, according to the associated user equipment status and the time when the handover is to be performed, the user equipment that may not receive the channel handover notification signaling, and according to the mapping of the pre-negotiated user equipment ID.
  • a rule is to map the user equipment ID that misses the channel switching notification signaling to the ID type that the cellular network base station can resolve.
  • the cellular network base station searches for the user equipment corresponding to the cellular network according to the pre-negotiated mapping manner. ID.
  • the cellular network base station receives the channel switching notification request signaling sent by the wireless network access point, if the terminal identifier included in the channel switching notification request signaling is a user identifiable by the cellular network If the device ID is used, the cellular network base station directly sends the channel switching notification signaling to the user equipment; otherwise, the cellular network base station first maps the terminal identifier in the channel switching notification request signaling to the identifiable user equipment ID in the cellular network. Channel switching notification signaling is then sent to the user equipment.
  • the cellular network base station sends channel switching notification signaling to the user equipment by using RRC control signaling.
  • the channel switching notification request signaling includes: the user equipment ID of the wireless network access point that is unable to receive the channel switching notification signaling, the ID of the wireless network access point, and the The channel switching mode of the wireless network access point, the channel before switching, the channel after switching, and the time of channel switching.
  • the channel switching notification signaling includes: an ID of the wireless network access point, a channel switching mode of the wireless network access point, a channel before switching, a channel after switching, and channel switching. time.
  • the WLAN channel switching notification method provided by the present invention is applicable to a heterogeneous network of a cellular network and a WLAN joint network, and can utilize a cellular network base station to assist in transmitting channel switching notification signaling of a WLAN AP, which is effective.
  • the channel switching information is notified to the user equipment that is in a dormant state due to power saving, so that it can quickly follow the AP for channel switching, thereby avoiding the process of rescanning and association.
  • FIG. 1 is a schematic diagram of a channel switching notification of a user equipment missing an AP due to dormancy
  • FIG. 2 is a diagram showing an example of a heterogeneous network of a cellular network and a WLAN joint network
  • FIG. 3 is a flow chart of channel transmission notification signaling transmission assisted by a cellular network base station in the present invention.
  • heterogeneous networks of cellular networks and WLAN joint networks have received extensive attention.
  • the information exchange and cooperation mechanism between the cellular network and the WLAN can utilize the respective characteristics of the two networks to provide better services for users and effectively improve the user experience.
  • the WLAN AP provides a WiFi access service in a smaller range
  • the cellular base station provides wide-area cellular macro coverage.
  • the cellular base station and the WLAN AP are connected through a control plane interface (XW interface).
  • XW interface control plane interface
  • a user equipment that is in the WLAN service area needs to have a multi-RAT capability, that is, the user equipment can maintain the connection between the WLAN and the cellular network at the same time.
  • the WLAN module of the user equipment is in a sleep state in the power saving mode, its cellular link module can still receive RRC control signaling from the cellular network.
  • the WLAN AP broadcasts channel switching notification signaling in the network before performing channel switching.
  • some user equipment may miss the channel switching notification signaling of the AP due to the sleep state in the power saving mode.
  • the present invention proposes a method for using the cellular network to assist the WLAN in channel switching notification signaling, so that the WLAN module is in the The user in the dormant state can receive the indication information that the AP will perform channel switching in time. Detailed description will be given below in conjunction with FIG. 3.
  • the AP and its associated user equipment periodically detect channel conditions. If a different system signal such as radar is detected on the current channel, or if the current channel is subjected to strong interference, or when the current channel competes too closely with the neighboring BSS to severely degrade the network performance, the AP may trigger channel switching and The measurement results of the AP and the user equipment select a relatively idle target channel.
  • the AP transmits channel switch announcement signaling in the periodically broadcast beacon frame.
  • the channel switching notification signaling includes a "new channel number” and a "channel switching count” field, and the specific format is as shown in Table 1:
  • Element ID indicates the identity of the element
  • Length indicates the length of the frame.
  • Channel switch mode Channel switching mode. If this bit is set to 1, the connected user equipment will stop transmitting frames until the channel switch is completed. If set to 0, the transmission of frames is not limited.
  • New channel number new channel number
  • Channel switch count Channel switch count. Here, it is described how many Beacon frame intervals are followed by channel switching.
  • the AP determines, according to the associated user equipment status and the time when the handover is to be performed, the user equipment that may not receive the channel switching notification signaling sent by the AP, and according to the mapping rule of the pre-negotiated user equipment ID, The ID of the user equipment that misses the channel switching notification signaling is mapped to the ID type that the cellular network base station can resolve.
  • the listening interval is negotiated, and the user equipment negotiates with the AP before entering the sleep state. Therefore, the AP can estimate when the user equipment wakes up to listen to the beacon. frame. After the AP determines the time for channel switching, if the user equipment associated with it is in the dormant state, the AP can clarify which user equipments miss the channel switching notification message carrying the channel switch announcement because they do not wake up to listen to the beacon frame. make.
  • the mapping of the user equipment ID may be performed at the cellular network base station, that is, after the AP sends the identifiable user equipment ID in the WLAN network to the cellular network base station, the cellular network base station performs pre-negotiation.
  • the mapping mode looks up the ID of the user equipment corresponding to the cellular network.
  • the AP After the AP decides to perform channel switching, the AP sends a channel switching notification request signaling to the same service through an interface between the WLAN AP and the cellular network, such as a control plane interface (XW interface).
  • XW interface control plane interface
  • the channel switching notification request signaling includes the following: the AP estimates the user equipment ID of the channel switching notification signaling, the ID of the AP (MAC address or BSSID, SSID, HESSID, etc.), the channel switching mode of the AP, and the pre-switching Channel, time after switching, time of channel switching, etc.
  • Table 2 gives an example of channel switching notification request signaling.
  • Table 2 Channel switching notification request signaling sent by the AP to the cellular base station
  • the cellular network base station After receiving the channel switching notification request signaling sent by the AP, if the terminal identifier included in the signaling is a user equipment ID identifiable by the cellular network (for example, a C-RNTI of the terminal), the cellular network base station directly Channel switching notification signaling is sent to the user equipments through RRC control signaling; otherwise, the cellular network base station needs to first map the terminal identifier in the channel switching notification request signaling to the identifiable user equipment ID in the cellular network, and then The user equipment sends channel switching notification signaling.
  • the terminal identifier included in the signaling is a user equipment ID identifiable by the cellular network (for example, a C-RNTI of the terminal)
  • the cellular network base station directly Channel switching notification signaling is sent to the user equipments through RRC control signaling; otherwise, the cellular network base station needs to first map the terminal identifier in the channel switching notification request signaling to the identifiable user equipment ID in the cellular network, and then The user equipment sends channel switching notification signaling.
  • the above channel switching notification signaling needs to include at least the following: ID information of the AP (MAC address or BSSID, SSID, HESSID, etc.), channel switching mode of the AP, channel before handover, channel after handover, time of channel switching, etc. .
  • ID information of the AP MAC address or BSSID, SSID, HESSID, etc.
  • Table 3 gives an example of channel switching notification signaling.
  • the cellular network base station After receiving the channel switching notification request signaling, the cellular network base station uses the RRC control signaling and forwards the packet to the specific dormant user equipment through the cellular link air interface, ensuring that the user equipment can quickly follow the AP for channel switching, and reduce the energy consumption of the user equipment. .
  • the user equipment in the dormant state After receiving the channel switching notification signaling through the cellular link, the user equipment in the dormant state will follow in time after the associated AP performs channel switching, thereby avoiding the rescanning and association process of time-consuming power consumption.
  • the AP performs channel switching at a predetermined time.
  • the user equipment that directly learns the channel switching information by receiving the channel switching notification and the user equipment that knows the channel switching information through the cellular network base station can follow the AP for channel switching, and perform communication on the switched channel.
  • the present invention utilizes a cell network base station to assist in transmitting channel switching notification signaling of a WLAN AP, and effectively notifies the channel switching information to the user equipment that is in a dormant state due to power saving, so that the channel can be quickly followed by the AP. Switching avoids the process of rescanning and associating.

Landscapes

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

Abstract

本发明公开了一种蜂窝网辅助的无线局域网信道切换通知方法，包括如下步骤：在无线网络接入点进行信道切换之前，通过广播方式向所关联的用户设备下发信道切换通知信令，并向同样服务用户设备的蜂窝网基站发送信道切换通知请求信令；蜂窝网基站收到信道切换通知请求信令之后，通过蜂窝链路空口向处于休眠状态的用户设备发送信道切换通知信令；无线网络接入点在预定时间进行信道切换，通过接收信道切换通知信令直接获知信道切换信息的用户设备和通过蜂窝网基站获知信道切换信息的用户设备跟随无线网络接入点进行信道切换。

Description

一种蜂窝网辅助的无线局域网信道切换通知方法 技术领域
本发明涉及一种无线局域网(WLAN)信道切换通知方法，尤其涉及一种蜂窝网辅助的无线局域网信道切换通知方法，属于无线通信技术领域。
背景技术
在人口密集区域(例如机场、车站、体育场和校园宿舍等)，常常需要通过密集部署WLAN AP(无线网络接入点)来满足爆炸式增长的网络接入和服务需求。部署AP的可能是不同的运营商，也可能是不同的用户。现有的WLAN设备主要工作在2.4GHz和5GHz两个非授权频段上，由于缺乏足够的沟通协调，彼此靠近的基础服务集合(BSS)可能会选择同样的工作信道，从而造成相互之间的强干扰，或信道竞争繁忙程度高，致使用户设备无法得到满意的服务。针对这种情况，一些AP需要进行信道切换，避开与临近AP使用同样的信道，以便更好地为用户提供服务。此外，根据电信监管部门的要求，当在工作信道上检测到有雷达等异系统信号时，WLAN网络需要尽快切换到其他信道以避免对雷达等异系统造成(或受到异系统)的强干扰。
根据IEEE 802.11系列标准，AP在决定进行信道切换后，需要在执行信道切换前通知与自己关联的用户设备在一定时间之后，BSS将迁移到一个新的信道工作。这种信道切换通知可由AP在信标帧(beacon)中广播，也可包含在探测响应(Probe Response)中。
由于无线便携设备大多使用电池供电，从降低功耗、延长电池的使用寿命的角度出发，用户设备会优先进入节能模式(Power Save mode)。处于节能模式的用户设备只会根据与AP关联阶段协商的监听间隔(listen interval)周期性地醒来接收AP发送的beacon帧，或者当用户设备有上行包要发送时醒来发送数据，或者用户设备随时醒来给AP发送省电轮训(PS-Poll)帧询问AP是否有下行缓存数据要发送给自己。
从AP进行信道切换的通知方式，以及节能模式的用户设备工作方式可以看出，在当前协议中规定的AP通知用户设备进行信道切换的方法， 存在以下出错的可能：由于快速信道切换的需求，处于节能模式的用户设备还未收到AP的信道切换通知，AP就需要进行信道切换。这些未被通知到的用户设备在醒来之后会失去与原AP的关联，需要重新进行扫描和关联，不仅耗时，也不利于用户设备的节能。
如图1所示，当AP需要切换到另一信道(简称为第二信道)上去时，AP会广播下发携带有channel switch announcement信息的beacon帧，其中channel switch announcement中的count计数字段为体现出快速切换性质被设置为2，每经过一个TBTT(目标信标帧传输时间)，count计数字段减1，当count＝0时，AP立即执行信道切换，从第一信道切换到第二信道上。AP覆盖范围下的用户设备1和用户设备2在与AP关联时协商的监听间隔分别为2个beacon帧和4个beacon帧，即用户设备1每隔2个beacon帧醒来一次，用户设备2每隔4个beacon帧醒来一次。用户设备1监听间隔较短，监听较为频繁，能在AP切换信道前接收到AP广播的beacon帧，从而知道AP的信道切换计划，而用户设备2在AP已经完成信道切换之后才醒来，错过了AP发出的信道切换通知。
这样会导致以下几个问题：
1.用户设备2醒来后需要重新进行信道扫描、执行重关联等操作，耗时较长且增加了用户设备2的功耗；
2.AP替用户设备2缓存的数据可能因为达到时间阈值而被丢弃；
3.用户设备2重新扫描信道会切换到其他AP，无法收到原AP中的缓存帧。
由此可见，如果用户设备没有收到AP的信道切换通知，将会导致用户体验变差。因此，需要针对此类问题设计相应的解决方案。
针对一些休眠状态的用户设备可能会错失AP的信道切换通知的问题，业内已经有一些解决方案。例如公布号为CN103686881A的中国专利申请中，提出了利用工作在相同信道上的相邻AP辅助通知的方案，将信道切换信息告知给与进行信道切换的AP关联的休眠用户设备，以便这些用户设备能及时跟随原服务AP进行信道切换。该方案中要进行信道切换的AP 1在决定进行切换后，将信道切换的相关信息通过接入控制器(Access Controller，简写为AC)告知相邻同信道工作的AP2，若有用户设备由于休眠错过了AP1的信道切换通知，会在醒来后在原信道上发 送探测请求，AP2收到相应的探测请求帧后作出响应，将AP1的信道切换信息(携带有AP1MAC地址、新信道信息)通知对应的用户设备。但是，该方案存在的明显局限性在于需要AP1和某临近的AP2工作在相同信道，且两者之间可以通过AC通信。而在实际场景中，相邻的共信道AP并非一定是同一运营商/个人部署的，两者之间可能无法通过AC进行信息交互。
另外，在公布号为WO2014013424A2的PCT申请中，提出当AP完成信道切换后，可在旧信道和新信道上同时发送beacon帧，其中旧信道上发送携带有AP新信道相关信息post-announcement的beacon帧，以此来指示休眠的用户设备完成信道切换；或者当AP在新信道处于contention-free period期间，AP跳回到旧信道发送携带有AP新信道信息post-announcement的beacon帧，以此来指示休眠的用户设备完成信道切换。上述方案要求AP在多信道同时发beacon帧，可行性差。
发明内容
本发明所要解决的技术问题在于提供一种蜂窝网辅助的无线局域网信道切换通知方法。
为实现上述的发明目的，本发明采用下述的技术方案：
一种蜂窝网辅助的无线局域网信道切换通知方法，包括如下步骤：
在无线网络接入点进行信道切换之前，通过广播方式向所关联的用户设备下发信道切换通知信令，并向同样服务所述用户设备的蜂窝网基站发送信道切换通知请求信令；
所述蜂窝网基站收到所述信道切换通知请求信令之后，通过蜂窝链路空口向处于休眠状态的用户设备发送信道切换通知信令；
所述无线网络接入点在预定时间进行信道切换，通过接收信道切换通知信令直接获知信道切换信息的用户设备和通过所述蜂窝网基站获知信道切换信息的用户设备跟随所述无线网络接入点进行信道切换。
其中较优地，所述无线网络接入点在周期性广播的beacon帧中发送信道切换通知信令。
其中较优地，所述用户设备在与所述无线网络接入点关联时，进行监听间隔的协商，在进入休眠状态之前和所述无线网络接入点进行协商，以便所述无线网络接入点预估所述用户设备会在何时醒来侦听beacon 帧。
其中较优地，所述无线网络接入点根据所关联的用户设备状态以及将要进行切换的时间，确定可能无法收到信道切换通知信令的用户设备，并根据预先协商的用户设备ID的映射规则，将错过信道切换通知信令的用户设备ID映射为所述蜂窝网基站能够解析的ID类型。
其中较优地，所述无线网络接入点将无线局域网中可识别的用户设备ID发给蜂窝网基站后，由所述蜂窝网基站根据预先协商的映射方式查找该用户设备对应在蜂窝网中的ID。
其中较优地，所述蜂窝网基站收到所述无线网络接入点发来的信道切换通知请求信令后，若该信道切换通知请求信令中包含的终端标识为蜂窝网可识别的用户设备ID，则该蜂窝网基站直接向所述用户设备发送信道切换通知信令；否则，蜂窝网基站先将信道切换通知请求信令中的终端标识映射为蜂窝网中可识别的用户设备ID，然后向所述用户设备发送信道切换通知信令。
其中较优地，所述蜂窝网基站通过RRC控制信令向所述用户设备发送信道切换通知信令。
其中较优地，所述信道切换通知请求信令包含如下内容：所述无线网络接入点预估无法收到信道切换通知信令的用户设备ID、所述无线网络接入点的ID、所述无线网络接入点的信道切换模式、切换前的信道、切换后的信道、信道切换的时间。
其中较优地，所述信道切换通知信令包含以下内容：所述无线网络接入点的ID、所述无线网络接入点的信道切换模式、切换前的信道、切换后的信道、信道切换的时间。
与现有技术相比较，本发明所提供的无线局域网信道切换通知方法适用于蜂窝网和WLAN联合组网的异构网络中，可以利用蜂窝网基站辅助发送WLAN AP的信道切换通知信令，有效地将信道切换的信息告知给因节能而处于休眠状态的用户设备，使之可以快速跟随AP进行信道切换，避免了重新扫描和关联的过程。
附图说明
图1为用户设备由于休眠错过AP的信道切换通知的示意图
图2为蜂窝网和WLAN联合组网的异构网络示例图；
图3为本发明中，由蜂窝网基站辅助进行信道切换通知信令发送的流程图。
具体实施方式
下面结合附图和具体实施例对本发明的技术内容展开详细具体的说明。
近年来，蜂窝网和WLAN联合组网的异构网络得到了广泛关注。在该异构网络架构下，可以通过蜂窝网和WLAN之间的信息交互和协作机制，利用两个网络各自的特点为用户提供更好的服务，有效提升用户体验。
如图2所示，在蜂窝网和WLAN组成的异构网络下，WLAN AP提供较小范围内的WiFi的接入服务，蜂窝网基站提供广域蜂窝宏覆盖。蜂窝网基站和WLAN AP之间通过控制平面接口(XW接口)进行连接。处于WLAN服务范围内的用户设备需要具有多网络接入(Multi-RAT)能力，即用户设备能够同时维持WLAN和蜂窝网的连接。当用户设备的WLAN模块处于节能模式下的休眠状态时，其蜂窝链路模块仍然能接收到来自蜂窝网的RRC控制信令。
WLAN AP在进行信道切换之前，会在网络中广播信道切换通知信令。但是，部分用户设备由于正处于节能模式下的休眠状态，可能会错过AP的信道切换通知信令。为了避免这些休眠的用户设备醒来后由于错过信道切换通知信令而与原AP失去关联，本发明提出了一种利用蜂窝网来辅助WLAN进行信道切换通知信令的方法，以供WLAN模块处于休眠状态下的用户能及时收到AP将要进行信道切换的指示信息。下面结合图3展开详细具体的说明。
在本发明中，AP和与其关联的用户设备会周期性地对信道状况进行检测。若在当前信道上检测到雷达等异系统信号，或者在当前信道受到较强干扰，或者在当前信道与临近的BSS竞争太过激烈而严重降低了网络性能时，AP可以触发信道切换，并根据AP和用户设备的测量结果选择一个相对空闲的目标信道。
接下来，AP在周期性广播的beacon帧中发送信道切换通知(channel switch announcement)信令。信道切换通知信令中包含着“新信道编号”和“信道切换计数”字段，具体格式如表1所示：
Figure PCTCN2015099268-appb-000001
表1 AP通过beacon广播的信道切换通知信令
表1中的各个字段解释如下：
Element ID：表示元素的标识
Length：表示帧的长度
Channel switch mode：信道切换模式。如果此位设定为1，已连接的用户设备就会停止发送帧，直到信道切换完成。如果设定为0，则帧的发送就不受限制。
New channel number：新信道编号
Channel switch count：信道切换计数。此处记载再过多少Beacon帧间隔后进行信道切换。
如图3所示，在AP通过周期性广播的beacon帧中发送信道切换通知信令的过程中，有部分用户设备(例如图3中的UE1)由于处于节能模式下的休眠状态而无法收到信道切换通知信令。为此，AP根据所关联的用户设备状态，以及将要进行切换的时间，确定可能无法收到其发送的信道切换通知信令的用户设备，并根据预先协商的用户设备ID的映射规则，将会错过信道切换通知信令的用户设备的ID映射为蜂窝网基站能够解析的ID类型。
需要说明的是，用户设备在与AP关联时会进行监听间隔的协商，且用户设备在进入休眠状态之前也会和AP进行协商，故AP可以预估用户设备会在何时醒来侦听beacon帧。AP决定要进行信道切换的时间后，若有与之关联的用户设备处于休眠状态，AP可以明确哪些用户设备会因为没有及时醒来侦听beacon帧而错过携带有channel switch announcement的信道切换通知信令。
在本发明的另一实施例中，用户设备ID的映射可在蜂窝网基站处进行，即：AP将WLAN网络中可识别的用户设备ID发给蜂窝网基站后，由蜂窝网基站根据预先协商的映射方式查找该用户设备对应在蜂窝网中的ID。
AP在决定进行信道切换后，通过WLAN AP和蜂窝网之间的接口，例如控制平面接口(XW接口)，发送信道切换通知请求信令给同样服务这些 用户设备的蜂窝网基站。该信道切换通知请求信令包含如下内容：AP预估无法收到信道切换通知信令的用户设备ID、AP的ID(MAC地址或BSSID、SSID、HESSID等)、AP的信道切换模式、切换前的信道、切换后的信道、信道切换的时间等。
表2给出了信道切换通知请求信令的一个示例。
Figure PCTCN2015099268-appb-000002
表2 AP发至蜂窝网基站的信道切换通知请求信令
蜂窝网基站收到AP发来的信道切换通知请求信令后，若该信令中包含的终端标识为蜂窝网可识别的用户设备ID(例如终端的C-RNTI)，则该蜂窝网基站直接通过RRC控制信令向这些用户设备发送信道切换通知信令；否则，蜂窝网基站需要先将信道切换通知请求信令中的终端标识映射为蜂窝网中可识别的用户设备ID，然后再向这些用户设备发送信道切换通知信令。
上述的信道切换通知信令至少需要包含以下内容：AP的ID信息(MAC地址或BSSID、SSID、HESSID等)、AP的信道切换模式、切换前的信道、切换后的信道、信道切换的时间等。表3给出了信道切换通知信令的一个示例。
Figure PCTCN2015099268-appb-000003
表3 蜂窝网基站发给用户设备的信道切换通知信令
蜂窝网基站收到信道切换通知请求信令之后，利用RRC控制信令并通过蜂窝链路空口转发给特定的休眠用户设备，保证用户设备能快速跟随AP进行信道切换，降低用户设备的能耗开销。在通过蜂窝链路收到信道切换通知信令后，处于休眠状态的用户设备将在关联的AP进行信道切换后及时跟随，避免了耗时耗电的重新扫描和关联过程。
AP在预定时间进行信道切换，通过接收信道切换通知直接获知信道切换信息的用户设备和通过蜂窝网基站获知信道切换信息的用户设备可以跟随AP进行信道切换，并在切换后的信道进行通信。
与现有技术相比较，本发明利用蜂窝网基站辅助发送WLAN AP的信道切换通知信令，有效地将信道切换信息告知给因节能而处于休眠状态的用户设备，使之可以快速跟随AP进行信道切换，避免了重新扫描和关联的过程。
上面对本发明所提供的蜂窝网辅助的无线局域网信道切换通知方法进行了详细的说明，但显然本发明的具体实现形式并不局限于此。对于本领域的一般技术人员来说，在不背离本发明的精神和权利要求范围的情况下对它进行的各种显而易见的改变都在本发明的保护范围之内。

Claims (9)

  1. 一种蜂窝网辅助的无线局域网信道切换通知方法，其特征在于包括如下步骤：
    在无线网络接入点进行信道切换之前，通过广播方式向所关联的用户设备下发信道切换通知信令，并向同样服务所述用户设备的蜂窝网基站发送信道切换通知请求信令；
    所述蜂窝网基站收到所述信道切换通知请求信令之后，通过蜂窝链路空口向处于休眠状态的用户设备发送信道切换通知信令；
    所述无线网络接入点在预定时间进行信道切换，通过接收信道切换通知信令直接获知信道切换信息的用户设备和通过所述蜂窝网基站获知信道切换信息的用户设备跟随所述无线网络接入点进行信道切换。
  2. 如权利要求1所述的无线局域网信道切换通知方法，其特征在于：
    所述无线网络接入点在周期性广播的beacon帧中发送信道切换通知信令。
  3. 如权利要求1或2所述的无线局域网信道切换通知方法，其特征在于：
    所述用户设备在与所述无线网络接入点关联时，进行监听间隔的协商，在进入休眠状态之前和所述无线网络接入点进行协商，以便所述无线网络接入点预估所述用户设备会在何时醒来侦听beacon帧。
  4. 如权利要求1所述的无线局域网信道切换通知方法，其特征在于：
    所述无线网络接入点根据所关联的用户设备状态以及将要进行切换的时间，确定可能无法收到信道切换通知信令的用户设备，并根据预先协商的用户设备ID的映射规则，将错过信道切换通知信令的用户设备ID映射为所述蜂窝网基站能够解析的ID类型。
  5. 如权利要求1所述的无线局域网信道切换通知方法，其特征在于：
    所述无线网络接入点将无线局域网中可识别的用户设备ID发给蜂窝网基站后，由所述蜂窝网基站根据预先协商的映射方式查找该用户设 备对应在蜂窝网中的ID。
  6. 如权利要求1所述的无线局域网信道切换通知方法，其特征在于：
    所述蜂窝网基站收到所述无线网络接入点发来的信道切换通知请求信令后，若该信道切换通知请求信令中包含的终端标识为蜂窝网可识别的用户设备ID，则该蜂窝网基站直接向所述用户设备发送信道切换通知信令；否则，蜂窝网基站先将信道切换通知请求信令中的终端标识映射为蜂窝网中可识别的用户设备ID，然后向所述用户设备发送信道切换通知信令。
  7. 如权利要求1或6所述的无线局域网信道切换通知方法，其特征在于：
    所述蜂窝网基站通过RRC控制信令向所述用户设备发送信道切换通知信令。
  8. 如权利要求1所述的无线局域网信道切换通知方法，其特征在于：
    所述信道切换通知请求信令包含如下内容：所述无线网络接入点预估无法收到信道切换通知信令的用户设备ID、所述无线网络接入点的ID、所述无线网络接入点的信道切换模式、切换前的信道、切换后的信道、信道切换的时间。
  9. 如权利要求1所述的无线局域网信道切换通知方法，其特征在于：
    所述信道切换通知信令包含以下内容：所述无线网络接入点的ID、所述无线网络接入点的信道切换模式、切换前的信道、切换后的信道、信道切换的时间。
PCT/CN2015/099268 2015-07-28 2015-12-28 一种蜂窝网辅助的无线局域网信道切换通知方法 WO2017016167A1 (zh)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US15/100,315 US10225773B2 (en) 2015-07-28 2015-12-28 Cellular-network-assisted wireless local area network channel switch announcement method
EP15862125.0A EP3331275B1 (en) 2015-07-28 2015-12-28 Method for wireless local area network channel handover notification assisted by cellular network

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201510454069.6A CN106385697B (zh) 2015-07-28 2015-07-28 一种蜂窝网辅助的无线局域网信道切换通知方法
CN2015104540696 2015-07-28

Publications (1)

Publication Number Publication Date
WO2017016167A1 true WO2017016167A1 (zh) 2017-02-02

Family

ID=57884047

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2015/099268 WO2017016167A1 (zh) 2015-07-28 2015-12-28 一种蜂窝网辅助的无线局域网信道切换通知方法

Country Status (4)

Country Link
US (1) US10225773B2 (zh)
EP (1) EP3331275B1 (zh)
CN (1) CN106385697B (zh)
WO (1) WO2017016167A1 (zh)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019060015A1 (en) * 2017-09-21 2019-03-28 Sony Mobile Communications Inc. METHOD AND APPARATUS FOR ANCHOR CHANNEL CONTROL
CN112737718A (zh) * 2020-12-29 2021-04-30 Oppo广东移动通信有限公司 信道切换方法、装置、电子设备及存储介质

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108882320B (zh) * 2018-06-12 2021-03-02 Oppo广东移动通信有限公司 无线通信传输方法、装置、移动终端及计算机可读取存储介质
KR20200012391A (ko) 2018-07-27 2020-02-05 삼성전자주식회사 통신 시스템에서 비면허대역을 사용하는 방법 및 장치
CN109495970A (zh) * 2018-12-21 2019-03-19 Tcl移动通信科技（宁波）有限公司 移动终端wifi频道切换方法、移动终端及存储介质
CN111988101B (zh) * 2019-05-23 2022-08-05 杭州海康威视数字技术股份有限公司 一种无线信道切换方法、系统、接入点及工作站
US10873848B1 (en) * 2019-06-07 2020-12-22 Cisco Technology, Inc. Systems and methods providing a station with a suggestion to transition from Wi-Fi to LTE
CN111163497B (zh) * 2019-12-19 2022-08-16 展讯通信（上海）有限公司 通信设备、系统及信道切换方法
US11412511B2 (en) 2020-05-05 2022-08-09 Facebook Technologies, Llc Switching between different communication protocols
US11451552B2 (en) * 2020-06-04 2022-09-20 Hewlett Packard Enterprise Development Lp Basic service set (BSS) color-based containment and mitigation
CN113965982B (zh) * 2021-09-09 2024-02-13 南方电网数字平台科技(广东)有限公司 一种wapi无线接入点、无线系统及其控制方法

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014013424A2 (en) 2012-07-16 2014-01-23 Renesas Mobile Corporation Method and apparatus for facilitating channel switching
CN103686881A (zh) 2012-09-11 2014-03-26 华为技术有限公司 信道切换方法、设备及系统
CN103686890A (zh) * 2012-09-07 2014-03-26 中兴通讯股份有限公司 无线局域网中实现无线终端漫游切换的方法及系统
CN103702375A (zh) * 2013-12-25 2014-04-02 北京邮电大学 一种wtru利用蜂窝网在无线局域网中切换的方法及系统
WO2014056163A1 (en) * 2012-10-10 2014-04-17 Broadcom Corporation Method and apparatus for managing handovers
CN104038971A (zh) * 2013-03-06 2014-09-10 电信科学技术研究院 一种链路切换方法及装置

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7508781B2 (en) * 2003-03-25 2009-03-24 Texas Instruments Incorporated Power saving mechanism for wireless LANs via schedule information vector
JP2006093945A (ja) * 2004-09-22 2006-04-06 Nec Corp 無線ｌａｎハンドオーバー方法、及び無線ｌａｎ装置
US8379558B2 (en) * 2005-09-16 2013-02-19 Apple Inc. Sending an identifier of a wireless local area network to enable handoff of a mobile station to the wireless local area network
US8880104B2 (en) * 2006-03-03 2014-11-04 Qualcomm Incorporated Standby time improvements for stations in a wireless network
US8862169B2 (en) * 2010-12-21 2014-10-14 Qualcomm Incorporated Beacon transmission for a set of femtocells
CN103108364B (zh) * 2011-11-14 2017-03-22 中国移动通信集团公司 通信参数确定方法、在wlan中进行通信的方法及装置
CN103327579B (zh) * 2012-03-19 2019-07-09 中兴通讯股份有限公司 休眠方法及装置
WO2013154403A1 (ko) * 2012-04-13 2013-10-17 엘지전자 주식회사 무선 통신 시스템에서 채널 액세스 방법 및 이를 위한 장치
US9544811B2 (en) * 2012-11-19 2017-01-10 Qualcomm Incorporated Systems and methods for beacon timing adjustment in wireless networks
WO2014142459A1 (ko) * 2013-03-10 2014-09-18 엘지전자 주식회사 복수의 통신 시스템 융합 망에서 채널 스위치를 수행하는 방법 및 이를 위한 장치
US9445345B2 (en) * 2013-09-17 2016-09-13 Qualcomm Incorporated Staggered primary channel selection in wifi communication systems
US20150195849A1 (en) * 2014-01-06 2015-07-09 Intel IP Corporation Systems, methods and devices for multiple signal co-existence in multiple-use frequency spectrum

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014013424A2 (en) 2012-07-16 2014-01-23 Renesas Mobile Corporation Method and apparatus for facilitating channel switching
CN103686890A (zh) * 2012-09-07 2014-03-26 中兴通讯股份有限公司 无线局域网中实现无线终端漫游切换的方法及系统
CN103686881A (zh) 2012-09-11 2014-03-26 华为技术有限公司 信道切换方法、设备及系统
WO2014056163A1 (en) * 2012-10-10 2014-04-17 Broadcom Corporation Method and apparatus for managing handovers
CN104038971A (zh) * 2013-03-06 2014-09-10 电信科学技术研究院 一种链路切换方法及装置
CN103702375A (zh) * 2013-12-25 2014-04-02 北京邮电大学 一种wtru利用蜂窝网在无线局域网中切换的方法及系统

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP3331275A4

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019060015A1 (en) * 2017-09-21 2019-03-28 Sony Mobile Communications Inc. METHOD AND APPARATUS FOR ANCHOR CHANNEL CONTROL
US11419081B2 (en) 2017-09-21 2022-08-16 Sony Group Corporation Method and apparatus for anchor channel control
CN112737718A (zh) * 2020-12-29 2021-04-30 Oppo广东移动通信有限公司 信道切换方法、装置、电子设备及存储介质
CN112737718B (zh) * 2020-12-29 2023-01-10 Oppo广东移动通信有限公司 信道切换方法、装置、电子设备及存储介质

Also Published As

Publication number Publication date
US10225773B2 (en) 2019-03-05
US20180132149A1 (en) 2018-05-10
CN106385697A (zh) 2017-02-08
EP3331275A4 (en) 2019-01-16
CN106385697B (zh) 2019-09-20
EP3331275B1 (en) 2020-04-15
EP3331275A1 (en) 2018-06-06

Similar Documents

Publication Publication Date Title
WO2017016167A1 (zh) 一种蜂窝网辅助的无线局域网信道切换通知方法
US11228952B2 (en) Method and apparatus for low-power operations of terminal and base station in mobile communication system
EP3512263B1 (en) Method and apparatus for controlling communication of a portable terminal in a wireless communication system
JP6401272B2 (ja) マルチ―ｒａｔ環境で端末の要請に応じてネットワークノードの状態を切り替える方法及びこのための装置
US9560586B2 (en) Communication method in wireless local area network system
KR102620316B1 (ko) 웨이크-업 라디오를 이용하는 무선 통신 방법 및 무선 통신 단말
KR101500894B1 (ko) 무선 접속 시스템에서 액세스 포인트를 검출하기 위한 방법 및 장치
KR101819514B1 (ko) 무선 통신 시스템에서 idc 간섭 제거를 위한 측정 방법 및 이를 위한 장치
US9210660B2 (en) Method and device for transceiving data in a radio access system supporting multi-radio access technology
US20160286483A1 (en) Procedures for Controlling Alternative Radio-Access Technology (RAT) in Multi-RAT Capable Terminals
WO2014044132A1 (zh) 一种小小区的发现方法和装置
US9049671B2 (en) Radio communication system, radio base station, and power control method
JP2016502326A (ja) 無線通信システムで基地局の動作状態の制御方法及び装置
US20140106793A1 (en) Method and apparatus for efficiently performing paging in a wireless access system that supports a multi-radio access technology
CN103493401A (zh) 用于在支持多无线电接入技术的无线电接入系统中收发数据的方法和装置
US20170347389A1 (en) Method and device for configuring improved drx scheme for connected terminals in wireless communication system
US10136387B2 (en) Method and apparatus for configuring event-triggered DRX in wireless communication system
TW202021395A (zh) 功率設定檔自適應方法及使用者設備
WO2014094591A1 (zh) 小区休眠、休眠信息下发及处理方法和设备
US20240172120A1 (en) Communication method and related apparatus
CN105103597B (zh) 无线通信小区检测技术
EP2747490A1 (en) Session termination in an energy-efficient cellular wireless telecommunications system
WO2014140408A1 (en) Power saving for a mobile station during connection setup
KR102192272B1 (ko) 면허 대역을 통한 무선랜 초기 접속 방법 및 이러한 방법을 수행하는 장치
WO2015188322A1 (zh) 一种移动性管理方法、相关设备及移动性管理系统

Legal Events

Date Code Title Description
REEP Request for entry into the european phase

Ref document number: 2015862125

Country of ref document: EP

WWE Wipo information: entry into national phase

Ref document number: 15100315

Country of ref document: US

121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 15862125

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

WWE Wipo information: entry into national phase

Ref document number: 2015862125

Country of ref document: EP