CN107770867A

CN107770867A - Cooperation control method and device between WAP

Info

Publication number: CN107770867A
Application number: CN201610693992.XA
Authority: CN
Inventors: 刁心玺
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2016-08-19
Filing date: 2016-08-19
Publication date: 2018-03-06
Also published as: WO2018033071A1

Abstract

The present invention discloses cooperation control method and device between a kind of WAP；Method includes：Second WAP uses the running time-frequency resource with the first WAP equity, time-frequency equity replaces step of transmitting and sends schedule information to terminal between macro-diversity step of transmitting or WAP between WAP, equity replacement/transparent replacement (the replacement unaware of control channel that terminal-pair occur) of the control channel between the first WAP and the second WAP is realized, realizes terminal fast transparent migration or transparent movement between neighbor radio access points.

Description

Method and device for controlling cooperation between wireless access points

Technical Field

The present invention relates to a cooperation control technology in the field of communication technologies, and in particular, to a method and an apparatus for cooperation control between wireless access points.

Background

In order to support high-speed movement of the terminal and realize flexible cooperation between the wireless access points, the position of the terminal and the channel state of the terminal need to be acquired quickly in real time, so that quick transparent migration or transparent movement of a terminal communication link between adjacent wireless access points is realized.

The realization of fast migration of a terminal communication link between cells through cooperative transmission between cells is a requirement of subsequent Evolution of a Long Term Evolution (LTE) system. The proposed Coordinated multi-point transmission (CoMP) in the LTE system is to improve the transmission rate of the cell edge terminal, and specifically, to improve the signal strength received by the terminal in the edge area. CoMP is realized on the premise of inter-cell interference coordination, and needs to be a transmission diversity and Multiple-Input Multiple-Output (MIMO) transmission scheme realized when inter-multipoint interference is avoided.

Coordinated scheduling and beamforming (CS/CB) is an inter-beam coordination technique that can dynamically reduce interference from other cells. The data of the UE is obtained from the serving node, and the scheduling and beamforming of the user is based on the coordination result between evolved base stations (enodebs) in the CoMP cluster.

The core technology of downlink CoMP is Joint Processing and Transmission (JPT), and the JPT includes at least two implementation manners, which are: a) dynamic node selection, namely dynamically selecting one eNodeB from a cluster of eNodeBs participating in cooperative transmission according to Channel State Indicator (CSI) information, and sending data to the UE; b) joint sending, according to the CSI information, dynamically selecting two or more eNodeBs from a cluster of eNodeBs participating in cooperative transmission, and simultaneously sending data to the UE; the above scheme that multiple enodebs are simultaneously used for transmitting data to a UE is divided into two cases: incoherent and coherent emissions; a typical way of non-coherent transmission is transmit diversity; a typical way of coherent transmission is MIMO transmission.

From the view of the link control mode of CoMP, one is a respective control mode of each cell/node adopted by the existing CoMP transmission in the LTE system, and is characterized in that a control instruction sent by each wireless node/cell participating in the multipoint cooperative transmission in CoMP is only used for controlling data transmission between the cell and the terminal, and does not control data transmission between the terminal and other nodes participating in the multipoint cooperative transmission, and the control instruction adopted by the existing CoMP is essentially based on the control instruction of the traditional local cell transmission/single stream transmission; another is that one of a set of nodes participating in CoMP is used as a control node, and the control node sends a scheduling command to control data transmission of other nodes participating in COPM transmission, for example, the patent application with the application number of 200910203029.9 entitled "a method, an apparatus and a user equipment for sending multi-cell scheduling information".

During soft handoff, the mobile station searches all pilot signals to probe existing Code Division Multiple Access (CDMA) channels and measure their strengths; when the mobile station detects that the Pilot signal Strength of the adjacent Pilot signal set or the remaining Pilot signal sets exceeds the handoff threshold T _ ADD, the mobile station sends a Pilot Strength Measurement Message (PSMM) to the serving base station.

The serving base station sends the PSMM to a Mobile Switching Center (MSC), the MSC notifies a handover destination base station to arrange a forward traffic channel to the Mobile station, the forward traffic channels of the two base stations send identical modulation symbols except for a power control subchannel, and the serving base station sends a handover indication Message (HDM) including contents of a PN number, a forward traffic channel number, a handover parameter, and the like of the handover destination base station to indicate the Mobile station to start handover.

The mobile station adds the PN number of the switching target base station into an effective pilot frequency set according to the received HDM, and demodulates the forward service channels of the two base stations at the same time. After the demodulation is completed, a Handover Complete Message (HCM) is transmitted.

As the mobile station moves, when the strength of a pilot signal in the valid pilot set is lower than T _ DROP, the mobile station starts a handoff to remove the timer T _ TDROP; the mobile station transmits PSMMs to both base stations when the timer T _ TDROP expires.

After receiving PSMM, two base stations send the message to MSC, MSC sends back corresponding HDM, base station transfers it to mobile station, mobile station moves the pilot signal out of active set according to HDM, and sends HCM.

Although the soft handover realizes the migration process of firstly connecting and then disconnecting the terminal between the wireless nodes in the cells with the same frequency, the time consumption of the soft handover of the terminal is large, and the time consumption of the physical layer measurement process can reach 200 milliseconds.

Therefore, the prior art cannot realize the rapid transparent migration or transparent movement of the terminal communication link between the adjacent wireless access points.

Disclosure of Invention

In order to solve the existing technical problem, embodiments of the present invention provide a method and an apparatus for controlling cooperation between wireless access points, which can ensure that a terminal moves between adjacent wireless access points quickly and transparently.

In order to achieve the above purpose, the technical solution of the embodiment of the present invention is realized as follows:

in a first aspect, an embodiment of the present invention provides a method for controlling cooperation between wireless access points, where the method is applied to a network side, and the method includes:

the second wireless access point uses the time-frequency resources equivalent to the first wireless access point, and sends scheduling information to the terminal in a macro diversity transmitting step among the wireless access points or a time-frequency equivalent replacing transmitting step among the wireless access points;

the step of macro diversity transmission between the wireless access points comprises the following steps:

the same scheduling information is sent to the terminal by the second wireless access point and the first wireless access point in a time interval sequence configured for a scheduling information transmission channel from the first wireless access point to the terminal in a time synchronization mode, a frequency synchronization mode and a symbol synchronization mode in at least one time interval; the scheduling information is used for assigning a time-frequency resource position of an uplink or downlink service channel for the terminal on at least one of the time-frequency resources used by the first wireless access point and the second wireless access point; or,

the time-frequency peer-to-peer replacement transmitting step among the wireless access points comprises the following steps:

and the second wireless access point transmits the scheduling information to the terminal in at least one time interval in the time interval sequence by using the frequency used by the first wireless access point before the at least one time interval.

In the foregoing solution, the sending scheduling information to the terminal includes:

and the second wireless access point sends a signal carrying the scheduling information to the terminal by using the same channel code or pseudo-random sequence as the first wireless access point.

in the same preset cell/access point identification information sending time window, the second wireless access point and the first wireless access point respectively send respective cell/access point identification information by using the same frequency; the cell/access point identification information sending time window occupies time resources in a time interval sequence configured for a scheduling information transmission channel from the first wireless access point to the terminal, or occupies time resources outside the time interval sequence configured for the scheduling information transmission channel from the first wireless access point to the terminal.

In the foregoing solution, the sending, by the second wireless access point and the first wireless access point, the cell/access point identification information respectively using the same frequency in the same predetermined cell/access point identification information sending time window includes:

the second wireless access point and the first wireless access point respectively transmit respective cell/access point identification information using frequencies within an LTE channel bandwidth.

when at least one of the first wireless access point and the second wireless access point is a macro cell access point, opening a time-frequency window for the downlink control channel of the first wireless access point and the second wireless access point on a first frequency band used by the downlink channel of the macro cell access point; the first wireless access point and the second wireless access point transmit scheduling information within the time-frequency window; the scheduling information is used for assigning a time-frequency resource position of a service channel for the terminal on a frequency band used by the second wireless access point; or,

opening a time-frequency window for downlink control channels of the first wireless access point and the second wireless access point on a second frequency band used by a single frequency network consisting of the first wireless access point and the second wireless access point; the first wireless access point and the second wireless access point transmit scheduling information within the time-frequency window.

In the above aspect, the method further includes:

acquiring measurement information of identification information bearing signals of at least two wireless access points in a cell/access point identification information sending time window reported by the terminal; wherein the at least two wireless access points include at least the first wireless access point and the second wireless access point;

judging whether the amplitude or the power of the identification information bearing signal of the second wireless access point is larger than the amplitude or the power of the identification information bearing signal of the first wireless access point; when the amplitude or the power of the identification information bearing signal of the second wireless access point is judged to be larger than the amplitude or the power of the identification information bearing signal of the first wireless access point, the second wireless access point is determined as a potential cooperative control node of the first wireless access point under the current position of a terminal, and the scheduling information is sent to the terminal through the second wireless access point; or,

judging whether the amplitude or the power of the identification information bearing signal of the second wireless access point is larger than a first threshold or not; and when the amplitude or the power of the identification information carrying signal of the second wireless access point is judged to be larger than a first threshold, the second wireless access point is determined as a potential cooperative control node of the first wireless access point under the current position of the terminal, and the scheduling information is sent to the terminal through the second wireless access point.

In the above aspect, the method further includes:

respectively acquiring an arrival phase of a first narrowband synchronous measurement signal sent by the first wireless access point and an arrival phase of a second narrowband synchronous measurement signal sent by the second wireless access point; wherein the bandwidths of the first narrowband synchronous measurement signal and the second narrowband synchronous measurement signal are less than 1 MHz;

determining a phase difference between a phase when the first narrowband synchronous measurement signal leaves the transmitting antenna interface of the first wireless access point and a phase when the second narrowband synchronous measurement signal leaves the transmitting antenna interface of the second wireless access point according to an arrival phase of the first narrowband synchronous measurement signal and an arrival phase of the second narrowband synchronous measurement signal;

and when the phase difference is larger than a preset phase error threshold, adjusting the starting time of a wireless frame sent by the first wireless access point or the second wireless access point.

In a second aspect, an embodiment of the present invention provides an apparatus for controlling cooperation between wireless access points, where the apparatus is applied to a network side, and the apparatus includes:

an inter-wireless access point macro-diversity transmitting module, configured to send the same scheduling information to a terminal in a time interval sequence configured for a scheduling information transmission channel from a first wireless access point to the terminal, in at least one time interval, according to a time synchronization, frequency synchronization, and symbol synchronization manner between the second wireless access point and the first wireless access point; the scheduling information is used for assigning a time-frequency resource position of an uplink or downlink service channel for the terminal on at least one of the time-frequency resources used by the first wireless access point and the second wireless access point;

an inter-ap time-frequency peer-to-peer replacement transmitting module, configured to, in a time interval sequence configured for a scheduling information transmission channel from the first ap to the terminal, interrupt transmission of scheduling information from the first ap to the terminal for at least one time interval, and transmit, by the second ap, scheduling information to the terminal using a frequency used by the first ap before the at least one time interval for the at least one time interval in the time interval sequence

In the foregoing solution, the inter-radio access point macro diversity transmitting module or the inter-radio access point time-frequency peer-to-peer replacement transmitting module is specifically configured to:

and sending a signal carrying the scheduling information to the terminal by the second wireless access point by using the same channel code or pseudo-random sequence as the first wireless access point.

respectively transmitting respective cell/access point identification information on the second wireless access point and the first wireless access point by using the same frequency in the same preset cell/access point identification information transmission time window; the cell/access point identification information sending time window occupies time resources in a time interval sequence configured for a scheduling information transmission channel from the first wireless access point to the terminal, or occupies time resources outside the time interval sequence configured for the scheduling information transmission channel from the first wireless access point to the terminal.

transmitting respective cell/access point identification information using frequencies within an LTE channel bandwidth on the second wireless access point and the first wireless access point, respectively.

In the above solution, the apparatus further comprises: the module for judging the potential cooperation control state between the wireless access points is used for:

In the above solution, the apparatus further comprises: the inter-wireless access point synchronization control module is used for:

In the embodiment of the invention, the second wireless access point uses the time-frequency resources which are equivalent to the first wireless access point, and sends the scheduling information to the terminal in the macro diversity transmission step between the wireless access points or the time-frequency equivalent replacement transmission step between the wireless access points, so that the equivalent replacement/transparent replacement of the control channel between the first wireless access point and the second wireless access point (the replacement of the control channel generated by the terminal is not perceived) is realized, and thus, the terminal can be quickly and transparently migrated or transparently moved between the adjacent wireless access points.

Drawings

In the drawings, which are not necessarily drawn to scale, like reference numerals may describe similar components in different views. Like reference numerals having different letter suffixes may represent different examples of similar components. The drawings illustrate generally, by way of example, but not by way of limitation, various embodiments discussed herein.

Fig. 1 is a schematic flow chart illustrating an alternative method for controlling cooperation between wireless access points according to an embodiment of the present invention;

fig. 2a is an alternative diagram of cooperative transmission of control channels between wireless access points according to an embodiment of the present invention;

fig. 2b is another alternative diagram of cooperative transmission of control channels between wireless access points according to an embodiment of the present invention;

fig. 3 is an alternative diagram illustrating the use of guard bands within the LTE channel bandwidth to transmit scheduling information according to an embodiment of the present invention;

fig. 4 is a schematic flow chart of another alternative method for controlling cooperation between wireless access points according to an embodiment of the present invention;

fig. 5 is a schematic diagram of an alternative structure of a cooperative control apparatus between wireless access points according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of another alternative configuration of the cooperative control apparatus between wireless access points in the embodiment of the present invention.

Detailed Description

In various embodiments of the invention: using time-frequency resources equivalent to the first wireless access point through the second wireless access point, and sending scheduling information to the terminal in a macro diversity transmission step among the wireless access points or a time-frequency equivalent replacement transmission step among the wireless access points; the step of macro diversity transmission between the wireless access points comprises the following steps: the same scheduling information is sent to the terminal by the second wireless access point and the first wireless access point in a time interval sequence configured for a scheduling information transmission channel from the first wireless access point to the terminal in a time synchronization mode, a frequency synchronization mode and a symbol synchronization mode in at least one time interval; the scheduling information is used for assigning a time-frequency resource position of an uplink or downlink service channel for the terminal on at least one of the time-frequency resources used by the first wireless access point and the second wireless access point; or, the time-frequency peer-to-peer replacement transmitting step between the wireless access points includes: and the second wireless access point transmits the scheduling information to the terminal in at least one time interval in the time interval sequence by using the frequency used by the first wireless access point before the at least one time interval.

The present invention will be described in further detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Example one

Referring to fig. 1, the method for controlling cooperation between wireless access points provided in this embodiment includes the following steps:

step 101, the second wireless access point uses the time frequency resource equivalent to the first wireless access point, and sends the scheduling information to the terminal in the macro diversity transmission step between the wireless access points or the time frequency equivalent replacement transmission step between the wireless access points.

Determining a second wireless access point as a cooperative control node of the first wireless access point at the current position of the terminal; the first wireless access point communicates with the terminal by using the first time-frequency resource.

Here, the first wireless access point and the second wireless access point may be a cell/base station or a wireless Access Point (AP). The terminal can be communication equipment such as smart phones, tablet computers, notebook computers, wearable equipment (such as smart watches).

102, the step of transmitting macro diversity among the wireless access points includes: the same scheduling information is sent to the terminal by the second wireless access point and the first wireless access point in a time interval sequence configured for a scheduling information transmission channel from the first wireless access point to the terminal in a time synchronization mode, a frequency synchronization mode and a symbol synchronization mode in at least one time interval; the scheduling information is used to assign a time-frequency resource location of an uplink or downlink traffic channel to the terminal on at least one of the time-frequency resources used by the first wireless access point and the second wireless access point.

103, the step of time-frequency peer-to-peer replacement transmitting among the wireless access points comprises the following steps: and the second wireless access point transmits the scheduling information to the terminal in at least one time interval in the time interval sequence by using the frequency used by the first wireless access point before the at least one time interval.

In a specific implementation, the sending of the scheduling information to the terminal includes the following steps: the second wireless access point may transmit a signal carrying scheduling information to the terminal using the same channel code or pseudo-random sequence as the first wireless access point. Optionally, the second wireless access point may send a signal carrying scheduling information to the terminal using the same cell scrambling code or pseudo-random sequence characterizing the cell as the first wireless access point.

In practice, the second ap needs to know the time interval sequence configured for the scheduling information transmission channel from the first ap to the terminal.

Referring to fig. 2a, the first time interval sequence configured for the scheduling information transmission channel from the first wireless access point 201 to the first terminal 210 includes: a time interval A, a time interval B and a time interval C;

the second sequence of time intervals comprises: time interval a, time interval b, time interval c;

the time interval a corresponds to the time interval A, and the time interval a and the time interval A are synchronous in starting and stopping time or overlap in duration; the time interval B corresponds to the time interval B, and the time interval B and the time interval B are synchronous in starting and stopping time or overlapped in duration; time interval C corresponds to time interval C, which is synchronized with time interval C in start and stop time or overlaps in duration.

When the scheduling information is transmitted in the inter-radio access point macro diversity transmission procedure described in step 102, the second radio access point 202 transmits the same scheduling information to the first terminal in time synchronization, frequency synchronization, and symbol synchronization with the first radio access point in a second time interval sequence including the time intervals a to c corresponding to the first time interval sequence.

When the scheduling information is transmitted in the time-frequency equivalent alternative transmission step among the wireless access points described in step 103, the first wireless access point 201 transmits the scheduling information in the time interval a included in the first time interval sequence, does not transmit the scheduling information in the time intervals B and C subsequent to the time interval a included in the first time interval sequence, and the second wireless access point 202 does not transmit the scheduling information in the time interval a corresponding to the time interval a, and transmits the scheduling information to the first terminal 210 in the time interval B corresponding to the time interval B. The frequency with which the second wireless access point 202 transmits the scheduling information in time interval b is the same as the frequency with which the first wireless access point 201 transmits the scheduling information in time interval a.

Compared with the prior art, the method has the defect that the rapid transparent migration or transparent movement of the terminal communication link between the adjacent wireless access points cannot be realized; in this embodiment, the second wireless access point uses the time-frequency resource equivalent to the first wireless access point, and sends the scheduling information to the terminal in the macro diversity transmission step between the wireless access points or the time-frequency equivalent replacement transmission step between the wireless access points, so as to implement equivalent replacement or equivalent migration/transparent replacement of the control channel between the wireless access points (the replacement process of the control channel occurring to the terminal is imperceptible), and thus, it is possible to implement rapid transparent migration or transparent movement of the terminal between the adjacent wireless access points.

Example two

Based on the foregoing embodiments, in the method for controlling cooperation between wireless access points provided in this embodiment, a method for sending scheduling information to a terminal includes: and in the same preset cell/access point identification information sending time window, the second wireless access point and the first wireless access point respectively send respective cell/access point identification information by using the same frequency.

Here, the cell/ap id transmission time window occupies time resources within a time interval sequence configured for the first ap-to-terminal scheduling information transmission channel or occupies time resources outside the time interval sequence configured for the first ap-to-terminal scheduling information transmission channel.

The cell/access point identification information includes at least one or a combination of the following:

cell/wireless access point identification information;

current transmission power information of a cell/wireless access point;

frequency band information supported by a cell/wireless access point;

current spectrum use state information of a cell/wireless access point;

current channel configuration state information of the cell/wireless access point.

In practice, an optional implementation manner that the second wireless access point and the first wireless access point respectively transmit their cell/access point identification information using the same frequency within the same predetermined cell/access point identification information transmission time window includes: the second wireless access point and the first wireless access point respectively send respective cell/access point identification information by using the frequency in the LTE channel bandwidth; optionally, the second wireless access point and the first wireless access point transmit their respective cell/access point identification information using a guard band within the LTE channel bandwidth.

Referring to fig. 2b, T1 and T2 are time windows for sending cell/access point id information configured on the air interface of the first wireless access point 201, and T1 and T2 are time windows for sending cell/access point id information configured on the air interface of the second wireless access point 202; the cell/access point identification information transmission time windows T1 and T1 are synchronized at the start and end times or overlap in duration, and T2 and T2 are synchronized at the start and end times or overlap in duration; transmitting cell/access point identification information using at least one pair of cell/access point identification information transmission time windows T1 and T1, T2 and T2; the first wireless access point 201 and the second wireless access point 202 transmit the respective cell/access point identification information using the same frequency within any pair of time windows among the cell/access point identification information transmission time windows T1 and T1, T2 and T2; for example, the first wireless access point 201 transmits the respective cell/access point identification information using the same frequency within the cell/access point identification information transmission time window T1 and the second wireless access point 202 within the cell/access point identification information transmission time window T1. Optionally, at least one of T1, T2 is included in the time range of time interval a, and at least one of T1, T2 is included in the time range of time interval a.

In the embodiment, different cell/node identification signals are synchronously sent in the same time frequency window between adjacent wireless access points, and the terminal acquires identification information and signal strength information of different wireless access points in the same time frequency window, so that the defects that the potential channel state between the terminal and the wireless access points cannot be quickly acquired in real time and the quick and transparent migration or transparent movement of a terminal communication link between the adjacent wireless access points cannot be realized in the prior art are overcome, and the high-speed movement of the terminal between the wireless access points is easy to realize.

EXAMPLE III

Based on the foregoing embodiments, in the method for controlling cooperation between wireless access points provided in this embodiment, a method for sending scheduling information to a terminal includes:

when at least one of the first wireless access point and the second wireless access point is a macro cell access point, opening a time-frequency window used by a downlink control channel of the first wireless access point and the second wireless access point on a first frequency band used by the macro cell access point; the first wireless access point and the second wireless access point send scheduling information in a time-frequency window; the scheduling information is used for assigning the time-frequency resource position of the service channel for the terminal on the frequency band used by the second wireless access point; or,

opening a time frequency window used by a first wireless access point and a second wireless access point downlink control channel on a second frequency band used by a single frequency network consisting of the first wireless access point and the second wireless access point; the first wireless access point and the second wireless access point send scheduling information in a time-frequency window; the scheduling information is used to assign a time-frequency resource location of a traffic channel to the terminal on a frequency band used by the second wireless access point.

In practice, the time-frequency window includes a time interval configured for a scheduling information transmission channel from the first wireless access point or the second wireless access point to the terminal in time.

In this embodiment of the method, in order to flexibly use a frequency spectrum, a time-frequency window used by downlink control channels for the first and second wireless access points to transmit scheduling information is opened on a first frequency band, or a time-frequency window used by downlink control channels for the first and second wireless access points to transmit scheduling information is opened on a first frequency band used by a single frequency network composed of the first and second wireless access points, where a position of the time-frequency window on the first frequency band includes, as shown in fig. 3: opening a time-frequency window on a guard band 421/422 set in the LTE channel bandwidth; the guard band set in the LTE channel bandwidth comprises a guard band in the LTE uplink channel bandwidth and/or a guard band in the LTE downlink channel bandwidth. Specifically, a specific method for opening up a time-frequency window used by a downlink control channel for transmitting scheduling information includes: at least one of the resource blocks 411 and 412 is used as a frequency resource occupied by a time-frequency window used by the downlink control channels of the first and second wireless access points.

The LTE system supports different Channel bandwidths (Channel bandwidth BW channels), and there are various ways to transmit the Number of Resource Blocks (NRB) of bandwidth configuration (Transmission bandwidth configuration) and Guard bandwidth (Guard band bandwidth) in the LTE Channel bandwidth in the corresponding Channel of LTE, where the width of one Resource Block (RB) is: 15kHz × 12 ═ 180 kHz.

The embodiment also provides a method for receiving measurement report information or service request information sent by a terminal by using an uplink channel, which specifically includes:

opening a time-frequency window for the uplink control channel of the first wireless access point and the second wireless access point to use on the first frequency band, and receiving the measurement report information or the service request information of the first terminal by at least one of the first wireless access point and the second wireless access point in the time-frequency window; or,

opening a time-frequency window for the uplink control channel of the first wireless access point on a second frequency band used by a diversity receiving channel consisting of the first wireless access point and the second wireless access point, and receiving the measurement report information or the service request information of the first terminal by at least one of the first wireless access point and the second wireless access point in the time-frequency window.

Example four

Based on the first embodiment, the present embodiment further provides a method for determining a potential coordination control state between wireless access points on the basis of the first embodiment. Referring to fig. 4, the method for controlling cooperation between wireless access points according to this embodiment further includes a method for determining a potential cooperation control state between wireless access points, which specifically includes the following steps:

step 401, obtaining measurement information of identification information bearing signals of at least two wireless access points in a cell/access point identification information sending time window reported by a terminal; wherein the at least two wireless access points comprise at least a first wireless access point and a second wireless access point;

step 402, judging whether the amplitude or power of the identification information bearing signal of the second wireless access point is larger than the amplitude or power of the identification information bearing signal of the first wireless access point; when the amplitude or the power of the identification information bearing signal of the second wireless access point is judged to be larger than the amplitude or the power of the identification information bearing signal of the first wireless access point, the second wireless access point is determined as a potential cooperative control node of the first wireless access point under the current position of the terminal; or,

judging whether the amplitude or the power of the identification information bearing signal of the second wireless access point is larger than a first threshold or not; and when the amplitude or the power of the identification information carrying signal of the second wireless access point is judged to be larger than a first threshold, the second wireless access point is determined as a potential cooperative control node of the first wireless access point under the current position of the terminal.

Specifically, whether the amplitude of the identification information carrying signal of the second wireless access point is greater than the amplitude of the identification information carrying signal of the first wireless access point is judged; when the amplitude of the identification information bearing signal of the second wireless access point is judged to be larger than that of the identification information bearing signal of the first wireless access point, the second wireless access point is determined as a potential cooperative control node of the first wireless access point under the current position of the terminal; or,

judging whether the power of the identification information bearing signal of the second wireless access point is larger than that of the identification information bearing signal of the first wireless access point; when the power of the identification information carrying signal of the second wireless access point is judged to be larger than that of the identification information carrying signal of the first wireless access point, the second wireless access point is determined as a potential cooperative control node of the first wireless access point under the current position of the terminal; or,

judging whether the amplitude of the identification information bearing signal of the second wireless access point is greater than a first threshold or not; when the amplitude of the identification information bearing signal of the second wireless access point is judged to be larger than a first threshold, the second wireless access point is determined as a potential cooperative control node of the first wireless access point under the current position of the terminal; or,

judging whether the power of the identification information bearing signal of the second wireless access point is greater than a first threshold or not; and when the power of the identification information carrying signal of the second wireless access point is judged to be larger than the first threshold, the second wireless access point is determined as a potential cooperative control node of the first wireless access point under the current position of the terminal.

Step 403, sending the scheduling information to the terminal through the second wireless access point.

Specifically, the magnitude of the amplitude or power of the identification information carrying signal of the first wireless access point and the second wireless access point is compared, if the magnitude or power of the identification information carrying signal of the second wireless access point is greater than that of the first wireless access point, the second wireless access point is judged as a potential cooperative control node at the current position of the first terminal, and the scheduling information is sent to the first terminal through the second wireless access point; otherwise, judging the second wireless access point as a non-potential cooperative control node under the current position of the first terminal, and not sending the scheduling information to the first terminal through the second wireless access point; or,

comparing the amplitude or power of the identification information carrying signal of the first wireless access point with a first threshold, judging the second wireless access point as a potential cooperative control node at the current position of the first terminal if the amplitude or power of the identification information carrying signal of the first wireless access point is larger than the first threshold, and sending the scheduling information to the first terminal through the second wireless access point; otherwise, the second wireless access point is judged to be a non-potential cooperative control node under the current position of the first terminal, and the scheduling information is not sent to the first terminal through the second wireless access point. Optionally, the first threshold value is greater than or equal to-80 dBm.

The method for judging the potential cooperation control state between the wireless access points overcomes the defect that the potential cooperation state facing to the specific mobile terminal between the adjacent wireless access points can not be quickly determined in the prior art, and is easy to realize the high-speed movement of the terminal between the wireless access points.

EXAMPLE five

Based on the first embodiment, the present embodiment further provides a method for performing synchronization control between wireless access points on the basis of the first embodiment, and specifically includes the following steps:

respectively acquiring an arrival phase of a first narrowband synchronous measurement signal sent by a first wireless access point and an arrival phase of a second narrowband synchronous measurement signal sent by a second wireless access point; wherein the bandwidths of the first narrowband synchronous measurement signal and the second narrowband synchronous measurement signal are less than 1 MHz;

determining a phase difference between a phase when the first narrowband synchronous measurement signal leaves a transmitting antenna interface of the first wireless access point and a phase when the second narrowband synchronous measurement signal leaves a transmitting antenna interface of the second wireless access point according to an arrival phase of the first narrowband synchronous measurement signal and an arrival phase of the second narrowband synchronous measurement signal;

and when the phase difference is larger than a preset phase error threshold, adjusting the starting time of the wireless frame sent by the first wireless access point or the second wireless access point.

In practice, the method for performing synchronization control between wireless access points provided in this embodiment may further include any one of the following implementation manners:

implementation mode 1) and a synchronization control method based on time difference of arrival, which use a broadband synchronization measurement signal to perform air interface synchronization control between wireless access points, the steps include:

the first/second broadband synchronous measurement signal sent by the first/second wireless access point is received by an arrival time measurement unit positioned at the second/wireless access point, the bandwidth of the first/second broadband synchronous measurement signal is more than 1.25MHz, and the arrival time measurement unit at the second/wireless access point acquires the arrival time TOA1/TOA2 of the first/second synchronous measurement signal; determining a time difference (T1-T2) between times T1 and T2 when the first and second broadband synchronous measurement signals leave the transmitting antenna ports of the first and second wireless access points by using the arrival time TOA1/TOA2 and the distance between the first wireless access point and the second wireless access point, and adjusting the starting time of wireless frames transmitted by the first or second wireless access points when the time difference (T1-T2) is greater than a predetermined synchronization error threshold so that the time difference (T1-T2) is less than the predetermined synchronization error threshold; or

The first and second broadband synchronous measurement signals transmitted by the first and second wireless access points are received by an arrival time measurement unit located in an area effectively covered by the second and second wireless access points, the position of the arrival time measurement unit relative to the first and second wireless access points is known, the bandwidth of the first and second broadband synchronous measurement signals is more than 1.25MHz, and the arrival time measurement unit acquires the arrival time TOA1/TOA2 of the first and second synchronous measurement signals; and determining a time difference (T1-T2) between times T1 and T2 when the first and second broadband synchronous measurement signals leave the port of the transmitting antenna of the first and second wireless access points by using the time of arrival TOA1/TOA2 and the distance between the time of arrival measurement unit and the first wireless access point and the second wireless access point, and adjusting the starting time of the wireless frames transmitted by the first or second wireless access points when the time difference (T1-T2) is greater than a preset synchronization error threshold so that the time difference (T1-T2) is less than the preset synchronization error threshold. Optionally, the value of the synchronization error threshold in the implementation mode 1 may be less than or equal to 10 microseconds; or, the value of the synchronization error threshold may be a value less than or equal to 1 microsecond; alternatively, the synchronization error threshold may take a value less than or equal to 0.01 microseconds.

Implementation mode 2) and a synchronization control method based on an arrival phase difference, which use a narrowband synchronization measurement signal to perform air interface synchronization control between wireless access points, the method comprises the following steps:

receiving a first/second narrowband synchronous measurement signal transmitted by a first/second wireless access point by an arrival Phase measurement unit positioned at a second/wireless access point, wherein the bandwidth of the first/second narrowband synchronous measurement signal is less than 1MHz, the first/second narrowband synchronous measurement signal is any one of a sine amplitude modulation signal, a Gaussian amplitude modulation signal and a Sinc amplitude modulation signal, and the arrival Phase measurement unit at the second/wireless access point acquires the arrival Phase POA1/POA2(Phase arrival) of the first/second synchronous measurement signal; removing propagation phase shift introduced by the distance between the first wireless access point and the second wireless access point in the arrival phase POA1/POA2 to obtain a phase difference (P1-P2) between phases P1 and P2 when the first and second narrowband synchronous measurement signals leave the interfaces of the transmitting antennas of the first and second wireless access points, and when the phase difference (P1-P2) is greater than a preset phase error threshold, adjusting the starting time of a wireless frame transmitted by the first or second wireless access point to enable the phase difference (P1-P2) to be less than the preset synchronization error threshold; or

The first and second narrowband synchronous measurement signals transmitted by the first and second wireless access points are received by an arrival phase measurement unit located in an area effectively covered by the second and wireless access points, the position of the arrival phase measurement unit relative to the first and second wireless access points is known, the bandwidth of the first/second narrowband synchronous measurement signal is less than 1MHz, the first/second narrowband synchronous measurement signal is any one of a sine amplitude modulation signal, a Gaussian amplitude modulation signal and a Sinc amplitude modulation signal, and the arrival phase measurement unit at the second/wireless access point acquires the arrival phases POA1/POA2 of the first/second synchronous measurement signal; and removing propagation phase shift introduced by the distance between the first wireless access point and the second wireless access point in the arrival phase POA1/POA2 to obtain the phase difference (P1-P2) between the phases P1 and P2 when the first and second narrowband synchronous measurement signals leave the interfaces of the transmitting antennas of the first and second wireless access points, and when the phase difference (P1-P2) is greater than a preset phase error threshold, adjusting the starting time of wireless frames transmitted by the first or second wireless access points to enable the phase difference (P1-P2) to be less than the preset synchronization error threshold. In practice, the value of the phase error threshold in the implementation mode 2 may be a value less than or equal to 2 degrees; alternatively, the value of the synchronization error threshold may be a value less than or equal to 0.2 degrees; alternatively, the synchronization error threshold may take a value less than or equal to 0.02 microseconds. The period of one sine wave signal corresponds to 360 degrees.

In this embodiment, the air interface synchronization between adjacent wireless access points is realized by using a narrowband signal, so that the complexity and cost of synchronization can be reduced.

Optionally, the bandwidth of the first/second narrowband synchronous measurement signal is 200 KHz; optionally, the first/second narrowband synchronization measurement signals and a narrowband Internet Of Things (NB-IOT, Narrow Band-Internet Of Things) share the same carrier frequency in a time division manner.

The method for synchronously controlling the wireless access points provided by the embodiment of the invention overcomes the defects that the potential channel state between the terminal and the wireless access points can not be rapidly acquired in real time and the rapid transparent migration or transparent movement of the terminal communication link between the adjacent wireless access points can not be realized in the prior art, and is easy to realize the high-speed movement of the terminal between the wireless access points.

EXAMPLE six

In correspondence with the description of the first embodiment, the present embodiment also describes an inter-ap coordination control apparatus, which can be applied to a network side; the inter-wireless-access-point cooperation control apparatus may be implemented in various ways, for example, by implementing all components of the apparatus in a base station, a wireless access point, or by implementing the components in the apparatus in a coupled manner on the base station or wireless access point side. Referring to fig. 5, the inter-wireless access point cooperation control means 510 includes:

an inter-wireless access point macro diversity transmitting module 501, configured to send the same scheduling information to a terminal according to time synchronization, frequency synchronization, and symbol synchronization between the second wireless access point and the first wireless access point in at least one time interval on a time interval sequence configured for a scheduling information transmission channel from the first wireless access point to the terminal; the scheduling information is used for assigning a time-frequency resource position of an uplink or downlink service channel for the terminal on at least one of the time-frequency resources used by the first wireless access point and the second wireless access point;

an inter-wireless access point time-frequency peer-to-peer replacement transmitting module 502, configured to, in a time interval sequence configured for a scheduling information transmission channel from the first wireless access point to the terminal, interrupt transmission of scheduling information to the terminal by the first wireless access point in at least one time interval, and transmit scheduling information to the terminal by the second wireless access point using a frequency used by the first wireless access point before the at least one time interval in the time interval sequence.

Compared with the prior art, the method has the defect that the rapid transparent migration or transparent movement of the terminal communication link between the adjacent wireless access points cannot be realized; in this embodiment, the second wireless access point uses a time-frequency resource equivalent to the first wireless access point, and sends scheduling information to the terminal through the inter-wireless-access-point macro-diversity transmission module and the inter-wireless-access-point time-frequency equivalent replacement transmission module, so as to implement equivalent replacement or equivalent migration of a control channel between wireless access points, and implement non-aware (transparent) transfer of the terminal between adjacent wireless access points, and thus, it is possible to ensure rapid transparent migration or transparent movement of the terminal between adjacent wireless access points.

On the basis of the above embodiment, the inter-wireless-access-point macro-diversity transmitting module 501 or the inter-wireless-access-point time-frequency peer-to-peer replacing transmitting module 502 is specifically configured to: and sending a signal carrying the scheduling information to the terminal by the second wireless access point by using the same channel code or pseudo-random sequence as the first wireless access point.

On the basis of the foregoing embodiment, the inter-radio access point macro diversity transmitting module 501 or the inter-radio access point time-frequency peer-to-peer replacing transmitting module 502 is specifically configured to: respectively transmitting respective cell/access point identification information on the second wireless access point and the first wireless access point by using the same frequency in the same preset cell/access point identification information transmission time window; the cell/access point identification information sending time window occupies time resources in a time interval sequence configured for a scheduling information transmission channel from the first wireless access point to the terminal, or occupies time resources outside the time interval sequence configured for the scheduling information transmission channel from the first wireless access point to the terminal.

On the basis of the above embodiment, the inter-wireless-access-point macro-diversity transmitting module 501 or the inter-wireless-access-point time-frequency peer-to-peer replacing transmitting module 502 is specifically configured to: transmitting respective cell/access point identification information using frequencies within an LTE channel bandwidth on the second wireless access point and the first wireless access point, respectively.

On the basis of the above embodiment, the inter-wireless-access-point macro-diversity transmitting module 501 or the inter-wireless-access-point time-frequency peer-to-peer replacing transmitting module 502 is specifically configured to:

In addition to the structure shown in fig. 5, the present embodiment further describes another inter-radio access point cooperation control apparatus, and referring to fig. 6, the inter-radio access point cooperation control apparatus 610 shown in fig. 6 also includes: a macro diversity transmitting module 501 between wireless access points, and a time-frequency equivalent replacing transmitting module 502 between the wireless access points, and each module also has the functions and connection relations shown in fig. 5; meanwhile, the inter-wireless access point cooperation control apparatus 610 shown in fig. 6 further includes:

the inter-wireless access point potential cooperation control state determining module 601 is configured to:

Optionally, the apparatus further comprises: an inter-wireless access point synchronization control module 602 configured to:

In practical application, the inter-wireless-access-point macro-diversity transmitting module 501, the inter-wireless-access-point time-frequency equivalent replacing transmitting module 502, the inter-wireless-access-point potential cooperation control state determining module 601, and the inter-wireless-access-point synchronization control module 602 may be implemented by a Central Processing Unit (CPU), a microprocessor unit (MPU), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA), or the like, which is located in the inter-wireless-access-point cooperation control apparatus.

EXAMPLE seven

This embodiment describes a computer-readable medium, which may be a ROM (e.g., read-only memory, FLASH memory, transfer device, etc.), a magnetic storage medium (e.g., magnetic tape, disk drive, etc.), an optical storage medium (e.g., CD-ROM, DVD-ROM, paper card, paper tape, etc.), and other well-known types of program memory; the computer-readable medium has stored therein computer-executable instructions that, when executed, cause at least one processor to perform operations comprising:

the macro diversity transmitting step among the wireless access points comprises the following steps: the same scheduling information is sent to the terminal by the second wireless access point and the first wireless access point in a time interval sequence configured for a scheduling information transmission channel from the first wireless access point to the terminal in a time synchronization mode, a frequency synchronization mode and a symbol synchronization mode in at least one time interval; the scheduling information is used for assigning a time-frequency resource position of an uplink or downlink service channel for the terminal on at least one of the time-frequency resources used by the first wireless access point and the second wireless access point; or,

the time-frequency equivalent replacement transmitting step among the wireless access points comprises the following steps: and the second wireless access point transmits the scheduling information to the terminal in at least one time interval in the time interval sequence by using the frequency used by the first wireless access point before the at least one time interval.

As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of a hardware embodiment, a software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.

The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.

Claims

1. A method for controlling cooperation between wireless access points is applied to a network side, and the method comprises the following steps:

2. The method of claim 1, wherein the sending scheduling information to the terminal comprises:

3. The method according to claim 1 or 2, wherein the sending scheduling information to the terminal comprises:

4. The method of claim 3, wherein the second wireless access point and the first wireless access point respectively transmit their cell/access point identification information using the same frequency within the same predetermined cell/access point identification information transmission time window, comprising:

5. The method according to claim 1 or 2, wherein the sending scheduling information to the terminal comprises:

6. The method of claim 1, further comprising:

7. The method of claim 1, further comprising:

8. An apparatus for controlling cooperation between wireless access points, the apparatus being applied to a network side, the apparatus comprising:

and the inter-wireless access point time-frequency peer-to-peer replacement transmitting module is configured to interrupt the transmission of the scheduling information from the first wireless access point to the terminal in at least one time interval in a time interval sequence configured for a scheduling information transmission channel from the first wireless access point to the terminal, and the second wireless access point transmits the scheduling information to the terminal by using the frequency used by the first wireless access point before the at least one time interval in the time interval sequence.

9. The apparatus according to claim 8, wherein the inter-ap macro-diversity transmitting module or the inter-ap time-frequency peer-to-peer replacement transmitting module is specifically configured to:

10. The apparatus according to claim 8 or 9, wherein the inter-ap macro-diversity transmitting module or the inter-ap time-frequency peer-to-peer replacing transmitting module is specifically configured to:

11. The apparatus according to claim 10, wherein the inter-ap macro-diversity transmitting module or the inter-ap time-frequency peer-to-peer replacement transmitting module is specifically configured to:

12. The apparatus according to claim 8 or 9, wherein the inter-ap macro-diversity transmitting module or the inter-ap time-frequency peer-to-peer replacing transmitting module is specifically configured to:

13. The apparatus of claim 8, further comprising a module for determining the potential coordination control state between wireless access points, configured to:

14. The apparatus of claim 8, further comprising an inter-wireless access point synchronization control module configured to: