WO2013097770A1 - Timing control method and access point for heterogeneous network - Google Patents

Abstract

The present invention is applied to the field of communications, and provided are a timing control method and an access point for a heterogeneous network. The method comprises the following steps: determining a timing reference AP of a target AP in a heterogeneous network, the target AP being an AP for which timing must be carried out; and the target AP adjusting uplink receipt timing and/or downlink transmission timing by using the timing reference AP as a timing reference. The method provided in the present invention can achieve the synchronization of a plurality of AP downlink signals at the user side, and receive the synchronization of user uplink signals which come from close geographic locations and have different service APs at the AP side, thereby improving the performance of relevant physical channels such as master synchronization channels, secondary synchronization channels and the like in the heterogeneous network, and facilitating the realization of enhancement techniques, such as CoMP and the like.

Description

 Timing control method and access point for heterostructure network This application claims to be Chinese patent filed on December 28, 2011, with the application number of 201110446487.2, and the invention titled "Timer Control Method and Access Point of Different Structure Network" Priority of the application, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD The present invention relates to the field of wireless communication technologies, and in particular, to a timing control method and an access point of a heterostructure network.

BACKGROUND With the widespread application of data services in wireless services, the utilization efficiency of spectrum resources is increasingly valued by communication equipment vendors and operators, thereby generating various methods for improving spectrum efficiency, such as SU-. MIMO (Single User Multiple Input Multiple Output), MU-MIMO (Multiple User Multiple Input Multiple Output), high-order modulation, and currently heterogeneous networks (Heterogeneous) Network, Het-Net) technology. Several of the above methods for improving spectral efficiency have been adopted in the 3GPP LTE standard.

Het-Net is currently a hot enhancement technology. The core of the solution is to deploy a certain number of low power nodes (LPNs) within the coverage of the macro cell, and use cell splitting technology or spectrum multiplexing technology to increase the available. Spectrum resources to increase throughput per unit of geographic area. Compared to a macro cell, the LPN has a relatively low total downlink transmit power, so the LPN has a smaller coverage. The difference from the Homogeneous Network (Homo-Net) is that in the Het-Net macro cell, the LPNs can completely overlap on the coverage area, while in the Homo-Net, there is only overlap at the cell edge. In the case of Het-Net, the uplink and downlink interferences in the small interval increase, and the interference situation is more complicated. In order to achieve interference suppression in the Het-Net scenario, the base station Interference between cells can be interworked through the X2 interface, thereby achieving coordination of interference. For the convenience of description, the following definitions of several technical terms are given:

 Service Access Point (AP): Provides a timed AP for the user's downlink and/or uplink transmission signals, and the service AP is a node that provides uplink and/or downlink services to the user according to certain rules. Each user has at least one service AP.

 Collaboration AP: A node that provides uplink and downlink services for users based on certain rules. Each user can have no collaborative APs.

 Non-serving AP: For a given user, APs other than the serving AP and the cooperative AP. Referring to FIG. 1 , a relative timing relationship diagram between a service AP and a non-serving AP provided by the prior art, where the service AP of the user UE1 (User End) is an API, and the downlink transmission timings of the API and the AP2 are aligned. The degree of downlink reception synchronization of the downlink transmission signal of each AP on the user side and the uplink reception synchronization degree of the uplink transmission signal of each AP in each AP are analyzed.

 In the downlink, the downlink interference signal from the non-serving AP and the service AP are caused by the difference in propagation delay between the serving AP, the non-serving AP and the target user, or other reasons such as the use of the repeater (Repeater). The downlink interfered signal appears symbol-level asynchronous on the user side. As shown in FIG. 2, since the signal delay lag1 of the API to the UE1 is larger than the signal delay lag2 of the AP2 to the UE2, the downlink received signal is asynchronous on both the UE1 side and the UE2 side, and the asynchronous makes CoMP (Coordinated). Multiple Point (multipoint cooperation) technologies cannot be implemented, and performance of related physical channels (such as Primary Synchronization Channel (PSS) and Secondary Synchronization Channel (SSS)) deteriorates.

Similarly, for the uplink, the uplink transmit timing advance (TA) determined by the serving AP may not enable the uplink signal of the user to be implemented in both the serving AP and the non-serving AP after the propagation delay. Symbol synchronization. As shown in FIG. 3, the signal delay of AP2 to UE2 is lag2, and the signal delay of the API to UE1 is lag1, whereby the uplink timing of the uplink transmission (relative to the downlink reception timing) of the user side UE1 and UE2 is 21agl and respectively. 21ag2, in the uplink timing situation, on the API side, the timings of the uplink receiving signal (such as (4) in FIG. 3) and the downlink transmitting signal (such as (1) in FIG. 3) for the user UE1 are aligned. On the AP2 side, The timings of the uplink received signal (FIG. 3 (5)) and the downlink transmit signal (FIG. 3 (2)) for the user UE2 are also aligned, but the uplink signals of the UE1 and UE2 are both in the API and the AP2. It is asynchronous, and the reception time difference of (7) and the corresponding signal in Fig. 3 exceeds the length of the Cyclic Prefix (CP). Such an uplink transmission signal is asynchronous at the symbol level of the receiving AP, which may cause performance degradation of the uplink control channel, and enhancement techniques such as uplink CoMP cannot be used.

SUMMARY OF THE INVENTION An object of the present invention is to provide a timing control method for a heterogeneous network, which aims to synchronize the downlink signals of multiple APs on the user side, and receive users with different service APs from geographical locations on the AP side. The problem of upstream signal synchronization.

 In an aspect, a timing control method for a heterogeneous network is provided, where the method includes: determining a timing reference AP of a target access point AP in a heterogeneous network, where the target AP is an AP that needs to be timed, where Determining the timing reference AP of the target AP in the heterogeneous network includes: determining, according to at least one of a coverage size of the searched AP, a transmit power, and a received power of a signal that the target AP receives the searched AP Determining, by the timing reference AP, the timing reference AP of the target AP according to whether the searched AP has the information of the target AP;

 The target AP adjusts the uplink receiving timing and/or the downlink transmitting timing by using the timing reference AP as a timing reference.

 On the other hand, another timing control method for a heterogeneous network is provided, and the method includes:

The timing reference access point AP provides a timing reference for the target AP, so that the target AP adjusts the uplink receiving timing and/or the downlink transmitting timing by using the timing reference AP as a timing reference, where the timing reference AP is The target AP is based on the size of the searched AP, An AP that is a timing reference of the target AP determined by at least one of a transmit power and a received power of a signal that the target AP receives the searched AP, or whether the target AP has the target according to the searched AP The AP that is the timing reference of the target AP determined by the information of the AP, and the target AP is an AP that needs to be timed in the heterogeneous network.

 On the other hand, an access point is also provided, where the access point is a target AP that needs to be timed in a heterogeneous network, and the access point includes:

 a timing reference AP determining unit, configured to: the timing reference AP of the target access point AP, where the determining the timing reference AP of the target AP comprises: receiving, according to the coverage size of the searched AP, the transmit power, and the target AP receiving the search Determining, by at least one of the received power of the signal of the AP, the timing reference AP of the target AP, or determining the timing reference AP of the target AP according to whether the searched AP has the information of the target AP;

 The timing adjustment unit is configured to adjust the uplink receiving timing and/or the downlink transmitting timing of the target AP by using the timing reference AP as a timing reference.

 On the other hand, another access point is provided, where the access point is used to provide a timing reference for the target AP, so that the target AP uses the access point as a timing reference to perform uplink receiving timing and/or Or adjusting the downlink transmission timing, where the access point is determined by the target AP according to at least one of a coverage size of the searched AP, a transmit power, and a received power of a signal that the target AP receives the searched AP. The AP that is the timing reference of the target AP, or the AP that is the timing reference of the target AP determined by the target AP according to the information of the target AP in the searched AP, the target AP is A timed AP is required in a heterogeneous network.

In the embodiment of the present invention, the target AP determines the timing reference AP of the target AP according to at least one of the coverage size of the searched AP, the transmit power, and the received power of the target AP receiving the searched AP. An appropriate AP can be determined as the timing reference AP of the target AP, and the timing reference AP is used to provide a timing reference for the target AP, and the uplink and downlink timings of the target AP are adjusted, thereby implementing synchronization of downlink signals of multiple APs on the user side. in The AP side receives uplink signal synchronization from users with different service APs with similar geographical locations, so as to improve the performance of related physical channels such as the primary synchronization channel and the secondary synchronization channel in the heterogeneous network, so that CoMP and other enhancement technologies can be implemented.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram showing a relative timing relationship between a service AP and a non-serving AP according to the prior art; FIG. 2 is an asynchronous example of a downlink received signal of a heterogeneous network provided by the prior art on the user side;

 3 is a schematic diagram of symbol level asynchronous of an uplink transmission signal of a heterogeneous network provided by the prior art on a receiving AP side;

 4 is a flowchart of an implementation of a timing control method for a heterogeneous network according to an embodiment of the present invention; FIGS. 5a and 5b are diagrams showing an example of a first timing control manner according to an embodiment of the present invention; and FIGS. 6a and 6b are implementations of the present invention; FIG. 7a, FIG. 7b are diagrams showing an example of a third timing control manner according to an embodiment of the present invention; and FIGS. 8a and 8b are fourth timing control according to an embodiment of the present invention. FIG. 9a, FIG. 9b are diagrams showing an example of a fifth timing control mode according to an embodiment of the present invention; and FIGS. 10a and 10b are diagrams showing an example of a sixth timing control mode according to an embodiment of the present invention; The lib is an example of the seventh timing control mode provided by the embodiment of the present invention; and FIGS. 12a and 12b are exemplary diagrams of the eighth timing control mode provided by the embodiment of the present invention; FIGS. 13a, 13b, and 13c are embodiments of the present invention; FIG. 14 is a diagram showing an example of timing control in different timing control modes of operation according to an embodiment of the present invention; FIG.

 15 is a flowchart of implementing a timing control method for a heterogeneous network in an initial timing control working mode according to an embodiment of the present invention;

FIG. 16 is a diagram of a heterogeneous network in a periodic timing control working mode according to an embodiment of the present invention. Flow chart of implementation of time control method;

 17 is a flowchart of implementing a timing control method of a heterogeneous network in an event-triggered timing control working mode according to an embodiment of the present invention;

 FIG. 18 is a structural block diagram of an access point according to an embodiment of the present invention;

 19 to 22 are block diagrams showing the structure of the timing reference AP determining unit of FIG. 18 according to an embodiment of the present invention;

 20 to 30 are block diagrams showing the structure of the timing adjustment unit of Fig. 18 provided by the embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It is understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

 In order to facilitate the clear description of the present invention, several technical terms related to the embodiments of the present invention are first described herein:

The uplink correction amount and the downlink correction amount Δ are all parameters related to the target AP. For different target APs, the values of the uplink correction amount may be the same or different, and the values of the downlink correction amount may be the same or different. It should be noted that the values of the two may be positive, negative, or zero. The method for selecting the uplink correction amount ^fi and the downlink correction amount includes: Method 1:

According to the network plan, the radius of the target service area is determined, and then the target correction amount and the downlink correction amount A ^Si are set according to the radius of the target service area, as follows:

Where r is the uplink or downlink coverage radius of the target coverage area determined by the network plan, and Ω is a parameter adjusted according to the actual network scenario and other factors, and is the speed of light. Method Two:

 The estimation is performed according to the uplink transmission timing advance TA of the user served by the target AP, and the target AP served as the target AP maintains a transmission delay Dsls ^ between each user for the user. Parameters that are adjusted based on actual network scenarios and other factors.

 System information of the cell: The system information includes but is not limited to the transmit power of the reference signal used for path loss estimation, the coverage size information of the cell, and the like.

 FIG. 4 is a flowchart showing an implementation process of a timing control method for a heterogeneous network according to an embodiment of the present invention, which is described in detail as follows:

 S 1 01 , determining a timing reference AP of the target AP in the heterogeneous network, where the target AP is an AP that needs to be timed in the heterogeneous network.

 In this embodiment, when a target AP is added to the heterogeneous network, the target AP is determined to provide a timing reference AP for the reference timing. The determining the timing reference AP of the target AP in the heterogeneous network includes: according to at least one of a coverage size of the searched AP, a transmit power, and a received power of a signal that the target AP receives the searched AP, or according to the searched Whether the AP has information of the target AP to determine a timing reference AP of the target AP.

 The specific manner of determining the timing reference AP of the target AP in the heterogeneous network includes but is not limited to the following:

 The first way to configure the console is as follows:

The timing reference AP of the target AP is determined according to the configuration information of the console. In this embodiment, when the timing reference AP is configured for the target AP through the console, the coverage size of the AP that can be searched by the target AP, the transmit power, and the received power of the signal that the target AP receives the searched AP are at least Whether the AP that the root target AP can search has the information of the target AP to select a timing reference AP for the target AP. The manner in which the console configures the timing basic AP may refer to the corresponding description in the embodiment of the following target AP determining the timing reference AP. Understandably, The specific manner in which the console determines the timing reference AP of the target AP in the heterogeneous network may also include other multiple manners. This embodiment does not—for example.

 The second mode is the listening and estimating mode, that is, the target AP searches for the surrounding AP, and estimates the timing reference AP corresponding to the target AP. The specific process is as follows:

1. The target AP searches for the AP on the specified spectrum resource, and sets the searched AP set to (Αί, 1

The number of APs that are searched by the target AP, N ≥ i; where the specified resource spectrum is the working spectrum specified for the target AP when the target AP provides services for users in the heterogeneous network.

2. The target AP reads the system information of each searched, obtains the transmit power of the reference signal estimated by the AP _S for the path loss (Path Loss) from the system information, and obtains the transmit power set i3⁄4 _s , i = i , 2,..., and measure the received power of each reference signal to obtain a received power set {RSRP^i = i, ''N};

3. The target AP estimates the AP to which the target AP belongs according to the transmit power set (^ = ₁ ... N) and the received power set (RSRiVJ = >'". N}, and determines the AP to which the target AP belongs as the timing reference of the target AP. AP. The specific steps are as follows:

A. The received power of the reference signals of all searched APs {RSS.3⁄4, i = l, 2 ' is sorted from large to small, ie { SR3⁄4 _{fex(3⁄4v .k} - 1,2,"".3⁄43⁄4ΰ 'δ.χ(&) e 1,2,-"13⁄4?]1 , where

B. Sort the transmission power of all searched APs {3⁄4 = 1, 2, 13⁄4 from large to small, and obtain the maximum value.

 C, set Ki = i;

D. If the following conditions are met:

<¾ _{a: K, E} € the〗 i ^ _e3 corresponding to the target AP is the AP of the timing reference AP, otherwise, the m = m + i, returns to step D. Where Δ is a predefined threshold.

It can be understood that the timing reference AP can be determined by using the transmit power and the received power in other manners, which is not limited in this embodiment. The third mode is the mode of listening and AP information interaction, that is, the target AP searches for the surrounding AP, and establishes a connection with the searched AP, and determines the target reference AP of the target AP by interacting with the information of the searched AP. Specific steps are as follows:

 1. The target AP searches for the AP on the specified spectrum resource, and sets the searched AP set to ίΜ' = l where N is the number of APs searched by the target AP, N>I;

 2. For each cell in the cell collection {Αί3⁄4, = ί ..., the target ΑΡ performs the following operations:

 Α, set ί = ΐ;

 Β, target AP and establish a connection;

 C. The target AP interacts with the information. If the AP3⁄4 side has information about the target AP (such as the ID identifier of the target )), the A3 is determined as the timing reference AP of the target AP, otherwise, i = i ÷ l is set. After that, return to step B. The fourth method is the interception and coverage information interaction mode, that is, the target AP searches for the surrounding AP, reads the system information of the searched AP, and determines the timing reference AP of the target AP according to the system information of the AP. The specific steps are as follows:

 1. The target AP searches for the AP on the specified spectrum resource, and sets the searched AP set to (AB, 1 = 1, 2, -, where N is the number of APs searched by the target AP, N 1 ;

 2. The target AP reads the system information of each AP that is searched, and obtains the coverage size information of each AP from the system information. The coverage size information may be represented by L (representing a larger coverage area), M (a medium coverage area), and S (representing a smaller coverage area). Of course, the coverage size information may also be presented in other manners, and is not limited herein. The coverage size information of the AP may be a value obtained by quantizing the transmit power of the AP. Specifically, the coverage area is larger than the coverage area, the coverage area is medium, and the coverage area is smaller. The transmission power of each AP in the heterogeneous network is determined by comprehensive comparison, which is not here--illustration;

3. The target AP measures the reference signal used for path loss estimation of each AP that is searched, and estimates the received power RSRP _{S of} the reference signal;

4. The coverage size information of each AP is selected from the searched APs. Several APs form an AP subset (U _e3ffi ,, = . ί, 2 , 'Μ, Μ ≤ Ν}. The example is as follows: Sort the ΑΡ in the searched ΑΡ collection according to the coverage size information, and the coverage size The largest one or more ΑΡ of the information forms a corresponding subset of ,, such as when the coverage size is at most L, and if the coverage size is more than one of L, all ΑΡ whose coverage size is L is formed into a corresponding ΑΡ subset.

 5, ΑΡ subset { , = ί "' Μ, Μ ≤ the receiving power SRg size of each AP, the AP subset ίΑ @, = H, ≤ i ¥" the largest value of the AP identified as the target AP Timing benchmark AP.

 It is to be understood that the timing reference AP may be determined by using the coverage size information and the received power in other manners, which is not limited in this embodiment. In another embodiment of the present invention, searching for an AP around the target AP determines the target according to at least one of a coverage size of the searched AP, a transmit power, and a received power of a signal that the target AP receives the searched AP. The timing reference AP of the AP includes:

The target AP searches for the AP on the specified spectrum resource, and sets the searched AP set to ( , i=t _t z-Nj, where N is the number of APs searched by the target AP, N≥i;

The target AP reads system information of each searched, and obtains, from the system information, the transmit power of each A3⁄4 reference signal used for path loss estimation, to obtain a transmit power set 3⁄4, 1 = 1, 2 Or measuring the received power of each reference signal to obtain a received power set (RSR^.i = or obtaining coverage size information of each AP from the system information; the target AP will transmit the power The 对应 corresponding to the maximum value of the set [3⁄4^=: ί ... is set to the timing reference 所述 of the target ΑΡ, or the target ΑΡ sets the maximum value of the received power set (RSRiVJ::^^^} The corresponding AP is set as the timing reference AP of the target AP, or the target AP sets the AP corresponding to the maximum value in the coverage size information to the timing reference AP of the target AP. When there are multiple maximum values of :^ 2:! ..., one of the maximum values is arbitrarily selected. When there are multiple values in the received power set {RSRP _s , i = 1., 2, N) When, one of the maximum values is arbitrarily selected. When there are a plurality of maximum values in the information, one of the maximum values is arbitrarily selected. In the embodiment of the present invention, the target AP determines the timing reference AP of the target AP by using at least one of a coverage size of the searched AP, a transmit power, and a received power of the target AP receiving the searched AP. An appropriate AP can be determined as the timing reference AP of the target AP, for example, an AP with a larger coverage area can be determined as the timing reference AP of the target AP, and the timing provided by the AP based on the timing with a larger coverage area can be determined. The benchmark adjusts the uplink and downlink timings of the APs with smaller coverage areas, thereby achieving synchronization of downlink signals of multiple APs on the user side, and receiving uplink signal synchronization of users with different APs from geographical locations on the AP side.

 S 1 02 , the target AP adjusts the uplink receiving timing and/or the downlink transmitting timing by using the timing reference AP as a timing reference.

The manner in which the target AP uses the timing reference AP as the timing reference to adjust the uplink receiving timing and/or the downlink transmission timing includes but is not limited to the following manners. For convenience of description, in the following description, the timing reference AP is assumed to be The AP target AP is AP ₂ , ? For a service AP of 13⁄4, AP ₂ is a serving AP of UE ₂ .

 The first method is the target AP downlink synchronization timing reference AP, as shown in Figure 5a, and the specific steps are as follows:

 1. The target AP synchronizes with the downlink signal of the timing reference AP, and obtains the downlink receiving timing of the downlink signal of the timing reference AP at the target AP;

 1. 2. Use the downlink correction amount of the target AP to adjust the obtained downlink reception timing, and determine the adjusted downlink reception timing as the downlink transmission timing of the target downlink signal.

 For ease of understanding, please refer to Figure 5b. The following is a detailed description of the above.

1) The target AP synchronizes with the downlink signal of the timing reference AP. At this time, the downlink reception timing of the target AP side (ie, the AP ₂ side) (shown as (2) in FIG. 5b) is a timing reference AP (ie, APJ's). downlink transmission timing (FIG. 5b (1)) for some offset which is represented by la _gl, la _gl AP to the timing reference propagation delay target AP, Figure 5b (2) of the Indicates: 3⁄4^^ = 3⁄4-^3⁄4, where _s ^c _s is the downlink reception timing of the downlink AP of the timing reference AP at the target AP, T. The downlink transmission timing of the timing reference AP;

 2) using the downlink correction amount to adjust the downlink transmission signal of the obtained timing reference AP in the downlink reception timing of the target AP, and determine the adjusted downlink reception timing as the downlink transmission timing of the target AP to be used finally, as shown in FIG. 5b ( 3) shown: where 3⁄4 is the adjusted downlink transmission timing;

3) Applying the downlink transmission timing to the downlink signal of the user 13⁄4 (such as UE ₂ ) served by the target AP, as shown in FIG. 5b (4), the downlink reception timing of the user UE side is as shown in FIG. 5b (5).

 The second method is that the target AP uplinks the synchronization timing reference AP, and the timing reference AP feeds back to the target AP, as shown in Figure 6a. The specific steps are as follows:

 2.1. The target AP sends an uplink synchronization signal to the timing reference AP for uplink synchronization, and the target AP acquires the uplink transmission timing of the timing reference AP synchronization according to the feedback of the timing reference AP;

 2.2. Using the uplink correction amount of the target AP, adjusting the obtained uplink transmission timing, and determining the adjusted uplink transmission timing as the uplink reception timing of the target AP uplink signal;

 2.3. According to the uplink receiving timing of the target AP, the transmission delay between the target AP and the user it serves determines the uplink transmission timing of the user.

 For ease of understanding, please refer to Figure 6b. The following is a detailed description of the above.

 1) The target AP is synchronized with the timing reference AP downlink signal, as shown in Figure 6b (2);

2) transmit to the target AP AP uplink synchronization timing of the reference signal, uplink synchronization with the timing reference AP, in the synchronous state, the target AP uplink transmission timing _i ¾s _ _{ti. £} shown in Figure 6b (3), i.e., ^ ec Asar&iii = schs^k - ^{ί Ί} ÷. ' e:t) , due to

3⁄4 _£ «,^ = 3⁄4÷ So.^^τ^ = - 0 et, where C Ssi: is the offset between the uplink reception timing and the downlink transmission timing of the AP on the timing reference, and the value of Sr^ Of^t is The target AP is obtained from the feedback information of the timing reference AP;

3) Adjust the uplink receiving timing of the target AP side by using the uplink correction amount, that is, = w + , the target AP adopts the adjusted _e .^^^ as the uplink receiving timing of the target AP;

 4) For all users whose service AP is the target AP, the downlink reception timing is shown in Figure 6b (5), where is the propagation delay of the target AP to the user, and the uplink transmission timing of the target AP is 1 , among them:

3⁄4 = + ^L — = 3⁄4 - - e3⁄4 + - lag,

 5) The uplink reception timing of the target AP in the synchronized state with the target AP is as shown in Fig. 6b (7).

 The third method is to measure the timing adjustment of the downlink measurement of the user of the timing reference AP and feed it back to the target AP, as shown in Figures 7a and 7b. The specific steps are as follows:

 The timing reference AP obtains the user set i=i, 2, ~U, and the service AP of the user in the user set is the timing reference AP and the user in the user set is close to the target AP, where L is the total number of the users. In the embodiment of the present invention, the method of reporting the timed reference AP by using the A3 event is used to determine whether the user is close to the target AP. The specific process belongs to the prior art, and is not described herein.

3.1. The user in the user set performs downlink synchronization with the timing reference AP to obtain the downlink reception timing from the timing reference AP (as shown in (2) in FIG. ⁷ b );

3.2, and the target AP ^ users in the user set of downlink synchronization, obtain the downlink reception timing from the target AP (FIG. ⁷ b in (1));

 3.3. The user in the user set uses the obtained two downlink receiving timings to estimate the timing difference between the two, and feeds the timing difference to the timing reference AP.

 3.4. Timing reference The AP estimates the timing adjustment amount required by the target AP by using the downlink reception timing difference fed back by the user in the user set;

 3.5. The target AP obtains the required timing adjustment amount by interacting with the information between the timing reference APs;

3.6. The target AP performs uplink receiving timing and/or downlink transmission by using the obtained timing adjustment amount. Timing adjustments.

 The step of adjusting the uplink receiving timing and/or the downlink transmitting timing by using the obtained timing adjustment amount by the target AP is specifically as follows:

 The downlink transmission timing of the target AP is delayed, and the delay time is the timing adjustment amount; the uplink reception timing of the target AP is advanced, and the advance time is the timing adjustment amount.

 The fourth method is to measure the timing adjustment of the downlink measurement of the target AP and feed it back to the target.

AP, as shown in Figure 8a, 8b, the specific steps are as follows:

Set all or part of the user set served by the target AP to be _&i , i = i, 2,, '. L), where L is the total number of users.

4.1, a user in the user set with the timing reference AP ^ for downlink synchronization, the timing of acquiring the downlink from the AP reception timing reference (FIG. ⁸ b in (2));

 4. The user in the user set and the target AP perform downlink synchronization to obtain the downlink reception timing from the target AP (as shown in (1) in Figure 8b);

 4. The user in the user set uses the obtained two downlink receiving timings to estimate the timing difference between the two, and feeds the timing difference to the target AP.

 4. The target AP estimates the transmit timing adjustment required by the target AP by using the downlink reception timing difference fed back by the user in the user set;

 4. The target AP uses the obtained transmission timing adjustment amount to adjust the uplink reception timing and/or the downlink transmission timing.

 The step of the target AP adjusting the uplink receiving timing and/or the downlink transmitting timing by using the obtained transmission timing adjustment amount is specifically:

 The downlink transmission timing of the target AP is delayed, and the delay time is the timing adjustment amount; the uplink reception timing of the target AP is advanced, and the advance time is the timing adjustment amount.

 The fifth method is that the timing reference AP estimates the timing adjustment amount according to the transmission delay of the user served by the user, and feeds back to the target AP, as shown in FIG. 9a, and the specific steps are as follows:

The timing reference AP obtains the user set ^ = 1, 2, ', the service of the user in the user set The AP is a timing reference AP and the users in the user set are close to the target AP, where L is the total number of users.

 5. The timing reference AP estimates the transmission delay between the timing reference AP and the user it serves by the Timing Advance (TA) of the user it serves.

 5. The timing reference AP estimates the downlink transmission timing of the target AP by using its own downlink transmission timing and the transmission delay of the user in the user set;

 5. The target AP obtains the downlink transmission timing estimated by the timing reference AP by interacting with the information of the timing reference AP;

 5. The target AP uses the downlink transmission timing and the currently used downlink transmission timing to estimate the timing adjustment amount;

 5. 5. The target AP uses the obtained timing adjustment to adjust its downlink transmission timing and/or uplink reception timing.

 The step of adjusting the uplink receiving timing and/or the downlink transmitting timing by using the obtained timing adjustment amount by the target AP is specifically as follows:

 The downlink transmission timing of the target AP is delayed, and the delay time is the timing adjustment amount; the uplink reception timing of the target AP is advanced, and the advance time is the timing adjustment amount.

 For ease of understanding, please refer to Figure 9b. The following is a detailed description of the above.

 The target AP interacts with the timing reference AP cell to obtain the downlink transmission timing of the target AP side, where the service AP is a timing reference AP;

 1) Timing Reference The AP has its own downlink transmission timing τ. , as shown in Figure 9b (l);

 2) Timing reference AP estimation target AP side downlink transmission timing relative to the timing reference AP timing offset, the implementation method can be:

a) The timing reference AP obtains a set of users [£3⁄4 = 1.2, ... L}, the service AP of the user in the user set is a timing reference AP and the users in the user set are close to the target AP, where L is the total number of users ; b) The timing reference AP is advanced according to the acquired user set [ί1⁄2μ= i, 2, ~ L)

13⁄4 Estimate the user's downlink delay I _syi , as shown in 9b (2), where ΤΑ _; is the offset between the uplink transmission timing and the downlink reception timing on the user side, as shown in Figure 9b (3)

 - o t

 laVi = ——

 The Οϋ3⁄4ί is the offset between the timing reference ΑΡ side uplink reception timing and the downlink transmission timing. c) timing reference 下行 set of downlink delays according to the set of acquired users ^ = ί ...

{ ei , = m] Estimate the initial offset A of the downlink transmission timing of the target AP side with respect to the downlink transmission timing of the timing reference AP side. _Ffisuli , optional estimation methods include:

4. _:

 Or 1⁄23⁄4 = ( 13⁄4^ = ί ... U)

^ A _03⁄4 - _set , _d ! = sis sx({De!a _E , 1 = 1,2;.... L), d) The target AP interacts with the timing reference AP to obtain the downlink transmission timing estimated by the timing reference AP. Offset Tfe^nfcs;

3) The target AP estimates the final downlink transmission timing by using the acquired downlink transmission timing information ^^.^ and the downlink correction amount ^L configured by itself;

 _ sDL

4) comparing with the downlink transmission timing currently used by the target AP to determine the timing adjustment amount;

 5) The target AP performs adjustment of its downlink transmission timing and/or uplink reception timing by using the obtained timing adjustment amount;

 The sixth method is that the timing reference AP estimates the uplink receiving timing in advance and feeds back to the target AP according to the uplink timing of the user served by itself, as shown in FIG. 10a, and the specific steps are as follows:

The timing reference AP acquires a user set 1⁄4J.= i, 2., L , the service AP of the user in the user set is a timing reference AP and the user in the user set is close to the target AP, where L is the total number of the users; 6. The timing reference AP estimates the uplink reception timing of the target 利用 by using the uplink transmission timing of the user in the user set in advance.

 6. 2. Objectives 获取 Obtain the uplink reception timing estimated by the timing reference ΑΡ through information interaction;

 6. 3. Target ΑΡ Estimate the timing adjustment amount by using the uplink reception timing obtained by the timing reference 与 and the currently used uplink reception timing;

 6. 4. Target ΑΡ Adjust the uplink reception timing and/or downlink transmission timing using the obtained timing adjustment amount.

 The steps of the target ΑΡ adjusting the uplink receiving timing and/or the downlink transmitting timing by using the obtained timing adjustment amount are specifically as follows:

 The downlink transmission timing of the delay target ,, the delay time is the timing adjustment amount; the uplink reception timing of the advance target ΑΡ, the advance time is the timing adjustment amount.

 For ease of understanding, please refer to Figure 10b. The following is a detailed description of the above.

 The target AP interacts with the timing reference AP to obtain the uplink receiving timing of the target AP.

As shown in FIG. 10b, in the figure, the UEj service AP is the target AP, that is, the AP ₂ , the service AP of the AP is the timing reference AP, that is, the AP. The specific steps are as follows:

 1) Timing reference The AP has its own downlink transmission timing information T. ;

 2) Timing reference The AP estimates the uplink receiving timing of the target AP, which can be implemented as follows: a) The timing reference AP obtains the set of users close to the target AP among the users it serves.

03⁄4μ = 1 ... L , L is the total number of users;

b) the timing reference AP acquires the uplink transmission timing advance of the user set =: L); C) the timing reference AP advances according to the uplink transmission timing of the user set {13⁄4Ί = ί ... L) and its own downlink transmission The estimated uplink timing of the target should be estimated periodically. The alternative is: Which about 03⁄4,! = 1.2, '» U's function / ) can be of the form: ίίΐΊΑ, A = ί,2 LB = ( ', .i = i,.2,~ L]),

Or 扉 = 12.^1» = ₌ 1, ₂ ,, ).

 3) Target AP and timing reference The AP obtains the timing reference through the information exchange. The estimated uplink reception timing of the AP.

4) The target AP estimates the uplink reception timing used by the user UEj served by the UE according to the uplink reception timing _£ ^ _£ ^ obtained in step 3) and its configured uplink correction amount, as follows:

^ ₅ ÷^-3⁄4, where is the uplink reception timing of the user UEj, which is the delay of the target AP to the user UEj;

 5) Comparing ^^^÷^ with the current receiving timing currently used by the target AP, determining the timing adjustment amount, and adjusting the uplink receiving timing and/or the downlink transmitting timing by using the obtained timing adjustment amount.

 The seventh method is that the timing reference AP measures the estimated timing adjustment amount and feeds back to the target AP, as shown in Figure 11a, lib. The specific steps are as follows:

 Set all or part of the user set served by the target AP to be ^ = t.2, -L}, where L is the total number of users.

 7.1. Timing Reference The AP obtains parameter configuration information of the uplink physical signal (such as random access signal, SRS or RS, etc.) of the user ^ in the user set;

 7.2. Timing Reference The AP estimates the uplink receiving timing by receiving an uplink physical signal that detects the user.

 7.3. Timing reference The AP estimates the timing adjustment amount of the target AP by comparing the receiving timing of the user set with the receiving timing of the user served by the user;

7.4. The target AP acquires the timing adjustment amount estimated by the timing reference AP by using information interaction with the timing reference AP. 7. The target AP uses the obtained timing adjustment amount to adjust the uplink reception timing and/or the downlink transmission timing.

 The step of adjusting the uplink receiving timing and/or the downlink transmitting timing by using the obtained timing adjustment amount by the target AP is specifically as follows:

 The downlink transmission timing of the target AP is delayed, and the delay time is the timing adjustment amount; the uplink reception timing of the target AP is advanced, and the advance time is the timing adjustment amount.

 The eighth method is to measure the estimated timing adjustment of the target AP, as shown in Figure 12a, and the specific steps are as follows:

The timing reference AP acquires the user set 03⁄4 _s j = i,.m The service AP of the user in the user set is a timing reference AP and the user in the user set is close to the target AP, where L is the total number of the users;

 8. The target AP obtains parameter configuration information of the uplink physical signal (such as random access signal, SRS or RS) of the user & in the user set;

 8. The target AP estimates the uplink receiving timing of the user set by receiving an uplink physical signal of the user.

 8. 3. Target 估计 Estimate the timing adjustment of the target ΑΡ by comparing the uplink reception timing of the user set with the uplink reception timing of the user served by itself;

 8. 4. Target ΑΡ Use the timing adjustment obtained to adjust the uplink reception timing and/or downlink transmission timing.

 The steps of the target ΑΡ adjusting the uplink receiving timing and/or the downlink transmitting timing by using the obtained timing adjustment amount are specifically as follows:

 The downlink transmission timing of the delay target ,, the delay time is the timing adjustment amount; the uplink reception timing of the advance target ΑΡ, the advance time is the timing adjustment amount.

 For ease of understanding, please refer to Figure 12b. The following is a detailed description of the above.

1) The timing reference AP determines the set of users in the cell that are close to the target AP [3⁄4^ = ^, ", L For the total number of users, the service AP of the user in the set is a timing reference AP;

 2) The target AP acquires configuration information of a physical reference signal such as a Sounding Reference Signal (SRS) or a Demodulation Reference Signal (DMRS) of each user in the user set, and the target AP can pass the Acquiring information between the timing reference APs to acquire the physical reference signal configuration information;

The configuration information SRS, Videos and other physical reference signal RS 3) target AP detected using the acquired user set the user uplink signal arrival time to reach the target AP Ar v _S mm _e: (i.e., the user 5 in the upstream of the target AP Receiving timing), as shown in Figure 12b (4);

 4) The target AP uses the acquired arrival time = ί ... U and its configured uplink correction amount to measure the uplink transmission timing of the user's service 13⁄4; optional practice can be:

 T ~ ^bei i^ark.-Lii + "-

Where = i(iArr 3⁄4n3⁄4^i = 1 _s - U)

Alternatively, the function /(.) on r∑ia!13⁄4^i= i,2,..,i} may be in the form

 Or

= 1,2,"- L}) =

=; L.2, '-'L

 Or

 = !..2,'·· L})

5)

The uplink reception timings used are compared, the timing adjustment amount is determined, and the adjustment of the uplink reception timing and/or the downlink transmission timing is performed by using the obtained timing adjustment amount.

 The ninth mode is that the target AP and the timing reference AP perform timing adjustment according to the uplink receiving time difference of the user, as shown in FIG. 13a, and the specific steps are as follows:

Set the set of users close to the target AP as, i=u, ~L], where L is the total number of users. 9. The target AP and the timing reference AP respectively obtain parameter configuration information of the uplink physical signal (such as random access signal, SRS or pictured RS) of the user in the user set;

 9. 2 The target AP estimates the uplink reception timing of the user at the target AP according to the uplink physical signal of the user;

 9. The timing reference AP estimates the uplink receiving timing of the user at the timing reference AP according to the uplink physical signal of the user £/;

 9. Calculate the user [the uplink receiving time difference between the target AP and the user [in the uplink receiving timing of the timing reference AP 4:], so that all the users in the user set can perform the above steps. Time difference of uplink reception timing of the user set};

 9. 5, using the time difference of the uplink reception timing of the user set 3⁄4" to determine the timing adjustment amount of the target AP;

 9. Target AP uses the timing adjustment of the target AP to adjust the uplink receive timing and/or downlink transmit timing.

 The step of adjusting the uplink receiving timing and/or the downlink transmitting timing by using the timing adjustment amount of the target AP by the target AP is specifically as follows:

 The downlink transmission timing of the target AP is delayed, and the delay time is the timing adjustment amount; the uplink reception timing of the target AP is advanced, and the advance time is the timing adjustment amount.

 For ease of understanding, please refer to Fig. 1 3b and Fig. 1 3c. The above content will be described in detail below with a specific example.

 The target AP corresponds to LPN, and the timing reference AP corresponds to Macro (macro station). The downlink frame timing adjustment of the LPN is described below.

Take a certain range of A located near the LPN as an example: The time difference between the Macro and LPN arriving at UE _A is TUM-TUL. This value can be obtained by taking the time difference of the uplink signal/channel of UE _A arriving at Ma cr 0 and LPN to obtain 1 -1 . The ideal way to make the LPN and Macro arrive at UE _A is to delay the LPN frame downlink start time. For other UEs _M , the downlink start time delay value LMrl k of the relatively ideal LPN frame can also be obtained, so that the time required for the LPN to be adjusted can be obtained. The range is between the minimum and maximum values: min(LM ₁ -LM ₂ )~max(LM-LM ₂ ), M=l, 2, .... In order to be able to accommodate a certain range of UE timing adjustments near the LPN For the demand, the maximum value max (LMrl Q) of the above timing adjustment can be selected. For a certain environment, there is a certain delay spread value T _ds , which can be obtained by empirical value or measurement. Thus, "max (LM-LM ₂₎ can be obtained. ) - min (LM-LM ₂ ) + T _ds <CP" , where T _ds is the delay spread previously obtained or pre-estimated by Macro, and CP is Macro according to OFDM (Orthogonal Frequency Division Multiplexing) symbol The time value obtained by the length of the CP used.

The boundary UE covered by the LPN can be determined according to minO^-l Q, which satisfies "min(LM-LM ₂ ) > max (LM-LM ₂ ) + T _ds -CP"

 According to the above, for a UE that satisfies the range min MH O-max MH O , it can be used as a UE that is potentially accessing the LPN, and then according to the downlink signal (the following reference signal) or the uplink signal (such as the uplink reference signal). As a result, the selection of the UE affiliate node is performed.

 The process of LPN downlink frame timing adjustment is illustrated as follows:

According to the above, UE _B and UE _C in FIG. 13b are taken as an example. Assume that UE _B is closer to Macro than UE _C is from Macro. First, UE _B and UE _C perform or maintain downlink synchronization with Macro respectively. The initial LPN frame start time is aligned with the Macro frame start time. The Macro calculates the arrival time difference from UE _B and UE _C according to Macro and LPN, respectively. As can be seen from Fig. 13b, the frame adjustment corresponding to UE _B near Macro is larger than the value of frame adjustment of UE _e far from Macro. According to the above, if the adjustment value of the LPN DL frame corresponding to the H UE _B is the calculated maximum adjustment value, the minimum value of the allowed UE to Ma cr 0 and the arrival time difference to the LPN is calculated based on the value. The minimum min MH Q needs to satisfy the min(LM-LM ₂ ) > max (LM-LM ₂ ) + T _ds _CP. In summary, according to the above description, the LPN downlink frame provided by the embodiment of the present invention can be obtained. The implementation process of timing adjustment is as shown in Figure 13c, which is detailed as follows:

 1. The UE and the Macro perform or maintain downlink synchronization;

1. The UE sends a UL RACH channel or a UL pilot signal or a UL control channel or a UL data channel; 3. Macro and LPN receive uplink channels or signals from the same UE respectively;

4. Macro compares the arrival time of the uplink channel or signal of the same UE received by Macro and LPN, and the difference is LMrl ^ , where LMi indicates the time when the UE arrives at the Macro, and LM ₂ indicates the time when the UE arrives at the LPN;

5. Macro compares LM "LM ₂ of different UEs;

6. Macro takes the maximum value of the comparison result or the minimum value above a certain threshold or the maximum value below a certain threshold as max ( LM - LM ₂ );

7. Macro calculates the difference between the time when the UE arrives at the Macro and reaches the LPN time. LMi-l ^ needs to meet the minimum value min (LM - LM ₂ ) = max (LM - LM ₂ ) + T _ds _CP.

 In this embodiment, the uplink and downlink timings of the APs with smaller coverage areas are adjusted based on the AP timing with a larger coverage area, thereby achieving synchronization of downlink signals of multiple APs on the user side, and receiving the downlink signals from the AP side. The uplink signals of users with different service APs with similar geographical locations are synchronized, so that the performance of the related physical channels such as the primary synchronization channel and the secondary synchronization channel in the heterogeneous network can be improved, and the enhancement technology such as CoMP can be realized.

 In the embodiment of the present invention, one of the nine timing control modes may be selected according to different scenarios of the heterogeneous network to adjust the uplink receiving timing and the downlink transmitting timing of the target AP, and of course, uplink receiving of the target AP. When the timing and downlink transmission timing are adjusted, the selected timing control modes may be the same or different. Among the above nine timing control modes, the first mode is only used for downlink timing control, and the second mode is used for uplink timing control only. Other control modes can be used to adjust the uplink reception timing and downlink transmission timing of the target AP.

 In the embodiment of the present invention, according to the timing control working mode, the timing control method of the heterogeneous network may be divided into initial timing control, periodic timing control, and event triggered timing control, as shown in FIG. 14 when in a heterogeneous network. When the new AP is added to the target AP, the timing control method of the heterogeneous network is as follows:

First, the initial timing control working mode is entered, that is, the target AP that is added to the heterogeneous network is powered on. In the target AP initialization process, the timing reference AP is determined for the target AP, and the target AP is The timing reference AP is a timing reference, and the preset timing control mode is used to adjust the uplink receiving timing and/or the downlink transmitting timing.

 After the initial timing is completed, that is, after the target AP is powered on and initialized, according to the set clock cycle, in the clock cycle, the target AP uses the downlink timing and the uplink receiving timing after the initial timing to communicate with the served user. When the clock expires, the target AP adopts the timing reference AP as the timing reference, and uses the preset timing control mode to adjust the uplink receiving timing and/or the downlink transmitting timing. After the timing control is completed, the target AP adopts the updated downlink transmitting timing. Communicate with the user it serves with the uplink reception timing.

 After the initial timing is completed, continuously detecting whether a trigger event for triggering the timing control occurs, and when detecting that a trigger event for triggering the timing control occurs, entering an event-triggered timing control working mode, that is, the target AP timing reference AP is timing. The reference uses the preset timing control mode to adjust the uplink receiving timing and/or the downlink transmitting timing, and after the event-triggered timing is completed, the target AP adopts the event-triggered timing downlink downlink timing and uplink receiving timing and services thereof. The user communicates and re-enters the periodic timing control mode of operation. The periods in the periodic timing control working mode before and after the event trigger may be the same or different.

 The timing control method in each timing control operation mode will be described in detail below.

 Timing control method in initial timing control mode:

 FIG. 15 is a flowchart showing an implementation process of an initial timing control method for a heterogeneous network according to an embodiment of the present invention, which is described in detail as follows:

 5201. Power on the target AP that is added to the heterogeneous network.

 5202. During the target AP initialization process, determine a timing reference AP for the target AP, and the target AP uses the timing reference AP as a timing reference to perform uplink receiving timing and/or downlink transmission timing adjustment.

 In this embodiment, the uplink receiving timing and/or the downlink transmitting timing of the target AP newly added to the heterogeneous network and not initialized may be adjusted.

 Timing control method in periodic timing control mode:

FIG. 16 shows a periodic timing control method for a heterogeneous network according to another embodiment of the present invention. The implementation process of the method is the timing maintenance of the synchronous mode of the same-frequency air interface, which is as follows:

 5301. After the target AP is powered on and initialized, according to the set clock cycle, the target AP uses the current downlink transmission timing and the uplink reception timing to communicate with the served user in the clock cycle.

 5302. According to the set clock period, when the clock times out, the target AP uses the timing reference AP as a timing reference to adjust the uplink receiving timing and/or the downlink transmitting timing.

 In this embodiment, after the target AP has been powered on and initialized, the timing deviation of the target AP can be maintained.

 Timing control method in event triggered timing control mode:

 FIG. 17 is a flowchart showing an implementation process of an event-triggered timing control method for a heterogeneous network according to another embodiment of the present invention, which is described in detail as follows:

 5401. Detect whether a trigger event for triggering timing control occurs.

 The triggering events for triggering the timing control include, but are not limited to, the transmission power change of the target AP and the timing reference AP, the radio frequency parameter change and the like, the events affecting the target AP and the timing reference AP coverage area, and the periodic change of the periodic timing control, etc. Periodically control events that change operating parameters.

 5402. When detecting that a trigger event for triggering the timing control occurs, determining whether the timing reference AP needs to be re-determined according to the current event. If the current event is an event that affects the timing reference AP coverage area, such as a change in the transmit power of the timing reference AP, the target AP re-determines the timing reference AP and performs adjustment of the uplink reception timing and/or the downlink transmission timing; otherwise, the original timing reference is used. The timing of the AP is adjusted based on the uplink reception timing and/or the downlink transmission timing.

Through the event-triggered timing control mode, the re-acquisition of the timing deviation between the target AP and the timing reference AP in the case of a major change in the system parameters such as the AP transmit power and a change in the configuration of the periodic timing control operating parameters is achieved. In the embodiment of the present invention, according to whether the information interaction manner between the target AP and the timing reference AP and the timing control manner affect the target AP and its service user Inter-communication can be divided into:

 method one:

 The target AP performs timing information interaction with the timing reference AP on a certain spectrum resource by using a wireless connection, and the spectrum resource used by the wireless connection is the same as the spectrum resource used for communication between the target AP and the user it serves; Or the target AP needs to receive the downlink signal from the timing reference AP on the spectrum resource or the target AP needs to uplink the signal to the timing reference AP on the spectrum resource;

 This mode has a certain influence on the communication between the target and the user, that is, in the initial timing control time, the periodic timing control time, and the event-triggered timing control time, the target AP performs configuration or stops by using the user served by the target. The user is scheduled such that the user interrupts uplink and/or downlink communication with the target AP during the time period for timing control.

 Method 2:

 The connection between the target AP and the timing reference AP may be a wireless connection mode outside the inter-band, that is, the spectrum resource used for the interaction timing information between the target AP and the user is different from the spectrum resource used for communication between the target AP and the timing reference AP. Or the connection between the target AP and the timing reference AP may be a wired connection.

 In this mode, the target AP can perform timing control without interrupting communication with the user it serves. As shown in Figure 14, the user is still able to communicate with their serving AP (i.e., the target AP) during the periodic timing control time and event triggered timing control time.

 Another embodiment of the present invention further provides a timing control method for a heterogeneous network on a timing reference AP side, where the method includes:

The timing reference AP provides a timing reference for the target AP, so that the target AP adjusts the uplink receiving timing and/or the downlink transmitting timing by using the timing reference AP as a timing reference, where the timing reference AP is And determining, by the target AP, an AP that is a timing reference of the target AP according to at least one of a coverage size of the searched AP, a transmit power, and a received power of a signal that the target AP receives the searched AP, or The target AP is based on the searched Whether the AP has the AP as the timing reference of the target AP determined by the information of the target AP, and the target AP is an AP that needs to be timed in the heterogeneous network.

 It will be understood by those skilled in the art that all or part of the steps of the foregoing embodiments may be implemented by a program to instruct related hardware, and the program may be stored in a computer readable storage medium. Storage media, such as ROM/RAM, disk, CD, etc.

 FIG. 18 shows the structure of an access point according to an embodiment of the present invention. For the convenience of description, only parts related to the embodiment of the present invention are shown.

 The access point is a target AP that needs to be timed in a heterogeneous network, and includes a timing reference AP determining unit 1 and a timing adjusting unit 2. among them:

 The timing reference AP determining unit 1 determines the timing reference AP of the target AP. The timing reference AP of the target AP includes:

 Determining a timing reference AP of the target AP according to at least one of a coverage size of the searched AP, a transmit power, and a received power of a signal that the target AP receives the searched AP, or according to whether the searched AP has a The information of the target AP determines the timing reference AP of the target AP.

 The timing adjustment unit 1 adjusts the uplink reception timing and/or the downlink transmission timing of the target AP by using the timing reference AP as a timing reference.

 In another embodiment of the present invention, the timing reference AP determining unit 1 includes a timing reference AP configuration module 1 1 1 . The timing reference AP configuration module 1 1 1 determines the timing reference AP of the target AP according to the configuration information of the console. Wherein the console determines the timing reference AP of the target AP according to at least one of a coverage size of the AP that the target AP can search for, a transmission power, and a received power of a signal that the target AP receives the searchable AP, or according to the target. Whether the information of the target AP is included in the AP searchable AP determines the timing reference AP of the target AP.

In another embodiment of the present invention, referring to FIG. 19, the timing reference AP determining unit 1 includes a first AP search module 121, a first power acquiring module 122, and a first timing reference AP determining module 123. among them: The first AP search module 121 causes the target AP to search for the AP on the specified spectrum resource, and sets the searched AP set to [Α, ί = ί, 2, "'Ν", where Ν is the AP searched by the target AP. number, N≥l ₀ a first power acquisition module 122 reads the system information for each searched acquires the system information from each of the transmit power .4 a reference signal path loss estimate to obtain emission The power set [3⁄4^ί = ΐ, 2^^, and the received power of each reference signal is measured to obtain the received power set 3⁄4SRE3⁄4, i = 1H.

 a first timing reference AP determining module 123 root according to the set of transmit power

{3⁄4 _s> i = ί2, - Ν) and the >> history power set (HSSi^i = 1, 2, estimate the AP to which the target AP belongs, and determine the AP to which the target AP belongs as The timing reference AP of the target AP, wherein the timing reference AP determining module 123 estimates the target AP belongs according to the transmit power set (3⁄4^1 = 1 〜N) and the received power set " _S > ϊ _{= 1} ^... The specific process of the AP and the AP to which the target AP belongs is determined as the timing reference AP of the target AP is as described above, and details are not described herein again.

 In another embodiment of the present invention, referring to FIG. 20, the timing reference AP determining unit 1 includes a second AP search module 131, a connection establishing module 132, and a second timing reference AP determining module 133. among them:

 The second AP search module 131 causes the target AP to search for the AP on the specified spectrum resource, and sets the searched AP set to { i, ΐ=ί ... 3⁄4, where N is the number of APs searched by the target AP, N ≥i.

 The connection establishment module 132 establishes a connection between the target AP and each of the searched APs and performs information interaction.

 The second timing reference AP determining module 133 determines, according to the information exchange with the connection establishing module 132, the AP having the information of the target AP in the searched AP as the timing reference AP of the target AP.

In another embodiment of the present invention, referring to FIG. 21, the timing reference AP determining unit 1 includes a third AP search module 141, a cell coverage information processing module 142, a second power acquisition module 143, and a third timing reference AP determining module. 144. among them: The third AP search module 141 causes the target AP to search for the AP on the specified spectrum resource, and sets the searched AP set to [Α, ί = ί, 2, "'Ν", where Ν is the AP searched by the target AP. The number, N ≥ ₁₀ coverage information processing module 142 causes the target AP to read the system information of each AP that is searched, obtains the coverage size information of each AP from the system information, and according to the coverage of each AP The size information, selects a few APs with the largest coverage from the searched APs to form an AP subset. The second power acquisition module 143 causes the target AP to measure the reference signal used for path loss estimation of each AP that is searched, and estimates. Receive power of the reference signal RSR^

The third timing reference AP determining module 144 sets the AP subset (Α _{κ ίδ} according to the received power RS size of each AP in the AP subset [M _{e i3⁄4} ., J = 1, 2..~ :, M ≤ _l3⁄4 , The AP with the largest value of RSR3⁄4 in = i, 2, « 3⁄4M ≤ , 3⁄4'} is determined as the timing reference AP of the target AP.

 In another embodiment of the present invention, referring to FIG. 22, the timing reference AP determining unit 1 includes a fourth AP search module 151, a third power acquiring module 152, and a fourth timing reference AP determining module 153. among them:

The fourth AP search module 151 causes the target AP to search for APs on the specified spectrum resource, and sets the searched AP set to 3⁄4, i.

Where N is the number of APs searched by the target AP, Ν ≥ ·1;

The third power acquisition module 152 causes the target ΑΡ to read the system information of each of the searched, obtain the transmit power of each reference signal used for the path loss estimation from the system information, and obtain a transmit power set. i _s ,i = 12,-3⁄4;

 The fourth timing reference AP determining module 153 causes the target AP to set the AP corresponding to the maximum value of the medium transmit power set RS = 1, 2, ... as the timing reference AP of the target AP.

 In another embodiment of the present invention, referring to FIG. 18, the timing adjustment unit 2 includes a downlink reception timing acquisition module 211 and a downlink transmission timing adjustment module 212. among them:

The downlink receiving timing acquisition module 211 synchronizes the target AP with the downlink signal of the timing reference AP, and obtains the downlink receiving timing of the downlink signal of the timing reference AP at the target AP. The downlink transmission timing adjustment module 212 uses the downlink correction amount A ^{S of the} target AP to complete the downlink reception timing obtained by the downlink reception timing acquisition module 211, and determines the adjusted downlink reception timing as the downlink transmission timing of the target AP downlink signal.

 In another embodiment of the present invention, referring to FIG. 23, the timing adjustment unit 2 includes an uplink transmission timing acquisition module 221, an uplink reception timing adjustment module 222, and an uplink transmission timing determination module 223. among them:

 The uplink transmit timing acquisition module 221 causes the target AP to transmit an uplink synchronization signal to the timing reference AP for uplink synchronization, and obtains an uplink transmission timing of the target AP synchronized with the timing reference AP according to the feedback of the timing reference AP.

 The uplink receiving timing adjustment module 222 adjusts the obtained uplink transmission timing by using the uplink correction amount of the target AP, and determines the adjusted uplink transmission timing as the uplink receiving timing of the target AP uplink signal.

 The uplink transmission timing determining module 223 determines the uplink transmission timing of the user according to the uplink receiving timing of the target AP determined by the uplink receiving timing adjustment module 222 and the transmission delay between the target AP and the user it serves.

 In another embodiment of the present invention, referring to FIG. 24, the timing adjustment unit 2 includes a first information interaction module 231 and a first timing adjustment module 232. among them:

 The first information interaction module 231 is configured to acquire the timing adjustment amount of the target AP determined by the timing reference AP by using the information exchange with the timing reference AP.

 The first timing adjustment module 232 causes the target AP to perform adjustment of the uplink reception timing and/or the downlink transmission timing by using the timing adjustment amount acquired by the first information interaction module.

 The determining the timing adjustment amount of the target AP includes:

 The timing reference AP acquires a user set [ί, ,.]= ι.2, .., ·3⁄4, the service 各 of each user in the user set is a timing reference ΑΡ, and each of the user sets The user is close to the target ΑΡ , where L is the total number of users in the set of users;

The user in the user set performs downlink synchronization with the timing reference, and obtains timing from the user. Downlink reception timing of the reference AP;

 The user in the user set performs downlink synchronization with the target AP to obtain downlink receiving timing from the target AP.

 The user within the user set estimates the timing difference between the downlink reception timing from the timing reference AP and the downlink reception timing from the target AP, and feeds the timing difference to the timing reference AP;

 The timing reference AP estimates the timing adjustment amount of the target AP using the timing difference fed back by the user in the user set.

 The first timing adjustment module 232 causes the target AP to perform uplink reception timing and/or downlink transmission timing adjustment by using the obtained timing adjustment amount as follows:

 The downlink transmission timing of the target AP is delayed, and the delay time is the timing adjustment amount; the uplink reception timing of the target AP is advanced, and the advance time is the timing adjustment amount.

 In another embodiment of the present invention, referring to FIG. 25, the timing adjustment unit 2 includes a first timing adjustment amount acquisition module 241 and a second timing adjustment module 242. among them:

 The first timing adjustment amount acquisition module 241 causes the target AP to be based on the user set

The timing difference estimated by the user in { ^, Ι = i., 2, ~ L] estimates the transmission timing adjustment amount of the target AP, and the service AP of each user in the user set { μ = 1 〜 is the target AP, Where L is the total number of users;

 The second timing adjustment module 242 causes the target 进 to perform adjustment of the uplink reception timing and/or the downlink transmission timing by using the obtained transmission timing adjustment amount;

 The feedback manner of the timing difference includes:

 The user within the user set performs downlink synchronization with the timing reference , to obtain downlink receiving timing from the timing reference ;;

 The user in the user set performs downlink synchronization with the target , to obtain downlink receiving timing from the target ;;

The user within the user set estimates the downlink reception timing from the timing reference 和 and from The timing difference between the downlink reception timings of the target APs, and the timing difference is uplinked to the target AP.

 In another embodiment of the present invention, referring to FIG. 26, the timing adjustment unit 2 further includes a second information interaction module 252, a second timing adjustment amount acquisition module 252, and a third timing adjustment module 253. among them:

 The second information interaction module 251 is configured to obtain, by the information exchange between the target AP and the timing reference AP, a downlink transmission timing estimated by the target AP estimated by the timing reference AP;

 The second timing adjustment quantity acquisition module 252 causes the target AP to obtain a downlink adjustment timing according to the second information interaction module and a downlink transmission timing estimation timing adjustment currently used by the target AP;

 The third timing adjustment module 253 causes the target AP to perform adjustment of its downlink transmission timing and/or uplink reception timing by using the obtained timing adjustment amount;

 The method for estimating the downlink transmission timing of the target AP includes:

 The timing reference AP acquires a user set {[/= 1, 2, 〜£, the service AP of each user in the user set is a timing reference AP, and each user in the user set is close to the target AP, where L is the total number of users in the user set;

 The timing reference AP estimates the transmission delay between the timing reference AP and the user it serves by the uplink transmission timing of the served user.

The timing reference AP estimates the downlink transmission timing of the target AP by using its own downlink transmission timing and the transmission delay of the user in the user set.

 In another embodiment of the present invention, referring to FIG. 27, the timing adjustment unit 2 includes a third information interaction module 261, a third timing adjustment amount acquisition module 262, and a fourth timing adjustment module 263. among them:

 The third information interaction module 261 is configured to acquire the uplink receiving timing of the target AP estimated by the timing reference AP by using the information exchange with the timing reference AP;

The third timing adjustment amount obtaining module 262 causes the target AP to interact according to the third information The uplink reception timing obtained by the block and the uplink reception timing estimation timing adjustment amount currently used by the target AP;

 The fourth timing adjustment module 263 causes the target AP to perform uplink adjustment timing and/or downlink transmission timing adjustment by using the timing adjustment amount;

 The method for estimating an uplink receiving timing of the target AP includes:

 The timing reference AP acquires a user set =: L2, . , L), the service AP of each user in the user set is a timing reference AP, and each user in the user set is close to the target AP, where L is The total number of users in the user collection;

 The timing reference AP estimates the uplink reception timing of the target AP by using the uplink transmission timing advance fl3⁄4 i = i, 2, 〜 U of the user set.

 In another embodiment of the present invention, referring to FIG. 28, the timing adjustment unit 2 includes a fourth information interaction module 271 and a fifth timing adjustment module 272. among them:

 The fourth information interaction module 271 is configured to acquire, by using the information exchange with the timing reference AP, the timing adjustment amount of the target AP estimated by the timing reference AP;

 The fifth timing adjustment module 272 causes the target AP to perform uplink reception timing and/or downlink transmission timing adjustment according to the timing adjustment amount;

 The method for estimating the timing adjustment amount of the target AP includes:

 Obtaining a user set = 1, 2, ^- L}, the service AP of each user in the user set is a target AP, where L is the total number of the users;

 The timing reference AP acquires an uplink physical signal of the user in the user set; the timing reference AP estimates an uplink receiving timing by detecting an uplink physical signal of the user;

The timing reference AP compares the reception timing of the user set with the reception timing of the user served by itself, and estimates the timing adjustment amount of the target AP.

In another embodiment of the present invention, referring to FIG. 29, the timing adjustment unit 2 includes a first parameter configuration information acquisition module 281, a first uplink reception timing estimation module 282, and a fifth timing adjustment. The quantity acquisition module 283 and the sixth timing adjustment module 284. among them

The first parameter configuration information obtaining module 281 causes the target AP to acquire an uplink physical signal of the user £ in the user set Ue _t A = 1, 2, - L, the user set { _&s J = 1, 2, - L The service AP of each user L in the user is a timing reference AP, and each user in the user set is close to the target AP, where L is the total number of users in the user set;

The first uplink reception timing estimation module 282 detects the target AP via the user _¾: physical uplink signal, estimating the set of users 1 ,, L} uplink reception timing;.

 The fifth timing adjustment quantity acquisition module 283 causes the target AP to compare the uplink reception timing of the user set with the uplink reception timing of the user served by the user, and estimate the timing adjustment amount of the target AP;

The sixth timing adjustment module 284 causes the target AP to perform uplink reception timing and/or downlink transmission timing adjustment according to the timing adjustment amount.

 In another embodiment of the present invention, referring to FIG. 30, the timing adjustment unit 2 includes a second parameter configuration information acquisition module 291, a second uplink reception timing estimation module 292, a fifth information interaction module 293, and an uplink reception time difference calculation module. 294. The sixth timing adjustment amount acquisition module 295 and the seventh timing adjustment module 296. among them:

 The second parameter configuration information obtaining module 291 causes the target AP to acquire a user set.

= U, ~.L] the user's uplink physical signal, the user set is = ί ... L) User £ is the user close to the target ,, where L is the total number of users;

 The second uplink receiving timing estimation module 292 causes the target 估计 to estimate the uplink receiving timing of the user [at the target ΑΡ according to the uplink physical signal of the user ^ obtained by the second parameter configuration information acquiring module;

The fifth information interaction module 293 causes the target ΑΡ to obtain, from the timing reference ΑΡ, the uplink reception timing of the timing reference ΑΡ estimated by the user at the timing reference AP, where the user estimates the uplink reception timing of the timing reference AP The method includes: the timing reference AP acquires an uplink physical signal of a user in the user set, and the timing reference AP is configured according to the user The row physical signal estimates the user's uplink reception timing at the timing reference AP;

The uplink receiving time difference calculation module 294 causes the target AP to acquire an uplink receiving time difference Δ _Ε between the uplink receiving timing of the target ΑΡ and the uplink receiving timing of the user at the timing reference _Ε , to obtain the user set=U, , the time difference of the uplink reception timing of L}";

 The sixth timing adjustment amount acquisition module 295 causes the target AP to determine the timing adjustment amount of the target AP by using the time difference of the uplink reception timing of the user set;

 The seventh timing adjustment module 296 causes the target AP to perform adjustment of the uplink reception timing and/or the downlink transmission timing by using the timing adjustment amount of the target AP.

 It should be noted that the implementation manners and interaction processes of the various units and modules of the access point in this embodiment may also refer to the description in the corresponding method embodiments.

 Another embodiment of the present invention further provides an access point (ie, a timing reference AP) that provides a timing reference for a target AP, where the timing reference AP is configured to provide a timing reference for the target AP, so that the target AP is configured by the target AP. The timing reference AP is a timing reference, and performs adjustment of an uplink receiving timing and/or a downlink transmitting timing, where the timing reference AP is the target AP, according to the coverage size of the searched AP, the transmitting power, and the target AP receiving the search. Determining, as at least one of the received powers of the signals of the APs, an AP that is a timing reference of the target AP, or as determined by the target AP according to whether the searched AP has information of the target AP The AP of the timing reference of the target AP, where the target AP is an AP that needs to be timed in the heterogeneous network.

In the embodiment of the present invention, the uplink and downlink timings of the APs with smaller coverage areas are adjusted based on the AP timings with larger coverage areas, thereby achieving synchronization of downlink signals of multiple APs on the user side, and receiving on the AP side. The uplink signals of users with different service APs with similar geographical locations are synchronized, so that the performance of the related physical channels such as the primary synchronization channel and the secondary synchronization channel in the heterogeneous network can be improved, and the enhancement technology such as CoMP can be realized. By performing initial timing control on the target AP, it is possible to perform uplink reception timing and/or downlink transmission timing adjustment for the target AP newly added to the heterogeneous network and has not been initialized. By periodically timing the target AP, after the target AP is powered on and initialized, the timing offset of the target AP can be maintained. Through the target The AP performs event-triggered timing control to re-acquire the timing offset between the target AP and the timing reference AP in the case where the system parameters such as the AP transmit power are significantly changed and the periodic timing control operating parameter configuration changes. When the spectrum resource used for communication between the target AP and the user it serves is the same as the spectrum resource used for communication between the target AP and the timing reference AP, if the target AP needs to receive the timing reference AP from the spectrum resource. When the downlink signal or the target AP needs to uplink the signal to the timing reference AP on the spectrum resource, during the initial timing control time, the periodic timing control time, and the event-triggered timing control time, the target AP uses the The configuration made by the served user or the scheduling of the user is stopped, so that the user interrupts the uplink and/or downlink communication with the target AP during the time period for timing control. When the spectrum resource used for the interaction between the target AP and the user is different from the spectrum resource used for communication between the target AP and the timing reference AP, or when the connection between the target AP and the timing reference AP is wired, the initial timing is During the control time, during the periodic timing control time and during the event-triggered timing control time, the target AP maintains communication with the user it serves.

 The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection of the present invention. Within the scope.

Claims

Rights request

A timing control method for a heterogeneous network, the method includes: determining a timing reference AP of a target access point AP in a heterogeneous network, where the target AP is an AP that needs to be timed, where Determining the timing reference AP of the target AP in the heterogeneous network includes: determining the target AP according to at least one of a coverage size of the searched AP, a transmit power, and a received power of a signal that the target AP receives the searched AP The timing reference AP, or determining the timing reference AP of the target AP according to whether the searched AP has the information of the target AP;

 The target AP adjusts the uplink receiving timing and/or the downlink transmitting timing by using the timing reference AP as a timing reference.

 The method according to claim 1, wherein the determining the timing reference AP of the target AP in the heterogeneous network comprises:

 Determining, according to configuration information of the console, a timing reference AP of the target AP, where the console is based on the coverage size of the AP that the target AP can search for, the transmit power, and the received power of the signal that the target AP receives the searchable AP. And determining, by the at least one timing reference AP of the target AP, or determining the timing reference AP of the target AP according to whether the AP that is searchable by the target AP has the target AP.

 The method according to claim 1, wherein the AP around the search target AP receives the received power of the searched AP according to the coverage size of the searched AP, the transmit power, and the target AP. At least one of determining a timing reference AP of the target AP includes:

 The target AP searches for the AP on the specified spectrum resource, and sets the searched AP set to (Αί\' i = 1,2, - - ]¥}, where N is the number of APs searched by the target AP. , N≥

The target AP reads the system information of each searched, obtains the transmit power of each reference signal used for the path loss estimation from the system information, and obtains a transmit power set. Combine (3⁄4^ = 1 ... , and measure the received power of each reference signal to obtain the received power set RSHf: 1, 2 wide'};

The target AP estimates an AP to which the target AP belongs according to the set of transmit powers ( _RS J.=12, −^ and the received power set '[RSRP=1, 2, . . . N), and the target The AP to which the AP belongs is determined as the timing reference AP of the target AP.

The method according to claim 3, wherein the target AP estimates the target according to the transmit power set (f3⁄4 _RS , i= 1 ...! ^ and the received power set {RSRi = 1 ... The AP to which the AP belongs, and the AP to which the target AP belongs is determined as the timing reference AP of the target AP, including:

A. For the received power set R i= 1 ...! All the grazing cars in ^ are sorted from large to small, resulting in |Η5ί?Ρ _{ώε:κί3⁄43} · ₄ , ] = 1 _? 3⁄4·· - mdex(k) E ... Δί]}, , where RSR3⁄4 _ides:i ) > RSRI _Sides(:2) >... > RSR _dex(N );

B. Sorting the transmit powers in the transmit power set j3⁄4 _RSi i= 1, 2, ~N} from large to small, and obtaining a maximum value of P _m3X ;

 C, set m = 1;

D, if 3⁄4^), the following conditions are met: ― Δ<

That is, the timing reference 所述 of the target ΑΡ, otherwise, after m: = m + 1, return to step D, where A is a predefined threshold.

 The method according to claim 1, wherein the determining, by the AP in the search target AP, the timing reference AP of the target AP according to whether the searched AP has the information of the target AP includes:

 A. The target AP searches for the AP on the specified spectrum resource, and sets the searched AP set to ΑΡ I = 1, 2, ...), where N is the number of APs searched by the target AP, N ≥ 1;

 B, setting = 1;

 C. The target AP is connected with the connection;

D. The target AP interacts with the information, if the side has the target The information of the AP is determined as the timing reference AP of the target AP, and if i = i + 1 is set, the process returns to step C.

 The method according to claim 1, wherein the AP around the search target AP receives the received power of the searched AP according to the coverage size of the searched AP, the transmit power, and the target AP. At least one of determining a timing reference AP of the target AP includes:

 The target AP searches for an AP on a specified spectrum resource, and sets the searched AP set to

, = 1,2, --i¥}, where N is the number of APs searched by the target AP, N≥1; the target AP reads the system information of each AP that is searched, from the system Obtain the coverage size information of each AP in the information;

 The target AP measures a reference signal for path loss estimation of each AP that is searched, and estimates a received power of the reference signal RSRP^

Selecting, according to the coverage size information of each AP, a plurality of APs with the largest coverage from the searched APs to form an AP.

= 1,2 _? '- , <};

According to the AP R subset (A. _dex j = 1 ... M _S M ≤ the received power RSR size of each AP, the AP subset (A _dex , = i, : 2 . -M _; M ≤ RSRI ^ The AP with the largest value is determined as the timing reference AP of the target AP.

 The method according to claim 1, wherein the AP around the search target AP receives the received power of the searched AP according to the coverage size of the searched AP, the transmit power, and the target AP. At least one of determining a timing reference AP of the target AP includes:

The target AP searches for the AP on the specified spectrum resource, and sets the searched AP set to {Αί3⁄4 _? ί = Ϊ _? -Ν}, where Ν is the number of APs searched by the target AP, N ≥ _; The target AP reads the system information of each searched ,, and obtains the transmit power of each of the reference signals for path loss estimation from the system information to obtain a transmit power set iU = U }; The target AP sets an AP corresponding to the maximum value of the transmit power set ^3⁄4 _RS , i = l, - V to the timing reference AP of the target AP.

 The method according to claim 1, wherein the target AP adjusts the downlink transmission timing by using a timing reference AP as a timing reference, and the following:

 Synchronizing the downlink signal of the timing reference AP with the downlink signal of the timing reference AP, and obtaining a downlink receiving timing of the downlink signal of the timing reference AP at the target AP;

The target AP adopts the downlink correction amount A ^{DL of the} target AP to adjust the obtained downlink reception timing, and determines the adjusted downlink reception timing as the downlink transmission timing of the target AP downlink signal.

 The method according to claim 1, wherein the target AP uses the timing reference AP as a timing reference, and the uplink receiving timing includes:

 The target AP sends an uplink synchronization signal to the timing reference AP for uplink synchronization, and the target AP acquires an uplink transmission timing that is synchronized with the timing reference AP according to the feedback of the timing reference AP; the target AP obtains the uplink correction amount of the target AP. The uplink transmission timing is adjusted, and the adjusted uplink transmission timing is determined as the uplink reception timing of the target AP uplink signal;

 The uplink transmission timing of the user is determined according to the uplink reception timing of the target AP and the transmission delay between the target AP and the user it serves.

 The method according to claim 1, wherein the target AP adjusts the uplink receiving timing and/or the downlink transmitting timing by using the timing reference AP as a timing reference, including:

 Obtaining, by the target AP, a timing adjustment amount of the target AP determined by the timing reference AP by using information exchange with a timing reference AP;

 The target AP uses the timing adjustment amount to perform uplink receiving timing and/or downlink transmission timing adjustment;

 The determining the timing adjustment amount of the target AP includes:

The timing reference AP acquires a user set {(/i = 1 ... L, the service AP of each user in the user set is a timing reference AP, and each user in the user set is close to Target AP, where L is the total number of users in the set of users;

 The user in the user set performs downlink synchronization with the timing reference AP to acquire downlink receiving timing from the timing reference AP;

 The user in the user set performs downlink synchronization with the target AP to obtain downlink receiving timing from the target AP.

 The user L in the user set estimates the timing difference between the downlink receiving timing from the timing reference AP and the downlink receiving timing from the target AP, and forwards the timing difference to the timing reference AP;

 The timing reference AP estimates the timing adjustment amount of the target AP using the timing difference fed back by the user in the user set.

 The method according to claim 1, wherein the target AP adjusts the uplink receiving timing and/or the downlink transmitting timing by using the timing reference AP as a timing reference, including:

 The target AP estimates a transmission timing adjustment amount of the target AP according to a timing difference value fed back by a user in the user set i = 1, 2, ... L), each of the user sets [Μ ΐ = 1 2, - L} The user's service AP is the target AP, where L is the total number of the users;

 The target AP performs adjustment of uplink reception timing and/or downlink transmission timing by using the transmission timing adjustment amount;

 The feedback manner of the timing difference includes:

 The user in the user set performs downlink synchronization with the timing reference AP to obtain a downlink receiving timing from the timing reference AP.

 The user in the user set performs downlink synchronization with the target AP to obtain downlink receiving timing from the target AP.

 The user in the user set "estimates the timing difference between the downlink reception timing from the timing reference AP and the downlink reception timing from the target AP, and feeds back the timing difference to the target AP.

12. The method of claim 1, wherein the target AP is based on a timing reference The AP is a timing reference, and the adjusting of the uplink receiving timing and/or the downlink transmitting timing includes: the target 获取 acquiring the timing reference by interacting with the information of the timing reference ΑΡ

ΑΡ Determine the target 下行 downlink transmission timing;

 The target 估计 estimates a timing adjustment amount according to the downlink transmission timing and the currently used downlink transmission timing;

 The target 进行 performs downlink transmission timing and/or uplink reception timing adjustment according to the timing adjustment amount;

 The determining the downlink transmission timing of the target 包括 includes:

 The timing reference ΑΡ obtains the user set = 1, 2, - L), the service AP of each user in the user set is a timing reference AP, and each user i/ in the user set is close to the target AP Where L is the total number of users in the set of users;

 The timing reference AP estimates the transmission delay between the timing reference AP and the user it serves by the uplink transmission timing of the served user.

 The timing reference AP estimates the downlink transmission timing of the target AP by using its own downlink transmission timing and the transmission delay of the user in the user set.

 The method according to claim 1, wherein the target AP adjusts the uplink receiving timing and/or the downlink transmitting timing by using the timing reference AP as a timing reference, and the following:

 Obtaining an uplink receiving timing of the target AP estimated by the timing reference AP by using the information exchange with the timing reference AP;

 And determining, by the target AP, an adjustment timing according to an uplink receiving timing estimated by the timing reference AP and an uplink receiving timing currently used;

 The target AP uses the timing adjustment amount to perform uplink receiving timing and/or downlink transmission timing adjustment;

 The method for estimating an uplink receiving timing of the target AP includes:

The timing reference AP acquires a user set 0 i = 1, '2, ... L], the service AP of each user i/ in the user set is a timing reference AP, and each user i in the user set is close Target AP, where L is the total number of users in the set of users;

 The timing reference AP estimates the uplink reception timing of the target AP by using the uplink transmission timing advance of the user set i A^ i = 1, 2, - L}.

 The method according to claim 13, wherein the timing reference AP estimates the uplink receiving timing of the target AP by using an uplink transmission timing of the user in the user set:

The timing reference AP estimates an uplink receiving timing of the target AP according to an uplink transmission timing advance {TA _s , i = 1 2, 〜L} of the user set and a downlink transmission timing adopted by the timing reference AP itself,

3⁄4echmark _: i = ― f Ϊ = 1,2, ' L}), where T _{eehs ark>} ^ is the uplink reception timing of the target AP, { i

for

or

 The method according to claim 13, wherein the estimated timing of the uplink receiving timing estimated by the target AP according to the timing reference AP and the currently used uplink receiving timing includes:

 The target AP estimates the uplink receiving timing of the user UEj by using the uplink receiving timing and the uplink correction amount, and the serving AP of the user UEj is the target AP.

3⁄4l| = 3⁄4ec3⁄4mark,^ + ^― ^S where j is the uplink reception timing of the UE UEj, and lagj is the delay of the target AP to the user ;;

The AP will target ^{_{T: e: chffiark ^ + ¾}} ' and the target AP currently employed uplink reception timing determined by comparing the timing adjustment amount.

The method according to claim 1, wherein the target AP adjusts the uplink receiving timing and/or the downlink transmitting timing by using the timing reference AP as a timing reference, and the following: Obtaining, by the target AP, the timing adjustment amount of the target AP estimated by the timing reference AP by performing information interaction with the timing reference AP;

 The target AP performs uplink receiving timing and/or downlink transmission timing adjustment according to the timing adjustment amount;

 The method for estimating the timing adjustment amount of the target AP includes:

 Obtaining a user set (i = 1, 2, ... L}, the service AP of each user in the user set is a target AP, where L is the total number of the users;

 The timing reference AP acquires an uplink physical signal of the user 1 in the user set; and the timing reference AP estimates an uplink receiving timing by detecting an uplink physical signal of the user 1.

 The timing reference AP compares the reception timing of the user set with the reception timing of the user served by itself, and estimates the timing adjustment amount of the target AP.

 The method according to claim 1, wherein the target AP adjusts the uplink receiving timing and/or the downlink transmitting timing by using the timing reference AP as a timing reference, including:

The target AP acquires an uplink physical signal of the user L3⁄4 in the user set {.L1⁄2 i = 1 _ί 2, TM L), and the service AP of each user in the user set· . , i = 1 ... L} is timed a reference AP, and a target 靠近 of each user in the user set, where L is the total number of users in the user set;

 The target 估计 estimates an uplink receiving timing of the user set by detecting an uplink physical signal of the user;

 The target AP compares the uplink receiving timing of the user set with the uplink receiving timing of the user served by the user, and estimates the timing adjustment amount of the target AP;

 The target AP performs adjustment of uplink reception timing and/or downlink transmission timing according to the timing adjustment amount.

The method according to claim 17, wherein the target AP compares an uplink receiving timing of the user set with an uplink receiving timing of a user served by the user, and estimates The timing adjustments of the target AP include:

The target AP estimates the transmission timing of the target user UEj by using the uplink reception timing of the user set, AirivaTim i = - and its configured uplink correction amount Δ ^{υ £ 3} = ₄ = _ee3⁄4i ^ _k ^ + ^ ^L ― iagj

3⁄4 bmar3⁄4:.ui = (( ri¥alTinie _Si I = l _s 2 _f - L}) , (Arrival Jime _S! i = 1,2 function / ) takes the form:

∑^ ₌₁ ArrivalTimej

 iCfArriv lTinie-i, i = 1 ,-" L}) =

 L

 Or

(( Απ ¥3ΪΤίπι3⁄4 ί = 12 " - L}) = miri({Arriva!Time _i; i = 1,2 _? -- - L}) or

fCiAriivalTimei, i = 1,2, ''' }) =

= 1,2,"· L});

The target AP compares T _eehmark , + with the uplink reception timing currently used by the target AP, and determines the timing adjustment amount of the target AP.

 The method according to claim 1, wherein the target AP adjusts the uplink receiving timing and/or the downlink transmitting timing by using the timing reference AP as a timing reference, including:

 The target AP in the user acquires the uplink physical signal of the user in the user set i = 1, 2, - L}, the user set is = .U., ... the user [/. is the user close to the target AP Where L is the total number of users;

 The target AP estimates the uplink reception timing of the user 1/ at the target AP according to the uplink physical signal of the user;

The target AP AP acquired from the user of the timing of the reference timing reference AP 7 £ ₃ estimated reception timing of the uplink timing reference ΑΡ, wherein said user reception timing estimating method comprising the AP in the uplink timing reference: the The timing reference AP acquires an uplink physical signal of the user in the user set, and the timing reference AP estimates the uplink physical signal according to the user IJ. The uplink receiving timing of the user at the timing reference AP;

 Obtaining, by the target AP, an uplink receiving time difference between the uplink receiving timing of the target AP and the uplink receiving timing of the user at the timing reference AP, and obtaining a time difference of the uplink receiving timing of the user set { 】;

 Determining, by the target AP, a timing adjustment amount of the target AP by using a time difference {^} of an uplink receiving timing of the user set;

 The target AP adjusts the uplink reception timing and/or the downlink transmission timing by using the timing adjustment amount of the target AP.

 The method according to any one of claims 10 to 19, wherein the step of adjusting the uplink receiving timing and/or the downlink transmitting timing by using the timing adjustment amount by the target AP specifically includes:

 The downlink transmission timing of the target AP is delayed, and the delay time is the timing adjustment amount; the uplink reception timing of the target AP is advanced, and the advance time is the timing adjustment amount.

 The method according to claim 1, wherein before the determining the timing reference AP of the target AP in the heterogeneous network, the method further includes:

 Power on and initialize the target AP in the heterogeneous network.

 The method according to claim 1, wherein the method further comprises: in a set clock cycle, the target AP uses the current downlink transmission timing and the uplink reception timing to communicate with the served user;

 When the clock period expires, the target AP uses the timing reference AP as a timing reference to adjust the uplink receiving timing and/or the downlink transmitting timing.

 The method of claim 1, 21 or 22, wherein the method further comprises:

When it is detected that a trigger event for triggering the timing control occurs, determining whether the timing reference AP needs to be re-determined according to the trigger event, and if yes, re-determining the timing reference AP of the target AP, and timing with the re-determined timing reference AP Benchmark, for uplink reception timing and/or Adjustment of the line transmission timing.

The method according to claim 23, wherein the method further comprises: when the target AP needs to receive a downlink signal from the timing reference AP, when the target AP communicates with a user served thereby When the spectrum resource used is the same as the spectrum resource used for communication between the target AP and the timing reference AP, if the target AP needs to receive the downlink signal from the timing reference AP on the spectrum resource or the target AP needs to be in the spectrum The resource uplink transmits a signal to the timing reference AP, and the target AP uses the time period during the time period during which the initial timing control is performed, the time period during which the periodic timing control is performed, and the time period during which the event-triggered timing control is performed. Configuration by the serviced user or stop scheduling the user _: causing the user to interrupt the target AP during the time period during which the initial timing control is performed, during the time period during which the periodic timing control is performed, and during the time period during which the event-triggered timing control is performed. Up and/or downstream communication.

 The method according to claim 23, wherein the method further comprises: when the spectrum resource used by the target AP and the user interacts with the timing information is different from the spectrum resource used for communication between the target AP and the timing reference AP Or when the connection between the target AP and the timing reference AP is in the wired connection mode, during the period of initial timing control, during the period of periodic timing control, and during the period of event-triggered timing control, The target AP maintains communication with the users it serves.

A timing control method for a heterogeneous network, the method includes: the timing reference access point AP provides a timing reference for the target AP, so that the target AP uses the timing reference AP as a timing reference. Performing adjustment of the uplink receiving timing and/or the downlink transmitting timing, where the timing reference AP is the receiving, by the target AP, according to the coverage size of the searched AP, the transmitting power, and the receiving of the signal of the search AP by the target AP. An AP that is a timing reference of the target AP determined by at least one of the powers, or an AP that is a timing reference of the target AP determined by the target AP according to whether the searched AP has the information of the target AP. The target AP is an AP that needs to be timed in a heterogeneous network.

An access point, where the access point is a target AP that needs to be scheduled in a heterogeneous network, and the access point includes:

 a timing reference AP determining unit, configured to determine a timing reference AP of the target AP, where the determining the timing reference AP of the target AP includes: according to the coverage size of the searched AP, the transmit power, and the target AP receiving the searched Determining, by at least one of the received power of the signal of the AP, the timing reference AP of the target AP, or determining the timing reference AP of the target AP according to whether the searched AP has the information of the target AP;

 The timing adjustment unit is configured to adjust the uplink receiving timing and/or the downlink transmitting timing of the target AP by using the timing reference AP as a timing reference.

 The access point according to claim 27, wherein the timing reference AP determining unit comprises:

 a timing reference AP configuration module, configured to determine, according to configuration information of the console, a timing reference AP of the target AP, where the console is configured according to the coverage size, the transmit power, and the target of the AP that can be searched by the target AP Determining, by the AP, at least one of received power of a signal of the searchable AP, a timing reference AP of the target AP, or determining, according to information of whether the target AP is searchable by the target AP, the target AP The timing reference AP of the AP.

 The access point according to claim 27, wherein the timing reference AP determining unit comprises:

 a first AP search module, configured to enable the target AP to search for an AP on a specified spectrum resource, and set the searched AP set to AP = 1, 2, ~, where N is the AP searched by the target AP. Number, N> 1;

a first power acquisition module, configured to read system information of each AP that is searched, obtain the transmit power of each reference signal used for path loss estimation from the system information, and obtain a transmit power set 3⁄4 _RSi i = ... , and measure the received power of each reference signal to obtain a received power set (RSRi i = ■ M}; a first timing reference AP determining module for using the transmit power set {P _L 1⁄2 _S! i = 1 ...! And the received power set RSRf = 1, 2, ... ^ estimates the AP to which the target AP belongs, and determines the AP to which the target AP belongs as the timing reference AP of the target AP.

 The access point according to claim 27, wherein the timing reference AP determining unit comprises:

 a second AP search module, configured to enable the target AP to search for an AP on a specified spectrum resource, and set the searched AP set to ίΑΡ ϊ = 1, 2, ...! ^ , where Ν is the target ΑΡ the number of ΑΡ found, Ν ≥ 1;

 a connection establishing module, configured to establish a connection between the target ΑΡ and each of the searched 并 and to perform information interaction;

 And a second timing reference ΑΡ determining module, configured to determine, according to the information associated with the connection establishing module, the ΑΡ of the searched information having the target ΑΡ as the timing reference 所述 of the target ΑΡ.

 The access point according to claim 27, wherein the timing reference ΑΡ determining unit comprises:

 The third search module is configured to search for the target ΑΡ on the specified spectrum resource, and set the searched ΑΡ set to i = l, 〜i3⁄4, where N is the number of APs searched by the target AP, N > 1;

 An overlay information processing module, configured to: the target AP reads system information of each AP that is searched, obtains coverage size information of each AP from the system information, and according to the coverage size information of each AP , selecting the APs with the largest coverage from the searched APs

AP subset ^ _{1 £} ^ CD I = l _s ... M < N} _;

a second power acquisition module, configured to enable the target AP to measure a reference signal used for path loss estimation of each AP that is searched, and estimate a received power RSRP _{i of} the reference signal _{; and a} third timing reference AP determining module , for using the AP subset {Ai3⁄4 _{Kdes m !} J = 1,2, - - ₅ < JV) The received power RSR of each AP, which takes the value of RSR in the AP subset ^ _dex , J = 1 - M, M ≤ N} The largest AP is determined to be the timing reference AP of the target AP.

 The access point according to claim 27, wherein the timing reference AP determining unit comprises:

 a fourth AP search module, configured to enable the target AP to search for an AP on a specified spectrum resource, and set the searched AP set to i=l, 2f\3⁄4, where N is the AP searched by the target AP. Number, N> 1 ;

a third power acquisition module, configured to: the target AP reads the system information of each searched, and obtains, from the system information, the transmit power of each reference signal used for path loss estimation, to obtain Transmit power set _RS j =

a fourth timing reference ΑΡ determining module, configured to enable the target 设置 to set an AP corresponding to a maximum value of the transmit power set {l3⁄4 _RSi i = as a timing reference of the target AP

AP.

 The access point according to any one of claims 27 to 32, wherein the timing adjustment unit comprises:

 a downlink receiving timing acquiring module, configured to synchronize the target AP with a downlink signal of the timing reference AP, to obtain a downlink receiving timing of the downlink signal of the timing reference AP at the target AP;

a downlink transmission timing adjustment module, configured to adjust a downlink reception timing obtained by the downlink reception timing acquisition module by using a downlink correction amount Δ ¹ ^ of the target AP, and determine the adjusted downlink reception timing as the target downlink downlink signal Downlink transmission timing.

 The access point according to any one of claims 27 to 32, wherein the timing adjustment unit comprises:

An uplink transmit timing acquisition module, configured to enable the target to transmit an uplink synchronization signal to the timing reference, perform uplink synchronization, and obtain the target according to the feedback of the timing reference ΑΡ The uplink transmission timing of the AP at the timing reference AP synchronization;

 The uplink receiving timing adjustment module is configured to adjust the obtained uplink transmission timing by using the uplink correction amount Δ of the target AP, and determine the adjusted uplink transmission timing as an uplink receiving timing of the target uplink signal;

 And an uplink transmission timing determining module, configured to determine an uplink transmission timing of the user according to an uplink receiving timing of the target 确定 determined by the uplink receiving timing adjustment module, and a transmission delay between the target ΑΡ and a serving user thereof.

 The access point according to any one of claims 27 to 32, wherein the timing adjustment unit comprises:

 a first information interaction module, configured to enable the target 获取 to obtain a timing adjustment amount of the target ΑΡ determined by the timing reference ΑΡ by interacting with information between the timing reference ;;

 a first timing adjustment module, configured to enable the target 进行 to perform uplink receiving timing and/or downlink transmission timing adjustment by using a timing adjustment amount obtained by the first information interaction module;

 The manner in which the timing adjustment amount of the target ΑΡ is determined includes:

 The timing reference ΑΡ obtains a set of users (L, i = 1, 2, - L), the service AP of each user ί· in the user set is a timing reference ΑΡ, and each user in the user set is close to the target ΑΡ, where L is the total number of users in the set of users;

 The user in the user set performs downlink synchronization with the timing reference AP to obtain downlink receiving timing from the timing reference AP;

 The user in the user set performs downlink synchronization with the target AP to obtain downlink receiving timing from the target AP.

 The user in the user set estimates the timing difference between the downlink receiving timing from the timing reference AP and the downlink receiving timing from the target AP, and forwards the timing difference to the timing reference AP;

The timing reference AP estimates the timing adjustment amount of the target AP using the timing difference reported by the user within the user set.

The access point according to any one of claims 27 to 32, wherein the timing adjustment unit comprises:

 a first timing adjustment amount obtaining module, configured to: cause the target AP to estimate a transmission timing adjustment amount of the target AP according to a timing difference reported by a user in the user set ii i = 1, 2, 'L], the user set ^ The service AP of each user in i = is the target AP, where

L is the total number of users;

 a second timing adjustment module, configured to enable the target AP to perform uplink reception timing and/or downlink transmission timing adjustment by using the obtained transmission timing adjustment amount;

 The feedback manner of the timing difference includes:

 The user in the user set performs downlink synchronization with the timing reference AP to obtain a downlink receiving timing from the timing reference AP.

 The user in the user set performs downlink synchronization with the target , to obtain downlink receiving timing from the target ;;

 The user in the set of users estimates the timing difference between the downlink reception timing from the timing reference 和 and the downlink reception timing from the target ,, and feeds the timing difference back up to the target ΑΡ.

 The access point according to any one of claims 27 to 32, wherein the timing adjustment unit comprises:

 a second information interaction module, configured to enable the target 获取 to obtain a downlink transmission timing of the target ΑΡ estimated by the timing reference ΑΡ by interacting with information between the timing reference ;;

 a second timing adjustment quantity obtaining module, configured to: adjust, by the target ΑΡ, a downlink transmission timing obtained by the second information interaction module and a downlink transmission timing estimation timing currently used by the target ;;

 a third timing adjustment module, configured to enable the target 进行 to perform adjustment of its downlink transmission timing and/or uplink reception timing by using the timing adjustment amount;

The estimation manner of the downlink transmission timing of the target ΑΡ includes: The timing reference AP acquires a set of users, ί = 1Λ—L], the service AP of each user in the user set is a timing reference AP, and each user in the user set is close to the target AP, where L is The total number of users in the user collection;

 The timing reference AP estimates the transmission delay between the timing reference AP and the user it serves by the uplink transmission timing of the served user.

 The timing reference AP estimates the downlink transmission timing of the target AP by using its own downlink transmission timing and the transmission delay of the user in the user set.

 The access point according to any one of claims 27 to 32, wherein the timing adjustment unit comprises:

 a third information interaction module, configured to enable the target AP to obtain an uplink receiving timing of the target AP estimated by the timing reference AP by using information exchange with the timing reference AP;

 a third timing adjustment quantity obtaining module, configured to enable the target AP to adjust an uplink receiving timing obtained by the third information interaction module and an uplink receiving timing estimated timing currently used by the target AP;

 a fourth timing adjustment module, configured to enable the target AP to perform uplink receiving timing and/or downlink transmission timing adjustment by using the timing adjustment amount;

 The method for estimating an uplink receiving timing of the target AP includes:

 The timing reference AP acquires a user set {(/ i = 1 ... L), the service AP of each user in the user set is a timing reference AP, and each user i/ in the user set is close to the target AP, where L is the total number of users in the user set;

The timing reference AP estimates the uplink reception timing of the target AP by using the uplink transmission timing advance {TA _{S j} i = 1, 2, .-' L} of the user set.

 The access point according to any one of claims 27 to 32, wherein the timing adjustment unit comprises:

a fourth information interaction module, configured to enable the target AP to acquire, by using information exchange with the timing reference AP, a timing adjustment amount of the target AP estimated by the timing reference AP; a fifth timing adjustment module, configured to enable the target AP to perform uplink receiving timing and/or downlink transmission timing adjustment according to the timing adjustment amount;

 The method for estimating the timing adjustment amount of the target AP includes:

 Obtaining the user set = 1, 2, " L] , the service AP of each user in the user set is the target AP, where L is the total number of the users;

 The timing reference AP acquires an uplink physical signal of the user in the user set; the timing reference AP estimates an uplink receiving timing by detecting an uplink physical signal of the user;

 The timing reference AP compares the reception timing of the user set with the reception timing of the user served by itself, and estimates the timing adjustment amount of the target AP.

 The access point according to any one of claims 27 to 32, wherein the timing adjustment unit comprises:

a first parameter configuration information obtaining module, configured to enable the target AP to acquire an uplink physical signal of the user L1⁄4 in the user set {Ue i = i 2f L}, the user set {U i = ί _; 2 _ί ... L) The service AP of each user ^i- is a timing reference AP, and the target APs in the user set are close to the target AP, where L is the total number of users in the user set; the first uplink receiving timing estimation module is used And causing the target AP to estimate an uplink receiving timing of the user set=1/2, '·· by detecting an uplink physical signal of the user Ue^; and a fifth timing adjustment amount acquiring module, configured to enable the target The AP compares the uplink receiving timing of the user set with the uplink receiving timing of the user served by the user, and estimates the timing adjustment amount of the target AP;

 The sixth timing adjustment module is configured to enable the target AP to perform uplink receiving timing and/or downlink transmission timing adjustment according to the timing adjustment amount.

 The access point according to any one of claims 27 to 32, wherein the timing adjustment unit comprises:

a second parameter configuration information obtaining module, configured to acquire the user set by the target AP {UE _b i = - L) an uplink physical signal of the user, the user set is a user of {Ιΐε^ = 1⁄2, the user close to the target ,, where L is the total number of the users;

 a second uplink receiving timing estimation module, configured to enable the target 估计 to estimate an uplink receiving timing of the user in the target according to the uplink physical signal of the user obtained by the second parameter configuration information acquiring module;

a fifth information interaction module, configured to: obtain, by the target ΑΡ, the timing reference ΑΡ estimated user £/E _s from the timing reference 上行 at an uplink receiving timing of the timing reference AP, where the user is at the timing reference AP The method for estimating the uplink receiving timing includes: the timing reference AP acquires an uplink physical signal of the user in the user set, and the timing reference AP estimates an uplink receiving timing of the user in the timing reference AP according to the uplink physical signal of the user. ; uplink reception time difference calculating means for obtaining the target AP receives uplink user 7 £ ₃ between the reference timing of the uplink reception timing of the time difference AP in the uplink reception timing of the target AP and the user I, to give a set of users { a time difference of the uplink reception timing of the ii = sixth timing adjustment amount acquisition module, configured to enable the target AP to determine the timing adjustment amount of the target AP by using the time difference "4} of the uplink reception timing of the user set;

 And a seventh timing adjustment module, configured to enable the target AP to perform uplink receiving timing and/or downlink transmission timing adjustment by using a timing adjustment amount of the target AP.

 42. An access point, where the access point is used to provide a timing reference for a target AP, so that the target AP performs uplink receiving timing and/or downlink with the access point as a timing reference. Adjusting a transmission timing, where the access point is determined by the target AP according to at least one of a coverage size of the searched AP, a transmit power, and a received power of a signal that the target AP receives the searched AP. The AP of the timing reference of the target AP, or the AP that is the timing reference of the target AP determined by the target AP according to the information of the target AP, and the target AP is heterogeneous. A timed AP is required in the network.