RU2464734C2 - Management of mutual noise using power and signal attenuation profiles - Google Patents

Abstract

FIELD: information technologies.

SUBSTANCE: method to control mutual noise in a wireless communication system carried out by a network unit, comprises stages, at which a transmission power profile is determined, besides, the transmission power profile establishes different power values depending on time, maximum and minimum power levels are determined for the transmission power profile, a time period is determined for the transmission power profile, and the transmission power profile and at least one index of the transmission power profile are sent to multiple access points.

EFFECT: improved control of mutual noise.

38 cl, 30 dwg

Description

DESCRIPTION

Priority statement in accordance with 35 U.S.C §119

This application claims advantage and priority in accordance with the provisional patent application of US Patent No. 60/974428, filed September 21, 2007, and to which patent attorney registration number 071700P1 has been assigned; US Provisional Patent Application No. 60/974449, filed September 21, 2007, and to which patent attorney registration number 071700P2 has been assigned; US Provisional Patent Application No. 60/974794, filed September 24, 2007, and to which patent attorney registration number No. 071700P3 has been assigned; and U.S. Patent Application No. 60/977294, filed October 3, 2007, and to which patent attorney registration number 071700P4 has been assigned, the disclosure of each of which is incorporated herein by reference.

State of the art

FIELD OF THE INVENTION

This application, in General, relates to wireless data transmission and, more specifically, but not exclusively, to improve communication characteristics.

Introduction

Wireless communication systems are widely used to provide the transmission of various types of data (e.g., voice, data, multimedia services, etc.) to many users. As the demand for high-speed data transmission and multimedia services is growing rapidly, a problem has arisen with the implementation of efficient and reliable communication systems with improved features.

In addition to conventional network mobile phone base stations, base stations with a small coverage area (for example, installed at the user's home) can be deployed to provide a more reliable wireless indoor coverage area for mobile devices. Such small service base stations are commonly known as access point base stations, home nodes B, or femtocells. Typically, such base stations with a small service area are connected to the Internet and the networks of mobile operators via a DSL router (DSL, digital subscriber line) or cable modem.

Since the radio frequency ("RF") coverage area of base stations with a small coverage area may not be optimized by the mobile operator, and the deployment of such base stations may be performed specifically for the desired purpose, RF interference problems may occur. In addition, soft transfer of mobile devices may not be supported for base stations with a small coverage area. Therefore, there is a need for improved interference management for wireless communication networks.

SUMMARY OF THE INVENTION

The essence of exemplary aspects of the disclosure is as follows. It should be understood that any reference here to aspects of the terminology may refer to one or more aspects of the disclosure.

This disclosure, in some aspects, relates to mutual interference control using fractional reuse technologies. For example, in some aspects, fractional reuse may include using a portion of a set of assigned interlaces of a hybrid automatic data retransmission request (“HARQ”) for uplink or downlink traffic. In some aspects, fractional reuse may include using a portion of a time slot allocated to uplink or downlink traffic. In some aspects, fractional reuse may include the use of a portion of the frequency spectrum allocated for uplink or downlink traffic. In some aspects, fractional reuse may include using a portion of a set of spreading codes (e.g., SF16) allocated for uplink or downlink traffic. In some aspects, such sites may be defined and assigned so that neighboring nodes use non-overlapping resources. In some aspects, the definition and designation of such sites may be based on feedback related to mutual interference.

This disclosure, in some aspects, relates to interference management by utilizing technologies related to power management. For example, in some aspects, the transmit power of the access terminal may be controlled to reduce interference in an unassociated access point. In some aspects, the noise figure or attenuation upon reception at the access point is controlled based on the strength of the received signal associated with signals from one or more access terminals.

This disclosure in some aspects relates to mutual interference control using a transmit power profile and / or attenuation profile. For example, downlink transmit power or extension of an uplink receiver can be dynamically adjusted at a node as a function of time. Here, different nodes can use different phases of the profile to reduce mutual interference between nodes. In some aspects, the profile may be determined based on feedback related to mutual interference.

Brief Description of the Drawings

These and other exemplary aspects of the disclosure will be described in the detailed description of the invention and the attached claims that follow, and in the attached drawings, in which:

In FIG. 1 shows a simplified block diagram of several exemplary aspects of a communication system;

in FIG. 2 is a simplified block diagram illustrating several exemplary aspects of components in an exemplary communication system;

in FIG. 3 is a flowchart of several exemplary aspects of operations that may be performed to control interference;

in FIG. 4 is a flowchart of several exemplary aspects of operations that can be performed to control mutual interference using fractional reuse based on HARQ interlace;

in FIG. 5 is a flowchart of several exemplary aspects of operations that can be performed to control interference by using a transmit power profile;

in FIG. 6 is a simplified diagram illustrating several aspects of an example transmit power profile;

in FIG. 7 is a flowchart of several exemplary aspects of operations that can be performed to control interference by using a reception attenuation profile;

in FIG. 8 is a simplified diagram illustrating several aspects of an example reception attenuation profile;

in FIG. 9 and 10 show flow charts of several exemplary aspects of operations that can be performed to control mutual interference by applying fractional reuse based on a time interval;

in FIG. 11 and 12 are flowcharts of several exemplary aspects of operations that can be performed to control mutual interference by applying fractional reuse based on the frequency spectrum;

in FIG. 13 and 14 are flowcharts of several exemplary aspects of operations that can be performed to control mutual interference by applying spreading fractional reuse based on the spreading code;

in FIG. 15 is a flowchart of several exemplary aspects of operations that can be performed to control interference by using transmit power control;

in FIG. 16 is a simplified diagram illustrating several aspects of an example power control function;

in FIG. 17 is a flowchart of several exemplary aspects of operations that can be performed to control interference by dynamically adjusting the attenuation coefficient;

in FIG. 18 is a simplified diagram of a wireless communication system;

in FIG. 19 is a simplified diagram of a wireless communication system including femto nodes;

in FIG. 20 is a simplified diagram illustrating service areas for wireless communications;

in FIG. 21 is a simplified block diagram of several exemplary aspects of communication components; and

in FIG. 22-30 show simplified block diagrams of several exemplary aspects of devices configured to control interference, in accordance with the present description.

In accordance with ordinary practice, the various elements illustrated in the drawings may not be drawn to scale. Accordingly, the sizes of the various elements can be arbitrarily increased or decreased for clarity of presentation. In addition, some of the drawings may be simplified for clarity of presentation. Thus, the drawings may not represent all the components of this device or method. And, ultimately, the same reference numerals can be used to refer to the same elements throughout the description and drawings.

Detailed description

Various aspects of the disclosure are described below. It should be understood that the description provided herein can be embodied in a wide variety of forms, and that any particular structure, function, or both, disclosed herein may be simply representative. Based on the description provided herein, it will be understood by one skilled in the art that the aspects disclosed herein may be embodied independently of any other aspects and that two or more of these aspects may be combined in various ways. For example, a device may be implemented, or the method may be practiced using any number of the aspects presented herein. In addition, such a device may be implemented, or such a method may be practiced using another structure, function, or structure and function, in addition to or in addition to one or more of the aspects presented herein. In addition, an aspect may comprise at least one element of a claim.

In FIG. 1 illustrates an exemplary aspect of a communication system 100 where distributed nodes (e.g., access points 102, 104 and 106) provide wireless connectivity to other nodes (e.g., access terminals 108, 110, and 112) that can be installed in or can move through an associated geographic area. In some aspects, access points 102, 104, and 106 may communicate with one or more network nodes (eg, a centralized network controller, such as network node 114) to facilitate connectivity to a wide area network.

An access point, such as access point 104, may be limited so that only certain access terminals (eg, access terminal 110) will have permission to access the access point, or the access point may be limited in some other way. In such a case, the restricted access point and / or its associated access terminals (e.g., access terminal 110) may interfere with other nodes in the system 100, such as, for example, an unlimited access point (e.g., macro access point 102), and their associated access terminals (e.g., access terminal 108), another restricted access point (e.g., access point 106), or their associated access terminals (e.g., access terminal 112). For example, the closest access point for a given access terminal may not represent serving access points for this access terminal. Therefore, transmission through these access terminals may interfere with reception at the access terminal. As described here, fractional reuse, power control, and other technologies can be used to reduce mutual interference.

Exemplary system operations, such as system 100, will be described in detail below with reference to the flowchart shown in FIG. 2. For convenience, the operations shown in FIG. 2 (or any other operations disclosed or described herein) may be described as being performed by certain components (eg, components of a system 100 and / or components of a system 300, as shown in FIG. 3). However, it should be understood that these operations can be performed by other types of components and can be performed using a different number of components. It should also be understood that one or more of the operations described herein may not be used in this embodiment.

For the purpose of illustration, various aspects of the disclosure will be described in the context of a network node, access point, and access terminal that communicate with each other. However, it should be understood that the description given here may be applied to other types of devices or devices that may be named using different terminology.

In FIG. 3 illustrates several exemplary components that can be implemented in a network node 114 (e.g., a radio network controller), an access point 104, and an access terminal 110 as described herein. It should be understood that the components illustrated for one of these nodes can also be embedded in other nodes in the system 100.

Network node 114, access point 104, and access terminal 110 include transceivers 302, 304, and 306, respectively, for exchanging data with each other and with other nodes. The transceiver 302 includes a transmitter 308 for transmitting signals, and a receiver 310 for receiving signals. The transceiver 304 includes a transmitter 312 for transmitting signals, and a receiver 314 for receiving signals. The transceiver 306 includes a transmitter 316 for transmitting signals, and a receiver 318 for receiving signals.

In a typical embodiment, the access point 104 communicates with the access terminal 110 through one or more wireless links, and the access point 104 communicates with the network node 114 via the feedback channel. It should be understood that wireless or non-wireless communication lines can be used between these or other nodes in various embodiments. Therefore, transceivers 302, 304, and 306 may include wireless and / or non-wireless communication components.

Network node 114, access point 104, and access terminal 110 also include various other components that can be used in conjunction with mutual interference control, as described herein. For example, network node 114, access point 104, and access terminal 110 may include mutual interference controllers 320, 322, and 324, respectively, for reducing mutual interference and for providing other related functions, as described herein. The interference controller 320, 322, and 324 may include one or more components for performing various types of interference management. Network node 114, access point 104, and access terminal 110 may include communication controllers 326, 328, and 330, respectively, for controlling communication with other nodes and for providing other related functions, as described herein. Network node 114, access point 104, and access terminal 110 may include time controllers 332, 334, and 336, respectively, for controlling communication with other nodes and for providing other related functions, as described herein. Other components shown in FIG. 3 will be described in the following description.

For purposes of illustration, mutual interference controllers 320 and 322 are presented as including several controller components. In practice, however, this embodiment may not use all of these components. Here, the HARQ controller component 338 or 340 may provide a function related to HARQ interlace operations, as described herein. The profile controller component 342 or 344 may provide a function related to a transmit power profile or to reception attenuation operations, as described herein. A time controller component 346 or 348 may provide a function related to operations of a time interval portion, as described herein. The spectral mask controller component 350 or 352 may provide a function related to the operations of the spectral mask, as described herein. An extension code controller component 354 or 356 may provide a function related to extension code operations, as described herein. The transmit power controller component 358 or 360 may provide a function related to transmit power operations, as described herein. The attenuation coefficient controller component 362 or 364 may provide a function related to attenuation coefficient operations, as described herein.

In FIG. 2 shows how a network node 114, an access point 104, and an access terminal 110 can communicate with each other to provide mutual interference control (e.g., reduce mutual interference). In some aspects, these operations may be used in the uplink and / or in the downlink to reduce mutual interference. Typically, one or more of the techniques described with reference to FIG. 2 can be used in more specific embodiments, which are described below with reference to FIG. 4-18. Therefore, for the purpose of clarity of presentation, the description of more specific embodiments may again not contain a detailed description of these technologies.

As represented by block 202, the network node 114 (eg, mutual interference controller 320), if necessary, determines one or more mutual interference control parameters for access point 104 and / or access terminal 110. Such parameters can take various forms. For example, in some embodiments, the network node 114 may determine fractional reuse parameters to reduce mutual interference in the uplink and / or downlink. As noted here, such fractional reuse may include the use of one or more HARQ interlaces, puncturing, frequency spectrum or extension codes. In some embodiments, the network node 114 may determine other types of interference management information, such as, for example, transmission power parameters and reception attenuation parameters. Examples of such parameters will be described in more detail below with reference to FIGS. 4-18.

In some aspects, determining interference parameters may include determining how to allocate one or more resources. For example, the operations of block 402 may include determining how the allocated resource (e.g., frequency spectrum, etc.) can be divided for fractional reuse. In addition, the determination of fractional reuse parameters may include determining to what extent the allocated resource (e.g., how many HARQ interlaces, etc.) can be used by any one of a set of access points (e.g., restricted access points). Defining fractional reuse parameters can also involve determining to what extent these resources can be used by a set of access points (e.g., restricted access points).

In some aspects, the network node 114 may determine the parameters based on the received information, which indicates whether mutual interference in the uplink or downlink is possible and, if they exist, the degree of such interference. Such information can be received from various nodes in the system (for example, access points and / or access terminals) and in various ways (for example, through a feedback channel, through radio transmission channels, and the like).

For example, in some cases, one or more access points (eg, access point 104) may monitor the uplink and / or downlink and transmit an indication of mutual interference detected on the uplink and / or downlink to the network node 114 (eg, periodically or upon request). As an example of the previous case, the access point 104 can calculate the signal strength from the signals that it receives from adjacent access terminals that are not associated with (for example, which are not monitored) by the access point 104 (for example, access terminals 108 and 112) and transmits this as a report to network node 114.

In some cases, each of the access points in the system can generate load indicators when they encounter a relatively large load. Such indicators may take the form of, for example, an employment bit in 1xEV-DO, a relative provided channel (“RGCH” (JCH)) in 3GPP (3rd Generation Partnership Project), or some other appropriate form. In a typical scenario, the access point may transmit this information to its associated access terminal via a downlink. However, such information can also be transmitted to network node 114 (for example, through a feedback channel).

In some cases, one or more access terminals (eg, access terminal 110) may monitor downlink signals and provide information based on this tracking. Access terminal 110 may transmit such information to access point 104 (for example, which may further transmit information to network node 114), or to network node 114 (via access point 104). Other access terminals in the system may transmit information to network node 114 in a similar manner.

In some cases, the access terminal 110 may generate reports of measurement results (e.g., on a periodic basis). In some aspects, such a measurement report may indicate from which access points the access terminal 110 receives signals, strengths of received signals associated with signals from each access point (eg, Ec / Io), transmission line loss for each of the access points or some other relevant types of information. In some cases, the measurement report may include information related to any load metrics received by the access terminal 110 through the downlink.

The network node 114 can then use the information from one or more measurement reports to determine whether the access point 104 and / or the access terminal 110 is relatively close to another node (eg, another access point or access terminal). In addition, the network node 114 may use this information to determine if any of these nodes interferes with any other of these nodes. For example, the network node 114 may determine the strength of the received signal in the node based on the transmit power of the node that transmits the signals and the path loss between these nodes.

In some cases, the access terminal 110 may generate information that denotes a signal-to-noise ratio (e.g., signal to noise ratio, SINR (SINR)) in the downlink. Such information may include, for example, a channel quality indicator (“CQI” (PAC)), a data rate control indicator (“DRC”), or some other relevant information. In some cases, such information may be transmitted to the access point 104, and the access point 104 may further transmit this information to the network node 114 for use in interference control operations. In some aspects, the network node 114 may use such information to determine if there is interference in the downlink, or to determine if the level of interference in the downlink is increasing or decreasing.

As will be described in more detail below, in some cases, information related to mutual interference can be used to determine how to use fractional reuse to reduce mutual interference. As one example, CQI or other relevant information can be received based on each HARQ interlace, whereby it can be determined which HARQ interlaces are associated with the lowest level of mutual interference. A similar technology can be applied to other fractional reuse technologies.

It should be understood that the network node 114 may determine the parameters in various other ways. For example, in some cases, the network node 114 may randomly select one or more parameters.

As represented by block 204, the network node 114 (e.g., a communication controller 326) transmits certain interference control parameters to the access point 104. As will be described below, in some cases, the access point 104 uses these parameters, and in some cases, the access point 104 further passes these parameters to the access terminal 110.

In some cases, the network node 114 may control the interference in the system by defining the interference control parameters used by two or more nodes (e.g., access points and / or access terminals) in the system. For example, in the case of a fractional reuse scheme, the network node 114 may transmit different (e.g., mutually exclusive) mutual interference control parameters to neighboring access points (e.g., access points that are located close enough to each other so that they can potentially create mutual interference). In a specific example, the network node 114 may assign a first HARQ interlace to access point 104 and assign a second HARQ interlace to access point 106. Thus, data transmission at one restricted access point may substantially not interfere with data transmission at another restricted access point. Similar technologies can be used for other fractional reuse schemes and for access terminals in the system.

As represented by block 206, the access point 104 (eg, the mutual interference controller 322) determines the mutual interference control parameters that it can use or can transmit to the access terminal 110. In cases where the network node 114 determines the interference control parameters for the access point 104, such a determination operation may simply include receiving said parameters and / or retrieving said parameters (for example, from a data memory).

In some cases, the access point 104 independently determines the interference control parameters. These parameters may be similar to the parameters described above with reference to block 202. In addition, in some cases, these parameters can be determined in the same way as described above in block 202. For example, access point 104 may receive information (eg, measurement reports , CQI, DRC) from access terminal 110. In addition, access point 104 may monitor the uplink and / or downlink to determine mutual interference for such a communication line. Access point 104 may also randomly select a parameter.

In some cases, the access point 104 may interact with one or more other access points to determine a mutual interference control parameter. For example, in some cases, the access point 104 may communicate with the access point 106 to determine which parameters are used by the access point 106 (and thus select other parameters), or may coordinate the use of other (eg, mutually exclusive) parameters. In some cases, the access point 104 may determine whether it can interfere with another node (for example, based on CQI feedback, which indicates that another node is using a resource) and, if so, determine its mutual interference control parameters to reduce such potential interference.

As represented by block 208, the access point 104 (e.g., communication controller 328) may transmit interference control parameters or other related information to the access terminal 110. For example, in some cases, this information may indicate how fractional reuse should be applied (e.g., which HARQ interlaces are required to be used, which spectral mask is required to be used, etc.) on the uplink or downlink between the access point 104 and the access terminal 110 . In some cases, this information may relate to power control (for example, determines the transmit power on the uplink).

As represented by blocks 210 and 212, the access point 104 may thus transmit to the access terminal 110 on the downlink or the access terminal 110 may transmit to the access point 104 on the uplink. Here, the access point 104 may use its mutual interference control parameters for downlink transmission and / or for uplink reception. Similarly, access terminal 110 may consider these mutual interference control parameters when receiving on the downlink or transmitting on the uplink.

In some embodiments, an access terminal 110 (eg, a mutual interference controller 306) may determine one or more mutual interference control parameters. Such a parameter may be used by access terminal 110 and / or may be transmitted (e.g., via communication controller 330) to access point 104 (e.g., for use during uplink operations).

Operations related to using a fractional reuse scheme that employs HARQ interlacing in uplink or downlink will be described in more detail below with reference to FIG. 4. In some aspects, system 100 may utilize time division multiplexing, whereby information can be transmitted at one or more specific time intervals. Such time intervals can take various forms, and / or they can be named using different terminology. By way of example, in various embodiments, a time interval may refer to or may be referred to as a frame, subframe, interval, transmission time interval (“TTI”), HARQ interlace, and so on. As an example, a predetermined number of time slots (eg, TTI) 1-16 may be monitored and used for downlink transmission. A similar scheme can be used to transmit data on the uplink.

Based on traffic levels and associated interference in monitored and time intervals, and based on the application of one or more of the schemes described herein, uplink or downlink transmission may be limited to a certain number of N intervals, where, for example, N = 8, which is less than than the total number of intervals M, where M equals, for example, 16. In some aspects, such a fractional reuse scheme may use HARQ alternation.

In a typical 1xEV-DO system, every fourth subframe can be assigned to each HARQ process, for example, so that HARQ retransmissions of the original transmission in subframe "n" are performed in intervals (n + 4), (n + 8), (n +12) etc. As a specific example, HARQ rotation 1 may be assigned subframes 1, 5, 9, and so on. In the event that the transmission of the original data for HARQ alternation 1 during subframe 1 fails, a negative acknowledgment signal ("NACK") may be transmitted on a complementary communication line (eg, uplink, in the case of HARQ downlink transmission). The data can then be retransmitted during subframe 5 of the same HARQ interlace 1 and, after successful transmission, receive an acknowledgment signal ("ACK") (eg, via an uplink). Similar operations can be performed using other HARQ processes in other HARQ sequences 2, 3, and 4.

In some aspects, the fractional reuse scheme may use HARQ interlacing to configure neighboring nodes (e.g., access points and / or access terminals), for transmission at different points in time. For example, the first access point may transmit during HARQ interlaces 1 and 2, while the second access point may transmit HARQ during interlaces 3 and 4. As a result, it is possible to reduce mutual interference, which otherwise could occur between nodes.

As represented by block 402 in FIG. 4, the network node 114 (for example, the HARQ control component 338 of the mutual interference controller 320) determines how many HARQ interlaces can be used at each access point (for example, in a set of restricted access points). For example, a certain number of “N” HARQ interlaces smaller than the total number “M” of HARQ interlaces associated for this set can be determined based on feedback relating to mutual interference from one or more access points and / or access terminals in system (for example, as described above with reference to Fig. 2). Thus, at any time, the number N of downward (or upstream) HARQ interlaces from the total number of M HARQ interlaces can be determined based on activity in the downlink (or uplink) in neighboring nodes from the M HARQ interlaces.

N may be a fixed value or may be determined dynamically. In the case where M = 4, N can be set dynamically between the minimum value of Nmin, which is greater than zero, and the maximum value of Nmax, which is less than 4. In some cases, the value of N can be determined randomly. Typically, however, the value of N can be selected in an attempt to more effectively reduce mutual interference between nodes in the system. The determination of the value of N may be based on various criteria.

For example, one criterion may relate to how access points are used in the system (for example, the total number of access points, the density of access points within a given area, the relative proximity of access points, and so on). Here, if there are a large number of nodes that are close to each other, you can use a smaller value of N so that neighboring nodes are less likely to use the same HARQ interlaces. Conversely, if there is a small number of nodes in the system, a larger value of N can be determined to improve communication characteristics (for example, throughput).

Another criterion may relate to traffic (for example, the amount of traffic, types of traffic, quality of service requirements for traffic) processed by access points. For example, some types of traffic may be more sensitive to mutual interference than other types of traffic. In this case, you can use a lower value of N. In addition, some types of traffic can establish more stringent bandwidth requirements (but have a lower sensitivity to mutual interference), resulting in a higher value of N.

In some cases, the network node 114 may determine the value of N based on the received information related to mutual interference (for example, as described with reference to Fig. 2). For example, the number of access points heard by a given access terminal and the relative proximity of access points to the access terminal can be determined based on measurement reports received from the access terminal. Thus, the network node 114 can determine whether the transmission in a given cell (for example, by a limited access point or its associated access terminals) for neighboring cells can cause mutual interference and determine the number N accordingly.

Network node 114 may also determine the number N based on mutual interference information received from one or more access points (for example, as described with reference to FIG. 2). For example, if the interference value is large, a lower value of N can be determined. Thus, the number of HARQ interlaces used by a given access point can be reduced, thereby reducing the likelihood of mutual interference for each set of N HARQ interlaces from the total number M HARQ interlaces.

As represented by block 404, in some cases, the network node 114 may determine certain HARQ interlaces to be used by particular access points. For example, network node 114 may determine the amount of interference that may be visible for each of the M HARQ interlaces for a given access point, and assign HARQ interlaces having a lower interference value for that access point. In a specific example, the network node 114 may determine that downlink data transmission by the access point 106 over the two HARQ interlaces (eg, interlaces 3 and 4) that it uses may interfere with reception at the access terminals associated with the access point 104 . This can be determined, for example, based on information related to downlink interference that the network node may request, as described herein. Network node 114 may then assign HARQ interlaces 1 and 2 for use by access point 104.

As noted above, the determination of mutual interference for each HARQ interlace can be based on the signals received by the network node 114. For example, the probability of mutual interference between nodes can be determined based on one or more measurement reports received from one or more access terminals, as described here. In addition, for a downlink, the access terminals in the system can generate a channel quality indicator (“CQI”) or data rate control information (“DRC”) for each HARQ interlace (eg, for each TTI in 3GPP) and transmit this information further to the network node 114. Also for the downlink, the access terminal can monitor the downlink and provide information related to mutual interference for each HARQ interlace (for example, for each TTI). Similarly, for the uplink, the access terminal can monitor the uplink and provide information related to mutual interference based on each HARQ interlace (for example, for each TTI). In some cases (eg, DRC feedback in 3GPP2), feedback from the access terminal may not provide permission for each HARQ interlace. In this case, ACK / NACK feedback or some other types of feedback can be used to identify the desired set of HARQ interlaces. In another example, the downlink data rate can be adjusted for a given HARQ interlace to determine the data rate at which the access terminal can successfully decode data (for example, with a given accuracy). Based on the best data rate determined for each HARQ interlace, an assumption can be made as to which HARQ interlace will provide the best performance for a given access point. Alternatively, a centralized HARQ interlace selection scheme may be used (for example, in the case where a network node assigns HARQ interlace to neighboring nodes, as described here).

In some aspects, the assignment of certain HARQ interlaces to the network node 114 may depend on whether the corresponding traffic on the uplink or downlink is synchronized. Such synchronization can be achieved, for example, using adjustments such as Tau-DPCH (where Tau-VFC) (where DPCH refers to a dedicated physical channel), or some other appropriate synchronization scheme.

In some aspects, the network node 114 may assign consecutive HARQ interlaces for specific access points. Thus, in the case where traffic on the uplink or downlink of various nodes is not synchronized, at least the portion of the allocated HARQ interlaces may not be affected by mutual interference. As an example, if 1-4 HARQ alternations are assigned to the first access point and 5-8 HARQ alternations are assigned to the second access point, these access points will not be interfered with from another access point in at least three HARQ interlaces, even if the time sequence of access points will not be synchronized.

As represented by block 406, the network node 114 then transmits the HARQ interlace parameters that it has determined to one or more access points. For example, a network node 114 may transmit a node-specific assignment to each access point, or a network node 114 may transmit a general purpose to all access points from a set of access points.

As represented by block 408, the access point 104 (eg, the HARQ control component 340 of the mutual interference controller 322) determines the HARQ interlace that it will use to transmit data on the uplink or downlink. Here, the access point 104 takes the value N of the network node 114. In the case where the network node 114 assigns HARQ interlaces to be used by the access point 104, the access point 104 can simply use these HARQ interlaces. In some cases, the access point 104 may randomly select a parameter.

If the HARQ interlaces are not assigned by the network node 114 or randomly selected, the access point 104 may determine which of the N HARQ interlaces to use based on the relevant criteria. Initially, such a determination is thus based on (for example, limited) the value of N. In some cases, the access point 104 may determine or adapt N (for example, based on the criteria described above).

In some cases, access point 104 may select HARQ interlaces associated with the lowest interference level. Here, access point 104 may determine which of the HARQ interlaces should be used, similar to that described above. For example, access point 104 may receive information (eg, measurement reports, CQI, DRC) from access terminal 110. In addition, the access point 104 may monitor the uplink and / or downlink to determine the level of mutual interference on such a communication line. For example, when the access point 104 is in a standby state, it can track uplink interference (load) originating from sources outside the cell. Thus, the access point 104 can select HARQ interlaces that provide minimal interference from sources outside the cell.

In some cases, the access point 104 may interact with one or more other access points to determine the HARQ interlaces that it will use. For example, access point 104 and access point 106 may coordinate the use of different (eg, mutually exclusive) HARQ interlaces.

As represented by block 410, the access point 104 may determine a time offset for using downlink or uplink transmission. For example, the access point 104 may constantly monitor the communication line for a certain period of time to approximately determine when a neighboring node starts and ends its transmissions. Thus, the access point 104 can determine (eg, evaluate) the time characteristics of the time slots of the neighboring node. The access point can then synchronize the time characteristics of the time slots of its uplink or downlink over this time. In some aspects, this may involve defining a Tau-DPCH parameter.

In some cases (eg, 3GPP), access points can synchronize their time characteristics (eg, time characteristics of the HS-PDSCH) using the time alignment of their P-CCPCH (P-OFCU, primary common physical control channels). Such synchronization can be achieved, for example, by using GPS components (GPS, global navigation system) at each access point, time synchronization signals between access points (which can be relatively effective for neighboring access points, for example, tens of meters apart from a friend), or some other technology.

In some cases (for example, in HSDPA (HSDPA, High Speed Downlink Packet)), the overhead level may be relatively large and non-orthogonal to traffic. Here you can use intermittent transmission or reception (DTX or DRX), as a result of which overhead data will not be transmitted during the DTX / DRX period. In such cases, the transmission for CCPCH and EHICH can be accounted for and access terminals can be configured to take into account the low Ec / Io measurements in CPICH that they can see from access points using DTX / DRX.

As represented by block 412, the access point 104 may transmit a message to the associated access terminal to inform the access terminal which HARQ interlaces are required to be used for uplink or downlink. In some embodiments, the access point 104 may use an E-AGCH (Enhanced Absolute Channel Allocation) or some other similar mechanism to transmit HARQ interlace assignments to its associated access terminals. For example, access point 104 may set Xags = 1 to indicate which TTIs (IPT, Transmit Terminal Identification) should use the access terminal. In addition, the access point 104 may transmit a time offset metric (eg, Tau-DPCH) determined in block 410 to the access terminal. Thus, the access point can schedule data transmission (uplink or downlink) for the best N HARQ interlaces among the available M HARQ interlaces (block 414).

The parameters of the HARQ interlaces (for example, N and the specific HARQ interlaces used by this node) described above can be adjusted over time. For example, the information described above can be collected periodically, and the parameters can be adjusted accordingly (for example, using hysteresis and / or slow filtering, if necessary). Thus, HARQ interlaces can be used in view of the current interference conditions in the system.

In some embodiments, performing HARQ interlaces can be allocated in a hierarchical manner. For example, if no access points are deployed in the service area of the macro access point, a complete set of HARQ interlaces (for example, 8) can be allocated for the macro access point. In the case of restricted access points that are deployed in the service area of the macro access point, however, one part of the HARQ interlaces (e.g. 5) can be allocated for the macro access area, and another part of the HARQ interlaces (e.g. 3) can be allocated for points with limited access. HARQ interlaces allocated to restricted access points can then be assigned to restricted access points (eg, N = 1), as described above. The number of HARQ interlaces allocated in this way can be determined (for example, in a fixed way or dynamically adjusted) based on various criteria, as described here (for example, the use of points with limited access, traffic, interference, etc.). For example, as the number of points of limited access in the system or the amount of traffic in points of limited access increases, the number of HARQ interlaces allocated to these access points may increase.

Let us now consider FIG. 5 and 6, which will describe in more detail the operations related to the use of the circuit to change the transmit power (for example, the transmit power on the downlink), over time, to reduce mutual interference. In some aspects, such schemes include determining a transmit power profile, such as profile 602 shown in FIG. 6, which determines various power levels over time. Such a profile can take various forms and can be defined in various ways. For example, in some cases, the profile may contain a set of values that determine the transmit power for different time points. In some cases, the profile can be determined using an equation (for example, a sinusoidal waveform). In some aspects, the profile may be periodic. As shown in FIG. 6, the maximum value (MAX), the minimum value (MIN), and the period 604 can be determined for the profile.

The transmit power profile can be used to control the transmit power in various ways. For example, in some cases, the transmit power profile is used to control the total transmit power. In some embodiments, channels for transmitting overhead data (e.g., CPICH, etc.) and dedicated channels may operate with constant power. The remaining power according to the transmit power profile can then be divided between other channels (e.g., HS-SCCH and HS-PDSCH). In some embodiments, overhead channels can be scaled.

As described in more detail below, in some aspects, fractional reuse based on transmission power can be achieved by using a transmission power profile. For example, neighboring access points can use the same profile (or a similar profile), but can do this based on different phases of the profile. For example, the first access point may transmit in accordance with the profile shown in FIG. 6, while the second access point can transmit using the same profile shifted 180 degrees. Thus, when the first access point transmits with maximum power, the second access point can transmit with minimum power.

As represented by block 502 in FIG. 5, the network node 114 (for example, the profile management component 342 of the mutual interference controller 320) determines (for example, indicates) information about the transmit power profile to be used for wireless communication (for example, downlink). Such information may include, for example, parameters such as transmit power profile, initial minimum and maximum values, and an initial period value.

In some cases, one or more of these parameters may be predetermined or may be determined randomly. However, as a rule, these parameters are chosen in an attempt to more effectively reduce mutual interference between nodes in the system. The definition of this information may be based on various criteria, such as, for example, one or more measurement reports from one or more access terminals, one or more reports from one or more access points in relation to CQIs transmitted by the report by one or more associated terminals access, the number of active access terminals, and average downlink traffic at each access point (for example, in each cell).

As a specific example, the determination of the transmission power profile parameter can be based on how the access points are deployed in the system (for example, the total number of access points, the density of access points within a given area, the relative proximity of access points, and so on). Here, if there are a large number of nodes that are close to each other, the parameters can be determined so that neighboring nodes are less likely to transmit with high power at the same time. By way of example, a transmit power profile can be formed such that a given access point can transmit at approximately maximum power for a relatively short period of time. Thus, the transmission power profile can provide adequate isolation when a large number of phase values (e.g. 60 degrees, 120 degrees, etc.) are used by various nodes in the system in conjunction with the transmission power profile. Conversely, if there are a small number of nodes in the system, parameters can be defined to improve communication characteristics (for example, throughput). By way of example, a transmit power profile can be formed such that a given access point can transmit at approximately maximum power over a longer period of time.

Different levels of isolation between adjacent access points (e.g. cells) can also be achieved by adjusting the minimum and maximum parameters. For example, a greater maximum to minimum ratio provides better isolation due to longer periods of time when the access terminal transmits at a lower power level.

The transmit power profile parameter can be determined based on traffic (for example, traffic load, traffic types, quality requirements for traffic services) processed by access points. For example, some types of traffic may be more sensitive to mutual interference than other types of traffic. In this case, you can use a parameter (for example, the transmission power profile or the ratio of the maximum to the minimum value), which provides higher isolation (for example, as described above). In addition, some types of traffic may have more stringent bandwidth requirements (but less sensitivity to interference), resulting in the use of a transmission power profile that provides more transmissions with higher power levels (for example, as described above )

In some cases, the network node 114 may determine transmission power profile parameters based on received information related to mutual interference (for example, feedback from one or more access points and / or access terminals in the system, as described above with reference to Fig. 2) . For example, the number of access points heard by this access terminal and the relative proximity of these access points to the access terminal can be determined based on measurement reports received from the access terminal. Thus, the network node 114 can determine whether transmissions in a given cell (eg, associated with a restricted access point) can interfere with a neighboring cell and adjust the power profile parameters accordingly. Network node 114 may also determine parameters based on mutual interference information received from one or more access points (for example, as described with reference to FIG. 2).

In some embodiments, a period parameter can be determined based on a trade-off between any of the sensitivity to application data delay (e.g., VoIP, voice over Internet) and CQI / DRC filtering / delay (e.g., the delay from the moment the SINR is measured until the time when the result becomes effective in the traffic scheduler for the access point). For example, if the cells handle large volumes of VoIP traffic, the period can be set to match the frequency of VoIP packets. In some cases, a period in the range of 50-100 ms may be appropriate. In some embodiments, a period parameter may be determined based on the number of access terminals served.

As represented by block 504, in some cases, the network node 114 may determine a specific phase offset value that needs to be used at specific access points. For example, network node 114 may determine the amount of interference that can be seen at a given access point when it uses different phase offsets (for example, based on CQI reports received for each TTI). The phase offset associated with the lowest interference level at this access point can then be assigned to this access point.

Network node 114 may also assign phase offset values to neighboring nodes in such a way as to reduce interference between nodes. As a specific example, the network node 114 may determine that the downlink transmission by the access point 106 may interfere with reception at the access terminal associated with the access point 104. This may be determined, for example, based on information related to mutual interference in the downlink that the network node 114 may request, as described here. The network node 114 may then assign different (e.g., 180 degree phase offset) phase offset values for access points 104 and 106.

As represented by block 506, the network node 114 then transmits the power profile information that it has determined for one or more access points. Here, the network node 114 may transmit the assignment specific to the node at each access point, or the network node 114 may transmit the general purpose to all access points in the set of access points.

As represented by blocks 508 and 510, the access point 104 (for example, the profile control component 344 of the mutual interference controller 322) determines the transmission power profile parameters that it will use for downlink data transmission. In the case where the network node 114 has assigned all the parameters of the transmit power profile to be used by the access point 104, the access point 104 can simply use these parameters. In some cases, the access point 104 may randomly select a parameter (e.g., phase shift).

If all parameters are not assigned by the network node 114 or are randomly selected, the access point 104 can determine which parameters should be used based on relevant criteria. Typically, the access point may implement a tracking algorithm to dynamically determine the phase offset value, for use in conjunction with the transmit power profile, minimum, maximum, and period parameters of the access point 104 received from the network node 114.

In some cases, the access point 104 may select a phase offset value that is associated with the least interference. Here, access point 104 may determine which phase offset value is to be used, similar to that described above. For example, at block 508, the access point 104 may receive information (eg, measurement reports, CQT, DRC) from the access terminal 110, and / or the access point 104 may monitor the communication line to determine mutual interference in the communication line. As an example, in the latter case, when the access point 104 is in an idle state, it can track mutual interference (load) coming from outside the cell on the downlink. Thus, the access point 104 can select a phase offset value that provides a minimum level of mutual interference coming from sources located outside the cell in block 510.

In some cases, the access point 104 may interact with one or more other access points to determine a phase offset value. For example, the access point 104 and the access point 106 may coordinate the use of different (e.g., out of phase) phase offset values. In this case, the operations of block 508 may not be performed.

As represented by block 512, the access point performs downlink transmission based on the current transmit power profile. Thus, the transmit power can change over time so that mutual interference with neighboring nodes can be reduced.

The transmission power profile parameters (e.g., maximum, minimum, and period parameters determined by network node 114) described above can be adjusted over time. For example, the information described above can be collected on a periodic basis, and the parameters can be adjusted in accordance with this (for example, with hysteresis and / or slow filtering, if necessary). Thus, the transmit power of the access terminals in the system can be controlled to take into account various conditions of mutual interference in the system. For example, if mutual interference increases at a particular node (for example, as determined by the CQI report), the maximum power parameters may be reduced. In the simplified case, maximum_i is set to minimum_i for each access point_i. Network node 114 may then try to set these values so as to provide the same (or substantially the same) average CQI in each cell that can be achieved using the Ec_i, j / Io measurement in each access terminal terminal_i from each point access point_i.

Let us now consider FIG. 7 and 8, operations related to using the circuit to change reception attenuation (e.g., uplink attenuation) over time to reduce mutual interference will be described in detail here. In some aspects, such a scheme includes determining a reception attenuation profile, such as the 802 profile shown in FIG. 8, which determines various levels of attenuation over time. Such a profile can take various forms and can be defined in various ways. For example, in some cases, the profile may contain a set of values that determine the attenuation at reception for different points in time. In some cases, the profile can be determined using an equation (for example, a sinusoidal waveform). As shown in FIG. 8, a maximum value (MAX), a minimum value (MIN), and a period of 804 can be defined for the profile.

As described in more detail below, in some aspects, fractional reuse based on reception attenuation can be achieved by using a reception attenuation profile. For example, neighboring access points can use the same profile (or a similar profile), but operate on the basis of different phases of the profile. For example, the first access point may receive in accordance with the profile shown in FIG. 8, while the second access point can receive using the same profile with a 180 degree shift. Thus, when the first access point receives with maximum attenuation, the second access point can receive with minimum attenuation.

As shown in block 702 of FIG. 7, the network node 114 (for example, the profile component 342 of the mutual interference controller 320) determines reception attenuation profile information used for wireless reception (for example, via an uplink). Such information may include, for example, parameters, such as a reception attenuation profile, initial minimum and maximum values, and an initial period value.

In some cases, one or more of these parameters may be predetermined or may be determined randomly. Typically, however, these parameters are chosen in an attempt to more effectively reduce mutual interference between nodes in the system. The definition of this information may be based on various criteria, such as, for example, one or more measurement reports from one or more access terminals, one or more reports from one or more access points regarding CQIs transmitted in reports by one or more associated terminals access, the number of active access terminals, and average traffic on the uplink at each access point (for example, in each cell).

In a specific example, the determination of the reception attenuation profile parameter can be based on how access points are deployed in the system (for example, the total number of access points, the density of access points within a given area, the relative proximity of access points, and so on). Here, if there are a large number of nodes that are close to each other, the parameters can be determined so that neighboring nodes are less likely to perform high-level attenuation at the same time. As an example, the reception attenuation profile can be formed in such a way that a given access point can receive at a level close to the maximum attenuation level in a relatively short period of time. Thus, the attenuation profile at reception can provide adequate isolation when a large number of phase values (e.g. 60 degrees, 120 degrees, etc.) are used by various nodes in the system in conjunction with the attenuation profile at reception. Conversely, if there is a small number of nodes in the system, parameters can be defined to improve performance during data transfer (for example, throughput). As an example, a reception attenuation profile may be formed so that a predetermined access point can receive at or near the maximum attenuation level over a longer period of time.

Different levels of isolation between neighboring access points (e.g. cells) can also be achieved by adjusting the values of both the minimum and maximum parameters. For example, a larger ratio of maximum and minimum values provides better isolation due to longer periods of time when the access terminal receives at a lower level of attenuation.

The reception attenuation profile parameter can be determined based on traffic (eg, traffic load, traffic types, traffic service quality requirements) processed by access points. For example, some types of traffic may be more sensitive to mutual interference than other types of traffic. In this case, you can use a parameter (for example, the reception attenuation profile or the ratio of maximum and minimum values), which provides higher isolation (for example, as described above). In addition, some types of traffic may have more stringent bandwidth requirements (but may be less sensitive to mutual interference), whereby a reception attenuation profile can be used that provides more transmissions at higher attenuation levels (e.g., as described above).

In some cases, the network node 114 may determine reception attenuation profile parameters based on received information related to mutual interference (for example, feedback from one or more access points and / or access terminals in the system, as described above with reference to Fig. 2 ) For example, the number of access points heard by a given access terminal and the relative proximity of these access points to the access terminal can be determined based on measurement reports received from the access terminal. Thus, the network node 114 can determine whether transmissions in a particular cell (eg, associated with a restricted access point) can interfere with a neighboring cell and adjust the attenuation profile parameters accordingly. Network node 114 may also determine parameters based on mutual interference information received from one or more access points (for example, as described with reference to FIG. 2).

In some embodiments, the period parameters may be determined based on a trade-off between any of the delay sensitivity of the application data (e.g., VoIP) and filtering / delay in the downlink control channel (e.g., CQI / DRC, ACK channel, etc.) as described above.

As presented in block 704, in some cases, the network node 114 may determine the specific phase offset values and / or other parameters described above, which should be used at specific access points. For example, network node 114 may determine the amount of interference that may be visible at a given access point when it uses different phase offsets. The phase offset associated with the lowest level of mutual interference at this access point can then be assigned to this access point.

The network node 114 may also assign phase offset values to neighboring nodes so as to reduce interference between nodes. As a specific example, network node 114 may determine that uplink data transmission by access terminal 112 may interfere with reception at access point 104. This can be determined, for example, based on information related to mutual interference in the uplink, which the network node 114 may request, as described here. Network node 114 may then assign different (e.g., 180 degrees, phase differences) phase offset values for access points 104 and 106.

As represented by block 706, the network node 114 then transmits the attenuation profile information that it has determined at one or more access points. Here, the network node 114 may transmit a node-specific assignment for each access point, or the network node 114 may transmit a general purpose for all access points in the set of access points.

As represented by blocks 708 and 710, the access point 104 (for example, the profile component 344 of the mutual interference controller 322) determines the reception attenuation profile parameters that it will use to transmit data on the uplink. In the case where the network node 114 assigns all the reception attenuation profile parameters to be used at the access point 104, the access point 104 can simply use these parameters. In some cases, the access point 104 may randomly select a parameter (eg, phase shift).

If all parameters have not been assigned by the network node 114 or randomly selected, the access point 104 may determine which parameters should be used based on the relevant criteria. Typically, the access point may implement a tracking algorithm to dynamically determine the phase offset value to be used in conjunction with the attenuation profile at the reception, minimum, maximum, and period parameters that the access point 104 received from network node 114.

In some cases, the access point 104 may select a phase offset value that is associated with the lowest level of mutual interference. Here, access point 104 may determine which phase offset value to use, similar to that described above. For example, at block 708, the access point 104 may receive information (eg, measurement reports) from the access terminal 110, and / or the access point 104 may monitor the communication line to determine mutual interference in the communication line. As an example, in the latter case, when the access point 104 is inoperative, it can track the level of mutual interference (load) coming from a source located outside the cell, on the uplink. Thus, the access point 104 may select a phase offset value that provides minimal interference from a source outside the cell in block 710.

In some cases, the access point 104 may interact with one or more other access points to determine a phase offset value. For example, the access point 104 and the access point 106 may coordinate the use of different (e.g., out of phase) phase offset values. In this case, operations in block 708 may not be performed.

As presented in block 712, the access point performs uplink reception based on the current reception attenuation profile (for example, by applying the attenuation profile to received signals). Thus, the attenuation at reception can change over time so that it can reduce mutual interference with neighboring nodes.

The reception attenuation profile parameters described above (e.g., maximum, minimum, and period parameters determined by network node 114) can be adjusted over time. For example, the information described above can be collected on a periodic basis, and the parameters can be adjusted accordingly (for example, with hysteresis and / or slow filtering, if required). Thus, attenuation upon reception of access terminals in the system can be controlled so as to take into account the current conditions of mutual interference in the system. For example, the amount of attenuation (for example, maximum attenuation) can be increased by increasing the power level of the received signal at one or more access points. In the simplified case, maximum_i is set equal to minimum_i for each access point_i and is controlled in the same way as described above.

Below, with reference to FIG. 9 and 10, operations related to using a fractional reuse scheme in which selective transmission (eg, puncturing) via an uplink or downlink will be described in more detail. As noted above, the system may transmit for one or more specific time slots, which in various embodiments may refer to or may be referred to a frame, subframe, slot, transmit time interval ("TTI"), HARQ interlace, and so on. .

In some aspects, a fractional reuse scheme may involve configuring neighboring nodes (eg, access points and / or access terminals) to prevent transmission of one or more transmission time intervals during a portion. For example, the first access point may transmit during the first section (e.g., part or all of a subframe) of the time interval, while the second access point will transmit during the second section (e.g., another part of the subframe or a completely different subframe) of the time interval. As a result, interference that would otherwise occur between nodes can be reduced.

In some aspects, determining whether a node should refrain from transmitting during a certain part of the time interval may include determining how much interference levels are present in different parts of the time interval. For example, a node may refrain from transmitting in those parts of a time slot that are associated with higher mutual interference.

First, consider FIG. 9, which is shown in block 902 as a network node 114 (for example, a time slot control component 346 of a mutual interference controller 320) or some other appropriate object that can determine how a given transmission time interval or a set of transmission time intervals should be divided into sections so so that different nodes can selectively refrain from transmitting during one or more of these sections of time intervals. This may include, for example, determining parameters such as the structure of each section of the time interval, the number of sections of the time interval, the size of each section of the time interval, and the location of each section of the time interval. It should be understood here that a given portion of a time interval can be defined so that it will include sub-sections that are not continuous in time or can be defined as one continuous period of time. In some cases, these time slot parameters may be predetermined for the system.

In some aspects, the parameters of the time slot sections are defined so as to reduce interference in the system. To this end, sections of the time interval can be determined based on how the nodes are deployed in the system (for example, the total number of access points, the density of access points within a given area, the relative proximity of access points, and so on). Here, if there are a large number of nodes deployed in a given area, more plots of time intervals (for example, and possibly smaller plots) can be determined, and / or more partitions can be provided between plots of the time interval. Thus, neighboring nodes are less likely to use the same portion of the time slot (or interfere with the adjacent portion of the slot), and any nodes potentially causing temporary interference can thus be designed so that they will not transmit time of a larger percentage of a time interval or set of time intervals. Conversely, if there are fewer nodes in the system, fewer sections of the time interval (for example, and possibly larger sections with less separation) can be determined to improve communication characteristics (for example, throughput).

Sections of the time interval can also be determined based on traffic (for example, the amount of traffic, types of traffic, quality requirements for the service making up the traffic) processed by access points. For example, some types of traffic may be more sensitive to mutual interference than other types of traffic. In such a case, a larger number of sections of the time interval may be determined, and / or more divisions may be provided between the sections of the time interval. In addition, some types of traffic may have more stringent bandwidth requirements (but may be less sensitive to mutual interference), as a result of which large portions of the time interval can be determined.

Plots of the time interval can also be determined based on mutual interference in the system. For example, if the mutual interference values in the system are high, large sections of the time interval may be determined, and / or more partitions may be provided between sections of the time interval.

The operations of block 902 may therefore be based on feedback relating to mutual interference from one or more access points and / or access terminals in the system (eg, as described above). For example, measurement reports in the access terminal and / or reports from access nodes can be used to determine the extent to which nodes in the system can interfere with each other.

As represented by block 904, in some cases, the network node 114 may indicate certain portions of a time slot to be used by certain nodes. In some cases, sections of the time interval may be assigned randomly. However, as a rule, sections of the time interval can be selected when trying to reduce mutual interference between nodes in the system. In some aspects, determining which portion of a time interval a given node should use can be performed similarly to the operations of block 902 described above. For example, network node 114 may determine the amount of interference that is associated with portions of a time slot.

For a downlink, the access point may initially be configured to use a first portion of a time slot. The mutual interference associated with using this portion of the time interval can then be determined (for example, based on CQI reports collected over a specific period of time). The access point may then be configured to use a second portion of the time slot. Mutual interference associated with the use of the second portion of the time interval can then be determined (for example, based on CQI reports collected over a certain period of time). The network controller may then designate for the access point a portion of the time interval associated with the lowest level of mutual interference.

For the uplink, the access terminal may be configured to initially use the first portion of the time interval. Mutual interference associated with the use of this portion of the time interval, for example, can be determined indirectly based on the transmission power values (for example, automatically determined by the power control commands from the corresponding access point) used in uplink transmission over a period of time. The access terminal may then be configured to use a second portion of the time slot. Mutual interference associated with the use of the second portion of the time interval can then be determined (for example, as described above). The network node 114 may then designate the portion of the time slot associated with the lowest mutual interference (for example, as indicated by the lowest transmit power level on the uplink) for this access terminal and its associated access point.

Network node 114 may also designate time slots for neighboring nodes so as to reduce the level of mutual interference between nodes. As a specific example, network node 114 may determine that downlink transmission with access point 106 may interfere with reception at the access terminal associated with access point 104. This can be determined, for example, on the basis of information related to mutual interference in the downlink, which the network node 114 may receive, as described here. To reduce this possible level of mutual interference, the network node 114 may designate other portions of the time slot for access points 104 and 106.

As represented by block 906, the network node 114 may determine a time offset for one or more access points to synchronize the time parameters of the time interval of the access points. Such synchronization can be achieved, for example, by using adjustments such as Tau-DPCH (where DPCH refers to a dedicated physical channel), or for some other appropriate synchronization scheme.

As represented by block 908, the network node 114 then transmits the parameters of the time slot portion that it defines for one or more access points. For example, a network node 114 may transmit a node-specific assignment to each of the access points, or a network node 114 may transmit a general purpose for all access points in a set of access points. Network node 114 may also transmit one or more time offset metrics for access points for use in synchronization operations.

As shown in FIG. 10, such a flowchart describes operations that may be performed by an access point for operations performed on a downlink or an access terminal for operations performed on an uplink. First, consider the downlink case.

As represented by block 1002, the access point 104 (eg, the time slot control component 348 of the mutual interference controller 322) determines the portion of the time interval that it will use to transmit data on the downlink. If the network node 114 has assigned a portion of the time interval for use by the access point 104, the access point 104 may simply use these portions of the time interval. In some cases, the access point 104 may randomly choose which of the time slot portion to use.

If the time slot portion has not been assigned by the network node 114 or is randomly selected, the access point 104 may determine which portion of the time slot should be used based on the relevant criteria. In some aspects, access point 104 may select a portion of the time slot associated with the lowest interference level. Here, access point 104 may determine which portion of the time slot should be used, similar to that described above in block 904 (for example, by using different portions at different time periods and tracking CQI or some other parameter for each time period).

In some cases, the access point 104 may interact with one or more other access points to determine which portion of the time interval should be used. For example, access point 104 and access point 106 may coordinate the use of different (eg, mutually exclusive) portions of a time interval.

As represented by block 1004, access point 104 may determine a time offset for use in downlink data transmission. For example, access point 104 may continuously monitor a communication line for a specific period of time to approximately determine when a neighboring node begins and ends its transmissions. Thus, the access point 104 can determine (eg, evaluate) the time characteristics of a portion of a time interval of a neighboring node. The access point may then synchronize a portion of the time parameters of its downlink time slot with these times. In some aspects, this may require the definition of a Tau-DPCH parameter.

As represented by block 1006, the access point 104 may transmit a message (eg, including time offset information) to the associated access terminal to inform the access terminal which portions of the time slot to use for the downlink. Thus, the access point 104 can schedule downlink transmissions over the most accessible portions of the time interval (block 1008).

Returning now to the uplink scenario, as represented by block 1002, the access terminal 104 (eg, mutual interference controller 324) determines the portions of a time slot that it will use to transmit data on the uplink. In the case where the network node 114 has assigned portions of the time interval for use by the access terminal 110, the access terminal 110 may simply use these portions of the time interval. In some cases, the access terminal 110 may randomly select which portion of the time slot should be used.

If the time slot portions have not been assigned by the network node 114 or are randomly selected, the access terminal 110 may determine which portion of the time slot to use based on the relevant criteria. In some aspects, the access terminal 110 may select a portion of the time slot associated with the lowest level of mutual interference (e.g., the lowest transmit power). Here, the access terminal 110 may determine which portion of the time interval should be used, similar to that described above, in block 904, or this may occur automatically as a result of performing the power control operation on the access point 104.

In some cases, the access point 104 may track uplink interference during tests of a time slot portion (eg, a test to determine which portion of a time slot has the lowest level of interference). In such cases, the access point 104 may instruct the access terminal 110 to use certain portions of the time interval during this phase of the interference test. Alternatively, the access terminal 110 may report to the access point 104 which portions of the time slot are used in this phase of the test.

In some cases, the access point 104 may interact with one or more other access points to determine which portion of the uplink time slot should be used. For example, access point 104 and access point 106 may coordinate the use of different (eg, mutually exclusive) portions of a time slot. In this case, the access point 104 may then transmit this information to the access terminal 110.

As represented by block 1004, access terminal 110 may determine a time offset used to transmit data on the downlink or uplink. For example, access terminal 110 may continuously monitor a communication line for a certain period of time to approximately determine when a neighboring node begins and ends its transmissions. Thus, the access terminal 110 can determine (for example, evaluate) the time parameters of the time slot portion of the neighboring node. Alternatively, the access terminal 110 may receive time offset information from an access point 104 (e.g., Tau-DPCH parameter). In any case, the access terminal 110 may then synchronize a portion of the time parameters of its uplink time slot with this time.

As represented by block 1006, the access terminal 110 may transmit a message to the access point 104 to inform the access point 104 which portions of the time slot are to be used for the uplink. Thus, the access terminal 110 may schedule uplink data transmission over the best available time slot portions (block 1008).

The operations described above can be performed on a periodic basis while trying to continuously provide the best sections of the time interval for the nodes of the system. In some cases, it may be decided not to transmit the pilot sequence bits for certain times to provide a more accurate SNR estimate (SNR, signal-to-noise ratio) (for example, for EV-DO). In some cases, it may be decided not to transmit during transmission over certain overhead channels to provide better isolation (for example, for HSPA (WWTP, high-speed packet data)). In addition, conditions may be provided for the access terminals to take into account the lower signal measurement results that they can see from the access points using the scheme described above.

Next, with reference to FIG. 11 and 12, operations related to using a fractional reuse scheme in which uplink or downlink spectral masks are applied will be described in more detail. In some aspects, such a scheme may involve configuring neighboring nodes (eg, access points and / or access terminals) to use different spectral masks for transmission. Here, instead of using the entire available frequency spectrum with constant power, each node can use a spectral mask to form an inhomogeneous power spectral density. For example, the first access point can transmit using the spectral mask associated with the first set of spectral components (for example, the first subset of the selected frequency spectrum), while the second access point can transmit using another spectral mask associated with the second set of spectral components (for example , the second subset of the selected frequency spectrum). As a result, mutual interference that might otherwise occur between nodes can be reduced.

In some aspects, determining whether a node will use a given spectral mask may include determining to what extent interference is visible when various spectral masks are used. For example, the node may choose to use a spectral mask that is associated with a lower level of interference. It should be understood here that a given spectral mask can be defined so that it will include spectral components that are not continuous in frequency, or can be defined as one continuous extension of frequencies. In addition, the spectral mask may contain a positive mask (for example, defining frequency components that you want to use) or a negative mask (for example, defining frequency components that should not be used).

Turning initially to FIG. 11, as represented by block 1102, the network node 114 (for example, the spectral mask control component 350 of the spectral mask of the mutual interference controller 320) may receive information that assigns mutual interference associated with different spectral components of the frequency spectrum allocated for transmission on the downlink or uplink .

The operations of block 1102, therefore, can be based on feedback related to mutual interference from one or more access points and / or access terminals in the system (for example, as described above). For example, reports containing measurements from an access terminal and / or reports from access nodes can be used to determine the extent to which nodes in the system can interfere with each other when using this spectral mask.

As represented by block 1104, in some cases, the network node 114 may determine certain spectral masks for use by certain nodes. In some cases, spectral masks may be assigned randomly. However, as a rule, spectral masks can be selected when trying to more effectively reduce mutual interference between nodes in the system.

For example, for a downlink, the access point may initially be configured to use a first spectral mask (for example, a filter defined with specific spectral characteristics) during transmission. Such a spectral mask can be limited, for example, to essentially the first half of the selected spectrum (for example, the spectral mask has essentially spectral density with full power for half the spectrum and essentially spectral density with reduced power for the other half of the spectrum). Mutual interference associated with the use of a spectral mask can then be determined (for example, based on CQI reports collected over a period of time). The access point may then be configured to use a second spectral mask (for example, which is limited to essentially the second half of the selected spectrum). Mutual interference associated with the use of the second spectral mask can then be determined (for example, based on CQI reports collected over a period of time). Network node 114 may then assign a spectral mask associated with the least interference to the access point.

For the uplink, the access terminal may initially be configured to use a first spectral mask in transmission. Then, the interference associated with the use of a spectral mask can be determined (for example, based on uplink interference measured by the associated access terminal). The access terminal may then be configured to use a second spectral mask and may determine the mutual interference associated with the use of the second spectral mask. Network node 114 may then assign a spectral mask associated with the lowest mutual interference to the access terminal.

Network node 114 may also assign spectral masks to neighboring nodes so as to reduce interference between nodes. As a specific example, the network node 114 may determine that the downlink data transmission performed by the access point 106 may interfere with reception at the access terminal associated with the access point 104. This can be determined, for example, based on information related to downlink interference that the network node 114 may receive, as described herein. To reduce such potential mutual interference, the network node 114 may assign various spectral masks for access points 104 and 106.

As represented by block 1106, the network node 114 then transmits the spectral masks that it has identified to the corresponding access point (s). Here, the network node 114 may transmit a node-specific message to each access point, or the network node 114 may transmit a common message to all access points from the set of access points.

Let us now consider FIG. 12, this flowchart represents operations that can be performed by an access point and an associated access terminal for operations performed on the downlink and uplink. As represented by block 1202, the access point 104 (for example, the spectral mask control component 352 of the mutual interference controller 322) determines the spectral mask to be used for the uplink or downlink. In the case where the network node 114 assigns a spectral mask intended for use, the access point 104 may simply use the assigned spectral mask. In some cases, the access point 104 may randomly choose which spectral mask to use.

If the spectral mask has not been assigned by the network node 114 or is randomly selected, the access point 104 may determine which spectral mask to use based on the relevant criteria. In some aspects, access point 104 may select a spectral mask associated with the lowest level of mutual interference. For example, access point 104 may determine which spectral mask to use, similar to that described above in blocks 1102 and 1104 (for example, by using different spectral masks at different time periods and tracking CQT or some other parameter related to mutual interference, during each time period).

In some cases, the access point 104 may interact with one or more other access points to determine which spectral mask to use. For example, access point 104 and access point 106 may negotiate the use of different (eg, mutually exclusive) spectral masks.

As represented by block 1204, the access point 104 transmits a message to the access terminal 110 to inform the access terminal 110 which spectral mask to use for the uplink (or, if necessary, for the downlink). Thus, the access point 104 may perform downlink transmission using the best available spectrum, and / or the access terminal 110 may perform uplink transmission using the best available spectrum (block 1206). Here, the equalizer in the receiving node (for example, in the access terminal for the downlink) can reduce the effect of the spectral mask (in particular, if there is no load from the neighboring cell). In addition, in some cases, the equalizer may be adaptive and may take into account the specific spectral mask used in the transmission node (for example, in the access point for the downlink).

The operations described above can be performed on a periodic basis, while trying to constantly provide the best spectral masks for nodes in the system.

With reference to FIG. 13 and 14, operations related to using a fractional reuse scheme using extension codes (e.g., Walsh codes or OVSF codes) will be described. In some aspects, such a scheme may involve the execution of neighboring nodes (eg, access points), with the possibility of using different extension codes during transmission. Here, instead of using all the codes in a dedicated set of extension codes, each node can use a subset of the extension codes. For example, the first access point can transmit using the first set of extension codes, while the second access point can transmit using the second set of extension codes. As a result, interference can be reduced, which, otherwise, could occur between nodes.

In some aspects, determining whether a node will use a given extension code may include determining to what extent interference is visible when various extension codes are used. For example, the node may choose to use an extension code that is associated with a lower level of interference.

First, consider FIG. 13, as represented by block 1302, the network node 114 (for example, the extension code control component 354 of the mutual interference controller 320) may receive information that assigns mutual interference associated with various subsets of the extension codes of the set of extension codes allocated for downlink transmission.

The operation unit 1302 may therefore be based on feedback relating to mutual interference from one or more access points and / or access terminals in the system (eg, as described above). For example, reports containing the measurement results of access terminals and / or reports from access nodes can be used to determine the extent to which nodes in the system can interfere with each other when using this extension code.

As represented by block 1304, in some cases, the network node 114 may indicate certain extension codes that should be used by certain nodes. In some cases, extension codes may be assigned randomly. However, as a rule, extension codes can be selected in an attempt to more effectively reduce mutual interference between nodes in the system.

For example, the access point may initially be configured to use the first set of extension codes for downlink transmission. Mutual interference associated with the use of this set of extension codes can then be determined (for example, based on CQI reports collected over a period of time). The access point may then be configured to use a second set of extension codes, and then determine the mutual interference associated with the use of the second set of extension codes. Network node 114 may then assign an extension code associated with the lowest interference level for the access point.

Network node 114 may also assign extension codes for neighboring nodes in such a way as to reduce mutual interference between nodes. As a specific example, such a network node 114 may determine that downlink transmission by the access point 104 may interfere with reception at the access terminal associated with the access point 106. This can be determined, for example, on the basis of information related to mutual interference in the downlink, which the network node 114 may receive, as described here. To reduce such potential interference, the network node 114 may assign various extension codes to access points 104 and 106.

As represented by block 1306, the network node 114 then transmits the extension codes that it identified at the corresponding access point (s). Here, the network node 114 may transmit a node-specific message to each access point, or the network node 114 may transmit a common message to all access points from the set of access points.

As represented by block 1308, the network node 114 may also transmit one or more other sets of extension codes to the access point (s). As will be described in more detail below, these sets can identify extension codes that are not used by a given access point, and / or extension codes that are used by some other access point.

As shown in FIG. 14 in block 1402, the access point 104 (eg, the extension code control component 356 of the mutual interference controller 322) determines a set of extension codes to be used for the downlink. In the case where the network node 114 assigns a set to be used, the access point 104 may simply use the assigned set. In some cases, the access point 104 may randomly choose which set of extension codes to use.

If the set of extension codes has not been assigned by the network node 114 or is randomly selected, the access point 104 may determine which set should be used based on the relevant criteria. In some aspects, access point 104 may select a set of spreading codes associated with the lowest interference level. For example, access point 104 may determine which set should be used, similar to that described above with reference to blocks 1302 and 1304 (for example, by using different extension codes at different time periods and tracking CQT or some other parameter associated with mutual interference during each time period).

In some cases, the access point 104 may interact with one or more other access points to determine which set of extension codes should be used. For example, access point 104 and access point 106 may negotiate the use of different (eg, mutually exclusive) sets of extension codes.

As represented by block 1404, the access point 104, if necessary, can synchronize its time parameters with the time parameters of one or more other access points. For example, by achieving equalization of chips with neighboring cells (for example, associated with other restricted access points), orthogonal channels can be established between access points by using different extension codes at each access point. Such synchronization can be performed, for example, using the technologies described above (for example, access points may include GPS functions).

As represented by block 1406, the access point 104, if necessary, can determine extension codes that are used by one or more other access points. Such information can be obtained, for example, from neighboring node 114 or directly from other access nodes (for example, through a feedback channel).

As represented by block 1408, the access point 104 transmits a message to the access terminal 110 to inform the access terminal 110 which extension code should be used for the downlink. In addition, the access point 104 may transmit information to the access terminal 110, which identifies extension codes not used by the access point 104, and / or which identifies extension codes that are used by some other access point (for example, a neighboring access point).

As represented by block 1410, the access point 104 performs downlink transmission using the selected set of extension codes. In addition, as represented by block 1412, the access terminal 110 uses the extension code information transmitted by the access point 104 to decode the information it receives via the downlink.

In some embodiments, access terminal 110 may be configured to use information related to extension codes not used by access point 104 to more efficiently decode received information. For example, a signal processor 366 (e.g., one capable of compensating for mutual interference) may use these other extension codes in an attempt to compensate, based on the received information, for any mutual interference generated by signals received from another node (e.g., access point 106) that were encoded using these other extension codes. Here, the original received information is processed by using other extension codes to obtain decoded bits. The signal is then generated from the decoded bits, and this signal is subtracted from the original received information. The resulting signal is then processed using the extension codes transmitted by the access point 104 to obtain an output signal. Preferably, by using such mutual interference control technologies, relatively high levels of interference cancellation can be achieved even when the access point 104 and the access terminal 110 are not time synchronized.

The operations described above can be performed on a periodic basis in an attempt to constantly provide the best node extension codes in the system.

Let us now consider FIG. 15 and 16, operations related to using a circuit related to power control to reduce mutual interference are shown. In particular, these operations relate to controlling the transmit power of the access terminal to reduce any mutual interference that an uplink access terminal can create at an unassociated access point (for example, which operates at the same carrier frequency for an adjacent carrier frequency).

As represented by block 1502, a node (eg, network node 114 or access point 104) receives power management related signals that can be used to determine how to control the uplink transmission power of access terminal 110. In various scenarios, signals may be received from a network node 114, an access point 104, another access point (eg, access point 106) or an associated access terminal (eg, access point 110). Such information can be received in various ways (for example, through a feedback channel, over the air, etc.).

In some aspects, these received signals may provide an indication of mutual interference at a neighboring access point (eg, access point 106). For example, as described herein, access terminals associated with access point 104 may generate reports of measurement results and transmit these reports to network node 114 via access point 104.

In addition, access points in the system can generate a load metric (for example, a busy bit or relative provided channel) and transmit this information to its associated access terminal via a downlink. Thus, the access point 104 may monitor the downlink to obtain this information, or the access point 104 may request this information from its respective access terminals, which can receive this information through the downlink.

In some cases, interference information may be received from the network node 114 or from the access point 106 via the feedback channel. For example, access point 106 may transmit reports containing information about its download (eg, mutual interference level) to network node 114. Network node 114 may then distribute this information to other access points in the system. In addition, access points in the system can communicate directly with each other to inform each other about their respective boot conditions.

As represented by block 1504, a transmit power metric for access terminal 110 is determined based on the parameters described above. This metric may relate, for example, to the maximum allowed power value, the instantaneous power value, or an indicator representing the ratio of traffic to pilot sequences (T2P).

In some aspects, the maximum transmit power for access terminal 110 is determined by evaluating the interference that the access terminal 110 may induce at access point 106. Such interference can be estimated, for example, based on channel loss information obtained from measurement reports received from access terminal 110. For example, access terminal 110 may determine channel loss to access point 106 in channel loss to access point 104. Based on this information, the access point 104 can determine the power induced (for example, the amount of mutual interference) at the access point 106 based on the signal strength for the signals that the access point 104 receives from the access terminal 110. The access point 104 may thus determine the maximum allowed transmit power for the access terminal 110 based on the measurement results described above (for example, the maximum transmit power can be reduced by a certain amount).

In some aspects, an instantaneous power value may be generated to control the current transmit power of the access terminal. For example, in the case where the number of induced mutual interference is greater than or equal to the threshold value, the access terminal 110 may be instructed to reduce its transmit power (for example, by a certain amount or by a specified amount).

In some cases, the power control operation may be based on one or more parameters. For example, if the access point 104 receives a busy bit from the access point 106, the access point 104 may use the information from the measurement reports to determine if interference at the access point 106 is caused by the access terminal 110.

Let us now consider FIG. 16, in some embodiments, the transmit power metric generated in block 1504 may relate to the maximum uplink T2P ratio. In addition, in some cases, such a value may be defined as a downlink SINR function. Waveform 1602 in FIG. 16 illustrates one example of a function that correlates a SINR of a downlink with a T2P in an uplink. In this case, the application of T2P in the uplink may decrease as the SINR in the downlink decreases. Thus, uplink interference from access terminals in an unbalanced channel can be limited. As shown in the example of FIG. 16, a minimum T2P value 1604 can be determined for the access terminal so that a certain amount of minimum weight is guaranteed. In addition, a maximum value of 1606 T2P can be determined. In some aspects, the uplink T2P value allocated for each access terminal may be limited by a minimum upper power limit of the access terminal or a function based on SINR in the downlink (for example, as shown in FIG. 16). In some embodiments (eg, 3GPP), the function described above can be provided by an uplink scheduler of an access point that has access to a CQI transmitted on a feedback channel from an access terminal.

As again shown in FIG. 15 and presented in block 1506, in some embodiments, it may be allowed to increase the threshold value for exceeding the thermal noise level (“RoT”, PTS) for the access point above a normal value to control the load. For example, in some cases, a limit for the RoT threshold may not be set. In some cases, the RoT threshold may be allowed to grow to a value limited only by the uplink budget or by the saturation level at the access point. For example, the upper threshold RoT may be increased at access point 104 to a predetermined value to ensure that each associated access terminal operates at the highest T2P level allowed by its power margin.

By enabling such an increase in the threshold value of RoT, the access point can control its total received signal strength. This can be advantageous in situations where the access point is subject to high interference (for example, from a neighboring access terminal). However, in the absence of a limit value for the RoT threshold, access terminals in neighboring cells can go into a "power race" to overcome mutual interference between each other. For example, such access terminals can become saturated at their maximum transmit power level on the uplink (for example, 23 dBm) and, as a result, can cause significant interference at macro access points. To prevent such “race” conditions, the transmit power of the access terminal can be reduced by increasing the threshold value of RoT. In some cases, such “race” conditions can be avoided by using a control circuit with a maximum uplink T2P ratio (for example, as described above with reference to FIG. 16).

As represented by block 1508, a measure of the transmit power (e.g., maximum power, instantaneous power, or T2P) calculated using one or more of the technologies described above can be transmitted to access terminal 110 to control the transmit power of access terminal 110. Such a message may be transmitted directly or indirectly. As an example, in the first case, explicit signaling can be used to inform the access terminal 110 of the new maximum power value. As an example of the latter case, access point 104 may adjust T2P or may transmit a load metric from access point 106 (possibly after some modification) to access terminal 110. Access terminal 110 may then use this parameter to determine the maximum power value.

Let us now consider FIG. 17, in some embodiments, the attenuation coefficient of the signal can be adjusted to reduce interference. Such a parameter may include noise figure or attenuation. The magnitude of this filling or attenuation of the signal can be dynamically adjusted based on the strength of the signal measured by other nodes (for example, as described here) or using certain signaling messages (for example, indicating levels of mutual interference) exchanged between access points. Thus, the access point 104 can compensate for interference caused by nearby access terminals.

As represented by block 1702, access terminal 104 may receive signals related to power control (eg, as described above). As represented by blocks 1704 and 1706, the access point 104 may determine whether or not the threshold level is greater than or equal to the strength of the received signal from the associated access terminal or unassociated access terminal. Otherwise, the access point 104 continues to track signals related to power control. If so, access point 104 adjusts the attenuation coefficient in blocks 1708. For example, in response to an increase in received signal strength, access point 104 may increase its noise figure or attenuation at the receiver. As represented by block 1710, the access point 104 may transmit a transmit power control message to its respective access terminals to increase their transmit power on the uplink as a result of increasing the attenuation coefficient (for example, to overcome the noise figure or attenuation on the uplink at access point 104 )

In some aspects, access point 104 may distinguish signals received from unassociated access terminals from signals received from associated access terminals. Thus, the access terminal 104 may perform appropriate control of the transmit power of its associated access terminals. For example, various adjustments can be made in response to signals from associated, as opposed to non-associated, access terminals (for example, depending on whether there is only one associated access terminal).

In another embodiment, interference cancellation can be performed using an access point for access terminals that are not served by that access point, or for access terminals that are not in the active set of access points. To this end, scrambling codes (in WCDMA (WCDMA, code division multiple access) or in HSPA) or long user codes (in 1xEV-DO) can be shared between all access points (which receive scrambling codes from all access terminals) . Then, the access point decodes the corresponding information of the access terminal and removes the interference associated with the respective access terminals.

In some aspects, the description presented herein may be used in a network that includes macro coverage (e.g., a cellular network covering a large area, such as a 3G network, typically referred to as a macrocell network), and a smaller coverage area (e.g., in an environment network deployed in a separate living room or building). As the access terminal ("AT" (AT)) moves through such a network, the access terminal can be serviced at certain locations by the access nodes ("AN", (UD)) that provide macro service, while the access terminal can be serviced elsewhere by access nodes that provide services on a smaller scale. In some aspects, sites with a small service area can be used to provide sequential increase in throughput in the service area located inside the building and provide various services (for example, for more reliable user service). In the description given here, a node that provides a service area in a relatively large area may be called a macro node. A node that provides services in a relatively small area (for example, inside a living room) may be called a femto node. A node that provides services in an area that is smaller than the macroregion and larger than the femtoregion may be called a pico node (for example, providing services within a commercial building).

A cell associated with a macro node, a femto node, or a pico node may be called a macro cell, a femto cell, or a pico cell, respectively. In some embodiments, each cell may further be associated with (e.g., divided into) one or more sectors.

In various embodiments, different terminology may be used to refer to a macro node, femto node, or pico node. For example, a macro node can be made this way or can be named as an access node, base station, access point, eNodeB, macro cell, and so on. In addition, the femto node can be made or referred to as home node B, home eNodeB, access point base station, femtocell, and so on.

In FIG. 18 illustrates a wireless communication system 1800 configured to support multiple users in which the descriptions described herein may be embodied. System 1800 provides data transmission for multiple cells 1802, such as, for example, macrocells 1802A-1802G, each cell being served by a corresponding access node 1804 (e.g., access nodes 1804A-1804G). As shown in FIG. 18, access terminals 1806 (e.g., access terminals 1806A-1806L) may be allocated to different places in the system over time. Each access terminal 1806 may communicate with one or more access nodes 1804 on a forward link ("FL" (PC)) and / or a reverse link ("RL" (OK)) at a given time, depending on whether access terminal 1806 is active and whether, for example, is in soft transmission mode. A wireless communications system 1800 can provide services in a large geographic region. For example, macrocells 1802A-1802G may span several neighborhoods located nearby.

In FIG. 19 illustrates an example communications system 1900 where one or more femto nodes are deployed in a network environment. In particular, the system 1900 includes a plurality of femto nodes 1910 (e.g., femto nodes 1910A and 1910B) installed in a relatively small scale network environment (e.g., in one or more residential areas of a 1930 user). Each femto node 1910 can be connected to a wide area network 1940 (e.g., the Internet) and a core network 1950 of a mobile operator via a DSL router, cable modem, wireless line or other means of communication (not shown). As will be described below, each femto node 1910 can be configured to service associated access terminals 1920 (e.g., access terminal 1920A) and, if necessary, terminals 1920 intended for accessing foreign devices (e.g., access terminal 1920B). In other words, access to the femto nodes 1910 may be limited so that a given access terminal 1920 may be served by a set designated (e.g., home) femto node (s) 1910, but may not be served by any of the unassigned femto nodes 1910 (e.g., neighboring femto nodes 1910) .

In FIG. 20 illustrates an example of a service area map 2000 where several tracking areas 2002 (or routing areas or location areas) are defined, each of which includes several macro areas of the service area 2004. Here, the service area areas associated with the tracking areas 2002A, 2002B and 2002C are delimited by wide lines, and the macro-service areas 2004 are represented by hexagons. The 2002 tracking areas also include the 2006 femto area service. In this example, each of the femto service areas 2006 (e.g., the service femto area 2006C) is represented within the service macro area 2004 (e.g., the service macro area 2004B). It should be understood, however, that the femto service area 2006 may not be entirely within the macro service area 2004. In practice, a large number of femto service areas 2006 can be defined with a given tracking area 2002 or macro service area 2004. In addition, one or more pico-service areas (not shown) can be defined within a given tracking area 2002 or macro-service area 2004.

Consider again FIG. 19, where the owner of the femto node 1910 can subscribe to a mobile service, such as, for example, a 3G mobile service offered through a mobile operator’s core network 1950. In addition, the access terminal 1920 can be configured to operate both in macro environments and in smaller internetwork environments (e.g., inside a living room). In other words, depending on the current location of the access terminal 1920, the access terminal 1920 may be served by an access node 1960 of a mobile network 1950 macrocell or any one of a set of femto nodes 1910 (for example, femto nodes 1910A and 1910B that are located inside the corresponding residential premises 1930 of the user). For example, when a subscriber is outside his home, he is served by a standard macro access node (for example, node 1960) and when a subscriber is at home, he is served by a femto node (for example, node 1910A). It should be understood here that femtocell 1920 may be backward compatible with existing access terminals 1920.

Femtocell 1910 can be deployed on a single frequency or, alternatively, on multiple frequencies. Depending on the particular configuration, a single frequency or one or more of a plurality of frequencies may overlap with one or more frequencies used by a macro node (e.g., node 1960).

In some aspects, access terminal 1920 may be configured to connect to a preferred femto node (eg, a home femto node of access terminal 1920) whenever such a connection is possible. For example, whenever the access terminal 1920 is within the user's home 1930, it may be desirable for the access terminal 1920 to communicate only with the home femto node 1910.

In some aspects, if the access terminal 1920 operates within the 1950 cellular network but is not permanently located in its most preferred network (e.g., as defined in the preferred roaming list), access terminal 1920 may continue to search for the most preferred network (e.g., the preferred femto node 1910) using re-selection of the best system ("BSR", PLC), which may include periodic scanning of available systems, to determine whether the best systems are currently available, followed by attempts to associate with such preferred systems. In the process of obtaining, the access terminal 1920 may limit its search to a specific range and channel. For example, a search for the most preferred system may be repeated periodically. After discovering the preferred femto node 1910, access terminal 1920 selects the femto node 1910 to operate within its service area.

Femtocell may be limited in some aspects. For example, a given femto node can provide only certain services for certain access terminals. When deployed with a so-called limited (or closed) association, this access terminal can only be served by a mobile network with a macro node and a specific set of femto nodes (for example, femto nodes 1910, which are constantly located within the respective residential premises of the 1930 user). In some embodiments, a node may be limited so that it does not provide at least one node with at least one of: signaling, data access, registration, paging, or service provision.

In some aspects, a restricted femto node (which may also be called a home node in a closed subscriber group) is one that provides a service for a limited, predetermined set of access terminals. Such a set may be temporarily or permanently expanded as necessary. In some aspects, a closed subscriber group (“CSG” (CGA)) may be defined as a set of access nodes (eg, femto nodes) that share a common access control list of access terminals. A channel in which all femto nodes work (or in all restricted femto nodes) in a region can be called a femto channel.

Various relationships may thus exist between a given femto node and a given access terminal. For example, from the perspective of an access terminal, a femto node without limited association may be called an open femto node. A femto node that is in some way restricted (for example, restricted for association and / or registration) may be called a restricted femto node. A femtocell can be called a femtocell through which an access terminal is authorized for access and operation. A femtocell can be called a femtocell, by which the access terminal is temporarily authorized for access or work. A femto node may be called a femto node where the access terminal is not authorized to access or operate, except, possibly, in emergency situations (for example, 911 calls).

From the perspective of a restricted femto node, an access terminal that is authorized to access a restricted femto node can be called a home access terminal. A guest access terminal may be an access terminal that temporarily accesses a femto node with a restriction. An alien access terminal may be an access terminal that does not have permission to access a femto node with a restriction, except possibly in emergency situations, such as 911 calls (for example, an access terminal that does not have authority or permission to register with a femto node with restriction).

For convenience, the disclosure herein describes various functions in the context of a femto node. However, it should be understood that the pico node may provide the same or similar functions for a larger scope. For example, a pico node may be limited, a home pico node may be defined for a given access terminal, and so on.

A multiple access wireless communication system can simultaneously support data transmission for multiple wireless access terminals. As noted above, each terminal can communicate with one or more base stations by transmitting on the forward and reverse links. A forward link (or downlink) refers to a communication line from base stations to terminals, and a reverse link (or uplink) refers to a communication line from terminals to base stations. Such a communication line can be established through a system of "one input - one output", "multiple inputs - multiple outputs" ("MIMO" (MIMO)) or some other types of systems.

A MIMO system uses multiple (N _T ) transmit antennas and multiple (N _R ) receive antennas for communication. A MIMO channel formed by N _T transmit and N _R receive antennas can be decomposed into N _S independent channels, which are also called spatial channels, where N _S ≤min {N _T , N _R }. Each of the N _S independent channels corresponds to one dimension. A MIMO system can provide improved performance (for example, higher throughput and / or greater reliability) if additional dimensions formed by multiple transmit and receive antennas are used.

A MIMO system can support time division duplex (“TDD”) and frequency division duplex (“FDD”) data transmission. In a TDD system, forward and reverse link transmissions are in the same frequency domain in such a way that the reciprocity principle makes it possible to evaluate the forward link on the reverse link. This allows the gain point to be extracted at the access point by generating a transmission beam when multiple antennas are available at the access point.

The descriptions given herein may be embodied as a node (e.g., a device) that uses various components to exchange data with at least one or more other nodes. In FIG. 21 illustrates several exemplary components that can be used to facilitate communication between nodes. In particular, in FIG. 21 illustrates a wireless device 2110 (e.g., an access point) and a wireless device 2150 (e.g., an access terminal) of a MIMO system 2100. At device 2110, traffic data for multiple data streams is provided from a data source 2112 to a data processor (TX) 2114.

In some aspects, each data stream is transmitted through a respective transmit antenna. Transmit data processor 2114 formats, codes, and interleaves the traffic data for each data stream based on a specific coding scheme selected for that data stream to provide encoded data.

The coded data for each data stream can be multiplexed with pilot data using OFDM technologies (OFDM, orthogonal frequency division multiplexing). The pilot data typically represents a known code combination of data that is processed in a known manner and that can be used in the receiver system to estimate channel response. The multiplexed pilot and encoded data for each data stream is then modulated (i.e., symbol mapping) based on a specific modulation scheme (e.g., BPSK (DPSK, binary phase shift keying), QSPK (QPSK, quadrature phase shift keying), M-PSK (M -PSK, M-digit phase shift keying) or M-QAM (M-QAM, M-digit quadrature amplitude modulation)) selected for this data stream to provide modulation symbols. The data rate, coding and modulation for each data stream can be determined using the instructions executed by the processor 2130. The data storage device 2132 may contain program code, data and other information used by the processor 2130 or other components of the device 2110.

Modulation symbols for all data streams are then provided to a TX MIMO processor 2120, which can further process modulation symbols (e.g., for OFDM). The TX MIMO processor 2120 then provides N _T modulation symbol streams to N _T transceivers ("XCVR") 2122A-2122T. In some aspects, TX MIMO processor 2120 applies beamforming weights to the symbols of the data streams and to the antenna through which these symbols are transmitted.

Each transceiver 2122 receives and processes a respective symbol stream to provide one or more analog signals, further processes (e.g., amplifies, filters, and upconverts) the analog signals to produce a modulated signal suitable for transmission through the MIMO channel. The modulated signals from transceivers 2122A-2122T are then transmitted via N _T antennas 2124A-2124T, respectively.

At device 2150, the transmitted modulated signals are received using N _R antennas 2152A-2152R, and received signals from each antenna 2152 are provided to a respective transceiver ("XCVR") 2154A-2154R. Each transceiver 2154 processes (for example, filters, amplifies, and downconverts) the corresponding received signal, digitizes the processed signal to obtain samples, further processes these samples to obtain a corresponding “received” symbol stream.

A receive (RX) data processor 2160 then receives and processes the N _R received symbol streams from transceivers 2154 based on a specific receiver processing technology to obtain NR "detected" symbol streams. The RX data processor 2160 then demodulates, performs deinterleaving, and decodes each detected symbol stream to recover traffic data for the data stream. The processing performed by the RX data processor 2160 is complementary to the processing performed by the TX MIMO processor 2120 and the TX data processor 2114 in the device 2110.

The processor 2170 periodically determines which precoding matrix should be used (described below). A processor 2170 formulates a reverse link message comprising a matrix index portion and a rank value portion. A data storage device 2172 may store program code, data, and other information used by the processor 2170 or other components of the device 2150.

The message transmitted on the reverse link may contain various types of information related to the communication line and / or the received data stream. The reverse link message is then processed using TX data processor 2138, which also receives traffic data for multiple data streams from data source 2136, modulated by modulator 2180, processed by transceivers 2154A-2154R, and transmitted back to device 2110.

At device 2110, the modulated signals from device 2150 are received using antennas 2124, processed using transceivers 2122, demodulated using a demodulator ("DEMOD") 2140, and processed using receive data processor 2142 to extract a reverse link message transmitted by device 2150. Processor 2130 then determines which precoding matrix should be used to determine the beamforming weights and then processes the highlighted message.

In FIG. 21 also shows that communication components may include one or more components that perform mutual interference control operations, as described herein. For example, a mutual interference control (“INTER”) component 2190 may interact with a processor 2130 and / or other components of device 2110 to transmit / receive signals to / from another device (eg, device 2150), as described herein. Similarly, the interference control component 2192 may interact with the processor 2170 and / or other components of the device 2150 to transmit / receive signals to / from another device (e.g., device 2110). It should be understood that for each device 2110 and 2150 the functions of two or more of the above components may be provided in one component. For example, one processing component may provide the function of a mutual interference control component 2190 and a processor 2130, and one processing component may provide a function of a mutual interference control component 2192 and a processor 2170.

The description provided herein may be embodied in various types of communication systems and / or system components. In some aspects, the description herein can be used in a multiple access system configured to support communication by multiple users by sharing available system resources (for example, by specifying one or more of bandwidth, transmit power, encoding, interleaving, and so on) . For example, the description given here can be applied to any one or combination of the following technologies: code division multiple access ("CDMA" (CDMA)), multi-carrier CDMA ("MCCDMA" (CDMA)), broadband CDMA ("W -CDMA "(ШМДКР)), high-speed packet access (" HSPA "," HSPA + "(HSPA)), time division multiple access systems (" TDMA "(TDMA)), frequency division multiple access (" FDMA " (FDMA)), single-carrier FDMA systems (“SC-FDMA” (FDMA-OH)), orthogonal frequency multiple access systems by division (“OFDMA” (OFDMA)) or to other of a plurality of multiple access technologies. A wireless communication system that uses the description herein can be designed to implement one or more of such standards as IS-95, cdma2000, IS-856, W-CDMA, TDSCDMA (time division mdcr), and other standards. A CDMA network may implement a radio technology such as Universal Terrestrial Radio Access ("UTRA" (URDR)), cdma2000, or some other technology. UTRA includes W-CDMA and low chip rate ("LCR"). Cdma2000 technology covers IS-2000, IS-95, and IS-856 standards. A TDMA network may implement such a radio technology as the Global System for Mobile Communications ("GSM" (GSM)). An OFDMA network may implement such radio technology as deployed UTRA ("E-UTRA" (R-URDR)), IEEE 802.11, IEEE 802.16, IEEE 802.20, flash OFDM®, etc. UTRA, E-UTRA and GSM are part of a universal mobile communications system ("UMTS" (UMTS)). The descriptions given here can be embodied in the Long Term Evolution ("LTE") system of 3GPP, in the ultra-mobile broadband system ("UMB" (UMB)), and in other types of systems. LTE is the UMTS release that uses E-UTRA. Although certain aspects of the disclosure may be described using 3GPP terminology, it should be understood that the descriptions provided herein can be applied in 3GPP technology (Rel99, Re15, Rel6, Rel7), as well as in 3GPP2 technology (1xRTT, 1xEV-DO Rel0, RevA , RevB) and other technologies.

The descriptions provided herein may be incorporated (e.g., embodied in or implemented by) into various devices (e.g., nodes). In some aspects, a node (eg, a wireless node) embodied with the descriptions provided herein may comprise an access point or access terminal.

For example, an access terminal may comprise, may be embodied as, or may be known as, user equipment, a subscriber station, a subscriber module, a mobile station, a mobile device, a mobile node, a remote station, a remote terminal, a user terminal, a user agent, a user device, or may be called using some other terminology. In some embodiments, the access terminal may comprise a cell phone, a cordless telephone, a Session Initiation Protocol (“SIP”) telephone, a wireless local area station (“WLL”), a personal digital assistant (“PDA” ( PDA)), a portable device with wireless capabilities, or some other appropriate processing device connected to a wireless modem. Accordingly, one or more of the aspects described herein may be embedded in a telephone (e.g., cell phone or smartphone), computer (e.g., laptop), portable communications device, portable computing device (e.g., personal digital assistant), entertainment device ( for example, a music device, video device or satellite radio), a global navigation system device or any other suitable device that is capable of exchanging data through of the wireless medium.

An access point may comprise, may be embodied as, or may be known as a Node B, an eNodeB, a radio network controller ("RNC" (RNC)), a base station ("BS" (BS)), a radio base station ("RBS" (BRS) )), base station controller ("BSC" (BSC)), base station of the transceiver ("BTS" (BSP)), transceiver function ("TF" (FP)), radio transceiver, radio router, set of basic services ("BSS" ( NBU)), an extended service suite ("ESS" (NRU)), or may be named using some other similar terminology.

In some aspects, a node (eg, an access point) may comprise an access node for a communication system. Such an access node may provide, for example, connectivity to or with a network (for example, a wide area network, such as the Internet or a cellular communication network) via a wired or wireless communication line to the network. Accordingly, the access node may provide for another node (eg, access terminal) access to the network or to some other functions. In addition, it should be understood that one or both of the nodes can be portable or, in some cases, relatively non-portable.

In addition, it should be understood that the wireless node can be configured to transmit and / or receive information without the use of wireless technology (for example, via cable connection). Thus, the receiver and transmitter, as described herein, may include appropriate communication interface components (e.g., electrical or optical interface components) for exchanging data with a non-wireless transmission medium.

A wireless node may exchange data through one or more wireless communication lines that are based on, or otherwise supported by, the corresponding wireless technology. For example, in some aspects, a wireless node may be associated with a network. In some aspects, the network may comprise a local area network or a wide area network. A wireless device may support or otherwise use one or more of many different wireless technologies, protocols, or standards, such as those described herein (e.g., CDMA, TDMA, OFDM, OFDMA, WiMAX, Wi-Fi, and so on). Similarly, a wireless node may support or otherwise use one or more of a plurality of appropriate modulation or multiplexing schemes. The wireless node may thus include appropriate components (e.g., radio channel interfaces) for establishing and transmitting data via one or more wireless communication lines using the above or other wireless communication technologies. For example, a wireless node may comprise a wireless transceiver with corresponding transmitter and receiver components, which may include various components (e.g., signal generators and signal processors) that facilitate data transmission through a wireless medium.

The components described herein may be embodied in various ways. As shown in FIG. 22-30, devices 2200, 2300, 2400, 2500, 2600, 2700, 2800, 2900, and 3000 are represented as a sequence of interconnected function blocks. In some aspects, the functions of these units may be embodied as a data processing system including one or more processor components. In some aspects, the functions of these units may be implemented using, for example, at least a portion of one or more integrated circuits (e.g., ASIC (SIMS, Specialized Integrated Circuit)). As described herein, an integrated circuit may include a processor, software, other appropriate components, or some combination thereof. The functions of these blocks can also be embodied in some other way, as described here. In some aspects, one or more of the blocks represented by broken lines in FIG. 22-23 are optional.

Devices 2200, 2300, 2400, 2500, 2600, 2700, 2800, 2900, and 3000 may include one or more modules that can perform one or more of the functions described above with reference to various drawings. In some aspects, one or more components of the mutual interference controller 320 or the mutual interference controller 322 may provide a function related, for example, to a HARQ interleaver 2202, a profile specification means 2302, a phase offset means 2402, an identification means 2502, a spectral mask means 2602, means 2702, extension code, processing means 2802, transmit power means 2902, or attenuation coefficient means 3004. In some aspects, the communication controller 326 or the communication controller 328 may provide a function relating, for example, to a means 2204, 2304, 2404, 2504, 2604, 2704, or 2904. In some aspects, the time management controller 332 or the time management controller 334 may provide functions related, for example, to the means 2206, 2506 or 2706 control time characteristics. In some aspects, the communication controller 330 may provide a function related, for example, to the reception means 2802. In some aspects, signal processor 366 may provide a function relating, for example, to processing means 2804. In some aspects, transceiver 302 or transceiver 304 may provide a function relating, for example, to signal determining means 3002.

It should be understood that any references to an element presented here using such a designation as “first”, “second”, etc., in general, do not limit the number or order of these elements. Rather, these notations can be used here as a convenient way of distinguishing between two or more elements or instances of an element. Thus, reference to the first and second elements does not mean that only two elements can be used here or that the first element must precede the second element in a certain way. In addition, unless otherwise indicated, a set of elements may contain one or more elements.

It will be understood by those skilled in the art that information and signals can be represented using any of a variety of different technologies and techniques, for example, data, instructions, commands, information, signals, bits, symbols and chips that can be reference is made in the above description, can be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.

It will also be understood by those skilled in the art that any of the various illustrative logic blocks, modules, processors, tools, circuits, and algorithm steps described with reference to the aspects disclosed herein may be embodied as electrical and hardware (for example, using a digital embodiment, an analog embodiment, or combinations of these two approaches that can be developed using source coding or some other technology), various forms of programs or instructions Containing the development of the code (which may be referred to herein, for convenience, "SOFTWARE" or "software module"), or using a combination of the two approaches. To clearly illustrate such a possibility of mutual replacement of hardware and software, various illustrative components, blocks, modules, circuits, and steps have been described above, in general, with a presentation of their functions. Whether such functions are implemented as hardware or software depends on the particular application and design constraints imposed on the entire system. Specialists in the art can implement the described functions in various ways for each specific application, but such decisions in a particular embodiment should not be interpreted as a departure from the scope of the present disclosure.

The various illustrative logical blocks, modules, and circuits described with reference to the aspects disclosed herein may be embodied within or implemented by an integrated circuit (“IC”), access terminal, or access point. An IC may comprise a general purpose processor, a digital signal processor (DSP (DSP)), a corresponding application specific integrated circuit (ASIC), a programmable gate array (FPGA) or another programmable logic device, a discrete logic element or transistor logic, discrete hardware components , electrical components, optical components, mechanical components, or any combination thereof, designed to fulfill the functions described herein, and may execute codes or instructions that reside I'm inside chips, outside chips, or using both approaches. A general purpose processor may be a microprocessor, but in the alternative, the processor may be any conventional processor, controller, microcontroller, or state machine. A processor may also be embodied as a combination of computing devices, for example, a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.

It should be understood that any particular order or hierarchy of steps in any open process is one of the approximate approaches. Based on constructive preferences, it should be understood that the specific order or hierarchy of stages in the processes can be changed, while remaining within the scope of the present disclosure. The appended claims relating to the method represent elements of the various steps in a specific order, and are not meant to be limited to any particular order or hierarchy presented.

The described functions may be embodied in the form of hardware, software, firmware, or any combination thereof. When implemented as software, the functions may be stored in or transmitted through a computer-readable storage medium as one or more instructions or codes. Computer-readable storage media include both computer storage media and data transmission media including any medium that facilitates transferring a computer program from one place to another. Storage media may be any available media that can be accessed by a computer. By way of example and not limitation, such computer-readable storage media may include RAM (RAM, random access memory), ROM (ROM, read-only memory), EEPROM (EEPROM, electrically erasable programmable read-only memory), CD-ROM or other storage devices optical disks, magnetic disk drives or other magnetic storage devices, or any other medium that can be used to move or save the required program code in the form of instructions or data structures that can be accessed by computer. In addition, any connection is correctly called a computer readable storage medium. For example, if the software is transmitted from a website, server, or other remote source using a coaxial cable, fiber optic cable, twisted pair cable, digital subscriber line (DSL), or wireless technologies such as infrared, radio, and microwave, then this coaxial cable, fiber optic cable, twisted pair, DSL or wireless technologies such as infrared, radio and microwave communications will be included in the definition of the storage medium. The terms disk and disc, as used herein, include a compact disc (CD), a laser disc, an optical disc, a digital versatile disc (DVD), a floppy disk, and a blu-ray disc, while disk typically reproduces data magnetically, disc reproduces the data optically with a laser. Combinations of the above means should also be included within the scope of computer readable storage media. In general, it should be understood that a computer-readable storage medium may be embodied in any suitable computer program product.

The above description of the disclosed aspects is provided to enable any person skilled in the art to make use of the present disclosure. Various modifications to these aspects will be apparent to those skilled in the art, and the general principles defined herein may be applied in other aspects without going beyond the scope of the disclosure. Thus, it is not intended that the present disclosure be limited to the aspects presented here, but should be consistent with the broadest possible scope consistent with the principles and new features disclosed herein.

Claims (37)

1. A method for controlling mutual interference in a wireless communication system, the method being carried out by a network node and comprising the steps of:
determining a transmission power profile, wherein the transmission power profile sets different power values as a function of time;
determining the maximum and minimum power levels for the transmission power profile;
determining a time period for the transmission power profile and
transmit a transmit power profile and at least one indicator of the transmit power profile to a plurality of access points.
2 The method according to claim 1, further comprising stages in which:
receive information related to mutual interference in the downlink; and
adapt the maximum and minimum power levels and / or time period based on this information. 3. The method according to claim 2, in which said information contains at least one report with the results of measurements in the downlink, received from at least one access terminal associated with at least one of the access points . 4. The method according to claim 1, further comprising the steps of adapting the maximum and minimum power levels and / or the time period based on the number of active access terminals associated with the access points and / or based on data traffic in the downlink associated with access points. 5. The method according to claim 1, in which at least part of the access points are neighboring access points, the method further comprising the steps of:
set different phase shift values of the transmit power profile for different neighboring access points to reduce mutual interference in the downlink and
transmit phase shift values of the transmit power profile to neighboring access points. 6. A network node device for controlling interference in a wireless communication system, comprising:
a mutual interference controller configured to determine a transmit power profile, determine a maximum and minimum power level for a transmit power profile, and determine a time period for a transmit power profile, the transmit power profile setting different power values depending on time; and
a communication controller configured to transmit a transmission power profile and at least one indicator of the transmission power profile to a plurality of access points. 7. The device according to claim 6, in which:
the communication controller is further configured to receive information related to mutual interference in the downlink; and
the mutual interference controller is further configured to adapt the maximum and minimum power levels and / or time period based on this information. 8. The device according to claim 7, in which said information contains at least one report with the results of measurements in the downlink, received from at least one access terminal associated with at least one of the access points . 9. The device according to claim 6, in which the mutual interference controller is further configured to adapt the maximum and minimum power levels and / or time period based on the number of active access terminals associated with access points and / or based on data traffic in a downlink communication associated with access points. 10. The device according to claim 6, in which:
at least a portion of the access points are neighboring access points;
moreover, the mutual interference controller is further configured to set various phase shift values of the transmit power profile for different neighboring access points to reduce mutual interference in the downlink; and
the communication controller is further configured to transmit phase offset values of the transmit power profile to neighboring access points. 11. A network node device for controlling interference in a wireless communication system, comprising:
means for determining the transmission power profile, the maximum and minimum power levels for the transmission power profile and the time period for the transmission power profile, wherein the transmission power profile sets different power values depending on time; and
means for transmitting a transmit power profile and at least one indicator of a transmit power profile to a plurality of access points. 12. The device according to claim 11, in which:
the transmission means is configured to receive information related to mutual interference in the downlink; and
determination means is adapted to adapt the maximum and minimum power levels and / or time period based on this information. 13. The device according to p. 12, in which said information contains at least one report with the results of measurements in the downlink, received from at least one access terminal associated with at least one of the access points . 14. The device according to claim 11, in which the determination means is adapted to adapt the maximum and minimum power levels and / or time period based on the number of active access terminals associated with the access points, and / or based on data traffic in the downlink, associated with access points. 15. The device according to claim 11, in which: at least part of the access points are neighboring access points;
moreover, the determination means is configured to set different phase offset values of the transmit power profile for different neighboring access points to reduce mutual interference in the downlink; and
the transmission means is configured to transmit phase shift values of the transmit power profile to neighboring access points. 16. A computer-readable storage medium containing codes enabling the computer to execute:
determining a transmission power profile, wherein the transmission power profile sets various power values as a function of time;
determining the maximum and minimum power levels for the transmission power profile;
determining a time period for the transmission power profile and
transmitting the transmit power profile and at least one indicator of the transmit power profile to multiple access points. 17. The computer-readable storage medium according to clause 16, further comprising codes for the computer to execute
receiving information related to mutual interference in the downlink; and
adapting the maximum and minimum power levels and / or time period based on this information. 18. The computer-readable storage medium according to claim 16, wherein at least a portion of the access points are adjacent access points, and the medium further comprises codes enabling the computer to set different phase offset values of the transmit power profile for different neighboring access points to reduce mutual interference in the downlink; and
transmit phase shift values of the transmit power profile to neighboring access points. 19. A method for managing mutual interference in a wireless communication system, the method being carried out by an access point and comprising the steps of:
determining a phase offset for the transmission power profile received from the network node with at least one indicator of the transmission power profile, wherein the transmission power profile sets various power values that vary periodically with time; and
transmit in accordance with the transmission power profile and the determined phase offset. 20. The method according to claim 19, further comprising the step of determining mutual interference in the downlink, the determination of the phase offset based on these mutual interference. 21. The method according to claim 19, in which the determination of the phase offset comprises the step of selecting a phase offset associated with a relatively low level of mutual interference in the downlink. 22. The method according to claim 19, in which the determination of the phase offset comprises the step of communicating with a neighboring access point to select a phase offset that is different from the phase offset used by the neighboring access point. 23. The method according to claim 19, wherein said at least one indicator comprises a maximum and minimum power levels and a time period for a transmission power profile, said transmission additionally based on these maximum and minimum power levels and a time period. 24. The method according to claim 19, in which the node that performs the transmission is limited in that it does not provide for at least one node at least one of the group consisting of signaling, data access, registration and service. 25. An access point device for controlling interference in a wireless communication system, comprising:
a mutual interference controller configured to determine a phase offset for the transmit power profile received from the network node with at least one transmit power profile indicator, the transmit power profile setting various power values periodically varying with time; and
a communication controller configured to transmit in accordance with the transmission power profile and the determined phase offset. 26. The device according A.25, in which the mutual interference controller is additionally configured to determine mutual interference in the downlink, and the determination of the phase offset is based on these mutual interference. 27. The device according A.25, in which the determination of the phase offset comprises the step of selecting a phase offset associated with a relatively low level of mutual interference in the downlink. 28. The device according A.25, in which the determination of the phase offset comprises the step of communicating with a neighboring access point to select a phase offset that is different from the phase offset used by the neighboring access point. 29. The device according A.25, in which the aforementioned at least one indicator contains the maximum and minimum power levels and a time period for the transmission power profile, while said transmission is additionally based on these maximum and minimum power levels and the time period. 30. An access point device for controlling interference in a wireless communication system, comprising:
means for determining a phase offset for the transmission power profile received from the network node with at least one indicator of the transmission power profile, wherein the transmission power profile sets various power values periodically varying with time; and
transmission means in accordance with the transmission power profile and the determined phase offset. 31. The device according to clause 30, in which the determination means determines the mutual interference in the downlink, and
phase shift determination is based on these mutual interference. 32. The device according to item 30, in which the determination of the phase offset comprises the step of selecting a phase offset associated with a relatively low level of mutual interference in the downlink. 33. The device according to item 30, in which the determination of the phase offset comprises the step of communicating with a neighboring access point to select a phase offset that is different from the phase offset used by the neighboring access point. 34. The apparatus of claim 30, wherein said at least one metric comprises a maximum and minimum power levels and a time period for a transmission power profile, said transmission additionally based on these maximum and minimum power levels and a time period. 35. A computer-readable storage medium containing codes capable of being executed by a computer
determining a phase offset for the transmission power profile received from the network node with at least one indicator of the transmission power profile, wherein the transmission power profile sets different power values that vary periodically with time; and
transmitting in accordance with the transmission power profile and the determined phase offset. 36. The computer-readable storage medium according to claim 35, further comprising codes enabling the computer to determine mutual interference in the downlink, the determination of the phase offset based on these mutual interference. 37. The computer-readable medium according to claim 35, wherein determining the phase offset comprises communicating with a neighboring access point to select a phase offset that is different from the phase offset used by the neighboring access point. 38. The computer-readable medium according to claim 35, wherein said at least one indicator comprises a maximum and minimum power levels and a time period for a transmission power profile, wherein said transmission is further based on these maximum and minimum power levels and a time period .

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