USRE48530E1 - Method and system for dynamic cell configuration - Google Patents

Abstract

An apparatus for adapting hyper cells in response to changing conditions of a cellular network is disclosed. During operation, the apparatus collects data regarding network conditions of the cellular network. In accordance with the collected network condition data, the apparatus changes an association of a transmit point from a second cell ID of a second hyper cell to a first cell ID of a first hyper cell. Virtual data channels, broadcast common control channel and virtual dedicated control channel, transmit point optimization, UE-centric channel sounding and measurement, and single frequency network synchronization are also disclosed.

Description

More than one reissue application has been filed for the reissue of U.S. Pat. No. 8,838,119. The reissue applications are (1) the present application, U.S. patent application Ser. No. 15/997,317, which is an application for reissue of U.S. Pat. No. 8,838,119, and is a continuation of U.S. patent application Ser. No. 15/261,269; (2) U.S. patent application Ser. No. 15/261,269, which also is an application for reissue of U.S. Pat. No. 8,838,119; and (3) U.S. patent application Ser. Nos. 15/995,803, 15/996,238, 16/000,228, 15/996,239, 15/995,880, 15/996,067, 15/997,230, 15/997,280, 15/996,118, 15/996,242, and 15/996,228, all of which are applications for reissue of U.S. Pat. No. 8,838,119, and continuations of U.S. patent application Ser. No. 15/261,269.

BACKGROUND

1. Field

This disclosure is generally related to improving performance of cellular networks. More specifically, this disclosure is related to a method and system for dynamically generating and adapting hyper cells in response to network conditions. Various embodiments are also related to selecting optimal transmit points for virtual channels.

2. Related Art

In traditional cellular networks, the location of each transmit point is carefully planned. Each transmit point creates a cell and is assigned a unique cell identifier (ID) to define the control channel and data channel so that simultaneous transmit point to user equipment (UE) communications can be supported for each cell. A single cell serves each UE, and the network maintains the association between the cell and the UE until handover is triggered.

As the demand on mobile broadband increases, networks are deployed more densely and heterogeneously with a greater number of base stations. Cells become smaller and a corresponding greater number of cell edges are created. Cell ID assignment becomes more difficult and the frequency of handovers increases as the UE moves between cells. Further, the density of the cells creates much interference between neighboring cells.

In one approach, LTE Coordinated Multipoint (CoMP) scenario 4 specifies that one or more remote radio heads (RRHs) share a same cell ID as a macro cell to which the RRHs are connected. However, LTE CoMP scenario 4 (available at http://www.3gpp.org/ftp/Specs/html-info/36819.htm) only allows fixed sharing of a single cell ID between a macro cell and all RRHs controlled by it. There is handover and changing of the cell ID when the user moves away from the macro cell and the connected RRHs. Such an approach is insufficient for addressing the problems of interference, complex cell ID assignment, and frequent handovers.

SUMMARY

One embodiment of the present invention provides a system for adapting hyper cells in response to changing conditions of a cellular network. During operation, the system collects data regarding network conditions of the cellular network; in accordance with the collected data, determines that a transmit point is to be added to a first hyper cell, wherein the first hyper cell includes at least one transmit point associated with a first cell identifier (ID); and changes an association of the transmit point from a second cell ID to the first cell ID, wherein at least one transmit point of a second hyper cell is associated with the second cell ID.

Another embodiment of the present invention provides a system for transmitting virtual channels in a cellular network. The system includes a virtual channel transmission mechanism configured to select one or more transmit points from a set of transmit points to transmit a virtual dedicated control channel and/or a virtual data channel to a serviced UE, wherein the one or more transmit points share a common cell ID; and wherein one or more transmission schemes of the virtual data channel and virtual dedicated control channel, including scrambling, pilot design, and/or pilot sequence and location, are created in accordance with a UE ID.

A further embodiment of the present invention provides a method for transmitting virtual channels in a cellular network. The method includes selecting one or more transmit points from a set of transmit points to transmit a virtual dedicated control channel and/or a virtual data channel to a serviced user equipment (UE), wherein the one or more transmit points share a common cell ID; and wherein one or more transmission schemes of the virtual data channel and virtual dedicated control channel, including scrambling, pilot design, and/or pilot sequence and location, are created in accordance with a UE ID.

A further embodiment of the present invention provides a method for adapting hyper cells in response to changing conditions of a cellular network. The method includes collecting data regarding network conditions of the cellular network; in accordance with the collected data, determining that a transmit point is to be added to a first hyper cell, wherein the first hyper cell includes at least one transmit point associated with a first cell ID; and changing an association of the transmit point from a second cell ID to the first cell ID, wherein at least one transmit point of a second hyper cell is associated with the second cell ID.

BRIEF DESCRIPTION OF THE FIGURES

FIG. 1A illustrates an exemplary CRAN communication system from which hyper cells may be generated, in accordance with an embodiment of the present invention.

FIG. 1B illustrates two hyper cells with a shared transmit point, in accordance with an embodiment of the present invention.

FIG. 2 presents a diagram illustrating an example of how to create hyper cells in a CRAN cluster, in accordance with an embodiment of the present invention.

FIG. 3 presents a diagram of an example hyper cell with multiple virtual data channels, in accordance with an embodiment of the present invention.

FIG. 4 presents a diagram illustrating an exemplary downlink (DL) control channel design, in accordance with an embodiment of the present invention.

FIG. 5 andFIG. 6 each present a flow chart illustrating a process of selecting transmit points for a virtual data channel and/or a virtual dedicated control channel, in accordance with an embodiment of the present invention.

FIG. 7 illustrates an exemplary computing system for enabling dynamic hyper cell configuration, in accordance with an embodiment of the present invention.

In the figures, like reference numerals refer to the same figure elements.

DETAILED DESCRIPTION

The following description is presented to enable any person skilled in the art to make and use the embodiments, and is provided in the context of a particular application and its requirements. Various modifications to the disclosed embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other embodiments and applications without departing from the spirit and scope of the present disclosure. Thus, the present invention is not limited to the embodiments shown, but is to be accorded the widest scope consistent with the principles and features disclosed herein.

Overview

Embodiments of the present invention solve the problems of excessive interference and management overhead in cellular networks by introducing the concept of “hyper cell” and dynamically managing hyper cells to eliminate cell edge UEs and optimally selecting transmit points for UEs. A hyper cell is a virtual entity for dynamical coordination of data and control signaling transmission. It is a logic cell and the coverage of the hyper cell can change depending on the hyper cell's association to the physical transmit point(s). From the perspective of network, a hyper cell includes a group of transmit points which have relatively strong interference and are connected via high capacity backhaul. From the perspective of a UE, a hyper cell is an area covered by a virtual access entity.

A dynamic cell configuration system disassociates the concept of cell IDs from the physical topology of the cellular network, which facilitates greater flexibility and efficiency in network management. By breaking the bind between the cell ID and the physical transmitter, the system can generate hyper cells that include multiple transmit points having the same cell ID. The system adapts the hyper cells according to network topology, load distribution, and UE distribution. This reduces the frequency of handovers and amount of interference. The system can also share transmit points between multiple hyper cells by switching the transmit point between the hyper cells. This hyper cell configuration reduces the number of cell edge UEs, reduces interference, and improves the UE transition between hyper cells. The system can further select optimal transmit points within the hyper cells to boost the capacity of virtual channels. In addition, the virtual control channels and virtual data channel can be de-coupled for optimal performance.

Network Environment

A cloud radio access network (CRAN) cluster consolidates all basic processing power of a cellular network. The CRAN manages a group of transmit points that are connected together with a high-speed backhaul network. A CRAN central processing unit performs the processing for the multiple transmit points. This brings the network intelligence into the cloud, leaving only the radios and antennas at the transmission site. By centralizing all the active electronics of multiple cell sites at one location, the operating costs are minimized.

In one embodiment, in a CRAN cluster, a supernode generates a hyper cell by assigning the same cell ID to one or more transmit point(s) which have the strongest mutual inter-cell interference. The supernode may estimate inter-cell interference based on UE reports or the measurement at transmit points. A supernode can be a base station, computing station, or controller configured to generate and manage hyper cells. The supernode can manage baseband signal processing of all transmit points controlled by the supernode. In some implementations, the supernode can also be responsible for only part of signal processing, depending on backhaul capability.

The cell ID is a logical assignment to all physical transmit points of the hyper cell. The hyper cell may be dynamically configured. Unlike traditional cellular networks, there is no fixed one-to-one mapping relation between a transmit point and a cell ID. The area served by the hyper cell is amorphous and the system dynamically adds/removes transmit points to/from the hyper cell.

In one embodiment, the system supports overlapped hyper cells where a transmit point can be logically associated with different hyper cells. For the transmitters that are physically located at the boundary of hyper cells, logically the network associates the transmit point with different hyper cells at different points in time, frequency, or space. The hyper cells may share the resources of the transmit point. A shared transmit point can reduce interference for UEs located at the boundary between the two sharing hyper cells. UEs that are located near the boundaries of two hyper cells experience less handovers because the shared transmit point is associated with either hyper cell at different times, frequencies or spatial directions. Further, as a UE moves between the two hyper cells, the transition is a smoother experience for the user. In one embodiment, the network changes the cell ID of the transmit point to transition a user moving between hyper cells.

Embodiments of the present invention also facilitate virtual channels which allow for greater scheduling flexibility, increased data and control channel capacity, energy savings, and improved mobility management. Subsequent sections of this disclosure discuss five aspects of virtual channels and/or hyper cells in greater detail. These five aspects are: virtual data channels, broadcast common control channel and virtual dedicated control channel, transmit point optimization, UE-centric channel sounding and measurement, and single frequency network (SFN) synchronization. The virtual data channel, broadcast common control channel, virtual dedicated control channel, and/or synchronization channel can also be implemented separate from the hyper cells.

In one embodiment, the supernode is a part of a system that manages all aspects of hyper cells and virtual channels. The system can also include a hyper transceiver to enable joint scheduling and joint transmission for a hyper cell. Each hyper cell supports a single centralized data plane and a single centralized control plane. In one embodiment, a CRAN sub-cluster supernode or CRAN cluster supernode generates the virtual data channels, broadcast common control channel and virtual dedicated control channels of the hyper cell.

CRAN Communication System

FIG. 1A illustrates an exemplaryCRAN communication system100 from which hyper cells may be generated, in accordance with an embodiment of the present invention. Generally, thesystem100 enables multiple wireless users to transmit and receive data and other content. Thesystem100 may implement one or more channel access methods, such as code division multiple access (CDMA), time division multiple access (TDMA), frequency division multiple access (FDMA), orthogonal FDMA (OFDMA), or single-carrier FDMA (SC-FDMA). AlthoughFIG. 1A illustrates an example architecture for hyper cells, embodiments of the invention are not limited to a particular architecture. Other network architectures for hyper cells are also possible. For example, any network architecture where transmit points in the network are controlled by one or more supernodes with centralized signal processing capability can also work with hyper cells.

In this example,communication system100 includes user equipment (UE)110a-110c, transmitpoints130a-130b, twoaccess units170a-170b, acore network132, a public switched telephone network (PSTN)140, theInternet150, andother networks160. While certain numbers of these components or elements are shown inFIG. 1A, any number of these components or elements may be included in thesystem100.

TheUEs110a-110c are configured to operate and/or communicate in thesystem100. For example, theUEs110a-110c are configured to transmit and/or receive wireless signals. EachUE110a-110c represents any suitable end user device and may include such devices (or may be referred to) as a user device, wireless transmit/receive unit (WTRU), mobile station, fixed or mobile subscriber unit, pager, cellular telephone, personal digital assistant (PDA), smartphone, laptop, computer, touchpad, wireless sensor, or consumer electronics device.

Access units170a,170b can each be a base station controlling transmitters or a controller controlling multiple base stations. A base station can control multiple transmitters. Transmitpoints130a,130b can be any type of transmitter. The transmitters can be, for example, mobile-relay station, base station transmitter, pico transmitter, or femto transmitter. The transmitters can be remote radio heads (RRHs) in some implementations. The transmit points can also be base stations controlled by a controller. In some embodiments, multiple-input multiple-output (MIMO) technology may be employed having multiple transceivers for each cell.

Eachaccess unit170a-170b is configured to wirelessly interface with one or more of theUEs110a-110c to enable access to thecore network132, thePSTN140, theInternet150, and/or theother networks160. In various embodiments, theaccess units170a-170b (or transmitpoints130a,130b) may also include (or be) one or more of several well-known devices, such as a base transceiver station (BTS), a Node-B (NodeB), an evolved NodeB (eNodeB), a Home NodeB, a Home eNodeB, a site controller, an access point (AP), or a wireless router. One or more Node-B may be controlled by radio network controllers.

In an embodiment, CRAN systems can include a base station or a centralized node controlling one or more RRHs. Base stations can implement MAC/PHY and antenna array system (AAS) functionality. Each base station operates to transmit and/or receive wireless signals within a particular geographic region or area. For example,access units170a-170b can be base stations and, through remote radio heads, may communicate with one or more of theUEs110a-110c over one or more air interfaces using wireless communication links. The air interfaces may utilize any suitable radio access technology.

A RRH contains the radio frequency circuitry plus analog-to-digital/digital-to-analog converters and up/down converters. The RRHs are located between a base station and the UEs, and are connected to a base station using optical fiber or any other communication line. The RRHs receive and convert digital signals to analog, then amplifies the power and sends the radio frequency signals.

It is contemplated that thesystem100 may use multiple channel access functionality, including such schemes as described above. In particular embodiments, the base stations and UEs implement LTE, LTE-A, and/or LTE-B. Of course, other multiple access schemes and wireless protocols may be utilized.

Each of theaccess units170a,170b are in communication with thecore network132 to provide theUEs110a-110c with voice, data, application, Voice over Internet Protocol (VoIP), or other services. The access units and/or thecore network132 may be in direct or indirect communication with one or more other access units (not shown). Thecore network132 may also serve as a gateway access for other networks (such asPSTN140,Internet150, and other networks160). In addition, some or all of theUEs110a-110c may include functionality for communicating with different wireless networks over different wireless links using different wireless technologies and/or protocols.

Each of the example transmitpoints130a-130b, or any combination of the illustrated transmit points, may be assigned a common cell ID and form a hyper cell. Hyper cells are discussed in greater detail with respect toFIG. 1B.

AlthoughFIG. 1A illustrates one example of aCRAN communication system100 from which hyper cells may be generated, various changes may be made toFIG. 1A. For example,CRAN communication system100 could include any number of UEs, base stations, supernodes, networks, or other components in any suitable configuration. Also, the techniques described herein can be used in any other suitable system.

Hyper Cell Examples

FIG. 1B illustrates two hyper cells with a shared transmit point, in accordance with an embodiment of the present invention.Hyper cells182,184 each includes many transmit points that are assigned the same logical cell ID. For example,hyper cell182 includes transmitpoints186,187,188,189,190, and192. Transmit points190,192 communicates withUE194. Transmitpoint196 is assigned tohyper cells182,184 at different times, frequencies or spatial directions and the system switches the logical cell ID for transmitpoint196 between the two hyper cells.

In one embodiment, a system dynamically updates the hyper cell topology to adapt to changes in network topology, load distribution, and/or UE distribution. The system may include a data collector to collect data regarding network conditions of the cellular network. If the concentration of UEs increases in one region, the system may dynamically expand the hyper cell to include transmit points near the higher concentration of UEs. For example, the system may expandhyper cell182 to include other transmit points if the concentration of UEs located at the edge of the hyper cell increases above a certain threshold. As another example, the system may expandhyper cell182 to include a greater concentration of UEs located between two hyper cells. Also, if the traffic load increases significantly at one region, the system may also expand the hyper cell to include transmit points near the increased traffic load. For example, if the traffic load of a portion of the network exceeds a predetermined threshold, the system may change the cell IDs of one or more transmit points that are transmitting to the impacted portion of the cellular network.

Further, the system may change the cell ID associated with transmitpoint196 from the cell ID ofhyper cell182 to the cell ID ofhyper cell184. In one implementation, the system can change the association of a transmit point with different hyper cells every 1 millisecond. With such a flexible cell formation mechanism, all UEs can be served by the best transmit points so that virtually there are no cell edge UEs.

In one embodiment, the system may also save power by turning off silent transmit points (e.g., any transmit point other than transmitpoints190,192) if there are no UEs to service for those silent transmit points. The system can also save power by turning off transmit points according to some criteria (e.g., turn off those that are serving less than a threshold number of UEs).

FIG. 2 presents a diagram illustrating an example of how to create hyper cells in a CRAN cluster, in accordance with an embodiment of the present invention. ACRAN cluster202 includes a number of individual cells, such ascell204. Without hyper cells, the CRAN network can only assign each transmit point a unique cell ID to form the individual cells. To create a hyper cell, the system assigns a common cell ID to all the cells of the CRAN cluster that form the hyper cell. In one embodiment, the network may create multiple hyper cells within a CRAN cluster. Each hyper cell has a unique cell ID.

FIG. 2 also illustrates exemplary optimal transmit points for facilitating a virtual data channel and virtual dedicated control channel forUE206. The three transmitpoints208,210, and212 are optimally situated to transmit the virtual channels toUE206. The three transmit points form a virtual transmit point. The system can dynamically combine multiple physical transmitters to form a virtual transmit point. From the perspective of a UE, the virtual transmit points appear to be a single transmitter. The system can create many virtual transmit points for a hyper cell and coordinate their transmissions. The system can dynamically change the physical transmitters that make up the hyper cell. Determining optimal transmit points is further discussed with respect toFIG. 5 andFIG. 6.

Virtual Data Channels

FIG. 3 presents a diagram of an example hyper cell with multiple virtual data channels, in accordance with an embodiment of the present invention. The system can support multiple parallel data channels within a single hyper cell, each serving a different UE. In other words, each virtual data channel is UE-specific. The hyper cell may have multiple different physical transmit points transmitting to create the virtual data channels. The actual physical transmit points of the virtual data channels are also UE-specific and are transparent to each UE. A UE distinguishes virtual data channel signals by examining the UE ID associated with each transmission. The data transmission schemes, including data scrambling, pilot design, and pilot sequence and location, are all created in accordance with the UE ID.

As the UEs move to different locations, the system dynamically assigns different physical transmit points to service the UEs. The physical transmit points form the virtual data channels for the respective serviced UEs. Note that the cell ID transmitted from the different physical transmit points belonging to the same hyper cell remains the same. As illustrated inFIG. 3, an examplehyper cell300 has three virtual data channels, one for each UE. Three transmitpoints302,304,306 provide a virtual data channel forUE307, two transmitpoints302,304 provide a virtual data channel forUE309, and two transmitpoints308,310 provide a virtual data channel forUE311. Transmit points312,314 are silent and may be turned off to save energy. The description associated withFIG. 5 andFIG. 6 discusses additional details of various embodiments for optimally selecting transmit points.

In one embodiment, with the CRAN framework, the supernode controls the generation of the virtual data channels based on load balancing and UE distribution within a CRAN cluster. A CRAN cluster can support multiple parallel virtual data channels.

Broadcast Common Control Channel/Virtual Dedicated Control Channel

FIG. 4 presents a diagram illustrating an exemplary downlink (DL) control channel design, in accordance with an embodiment of the present invention. The system provides for a broadcast common control channel and a virtual dedicated control channel. A broadcastcommon control channel402 carries common system configuration information transmitted by all or partial transmit points sharing the same cell ID. Every UE can decode information from the broadcastcommon control channel402 in accordance with a common reference signal (CRS). The CRS sequence and location are tied to the cell ID of the hyper cell.

A virtualdedicated control channel404 carries UE-specific control information (e.g., DL scheduling, uplink (UL) grant). Each ofUEs406,408 has a subset of transmit points surrounding the UE. The transmit points transmit the UE-specific virtualdedicated control channels410,412. Virtualdedicated control channel410 is specific toUE406, and virtualdedicated control channel412 is specific toUE408. In some embodiments, one or more transmission schemes of the virtual data channel and/or the virtual dedicated control channel, including scrambling, pilot design, and/or pilot sequence and location, are created in accordance with a UE ID. Further, a hyper cell ID can be applied together with the UE ID to differentiate transmission of the virtual data channel and/or virtual control channel from different hyper cells.

Parallel virtual dedicated control channels can be provided in each hyper cell. The demodulation of each virtual dedicated control channel is performed in accordance with a UE-specific reference signal (RS), the sequence and location of which are linked to the UE ID. To distinguish the virtual dedicated control channels communicated from different hyper cells, the sequence of UE-specific RS is covered by a sequence specific to each hyper cell.

The system may apply transmit point selection techniques and transmit power control techniques to minimize intra-hyper cell interference and inter-hyper cell interference. The selected transmit points are transparent to the UEs. In one embodiment, for a UE with a poor Signal to Interference plus Noise Ratio (SINR), the system can transmit the virtual dedicated control channel and/or virtual data channel from multiple transmit points to improve signal quality. In addition, the system may apply Transmit Time Interval (TTI) bundling to a fixed or slow moving UE in order to further enhance the capacity of the UE-specific virtual dedicated control channel.

Selecting Transmit Points for Virtual Channels

FIG. 5 andFIG. 6 each present a flow chart illustrating a process of selecting transmit points for a virtual data channel and/or a virtual dedicated control channel, in accordance with an embodiment of the present invention. A virtual channel transmission mechanism can be configured to select one or more transmit points from a set of transmit points to transmit a virtual dedicated control channel and/or a virtual data channel to a serviced UE. For each UE, there are two techniques for selecting the optimal transmit points for the virtual data channel and the virtual dedicated control channel. The selection processes attempt to maximize the capacity of the UE-specific virtual dedicated control channel and virtual data channel.FIG. 5 presents a UE-centric technique for selecting the transmit points.FIG. 6 presents a network-centric technique for selecting the transmit points. The transmit points for a virtual data channel can be different from the transmit points for a virtual dedicated control channel, for the same UE. The selected transmit points are transparent to the UE.

During operation of the technique illustrated inFIG. 5, each of the transmit points sends a DL sounding reference signal (SRS) (operation502) as a training sequence. In one embodiment, different transmit points transmit the DL SRS at different frequencies or at different times. After receiving the DL SRS, the UE measures the signal strength of each DL SRS (operation504). The UE reports the measurement results to the supernode (operation506). The supernode generates a table with a UE index and corresponding potential transmit points (operation508). The supernode selects the best transmit points to all served UEs based on the table and the status of network load distribution and UE distribution (operation510). In one embodiment, the supernode compares the reported measurement results to previous DL SRS transmissions to determine the best transmit points for each of the UEs.

During operation of the technique illustrated inFIG. 6, each transmit point detects a UL transmission from a UE within the transmit point's coverage range. The transmissions may be for any data, including any one of a sounding channel, control channel and/or data channel data (operation602). The transmit points measure the strength of the UE signals. The transmit point may filter UEs with insufficient signal strength (operation604). Each transmit point reports measurements of the detected UL transmissions to the supernode (operation606). The supernode generates a table with the UE index and corresponding potential transmit points (operation608). In one embodiment, the supernode populates the table with UEs and the strength of signals received by the transmit points. The supernode selects the optimal transmit points for all served UEs based on the generated table and on the status of network load and UE distribution (operation610).

In one embodiment, to maintain the transparency of the transmit points in each hyper cell, demodulation of the virtual channels is not tied to the transmit points. In one implementation, the system uses the UE ID to bootstrap all communications between the UE and the transmit points. The system distinguishes between the transmission signals of different UEs with a UE-centric reference signal. The system uses a UE-centric demodulation reference signal (DMRS) to decode the virtual dedicated data channel and the virtual dedicated control channel. The system defines the sequence and location of the UE-centric DMRS with the UE index. The system automatically generates each UE index from a respective UE ID or assigns the UE index. Each UE has a unique UE index.

Each hyper cell is associated with a synchronization channel. All or a portion of transmit points in a hyper cell can transmit the synchronization channel. In one embodiment, a transmit point belonging to multiple hyper cells does not transmit the synchronization channel. In another embodiment, frequency division multiplexing (FDM), code division multiplexing (CDM), or time division multiplexing (TDM) can be applied to enable synchronization channel transmission for transmit points associated with multiple hyper cells.

FIG. 7 illustrates an exemplary computing system for enabling dynamic hyper cell configuration, in accordance with an embodiment of the present invention. In one embodiment, a computing andcommunication system700 includes aprocessor702, amemory704, and astorage device706.Storage device706 stores a dynamic hyper cell configuration application708, as well as other applications, such asapplications710 and712. During operation, application708 is loaded fromstorage device706 intomemory704 and then executed byprocessor702. While executing the program,processor702 performs the aforementioned functions. Computing andcommunication system700 is coupled to anoptional display714,keyboard716, andpointing device718.

The data structures and code described in this detailed description are typically stored on a machine-readable storage medium, which may be any device or medium that can store code and/or data for use by a computing system. The machine-readable storage medium includes, but is not limited to, volatile memory, non-volatile memory, magnetic and optical storage devices such as disk drives, magnetic tape, CDs (compact discs), DVDs (digital versatile discs or digital video discs), or other media capable of storing machine-readable media now known or later developed.

The methods and processes described in the detailed description section can be embodied as code and/or data, which can be stored in a machine-readable storage medium as described above. When a computing system reads and executes the code and/or data stored on the machine-readable storage medium, the computing system performs the methods and processes embodied as data structures and code and stored within the machine-readable storage medium.

Furthermore, methods and processes described herein can be included in hardware modules or apparatus. These modules or apparatus may include, but are not limited to, an application-specific integrated circuit (ASIC) chip, a field-programmable gate array (FPGA), a dedicated or shared processor that executes a particular software module or a piece of code at a particular time, and/or other programmable-logic devices now known or later developed. When the hardware modules or apparatus are activated, they perform the methods and processes included within them. Such modules or apparatuses may form part of base stations or supernode machines that manage and enable hyper cells and/or virtual channels or other various features described herein.

An embodiment method for adapting hyper cells in response to changing conditions of a cellular network comprises collecting data regarding network conditions of the cellular network; in accordance with the collected data, determining that a transmit point is to be added to a first hyper cell, wherein the first hyper cell includes at least one transmit point associated with a first cell identifier (ID); and changing an association of the transmit point from a second cell ID to the first cell ID, wherein at least one transmit point of a second hyper cell is associated with the second cell ID.

Optionally, in the embodiment method, the network conditions include load distribution, and the method further comprises determining that a traffic load of a portion of the cellular network exceeds a predetermined threshold; and changing cell IDs of one or more transmit points transmitting to the portion of the cellular network.

Optionally, in the embodiment method, the network conditions include UE distribution across the network, and the method further comprises determining that a concentration of user equipments (UEs) serviced by the cellular network at a boundary of the first hyper cell is above a predetermined threshold; and changing cell IDs of one or more transmit points to the cell ID of the first hyper cell, wherein the one or more transmit points transmit to the boundary of the first hyper cell.

Optionally, the embodiment method further comprises determining that a second transmit point serves less than a threshold number of UEs; and turning off the second transmit point in response to determining that the second transmit point is serving less than the threshold number of UEs.

An embodiment apparatus for adapting hyper cells in response to changing conditions of a cellular network comprises at least one collector configured to collect data regarding network conditions of the cellular network; at least one processing unit configured to: determine that a transmit point is to be added to a first hyper cell in accordance with the collected data, wherein the first hyper cell includes at least one transmit point associated with a first cell identifier (ID); and change an association of the transmit point from a second cell ID to the first cell ID, wherein at least one transmit point of a second hyper cell is associated with the second cell ID.

Optionally, in the embodiment apparatus, the network conditions include load distribution, and the at least one processing unit is configured to determine that a traffic load of a portion of the cellular network exceeds a predetermined threshold; and change cell IDs of one or more transmit points transmitting to the portion of the cellular network.

Optionally, in the embodiment apparatus the network conditions include user equipment (UE) distribution across the network, and the at least one processing unit is configured to determine that a concentration of UEs serviced by the cellular network at a boundary of the first hyper cell is above a predetermined threshold; and change cell IDs of one or more transmit points to the cell ID of the first hyper cell, wherein the one or more transmit points transmit to the boundary of the first hyper cell.

Optionally, in the embodiment apparatus the at least one processing unit is configured to determine that a second transmit point serves less than a threshold number of UEs; and turn off the second transmit point in response to determining that the second transmit point is serving less than the threshold number of UEs.

Optionally, in the embodiment apparatus the apparatus is a base station controlling one or more remote radio heads and the base station is adapted to dynamically change one or more cell identifier (ID) in response to changing network conditions, wherein the base station is connected to each of the one or more remote radio heads via a communication line; the one or more remote radio heads are adapted to receive and transmit radio frequency signals; the base station includes a data collector configured to collect data regarding network conditions of the cellular network; and the base station includes at least one processing unit configured to determine that a transmit point is to be added to a first hyper cell in accordance with the collected data, wherein the first hyper cell includes at least one transmit point associated with a first cell ID; and change an association of the transmit point from a second cell ID to the first cell ID, wherein at least one transmit point of a second hyper cell is associated with the second cell ID, and wherein the transmit point is a remote radio head.

Although the present invention has been described with reference to specific features and embodiments thereof, it is evident that various modifications and combinations can be made thereto without departing from the spirit and scope of the invention. The specification and drawings are, accordingly, to be regarded simply as an illustration of the invention as defined by the appended claims, and are contemplated to cover any and all modifications, variations, combinations or equivalents that fall within the scope of the present invention.

Claims (33)

What is claimed is:

1. A method for adapting hyper cells in response to changing conditions of a cellular network, the method comprising:

collecting data regarding network conditions of the cellular network, the cellular network utilizing a wireless protocol;

in accordance with the collected data, determining that a first transmit point associated with a second hyper cell utilizing the wireless protocol is to be added to a first hyper cell utilizing the wireless protocol, wherein the first hyper cell includes at least one transmit point associated with a first cell identifier (ID); and

changing an association of the first transmit point from a second cell ID to the first cell ID, wherein at least one transmit point of the second hyper cell is associated with the second cell ID.

2. The method ofclaim 1, wherein the network conditions include load distribution, and wherein the method further comprises:

determining that a traffic load of a portion of the cellular network exceeds a predetermined threshold; and

changing cell IDs of one or more transmit points transmitting to the portion of the cellular network.

3. The method ofclaim 1, wherein the network conditions include UE distribution across the network, and wherein the method further comprises:

determining that a concentration of user equipments (UEs) serviced by the cellular network at a boundary of the first hyper cell is above a predetermined threshold; and

changing cell IDs of one or more transmit points to the cell ID of the first hyper cell, wherein the one or more transmit points transmit to the boundary of the first hyper cell.

4. The method ofclaim 1, further comprising:

determining that a second transmit point serves less than a threshold number of UEs; and

turning off the second transmit point in response to determining that the second transmit point is serving less than the threshold number of UEs.

5. An apparatus for adapting hyper cells in response to changing conditions of a cellular network, the apparatus comprising:

at least one collector configured to collect data regarding network conditions of the cellular network, the cellular network configured to utilize a wireless protocol;

at least one processing unit configured to:

determine that a first transmit point associated with a second hyper cell utilizing the wireless protocol is to be added to a first hyper cell utilizing the wireless protocol in accordance with the collected data, wherein the first hyper cell includes at least one transmit point associated with a first cell identifier (ID); and

change an association of the first transmit point from a second cell ID to the first cell ID, wherein at least one transmit point of the second hyper cell is associated with the second cell ID.

6. The apparatus ofclaim 5, wherein the network conditions include load distribution, and the at least one processing unit is configured to:

determine that a traffic load of a portion of the cellular network exceeds a predetermined threshold; and

change cell IDs of one or more transmit points transmitting to the portion of the cellular network.

7. The apparatus ofclaim 5, wherein the network conditions include user equipment (UE) distribution across the network, and the at least one processing unit is configured to:

determine that a concentration of UEs serviced by the cellular network at a boundary of the first hyper cell is above a predetermined threshold; and

change cell IDs of one or more transmit points to the cell ID of the first hyper cell, wherein the one or more transmit points transmit to the boundary of the first hyper cell.

8. The apparatus ofclaim 5, wherein the at least one processing unit is configured to:

determine that a second transmit point serves less than a threshold number of UEs; and

turn off the second transmit point in response to determining that the second transmit point is serving less than the threshold number of UEs.

9. An apparatus for adapting hyper cells in response to changing conditions of a cellular network, the apparatus comprising:

at least one collector configured to collect data regarding network conditions of the cellular network;

at least one processing unit configured to:

determine that a transmit point is to be added to a first hyper cell in accordance with the collected data, wherein the first hyper cell includes at least one transmit point associated with a first cell identifier (ID); and

change an association of the transmit point from a second cell ID to the first cell ID, wherein at least one transmit point of a second hyper cell is associated with the second cell ID,

wherein the apparatus is a base station controlling one or more remote radio heads and wherein the base station is adapted to dynamically change one or more cell identifier (ID) in response to changing network conditions, wherein:

the base station is connected to each of the one or more remote radio heads via a communication line; and

the one or more remote radio heads are adapted to receive and transmit radio frequency signals, and wherein the transmit point is a remote radio head.

10. A method comprising:

receiving, by an apparatus, first information over a user equipment (UE)-specific virtual dedicated control channel transmitted from a first subset of base stations, the first subset of base stations being from a first set of base stations in a first hyper cell of a cellular network, wherein a physical topology of the cellular network is disassociated with cell identifiers (IDs), wherein the first set of base stations in the first hyper cell have no bind with the cell IDs separately, wherein the first set of base stations in the first hyper cell share a first hyper cell ID, wherein the UE-specific virtual dedicated control channel is decoded using a demodulation reference signal (DMRS), and wherein a sequence and a location of the DMRS are generated in accordance with an assigned UE index.

11. The method of claim 10, further comprising:

receiving, by the apparatus, data over a UE-specific virtual dedicated data channel transmitted from a second subset of base stations, the second subset of base stations being from the first set of base stations in the first hyper cell sharing the first hyper cell ID, the second subset of base stations being different from the first subset of base stations, wherein the UE-specific virtual dedicated data channel is decoded using the DMRS.

12. The method of claim 10, wherein the cellular network includes a supernode and a second set of base stations in a second hyper cell, the second set of base stations associated with a second hyper cell ID of the second hyper cell, the supernode configured to perform operations, the operations including:

collecting data regarding network conditions of the cellular network; and

changing a first serving coverage of the first hyper cell and a second serving coverage of the second hyper cell based on the collected data, the changing comprising:

determining that a base station of the second set of base stations to be removed from the second hyper cell and to be added to the first hyper cell based on the collected data, and

changing an association of the base station from the second hyper cell ID to the first hyper cell ID based on the determining.

13. The method of claim 10, wherein the assigned UE index is based on signal strength associated with the apparatus.

14. The method of claim 10, wherein the first subset of base stations are transparent to the apparatus.

15. The method of claim 10, further comprising:

receiving, by the apparatus, second information over a broadcast common control channel transmitted from the first subset of base stations, wherein the second information is decoded in accordance with a reference signal tied to the first hyper cell ID.

16. A method comprising:

transmitting, by a base station to a user equipment (UE), first information over a UE-specific virtual dedicated control channel transmitted from a first subset of base stations, the first subset of base stations including the base station, the first subset of base stations being from a first set of base stations in a first hyper cell of a cellular network, wherein a physical topology of the cellular network is disassociated with cell identifiers (IDs), wherein the first set of base stations in the first hyper cell have no bind with the cell IDs separately, wherein the first set of base stations in the first hyper cell share a first hyper cell ID, wherein the UE-specific virtual dedicated control channel is decoded using a demodulation reference signal (DMRS), wherein a sequence of the DMRS is generated in accordance with an assigned UE index, and wherein the cellular network includes a supernode and a second set of base stations in a second hyper cell, the second set of base stations associated with a second hyper cell ID of the second hyper cell, the supernode configured to perform operations, the operations including:

collecting data regarding network conditions of the cellular network; and

changing a first serving coverage of the first hyper cell and a second serving coverage of the second hyper cell based on the collected data, the changing comprising:

determining that a base station of the second set of base stations to be removed from the second hyper cell and to be added to the first hyper cell based on the collected data, and

changing an association of the base station of the second set of base stations from the second hyper cell ID to the first hyper cell ID based on the determining.

17. The method of claim 16, further comprising:

transmitting, by the base station to the UE, data over a UE-specific virtual dedicated data channel transmitted from a second subset of base stations, the second subset of base stations being from the first set of base stations in the first hyper cell sharing the first hyper cell ID, the second subset of base stations being different from the first subset of base stations, wherein the UE-specific virtual dedicated data channel is decoded using the DMRS.

18. The method of claim 16, wherein the assigned UE index is based on signal strength associated with the UE.

19. The method of claim 16, wherein a location of the DMRS is generated in accordance with the assigned UE index.

20. The method of claim 16, wherein the first subset of base stations are transparent to the UE.

21. The method of claim 16, further comprising:

transmitting, by the base station to the UE, second information over a broadcast common control channel transmitted from the first subset of base stations, wherein the second information is decoded in accordance with a reference signal tied to the first hyper cell ID.

22. An apparatus in a cellular network that includes a first hyper cell, a second hyper cell, and a supernode, the apparatus comprising:

at least one processor; and

a non-transitory computer readable storage medium storing programming, the programming including instructions when executed by the at least one processor to:

receive first information over a user equipment (UE)-specific virtual dedicated control channel transmitted from a first subset of base stations of a first set of base stations in the first hyper cell of the cellular network whose physical topology is disassociated with cell identifiers (IDs), wherein the first set of base stations in the first hyper cell have no bind with the cell IDs separately, wherein the first set of base stations in the first hyper cell share a first hyper cell ID, wherein the UE-specific virtual dedicated control channel is decoded using a demodulation reference signal (DMRS), wherein a sequence of the DMRS is generated in accordance with an assigned UE index, and wherein a second set of base stations in the second hyper cell are associated with a second hyper cell ID of the second hyper cell, the supernode configured to perform operations, the operations including:

collecting data regarding network conditions of the cellular network; and

changing a first serving coverage of the first hyper cell and a second serving coverage of the second hyper cell based on the collected data, the changing comprising:

determining that a base station of the second set of base stations to be removed from the second hyper cell and to be added to the first hyper cell based on the collected data, and

changing an association of the base station from the second hyper cell ID to the first hyper cell ID based on the determining.

23. The apparatus of claim 22, the programming further including instructions when executed by the at least one processor to:

receive data over a UE-specific virtual dedicated data channel transmitted from a second subset of base stations, the second subset of base stations being from the first set of base stations in the first hyper cell sharing the first hyper cell ID, the second subset of base stations being different from the first subset of base stations, wherein the UE-specific virtual dedicated data channel is decoded using the DMRS.

24. The apparatus of claim 22, wherein the assigned UE index is based on signal strength associated with the apparatus.

25. The apparatus of claim 22, wherein a location of the DMRS is generated in accordance with the assigned UE index.

26. The apparatus of claim 22, wherein the first subset of base stations are transparent to the apparatus.

27. The apparatus of claim 22, the programming further including instructions when executed by the at least one processor to:

receive second information over a broadcast common control channel transmitted from the first subset of base stations, wherein the second information is decoded in accordance with a reference signal tied to the first hyper cell ID.

28. A base station that is one of a first set of base stations of a first hyper cell, the base station comprising:

at least one processor; and

a non-transitory computer readable storage medium storing programming, the programming including instructions when executed by the at least one processor to:

transmit, to a user equipment (UE), first information over a UE-specific virtual dedicated control channel transmitted from a first subset of base stations of the first set of base stations in the first hyper cell of a cellular network whose physical topology is disassociated with cell identifiers (IDs), the first subset of base stations including the base station, wherein the first set of base stations in the first hyper cell have no bind with the cell IDs separately, wherein the first set of base stations in the first hyper cell share a first hyper cell ID, wherein the UE-specific virtual dedicated control channel is decoded using a demodulation reference signal (DMRS), and wherein a sequence and a location of the DMRS are generated in accordance with an assigned UE index.

29. The base station of claim 28, the programming further including instructions when executed by the at least one processor to:

transmit, to the UE, data over a UE-specific virtual dedicated data channel transmitted from a second subset of base stations, the second subset of base stations being from the first set of base stations in the first hyper cell sharing the first hyper cell ID, the second subset of base stations being different from the first subset of base stations, wherein the UE-specific virtual dedicated data channel is decoded using the DMRS.

30. The base station of claim 28, wherein the cellular network includes a supernode and a second set of base stations in a second hyper cell, the second set of base stations associated with a second hyper cell ID of the second hyper cell, the supernode configured to perform operations, the operations including:

collecting data regarding network conditions of the cellular network; and

changing a first serving coverage of the first hyper cell and a second serving coverage of the second hyper cell based on the collected data, the changing comprising:

determining that a base station of the second set of base stations to be removed from the second hyper cell and to be added to the first hyper cell based on the collected data, and

changing an association of the base station of the second set of base stations from the second hyper cell ID to the first hyper cell ID based on the determining.

31. The base station of claim 28, wherein the assigned UE index is based on signal strength associated with the UE.

32. The base station of claim 28, wherein the first subset of base stations are transparent to the UE.

33. The base station of claim 28, the programming further including instructions when executed by the at least one processor to:

transmit, to the UE, second information over a broadcast common control channel transmitted from the first subset of base stations, wherein the second information is decoded in accordance with a reference signal tied to the first hyper cell ID.

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