US20150365938A1 - Adaptive Cross-Radio Access Technology (RAT) Channel Assignment - Google Patents
Adaptive Cross-Radio Access Technology (RAT) Channel Assignment Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/29—Control channels or signalling for resource management between an access point and the access point controlling device
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- H04W72/0433—
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
- H04B7/0452—Multi-user MIMO systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
- H04B7/0617—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal for beam forming
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0091—Signaling for the administration of the divided path
- H04L5/0092—Indication of how the channel is divided
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/02—Arrangements for optimising operational condition
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- H04W24/08—Testing, supervising or monitoring using real traffic
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- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/0215—Traffic management, e.g. flow control or congestion control based on user or device properties, e.g. MTC-capable devices
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- H—ELECTRICITY
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- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/08—Access point devices
- H04W88/10—Access point devices adapted for operation in multiple networks, e.g. multi-mode access points
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
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- H04L5/0014—Three-dimensional division
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- H04L5/0094—Indication of how sub-channels of the path are allocated
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- H—ELECTRICITY
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- H04W88/08—Access point devices
Definitions
- the present disclosure relates generally to adaptive cross-radio access technology (RAT) channel assignment.
- RAT cross-radio access technology
- Future wireless environments are envisioned to include access points (APs) for multiple radio access technologies (RATs) operating in close proximity to each other.
- APs may include Massive Multiple Input Multiple Output (M-MIMO) APs equipped with a very large number of transmit/receive antennas (e.g., 32, 64, or 100) that can be used for simultaneous communication with one or more terminals.
- M-MIMO Massive Multiple Input Multiple Output
- FIG. 1 illustrates an example environment in which embodiments can be implemented or practiced.
- FIG. 2 illustrates an example central access controller according to an embodiment.
- FIG. 3 illustrates an example process according to an embodiment.
- FIG. 4 illustrates an example access point according to an embodiment.
- module shall be understood to include at least one of software, firmware, or hardware (such as one or more circuits, microchips, processors, or devices, or any combination thereof), or any combination thereof.
- each module can include one, or more than one, component within an actual device, and each component that forms a part of the described module can function either cooperatively or independently of any other component forming a part of the module.
- multiple modules described herein can represent a single component within an actual device. Further, components within a module can be in a single device or distributed among multiple devices in a wired or wireless manner.
- processor circuitry shall be understood to include one or more: circuit(s), processor(s), or a combination thereof.
- a circuit can include an analog circuit, a digital circuit, state machine logic, other structural electronic hardware, or a combination thereof.
- a processor can include a microprocessor, a digital signal processor (DSP), or other hardware processor.
- DSP digital signal processor
- the processor can be “hard-coded” with instructions to perform corresponding function(s) according to embodiments described herein.
- the processor can access an internal or external memory to retrieve instructions stored in the memory, which when executed by the processor, perform the corresponding function(s) associated with the processor.
- FIG. 1 illustrates an example environment 100 in which embodiments can be implemented or practiced.
- Example environment 100 is provided for the purpose of illustration only and is not limiting of embodiments.
- example environment 100 includes a first Access Point (AP) 102 , a second AP 104 , a central access controller 106 , and a plurality of user equipments (UEs) 110 a , 110 b , and 110 c .
- AP Access Point
- UEs user equipments
- example environment 100 can include more or less APs and UEs than shown in FIG. 1 .
- APs 102 and 104 can be Wireless Local Area Network (WLAN) APs, cellular network base stations, Bluetooth APs, or other wireless multi-access radio network APs. As further described below, APs 102 and 104 may be homogeneous or heterogeneous. In the homogeneous case, APs 102 and 104 have the same capabilities, including maximum transmit power, antenna configuration, and enabled radio access technologies (RATs), for example. For instance, APs 102 and 104 can both be high power/large cell (e.g., macrocell) APs that have an omni-directional antenna configuration and that support the Long Term Evolution (LTE) protocol.
- LTE Long Term Evolution
- APs 102 and 104 can both be low power/small cell (e.g., femtocell, picocell, etc.) APs that support both the LTE and WLAN protocols.
- APs 102 and 104 have different capabilities, including maximum transmit power, antenna configuration, and enabled RATs, for example.
- AP 102 may be a high power/large cell LTE evolved Node B (eNB) and AP 104 may be a low power/small cell WLAN AP.
- eNB evolved Node B
- AP 104 may be a low power/small cell WLAN AP.
- AP 102 may include a Massive Multiple Input Multiple Output (M-MIMO) antenna array that supports highly-directional M-MIMO communication, whereas AP 104 may include only a small number of antennas that enable omni-directional communication only.
- M-MIMO Massive Multiple Input Multiple Output
- UEs 110 a , 110 b , and 110 c are located in a vicinity of APs 102 and 104 .
- any of UEs 110 a , 110 b , and 110 c are within the wireless coverage of any of APs 102 and 104 .
- some of UEs 110 a , 110 b , and 110 c can be within the wireless coverage of only one of APs 102 and 104 .
- UEs 110 a , 110 b , and 110 c can be WLAN user stations (STAs), cellular UEs, Bluetooth devices, and/or other wireless RAT devices.
- STAs WLAN user stations
- cellular UEs cellular UEs
- Bluetooth devices and/or other wireless RAT devices.
- Central access controller 106 is communicatively coupled to APs 102 and 104 .
- central access controller 106 is communicatively coupled directly to APs 102 and 104 via links 108 a and 108 b respectively.
- Links 108 a and 108 b may be wired or wireless.
- links 108 a and 108 b may be optical fiber or microwave links.
- central access controller 106 is communicatively coupled to APs 102 and 104 via one or more intermediate entities.
- central access controller 106 can be coupled to a core network entity (not shown in FIG. 1 ), which is coupled to APs 102 and 104 via a backhaul network (not shown in FIG.
- central access controller 106 is part of AP 102 or AP 104 .
- central access controller 106 is configured to collect AP information associated with APs 102 and 104 and UE information associated with UEs 110 a , 110 b , and 110 c .
- the AP information and the UE information are sent to central access controller 106 from APs 102 and 104 .
- central access controller 106 retrieves the AP information and the UE information via one or more core network entities, coupled to APs 102 and 104 .
- central access controller 106 may eavesdrop on communication within example environment 100 to collect some of the AP information and/or some of the UE information.
- the AP information includes information regarding the capabilities of APs 102 and 104 .
- AP information associated with AP 102 or AP 104 can include, without limitation, information regarding one or more of: a maximum transmit power of the AP, supported RATs at the AP (e.g., LTE, LTE-Advanced, WLAN, Bluetooth, etc.), an antenna configuration of the AP (e.g., number of transmit/receive antennas, omni-directional, fixed sector omni-directional, directional, MIMO, M-MIMO, etc.), M-MIMO communication availability at the AP (e.g., presence/absence of a M-MIMO antenna array, instantaneous usage availability of the M-MIMO antenna array, etc.), capacity of a backhaul link of the AP, and latency of the backhaul link of the AP.
- a maximum transmit power of the AP e.g., supported RATs at the AP (e.g., LTE, LTE-Advanced,
- the UE information includes information associated with one or more of UEs 110 a , 110 b , and 110 c .
- UE information associated with one of UEs 110 a , 110 b , and 110 c can include, without limitation, information regarding one or more of: supported RATs at the UE, an antenna configuration at the UE (e.g., number of transmit/antennas, omni-directional, fixed sector omni-directional, directional, MIMO, M-MIMO, etc.), M-MIMO communication availability at the UE (e.g., presence/absence of a M-MIMO antenna array, instantaneous usage availability of the M-MIMO antenna array, etc.), instantaneous data traffic characteristics of the UE (e.g., number of data streams (i.e., rank) of the UE, data traffic type (e.g., video, voice, etc.), data traffic Quality of Service (QoS) requirements, average uplink/downlink burst size, etc.), a current
- central access controller 106 is configured to generate a channel assignment configuration for at least one of UEs 110 a , 110 b , and 110 c based on the AP information and the UE information. For example, central access controller 106 may generate a channel assignment configuration for UE 110 a . The channel assignment configuration identifies one or more communication channels to be established to serve UE 110 a by APs 102 and/or 104 . Central access controller 106 sends the channel assignment configuration to the AP(s) indicated in the channel assignment configuration. As would be understood by a person of skill in the art based on the teachings herein, central access controller 106 may also generate channel assignment configurations for UEs 110 b and 110 c in the same fashion.
- the channel assignment configuration may identify a first communication channel to be established between AP 102 and UE 110 a and/or a second communication channel to be established between AP 104 and UE 110 a .
- the channel assignment configuration may further identify, for example, the first communication channel as a data channel (e.g., for carrying user data traffic) and the second communication channel as a control channel (e.g., for carrying control information).
- the channel assignment configuration may identify both the first and second communication channels as data channels.
- the channel assignment configuration may identify the first communication channel as a primary data channel and the second communication channel as a secondary data channel.
- the secondary data channel may be used when the primary data channel fails, when the data traffic exceeds the capacity of the primary data channel, or when the data traffic is of a particular type (e.g., video).
- the first communication channel and the second communication channel can be of the same RAT or of different RATs depending on the capabilities of APs 102 and 104 and of UE 110 a .
- the first communication channel may be an LTE channel and the second communication channel may be a WLAN channel, or vice versa.
- the first communication channel utilizes a M-MIMO RAT and the second communication channel utilizes a non-M-MIMO (e.g., legacy) RAT.
- the channel assignment configuration can include a number of parameters related to each of the one or more communication channels to be established. For example, in addition to identifying the communication channel end nodes (e.g., AP 102 and UE 110 a ), the RAT of the communication channel, and the traffic type (e.g., data, control) to be carried over the communication channel, in an embodiment, the channel assignment configuration further identifies the downlink/uplink time and frequency resources associated with the communication channel; the downlink/uplink modulation and coding schemes (MCS) associated with the communication channel; the number(s) of simultaneous (e.g., in time and frequency) downlink/uplink data streams to be carried by the communication channel, the transmit power(s) associated with the communication channel, etc.
- MCS downlink modulation and coding schemes
- Channels as described herein can be defined in time, frequency, and/or spatially.
- a channel can be a logical channel that exists during defined time intervals.
- the channel can exist over a defined frequency subset of a frequency band.
- the channel can be associated with a spatial direction.
- the channel assignment configuration can further include M-MIMO parameters for MIMO communication over the communication channel.
- the M-MIMO parameters can include one or more of: a number of transmit/receive antennas for use in the M-MIMO communication over the communication channel, a selection between Single User MIMO (SU-MIMO) and Multi-User MIMO (MU-MIMO) for the M-MIMO communication (e.g., depending on whether the communication channel is used to serve other UEs simultaneously), a number of users in the case of MU-MIMO, and a transmit precoder for use in the M-MIMO communication over the communication channel.
- SU-MIMO Single User MIMO
- MU-MIMO Multi-User MIMO
- the channel assignment configuration for a particular UE can be statically, semi-statically, or dynamically determined based on the AP information and the UE information.
- central access controller 106 is configured to detect changes in the AP information and/or the UE information and to adjust the channel assignment configuration partially or entirely in response to the detected changes.
- central access controller 106 can be configured to detect a change in the data traffic characteristics of UE 110 a and to generate a second channel assignment configuration for UE 110 a responsive to the detected change.
- the second channel assignment configuration can, for example, identify a third communication channel to be established to serve UE 110 a instead of, or in addition to, the first communication channel.
- the change in the data traffic characteristics of UE 110 a can include a change in traffic type, traffic QoS, and/or traffic statistics.
- the change in the data traffic characteristics of UE 110 a can correspond to an increase in an average burst size of downlink data traffic to UE 110 a .
- the second channel assignment configuration may identify the third communication channel as using a M-MIMO RAT to support the higher burst size downlink data traffic to UE 110 a.
- central access controller 106 can be configured to detect a change in a battery level of UE 110 a and to adjust the M-MIMO parameters of the M-MIMO communication over the first communication channel responsive to the detected change. For example, central access controller 106 may increase the number of transmit antennas used by AP 102 and reduce the number of receive antennas used by UE 110 a for the M-MIMO communication in response to detecting that the battery level of UE 110 a has fallen below a threshold. Alternatively, or additionally, central access controller 106 may reduce or increase the number of data streams carried by the M-MIMO communication.
- Such adjustments can reduce the amount of receive processing required at UE 110 a or reduce the amount of time that UE 110 a spends receiving a given packet and can prolong battery life at UE 110 a .
- Central access controller 106 can decide whether to reduce or increase the number of data streams depending on which option is more beneficial to the UE.
- FIG. 2 illustrates an example central access controller 200 according to an embodiment.
- Example controller 200 is provided for the purpose of illustration only and is not limiting of embodiments.
- Example controller 200 can be an embodiment of central access controller 106 described above.
- example controller 200 includes, without limitation, a processor 202 communicatively coupled to a memory 204 .
- Memory 204 is configured to store, without limitation, AP information 206 , UE information 208 , logic instructions 210 , and assignment heuristics 212 .
- processor 202 is configured to receive AP information and UE information via an input interface 214 and to cause the AP information and UE information to be stored in memory 204 as AP information 206 and UE information 208 respectively.
- input interface 214 is coupled to one or more backhaul links that connect central access controller 200 to one or more respective core network entities.
- processor 202 is configured to execute logic instructions 210 stored in memory 204 to perform the central access controller functions described herein.
- processor 202 can execute logic instructions 210 to generate a channel assignment configuration for a UE based on AP information 206 and/or UE information 208 .
- logic instructions 210 rely on assignment heuristics 212 , which provide heuristics and/or algorithms for generating channel assignment configurations.
- Processor 202 forwards the generated channel assignment configuration via an output interface 216 .
- output interface 216 is coupled to one or more backhaul links that connect central access controller 200 to one or more respective core network entities.
- FIG. 3 illustrates an example process 300 according to an embodiment.
- Example process 300 is provided for the purpose of illustration only and is not limiting of embodiments.
- Example process 300 can be performed by a central access controller, such as central access controller 106 , but can also be performed by a different entity, including an AP.
- Example process 300 can be used to generate and implement a channel assignment configuration for one or more UEs in a region of interest. As would be understood by a person of skill in the art based on the teachings herein, steps 302 and 304 of process 300 can be interchanged or performed simultaneously in other embodiments.
- process 300 begins in step 302 , which includes determining AP information associated with a plurality of APs in the region of interest.
- the AP information may be collected through various ways, including directly from the APs, from one or more core network entities via the backhaul network, or by eavesdropping.
- the AP information includes information regarding the capabilities of the plurality of APs including, without limitation, information regarding one or more of: maximum transmit powers of the APs, supported RATs at the APs (e.g., LTE, LTE-Advanced, WLAN, Bluetooth, etc.), antenna configurations of the APs (e.g., number of transmit/receive antennas, omni-directional, fixed sector omni-directional, directional, MIMO, M-MIMO, etc.), M-MIMO communication availability at the APs (e.g., presence/absence of a M-MIMO antenna array, instantaneous usage availability of the M-MIMO antenna array, etc.), capacity of backhaul links of the APs, and latency of the backhaul links of the APs.
- maximum transmit powers of the APs e.g., supported RATs at the APs (e.g., LTE, LTE-Advanced, WLAN, Bluetooth, etc.)
- antenna configurations of the APs
- process 300 proceeds to step 304 , which includes determining UE information associated with one or more UEs in the region of interest.
- the UE information can also be collected in various ways according to embodiments, including directly from the APs, from one or more core network entities via the backhaul network, or by eavesdropping.
- the UE information includes information associated with the one or more of UEs.
- the information associated with a UE can include, without limitation, information regarding one or more of: supported RATs at the UE, an antenna configuration at the UE (e.g., number of transmit/antennas, omni-directional, fixed sector omni-directional, directional, MIMO, M-MIMO, etc.), M-MIMO communication availability at the UE (e.g., presence/absence of a M-MIMO antenna array, instantaneous usage availability of the M-MIMO antenna array, etc.), instantaneous data traffic characteristics of the UE (e.g., number of data streams (i.e., rank) of the UE, data traffic type (e.g., video, voice, etc.), data traffic Qos requirements, average uplink/downlink burst size, etc.), a current serving AP (or APs) of the UE, a current receive power at the UE due to the current serving AP(s), a current estimate of a downlink channel from the current serving AP(s) to the
- Process 300 then proceeds to step 306 , which includes generating a channel assignment configuration for a UE of the one or more UEs based on the AP information and the UE information.
- the channel assignment configuration can identify any number of communication channels to be established between one or more of the plurality of APs and the UE.
- the channel assignment configuration channel can identify each of the communication channels as a data channel or a control channel, specify the RAT of each of the communication channels, and specify communication parameters related to each of the communication channels.
- process 300 terminates in step 308 , which includes sending the channel assignment configuration to at least one AP of the plurality of APs.
- step 308 includes sending the channel assignment configuration to the AP(s) identified in the channel assignment configuration.
- the channel assignment configuration is shared with all of the plurality of APs.
- the channel assignment configuration is also shared with the UE itself.
- process 300 proceeds to step 310 after step 308 .
- Step 310 includes detecting a change in the AP information and/or the UE information. If no change is detected, process 300 loops back to step 310 , e.g., after a predetermined delay. Otherwise, process 300 returns to step 306 to adjust the channel assignment configuration partially or entirely in response to the detected change.
- Example changes that can trigger an adjustment of the channel assignment configuration e.g., change in the data traffic characteristics of the UE, change in the battery level of the UE, etc.
- example adjustments in response to the changes are described above with reference to FIG. 2 , for the purpose of illustration only and not limitation.
- FIG. 4 illustrates an example AP 400 according to an embodiment.
- Example AP 400 is provided for the purpose of illustration only and is not limiting of embodiments.
- Example AP 400 can be an embodiment of AP 102 or AP 104 for example.
- example AP 400 can be used to support at least two different M-MIMO RATs (e.g., M-MIMO LTE and M-MIMO WLAN) and to implement embodiments as described herein, including implementing a channel assignment configuration provided by a central access controller.
- M-MIMO RATs e.g., M-MIMO LTE and M-MIMO WLAN
- example AP 400 includes, without limitation, a first transmit/receive chain for enabling a first RAT and a second transmit/receive chain for implementing a second RAT.
- the first transmit/receive chain includes, without limitation, a processor 402 , a multi-carrier modulator/demodulator 404 , a radio frequency integrated circuit (RFIC) 406 , a switching module 408 , an antenna array controller 410 , and a M-MIMO antenna array 416 , including a plurality of antenna elements 416 . 0 , 416 . 1 , . . . , 416 . n .
- RFIC radio frequency integrated circuit
- processor 402 includes an embedded memory for storing logic instructions that can be executed by processor 402 to perform the functions described herein.
- the memory is external to processor 402 .
- the first transmit/receive chain can be used to implement a multi-carrier based RAT, such as LTE, for example.
- the second transmit/receive chain is similar to the first transmit/receive chain, and includes, without limitation, a processor 418 , a single carrier modulator/demodulator 420 , a RFIC 422 , a switching module 426 , an antenna array controller 424 , and a M-MIMO antenna array 428 , including a plurality of antenna elements 428 . 0 , 428 . 1 , . . . , 428 . n .
- the second transmit/receive chain can be used to implement a single carrier based RAT, such as WLAN, for example.
- a single M-MIMO antenna array, antenna array controller, switching module, RFIC, modulator/demodulator, and/or processor can be shared across the different RATs.
- AP 400 is configured to receive a channel assignment configuration for a UE in the vicinity of AP 400 .
- the channel assignment configuration can be received using either one or both of the first and second transmit/receive chains.
- AP 400 receives the channel assignment configuration via a backhaul link, not shown in FIG. 4 .
- the channel assignment configuration identifies a first (data) communication channel to be established using the first RAT between AP 400 and the UE, and a second control communication channel to be established using the second RAT between AP 400 and the UE.
- the channel assignment configuration may identify further communication channels to be established by other APs, which would operate similar to AP 400 to establish those channels. For illustration only, it is further assumed that the first communication channel is identified as a M-MIMO communication channel and that the second (control) communication channel is identified as a non-M-MIMO communication channel by the channel assignment configuration.
- AP 400 can be configured to respond to one or more attachment requests from the UE. For example, one or more of the first and second communication channels may require attachment before data/control traffic can be served to the UE. In another embodiment, no attachment is required. In a further embodiment, AP 400 can be configured to instruct the UE to transmit pilot signals for estimating the uplink/downlink channel corresponding to the first communication channel.
- AP 400 can use the first transmit/receive chain to serve downlink data traffic to the UE using M-MIMO communication according to the channel assignment configuration, thereby establishing the first communication channel.
- processor 402 includes a baseband processor which generates one or more (e.g., N) symbol streams (not shown in FIG. 4 ) for transmission by AP 400 over the same time and frequency resources.
- the symbol streams each typically comprises a sequence of modulated symbols.
- the symbol streams can be different from each other. Alternatively, some of the symbol streams can be duplicate.
- the symbol streams are generally intended for one or more UEs (e.g., K UEs) served by AP 400 .
- the UE associated with the received channel assignment configuration may be the intended recipient of one or more or none of the symbol streams transmitted by AP 400 at any given time.
- the symbol stream(s) for the UE result from modulating and/or coding respective bit streams according to modulation and coding schemes identified by the channel assignment configuration.
- AP 400 can be configured to transmit the one or more symbol streams such that the symbol stream(s) intended for the UE associated with the received channel assignment configuration is (are) transmitted over the first communication channel in accordance the channel assignment configuration.
- Other symbol streams are transmitted to other UEs over respective communication channels, which in turn may have been identified by respective channel assignment configurations associated with the other UEs.
- multi-carrier modulator/demodulator 404 includes an Inverse Fast Fourier Transform (IFFT) module and a Fast Fourier Transform (FFT) module.
- IFFT Inverse Fast Fourier Transform
- FFT Fast Fourier Transform
- Multi-carrier modulator/demodulator 404 modulates the symbol streams onto one or more physical resources of a multi-carrier frame (e.g., Orthogonal Frequency Division Multiplexing (OFDM) frame) at the control of processor 402 .
- OFDM Orthogonal Frequency Division Multiplexing
- a multi-carrier frame such as an OFDM frame, corresponds to a grid of physical resources, with each physical resource being associated with a respective time slot (or symbol) and frequency sub-carrier of the multi-carrier frame.
- multi-carrier modulator/demodulator 404 modulates the symbol streams onto physical resources of the multi-carrier frame that correspond to downlink time/frequency resources identified by the channel assignment configuration.
- the symbol streams are modulated onto different physical resources of the multi-carrier frame.
- the symbol streams are modulated onto the same time and frequency physical resources of the multi-carrier frame, but are pre-coded in such a manner that they are transmitted on spatially orthogonal paths by M-MIMO antenna array 416 .
- the pre-coding can be performed by applying a transmit precoder matrix to the symbol streams before multi-carrier modulation and/or by applying a transmit weight vector to the antenna signals prior to transmission.
- the pre-coding can be performed on a physical resource basis, a sub-carrier basis, or a timeslot basis (e.g., OFDM symbol basis).
- the pre-coding is applied in the time domain on a multi-carrier modulated signal.
- processor 402 selects a subset of M-MIMO antenna array 416 (which can be the entire M-MIMO antenna array 416 ) for transmitting the one or more symbol streams.
- the subset of M-MIMO antenna array 416 is identified by the received channel assignment configuration. Based on the size of the selected subset of M-MIMO antenna array 416 and the number of symbol streams being transmitted, processor 402 determines a transmit precoder matrix for pre-coding the one or more symbol streams.
- Processor 402 then pre-codes the one or more symbol streams using the transmit precoder matrix to generate a plurality of signals.
- the plurality of signals can each correspond to an amplitude and/or phase adjusted version of a single symbol stream, or one or more of the plurality of signals can be a weighted combination of the one or more symbol streams.
- processor 402 is configured to determine the transmit precoder matrix based at least in part on the estimate of the downlink channel to the UE associated with the channel assignment configuration.
- processor 402 determines the transmit precoder matrix such that transmission of the plurality of signals by M-MIMO antenna array 416 results in each symbol stream of the one or more symbol streams being beamformed to its intended UE.
- the transmit precoder matrix is provided by the channel assignment configuration to AP 400 .
- the plurality of signals resulting from the pre-coding of the first and second user data symbol streams are provided by processor 402 to multi-carrier modulator/demodulator 404 .
- multi-carrier modulator/demodulator 404 modulates the plurality of signals onto the same time and frequency resources. This is equivalent to having multiple parallel (time and frequency synchronized) OFDM frames, with each signal of the plurality of signals being mapped to one of the multiple parallel OFDM frames such that all signals occupy in their respective OFDM frames the same time and frequency resources.
- the plurality of signals modulated by multi-carrier modulator/demodulator 404 are then provided to RFIC 406 .
- RFIC 406 includes analog hardware circuits and/or components such as filters, frequency up-converters, and power amplifiers.
- RFIC 406 acts on the plurality of signals to generate a respective plurality of carrier-modulated signals.
- the plurality of carrier-modulated signals are then provided to switching module 408 .
- Switching module 408 is controllable by processor 402 by means of a control signal 432 to couple the plurality of carrier-modulated signals to M-MIMO antenna array 416 .
- processor 402 controls switching module 408 to couple the plurality of carrier-modulated signals to respective antenna elements of the selected subset of M-MIMO antenna array 416 .
- switching module 408 couples the plurality of carrier-modulated signals to M-MIMO antenna array 416 via antenna array controller 410 as further described below.
- Antenna array controller 410 is coupled between switching module 408 and M-MIMO antenna array 416 .
- antenna array controller 410 includes a plurality of antenna controllers 410 . 0 , 410 . 1 , . . . , 410 . n that correspond respectively to antenna elements 416 . 0 , 416 . 1 , . . . , 416 . n of M-MIMO antenna array 416 .
- each antenna controller 410 . 0 , 410 . 1 ., . . . , 410 . n includes a respective phase controller 412 and a respective amplitude controller 414 .
- Antenna array controller 410 can be implemented using digital and/or analog components.
- processor 402 controls antenna array controller 410 by means of a control signal 434 .
- processor 402 controls antenna array controller 410 using control signal 434 to activate one or more of antenna controllers 410 . 0 , 410 . 1 , . . . , 410 . n depending on which of antenna elements 416 . 0 , 416 . 1 , . . . , 416 . n is being used for transmission or reception.
- antenna controller 410 when an antenna element 416 . 0 , 416 . 1 , . . . , 416 . n is used for transmission or reception, its corresponding antenna controller 410 . 0 , 410 . 1 , . .
- phase shift can be applied to a signal being transmitted or received by an antenna element 416 . 0 , 416 . 1 , . . . , 416 . n using its respective phase controller 412 . 0 , 412 . 1 , . . . , 412 . n .
- An amplitude amplification/attenuation can be applied to a signal being transmitted or received using an antenna element 416 . 0 , 416 . 1 , . . . , 416 . n using its respective amplitude controller 414 . 0 , 414 . 1 , . . . , 414 . n .
- the phase shift and amplitude amplification/attenuation are applied in the time domain to the signal.
- processor 402 determines, based on one or more of: a desired transmit beam pattern, the downlink channel to the UE, the transmit precoder matrix, and the selected subset of antenna elements used for transmission, a transmit weight vector for antenna array controller 410 .
- the transmit weight vector includes a complex element for each antenna controller 410 . 0 , 410 . 1 , . . . , 410 . n , which determines the respective phase shift and amplitude amplification/attenuation to be applied by the antenna controller to the signal being transmitted by its respective antenna element.
- antenna array controller 410 provides an additional layer for shaping the transmit beam pattern of M-MIMO antenna array 416 , and can be used with or without the above described symbol stream precoding to realize a desired transmit beam pattern using M-MIMO antenna array 416 .
- the desired transmit beam pattern can be, as described above, such that each of the one or more symbol streams is beamformed to its intended UE.
- the plurality of carrier-modulated signals are coupled to respective antenna elements of the selected subset of M-MIMO antenna array 416 and are transmitted.
- the selected subset of M-MIMO antenna array transmits the plurality of carrier-modulated signals on the same time and frequency physical resources as described above.
- processor 418 is configured to generate a symbol stream corresponding to a control bit stream, to be transmitted to the UE associated with the received channel assignment configuration.
- the symbol stream is provided to modulator/demodulator 420 which modulates the symbol stream onto appropriate physical resources associated with the second communication channel.
- the output of modulator/demodulator 420 is then provided to RFIC 422 to generate a carrier-modulated signal.
- switching module 426 and antenna array controller 424 couple the carrier-modulated signal to one or more respective antenna elements of M-MIMO antenna array 428 .
- the antenna element(s) of M-MIMO antenna array 428 used to transmit the carrier-modulated signal are selected to produce an omni-directional or a fixed sector transmit pattern in accordance with the received channel assignment configuration.
- these operations using the second transmit/receive chain can be performed at a same/different time as the operations described above with respect to the first transmit/receive chain.
- AP 400 can be used to support any of the above described channel assignment configuration embodiments.
- AP 400 can be used to implement a channel assignment configuration whereby both the first and the second transmit/receive chains are used to establish data channels with the UE. Further, both data channels can use the same RAT and both can be M-MIMO RATs or non-MIMO RATs.
- one of the data channels can be a primary data channel and the other data channel can be a secondary data channel, where the secondary data channel may be established/used when the primary data channel fails, when the UE's data traffic exceeds the capacity of the primary data channel, or when the UE's data traffic is of a particular type (e.g., video).
- the secondary data channel may be established/used when the primary data channel fails, when the UE's data traffic exceeds the capacity of the primary data channel, or when the UE's data traffic is of a particular type (e.g., video).
- processors 402 and 418 implement different RATs
- communication related parameters can be shared between processors 402 and 418 so as to enable cross-RAT cooperation.
- any type of information available within a given RAT network and which is accessible to AP 400 can be shared between processors 402 and 418 .
- processors 402 and 418 can share such information as the UE's location, uplink/downlink channel estimates, transmit/receive precoders, etc. with each other.
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Abstract
Description
- The application is a continuation of U.S. patent application Ser. No. 14/213,031, filed Mar. 14, 2014, which claims the benefit of U.S. Provisional Application No. 61/811,563, filed Apr. 12, 2013, both of which are incorporated herein by reference in their entireties.
- The present disclosure relates generally to adaptive cross-radio access technology (RAT) channel assignment.
- Future wireless environments are envisioned to include access points (APs) for multiple radio access technologies (RATs) operating in close proximity to each other. These APs may include Massive Multiple Input Multiple Output (M-MIMO) APs equipped with a very large number of transmit/receive antennas (e.g., 32, 64, or 100) that can be used for simultaneous communication with one or more terminals.
- The accompanying drawings, which are incorporated herein and form a part of the specification, illustrate the present disclosure and, together with the description, further serve to explain the principles of the disclosure and to enable a person skilled in the pertinent art to make and use the disclosure.
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FIG. 1 illustrates an example environment in which embodiments can be implemented or practiced. -
FIG. 2 illustrates an example central access controller according to an embodiment. -
FIG. 3 illustrates an example process according to an embodiment. -
FIG. 4 illustrates an example access point according to an embodiment. - The present disclosure will be described with reference to the accompanying drawings. Generally, the drawing in which an element first appears is typically indicated by the leftmost digit(s) in the corresponding reference number.
- For purposes of this discussion, the term “module” shall be understood to include at least one of software, firmware, or hardware (such as one or more circuits, microchips, processors, or devices, or any combination thereof), or any combination thereof. In addition, it will be understood that each module can include one, or more than one, component within an actual device, and each component that forms a part of the described module can function either cooperatively or independently of any other component forming a part of the module. Conversely, multiple modules described herein can represent a single component within an actual device. Further, components within a module can be in a single device or distributed among multiple devices in a wired or wireless manner.
- For the purposes of this discussion, the term “processor circuitry” shall be understood to include one or more: circuit(s), processor(s), or a combination thereof. For example, a circuit can include an analog circuit, a digital circuit, state machine logic, other structural electronic hardware, or a combination thereof. A processor can include a microprocessor, a digital signal processor (DSP), or other hardware processor. The processor can be “hard-coded” with instructions to perform corresponding function(s) according to embodiments described herein. Alternatively, the processor can access an internal or external memory to retrieve instructions stored in the memory, which when executed by the processor, perform the corresponding function(s) associated with the processor.
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FIG. 1 illustrates anexample environment 100 in which embodiments can be implemented or practiced.Example environment 100 is provided for the purpose of illustration only and is not limiting of embodiments. As shown inFIG. 1 ,example environment 100 includes a first Access Point (AP) 102, asecond AP 104, acentral access controller 106, and a plurality of user equipments (UEs) 110 a, 110 b, and 110 c. As would be understood by a person of skill in the art based on the teachings herein, in other embodiments,example environment 100 can include more or less APs and UEs than shown inFIG. 1 . -
APs APs APs APs APs APs - UEs 110 a, 110 b, and 110 c are located in a vicinity of
APs UEs APs UEs APs -
Central access controller 106 is communicatively coupled toAPs central access controller 106 is communicatively coupled directly toAPs links Links central access controller 106 is communicatively coupled toAPs central access controller 106 can be coupled to a core network entity (not shown inFIG. 1 ), which is coupled toAPs FIG. 1 ), or to two core network entities each of which is coupled to a respective one ofAPs 102 and 104 (whenAPs central access controller 106 is part of AP 102 or AP 104. - In an embodiment,
central access controller 106 is configured to collect AP information associated withAPs UEs central access controller 106 fromAPs central access controller 106 retrieves the AP information and the UE information via one or more core network entities, coupled toAPs central access controller 106 may eavesdrop on communication withinexample environment 100 to collect some of the AP information and/or some of the UE information. - In an embodiment, the AP information includes information regarding the capabilities of
APs - The UE information includes information associated with one or more of
UEs UEs - In an embodiment,
central access controller 106 is configured to generate a channel assignment configuration for at least one ofUEs central access controller 106 may generate a channel assignment configuration for UE 110 a. The channel assignment configuration identifies one or more communication channels to be established to serve UE 110 a byAPs 102 and/or 104.Central access controller 106 sends the channel assignment configuration to the AP(s) indicated in the channel assignment configuration. As would be understood by a person of skill in the art based on the teachings herein,central access controller 106 may also generate channel assignment configurations for UEs 110 b and 110 c in the same fashion. - For example, the channel assignment configuration may identify a first communication channel to be established between AP 102 and UE 110 a and/or a second communication channel to be established between AP 104 and UE 110 a. The channel assignment configuration may further identify, for example, the first communication channel as a data channel (e.g., for carrying user data traffic) and the second communication channel as a control channel (e.g., for carrying control information). Alternatively, the channel assignment configuration may identify both the first and second communication channels as data channels. For example, the channel assignment configuration may identify the first communication channel as a primary data channel and the second communication channel as a secondary data channel. In an embodiment, the secondary data channel may be used when the primary data channel fails, when the data traffic exceeds the capacity of the primary data channel, or when the data traffic is of a particular type (e.g., video).
- In embodiments, the first communication channel and the second communication channel can be of the same RAT or of different RATs depending on the capabilities of
APs UE 110 a. For example, the first communication channel may be an LTE channel and the second communication channel may be a WLAN channel, or vice versa. In another example, the first communication channel utilizes a M-MIMO RAT and the second communication channel utilizes a non-M-MIMO (e.g., legacy) RAT. - In an embodiment, the channel assignment configuration can include a number of parameters related to each of the one or more communication channels to be established. For example, in addition to identifying the communication channel end nodes (e.g.,
AP 102 andUE 110 a), the RAT of the communication channel, and the traffic type (e.g., data, control) to be carried over the communication channel, in an embodiment, the channel assignment configuration further identifies the downlink/uplink time and frequency resources associated with the communication channel; the downlink/uplink modulation and coding schemes (MCS) associated with the communication channel; the number(s) of simultaneous (e.g., in time and frequency) downlink/uplink data streams to be carried by the communication channel, the transmit power(s) associated with the communication channel, etc. - Channels as described herein can be defined in time, frequency, and/or spatially. For example, a channel can be a logical channel that exists during defined time intervals. Alternatively or additionally, the channel can exist over a defined frequency subset of a frequency band. Alternatively or additionally, the channel can be associated with a spatial direction.
- In a further embodiment, where the RAT associated with the communication channel is a M-MIMO RAT, the channel assignment configuration can further include M-MIMO parameters for MIMO communication over the communication channel. The M-MIMO parameters can include one or more of: a number of transmit/receive antennas for use in the M-MIMO communication over the communication channel, a selection between Single User MIMO (SU-MIMO) and Multi-User MIMO (MU-MIMO) for the M-MIMO communication (e.g., depending on whether the communication channel is used to serve other UEs simultaneously), a number of users in the case of MU-MIMO, and a transmit precoder for use in the M-MIMO communication over the communication channel.
- In embodiments, the channel assignment configuration for a particular UE can be statically, semi-statically, or dynamically determined based on the AP information and the UE information. Where the channel assignment configuration is semi-statically or dynamically determined,
central access controller 106 is configured to detect changes in the AP information and/or the UE information and to adjust the channel assignment configuration partially or entirely in response to the detected changes. - For example, in an embodiment, where the first communication channel identified in the channel assignment configuration for
UE 110 a corresponds to a data channel,central access controller 106 can be configured to detect a change in the data traffic characteristics ofUE 110 a and to generate a second channel assignment configuration forUE 110 a responsive to the detected change. The second channel assignment configuration can, for example, identify a third communication channel to be established to serveUE 110 a instead of, or in addition to, the first communication channel. The change in the data traffic characteristics ofUE 110 a can include a change in traffic type, traffic QoS, and/or traffic statistics. For example, in an embodiment, the change in the data traffic characteristics ofUE 110 a can correspond to an increase in an average burst size of downlink data traffic toUE 110 a. Accordingly, the second channel assignment configuration may identify the third communication channel as using a M-MIMO RAT to support the higher burst size downlink data traffic toUE 110 a. - In another embodiment, where the first communication channel identified in the channel assignment configuration for
UE 110 a is established using M-MIMO communication betweenAP 102 andUE 110 a,central access controller 106 can be configured to detect a change in a battery level ofUE 110 a and to adjust the M-MIMO parameters of the M-MIMO communication over the first communication channel responsive to the detected change. For example,central access controller 106 may increase the number of transmit antennas used byAP 102 and reduce the number of receive antennas used byUE 110 a for the M-MIMO communication in response to detecting that the battery level ofUE 110 a has fallen below a threshold. Alternatively, or additionally,central access controller 106 may reduce or increase the number of data streams carried by the M-MIMO communication. Such adjustments can reduce the amount of receive processing required atUE 110 a or reduce the amount of time that UE 110 a spends receiving a given packet and can prolong battery life atUE 110 a.Central access controller 106 can decide whether to reduce or increase the number of data streams depending on which option is more beneficial to the UE. -
FIG. 2 illustrates an examplecentral access controller 200 according to an embodiment.Example controller 200 is provided for the purpose of illustration only and is not limiting of embodiments.Example controller 200 can be an embodiment ofcentral access controller 106 described above. As shown inFIG. 2 ,example controller 200 includes, without limitation, aprocessor 202 communicatively coupled to amemory 204.Memory 204 is configured to store, without limitation,AP information 206,UE information 208,logic instructions 210, andassignment heuristics 212. - In an embodiment,
processor 202 is configured to receive AP information and UE information via aninput interface 214 and to cause the AP information and UE information to be stored inmemory 204 asAP information 206 andUE information 208 respectively. In one embodiment,input interface 214 is coupled to one or more backhaul links that connectcentral access controller 200 to one or more respective core network entities. - In another embodiment,
processor 202 is configured to executelogic instructions 210 stored inmemory 204 to perform the central access controller functions described herein. For example, in an embodiment,processor 202 can executelogic instructions 210 to generate a channel assignment configuration for a UE based onAP information 206 and/orUE information 208. In one embodiment,logic instructions 210 rely onassignment heuristics 212, which provide heuristics and/or algorithms for generating channel assignment configurations.Processor 202 forwards the generated channel assignment configuration via anoutput interface 216. In an embodiment,output interface 216 is coupled to one or more backhaul links that connectcentral access controller 200 to one or more respective core network entities. -
FIG. 3 illustrates anexample process 300 according to an embodiment.Example process 300 is provided for the purpose of illustration only and is not limiting of embodiments.Example process 300 can be performed by a central access controller, such ascentral access controller 106, but can also be performed by a different entity, including an AP.Example process 300 can be used to generate and implement a channel assignment configuration for one or more UEs in a region of interest. As would be understood by a person of skill in the art based on the teachings herein, steps 302 and 304 ofprocess 300 can be interchanged or performed simultaneously in other embodiments. - As shown in
FIG. 3 ,process 300 begins instep 302, which includes determining AP information associated with a plurality of APs in the region of interest. As described above, the AP information may be collected through various ways, including directly from the APs, from one or more core network entities via the backhaul network, or by eavesdropping. In an embodiment, the AP information includes information regarding the capabilities of the plurality of APs including, without limitation, information regarding one or more of: maximum transmit powers of the APs, supported RATs at the APs (e.g., LTE, LTE-Advanced, WLAN, Bluetooth, etc.), antenna configurations of the APs (e.g., number of transmit/receive antennas, omni-directional, fixed sector omni-directional, directional, MIMO, M-MIMO, etc.), M-MIMO communication availability at the APs (e.g., presence/absence of a M-MIMO antenna array, instantaneous usage availability of the M-MIMO antenna array, etc.), capacity of backhaul links of the APs, and latency of the backhaul links of the APs. - Subsequently,
process 300 proceeds to step 304, which includes determining UE information associated with one or more UEs in the region of interest. Like the AP information, the UE information can also be collected in various ways according to embodiments, including directly from the APs, from one or more core network entities via the backhaul network, or by eavesdropping. In an embodiment, the UE information includes information associated with the one or more of UEs. The information associated with a UE can include, without limitation, information regarding one or more of: supported RATs at the UE, an antenna configuration at the UE (e.g., number of transmit/antennas, omni-directional, fixed sector omni-directional, directional, MIMO, M-MIMO, etc.), M-MIMO communication availability at the UE (e.g., presence/absence of a M-MIMO antenna array, instantaneous usage availability of the M-MIMO antenna array, etc.), instantaneous data traffic characteristics of the UE (e.g., number of data streams (i.e., rank) of the UE, data traffic type (e.g., video, voice, etc.), data traffic Qos requirements, average uplink/downlink burst size, etc.), a current serving AP (or APs) of the UE, a current receive power at the UE due to the current serving AP(s), a current estimate of a downlink channel from the current serving AP(s) to the UE, a location of the UE (e.g., GPS location or approximate location based on current serving AP), and a battery level of the UE. -
Process 300 then proceeds to step 306, which includes generating a channel assignment configuration for a UE of the one or more UEs based on the AP information and the UE information. As described above, the channel assignment configuration can identify any number of communication channels to be established between one or more of the plurality of APs and the UE. The channel assignment configuration channel can identify each of the communication channels as a data channel or a control channel, specify the RAT of each of the communication channels, and specify communication parameters related to each of the communication channels. - In an embodiment,
process 300 terminates instep 308, which includes sending the channel assignment configuration to at least one AP of the plurality of APs. In an embodiment,step 308 includes sending the channel assignment configuration to the AP(s) identified in the channel assignment configuration. In another embodiment, the channel assignment configuration is shared with all of the plurality of APs. In a further embodiment, the channel assignment configuration is also shared with the UE itself. - In another embodiment,
process 300 proceeds to step 310 afterstep 308. Step 310 includes detecting a change in the AP information and/or the UE information. If no change is detected, process 300 loops back to step 310, e.g., after a predetermined delay. Otherwise,process 300 returns to step 306 to adjust the channel assignment configuration partially or entirely in response to the detected change. Example changes that can trigger an adjustment of the channel assignment configuration (e.g., change in the data traffic characteristics of the UE, change in the battery level of the UE, etc.) and example adjustments in response to the changes are described above with reference toFIG. 2 , for the purpose of illustration only and not limitation. -
FIG. 4 illustrates anexample AP 400 according to an embodiment.Example AP 400 is provided for the purpose of illustration only and is not limiting of embodiments.Example AP 400 can be an embodiment ofAP 102 orAP 104 for example. In an embodiment,example AP 400 can be used to support at least two different M-MIMO RATs (e.g., M-MIMO LTE and M-MIMO WLAN) and to implement embodiments as described herein, including implementing a channel assignment configuration provided by a central access controller. - As shown in
FIG. 4 ,example AP 400 includes, without limitation, a first transmit/receive chain for enabling a first RAT and a second transmit/receive chain for implementing a second RAT. The first transmit/receive chain includes, without limitation, aprocessor 402, a multi-carrier modulator/demodulator 404, a radio frequency integrated circuit (RFIC) 406, aswitching module 408, anantenna array controller 410, and a M-MIMO antenna array 416, including a plurality of antenna elements 416.0, 416.1, . . . , 416.n. In an embodiment,processor 402 includes an embedded memory for storing logic instructions that can be executed byprocessor 402 to perform the functions described herein. In another embodiment, the memory is external toprocessor 402. In an embodiment, the first transmit/receive chain can be used to implement a multi-carrier based RAT, such as LTE, for example. - The second transmit/receive chain is similar to the first transmit/receive chain, and includes, without limitation, a
processor 418, a single carrier modulator/demodulator 420, aRFIC 422, aswitching module 426, anantenna array controller 424, and a M-MIMO antenna array 428, including a plurality of antenna elements 428.0, 428.1, . . . , 428.n. In an embodiment, the second transmit/receive chain can be used to implement a single carrier based RAT, such as WLAN, for example. As would be understood by a person of skill in the art based on the teachings herein, in other embodiments, some of the components ofAP 400 can be reused across different RATs and can therefore be eliminated. For example, in an embodiment, a single M-MIMO antenna array, antenna array controller, switching module, RFIC, modulator/demodulator, and/or processor can be shared across the different RATs. - In an embodiment,
AP 400 is configured to receive a channel assignment configuration for a UE in the vicinity ofAP 400. The channel assignment configuration can be received using either one or both of the first and second transmit/receive chains. Alternatively,AP 400 receives the channel assignment configuration via a backhaul link, not shown inFIG. 4 . For the purpose of illustration only, it is assumed herein that the channel assignment configuration identifies a first (data) communication channel to be established using the first RAT betweenAP 400 and the UE, and a second control communication channel to be established using the second RAT betweenAP 400 and the UE. As would be understood by a person of skill in the art based on the teachings herein, the channel assignment configuration may identify further communication channels to be established by other APs, which would operate similar toAP 400 to establish those channels. For illustration only, it is further assumed that the first communication channel is identified as a M-MIMO communication channel and that the second (control) communication channel is identified as a non-M-MIMO communication channel by the channel assignment configuration. - After receiving the channel assignment configuration,
AP 400 can be configured to respond to one or more attachment requests from the UE. For example, one or more of the first and second communication channels may require attachment before data/control traffic can be served to the UE. In another embodiment, no attachment is required. In a further embodiment,AP 400 can be configured to instruct the UE to transmit pilot signals for estimating the uplink/downlink channel corresponding to the first communication channel. - In an embodiment, once
AP 400 obtains an estimate of the downlink channel to the UE,AP 400 can use the first transmit/receive chain to serve downlink data traffic to the UE using M-MIMO communication according to the channel assignment configuration, thereby establishing the first communication channel. - In an embodiment,
processor 402 includes a baseband processor which generates one or more (e.g., N) symbol streams (not shown inFIG. 4 ) for transmission byAP 400 over the same time and frequency resources. The symbol streams each typically comprises a sequence of modulated symbols. The symbol streams can be different from each other. Alternatively, some of the symbol streams can be duplicate. The symbol streams are generally intended for one or more UEs (e.g., K UEs) served byAP 400. - The UE associated with the received channel assignment configuration may be the intended recipient of one or more or none of the symbol streams transmitted by
AP 400 at any given time. In an embodiment, the symbol stream(s) for the UE result from modulating and/or coding respective bit streams according to modulation and coding schemes identified by the channel assignment configuration. As further described below, in an embodiment,AP 400 can be configured to transmit the one or more symbol streams such that the symbol stream(s) intended for the UE associated with the received channel assignment configuration is (are) transmitted over the first communication channel in accordance the channel assignment configuration. Other symbol streams are transmitted to other UEs over respective communication channels, which in turn may have been identified by respective channel assignment configurations associated with the other UEs. - The one or more symbol streams are provided to multi-carrier modulator/
demodulator 404. In an embodiment, multi-carrier modulator/demodulator 404 includes an Inverse Fast Fourier Transform (IFFT) module and a Fast Fourier Transform (FFT) module. Multi-carrier modulator/demodulator 404 modulates the symbol streams onto one or more physical resources of a multi-carrier frame (e.g., Orthogonal Frequency Division Multiplexing (OFDM) frame) at the control ofprocessor 402. As understood by a person of skill in the art, a multi-carrier frame, such as an OFDM frame, corresponds to a grid of physical resources, with each physical resource being associated with a respective time slot (or symbol) and frequency sub-carrier of the multi-carrier frame. - In an embodiment, multi-carrier modulator/
demodulator 404 modulates the symbol streams onto physical resources of the multi-carrier frame that correspond to downlink time/frequency resources identified by the channel assignment configuration. In an embodiment, the symbol streams are modulated onto different physical resources of the multi-carrier frame. In another embodiment, the symbol streams are modulated onto the same time and frequency physical resources of the multi-carrier frame, but are pre-coded in such a manner that they are transmitted on spatially orthogonal paths by M-MIMO antenna array 416. As further described below, in embodiments, the pre-coding can be performed by applying a transmit precoder matrix to the symbol streams before multi-carrier modulation and/or by applying a transmit weight vector to the antenna signals prior to transmission. In the former case, the pre-coding can be performed on a physical resource basis, a sub-carrier basis, or a timeslot basis (e.g., OFDM symbol basis). In the latter case, the pre-coding is applied in the time domain on a multi-carrier modulated signal. - In an embodiment,
processor 402 selects a subset of M-MIMO antenna array 416 (which can be the entire M-MIMO antenna array 416) for transmitting the one or more symbol streams. In an embodiment, the subset of M-MIMO antenna array 416 is identified by the received channel assignment configuration. Based on the size of the selected subset of M-MIMO antenna array 416 and the number of symbol streams being transmitted,processor 402 determines a transmit precoder matrix for pre-coding the one or more symbol streams. -
Processor 402 then pre-codes the one or more symbol streams using the transmit precoder matrix to generate a plurality of signals. Depending on the actual values of the transmit precoder matrix, the plurality of signals can each correspond to an amplitude and/or phase adjusted version of a single symbol stream, or one or more of the plurality of signals can be a weighted combination of the one or more symbol streams. In an embodiment,processor 402 is configured to determine the transmit precoder matrix based at least in part on the estimate of the downlink channel to the UE associated with the channel assignment configuration. In another embodiment,processor 402 determines the transmit precoder matrix such that transmission of the plurality of signals by M-MIMO antenna array 416 results in each symbol stream of the one or more symbol streams being beamformed to its intended UE. In a further embodiment, the transmit precoder matrix is provided by the channel assignment configuration toAP 400. - The plurality of signals resulting from the pre-coding of the first and second user data symbol streams are provided by
processor 402 to multi-carrier modulator/demodulator 404. In an embodiment, as described above, multi-carrier modulator/demodulator 404 modulates the plurality of signals onto the same time and frequency resources. This is equivalent to having multiple parallel (time and frequency synchronized) OFDM frames, with each signal of the plurality of signals being mapped to one of the multiple parallel OFDM frames such that all signals occupy in their respective OFDM frames the same time and frequency resources. - The plurality of signals modulated by multi-carrier modulator/
demodulator 404 are then provided toRFIC 406.RFIC 406 includes analog hardware circuits and/or components such as filters, frequency up-converters, and power amplifiers.RFIC 406 acts on the plurality of signals to generate a respective plurality of carrier-modulated signals. The plurality of carrier-modulated signals are then provided to switchingmodule 408.Switching module 408 is controllable byprocessor 402 by means of acontrol signal 432 to couple the plurality of carrier-modulated signals to M-MIMO antenna array 416. In an embodiment,processor 402controls switching module 408 to couple the plurality of carrier-modulated signals to respective antenna elements of the selected subset of M-MIMO antenna array 416. In an embodiment, switchingmodule 408 couples the plurality of carrier-modulated signals to M-MIMO antenna array 416 viaantenna array controller 410 as further described below. -
Antenna array controller 410 is coupled betweenswitching module 408 and M-MIMO antenna array 416. In an embodiment,antenna array controller 410 includes a plurality of antenna controllers 410.0, 410.1, . . . , 410.n that correspond respectively to antenna elements 416.0, 416.1, . . . , 416.n of M-MIMO antenna array 416. In an embodiment, each antenna controller 410.0, 410.1., . . . , 410.n includes a respective phase controller 412 and a respective amplitude controller 414.Antenna array controller 410 can be implemented using digital and/or analog components. - In an embodiment,
processor 402 controlsantenna array controller 410 by means of acontrol signal 434. In another embodiment,processor 402 controlsantenna array controller 410 usingcontrol signal 434 to activate one or more of antenna controllers 410.0, 410.1, . . . , 410.n depending on which of antenna elements 416.0, 416.1, . . . , 416.n is being used for transmission or reception. In an embodiment, when an antenna element 416.0, 416.1, . . . , 416.n is used for transmission or reception, its corresponding antenna controller 410.0, 410.1, . . . , 410.n is active. A phase shift can be applied to a signal being transmitted or received by an antenna element 416.0, 416.1, . . . , 416.n using its respective phase controller 412.0, 412.1, . . . , 412.n. An amplitude amplification/attenuation can be applied to a signal being transmitted or received using an antenna element 416.0, 416.1, . . . , 416.n using its respective amplitude controller 414.0, 414.1, . . . , 414.n. In an embodiment, the phase shift and amplitude amplification/attenuation are applied in the time domain to the signal. - In an embodiment,
processor 402 determines, based on one or more of: a desired transmit beam pattern, the downlink channel to the UE, the transmit precoder matrix, and the selected subset of antenna elements used for transmission, a transmit weight vector forantenna array controller 410. In an embodiment, the transmit weight vector includes a complex element for each antenna controller 410.0, 410.1, . . . , 410.n, which determines the respective phase shift and amplitude amplification/attenuation to be applied by the antenna controller to the signal being transmitted by its respective antenna element. Hence, as described above,antenna array controller 410 provides an additional layer for shaping the transmit beam pattern of M-MIMO antenna array 416, and can be used with or without the above described symbol stream precoding to realize a desired transmit beam pattern using M-MIMO antenna array 416. The desired transmit beam pattern can be, as described above, such that each of the one or more symbol streams is beamformed to its intended UE. - After processing by
antenna array controller 410, the plurality of carrier-modulated signals are coupled to respective antenna elements of the selected subset of M-MIMO antenna array 416 and are transmitted. In an embodiment, the selected subset of M-MIMO antenna array transmits the plurality of carrier-modulated signals on the same time and frequency physical resources as described above. - Implementing the second data channel using the second transmit/receive chain of
AP 400 is similar to implementing the first communication channel using the first transmit/receive chain as described above. Briefly, in an embodiment,processor 418 is configured to generate a symbol stream corresponding to a control bit stream, to be transmitted to the UE associated with the received channel assignment configuration. The symbol stream is provided to modulator/demodulator 420 which modulates the symbol stream onto appropriate physical resources associated with the second communication channel. The output of modulator/demodulator 420 is then provided toRFIC 422 to generate a carrier-modulated signal. At the control ofprocessor 418 via control signals 436 and 438 respectively, switchingmodule 426 andantenna array controller 424 couple the carrier-modulated signal to one or more respective antenna elements of M-MIMO antenna array 428. In an embodiment, the antenna element(s) of M-MIMO antenna array 428 used to transmit the carrier-modulated signal are selected to produce an omni-directional or a fixed sector transmit pattern in accordance with the received channel assignment configuration. As would be understood by a person of skill in the art based on the teachings herein, these operations using the second transmit/receive chain can be performed at a same/different time as the operations described above with respect to the first transmit/receive chain. - As would be understood by a person of skill in the art based on the teachings, the above operation description of
AP 400 corresponds to one example scenario according to embodiments and is provided for the purpose of illustration only. A myriad of other communication scenarios can be implemented usingAP 400 according to embodiments. For example,AP 400 can be used to support any of the above described channel assignment configuration embodiments. For example, as would be apparent to a person of skill in the art,AP 400 can be used to implement a channel assignment configuration whereby both the first and the second transmit/receive chains are used to establish data channels with the UE. Further, both data channels can use the same RAT and both can be M-MIMO RATs or non-MIMO RATs. In addition, in some embodiments, one of the data channels can be a primary data channel and the other data channel can be a secondary data channel, where the secondary data channel may be established/used when the primary data channel fails, when the UE's data traffic exceeds the capacity of the primary data channel, or when the UE's data traffic is of a particular type (e.g., video). - In other embodiments, where
processors processors AP 400 can be shared betweenprocessors processors - Embodiments have been described above with the aid of functional building blocks illustrating the implementation of specified functions and relationships thereof. The boundaries of these functional building blocks have been arbitrarily defined herein for the convenience of the description. Alternate boundaries can be defined so long as the specified functions and relationships thereof are appropriately performed.
- The foregoing description of the specific embodiments will so fully reveal the general nature of the disclosure that others can, by applying knowledge within the skill of the art, readily modify and/or adapt for various applications such specific embodiments, without undue experimentation, without departing from the general concept of the present disclosure. Therefore, such adaptations and modifications are intended to be within the meaning and range of equivalents of the disclosed embodiments, based on the teaching and guidance presented herein. It is to be understood that the phraseology or terminology herein is for the purpose of description and not of limitation, such that the terminology or phraseology of the present specification is to be interpreted by the skilled artisan in light of the teachings and guidance.
- The breadth and scope of embodiments of the present disclosure should not be limited by any of the above-described exemplary embodiments as other embodiments will be apparent to a person of skill in the art based on the teachings herein.
Claims (21)
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US9467999B2 (en) | 2016-10-11 |
US20140307819A1 (en) | 2014-10-16 |
US20140307818A1 (en) | 2014-10-16 |
US9125081B2 (en) | 2015-09-01 |
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