Patent Application
20110249603
This disclosure relates generally to apparatus and methods for wireless service coexistence. More particularly, the disclosure relates to multiple wireless service coexistence.
In many telecommunication systems, communications networks are used to exchange messages among several interacting elements which are spatially separated. Communication networks may be classified in different aspects. In one example, the geographic scope of the network could be over a wide area, a metropolitan area, a local area, or a personal area, and the corresponding networks would be designated as wide area network (WAN), metropolitan area network (MAN), local area network (LAN), or personal area network (PAN). Networks also differ in the switching/routing technique used to interconnect the various network nodes and devices (e.g. circuit switching vs. packet switching), in the type of physical media employed for waveform propagation (e.g. wired vs. wireless), or in the set of communication protocols used (e.g. Internet protocol suite, SONET (Synchronous Optical Networking), Ethernet, etc.).
Disclosed is an apparatus and method for multiple wireless service coexistence. According to one aspect, a method for multiple wireless service coexistence comprising engaging a first switch to connect a first service transmitter to an antenna through a first filter path and to disconnect a first service receiver from the antenna; engaging a second switch to connect a second service receiver to the antenna through a second filter path and to disconnect a second service transmitter from the antenna; enabling transmit power control on the first service transmitter; and performing one or both of the following: a) transmitting a first service transmit signal through the first filter path to the antenna with high rejection of the band of a second service; b) receiving a second service receive signal through the second filter path from the antenna with high rejection of the band of a first service.
According to another aspect, a method for multiple wireless service coexistence comprising engaging a first switch to connect a first service transmitter to an antenna through a first filter path and to disconnect a first service receiver from the antenna; engaging a second switch to connect a second service transmitter to the antenna through a second filter path and to disconnect a second service receiver from the antenna; performing one or both of the following: a) transmitting a first service transmit signal through the first filter path to the antenna with high rejection of the band of a second service; b) transmitting a second service transmit signal through the second filter path from the antenna with high rejection of the band of a first service.
According to another aspect, a method for multiple wireless service coexistence comprising engaging a first switch to connect a first service receiver to an antenna through a first filter path and to disconnect a first service transmitter from the antenna; engaging a second switch to connect a second service receiver to the antenna through a second filter path and to disconnect a second service transmitter from the antenna; performing one or both of the following: a) receiving a first service receive signal through the first filter path to the antenna with high rejection of the band of a second service; b) receiving a second service receive signal through the second filter path from the antenna with high rejection of the band of a first service.
According to another aspect, a method for multiple wireless service coexistence comprising engaging one or more switching devices to perform the following: a) connecting a first service transmitter to a first antenna; b) disconnecting a dual mode receiver from the first antenna; c) disconnecting a second service transmitter from the first antenna; d) disconnecting the second service transmitter from a second antenna; e) connecting a diversity receiver to the second antenna; transmitting a first service transmit signal in a first service using the first antenna; and receiving a second service receive signal in a second service using the second antenna and the diversity receiver.
According to another aspect, a method for multiple wireless service coexistence comprising engaging one or more switching devices to perform the following: a) disconnecting a first service transmitter from a first antenna; b) connecting a dual mode receiver to the first antenna; c) disconnecting a second service transmitter from the first antenna; d) connecting the second service transmitter to a second antenna; e) disconnecting a diversity receiver from the second antenna; receiving a first service receive signal in a first service using the first antenna and the dual mode receiver; and transmitting a second service transmit signal in a second service using the second antenna.
According to another aspect, a method for multiple wireless service coexistence comprising engaging one or more switching devices to perform the following: a) connecting a first service transmitter to a first antenna; b) disconnecting a dual mode receiver from the first antenna; c) disconnecting a second service transmitter from the first antenna; d) connecting the second service transmitter to a second antenna; e) disconnecting a diversity receiver from the second antenna; transmitting a first service transmit signal in a first service using the first antenna; and transmitting a second service transmit signal in a second service using the second antenna.
According to another aspect, a method for multiple wireless service coexistence comprising engaging one or more switching devices to perform the following: a) disconnecting a first service transmitter from a first antenna; b) connecting a dual mode receiver to the first antenna; c) disconnecting a second service transmitter from the first antenna; d) disconnecting the second service transmitter from a second antenna; e) connecting a diversity receiver to the second antenna; receiving a first service receive signal in a first service using the first antenna and the dual mode receiver; and receiving a second service receive signal in a second service using the second antenna and the diversity receiver.
According to another aspect, an apparatus for multiple wireless service coexistence comprising means for engaging a first switch to connect a first service transmitter to an antenna through a first filter path and to disconnect a first service receiver from the antenna; means for engaging a second switch to connect a second service receiver to the antenna through a second filter path and to disconnect a second service transmitter from the antenna; means for enabling transmit power control on the first service transmitter; and means for performing one or both of the following: a) transmitting a first service transmit signal through the first filter path to the antenna with high rejection of the band of a second service; b) receiving a second service receive signal through the second filter path from the antenna with high rejection of the band of a first service.
According to another aspect, an apparatus for multiple wireless service coexistence comprising: means for engaging a first switch to connect a first service transmitter to an antenna through a first filter path and to disconnect a first service receiver from the antenna; means for engaging a second switch to connect a second service transmitter to the antenna through a second filter path and to disconnect a second service receiver from the antenna; means for performing one or both of the following: a) transmitting a first service transmit signal through the first filter path to the antenna with high rejection of the band of a second service; b) transmitting a second service transmit signal through the second filter path from the antenna with high rejection of the band of a first service.
According to another aspect, an apparatus for multiple wireless service coexistence comprising means for engaging a first switch to connect a first service receiver to an antenna through a first filter path and to disconnect a first service transmitter from the antenna; means for engaging a second switch to connect a second service receiver to the antenna through a second filter path and to disconnect a second service transmitter from the antenna; means for performing one or both of the following: a) receiving a first service receive signal through the first filter path to the antenna with high rejection of the band of a second service; b) receiving a second service receive signal through the second filter path from the antenna with high rejection of the band of a first service.
According to another aspect, an apparatus for multiple wireless service coexistence comprising means for engaging one or more switching devices to perform the following: a) connecting a first service transmitter to a first antenna; b) disconnecting a dual mode receiver from the first antenna; c) disconnecting a second service transmitter from the first antenna; d) disconnecting the second service transmitter from a second antenna; e) connecting a diversity receiver to the second antenna; means for transmitting a first service transmit signal in a first service using the first antenna; and means for receiving a second service receive signal in a second service using the second antenna and the diversity receiver.
According to another aspect, an apparatus for multiple wireless service coexistence comprising means for engaging one or more switching devices to perform the following: a) disconnecting a first service transmitter from a first antenna; b) connecting a dual mode receiver to the first antenna; c) disconnecting a second service transmitter from the first antenna; d) connecting the second service transmitter to a second antenna; e) disconnecting a diversity receiver from the second antenna; means for receiving a first service receive signal in a first service using the first antenna and the dual mode receiver; and means for transmitting a second service transmit signal in a second service using the second antenna.
According to another aspect, an apparatus for multiple wireless service coexistence comprising means for engaging one or more switching devices to perform the following: a) connecting a first service transmitter to a first antenna; b) disconnecting a dual mode receiver from the first antenna; c) disconnecting a second service transmitter from the first antenna; d) connecting the second service transmitter to a second antenna; e) disconnecting a diversity receiver from the second antenna; means for transmitting a first service transmit signal in a first service using the first antenna; and means for transmitting a second service transmit signal in a second service using the second antenna.
According to another aspect, an apparatus for multiple wireless service coexistence comprising means for engaging one or more switching devices to perform the following: a) disconnecting a first service transmitter from a first antenna; b) connecting a dual mode receiver to the first antenna; c) disconnecting a second service transmitter from the first antenna; d) disconnecting the second service transmitter from a second antenna; e) connecting a diversity receiver to the second antenna; means for receiving a first service receive signal in a first service using the first antenna and the dual mode receiver; and means for receiving a second service receive signal in a second service using the second antenna and the diversity receiver.
According to another aspect, an apparatus comprising a processor and a memory, the memory containing program code executable by the processor for performing the following: engaging a first switch to connect a first service transmitter to an antenna through a first filter path and to disconnect a first service receiver from the antenna; engaging a second switch to connect a second service receiver to the antenna through a second filter path and to disconnect a second service transmitter from the antenna; enabling transmit power control on the first service transmitter; and performing one or both of the following: a) transmitting a first service transmit signal through the first filter path to the antenna with high rejection of the band of a second service; b) receiving a second service receive signal through the second filter path from the antenna with high rejection of the band of a first service.
According to another aspect, an apparatus comprising a processor and a memory, the memory containing program code executable by the processor for performing the following: engaging a first switch to connect a first service transmitter to an antenna through a first filter path and to disconnect a first service receiver from the antenna; engaging a second switch to connect a second service transmitter to the antenna through a second filter path and to disconnect a second service receiver from the antenna; performing one or both of the following: a) transmitting a first service transmit signal through the first filter path to the antenna with high rejection of the band of a second service; b) transmitting a second service transmit signal through the second filter path from the antenna with high rejection of the band of a first service.
According to another aspect, an apparatus comprising a processor and a memory, the memory containing program code executable by the processor for performing the following: engaging a first switch to connect a first service receiver to an antenna through a first filter path and to disconnect a first service transmitter from the antenna; engaging a second switch to connect a second service receiver to the antenna through a second filter path and to disconnect a second service transmitter from the antenna; performing one or both of the following: a) receiving a first service receive signal through the first filter path to the antenna with high rejection of the band of a second service; b) receiving a second service receive signal through the second filter path from the antenna with high rejection of the band of a first service.
According to another aspect, an apparatus comprising a processor and a memory, the memory containing program code executable by the processor for performing the following engaging one or more switching devices to perform the following: a) connecting a first service transmitter to a first antenna; b) disconnecting a dual mode receiver from the first antenna; c) disconnecting a second service transmitter from the first antenna; d) disconnecting the second service transmitter from a second antenna; e) connecting a diversity receiver to the second antenna; transmitting a first service transmit signal in a first service using the first antenna; and receiving a second service receive signal in a second service using the second antenna and the diversity receiver.
According to another aspect, an apparatus comprising a processor and a memory, the memory containing program code executable by the processor for performing the following engaging one or more switching devices to perform the following: a) disconnecting a first service transmitter from a first antenna; b) connecting a dual mode receiver to the first antenna; c) disconnecting a second service transmitter from the first antenna; d) connecting the second service transmitter to a second antenna; e) disconnecting a diversity receiver from the second antenna; receiving a first service receive signal in a first service using the first antenna and the dual mode receiver; and transmitting a second service transmit signal in a second service using the second antenna.
According to another aspect, an apparatus comprising a processor and a memory, the memory containing program code executable by the processor for performing the following engaging one or more switching devices to perform the following: a) connecting a first service transmitter to a first antenna; b) disconnecting a dual mode receiver from the first antenna; c) disconnecting a second service transmitter from the first antenna; d) connecting the second service transmitter to a second antenna; e) disconnecting a diversity receiver from the second antenna; transmitting a first service transmit signal in a first service using the first antenna; and transmitting a second service transmit signal in a second service using the second antenna.
According to another aspect, an apparatus comprising a processor and a memory, the memory containing program code executable by the processor for performing the following engaging one or more switching devices to perform the following: a) disconnecting a first service transmitter from a first antenna; b) connecting a dual mode receiver to the first antenna; c) disconnecting a second service transmitter from the first antenna; d) disconnecting the second service transmitter from a second antenna; e) connecting a diversity receiver to the second antenna; receiving a first service receive signal in a first service using the first antenna and the dual mode receiver; and receiving a second service receive signal in a second service using the second antenna and the diversity receiver.
According to another aspect, an computer-readable medium storing a computer program, wherein execution of the computer program is for engaging a first switch to connect a first service transmitter to an antenna through a first filter path and to disconnect a first service receiver from the antenna; engaging a second switch to connect a second service receiver to the antenna through a second filter path and to disconnect a second service transmitter from the antenna; enabling transmit power control on the first service transmitter; and performing one or both of the following: a) transmitting a first service transmit signal through the first filter path to the antenna with high rejection of the band of a second service; b) receiving a second service receive signal through the second filter path from the antenna with high rejection of the band of a first service.
According to another aspect, a computer-readable medium storing a computer program, wherein execution of the computer program is for engaging a first switch to connect a first service transmitter to an antenna through a first filter path and to disconnect a first service receiver from the antenna; engaging a second switch to connect a second service transmitter to the antenna through a second filter path and to disconnect a second service receiver from the antenna; performing one or both of the following: a) transmitting a first service transmit signal through the first filter path to the antenna with high rejection of the band of a second service; b) transmitting a second service transmit signal through the second filter path from the antenna with high rejection of the band of a first service.
According to another aspect, a computer-readable medium storing a computer program, wherein execution of the computer program is for engaging a first switch to connect a first service receiver to an antenna through a first filter path and to disconnect a first service transmitter from the antenna; engaging a second switch to connect a second service receiver to the antenna through a second filter path and to disconnect a second service transmitter from the antenna; performing one or both of the following: a) receiving a first service receive signal through the first filter path to the antenna with high rejection of the band of a second service; b) receiving a second service receive signal through the second filter path from the antenna with high rejection of the band of a first service.
According to another aspect, a computer-readable medium storing a computer program, wherein execution of the computer program is for engaging one or more switching devices to perform the following: a) connecting a first service transmitter to a first antenna; b) disconnecting a dual mode receiver from the first antenna; c) disconnecting a second service transmitter from the first antenna; d) disconnecting the second service transmitter from a second antenna; e) connecting a diversity receiver to the second antenna; transmitting a first service transmit signal in a first service using the first antenna; and receiving a second service receive signal in a second service using the second antenna and the diversity receiver.
According to another aspect, a computer-readable medium storing a computer program, wherein execution of the computer program is for engaging one or more switching devices to perform the following: a) disconnecting a first service transmitter from a first antenna; b) connecting a dual mode receiver to the first antenna; c) disconnecting a second service transmitter from the first antenna; d) connecting the second service transmitter to a second antenna; e) disconnecting a diversity receiver from the second antenna; receiving a first service receive signal in a first service using the first antenna and the dual mode receiver; and transmitting a second service transmit signal in a second service using the second antenna.
According to another aspect, a computer-readable medium storing a computer program, wherein execution of the computer program is for engaging one or more switching devices to perform the following: a) connecting a first service transmitter to a first antenna; b) disconnecting a dual mode receiver from the first antenna; c) disconnecting a second service transmitter from the first antenna; d) connecting the second service transmitter to a second antenna; e) disconnecting a diversity receiver from the second antenna; transmitting a first service transmit signal in a first service using the first antenna; and transmitting a second service transmit signal in a second service using the second antenna.
According to another aspect, a computer-readable medium storing a computer program, wherein execution of the computer program is for engaging one or more switching devices to perform the following: a) disconnecting a first service transmitter from a first antenna; b) connecting a dual mode receiver to the first antenna; c) disconnecting a second service transmitter from the first antenna; d) disconnecting the second service transmitter from a second antenna; e) connecting a diversity receiver to the second antenna; receiving a first service receive signal in a first service using the first antenna and the dual mode receiver; and receiving a second service receive signal in a second service using the second antenna and the diversity receiver.
A potential advantage of the present disclosure includes the ability to achieve concurrent full throughput of multiple wireless services on a single device, such as an access terminal, a user equipment, a mobile device, etc.
It is understood that other aspects will become readily apparent to those skilled in the art from the following detailed description, wherein it is shown and described various aspects by way of illustration. The drawings and detailed description are to be regarded as illustrative in nature and not as restrictive.
a, 6b and 6c illustrate examples of filter responses.
The detailed description set forth below in connection with the appended drawings is intended as a description of various aspects of the present disclosure and is not intended to represent the only aspects in which the present disclosure may be practiced. Each aspect described in this disclosure is provided merely as an example or illustration of the present disclosure, and should not necessarily be construed as preferred or advantageous over other aspects. The detailed description includes specific details for the purpose of providing a thorough understanding of the present disclosure. However, it will be apparent to those skilled in the art that the present disclosure may be practiced without these specific details. In some instances, well-known structures and devices are shown in block diagram form in order to avoid obscuring the concepts of the present disclosure. Acronyms and other descriptive terminology may be used merely for convenience and clarity and are not intended to limit the scope of the present disclosure.
While for purposes of simplicity of explanation, the methodologies are shown and described as a series of acts, it is to be understood and appreciated that the methodologies are not limited by the order of acts, as some acts may, in accordance with one or more aspects, occur in different orders and/or concurrently with other acts from that shown and described herein. For example, those skilled in the art will understand and appreciate that a methodology could alternatively be represented as a series of interrelated states or events, such as in a state diagram. Moreover, not all illustrated acts may be required to implement a methodology in accordance with one or more aspects.
The techniques described herein may be used for various wireless communication networks such as Code Division Multiple Access (CDMA) networks, Time Division Multiple Access (TDMA) networks, Frequency Division Multiple Access (FDMA) networks, Orthogonal FDMA (OFDMA) networks, Single-Carrier FDMA (SC-FDMA) networks, etc. The terms “networks” and “systems” are often used interchangeably. A CDMA network may implement a radio technology such as Universal Terrestrial Radio Access (UTRA), cdma2000, etc. UTRA includes Wideband-CDMA (W-CDMA) and Low Chip Rate (LCR). Cdma2000 covers IS-2000, IS-95 and IS-856 standards. A TDMA network may implement a radio technology such as Global System for Mobile Communications (GSM). An OFDMA network may implement a radio technology such as Evolved UTRA (E-UTRA), IEEE 802.11, IEEE 802.16, IEEE 802.20, Flash-OFDM®, etc. UTRA, E-UTRA, and GSM are part of Universal Mobile Telecommunication System (UMTS). Long Term Evolution (LTE) is an upcoming release of UMTS that uses E-UTRA. UTRA, E-UTRA, GSM, UMTS and LTE are described in documents from an organization named “3rd Generation Partnership Project” (3GPP). cdma2000 is described in documents from an organization named “3rd Generation Partnership Project 2” (3GPP2). These various radio technologies and standards are known in the art.
The access node/UE system 100 includes an access node 101 (e.g., base station) and a user equipment or UE 201 (e.g., wireless communication device). In the downlink leg, the access node 101 (e.g., base station) includes a transmit (TX) data processor A 110 that accepts, formats, codes, interleaves and modulates (or symbol maps) traffic data and provides modulation symbols (e.g., data symbols). The TX data processor A 110 is in communication with a symbol modulator A 120. The symbol modulator A 120 accepts and processes the data symbols and downlink pilot symbols and provides a stream of symbols. In one aspect, it is the symbol modulator A 120 that modulates (or symbol maps) traffic data and provides modulation symbols (e.g., data symbols). In one aspect, symbol modulator A 120 is in communication with processor A 180 which provides configuration information. Symbol modulator A 120 is in communication with a transmitter unit (TMTR) A 130. The symbol modulator A 120 multiplexes the data symbols and downlink pilot symbols and provides them to the transmitter unit A 130.
Each symbol to be transmitted may be a data symbol, a downlink pilot symbol or a signal value of zero. The downlink pilot symbols may be sent continuously in each symbol period. In one aspect, the downlink pilot symbols are frequency division multiplexed (FDM). In another aspect, the downlink pilot symbols are orthogonal frequency division multiplexed (OFDM). In yet another aspect, the downlink pilot symbols are code division multiplexed (CDM). In one aspect, the transmitter unit A 130 receives and converts the stream of symbols into one or more analog signals and further conditions, for example, amplifies, filters and/or frequency upconverts the analog signals, to generate an analog downlink signal suitable for wireless transmission. The analog downlink signal is then transmitted through antenna 140.
In the downlink leg, the UE 201 includes antenna 210 for receiving the analog downlink signal and inputting the analog downlink signal to a receiver unit (RCVR) B 220. In one aspect, the receiver unit B 220 conditions, for example, filters, amplifies, and frequency downconverts the analog downlink signal to a first “conditioned” signal. The first “conditioned” signal is then sampled. The receiver unit B 220 is in communication with a symbol demodulator B 230. The symbol demodulator B 230 demodulates the first “conditioned” and “sampled” signal (e.g., data symbols) outputted from the receiver unit B 220. One skilled in the art would understand that an alternative is to implement the sampling process in the symbol demodulator B 230. The symbol demodulator B 230 is in communication with a processor B 240. Processor B 240 receives downlink pilot symbols from symbol demodulator B 230 and performs channel estimation on the downlink pilot symbols. In one aspect, the channel estimation is the process of characterizing the current propagation environment. The symbol demodulator B 230 receives a frequency response estimate for the downlink leg from processor B 240. The symbol demodulator B 230 performs data demodulation on the data symbols to obtain data symbol estimates on the downlink path. The data symbol estimates on the downlink path are estimates of the data symbols that were transmitted. The symbol demodulator B 230 is also in communication with a RX data processor B 250.
The RX data processor B 250 receives the data symbol estimates on the downlink path from the symbol demodulator B 230 and, for example, demodulates (i.e., symbol demaps), deinterleaves and/or decodes the data symbol estimates on the downlink path to recover the traffic data. In one aspect, the processing by the symbol demodulator B 230 and the RX data processor B 250 is complementary to the processing by the symbol modulator A 120 and TX data processor A 110, respectively.
In the uplink leg, the UE 201 includes a TX data processor B 260. The TX data processor B 260 accepts and processes traffic data to output data symbols. The TX data processor B 260 is in communication with a symbol modulator D 270. The symbol modulator D 270 accepts and multiplexes the data symbols with uplink pilot symbols, performs modulation and provides a stream of symbols. In one aspect, symbol modulator D 270 is in communication with processor B 240 which provides configuration information. The symbol modulator D 270 is in communication with a transmitter unit B 280.
Each symbol to be transmitted may be a data symbol, an uplink pilot symbol or a signal value of zero. The uplink pilot symbols may be sent continuously in each symbol period. In one aspect, the uplink pilot symbols are frequency division multiplexed (FDM). In another aspect, the uplink pilot symbols are orthogonal frequency division multiplexed (OFDM). In yet another aspect, the uplink pilot symbols are code division multiplexed (CDM). In one aspect, the transmitter unit B 280 receives and converts the stream of symbols into one or more analog signals and further conditions, for example, amplifies, filters and/or frequency upconverts the analog signals, to generate an analog uplink signal suitable for wireless transmission. The analog uplink signal is then transmitted through antenna 210.
The analog uplink signal from UE 201 is received by antenna 140 and processed by a receiver unit A 150 to obtain samples. In one aspect, the receiver unit A 150 conditions, for example, filters, amplifies and frequency downconverts the analog uplink signal to a second “conditioned” signal. The second “conditioned” signal is then sampled. The receiver unit A 150 is in communication with a symbol demodulator C 160. One skilled in the art would understand that an alternative is to implement the sampling process in the symbol demodulator C 160. The symbol demodulator C 160 performs data demodulation on the data symbols to obtain data symbol estimates on the uplink path and then provides the uplink pilot symbols and the data symbol estimates on the uplink path to the RX data processor A 170. The data symbol estimates on the uplink path are estimates of the data symbols that were transmitted. The RX data processor A 170 processes the data symbol estimates on the uplink path to recover the traffic data transmitted by the wireless communication device 201. The symbol demodulator C 160 is also in communication with processor A 180. Processor A 180 performs channel estimation for each active terminal transmitting on the uplink leg. In one aspect, multiple terminals may transmit pilot symbols concurrently on the uplink leg on their respective assigned sets of pilot subbands where the pilot subband sets may be interlaced.
Processor A 180 and processor B 240 direct (i.e., control, coordinate or manage, etc.) operation at the access node 101 (e.g., base station) and at the UE 201, respectively. In one aspect, either or both processor A 180 and processor B 240 are associated with one or more memory units (not shown) for storing of program codes and/or data. In one aspect, either or both processor A 180 or processor B 240 or both perform computations to derive frequency and impulse response estimates for the uplink leg and downlink leg, respectively.
In one aspect, the access node/UE system 100 is a multiple-access system. For a multiple-access system (e.g., frequency division multiple access (FDMA), orthogonal frequency division multiple access (OFDMA), code division multiple access (CDMA), time division multiple access (TDMA), space division multiple access (SDMA), etc.), multiple terminals transmit concurrently on the uplink leg, allowing access to a plurality of UEs. In one aspect, for the multiple-access system, the pilot subbands may be shared among different terminals. Channel estimation techniques are used in cases where the pilot subbands for each terminal span the entire operating band (possibly except for the band edges). Such a pilot subband structure is desirable to obtain frequency diversity for each terminal.
One important characteristic of communications networks is the choice of wired or wireless media for the transmission of electrical signals among the constituents of the network. In the case of wired networks, tangible physical media such as copper wire, coaxial cable, fiber optic cable, etc. are employed to propagate guided electromagnetic waveforms which carry message traffic over a distance. Wired networks are a traditional form of communications networks and are typically favored for interconnection of fixed network elements or for bulk data transfer. For example, fiber optic cables are often the preferred transmission media for very high throughput transport applications over long distances between large network hubs, for example, bulk data transport across or between continents over the Earth's surface.
On the other hand, in many cases, wireless networks are preferred when the network elements are mobile with dynamic connectivity or if the network architecture is formed in an ad hoc, rather than fixed, topology. Wireless networks employ intangible physical media in an unguided propagation mode using electromagnetic waves in the radio, microwave, infrared, optical, etc. frequency bands. Wireless networks have the distinct advantage of facilitating user mobility and rapid field deployment compared to fixed wired networks. However, usage of wireless propagation requires significant active resource management among the network users and high levels of mutual coordination and cooperation for compatible spectrum utilization.
For example, popular wireless network technologies include Bluetooth (BT) and wireless local area networks (WLAN). Bluetooth and WLAN are both wireless communication technologies designed for providing connectivity to devices.
Bluetooth, for example, is used for wireless headsets and connections between phones and laptops. Bluetooth is a widely used wireless communications protocol to implement a wireless personal area network (WPAN) over very short distances, typically for a coverage area of a few meters radius, as an alternative to wired interconnection among local components. In one example, Bluetooth may be used to connect personal computers, personal digital assistants (PDA), mobile phones, wireless headsets, etc.
Alternatively, a WLAN may be used to interconnect nearby devices together, employing widely used networking protocols such as WiFi or, more generally, a member of the IEEE 802.11 wireless protocol family. WLAN, for example, is used for wireless networks in a home or business (a.k.a. WiFi).
One issue with wireless network technologies is that they often share the same frequency band for transmission. Thus, co-channel interference is a problem that must be actively managed. For example, both Bluetooth and WLAN systems may use the same unlicensed Industrial, Scientific, and Medical (ISM) spectral band centered around 2.4 GHz. In one example, mobile devices may share a cost-effective common antenna which accesses both wireless technologies. To support user scenarios with simultaneous BT and WLAN operation, time division multiple access (TDMA) coexistence algorithms are implemented. Thus, a coexistence algorithm is needed to arbitrate usage between Bluetooth and WLAN access technologies for co-located wireless devices.
However, performance improvement can be achieved by running the systems concurrently using separate antennas for BT and WLAN and designing the BT and WLAN RF circuits to accommodate the presence of a strong interfering technology within the same device. Additionally, changes in BT and WLAN power control responsive to the transmit and receive power levels of each technology can be implemented to improve the range of conditions over which dual antenna concurrency is possible. Also, a high level algorithm can be implemented to switch between dual antenna concurrency and traditional TDMA techniques responsive to the signal conditions and performance.
In another aspect, alternate antenna implementations may be used. For example, the mobile device may implement dynamic switching between a wide area network (WAN) antenna and a dual antenna for BT and WLAN. In one example, a second antenna is implemented as a printed circuit on an electronics package. Alternately, a single antenna with programmable diplexers or special combiner is used to obtain the performance benefits of a dual antenna with the lower cost of a single physical antenna. In one example, the diplexer is implemented with microelectromechanical system (MEMS) technology to provide sufficient RF isolation.
Example antenna types that may be employed in the present disclosure are dipole, helix, patch, microstrip, whip, monopole, etc. One skilled in the art would understand that these example antenna types are not restrictive and other antenna types may be used without affecting the scope or spirit of the present disclosure.
In one aspect, there are several approaches towards coexistence between a wireless personal area network (WPAN) such as Bluetooth (BT) and a wireless local area network (WLAN). In one example, time division multiplexing (TDM) may be used as a medium access control (MAC) level technique to allow only one wireless system to operate at a given time, for example, using packet traffic arbitration (PTA) or 802.11 protocol features to control access point (AP) timing. In this case, the maximum possible throughput is dictated by the percentage of time a system has the channel.
In another example, transmission concurrency with RF isolation may be used for coexistence. For example, transmission concurrency may include both frequency separation (e.g., BT automatic frequency hopping) and interference reduction between the transmitter of one technology and the receiver of the other technology. Transmission concurrency may be obtained, for example, through a single antenna with a programmable diplexer using microelectromechanical systems (MEMS) technology or a dual antenna with good RF isolation between the two antenna ports. In this case, full standalone throughput may be achieved when the RF isolation is sufficient for the given signal conditions.
In another example, transmission concurrency may be obtained, for example, by combining both TDM with antenna RF isolation. For example, TDM may be used when automatic frequency hopping (AFH) is not possible or when the AFH frequencies overlap with the WLAN frequencies. Alternatively, TDM may be used when the transmit power of one technology is strong and the receive power of the other technology is weak such that the isolation is insufficient. In another example, RF isolation may be used the remainder of the time. In this case, performance of any RF isolation scheme is quantified by the range of practical conditions where the 2 systems can operate at full concurrency.
In one aspect, a shared low noise amplifier (LNA) design is beneficial thorough improved standalone performance and increasing receiver sensitivity by removing a switch insertion loss. For example, a shared LNA design for BT/WLAN coexistence may have a sensitivity improvement on the order of 0.5 to 1.5 dB.
In another example, in conjunction with a single antenna shared LNA approach, a two antenna solution without additional RF filtering could be used for BT-WLAN coexistence. In one example, a primary antenna and LNA could be used solely for BT mode and a separate, diversity antenna and LNA could be used by WLAN mode. In one example, an extra switch may be needed to route WLAN transmit signals to the diversity antenna.
Table 1 below illustrates an example performance summary for a BT-WLAN coexistence solution. As can be seen, in general, full concurrency operation is more probable as the transmission ranges for both BT and WLAN modes become smaller. Conversely, concurrent operation is less likely and TDM techniques are favored as the transmission ranges for both BT and WLAN become larger. In one example, full concurrency operation is enabled with transmit power control for BT, WLAN or both modes. In another example, dynamic switching is provided between concurrency operation and TDM operation depending on the relative transmission ranges.
In one example, during concurrent operation with separate antennas, the WLAN mode may use the diversity antenna and the BT mode may use the primary antenna. In addition, the WLAN receiver may use the diversity LNA and the WLAN transmitter may be routed to the diversity antenna. In one aspect, the WLAN diversity path receive path filter will increase from a third order to a fifth order at the cost of more required real estate, for example, an extra 0.2 mm2. In another aspect, automatic gain control (AGC) algorithms will change without hardware impact.
In one aspect, a MEMS-based diplexer could diplex the WLAN operational frequency from the rest of the ISM band which the BT system could use.
In one example, a MEMS-based diplexer is programmable. This programmability implies that the diplexer may be totally reconfigurable should the WLAN operational band change. In the case of BT or WLAN operation, where one or the other mode is operational, in one example, the MEMS-based diplexer in the unused path may be programmed to a high impedance state. In one aspect, high impedance state is attained in one of two ways: (1) for the case of WLAN operational mode only, the MEMS-based diplexer in the BT path may remain unchanged as this path would already be in a high impedance state. However, it may be possible to make this high impedance state have an even higher impedance since in this case there is no requirement for a low insertion loss for the BT mode (i.e., the BT mode is non-operational). In the case of BT operational mode only, the reverse may be true. (2) The MEMS-based diplexer notch may be programmed to be much wider in frequency extent and much deeper in insertion loss so that it has higher impedance and is a better open circuit. In one example, the basis behind the programming of the MEMS-based diplexer in single mode operation is to make the diplexer operate more like a switch. In addition, having the MEMS-based diplexer operate more like a switch in a single mode operation implies that time-shared operations is also possible. In particular, packet traffic arbitration (PTA)-based control is also possible. In another example, a bandpass filter (BPF) may be included with the diplexer design.
In one example, the first service is a wireless personal area network (WPAN). And, in one example, the first service is a Bluetooth (BT). In one example, the second service is a wireless local area network (WLAN). In one example, the first and second switch may be the same switch. In one example, the first and second switches are programmable. In one example, the steps of the flow diagrams of
In one example, the first service is a wireless personal area network (WPAN). And, in one example, the first service is a Bluetooth (BT). In one example, the second service is a wireless local area network (WLAN). In one example, the steps of the flow diagrams of
One skilled in the art would understand that although the examples in
One skilled in the art would understand that the steps disclosed in the example flow diagrams in
Those of skill would further appreciate that the various illustrative components, logical blocks, modules, circuits, and/or algorithm steps described in connection with the examples disclosed herein may be implemented as electronic hardware, firmware, computer software, or combinations thereof. To clearly illustrate this interchangeability of hardware, firmware and software, various illustrative components, blocks, modules, circuits, and/or algorithm steps have been described above generally in terms of their functionality. Whether such functionality is implemented as hardware, firmware or software depends upon the particular application and design constraints imposed on the overall system. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope or spirit of the present disclosure.
For example, for a hardware implementation, the processing units may be implemented within one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), processors, controllers, micro-controllers, microprocessors, other electronic units designed to perform the functions described therein, or a combination thereof. With software, the implementation may be through modules (e.g., procedures, functions, etc.) that perform the functions described therein. The software codes may be stored in memory units and executed by a processor unit. Additionally, the various illustrative flow diagrams, logical blocks, modules and/or algorithm steps described herein may also be coded as computer-readable instructions carried on any computer-readable medium known in the art or implemented in any computer program product known in the art.
In one or more examples, the steps or functions described herein may be implemented in hardware, software, firmware, or any combination thereof. If implemented in software, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Computer-readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A storage media may be any available media that can be accessed by a computer. By way of example, and not limitation, such computer-readable media can comprise RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer. Also, any connection is properly termed a computer-readable medium. For example, if the software is transmitted from a website, server, or other remote source using a coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technologies such as infrared, radio, and microwave, then the coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included in the definition of medium. Disk and disc, as used herein, includes compact disc (CD), laser disc, optical disc, digital versatile disc (DVD), floppy disk and blu-ray disc where disks usually reproduce data magnetically, while discs reproduce data optically with lasers. Combinations of the above should also be included within the scope of computer-readable media.
In one example, the illustrative components, flow diagrams, logical blocks, modules and/or algorithm steps described herein are implemented or performed with one or more processors. In one aspect, a processor is coupled with a memory which stores data, metadata, program instructions, etc. to be executed by the processor for implementing or performing the various flow diagrams, logical blocks and/or modules described herein.
The previous description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present disclosure. Various modifications to these aspects will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other aspects without departing from the spirit or scope of the disclosure.
The present application for patent claims priority to Provisional Application No. 61/226,747, entitled Method and Apparatus for Dual Antenna WPAN/WLAN Coexistence, filed Jul. 20, 2009, and Provisional Application No. 61/187,573 entitled: Method and Apparatus for Dynamic and Dual Antenna Bluetooth (BT)/WLAN Coexistence, filed Jun. 16, 2009, and assigned to the assignee hereof and hereby expressly incorporated by reference herein.
| Number | Date | Country | |
|---|---|---|---|
| 61226747 | Jul 2009 | US | |
| 61187573 | Jun 2009 | US |
