GB2492324A - Using cognitive radio for relaying in a wireless communication network - Google Patents
Using cognitive radio for relaying in a wireless communication network Download PDFInfo
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- GB2492324A GB2492324A GB1110630.9A GB201110630A GB2492324A GB 2492324 A GB2492324 A GB 2492324A GB 201110630 A GB201110630 A GB 201110630A GB 2492324 A GB2492324 A GB 2492324A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W40/00—Communication routing or communication path finding
- H04W40/02—Communication route or path selection, e.g. power-based or shortest path routing
- H04W40/12—Communication route or path selection, e.g. power-based or shortest path routing based on transmission quality or channel quality
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/155—Ground-based stations
- H04B7/15528—Control of operation parameters of a relay station to exploit the physical medium
- H04B7/15542—Selecting at relay station its transmit and receive resources
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/0006—Assessment of spectral gaps suitable for allocating digitally modulated signals, e.g. for carrier allocation in cognitive radio
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
- H04W72/541—Allocation or scheduling criteria for wireless resources based on quality criteria using the level of interference
Abstract
A wireless communications system comprising at least one primary communication node P1 operable to relay a signal from a source node S to a destination node D via a primary communication path LSP1, LDP1 over a portion of a physical communication medium, and at least one secondary communication node S1 operable to detect an unused sub-portion of said portion of said physical communication medium, and further operable to relay said signal and/or a further signal between said source node and said destination node via a secondary communication path LSS1, LDS1 over said unused sub-portion of said portion of said physical communication medium. The arrangement uses cognitive radio techniques to utilize unused bandwidth (or â spectrum holesâ ) to either provide diversity (re-transmission of the same information) via a relay route or to provide further complementary information to that transmitted on the primary path via a relay route (secondary path) (i.e. to â enhanceâ the communication via the primary path). The further information could comprise control information, parity or error correction information, channel state information or feedback information and the like. The primary communication node is a licensed node and the secondary communication node is an opportunistic unlicensed node utilising detected unused bandwidth. At least one of the secondary communication nodes may be operable to monitor a channel condition of the primary communication path to determine whether the primary communication paths satisfies a predetermined channel condition and if it fails to do so the secondary node may be further operable to obtain channel information relating to the primary communication path to control the relaying.
Description
WIRELESS COMMUNICATIONS METHODS AND APPARATUS
Field
Embodiments described herein relate generally to facilitating wireless communications using cognitive radio in a wireless communications network.
Background
Cognitive Radio (CR) is a technique that provides the capability to use or share a spectrum between licensed (primary) and unlicensed (secondary) users (or devices) in an opportunistic manner. One way of sharing the spectrum between the primary users and the secondary users is by allowing the secondary users to access some or all of the frequency bands that were originally allocated to the primary users when those frequency bands are not used by the primary users. More generally, the secondary users can exploit spectrum holes" in a temporal, frequency, or spatial domain of the primary users, provided it does not interfere with the primary transmission.
Cooperative relaying has been widely implemented in wireless relay networks to extend communication coverage, increase channel capacity, and improve link reliability. There are two types of relaying strategies: (1) decode-and-forward (DF) relay, whereby a received signal is decoded, re-encoded, and forwarded by a relay station, and (2) amplify-and-forward (AF) relay, whereby a received signal is simply amplified and forwarded to another wireless device or another relay station in the network. In relaying networks, a source node is assisted by one or multiple intermediate nodes, referred to as the relay nodes, to deliver information to the destination node through one or multiple hops.
Description of the drawings
Embodiments will now be described with reference to the accompanying drawings, in which: Figure 1 illustrates a wireless communications network arrangement having primary nodes and secondary nodes; Figure 2 illustrates a wireless communications device incorporating a specific embodiment of the invention; Figure 3 illustrates a flow diagram of a method of establishing a secondary relay link in a wireless communications network according to an embodiment; Figure 4 illustrates an example of the method of Figure 3 in a wireless communications network according to an embodiment; Figure 5 illustrates an example of the method of Figure 3 in a wireless communications network according to an embodiment; Figure 6 illustrates an example of the method of Figure 3 in a wireless communications network according to an embodiment; Figure 7 illustrates an example of the method of Figure 3 in a wireless communications network according to an embodiment, and Figure 8 illustrates an example of the method of Figure 3 in a wireless communications network according to an embodiment.
Detailed description
Specific embodiments will be described in further detail in the following paragraphs on the basis of the attached figures. It will be appreciated that this is by way of example only, and should not be viewed as presenting any limitation on the scope of protection sought.
According to one embodiment there is provided a wireless communications system comprising at least one primary communication node operable to relay a signal from a source node to a destination node via a primary communication path over a portion of a physical communication medium, and at least one secondary communication node operable to detect an unused sub-portion of said portion of said physical communication medium, and further operable to relay said signal andfor a further signal between said source node and said destination node via a secondary communication path over said unused sub-portion of said portion of said physical communication medium.
Said at least one secondary communication node may be operable to monitor a channel condition of said primary communication path to determine whether said primary communication path satisfy a predetermined channel condition.
The term "channel" as used herein preferably connotes a transmission medium through which said signal is transmitted from one node to another node. Thus the channel condition may include, but not limited to, channel statistics, Quality of Service, and reliability parameters, such as latency and data rate.
Said at least one secondary node may be further operable to obtain channel information relating to said primary communication path in an event that said primary communication path fails to satisfy said predetermined channel condition.
Said at least one primary communication node may be operable to monitor a channel condition of said primary communication path to determine whether said primary communication path satisfy a predetermined channel condition.
Said at least one primary communication node may be further operable to transmit an event trigger message to said at least one secondary node in an event that said primary communication path fails to satisfy said predetermined channel condition.
Said at least one secondary node may be further operable to obtain channel information relating to said primary communication path, upon reception of said event trigger message.
Said at least one secondary node may be operable to relay said signal and/or a further signal between said source node and said destination node via a secondary communication path over said unused sub-portion based on said channel information.
In one embodiment, said at least one secondary node may be further operable to transmit said signal from said source node to said destination node via said secondary communication path, thereby providing diversity of said signal.
In another embodiment, said at least one secondary node may be further operable to transmit a feedback signal from said destination node to said source node via said secondary communication path.
In yet another embodiment, said at least one secondary node may be further operable to transmit said further signal from said source node to said destination node via said secondary communication path in order to enhance transmission of said signal via primary communication path.
The further signal may include control information, parity information, and channel state information relating to said signal.
The physical communications medium may be defined in time and/or frequency and/or space.
In another embodiment there is provided a relay device for relaying a signal in a wireless communications network comprising a plurality of wireless devices, wherein at least one of said plurality of wireless devices is operable to relay a signal from one of said plurality of wireless devices to another one of said plurality of wireless devices via a communication path over a portion of a physical communication medium, the relay device comprises a detector for detecting an unused sub-portion of said portion of said physical communication medium, and a transceiver for relaying said signal and/or a further signal between said one of said plurality of wireless devices and said another one of said plurality of wireless devices via a further communication path over said unused sub-portion of said portion of said physical communication medium.
The relay device may further comprise means for monitoring a channel condition of said primary communication path to determine whether said primary communication path satisfy a predetermined channel condition.
The relay device may further comprise means for obtaining channel information relating to said primary communication path, in an event that said primary communication path fails to satisfy said predetermined channel condition.
The transceiver may be operable to relay said signal and/or a further signal between said one of said plurality of wireless devices to said another one of said plurality of wireless devices via a secondary communication path over said unused sub-portion of said portion of said physical communication medium based on said channel information.
In one embodiment, the transceiver may be further operable to transmit said signal from said one of said plurality of wireless devices to said another one of said plurality of wireless devices via said secondary communication path, thereby providing diversity of said signal.
In another embodiment, the transceiver may be further operable to transmit a feedback signal from said another one of said plurality of wireless devices to said one of said plurality of wireless devices via said secondary communication path.
In yet another embodiment, the transceiver may be further operable to transmit said further signal from said one of said plurality of wireless devices to said another one of said plurality of wireless devices via said secondary communication path in order to enhance transmission of said signal via primary communication path.
The further signal may include control information, parity information, and channel state information relating to said signal.
The physical communications medium may be defined in time and/or frequency and/or space.
In yet another embodiment there is provided a method of relaying a signal in a wireless communications network comprising a plurality of wireless devices, wherein at least one of said plurality of wireless devices is operable to relay a signal from one of said plurality of wireless devices to another one of said plurality of wireless devices via a communication path over a portion of a physical communication medium, the method being performed by a further one of said wireless devices, the method comprising an unused sub-portion of said portion of said physical communication medium, and relaying said signal and/or a further signal between said one of said plurality of wireless devices and said another one of said plurality of wireless devices via a further communication path over said unused sub-portion of said portion of said physical communication medium.
In one embodiment, the method may further comprise monitoring a channel condition of said primary communication path to determine whether said primary communication path satisfy a predetermined channel condition.
In another embodiment, the method may further comprise obtaining channel information relating to said primary communication path, in an event that said primary communication path fails to satisfy said predetermined channel condition.
The step of relaying may include relaying said signal and/or a further signal between said one of said plurality of wireless devices to said another one of said plurality of wireless devices via a secondary communication path over said unused sub-portion based on said channel information.
In one embodiment, the step of relaying may include transmitting said signal from said one of said plurality of wireless devices to said another one of said plurality of wireless devices via said secondary communication path, thereby providing diversity of said signal.
In another embodiment, the step of relaying may include transmitting a feedback signal from said another one of said plurality of wireless devices to said one of said plurality of wireless devices via said secondary communication path.
In yet another embodiment, the step of relaying may further include transmitting said further signal from said one of said plurality of wireless devices to said another one of said plurality of wireless devices via said secondary communication path in order to enhance transmission of said signal via primary communication path.
The further signal may include control information, parity information, and channel state information relating to said signal.
The physical communications medium may be defined in time and/or frequency and/or space.
One embodiment provides a computer program product comprising computer executable instructions which, when executed by a computer, cause the computer to perform a method as set out above. The computer program product may be embodied in a carrier medium, which may be a storage medium or a signal medium, A storage medium may include optical storage means, or magnetic storage means, or electronic storage means.
The described embodiments can be incorporated into a specific hardware device, a general purpose device configure by suitable software, or a combination of both.
Aspects can be embodied in a software product, either as a complete software implementation, or as an add-on component for modification or enhancement of existing software (such as a plug in). Such a software product could be embodied in a carrier medium, such as a storage medium (e.g. an optical disk or a mass storage memory such as a FLASH memory) or a signal medium (such as a download).
Specific hardware devices suitable for the embodiment could include an application specific device such as an ASIC, an FPGA or a DSP, or other dedicated functional hardware means. The reader will understand that none of the foregoing discussion of embodiment in software or hardware limits future implementation of the invention on yet to be discovered or defined means of execution.
A wireless communications network comprising primary users (primary devices or primary nodes), P1 and P2, and secondary users (secondary devices or secondary nodes), Si and S2, according to an embodiment is illustrated in Figure 1. The terms "primary user(s)", "primary device(s)", and "primary node(s)" are used interchangeably herein to describe a communication device that is licensed to use the spectral resources in the communications network. In contrast, the terms "secondary user(s)", "secondary device(s)", and "secondary node(s)" are used interchangeably herein to refer to an "unlicensed" communication device that seeks opportunities for transmission by exploiting the "spectrum holes" in the temporal, frequency, or spatial domain of the primary devices.
For the sake of simplicity, two primary nodes and two secondary nodes are illustrated in Figure 1. However, it will be appreciated that the wireless communications network may comprise any number of users (primary and secondary) which the wireless
B
communications network can support. In a more simplified arrangement, the wireless communications network may comprise one primary node and one secondary node.
In Figure 1, each illustrated circle represents a node in the network. As shown in Figure 1 a signal is transmitted directly from the source node, 8, to the destination node, D, via a communication link, LSD. Alternatively, or if required, the signal can also be transmitted through either a primary relay node, P1 via relay links L51 and LDP1, or a relay node, P2, via relay links Lsp2 and LDp2.
In a "multi-hop" relay arrangement, the signal can also be transmitted through the relay nodes, P1 and P2 via relays links, L12, and LDP1. The relay links, L81, L1p2, and L0P1, form a communication path for delivering the signal from the source node, S, to the destination node, D. The primary nodes (Le. S, D, P1, and P2) in Figure 1 communicate and deliver a service according to predetermined QoS (Quality of Service) and/or reliability contract parameters, such as latency, data rate, percentage of packets delivered successfully and so on.
According to an embodiment, the secondary nodes in the network is configured to operate opportunistically as a relay node to assist the primary transmission between the source node, 5, and the destination node, D, in an event that the primary transmission fails to satisfy the predetermined QoS and/or reliability contract parameters. For example, one of the contract parameters falls below a predetermined threshold value.
Figure 2 illustrates schematically hardware operably configured (by means of software or application specific hardware components) as a wireless communications device 100. In the examples provided herein, the wireless communications device includes the source node, destination node, and the relay nodes (primary and secondary).
The wireless communications device 100 illustrated in Figure 2 is generally capable of being used to establish a communications channel with one or more other devices and, in accordance with a specific embodiment. The reader will appreciate that the actual implementation of the device is non-specific, in that it could be any communication device such as a base station or a user terminal.
The device 100 comprises a processor 120 operable to execute machine code instructions stored in a working memory 124 and/or retrievable from a mass storage device 122. By means of a general purpose bus 130, user operable input devices 136 are capable of communication with the processor 120. The user operable input devices 136 comprise, in this example, a keyboard and a mouse though it will be appreciated that any other input devices could also or alternatively be provided, such as another type of pointing device, a writing tablet, speech recognition means, or any other means by which a user input action can be interpreted and converted into data signals.
Audio/video output hardware devices 138 are further connected to the general purpose bus 130, for the output of information to a user. Audio/video output hardware devices 138 can include a visual display unit, a speaker or any other device capable of presenting information to a user.
Communications hardware devices 132, connected to the general purpose bus 130, are connected to antennas 134. In the illustrated embodiment in Figure 2, the working memory 124 stores user applications 126 which, when executed by the processor 120, cause the establishment of a user interface to enable communication of data to and from a user. The applications in this embodiment establish general purpose or specific computer implemented utilities that might habitually be used by a user.
Communications facilities 128 in accordance with the specific embodiment are also stored in the working memory 124, for establishing a communications protocol to enable data generated in the execution of one of the applications 126 to be processed and then passed to the communications hardware devices 132 for transmission and communication with another communications device. It will be understood that the software defining the applications 126 and the communications facilities 128 may be partly stored in the working memory 124 and the mass storage device 122, for convenience. A memory manager could optionally be provided to enable this to be managed effectively, to take account of the possible different speeds of access to data stored in the working memory 124 and the mass storage device 122.
On execution by the processor 120 of processor executable instructions corresponding with the communications facilities 128, the processor 120 is operable to establish communication with another device in accordance with a recognised communications protocol.
While the communications facilities 128 are illustrated as a distinct software element, the reader will appreciate that software can be introduced to a computer in a number of different ways. For instance, a computer program product, consisting of a storage medium could be introduced to a computer, so that stored instructions can then be transferred to the computer. Equally, a signal could be sent to the computer bearing such instructions. Furthermore, in introducing a computer program product, the reader will appreciate that a piece of software may be composed of a number of components, some of which may be new, and others of which may be assumed to be provided in the computer already. For instance, a computer might be reasonably assumed to be supplied with an operating system of known type, and a computer program may be developed on the basis of the presence of such an operating system. The interaction between the computer program developed in that way, and facilities of the operating system, would lead to the definition of a communications facilities element such as illustrated in Figure 2. Thus, any computer program product may be developed as a new, stand-alone product, or as a plug-in to existing products.
Figure 3 illustrates the steps of relaying a signal using a secondary node in the wireless communications network according to an embodiment. The method commences in step S3-1 when one of the contract parameters falls below a predetermined threshold value, and it has been detected by any one of the primary nodes and/or secondary nodes. It will be appreciated that the primary nodes andlor the secondary nodes are configured to monitor the quality of communication path between the source node and the destination node and to detect an event that the primary transmission fails to satisfy the predetermined Q0S andfor reliability contract parameters. For convenience, such an event is herein referred to as an "outage".
In an event that an outage is detected by the primary nodes, one of the primary nodes will inform the secondary nodes about the outage (steps S3-2 and 33-3). It is appreciated this information can be broadcast to the secondary nodes through beacon messages or probe response messages.
Upon receiving the information about the outage of the primary transmission, the secondary node obtains channel information relating to the primary transmission (step S3-4). It is noted that this step can also be performed without performing step 53-3, if the transmission failure is detected directly by the secondary node.
In step S3-5, the secondary node determines a suitable cognitive response to enhance the reliability of the primary transmission.
For example, if it is determined that the outage of the primary transmission is "bursty" in nature (i.e. a sudden temporal loss of data with received radio energy being maintained at an acceptable level), one of the cognitive responses could be to engage a secondary path to carry full information of the primary transmission. The re-transmission of the primary transmission via the secondary node(s) provides diversity. In this case, and referring to Figure 4, a signal is primarily transmitted from the source node, S, to the destination node, 0, through primary relay node P1 via primary transmission links L51 and L0p1. Therefore, one of the cognitive responses would be to transmit full information of the primary transmission through the any one following secondary relay node(s): (1) secondary node Si, via L551 and L01; (2) secondary node S2, via Ls52 and L032; or (3) secondary nodes, Si and 52, via L552, L5152, and Ls1.
In another example, the outage relates to an increase in overall interference and/or path loss (i.e., an ongoing reduction in SINR and SNR levels). In this case, a suitable cognitive response would be to engage the secondary nodes to carry "side' information to enhance the transmission resilience of the primary transmission, The side information may include, but not limited to, control information, additional parity information, and channel state information. One advantage of transmitting side information, as opposed to the transmission of full information, is that it avoids energy wastage in transmitting full information on more than one transmission path. In another embodiment, the "side" information can also be transmitted from the destination node to the source node via a secondary relay node to provide feedback information.
In yet another example, the outage relates to an error rate or bandwidth of the primary transmission path being degraded such that the primary transmission can no longer be delivered. In this case, the roles of the primary node(s) and the secondary node(s) can be reversed by configuring the secondary node(s) to deliver the primary signal and, if possible, the primary node(s) to deliver side information to support the transmission of the primary signal via the secondary node(s).
In step S3-6, based on the cognitive response determined in step S3-5, the secondary node seeks for opportunities for transmission using the unused resources of the primary transmission. In one embodiment, the order of steps S3-5 and 33-6 can be reversed, i.e. step S3-6 can performed before step S3-5. In another embodiment, steps 3-5 and 33-6 can be performed simultaneously.
The cognitive relay transmission is carried out in step S3-7, and, if required, steps 33-1 to 33-7 are repeated.
It is noted that when a cognitive response is determined, any detrimental effects (such as the secondary transmission causing interference to the primary transmission) of implementing the secondary transmission are considered. However, it is further noted that this can be overcome by implementing a primary system and a secondary system that are orthogonal to each other, i.e. the transmissions of signals in the primary system and the secondary system are orthogonal to each other such that interference can be minimised. The orthogonality can be achieved by, for example, utilising spectrum holes of the primary transmission for the secondary transmission.
In one embodiment, the secondary node is configured to provide a feedback link between the destination node and source node by relaying feedback signals from the destination node to the source node.
In another embodiment, the secondary node is configured to enhance the transmission quality of the primary transmission with an outage of the primary transmission being detected. In this case, the secondary node would simply seek for opportunities to transmit, full or side, information using unused resources of the primary transmission.
Figures 5 to 8 illustrate different scenarios of relaying a signal in a wireless communications network comprising primary and secondary nodes.
In Figure 5, a signal is transmitted directly from the source node, 5, to the destination node, Ii The secondary nodes, Si and 52, operate as cognitive relays to opportunistically relay full and/or side information from the source node, S, to the destination node, D. In Figure 6, a signal is transmitted directly from the source node, 5, to the destination node, D, and the signal is also relayed by primary nodes, P1 and P2. The secondary nodes, Si and 32, operate as cognitive relays to opportunistically relay full and/or side information from the source node, 5, to the destination node, D. In Figure 7, a signal is transmitted directly from the source node, S, to the destination node, D. The secondary node, Si, operate as a cognitive relay to opportunistically relay full and/or side information from the source node, 5, to the destination node, D. The secondary node, 52, operate as a cognitive relay to opportunistically relay full feedback information andlor side information from the destination node, D, to the source node, S. In Figure 8, a signal is transmitted directly from the source node, S, to the destination node, D, and the signal is also relayed by primary nodes, P1 and P2. The secondary node, Si, operate as a cognitive relay to opportunistically relay full and/or side information from the source node, 5, to the destination node, D. The secondary node, 52, operate as a cognitive relay to opportunistically relay full feedback information and/or side information from the destination node, D, to the source node, S. A number of methods can be used to notify the destination node that a secondary system is in use. One example is to send control information over the primary tiansmission to notify the destination node that a secondary system is to be applied to enhance the primary transmission.
The above described embodiments can be applied to a delay tolerant network in which data packets can be stored by the secondary nodes and forwarded if and when the destination node comes into range. Furthermore, the described embodiments can also be configured to provide secondary relay network by configuring the secondary nodes to transmit information under that secondary system when the secondary nodes are not used by the primary system to relay information.
While certain embodiments have been described, these embodiments have been presented by way of example only, and are not intended to limit the scope of the inventions. Indeed, the novel systems and devices described herein may be embodied in a variety of other forms; furthermore, various omissions, substitutions and changes in the form of the systems and devices described herein may be made without departing from the spirit of the inventions. The accompanying claims and their equivalents are intended to cover such forms or modifications as would fall within the scope and spirit of the inventions.
Claims (1)
- <claim-text>CLAIMS: 1. A wireless communications system comprising: at least one primary communication node operable to relay a signal from a source node to a destination node via a primary communication path over a portion of a physical communication medium, and at Feast one secondary communication node operable to detect an unused sub-portion of said portion of said physical communication medium, and further operable to relay said signal andlor a further signal between said source node and said destination node via a secondary communication path over said unused sub-portion of said portion of said physical communication medium.</claim-text> <claim-text>2. A wireless communications system according to claim 1, wherein said at least one secondary communication node is operable to monitor a channel condition of said primary communication path to determine whether said primary communication path satisfy a predetermined channel condition.</claim-text> <claim-text>3. A wireless communications system according to claim 2, wherein said at least one secondary node is further operable to obtain channel information relating to said primary communication path in an event that said primary communication path fails to satisfy a predetermined channel condition.</claim-text> <claim-text>4 A wireless communications system according to claim 3, wherein said at least one secondary node is operable to relay said signal and/or a further signal between said source node and said destination node via a secondary communication path over said unused sub-portion based on said channel information.</claim-text> <claim-text>5. A wireless communications system according to claim 4, wherein said at least one secondary node is further operable to transmit said signal from said source node to said destination node via said secondary communication path, thereby providing diversity of said signal.</claim-text> <claim-text>A wireless communications system according to claim 4, wherein said at least one secondary node is further operable to transmit a feedback signal from said destination node to said source node via said secondary communication path.</claim-text> <claim-text>7. A wireless communications system according to claim 4, wherein said at least one secondary node is further operable to transmit said further signal from said source node to said destination node via said secondary communication path in order to enhance transmission of said signal via primary communication path.</claim-text> <claim-text>8. A relay device for relaying a signal in a wireless communications network comprising a plurality of wireless devices, wherein at least one of said plurality of wireless devices is operable to relay a signal from one of said plurality of wireless devices to another one of said plurality of wireless devices via a communication path over a portion of a physical communication medium, the relay device comprises: a detector for detecting an unused sub-portion of said portion of said physical communication medium; and a transceiver for relaying said signal and/or a further signal between said one of said plurality of wireless devices and said another one of said plurality of wireless devices via a further communication path over said unused sub-portion of said portion of said physicar communication medium.</claim-text> <claim-text>9. A relay device according to claim 8, further comprising means for monitoring a channel condition of said primary communication path to determine whether said primary communication path satisfy a predetermined channel condition.</claim-text> <claim-text>10. A relay device according to claim 9, further comprising means for obtaining channel information relating to said primary communication path, in an event that said primary communication path fails to satisfy said predetermined channel condition.</claim-text> <claim-text>11. A relay device according to claim 10, wherein said transceiver is operable to relay said signal and/or a further signal between said one of said plurality of wireless devices to said another one of said plurality of wireless devices via a secondary communication path over said unused sub-portion based on said channel information.</claim-text> <claim-text>12. A relay device according to claim 11, wherein said transceiver is further operable to transmit said signal from said one of said plurality of wireless devices to said another one of said plurality of wireless devices via said secondary communication path, thereby providing diversity of said signal.</claim-text> <claim-text>13. A relay device according to claim 11, wherein said transceiver is further operable to transmit a feedback signal from said another one of said plurality of wireless devices to said one of said plurality of wireless devices via said secondary communication path.</claim-text> <claim-text>14. A relay device according to claim 11, wherein said transceiver is further operable to transmit said further signal from said one of said plurality of wireless devices to said another one of said plurality of wireless devices via said secondary communication path in order to enhance transmission of said signal via primary communication path.</claim-text> <claim-text>15. A method of relaying a signal in a wireless communications network comprising a plurality of wireless devices, wherein at least one of said plurality of wireless devices is operable to relay a signal from one of said plurality of wireless devices to another one of said plurality of wireless devices via a communication path over a portion of a physical communication medium, the method being performed by a further one of said wireiess devices, the method comprising: an unused sub-portion of said portion of said physical communication medium; and relaying said signal andlor a further signal between said one of said plurality of wireless devices and said another one of said plurality of wireless devices via a further communication path over said unused sub-portion of said portion of said physical communication medium.</claim-text> <claim-text>16. A method according to claim 15, further comprising monitoring a channel condition of said primary communication path to determine whether said primary communication path satisfy a predetermined channel condition.</claim-text> <claim-text>17. A method according to claim 16, further comprising obtaining channel information relating to said primary communication path, in an event that said primary communication path fails to satisfy said predetermined channel condition.</claim-text> <claim-text>18. A method according to claim 17, wherein the step of relaying includes relaying said signal and/or a further signal between said one of said plurality of wireless devices to said another one of said plurality of wireless devices via a secondary communication path over said unused sub-portion based on said channel information.</claim-text> <claim-text>19. A method according to claim 18, wherein the step of relaying includes transmitting said signal from said one of said plurality of wireless devices to said another one of said plurality of wireless devices via said secondary communication path, thereby providing diversity of said signal.</claim-text> <claim-text>20. A method according to claim 18, wherein the step of relaying includes transmitting a feedback signal from said another one of said plurality of wireless devices to said one of said plurality of wireless devices via said secondary communication path.</claim-text>
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1110630.9A GB2492324A (en) | 2011-06-22 | 2011-06-22 | Using cognitive radio for relaying in a wireless communication network |
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| Application Number | Priority Date | Filing Date | Title |
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| GB1110630.9A GB2492324A (en) | 2011-06-22 | 2011-06-22 | Using cognitive radio for relaying in a wireless communication network |
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| GB201110630D0 GB201110630D0 (en) | 2011-08-03 |
| GB2492324A true GB2492324A (en) | 2013-01-02 |
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| GB1110630.9A Withdrawn GB2492324A (en) | 2011-06-22 | 2011-06-22 | Using cognitive radio for relaying in a wireless communication network |
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| CN110677176A (en) * | 2018-07-02 | 2020-01-10 | 浙江工商大学 | Combined compromise optimization method based on energy efficiency and spectrum efficiency |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2457635A (en) * | 2006-12-11 | 2009-08-26 | New Jersey Tech Inst | Method and system for stable throughput of cognitive radio with relaying capabilities |
| WO2010005838A2 (en) * | 2008-07-11 | 2010-01-14 | Qualcomm Incorporated | Peer-to-peer device identification and cognitive communication |
| US20100103924A1 (en) * | 2008-10-27 | 2010-04-29 | Motorola, Inc. | Method and system for wireless multi-hopping communication |
| WO2010083901A1 (en) * | 2009-01-22 | 2010-07-29 | Infineon Technologies Ag | Optimizing network wireless communication resources by means of relay stations |
| WO2010120149A2 (en) * | 2009-04-16 | 2010-10-21 | Lg Electronics Inc. | Method for processing traffic in unused band in an intermediate access point |
| EP2248370A2 (en) * | 2008-02-14 | 2010-11-10 | Hong Kong Technologies Group Limited | Robust cooperative spectrum sensing for cognitive radios |
| EP2373096A2 (en) * | 2008-12-24 | 2011-10-05 | LG Electronics Inc. | Method for selecting a relay station |
-
2011
- 2011-06-22 GB GB1110630.9A patent/GB2492324A/en not_active Withdrawn
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2457635A (en) * | 2006-12-11 | 2009-08-26 | New Jersey Tech Inst | Method and system for stable throughput of cognitive radio with relaying capabilities |
| EP2248370A2 (en) * | 2008-02-14 | 2010-11-10 | Hong Kong Technologies Group Limited | Robust cooperative spectrum sensing for cognitive radios |
| WO2010005838A2 (en) * | 2008-07-11 | 2010-01-14 | Qualcomm Incorporated | Peer-to-peer device identification and cognitive communication |
| US20100103924A1 (en) * | 2008-10-27 | 2010-04-29 | Motorola, Inc. | Method and system for wireless multi-hopping communication |
| EP2373096A2 (en) * | 2008-12-24 | 2011-10-05 | LG Electronics Inc. | Method for selecting a relay station |
| WO2010083901A1 (en) * | 2009-01-22 | 2010-07-29 | Infineon Technologies Ag | Optimizing network wireless communication resources by means of relay stations |
| WO2010120149A2 (en) * | 2009-04-16 | 2010-10-21 | Lg Electronics Inc. | Method for processing traffic in unused band in an intermediate access point |
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| Publication number | Publication date |
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| GB201110630D0 (en) | 2011-08-03 |
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