Patent Application
20110125905
The present application relates to the field of infrastructure resources for wireless communication systems, such as a system of one or more nodes of such a wireless communication system, to corresponding methods for providing communication services in a wireless communication system, and to various elements of such infrastructure resources that may be involved in such methods.
Radio spectrum available for communication services is limited and needs to be used efficiently. Communication systems are mainly subject to frequency spectrum licensing. This means that entities that want to operate a wireless communication system have to first obtain a spectrum license for a frequency range that allows to operate communication devices (e.g. base stations, nodeBs, access points) that use this spectrum range. Such a spectrum license has a certain life time, a regional validity (for mobile communication networks typically bound to the area of the country) plus other boundary conditions, like the maximum output power or power density that may be used, the maximum interference that may be caused to adjacent frequency bands, etc. Often a license is bound to the services that may be serviced with the communication system (e.g. broadcast, telephony or mobile communication services); it may also imply regulatory requirements (e.g. the license obligates the licensee to provide coverage/capacity of services within a certain time to a certain percentage of the population/users or licensed area). In some spectrum regions unlicensed (or license-exempt) use of spectrum is possible (e.g. in the spectrum bands used by Wireless LAN, Bluetooth, etc.) In this case transmission is typically reduced to low power levels to avoid interference with other systems. If too many systems are operated in proximity simultaneously, substantial interference between those systems exists, and can in the extreme make them unusable.
A spectrum license provides an operator with the exclusive right of usage of the licensed spectrum ranges during the life time of the license. Based on this knowledge, the operator invests in communication infrastructure to provide communication services. Spectrum licenses are typically assigned for long time periods, e.g. 20 years, and regulatory rules of spectrum usage are internationally coordinated. This leads to large time frames in the order of decades for assigning new spectrum licenses which can then be used by new communication systems.
The slow allocation of spectrum licenses combined with the coupling of a license to a certain communication (i.e. transmission) system (like UMTS, GPRS, CDMA2000, LTE, WiMAX) leads to a slow pace of technological evolution of the transmission system being used in a licensed spectrum range. As a result, the transmission system that is being used is often already outdated in technical features (like transmission efficiency, cross-layer optimization techniques, smart antenna schemes, scheduling, error recovery, security mechanisms, routing, relaying, mobility management, channel coding or joint source-channel-coding, etc.). The technical development cycle of advanced communication concepts is faster than the cycles of spectrum licensing, or the pace in which communication systems operated in licensed spectrum are evolved in tedious standardization processes.
Another problem is that the installation of communication system infrastructure requires huge investment costs; these costs are in particular high in the access networks (like e.g. mobile and wireless networks) which provide access for the end-user to the core infrastructure. This high investment costs also prohibits or slows down the introduction of new networking features. As different communication systems are specified in an integrated system specification there is little possibility of reusing infrastructure between different communication systems. For example, it is not possible to reuse existing network nodes of UTRAN (UMTS) communication system for building a new EUTRAN (LTE) communication system. Some concepts of network sharing or infrastructure sharing exist for 3GPP networks; however, these schemes allow different operators only to have separate relationships to the end user (e.g. have different subscriptions schemes, tariffs, etc.)—it does not enable operators of the shared network to use different communication technologies in the shared network; the communication system is the same for all operators sharing a network/infrastructure.
For all these reasons the technological development of communication systems is hampered, which leads to system inefficiencies as the technological potential is not exploited. As the licensing process and the network installation process take a long time, it happens often that licensed spectrum is not fully utilized by the licensee, which leads to inefficient spectrum usage.
Some approaches exist that try to overcome these problems. One approach taken is generally denoted as cognitive radio (CR). CR assumes that different radio systems are not bound to spectrum. They all compete for the same spectrum. Spectrum coordination is made by different systems sensing if others systems are using a targeted spectrum band and then either sharing the spectrum resources according to a spectrum etiquette, or searching and reconfiguring for new frequency bands. This makes long-term spectrum licensing unnecessary, as different communication systems all can use different frequency ranges and automatically adapt to the existence of further communication systems.
CR can partly overcome the above stated problems, however, there are limitations and some problems remain open:
Another approach to overcome the problem is based on so-called secondary licensing, as e.g. proposed in V. Brik, A. Mishra, S. Banerjee, P. Bahl, Towards an Architecture for Efficient Spectrum Slicing, HotMobile 2007, Tucson, Ariz., (February 2007). In this case it is still assumed that some licensee is awarded a spectrum license from a regulator. However, the licensee can distribute the licensed spectrum further to other entities on a secondary market (either directly or via a spectrum broker). This process can be realized in an auction, which means that multiple interested buyers of spectrum bid for spectrum according to the auctioning rules.
To give an example, a licensee may receive a license from a regulator (e.g. for 3 carriers). The licensee can then sell e.g. one carrier on secondary market (via a spectrum broker or directly), possibly using a spectrum negotiation protocol. The spectrum buyer can bid for spectrum for a certain location and a certain time span, resulting in interference-free short-term spectrum allocation.
A result of the bidding process is that a part of the spectrum of the original license holder is sold to a spectrum buyer as a secondary license. The secondary license provides the spectrum buyer with exclusive access to the specified spectrum range, for a specified time, for a specified area, with possibly some additional boundary conditions (like a maximum power fence or interference level that is allowed at the edge of the area). Secondary licensing enables shorter licensing cycles as the license does not need to be generally harmonized by a regulator, but rather it can be freely determined by the licensee. Further, every buyer of a spectrum has a freedom to choose which communication system to use within the spectrum/area/time that he obtained the exclusive rights for in the secondary license. As a result, there is competition in the development of more capable communication systems. This is presented
Nonetheless, the approach of secondary licensing also has some problems. Every spectrum buyer has to install his own communication system infrastructure. As a result, the total costs for all communication systems in the area is very high; this can easily prohibit that a business case for a communication system based on a secondary license exists—thus prohibiting competition of technological evolution. Assuming a shorter life-time of secondary licenses, the infrastructure costs also need to be considered to provide a business case in a shorter time frame.
Another problem is that it has to be validated and enforced that the communication system of each spectrum buyer is operating in conformance with the secondary license (e.g. according to the spectrum range, the time period, the area that is covered by the secondary license). The enforcement has to be performed by the very same operator, who on the other hand has an incentive for violating the license. A method for the enforcement of a secondary license has been proposed by Brik et al. It requires that the secondary license policies are specified in a cryptographically protected certificate, and every device of the communication system (i.e. each node and terminal) has a tamper-proof and certified entity for enforcement of the secondary license. Such an approach dramatically increases the cost of the system, for it requires specialized tamper-proof hardware, a stringent certification process and environment for certification of the tamper-proof hardware, a cryptographic infrastructure that provides the secondary license certificates. But even then, it is doubtful if the license enforcement entity cannot be manipulated by hardware or software modifications.
To summarize, some of the problems are:
It is an object of the present invention to provide improvements in the field of wireless communication, especially with regard to efficient use of infrastructure resources and spectrum resources.
This object is solved by subject-matter of the independent claims. The dependent claims recite advantageous embodiments.
According to an embodiment, an infrastructure resource for a wireless communication system is proposed, said infrastructure resource being arranged to simultaneously provide different transmission system instances, each transmission system instance being independently and dynamically configurable.
The infrastructure resource may comprise one or more nodes of the wireless communication system. An example is schematically shown in
A basic concept of the invention is to provide a virtualization mechanism to a wireless communication system (a virtualized wireless communication system is also called ‘Virtual Radio” herein). The mechanism may be arranged such that it allows that different instances of transmission systems that can be independently and simultaneously realized on the same communication system infrastructure, and that the different instances of transmission systems (which will also be referred to as “slices” herein) can be independently and dynamically configured (e.g. via a so-called slice manager or transmission system instance manager or virtualization manager) in the way how transmission is performed. The slice manager or transmission system instance manager may be comprised within a virtualization manager. It is noted that the term “slice” refers to an instance of a transmission system, in contrast to the previously mentioned article by Brik et al., where the same term is used with a different meaning, namely there the term slice refers to a secondary license.
This transmission instance configuration can comprise for example:
a. identities being used for different communication elements (e.g. nodes, service identifier) and/or protocol instances (e.g. service access points, socket names), and/or names of connectivity elements (e.g. flow/bearer identifier, locators) and/or
b. transmission protocols and/or mechanisms being used (in particular for radio transmission), such as, link layer protocols like radio link control, medium access control, error correction by automatic repeat request or hybrid automatic repeat request, ciphering and integrity protection algorithms, header compression schemes and protocols, channel coding schemes, advanced antenna usage schemes (e.g. MIMO, space-time-coding, beam forming, multi-layer transmission), network layer protocols, transport layer protocols, cross-layer optimization techniques (e.g. joint source-channel coding, channel/resource adaptive transport layer congestion control), mobility management procedures and protocols (e.g. handover preparation, handover execution, data forwarding, context transfer), routing protocols (e.g. mesh-routing, MANET routing), power saving modes (e.g. discontinuous transmission and reception, idle mode, paging), quality-of-service management procedures and signaling protocols, relaying, network coding and/or
c. logical channels and transport channels that are used within the transmission instance and/or
d. control and management procedures and protocols, such as authentication, authorization, accounting, policy control, fault detection, performance monitoring, peering with external networks (including related business interface procedures) and/or
e. radio resource management procedures and protocols such as power control, link adaptation, adaptive coding and modulation, scheduling and resource allocation, quality-of-service insurance, congestion control, admission control, interference coordination, measurement control and radio resource control signaling.
It is noted that this list is by intention not exhaustive. One key point of the invention is that even new procedures—not yet developed at the time of the infrastructure build-out—can be configured for a transmission instance. This allows fast deployment of technical innovations. Different instances do not need to differ in all transmission procedures; they can in many cases be identical in most transmission procedures and differ in few (e.g. adaptive antenna usage, resource management and signalling, error recovery).
The transmission system instances are not only independent with respect to each other, they may also constitute distinct transmission systems towards users (i.e. mobile terminals), on account of the possibly different technical configuration of each transmission system instance. In other words, the mobile terminals see physically different transmission systems, although they are provided by the same infrastructure. In this sense the “virtualization” is to be understood as relating to the management and structuring of the infrastructure resource, but not to the provision of communication services, as the transmission systems seen by mobile terminals are actually different, due to the different configuration.
The virtual instantiation of node functionality running on an actual infrastructure (e.g. a network node) may also be called a virtual node (VN). Thus, the concept of the present invention provides for the possibility of having a plurality of virtual nodes generated by one actual node, and thereby when considering a plurality of actual nodes, distinct virtual networks consisting of virtual nodes provided by a common actual infrastructure.
Furthermore, the physical resources provided by the spectrum available for the communication system may be partitioned and allocated to the different transmission system instances (slices) according to the amount of resources that where requested at the instantiation of the transmission system slice. The allocation may be provided by a resource allocation control (RAC) function, which preferably also enforces that all instances (slices) obtain resources as negotiated with between the administrator of the slice (i.e. a system operator allowed to operate this slice or an entity that acts as administrator on behalf of the owner of the slice) and the slice manager. Thus, the transmission system instance manager may be arranged for independently and dynamically configuring the transmission system instances, where the resource allocation control function is also arranged for enforcing that each transmission system instance obtains resources as negotiated between the administrator of the transmission system instance and the transmission system instance manager. In order for a slice to use resources without being interfered by the usage of other resources by another slice, the access of slices to physical resources may be bound to a harmonized access resource scheme.
Examples of such a harmonized access resource scheme are listed below (note that several of these can be combined):
OFDM, DMT), where every slice is bound to using this modulation scheme and the partitioning is achieved by allocating different sub-carriers to the different slices. It is noted that the term “orthogonal” refers to any two carriers sufficiently distinct such that there is no appreciable interference between them. This is e.g. the case if mathematically orthogonal signal waveforms are chosen, but equally if two frequencies are separated by a sufficient guard band. Allocating different sub-carriers to the different slices ensures interference free operation of slices according to the orthogonality of the modulation scheme; and/or
and/or
Embodiments of the present invention will now be described with reference to the Figures, in which
a-3g show an example of an infrastructure resource instantiating a new transmission system instance and communicating with a system operator desiring to use the instance.
An embodiment of the invention may work as follows. An infrastructure operator (i.e. an operator who constructs and maintains the infrastructure for enabling wireless communication) obtains a spectrum usage rights (e.g. via a spectrum license) under the obligation to enable other communication service providers to provide communications services in the same spectrum (according to certain rules). This infrastructure operator provides a network infrastructure that enables communication services in the spectrum resource. The infrastructure supports that other providers (denoted as “system operators” herein, as they operate a transmission system on the shared infrastructure) can have access to the infrastructure via an interface (i.e. via a slice manager of an infrastructure node). Some negotiation process (e.g. a price setting process and a negotiation about the amount of resources and geographic distribution of resources) enables the system operator to obtain a certain share of spectrum resources from the infrastructure operator—this share is provided as a transmission instance administered by the system operator, and preferably the share is dynamically allocatable, i.e. the allocation may vary over time, e.g. depending on circumstances. The infrastructure resource can be such that each transmission system instance is independently administratable by a different transmission system operator.
It is noted that the infrastructure operator and at least one of the transmission system operators can be the same company or person. In other words, the present concept also lends itself to more efficiently operating different access networks (e.g. GSM and UMTS) by a given operator, who no longer needs to provide separate physical infastructures for this purpose.
The description refers sometimes to an instance of a transmission system which can be understood as an instantiation of a particular configuration of a transmission system (protocols, algorithms, identifiers, . . . ) that is running within one slice on a particular network node. The network node can contain multiple such instances of transmission systems which are running in different slices of the network node and share the same network node hardware/software without being aware of the existence of other slices (instances).
The interaction between system operator and infrastructure resource may be as follows. The infrastructure owner owns an infrastructure resource that has free capacity available. In addition, it may or may not have some slices instantiated already. In the following example given in
As shown in
As shown in
As shown in
As shown in
As shown in
Finally, as shown in
Thus, the following scenario becomes possible using the concept of the present invention. A spectrum licensee, who has access right to a defined part of a spectrum and/or to certain physical resources builds wireless communication infrastructure, thereby becoming an infrastructure operator. The infrastructure operator then provides access to the infrastructure and at least parts of the spectrum/physical resources to system operators, possibly due to e.g. a legal obligation. The wireless communication infrastructure is configurable with respect to a set of configuration parameters (where said set may be changed in time, e.g. due to new technologies implemented in the infrastructure, thereby possibly adding new configuration parameters), and the system operators can then configure their transmission system instances within the possibilities of the set of configuration parameters.
The system operators may install components for the system, allowing individual configuration of transmission modes (protocols, resource management, . . . ). Based on virtualisation, this allows innovation of new technologies and competition between system operators. Multiple concurrent systems (operated by different system operators) may share the same infrastructure, which leads to infrastructure sharing for cost efficiency. The spectrum licensee (infrastructure operator) may (dynamically) provide system resources to system operators, where the share per system operator may depend on negotiation between system operator and licensee. Furthermore, the spectrum licensee may enforce spectrum usage, as he controls the dynamic spectrum allocation (e.g. by scheduling), which leads to efficient/simple spectrum usage enforcement.
Via a configuration interface (e.g. provided by the slice manager) the system operator can configure the network elements of the infrastructure provider. The system operator can determine how the transmission system instance that he has obtained is configured; i.e. the transmission protocols, the object identifiers, the control and management functions and protocols, etc.
Once the transmission system has been configured in at least one node of the infrastructure, the transmission system can be used. For users of one instance (slice) of the transmission system, the system operator is perceived as the administrative entity of the system, even if the infrastructure belongs to the infrastructure provider.
System configuration can be done such that different transmission system functionality is provided via virtualisation and minimal coordination between systems is required for compatibility (e.g. modulation). The configuration can be done via a virtualisation management interface. An example is shown in
As shown at the bottom of
Specifically, the system configuration can be such that transmission in each sub-system (system operator) can differ significantly in terms of one or more of
Each slice 1 to 4 has the full functionality of a transmission system, with appropriate control plane and user plane, and with the corresponding protocol hierarchy. Thus, each slice runs like an independent transmission system as if it were the only transmission system on the given infrastructure, like in known systems in which infrastructure and transmission system are not separated by means of the virtualization concept of the present invention.
A more detailed example is schematically shown in
Returning now to the example of
Different types of access technologies can be described by this resource model. For example, for UMTS/WCDMA there is only one subcarrier, with the two remaining dimensions (time/code). For OFDMA systems (WiMAX, LTE) there is only one code, with remaining dimensions (time/frequency).
These dimensions allow partitioning of the resources in a TDMA (time), FDMA (frequency) or CDMA (code) dimensions. A fourth dimension that is not depicted in the diagram is a spatial dimension, when resources of the same physical resource block can be further subdivided into several independent spatial data streams. This can be achieved by multi-antenna techniques. This provides a fourth dimension for resource reservation based on SDMA (space).
Thus the physical resources may generally comprise at least one of a code resource, a time resource, a frequency resource, and a space resource. Code resources, time resources and frequency resources may be understood as spectrum resources.
The RAC allows multiple separate radio access technologies (provided in different slices) to use a common frequency band (resource) in a centralized-cooperative and compatible way with minimal interference between slices. To ensure that little interference occurs between slices, a harmonized resource access function 52 is preferable for the transmission system in every slice (examples have already been listed above). This also means that each virtual radio network (i.e. the collection of virtual nodes or transmission system instances associated with the same system operator, configured in the same way and using the same allocated physical resources) have a common compatible portioning of radio resources into resource blocks according to
There are different options on which physical resources can be used (allocated) for the transmission system of one slice. This can be e.g. negotiated at the slice instantiation between the system operator and the slice manager. It can be configured that a slice receives certain well-defined resources in the resource space, e.g. frequency subcarriers a,b,c,d in a certain time pattern. This means that the resource blocks for the slice are pre-defined. Another option is that a certain amount of total resources has been negotiated for a particular slice; the resource allocation control function determines dynamically (e.g. based on resources allocated to other slices and channel characteristics) which resource blocks are allocated to which slice. A signaling mechanism of the resource allocation control and the transmission system of the slice is then required, so that the transmission system can learn when and which resource blocks are allocated to it.
System usage can thus be such that resources are shared dynamically in the system under control of the virtualisation framework (RAC) of the spectrum licensee. This includes allocation of resource blocks to sub-systems (i.e. system operators) e.g. in the spectrum domain (sub-carrier) and/or time domain (slots) and/or signal domain (codes) and/or space domain (antennas/spatial layers). It furthermore includes coordination via common coordination channel and enforcement of negotiated resource share. The control process can be adapted to dynamic channel conditions, which leads to a more efficient usage of wireless spectrum. It is noted that the access system(s) can put some restrictions on dynamicity, e.g. request to have static frequency sub-carriers for some time, request for certain structure of sub-carriers, etc.
Configurable functionality of a virtual radio node (transmission system instance/slice) can comprise physical layer procedures, such as channel coding, smart antenna management (MIMO, beamforming) or cooperative relaying; it can be link layer functionality, like (hybrid) automatic repeat request (ARQ), space division multiple access (SDMA), header compression schemes, or ciphering; or it can be higher layer functionality such as end-to-end naming schemes, inter-domain gatewaying and routing, network coding and multi-path-routing, network storage, caching, congestion control proxying, application layer adaptation. Apart from data-plane functionality also control functions can be configured per virtual radio node, for example local routing and mobility management (incl. mesh and ad-hoc routing, mobility management optimization and context transfer), radio-resource management and scheduling (within the virtual radio), cross-layer design and optimization, authentication and authorization schemes, as well as battery-saving schemes like discontinuous transmission/reception and sleep modes.
There are different ways for a virtual network operator to program/configure and instantiate such functionality on a virtual node. A physical node can have a library of basic functional units; the virtual network operator can then compose the desired functionality by combining functional units—possibly allowing some user-defined extensions inherited from base functional units. A difficulty is that certain functions have high processing requirements and may require support by dedicated hardware (e.g. ciphering or MIMO). In this case only a limited set of configurable algorithms or procedures can be provided by the physical node, putting some limitation on the degree of configurability. Another approach is to make the virtual node freely programmable and a virtual network operator installs the desired software code. To support specific tasks different types of programmable processing entities can be provided by the physical node, ranging from general purpose processors to configurable logic like Field Programmable Gate Arrays (FPGAs).
The inventive approach allows radio access technologies (radio cells) to become logically part of different (wireless) network architectures.
The two transmission system instances running on the same infrastructure can be configured very differently, for example:
For the hierarchical mobile network,
For the hierarchical mobile network,
The disclosed concept of Virtual Radio enables different technology development cycles and new business models. The physical access to the spectrum—and the associated network infrastructure—can be used for a long time and can be provided by a separate infrastructure provider.
The transmission procedures and/or protocols for data transmission and management and control of data transmission is provided within slices at a different (faster) development cycle, and can be provided by different operators, like wireless virtualized network operators (system operators).
The basic concept of decoupling the basic infrastructure from the special configuration of the transmission system by instantiating different instances on the common infrastructure affords the advantage of decoupling the life cycles of long-term (static) frequency assignment (by licensing) and usage etiquette (modulation, power profiles, etc.) from short- or mid-term (dynamic and flexible) radio system usage (networking, applications, radio resource management (RRM) by virtualization. This enables new business models, such as creating the roles of infrastructure providers on the one hand who have long-term frequency/spectrum/resource licenses and provide infrastructure, and on the other hand of wireless virtualized network operators who lease slice-capacity from infrastructure providers and perform customized wireless network design. It becomes possible to apply the DSL-market business model to wireless communication. Furthermore, it becomes possible to migrate from the current access approach (Long Term Evolution, LTE), instead of having to take a clean-slate approach like with Cognitive Radio.
The present invention can also be embodied as a transmission instance manager or slice manager for an infrastructure resource of a wireless communication system, the infrastructure resource being controllable to simultaneously provide different transmission system instances, wherein the transmission instance manager is arranged to configure each transmission system instance independently and dynamically.
The present invention can furthermore be embodied as a resource allocation controller for an infrastructure resource of a wireless communication system, the infrastructure resource being controllable to simultaneously provide different transmission system instances, wherein the resource allocation controller is arranged for allocating physical resources of the wireless communication system such that each transmission system instance has a certain share of the physical resources.
Preferably, the resource allocation controller is furthermore arranged for enforcing that each transmission system instance obtains resources as negotiated with an administrator of the transmission system instance. Also, the resource allocation controller may be arranged such that the share of physical resources of each transmission system instance is dynamically allocatable. Furthermore, as previously described, the resource allocation controller may implement a harmonized access resource scheme for the access of the transmission system instances to the physical resources, the harmonized access resource scheme comprising one or more of a modulation scheme with orthogonal sub-carriers, a time scheduling scheme and a coded spectrum access scheme
The present invention can also be embodied in the form of a method, especially a computer implemented method, and therefore also relates to computer programs comprising portions of software code in order to implement the methods as described when executed in an infrastructure resource, in a slice manager or in a Resource Allocation Controller RAC. The respective computer programs can be stored on one or more computer readable media. A computer-readable medium can be a permanent or rewritable memory within a slice manager or a RAC, or located externally. The respective computer programs can be also transferred to the respective entities for example via a cable or a wireless link as a sequence of signals.
A method embodiment of the invention for controlling an infrastructure resource for a wireless communication system comprises simultaneously providing different transmission system instances, each transmission system instance being independently and dynamically configurable. This method can be embodied as a computer program and as a computer program product carrying the computer program.
Further method embodiments of the invention will now be described with reference to
The method of
More than only the first spectrum resource, e.g. a second spectrum resource, can be selected from the spectrum resource and allocated to the first instance. The transmission infrastructure can then be configured accordingly, i.e. to be capable of transmitting data associated with the first instance via the second spectrum resource. Then, access can be provided to the first instance for transmission of data associated with the first instance via the second spectrum resource and the accordingly configured transmission infrastructure resource. Data associated with the first instance may be sent via the first spectrum resource and the configured transmission infrastructure resource and via the second spectrum resource and the accordingly configured transmission infrastructure resource, e.g. parallel in time but preferably without interfering.
Additionally or alternatively, further transmission system instances can be instantiated and associated with a corresponding part of the overall spectrum resource, e.g. a second spectrum resource can be selected from the spectrum resource and allocated to a second instance (e.g. a second system operator). The transmission infrastructure can then be configured accordingly, i.e. to be capable of transmitting data associated with the second instance via the second spectrum resource. Then, access can be provided to the second instance for transmission of data associated with the second instance via the second spectrum resource and the accordingly configured transmission infrastructure resource. Data associated with the first instance may be sent via the first spectrum resource and the configured transmission infrastructure resource and data associated with the second instance may be sent via the second spectrum resource and the accordingly configured transmission infrastructure resource, e.g. parallel in time but preferably without interfering.
The first (or second, third, etc.) spectrum resource and the configured transmission infrastructure resource constitute a respective slice, i.e. they provide the basis for instantiating a respective transmission system instance.
As described previously, the first (or second, third, etc.) spectrum resource may be selected according to a specification of the respective instance, i.e. a specification can e.g. be provided as a part of a request from system operator (see e.g. discussion of
The first spectrum resource and the configured transmission infrastructure resource may be associated with at least one identifier. Preferably, each part of the overall spectrum resource allocated to a respective transmission system instance is associated with a corresponding identifier. The method of the embodiment may comprise the step of sending the at least one identifier (or at least one indication thereof) to the first instance, and equally the sending of each respective identifier to the corresponding instance.
The configuration step further may comprise at least one of the steps of
The method may be such that the spectrum resource comprises at least one of a code resource, a time resource, and a frequency resource being selectable.
The first instance may be a communication service provider, i.e. the instantiated transmission instance is fixedly associated with a given service provider, who thereby effectively becomes a system operator, although he does not have to have any infrastructure resources of his own.
The method steps can be implemented in any suitable or desirable way within the infrastructure resource, and at least one of the steps can e.g. be performed by the previously described slice manager/transmission system instance manager.
Another method embodiment will now be described with reference to
The first spectrum resource and the configured transmission infrastructure resource may thus constitute a slice, i.e. they provide the basis for instantiating a respective transmission system instance.
The allocation is preferably according to a harmonized access resource scheme. Furthermore, the presently described method relating to allocating resources preferably comprises the step of enforcing that the data transmission for the first instance is according to the allocated physical resource block and the configured transmission infrastructure resource.
The invention may be further embodied according to the following examples which can fully or in part combined with the features of previously described embodiments and any of the claimed concepts.
Embodiments of the invention can thus provide a framework for coordinated sharing of wireless resources and infrastructure among multiple virtual networks.
Furthermore, flexibility and evolvability may be provided by enabling the simultaneous use of multiple optimized link-layers for diverse applications on top of the same resource.
This may enable:
A comparison of the Virtual Radio (VR) concept with the Cognitive Radio (CR) concept shows the following. In VR resource portioning can be centralized (e.g. due to the central coordination provided by the RAC for all of the transmission system instances on the infrastructure resource), like for centralized scheduling. In CR resource portioning is distributed, like carrier-sense multiple access (CSMA). In VR, a resource provider (infrastructure provider) distributes resources to wireless operators (transmission providers), whereas in CR wireless operators share resources, which leads to problems in etiquette enforcement. While VR operates with specific radio, in which only upper (software) parts need to be configurable, CR requires software-reconfigurable radio, which adds hardware complexity leading to more costly nodes and terminals. In terms of expected efficiency, VR allows efficient resource sharing and is predictable due to admission of new slices, whereas CR creates considerable overhead for distributed spectrum sharing and is unpredictable due to an unknown number of systems targeting a given spectrum resource. Finally, in terms of terminal complexity, terminals in VR can already operate even if they only support one slice (one technology), whereas CR terminals need to support the full CR flexibility.
The introduction of radio network virtualization can revolutionize the evolution and usage of wireless networks. It enables an acceleration of the innovation cycles of wireless transmission concepts and eases extensibility and evolution of wireless networks. It allows for infrastructure sharing, which may allow reducing network deployment costs and thus also the price per transmitted bit. Further, it allows customization and pluralism of networks: a virtual radio network targeted at machine-to-machine or sensor applications can be adapted to these applications and requirements, while at the same time another virtual radio network is optimized for providing Internet services to mobile users. The flexibility of virtualization provides a means for migration from one network design to another. For the new design a new virtual network is created in parallel to the old design. Initially (e.g. when few end users own devices that support the new design) a small amount of resources is allocated to the virtual network of the new design; at a later phase few resources are allocated to the virtual network of the old design, before it is eventually deleted. Similarly, virtual networks can be used for experimentation of new radio networks designs, running on real infrastructure yet isolated from other operational virtual networks, and limited in scope but still affordable due to reuse of existing infrastructure.
Apart from technical merits, network virtualization can lead to new business roles by separating the operation of the physical infrastructure from the operation of the networking service. This decouples the life cycles of infrastructure build-out and network service deployment;
on a given infrastructure a larger variety of customized networks can be provided (limited only by the capabilities of the physical nodes and links). For example, the build-out of physical infrastructure determines what amount of networking capacity is available at different regions. In an open market situation with separate infrastructure and virtual network providers, infrastructure build-out will only happen where virtual network operators foresee a significant demand and request infrastructure availability. This may lead to regions (like rural areas) where it is economically unfeasible to provide network capacity and networking services. The provision of network infrastructure could then still be provided, e.g. due to a political objective to reduce the digital divide; infrastructure could, for example, be subsidized with taxes or it could even be state-owned. Competition between virtual network operators could then happen on the basis of the provided networking service.
The invention has been described with reference to specific embodiments that serve the purpose of better understanding the invention, but which are not intended to be limiting in any way, as the invention is defined by the appended claims.
| Filing Document | Filing Date | Country | Kind | 371c Date |
|---|---|---|---|---|
| PCT/EP2008/065621 | 11/14/2008 | WO | 00 | 11/8/2010 |
| Number | Date | Country | |
|---|---|---|---|
| 60992434 | Dec 2007 | US |
