Patent Application
20060221933
This invention relates generally to telecommunications, and more particularly, to wireless communications.
Internet offers different types of communication services to users of wireless or mobile communication devices. A variety of communication and network protocols may be used to provide such communication services. One emerging communication service is Internet Protocol (IP)-based wireless telephony over IP, popularly known as voice over IP (VoIP). The Internet Protocol refers to a set of communications protocols that implement a protocol stack on which the Internet operates.
However, the Internet Protocol was designed to be used with packet-switched communication networks and, as originally designed, does not provide the characteristics necessary to support voice and video transmission. The lack of control over the amount of connections supported leads to highly variable delays for packets and often to packet loss. Moreover, transmission of most real-time multimedia streams over an IP network demands higher bandwidth with specific timing requirements, such as lower delay tolerance and higher end-to-end delivery guarantees than other non-IP data.
In the IP network, Quality of Service (QoS) defines the ability to compensate for traffic characteristics without compromising average throughput. One difference between conventional telecommunications networks and IP networks is that without explicit compensation for signaling packet transport, a particular QoS mechanism cannot ensure the reliable delivery of call-signaling messages. The telecommunications networks physically segregate signaling traffic on carefully calibrated, highly redundant networks.
The 3rd generation (3G) mobile communication system, namely Universal Mobile Telecommunication System (UMTS) supports multimedia services according to 3rd Generation Partnership Project (3GPP) specifications. The UMTS also referred as Wideband Code Division Multiple Access (WCDMA) includes Core Networks (CN) that are packet switched networks, e.g., IP-based networks. Because of the merging of Internet and mobile applications, the UMTS users can access both telecommunications and Internet resources. However, the IP-based networks may not be multimedia oriented. Therefore, Quality of Service (QoS) may become a critical issue for the success of UMTS when providing an end user with a desired QoS if the IP-based network resources at various nodes are underutilized in provision of UMTS services.
Wide spread usage of the 3G mobile communications systems, such as UMTS or CDMA2000 has made the presence of next generation networks (NGN) inevitable. According to the International Telecommunication Union (ITU), a NGN is a packet-based access network that is capable of providing services including telecommunication services using multiple broadband, quality of service (QoS)-enabled transport standards. The ITU defines the QoS as the collective effect of service performance which determine the degree of satisfaction of a user of the service. It means it is the end user that decides whether he is satisfied with the provided QoS or not. Next generation networks are expected to provide users with high end-to-end quality (high data rate, high coverage, new services etc.) mobile internet applications. Beside these demands, one challenge of the next generation networks is to use of heterogeneous mobile communications comprising, for instance, 3G mobile system standards and IEEE 802.xx standards (e.g., WLAN, WIMAX).
To provide an end-to-end service to users, a UMTS network may deploy a UMTS bearer service layered architecture specified by Third Generation Project Partnership (3GPP) standard. The provision of the end-to-end service is conveyed over several networks and realized by the interaction of the protocol layers. The resource management may affect provision of UMTS bearer services. To provide QoS effectively, several resource managers are employed throughout the whole network. Thus, resource management is important in provision of end-to-end QoS. The interference management within one cell and Radio Network Controller (RNC) resource management are equally important. Acting as the gateway interfacing the external networks and radio networks, the RNC controls more resources than base stations (Node Bs) and co-ordinates the service requirements from both the mobile stations and the external networks.
Specifically, an entire network autonomously manages the resources of the core network (fixed), the resources in the fixed portion of the radio access network (wired) and the resources of the wireless access portion. That is, a converged network performs a dedicated resource management that is specifically designed to fulfill its specific requirements and constraints for each individual portion of the network. Moreover, the wired together with the wireless portion are implemented by different radio access system standards (e.g., UMTS or IEEE 802.xx). Each radio access system performs its own system specific resource as well as mobility management. For radio access systems inter-working across the wired and the wireless portions, two of the common conventional resource and mobility management schemes manage a vertical handover across the different radio access systems by means of a centralized mobility management entity or another vertical handover is performed by dedicated interfaces between any two radio access systems. Each inter-working pair uses a pair specific interface, ie., Ia, Ib, and Ic.
However, a dedicated fixed/wired/wireless system specific resource management scheme in a converged network scenario may be inflexible and inefficient to implement because use of different radio access technologies via dedicated inter-working interfaces may cause a redesign of an existing interface for each instance of integration of novel radio access systems or already existing systems, such as Digital Video Broadcast (DVB). That is, interfaces Ib and Ic have to be redesigned whenever an integration of a novel future radio access system is desired.
Furthermore, as these interfaces are expected to ensure no packet loss and should meet delay constraints of a user specific service during transition time from one radio access system to another, it is very likely that interface specifications increase overall complexity of next generation networks. To sum up, such an NGN architecture that utilizes radio access system interfaces offers another inflexible and inefficient solution similar to the dedicated fixed/wired/wireless system specific resource management of radio access system set forth above. Therefore, this dedicated approach to resource management in next generation networks cannot support users with multiple connections that may be simultaneously active via different communication interface technologies for wireless and/or wireline communication links.
The present invention is directed to overcoming, or at least reducing, the effects of, one or more of the problems set forth above.
The following presents a simplified summary of the invention in order to provide a basic understanding of some aspects of the invention. This summary is not an exhaustive overview of the invention. It is not intended to identify key or critical elements of the invention or to delineate the scope of the invention. Its sole purpose is to present some concepts in a simplified form as a prelude to the more detailed description that is discussed later.
In one embodiment of the present invention, a method is provided for managing one or more Internet Protocol based resources in a packet-based access network. The method comprises enabling at least one of a first wireless connection over a first interface and a second wireless connection being simultaneously active over a second interface for a particular user, distributing information indicative of transport of a plurality of packets during a specific service of the particular user across the first and second wireless connections and at least one wireline connection, and selecting at least one connection from the first and second wireless connections and the at least one wireline connection based on the information associated therewith to determine routing of the plurality of packets in the packet-based access network.
In another embodiment, a wireless router is disposed at a base station to commonly manage one or more resources of a packet-based access network across a wireless network portion and a fixed, wired network portion thereof. The wireless router comprises a first interface to keep active a first connection with a wireless communication device for a particular user thereof, a second interface to simultaneously keep active a second connection to the wireless communication device for jointly managing the one or more resources on a network layer, each interface of the first and second interfaces enables a different type of Internet protocol-based access, and a storage storing instructions to analyze transport of the plurality of packets across the wireless router during a specific service of the particular user for forwarding the plurality of packets based on an Internet protocol-based strategy being utilized on the network layer.
In yet another embodiment, a communication system may commonly manage one or more resources to determine routing of a plurality of packets for a particular user on a network layer of a packet-based access network across a fixed, wired network portion and a wireless network portion thereof. The communication system comprises a first and a second wireless router associated with the wireless network portion. Each wireless router of the first and second wireless routers may enable at least one of a first connection active over a first interface and a second connection being simultaneously active over a second interface such that each interface of the first and second interfaces provides a different type of Internet protocol-based access. A particular one of the first and second wireless routers may selectively communicate with a wireless communication device over any one of the at least one of the first connection active over the first interface and the second connection being simultaneously active over the second interface. The particular one of the first and second wireless routers may analyze transport of the plurality of packets between the first wireless router and a first Internet protocol-based router associated with the fixed, wired network portion of the packet-based access network during a specific service of the particular user for forwarding the plurality of packets based on an Internet protocol-based strategy being utilized on the network layer.
In still another embodiment, an article comprising a computer readable storage medium storing instructions that, when executed cause a communication system to enable at least one of a first wireless connection over a first interface and a second wireless connection being simultaneously active over a second interface for a particular user to manage one or more Internet Protocol based resources in a packet-based access network, distribute information indicative of transport of a plurality of packets during a specific service of the particular user across the first and second wireless connections and at least one wireline connection, and select at least one connection from the first and second wireless connections and the at least one wireline connection based on the information associated therewith to determine routing of the plurality of packets in the packet-based access network.
In one illustrative embodiment, an apparatus may manage one or more Internet Protocol based resources in a packet-based access network. The apparatus comprises means for enabling at least one of a first wireless connection over a first interface and a second wireless connection being simultaneously active over a second interface for a particular user, means for distributing information indicative of transport of a plurality of packets during a specific service of the particular user across the first and second wireless connections and at least one wireline connection, and means for selecting at least one connection from the first and second wireless connections and the at least one wireline connection based on the information associated therewith to determine routing of the plurality of packets in the packet-based access network.
The invention may be understood by reference to the following description taken in conjunction with the accompanying drawings, in which like reference numerals identify like elements, and in which:
While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof have been shown by way of example in the drawings and are herein described in detail. It should be understood, however, that the description herein of specific embodiments is not intended to limit the invention to the particular forms disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.
Illustrative embodiments of the invention are described below. In the interest of clarity, not all features of an actual implementation are described in this specification. It will of course be appreciated that in the development of any such actual embodiment, numerous implementation-specific decisions may be made to achieve the developers' specific goals, such as compliance with system-related and business-related constraints, which will vary from one implementation to another. Moreover, it should be appreciated that such a development effort might be complex and time-consuming, but may nevertheless be a routine undertaking for those of ordinary skill in the art having the benefit of this disclosure.
Generally, a method and apparatus is provided of performing resource management in next generation networks. To ensure a relatively high end-to-end service quality, the method and apparatus defines one or more user-service specific metrics being utilized by Internet Protocol (IP) mechanisms on a network layer to provide an IP-based resource management in a next generation network. In context with next generation networks, a wireless router, such as a wireless router may provide wireless radio access using a resource management that captures one or more properties of a wireless link and a network link as metrics that may be used by IP mechanisms. In a radio access system fixed/wired/wireless partitioning of a network enables commonly managing all resources of the entire network (fixed/wired/wireless). The resource management is performed on the network layer to be independent of a link layer. A common resource management software may comprise a wireless access module that utilizes metrics that gather wireless link and network link properties. One or more metrics used for performing resource management may be user-and-service specific to obtain a relatively high end-to-end user Quality of Service (QoS). For a link, instead of depending upon a single link metric, information of per user-service metrics from all wireless and/or wireline or network links in a converged administrative IP domain may be used. Thus, one single link may be associated with more than one metric per specific user of particular service. These metrics information may then be managed by IP-based mechanisms. Therefore, the common resource management software may treat any wireless radio link as “one more IP hop.” In this manner, a wireless router may perform resource management of the Internet Protocol based resources in a next generation network. By enabling simultaneously active connections over a multiplicity of air or wireless interfaces and/or wireline interfaces at the wireless router, a desired Quality of Service (QoS) may be provided to a particular user during a specific service on packet-based cellular communications with a wireless communication device of a future mobile system.
Referring to
One example of the packet-based access network 100 is a next generation network (NGN). In the NGN, service-related functions may be independent from underlying transport infrastructure. The NGN may offer an unrestricted access by users to different service providers. The NGN may support generalized mobility that allows a consistent and ubiquitous provision of services to users. The NGN may seamlessly handle convergence of the wireless and the fixed, wired infrastructure, ensuring a desired quality of service (QoS) on the Internet, for example. The QoS generally causes network elements to discriminate across traffic streams, treating each stream in a predefined manner based on performance constraints. The NGN may be related to any one of the 2G, 3G, or 4G standards and employ any one of the protocols including the UMTS, CDMA200, GSM, Bluetooth or the like. However, use of a particular standard or a specific protocol is a matter of design choice and not necessarily material to the present invention.
As one example, the IP-based communications in the packet-based access network 100 comprise packets of information that carry real-time multimedia streams of data, voice, and video across a wireless network portion and/or a fixed, wired network portion thereof. In one embodiment, the wireless routers 105(1-N) may cause packet forwarding in such real-time multimedia streams of such IP-based communications for an overall network performance or an end-to-end service provision. To handle several kinds of wireless and wired technologies, over the wireless network and/or the fixed, wired network portions each wireless routers 105 may include various integrated communication interface(s), such as wireless interfaces and/or wireline interfaces.
More specifically, each wireless router 105 may comprise one or more such integrated communication interface(s) including wireless interfaces and/or wireline interfaces to simultaneously support connections based on a host of mobile communication standards, e.g., UMTS, IEEE 802.xx, GSM, and Bluetooth associated with different types of IP-based communications with a wireless communication device 115. For example, the third wireless router 105(3) may comprise a first interface (I/F) 120(1) to keep active a first connection with the wireless communication device 115 for a particular user thereof, a second I/F 120(2) to simultaneously keep active a second connection to the wireless communication device 115, and a third I/F 120(3) to simultaneously keep active a third connection to the wireless communication device 115. Specifically, the first wireless router 105(1) may keep active a first wireless link 122(1) with the wireless communication device 115 for a particular user thereof and the second wireless router 105(2) may simultaneously keep active a second wireless link 122(2) to the wireless communication device 115. An example of the first and second wireless links 122(1-2) includes a wireless IP-Hop. Measurements of the first and second wireless links 122(1-2) properties may be performed in a corresponding wireless router, i.e., the first wireless router 105(1) and the second wireless router 105(2), respectively.
Each interface 120 may enable a different type of Internet Protocol based access to the converged network 100. The third wireless router 105(3) may jointly manage the one or more Internet Protocol based resources on a network layer of a protocol stack. The network layer may be the third layer or Layer 3 of an Open Systems Interconnection (OSI) model which maintains network protocol addresses (as compared to media access control (MAC) addresses) for transmitting messages to selected destinations. Because at the network layer routing of packets occurs based on one or more high-level network protocols, the network layer is responsible for addressing and delivery of packets across converged network 110, such as a wireless-enabled Internet.
For example, the wireless router 105 may be a device capable of connecting a wireless local area network (WLAN to a LAN and/or a virtual LAN. Each wireless router 105 may control the routing of packets from a source to a destination and may provide alternate paths when necessary. Each wireless router 105 may read network layer addresses of the transmitted packets; and only forward packets of information those addressed from one wireless network to another wired or fixed network.
The converged network 110 may comprise a first, second, and a third Internet protocol-based routers 125(1-3) associated with the fixed, wired network portion of the packet-based access network 100. For example, the Internet protocol-based router 125 may be an ATM-based router that integrates an IEEE 802.xx based wireless Ethernet access point and a 10/100 Base-T Ethernet switching hub. A transport property of the first wireless link 122(1) and a network link 127 between the first wireless router 105(1) and the first Internet protocol-based router 125(1) may be captured in a metric, associated with a specific service for a particular user of the wireless communication device 115. Examples of the transport property of the first wireless link 122(1) and the network link 127 include bandwidth, delay, jitter, and packet loss. Measurements of the network link 127 properties may be performed in the Internet. However, besides in the Internet, the calculation of the metric may be carried out also in the first wireless router 105(1) based on the MAC-layer information.
The wireless communication device 115, for example, user equipment (UE) may comprise a conventional transceiver 135 coupled to a controller 140, in turn, coupled to a storage 145 storing instructions, such as a client module 150 to communicate with the converged network 110. The wireless communication device 115 may take the form of any of a variety of devices, such as mobile terminals including cellular phones, personal digital assistants (PDAs), laptop computers, digital pagers, wireless cards, and any other device capable of accessing the converged network 110.
While many access technologies have been standardized, management of the entire resources of such a technology comprehensive network, i.e., a NGN is a challenging task. In particular, not only a resource management task has to be access technology agnostic, easy to handle but should be able to support high end-to-end QoS. For performing resource management, in one embodiment, the wireless routers 105(1-N) may combine fixed, wired and wireless link characteristics and leverage given protocol mechanism, i.e., the Internet Protocol. Specifically, the Internet protocol may be used with the packet-switched communication network 100 as a network layer protocol for interconnecting systems, which may support voice and video transmission along with data communications.
Examples of the Internet Protocol include a version four of the Internet Protocol (IPv4) and a version six (IPv6). The IPv4 uses 32-bit unique addresses that can be allocated as public Internet addresses and is described in IETF RFC 791, published in September, 1981. The IPv6 uses 128-bit address to support up to about 3.4×1038 public Internet addresses. To assist with router processing, the IPv6 packets include a label that provides a quality of service (QoS) indication for priority applications, such as real-time video and voice. The 128-bit address space of the IPv6 may support many types of devices such as telephones, automobiles, and the like when forming connections on the Internet using a flow ID in a packet header to identify flows.
To perform resource management, the wireless routers 105(1-N) may use a variety of identification schemes to resolve IP addresses for the purposes of routing packets in the NGN that includes an IP network. An IP network comprises logical layers from application to physical layers for network elements to provide an end-to-end service for network traffic. Since the IP network mixes bearer and signaling traffic on a single channel, per-stream or per-packet considerations may not be taken into account.
The wireless routers 105(1-N) may extend QoS models to wireless cellular networks arena on an IP network, significantly improving system performance and capacity while maintaining the QoS of multimedia traffic. Generally, resource management is used to control resource usage by managing one or more resources to avoid resource contention which may occur between two or more entities that desire the same resource at the same time. For example, a cellular system may manage radio resources to provide voice services. By performing resource management of radio resources, for example, IP-based QoS provisioning may be enabled where IP-based QoS requirements may involve service guarantees and/or service differentiation of throughput, delay, delay variation (jitter), loss and error rates, security guarantees, and the like.
Using an Internet Protocol, one or more services including a telecommunication service in multiple broadband, quality of service (QoS)-enabled transport channels may be provided on the packet-based access network 100 that includes a wireless network portion and a fixed, wired network portion. The transport of the plurality of packets within the fixed, wired network portion may be analyzed. Each interface of the first and second interfaces 120(1-2) may enable a different type of Internet protocol-based access to the wireless communication device 115.
The packet-based access network 100 may use a first broadband signal over a first channel to carry a first multimedia content including voice, video or data simultaneously with a second broadband signal over a second channel having independent bandwidth than used for the first channel to carry a second multimedia content including voice, video or data. At least two quality of service (QoS)-enabled transport strategies may be provided for each of the different first and second channels. In this way, the plurality of packets may be communicated in real-time within a multimedia traffic stream between the wireless communication device 115 and at least one of a wireless and a wired local area network within the packet-based access network 100.
To converge the packet-based access network 100 and the at least one of a wireless and a wired local area network into an Internet protocol-based (IP) network, a first resource of the one or more Internet Protocol based resources in the packet-based access network 100 may be merged with a second resource of the one or more Internet Protocol based resources in at least one of a wireless and a wired local area network. For the purposes of leveraging the wireless router 105, e.g., a base station router, each for the first and the second wireless routers 105(1-2) may attach a user via at least two different interfaces 120 simultaneously for a common resource management. One or more wireless links including a first wireless link from the first wireless router 105(1) to the wireless communication device 115 may be treated as an Internet protocol hop.
To a plurality of users on the one or more wireless links that remain simultaneously active via any one or more of the one or more of different interfaces 120 available at the first wireless router 105(1) may be provided. That is, these Internet Protocol based resource(s) including a first and a second radio access resource may be commonly managed in the packet-based access network 100 by comparing at least one of a multiplicity of constraints associated with the specific service for a particular user against the Internet protocol-based Quality of Service (QoS) criteria and meeting at least one of a multiplicity of constraints of a specific service for a particular user during a transition time from the first radio access resource to the second radio access resource.
Turning now to
Consistent with one embodiment, the wireless router 205 may further include a conventional radio network controller (RNC) 220 coupled to a packet data serving node 225 that includes a foreign agent (FA) 230. A storage 235 may store a common resource managing software (S/W) 240 to route packets over the first, second, or third interface 120(1-3) defined at least in part by the UMTS standard, the IEEE 802.xx standard, and a future mobile system (FSM) standard, respectively. The wireless router 205 may be coupled to an IP core 245 which links the plurality of mobile or wireless communication devices 115(1-M) to the Internet 250 through a home agent (HA) 255. The IP core 245 may couple to an Authentication, Authorization and Accounting (AAA) unit 260 and a session initiation protocol (SIP) server 265. A dynamic host configuration program (DHCP) 270 may be coupled to a domain name service (DNS) 275 that in turn couples to the IP core 245.
The RNC 220 as a network component within the cellular communication system 200 may control flow of the mobile communications, especially packets based on the common resource managing S/W 240. To this end, the RNC 220 may use the PDSN 225, which functions as a connection point between the Radio Access and IP networks. The FA 230 in the cellular communication system 200 provides a network contact point between a mobile or wireless communication device 115 and the rest of the network. The FA 230 may provide an endpoint for packets that are tunneled to the mobile or wireless communication device 115 from the Home Agent 255. In conjunction with the PDSN 225, the HA 255 authenticates Mobile IP registrations from the client module 150 as shown in
The AAA unit 260 provides a remote access security that controls network access by requiring user identification and restricting access to only particular resources, and maintains records of use for billing and network audit. The AAA unit 260 may enable network security services that provide a primary framework to set up access control on the base station router or access server. The SIP 265 server may provide telephony services using distributed resources for creating multimedia applications, including voice over IP (VoIP). While the DHCP 270 being a conventional protocol may assign dynamic IP addresses to the plurality of mobile or wireless communication devices 115(1-M) in the cellular communication system 200, the DNS 275 being a conventional Internet service may translate domain names to or from IP addresses for use on the Internet 250.
Referring to
In one embodiment, the network layer may have an associated Internet Protocol based strategy. Examples of the queuing QoS strategies include a first-in first-out (FIFO) strategy to forward packets in the order of their arrival, a priority queuing strategy to allow prioritization of traffic on a predefined criteria, a custom queuing strategy may allocate a specific amount of a queue to each class while leaving the rest of the queue to be filled in a round-robin fashion, a weighted fair queuing strategy may schedule interactive traffic to the front of the queue and share the remaining bandwidth among high-bandwidth flows, a class-based weighted fair queuing strategy may combine custom queuing and weighted fair queuing, and a low-latency queuing strategy may use a strict priority queuing to give delay-sensitive data, such as voice a preferential treatment over other traffic.
Examples of the reservation, allocation, and policing QoS strategies include a resource reservation protocol (RSVP), a signaling protocol that provides a reservation setup and controls for the resource reservation that integrated services indicate. The hosts and routers use the RSVP to deliver QoS requests to routers along data stream paths and to maintain router and host state to provide a requested QoS based on bandwidth and latency, a real-time protocol (RTP) may prioritize voice traffic packets, a committed access rate strategy may provide a traffic-policing to allocate bandwidth commitments and limitations to traffic sources and destinations while specifying policies for handling traffic that exceeds the bandwidth allocation.
The protocol stacks 305(1-2) may further comprise a Point-to-Point Protocol (PPP) layer 320, which provides a communications protocol that turns a dial-up telephone connection into a point-to-point Internet connection used to run world wide web (WWW) browsers over a phone line. Another layer common to the protocol stacks 305(1-2) may be Radio Link Protocol (RLP) layer 325, which is a protocol used over the interface.
A Medium Access Control (MAC) layer 330 may be also be shared across the protocol stacks 305(1-2). The MAC layer 330 may provide a networking protocol to handle transmission requests, authentication and other overheads in local area networking by being a portion of a data link layer that controls access to a communication channel. The MAC layer 330 is specified in the IEEE 802.xx standard for medium sharing, packets formats and addressing, and error detection. An air link layer 335 may specify a forward radio frequency (RF) channel directed from the converged network 110 to the wireless communication device 115 a reverse RF channel directed from the wireless communication device 115 to the converged network 110, as shown in
The protocol stacks 305(2-3) may comprise a physical (PHY) layer 340; the lowest layer in a network communication model for wireless networking may define use of signal modulation and RF transmission. The PHY layer 340 corresponds to a radio front end and baseband signal processing section and may define parameters, such as data rates, modulation, signaling, transmitter/receiver synchronization, and the like. In the case of wireless communications, the PHY layer 340 defines a transport medium, i.e., communication interface. A link layer 345 of the protocol stacks 305(2-3) may form packets from data sent by higher-level layers and pass these packets down to the PHY layer 340. Use of the protocol stacks 305(1-3) may enable the third wireless router 105(3), i.e., the BSR to be IP-protocol compatible.
With regard to
The common resource managing S/W 240 may distribute information associated with the first and second wireless connections and at least one wireline connection to each wireless router 105 and IP router 125 including the third wireless router 105(3) to commonly manage the one or more Internet Protocol based resources on a network layer having an associated Internet Protocol based strategy, as indicated in block 405. For example, the first wireless connection may be the first wireless link 122(1) or a wireless IP-Hop. A wireline connection may be the network link 127 or an IP-Hop. The transport of the plurality of packets may be analyzed during a specific service of the particular user across the first and second wireless connections and the at least one wireline connection, e.g., the network link 127 to forward the plurality of packets based on the Internet Protocol based strategy, at block 410.
According to one illustrative embodiment,
On the Internet 250, for example, a user-service metric may be related to the end-to-end QoS. For each user and each service a user-service metric may be used for each network link and each wireless link. One example of the first metric for the network link 127 is bandwidth. Examples of the second metric for the first wireless link 122 are throughput, delay or bit rate. A value or information may be associated with each wireless and network link for the corresponding metric. Such value or information of the metric may characterize the respective link for route discovery of the plurality of packets. The value or information of each metric may be distributed to all routers including the wireless routers 105(1-N) and the IP routers 125(1-3), in one embodiment. Based on this metric related distributed information, each router including the wireless routers 105(1-N) and the IP routers 125(1-3) may determine whether or not to forward a packet on an associated wireless link or a network link. By not differentiating between a wireless link and a network link, the wireless routers 105(1-N) and the IP routers 125(1-3) may enable routing of the plurality of packets through the converged network 110.
For such first and second user-service metrics, any number of suitable measurement methodologies may be used. A direct measurement, or a projection or an estimation of metric value may be obtained. Based on the direct measurement, a user-service metric value may be obtained using injected test traffic. For example, a measurement of a round-trip delay of an IP packet of a given size over a given route at a given time may indicate a value of the user-service metric.
In the projection approach, a metric value may be obtained form lower-level measurements, i.e., for given accurate measurements of propagation delay and bandwidth for each step along a path, projection of the complete delay for the path for an IP packet of a given size may be ascertained. The estimation of a metric value may be determined from a set of aggregated measurements of delay for a given one-hop path for IP packets of different sizes, e.g., estimation of propagation delay for the link of that one-hop path may be calculated.
At block 505, configuring the packet-based access network 100 may be configured to cause the Internet protocol-based QoS criteria to select the at least one first network link and the at least one first wireless link based on the first and second metrics. At block 510, the plurality of packets may be communicated over at least one first network link, i.e., the network link 127 between the first wireless router 105(1) and the first Internet protocol-based router 125(1) and at least one first wireless link, i.e., 122(1) to provide a desired end-to-end QoS in the specific service to the particular user. In this manner, the wireless router 105 and the IP router 125 may provide simultaneous access to a user across many access technologies on at least one wireless and at least network link in the converged network 110 of wired/fixed and wireless portions, with a relatively best quality for an end-to-end QoS.
Over the Internet 250, as two examples, QoS models including Integrated Services (IntServ) aided with Resource Reservation Protocol (RSVP) and Differentiated Services (DiffServ) may be deployed. While the IntServ model may guarantee the QoS in a manner of end-to-end fine granularity, the DiffServ model may replace the per-flow service with an aggregate-class, per hop service, while pushing the per-flow state management to edge routers.
The network configuration of the converged network 110 entails connecting the first, second and IP-routers 120(1-3) via wired links. Radio access is performed with the wireless routers 105(1-N) that connect to a user via corresponding wireless links. The network layer management provides a non-centralized management since it is IP-based and is therefore distributed across the first, second and IP-routers 120(1-3) and the first, second, third, fourth and Nth wireless routers 105(1-N).
In some embodiments, a link technology agnostic approach combined with the use of one or more user-and-service specific metrics may provide a resource management for heterogeneous and converged networks. For the resource management, a wireless link becomes an IP hop, enabling use of existing IP mechanisms. In other embodiments, a resource management at the network layer may provide relatively low-cost and less complex wireless routers. Thus, an IP-based resource management may result in a flat architecture for the routers.
Such a flexible approach to the resource management may allow extension of an existing or integration of a new communication interface technologies by adapting the metrics on the new radio access technology without impacting on overall system architecture and protocols as well resource management. A simultaneous access via different radio access technologies may be fully supported by leveraging a BSR as a wireless router. Therefore, in next generation networks, resource management may be based on one or more user-service-specific metrics, employing IP-based mechanisms. Some IP-based QoS mechanisms include queuing strategies and/or reservation, allocation, and policing techniques for packet-forwarding in IP routers for differentiating network traffic streams based on the QoS. More specifically, the IP-based QoS mechanisms for the differentiated services and integrated services may use queuing, reservation, allocation and policing QoS strategies to differentiate network traffic.
Referring to
Turning now to
Finally,
For the NGN 600, in some embodiments, these IP-based mechanisms include but are not limited to, packet-based transfer, separation of control functions among bearer capabilities, call/session, and application/service, and decoupling of service provision from network. Additionally, provision of open interfaces, support for a wide range of services, applications and mechanisms based on service building blocks (including real time/streaming/non-real time services and multi-media), broadband capabilities with end-to-end QoS and transparency, inter-working with legacy networks via open interfaces, generalized mobility, and unrestricted access by users to different service providers.
For example, in next generation of wireless cellular networks, radio resource management strategies may be used for IP-based QoS provisioning. Next generation wireless networks may offer applications with diverse bandwidth and quality of service requirements, a mixture of real-time and non-real-time, circuit- and packet-switched services, and devices with different transmission capabilities and frequency agility. Due to many challenges including the limited radio spectrum, high cost of radio access networks, volatile wireless channel conditions, and the diverse and demanding QoS requirements, supporting end-to-end IP communications and a provision of a universal platform for these applications and devices with reasonable cost, scalability and reliability may be feasible. By supporting heterogeneous traffic seamlessly over a radio access system, a system-wide resource management may be enabled for disparate wireless access techniques. Heterogeneous traffic may be supported seamlessly over a radio access system for disparate wireless access techniques. Such resource management may allow extension of an existing or integration of a new communication interface without impacting on overall system architecture and protocols.
Portions of the present invention and corresponding detailed description are presented in terms of software, or algorithms and symbolic representations of operations on data bits within a computer memory. These descriptions and representations are the ones by which those of ordinary skill in the art effectively convey the substance of their work to others of ordinary skill in the art. An algorithm, as the term is used here, and as it is used generally, is conceived to be a self-consistent sequence of steps leading to a desired result. The steps are those requiring physical manipulations of physical quantities. Usually, though not necessarily, these quantities take the form of optical, electrical, or magnetic signals capable of being stored, transferred, combined, compared, and otherwise manipulated. It has proven convenient at times, principally for reasons of common usage, to refer to these signals as bits, values, elements, symbols, characters, terms, numbers, or the like.
It should be borne in mind, however, that all of these and similar terms are to be associated with the appropriate physical quantities and are merely convenient labels applied to these quantities. Unless specifically stated otherwise, or as is apparent from the discussion, terms such as “processing” or “computing” or “calculating” or “determining” or “displaying” or the like, refer to the action and processes of a computer system, or similar electronic computing device, that manipulates and transforms data represented as physical, electronic quantities within the computer system's registers and memories into other data similarly represented as physical quantities within the computer system memories or registers or other such information storage, transmission or display devices.
Note also that the software implemented aspects of the invention are typically encoded on some form of program storage medium or implemented over some type of transmission medium. The program storage medium may be magnetic (e.g., a floppy disk or a hard drive) or optical (e.g., a compact disk read only memory, or “CD ROM”), and may be read only or random access. Similarly, the transmission medium may be twisted wire pairs, coaxial cable, optical fiber, or some other suitable transmission medium known to the art. The invention is not limited by these aspects of any given implementation.
The present invention set forth above is described with reference to the attached figures. Various structures, systems and devices are schematically depicted in the drawings for purposes of explanation only and so as to not obscure the present invention with details that are well known to those skilled in the art. Nevertheless, the attached drawings are included to describe and explain illustrative examples of the present invention. The words and phrases used herein should be understood and interpreted to have a meaning consistent with the understanding of those words and phrases by those skilled in the relevant art. No special definition of a term or phrase, i.e., a definition that is different from the ordinary and customary meaning as understood by those skilled in the art, is intended to be implied by consistent usage of the term or phrase herein. To the extent that a term or phrase is intended to have a special meaning, i.e., a meaning other than that understood by skilled artisans, such a special definition will be expressly set forth in the specification in a definitional manner that directly and unequivocally provides the special definition for the term or phrase.
While the invention has been illustrated herein as being useful in a telecommunications network environment, it also has application in other connected environments. For example, two or more of the devices described above may be coupled together via device-to-device connections, such as by hard cabling, radio frequency signals (e.g., 802.11(a), 802.11(b), 802.11(g), Bluetooth, or the like), infrared coupling, telephone lines and modems, or the like. The present invention may have application in any environment where two or more users are interconnected and capable of communicating with one another.
Those skilled in the art will appreciate that the various system layers, routines, or modules illustrated in the various embodiments herein may be executable control units. The control units may include a microprocessor, a microcontroller, a digital signal processor, a processor card (including one or more microprocessors or controllers), or other control or computing devices as well as executable instructions contained within one or more storage devices. The storage devices may include one or more machine-readable storage media for storing data and instructions. The storage media may include different forms of memory including semiconductor memory devices such as dynamic or static random access memories (DRAMs or SRAMs), erasable and programmable read-only memories (EPROMs), electrically erasable and programmable read-only memories (EEPROMs) and flash memories; magnetic disks such as fixed, floppy, removable disks; other magnetic media including tape; and optical media such as compact disks (CDs) or digital video disks (DVDs). Instructions that make up the various software layers, routines, or modules in the various systems may be stored in respective storage devices. The instructions, when executed by a respective control unit, causes the corresponding system to perform programmed acts.
The particular embodiments disclosed above are illustrative only, as the invention may be modified and practiced in different but equivalent manners apparent to those skilled in the art having the benefit of the teachings herein. Furthermore, no limitations are intended to the details of construction or design herein shown, other than as described in the claims below. It is therefore evident that the particular embodiments disclosed above may be altered or modified and all such variations are considered within the scope and spirit of the invention. Accordingly, the protection sought herein is as set forth in the claims below.
