TWI411276B - Session initiation protocol registration with ping - Google Patents

Abstract

Systems and methodologies are described that facilitate improving session initiation protocol based registration of a mobile device and an IP multimedia subsystem in wireless communications. The mobile device discovers one or more SIP servers (e.g., proxy call session control functions) that are available. The mobile device issues a ping message to each discovered server in parallel to determine reachability. Based at least in part on measured round trip times associated with the ping messages, the mobile device initiates registration procedures with at least one server.

Description

Call initial agreement registration with echo check

The following description relates generally to wireless communications and, more particularly, to improving call initial agreement registration by utilizing echo check messages to determine reachability.

The present application claims the benefit of U.S. Provisional Patent Application Serial No. 60/978,072, filed on Jan. 5, 2007, entitled <RTIgt;"METHOD AND APPARATUS FOR OPTIMIZING A REGISTRATION PROCEDURE" . The entire text of the above application is hereby incorporated by reference.

Wireless communication systems are widely deployed to provide various types of communication content such as voice, material, and the like. A typical wireless communication system can be a multiple access system capable of supporting communication with multiple users by sharing available system resources (eg, bandwidth, transmission power, ...). Examples of such multiple access systems may include a code division multiple access (CDMA) system, a time division multiple access (TDMA) system, a frequency division multiple access (FDMA) system, and orthogonal frequency division multiple access (OFDMA). Systems, and similar systems. Additionally, such systems may conform to specifications such as Third Generation Partnership Project (3GPP), 3GPP2, 3GPP Long Term Evolution (LTE), and the like.

In general, a wireless multiple access communication system can simultaneously support communication for multiple mobile devices. Each mobile device can communicate with one or more base stations via transmissions on the forward and reverse links. The forward link (or downlink) refers to the communication link from the base station to the mobile device, and the reverse link (or uplink) refers to the communication link from the mobile device to the base station. Additionally, communication between the mobile device and the base station can be established via a single input single output (SISO) system, a multiple input single output (MISO) system, a multiple input multiple output (MIMO) system, and the like. In addition, mobile devices can communicate with other mobile devices (and/or base stations and other base stations) in a point-to-point wireless network configuration.

Wireless communication systems are often used to provide one or more base stations. A typical base station can transmit multiple data streams for broadcast, multicast, and/or unicast services, where the data stream can be a stream of data that can be independently received for access to the terminal. An access terminal within the coverage area of the base station can be used to receive one, more than one, or all of the data streams carried by the composite stream. Similarly, the access terminal can transmit the data to the base station or another access terminal.

MIMO systems commonly employ multiple (N _T th) transmit antennas and multiple (N _R) receive antennas for data transmission. The MIMO channel formed by the N _T transmit antennas and N _R receive antennas may be decomposed into N _S independent channels, these channels may be referred to as spatial channels, wherein . Each of the N _S independent channels corresponds to a dimension. In addition, MIMO systems can provide improved performance (e.g., increased spectral efficiency, higher throughput, and/or greater reliability) if the additional dimensions generated by multiple transmit and receive antennas are utilized.

A simplified summary of one or more embodiments is presented below to provide a basic understanding of the embodiments. This Summary is not an extensive overview of the various embodiments, and is not intended to identify key or critical elements of the embodiments. The sole purpose is to present some concepts of the one or more embodiments

Various aspects are described in connection with the registration of an initial protocol based on a mobile device in an improved wireless communication and an IP multimedia subsystem in accordance with one or more embodiments and their corresponding disclosures. The mobile device discovers one or more SIP servers available (eg, proxy call control functions). The mobile device sends an echo check message to each of the discovered servers in parallel to determine reachability. The mobile device initiates a registration procedure to the at least one server based at least in part on the measured round trip time associated with the echo check message.

In accordance with the relevant aspects, a method for facilitating the registration of the initial agreement for improved calls is provided. The method can include discovering a plurality of proxy servers. The method can also include transmitting an echo check message to each of the discovered proxy servers, wherein the echo check message solicits a return response. Additionally, the method can include measuring a round trip time associated with each echo check message. Moreover, the method can also include initiating a registration procedure for at least one of the discovered proxy servers based on the measured round trip time.

Another aspect relates to a communication device that facilitates registration of a call initial agreement. The communication device can include means for discovering a plurality of proxy servers. The communication device can also include means for transmitting an echo check message to each of the discovered proxy servers, wherein the echo check message solicits a return response. Additionally, the communication device can include means for measuring the round trip time associated with each echo check message. Moreover, the communication device can also include means for initiating a registration procedure for at least one of the discovered proxy servers based on the measured round trip time.

Yet another aspect relates to a wireless communication device. The wireless communication device can include a memory that maintains instructions related to: discovering a plurality of proxy servers; transmitting an echo check message to each of the discovered proxy servers, wherein the echo check message solicits a return response; Measuring a round trip time associated with each echo check message; and initiating a registration procedure for at least one of the discovered proxy servers based on the measured round trip time. Moreover, the wireless communication device can further include a processor coupled to the memory, the processor configured to execute instructions retained in the memory.

Yet another aspect relates to a computer program product that can have a computer readable medium. The computer readable medium can include code for causing a computer to discover a plurality of proxy servers. The computer readable medium can also include a code for causing the computer to transmit an echo check message to each of the discovered proxy servers, wherein the echo check message seeks a return response. Additionally, the computer readable medium can also include code for causing the computer to measure the round trip time associated with each echo check message. Moreover, the computer readable medium can include a code for causing the computer to initiate a registration procedure to at least one of the discovered proxy servers based on the measured round trip time.

Another aspect relates to devices in a wireless communication system. The apparatus can include a processor configured to discover a plurality of proxy servers. The processor can also be configured to transmit an echo check message to each of the discovered proxy servers, wherein the echo check message solicits a return response. The processor can be further configured to measure the round trip time associated with each echo check message. Additionally, the processor can be configured to initiate a registration procedure to at least one of the discovered proxy servers based on the measured round trip time.

Another aspect described herein relates to a method of facilitating registration of a call initial agreement for a mobile device. The method can include receiving at least one echo check message from the mobile device. The method can also include transmitting the returned message to the mobile device in response to the at least one echo check message. Moreover, the method can also include initiating registration with the mobile device based at least in part on the round trip time required to transmit and receive the at least one echo check message and the return message.

Yet another aspect relates to a communication device that facilitates registration of a call initial agreement. The communication device can include means for receiving at least one echo check message from the mobile device. The communication device can also include means for transmitting the returned message to the mobile device in response to the at least one echo check message. Moreover, the communication device can include means for initiating registration with the mobile device based at least in part on the round trip time required to transmit and receive the at least one echo check message and the return message.

Another aspect described herein pertains to wireless communication devices that can include memory. The memory can maintain instructions relating to receiving at least one echo check message from the mobile device, transmitting the return message to the mobile device in response to the at least one echo check message, and based at least in part on transmitting and receiving the at least An echo check message and the round trip time required to return the message initiate registration with the mobile device. Additionally, the wireless communication device can also include a processor coupled to the memory, the processor configured to execute instructions retained in the memory.

Still another aspect relates to a computer program product having a computer readable medium, the computer readable medium comprising code for causing a computer to receive at least one echo check message from a mobile device. The computer readable medium can also include a code for causing the computer to send a return message to the mobile device in response to the at least one echo check message. Moreover, the computer readable medium can include code for causing the computer to initiate registration with the mobile device based at least in part on the round trip time required to transmit and receive the at least one echo check message and the return message.

Yet another aspect relates to devices in a wireless communication system. The apparatus can include a processor configured to receive at least one echo check message from the mobile device. The processor can also be configured to transmit the return message to the mobile device in response to the at least one echo check message. Additionally, the processor can be configured to initiate registration with the mobile device based at least in part on the round trip time required to transmit and receive the at least one echo check message and the return message.

In order to achieve the above and related ends, the one or more embodiments include the features fully described below and particularly pointed out in the claims. The detailed description of the one or more embodiments are set forth in the following description and drawings. These aspects are indicative, however, of but a few of the various embodiments of the various embodiments may

Various embodiments are described with reference to the drawings, in which like reference numerals are used to refer to the same. In the following description, numerous specific details are set forth However, it will be apparent that the embodiment can be practiced without such specific details. In other instances, well-known structures and devices are shown in block diagram form in order to facilitate describing one or more embodiments.

As used in this application, the terms "component", "module", "system" and the like are intended to mean a computer-related entity, or a combination of hardware, firmware, hardware and software, software or For the software in execution. For example, a component can be, but is not limited to being, a process executed on a processor, a processor, an object, an executable, a thread, a program, and/or a computer. By way of illustration, both an application and a computing device executing on a computing device can be a component. One or more components can reside within a process and/or thread and a component can be limited to a computer and/or distributed between two or more computers. In addition, such components can be executed from a variety of computer readable media stored with various data structures. The components can communicate, for example, via a local and/or remote process based on a signal having one or more data packets (eg, from one another via the signal to another component in the regional system, the distributed system) Interactive and/or information across components such as the Internet that interact with other systems).

Moreover, various embodiments are described herein in connection with a mobile device. Mobile devices may also be referred to as systems, subscriber units, subscriber stations, mobile stations, mobile units, remote stations, remote terminals, access terminals, user terminals, terminals, wireless communication devices, user agents. , user device or user equipment (UE). The mobile device can be a cellular phone, a wireless phone, a call initiation protocol (SIP) phone, a wireless area loop (WLL) station, a personal digital assistant (PDA), a wirelessly connected handheld device, a computing device, or a connection to wireless data. Other processing devices of the machine. Moreover, various embodiments are described herein in connection with a base station. The base station can be used to communicate with mobile devices and can also be referred to as an access point, a Node B, an evolved Node B (eNode B or eNB), a base transceiver station (BTS), or some other terminology.

Furthermore, the various aspects or features described herein can be implemented as a method, apparatus, or article of manufacture using standard stylized and/or engineering techniques. The term "article of manufacture" as used herein is intended to encompass a computer program accessible from any computer readable device, carrier, or media. By way of example, computer readable media can include, but is not limited to, magnetic storage devices (eg, hard disks, floppy disks, magnetic strips, etc.), optical disks (eg, compact compact discs (CD), digitally versatile compact discs (DVD) Etc.), smart cards and flash memory devices (eg, EPROM, cards, sticks, key drives, etc.). Additionally, various storage media described herein can represent one or more devices and/or other machine-readable media for storing information. The term "machine-readable medium" may include, but is not limited to, wireless channels and various other media capable of storing, containing, and/or carrying instructions and/or data.

The techniques described herein can be used in a variety of wireless communication systems, such as code division multiple access (CDMA), time division multiple access (TDMA), frequency division multiple access (FDMA), orthogonal frequency division multiple access (OFDMA). ), single carrier frequency domain multiplexing (SC-FDMA) and other systems. The terms "system" and "network" are often used interchangeably. A CDMA system may implement a radio technology such as Universal Terrestrial Radio Access (UTRA), CDMA2000, and the like. UTRA includes Broadband-CDMA (W-CDMA) and other variants of CDMA. CDMA2000 covers the IS-2000, IS-95 and IS-856 standards. A TDMA system can implement a radio technology such as the Global System for Mobile Communications (GSM). An OFDMA system may implement a radio technology such as Evolved UTRA (E-UTRA), Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, flash OFDM, and the like. UTRA and E-UTRA are part of the Universal Mobile Telecommunications System (UMTS). 3GPP Long Term Evolution (LTE) is an upcoming release of UMTS that uses E-UTRA, which employs OFDMA on the downlink and SC-FDMA on the uplink. UTRA, E-UTRA, UMTS, LTE and GSM are described in documents from an organization named "3rd Generation Partnership Project" (3GPP). CDMA2000 and UMB are described in documents from an organization named "3rd Generation Partnership Project 2" (3GPP2).

Referring now to Figure 1, a wireless communication system 100 is illustrated in accordance with various embodiments presented herein. System 100 includes a base station 102 that can include multiple antenna groups. For example, one antenna group can include antennas 104 and 106, another group can include antennas 108 and 110, and additional groups can include antennas 112 and 114. Two antennas are illustrated for each antenna group; however, more or fewer antennas may be utilized for each group. The base station 102 can additionally include a transmitter chain and a receiver chain, each of which can in turn include a plurality of components associated with signal transmission and reception (eg, a processor, a modulator, a multiplexer, Demodulation transformers, demultiplexers, antennas, etc., as will be appreciated by those skilled in the art.

Base station 102 can communicate with one or more mobile devices, such as mobile device 116 and mobile device 122; however, it should be appreciated that base station 102 can communicate with substantially any number of mobile devices similar to mobile devices 116 and 122. . Mobile devices 116 and 122 can be, for example, cellular phones, smart phones, laptops, handheld communication devices, handheld computing devices, satellite radios, global positioning systems, PDAs, and/or for use in wireless communication systems Any other suitable device for communication on the 100. As depicted, mobile device 116 is in communication with antennas 112 and 114, wherein antennas 112 and 114 transmit information to mobile device 116 on forward link 118 and receive information from mobile device 116 on reverse link 120. In addition, mobile device 1.22 is in communication with antennas 104 and 106, wherein antennas 104 and 106 transmit information to mobile device 122 on forward link 124 and receive information from mobile device 122 on reverse link 126. In a frequency division duplex (FDD) system, for example, the forward link 118 may utilize a frequency band different from the frequency band used by the reverse link 120, and the forward link 124 may be used differently than by the reverse link 126. The frequency band of the band used. Additionally, in a time division duplex (TDD) system, forward link 118 and reverse link 120 may utilize a common frequency band and forward link 124 and reverse link 126 may utilize a common frequency band.

The area in which each antenna group and/or antenna is designated to communicate may be referred to as a sector of base station 102. For example, an antenna group can be designed to pass to a mobile device in a sector of an area covered by base station 102. In communications on forward links 118 and 124, the transmit antennas of base station 102 may utilize beamforming to improve the signal to interference ratios for forward links 118 and 124 of mobile devices 116 and 122. This can be provided, for example, by using a precoder to manipulate the signal in the desired direction. Moreover, when the base station 102 utilizes beamforming transmission to the mobile devices 116 and 122 that are randomly dispersed throughout the associated coverage, the mobile devices in the adjacent cells are compared to the base stations transmitted to all of its mobile devices via a single antenna. Can withstand less interference. Moreover, in an example, mobile devices 116 and 122 can communicate directly with each other using point-to-point or special techniques. According to an example, system 100 can be a multiple input multiple output (MIMO) communication system. Additionally, system 100 can generally utilize any type of duplexing technique, such as FDD, TDD, and the like, to divide communication channels (eg, forward link, reverse link, ...).

Turning to Figure 2, a communication device 200 for use in a wireless communication environment is illustrated. Communication device 200 can be part of a base station or base station, a portion of a mobile device or mobile device, or substantially any communication device that receives data transmitted in a wireless communication environment. In a communication system, the communication device 200 can use the components described below to enable selection of a reachable Call Initiation Protocol (SIP) server prior to initiating the registration procedure.

The communication device 200 can include a SIP module 202 that uses a call initiation protocol (SIP) (e.g., a signaling protocol) to set up and/or disrupt a multimedia communication call. For example, SIP can be used to establish calls associated with applications such as, but not limited to, video conferencing, instant messaging, online gaming, streaming multimedia, and the like. In addition, SIP can be utilized to establish communication calls within an IP Multimedia Subsystem (IMS) to enable IP-based multimedia services in a wireless communication system.

According to an example, SIP module 202 can discover a SIP server that provides an interface between communication device 200 and an IMS (not shown), such as a Proxy Call Control Function (P-CSCF). For example, the SIP module 202 can discover the SIP server by obtaining a list of P-CSCF entries from a Dynamic Host Configuration Protocol (DHCP) server. The SIP module 202 does not guarantee that the discovered SIP server is reachable. The P-CSCF entry on the obtained list may temporarily lose contact with the communication device 200 or be no longer active (eg, old items that must still be cleared). In one aspect, SIP module 202 initiates a registration procedure to the P-CSCF entry to determine reachability. The registration process may require multiple attempts so that it takes about thirty seconds to determine reachability for each item in the list.

According to another aspect, the communication device 200 can further include an echo check module 204 that can facilitate the ascertainability of the SIP server (e.g., P-CSCF). The echo check module 204 can transmit an echo check message to each SIP server. In one aspect, the echo check module 204 transmits the echo check message to all proxy servers in parallel. The echo check message is a mechanism by which the availability of a particular server/entity in the network can be tested. The echo check message solicits a response from the target (eg, proxy server or P-CSCF) to cause the target to return a response upon receipt of the echo check message. A target that can be reached or available to return a response that is not reachable does not return a response. The echo check module 204 can measure the round trip time, which corresponds to the time required to send and receive a particular echo check message plus the time required to send and receive a response. In another example, the echo check module 204 can transmit a plurality of echo check messages to improve the reliability of the round trip time amount side. The echo check module 204 can aggregate all round trip time measurements and evaluate at least one of an average time, a minimum time, a maximum time, an intermediate time, and/or any other statistical measure that can be applied to the set of measurements.

The communication device 200 can also include a server selection module 206 that selects a server (e.g., a proxy server or a P-CSCF) from among the reachable servers. The reachable server includes the discovered server that sent a response to the echo check message transmitted by the echo check module 204. The server selection module 206 can select the server with the lowest measured round trip time. In addition, the server selection module 206 can select a server having a lowest average round trip time, a minimum round trip time, a maximum round trip time, or an intermediate round trip time based on a plurality of measurements. In addition, it should be appreciated that the server selection module 206 can select a server based on a combination of statistical metrics. For example, the server selection module 206 can select a server having the lowest average travel time and also coupled to the second server and having a lower intermediate time than the second server. After selection, the SIP module 202 can initiate registration procedures with the selected server.

According to another aspect, communication device 200 can be processed by SIP registration to a first responder (e.g., a first server, a proxy server, or a P-CSCF responsive to an echo check message). During this initial registration to the first responder, the communication device 200 can ignore other servers that respond later. The communication device 200 can maintain responses received from other servers. Therefore, if the initial registration fails, the communication device 200 can attempt to register with other servers (receiving their responses). For example, communication device 200 can use selection techniques such as the selection techniques described above. Additionally, the communication device 200 can attempt to register with a second server that responds immediately. The communication device 200 can repeat this process a number of times as necessary until a successful registration occurs.

Moreover, although not shown, it should be appreciated that the communication device 200 can include memory that maintains instructions for the discovery server, proxy server, and/or P-CSCF, transmitting echo check messages, and receiving echo check messages. In response, the round trip time is measured, and the server and the like are selected based on the round trip time measurement. In addition, the memory can maintain instructions for aggregating and statistically analyzing measurements from multiple echo check messages to improve reliability. Additionally, communication device 200 can include a processor that can be utilized in conjunction with executing instructions (e.g., instructions retained in memory, instructions obtained from an entirely heterogeneous source, ...).

Referring now to Figure 3, a wireless communication system 300 that facilitates determining the reachability of a proxy SIP server prior to initiating a registration procedure is illustrated. System 300 includes an access terminal 302 (e.g., mobile device, user device, mobile terminal, ...) that can communicate with base station 304 (and/or any number of disparate devices (not shown)). The base station 304 can transmit information to the access terminal 302 on the forward link channel or the downlink channel; in addition, the base station 304 can receive the access terminal from the reverse link channel or the uplink channel. 302 information. Additionally, system 300 can be a MIMO system. Additionally, system 300 can operate in an OFDMA wireless network such as 3GPP, 3GPP2, 3GPP LTE, and the like. Also, in an example, the components and functionality in the base station 304 shown and described below may be present in the access terminal 302, and the components and functionality in the access terminal 302 may reside in the base station. 304.

System 300 can further include an access network 306 that can perform the radio functionality of the wireless network and provide connectivity to a core network (not shown) that can interface with the public switched network or interface. Access network 306 can be a radio access network, a UMTS terrestrial radio access network, a LET network, an evolved data optimization (EV-DO) network, and the like. In addition, access network 306 can include one or more radio network controllers (not shown) that control the utilization and reliability of radio resources. System 300 can also include a packet data server node (PDSN) 308 that can establish, maintain, and terminate point-to-point (PPP) calls associated with mobile devices such as access terminal 302. It should be appreciated that PDSN 308 can be a GPRS support node in a GSM or UMTS network or any other support node that manages PPP connections for a particular network. In addition, system 300 can include one or more P-CSCF servers 310 that enable access to the SIP registry of terminal 302 and facilitate access to terminal 302 and IMS (not shown). The connection between the shows).

According to one illustration, the access terminal 302 can communicate with the base station 304 via an air or radio connection. The base station 304 includes an A8/A9 controller 312 that can establish an A8 and/or A9 interface between the base station 304 and the access network 306. In particular, the A8 interface carries user data between the base station 304 and the packet control function (not shown) of the access network 306. The A9 interface carries control or signaling information between the base station 304 and the access network 306. Access network 306, in turn, can include an A10/A11 controller 314 that facilitates establishing and utilizing the A10 and/or A11 interface between access network 306 and PDSN 308. Similar to the A8 and A9 interfaces, the A10 and A11 interfaces can carry user data and signaling information between the access network 306 and the PDSN 308, respectively.

According to an example, the access terminal 302 can include a SIP application 316 that requires an IP connection (e.g., a multimedia communication call) to a multimedia service provided by the IMS. For example, the SIP application 316 can be a voice IP application, a multimedia streaming application, or any other multimedia-based application that requires IMS. Access terminal 302 includes a SIP module 318 that facilitates the establishment of a multimedia communication call that can be used by SIP application 316. The SIP module 318 can include a discovery module 320 that obtains a list of proxy servers (e.g., P-CSCF server 310) that provide an interface between the access terminal 302 and the IP Multimedia subsystem. The discovery module 320 can obtain a list of entries for each P-CSCF 310 from the DHCP server. According to one aspect, the P-CSCF 310 can register with the DHCP server upon startup to enable the DHCP server to establish an entry for the P-CSCF 310 on the list of available servers. In order to obtain the list, the access terminal 302 can send a message to the base station 304 over the air. The base station 304 can forward the request to the access network 306 via the A8 or A9 interface. The access network 306 can request the PDSN 308 to establish a PPP connection for accessing the terminal 302 via the A10 or A11 interface. Thereafter, the access terminal 302 can access the server or other components using an IP-based protocol.

An echo check module 322 is provided that transmits an echo check message to each of the proxy servers in the list obtained by the discovery module 320 to determine which of the servers in the list are reachable. According to one aspect, the echo check module 322 can send echo check messages to all servers in parallel. The echo check module 322 can include a round trip evaluator 324 that measures the round trip time based on the timestamp of the transmission of the echo check message and the timestamp associated with the return response. The server selection module 326 can select a proxy server from a set of reachable servers. The reachable server is the server that returns a response to the echo check message. In accordance with an aspect, the server selection module 326 can select a proxy server having a minimum round trip time as determined by the round trip evaluator 324. After selection, SIP module 318 can initiate SIP registration with the selected proxy server to enable establishment of a multimedia communication call for SIP application 316. In addition, the server selection module 326 can rank all reachable servers based on the measured round trip time and in turn initiate registration with each of the aligned servers until a multimedia call is established.

4 illustrates an example call flow 400 depicting a proxy server (e.g., P-CSCF) and registration with a proxy server (e.g., P-CSCF) in accordance with aspects of the present disclosure. The call flow 400 includes an access terminal (AT), an access network (AN), and a packet data server (PDSN). The call flow 400 is described within the context of the Voice over Internet Protocol (VoIP) feature in the 1xEV-DO Rev. A system. However, it should be appreciated that the process depicted in call flow 400 can be adapted to other features and/or other systems.

According to an example, SIP subscriptions can be made according to the following. Start SIP and VoIPQoS applications. Based on interaction with the lower layers of the AT, the SIP/VoIP application knows whether the currently associated AN supports VoIP. In addition, if an AN is configured with an MP by MPA and/or EMPA, the AN is considered to be aware of QoS. If the AN does not support VoIP, the AT bypasses the remainder of the call flow 400 and registers with the circuit switched network. VoIP applications configure real-time protocol (RTP) QoS. Once the RTP configuration is complete, the VoIP application triggers the SIP application to perform IMS registration. The SIP application obtains the address of the P-CSCF (eg, SIP server) and configures and/or initiates QoS for the SIP stream. When the SIP QoS is configured and started, the AT continues to register with the IMS. If the SIP application times out and does not receive a response, the SIP application attempts to reach the alternate P-CSCF. Once the IMS is successful, the address of the P-CSCF can be changed in the SIP QoS configuration if necessary. SIP subscriptions are kept open.

Returning to call flow 400, an alternative method is described. Initially, at 401, the AT was first turned on. At 402, the AT performs a call negotiation. The AN provides a list of Quality of Service (QoS) profiles that the AN can process as part of the parameter negotiation for Multi-Stream Packet Application (MPA)/Enhanced Multi-Stream Packet Application (EMPA). Additionally, 402 can include access authentication (eg, authentication of an access terminal).

At 403, if the PPP call has not been established, the SIP application triggers the initiation of the PPP call. At 404, the VoIP application requests configuration of an RTP stream for the first call. The AN configures the radio protocol by the appropriate parameters required to carry the RTP stream. At 405, the AN performs an A11 signaling to establish an A10 interface connection. At 406, a configuration traffic flow template (TFT) filter and channel processing information is communicated via the RSVP message at the PDSN. After 406, the RTP flow is successfully configured and the subscription remains in the off state. Notify the VoIP application of a successful RTP QoS flow configuration.

At 407, the SIP application determines a list of P-CSCF (e.g., SIP server) addresses. At 408, the SIP application requests configuration of a SIP QoS flow. The AT negotiates with the AN to configure the radio protocol required to carry the SIP stream. In addition, the PDSN is also configured by the necessary TFT filters. At 409, an A10 connection is established between the AN and the PDSN. At 410, the AT performs RSVP messaging to set up a filter at the PDSN. Configure the TFT filter and channel processing information at the PDSN. The filter used for the SIP stream is the source address of the P-CSCF and the destination address of the AT. The P-CSCP address utilized is the address from the list of P-CSCF addresses.

At 411, after successfully configuring the radio QoS flow and the PDSN filter, the AT requests the AN to turn the subscription to the on state. At 412, the AN informs the PDSN that the SIP QoS flow is initiated. According to an example, the QoS for the RTP stream can be configured/prepared (CONFIGURED/READY) and the QoS for the SIP stream is configured/prepared/authorized (CONFIGURED/READY/GRANTED). According to one illustration, CONFIGURED implies that the appropriate network request QoS has been provided to provide the required QoS metrics. Ready indicates that the network has responded and is providing the QoS configuration to the AT. The QoS configuration may include parameters that are specified for different protocol layers (eg, RLP, MAC, etc.). Authorized (GRANTED) implies that the QoS flow has been connected to the resources required for the QoS flow operation assigned to the AT.

At 413, the application requests execution of an echo check message to a point identified in the P-CSCF list (eg, a SIP server). During the P-CSCF discovery, the AT can obtain multiple addresses without knowing which of the list is reachable. In addition, the AT can only access a subset of the P-CSCF entries in the list. The echo check message makes it possible to avoid unnecessary delays caused by the application due to direct attempts to discover reachability via the IMS registration procedure as described above. The echo check message improves the performance of the AT in a fast association with the correct P-CSCF (e.g., an application registration attempt may take approximately thirty seconds before determining reachability) to enable rapid utilization of the service. According to one aspect, echo check messages to all P-CSCF entries can be performed in parallel. In addition, the AT can discover the nearest P-CSCF based on the measured round trip time. Echo check messages can also be sent multiple times to increase the reliability of the measurement and provide the application with minimum round trip time, average round trip time, and/or maximum round trip time. The round trip time measurement procedure helps optimize the delays encountered in SIP signaling and provides immediate impact in establishing SIP calls. The application can be notified of the P-CSCF items that are reachable in the list and the associated round trip time. The application can perform the registration process to the reachable P-CSCF entry from the item with the minimum round trip time. If the user initiates a call during this process, the AT can switch to the 1x system and the AT can perform this process again at the end of the call. The Echo Check Message Enable Service can be quickly returned to data optimization.

At 414, if the QoS configuration for the SIP flow is successful, the IMS registration begins. It should be appreciated that if SMS is supported on 1xEV-DO, IMS registration can occur on the preset stream. The AT selects the address in the P-CSCF list determined during the discovery process. If the IMS registration expires, an attempt is made to IMS registration with other P-CSCF entries from the list. The AT starts the timer to wait for a response from the P-CSCF. The AT may encounter problems in the case of IMS registration. For example, it may only allow the AT to register with a particular P-CSCF entry. If the registration to the initially selected server fails, the AT can still retry the registration in the other reachable P-CSCF.

If the IMS registration for the selected P-CSCF fails at 414, then steps 415 and 416 occur. At 415, the AT selects another entry from the P-CSCF list and repeats steps 413 and 414. At 416, the TFT filter needs to be changed to support the new P-CSCF address (e.g., the address to which the P-CSCF is ultimately connected). The AT QoS modification procedure performs a change in the filter settings while maintaining the initial QoS configuration for the radio portion.

It is understood that the specific order or hierarchy of steps in the process disclosed is an example of an exemplary method. It will be appreciated that the specific order or hierarchy of steps in the processes may be re-configured based on design preferences while remaining within the scope of the present disclosure. The accompanying method claims claim the elements of the various steps in the sample order and are not intended to be limited to the particular order or

Referring to Figures 5-6, a method for determining the reachability of a P-CSCF using an echo check message prior to starting the registration procedure is illustrated. Although the method is shown and described as a series of acts for the purpose of simplicity of the description, it is understood and appreciated that some acts may occur in an order different from the order shown and described herein in accordance with one or more embodiments. And/or coincide with other actions, so the method is not limited by the order of actions. For example, those skilled in the art will understand and appreciate that a method can alternatively be represented, for example, in a state diagram as a series of related states or events. In addition, not all illustrated acts may be required to implement a method in accordance with one or more embodiments.

Turning to FIG. 5, a method 500 of facilitating selection of a reachable server prior to initiating an IMS registration procedure using a call initiation protocol is illustrated. In an example, method 500 can be used by a mobile device to establish a multimedia communication call with an IMS to enable a multimedia service. At reference numeral 502, a plurality of Proxy Call Control Functions (P-CSCF) are found. The P-CSCF can be a SIP server. At reference numeral 504, an echo check is performed on each P-CSCF server (e.g., an echo check message is transmitted to the server) to determine reachability. The echo check message seeks a return response to cause the reachable server to send a response to the echo check message. At reference numeral 506, the round trip time associated with the echo check message for which the response was received is measured. At reference numeral 508, a registration procedure is initiated to at least one reachable P-CSCF. According to one illustration, the registration procedure can be initiated to the reachable P-CSCF associated with the fastest measured round trip time.

Referring now to Figure 6, a method 600 of facilitating selection of a reachable server prior to initiating an IMS registration procedure using a call initiation protocol is illustrated. In an example, method 600 can be used by a mobile device to establish a multimedia communication call with an IMS to enable a multimedia service. At reference numeral 602, a list including a plurality of P-CSCF entries is obtained. At reference numeral 604, each P-CSCF transmits an echo check message in parallel. At reference numeral 606, the round trip time associated with the received echo check message response is measured. At reference numeral 608, a determination is made as to whether sufficient measurements have been collected. For example, the setting may indicate that N measurements are made, where N is an integer greater than or equal to one. If additional measurements are required, method 600 returns to reference numeral 604 to issue another round of echo check messages and obtain an additional amount of time side. If sufficient measurements have been collected, method 600 continues to reference numeral 610 where the collected round trip time is gathered at reference numeral 610. For example, the collected measurements can be averaged. In addition, a minimum, maximum, intermediate, or any other statistical measure can be evaluated based on the collected measurements.

At reference numeral 612, the registration procedure is initiated to the best reachable P-CSCF. The reachable P-CSCF is a P-CSCF that returns a response to the echo check message. For example, the best P-CSCF may be the P-CSCF with the lowest aggregate round trip time. At reference numeral 614, a determination is made as to whether the registration was successful. If so, the method 600 ends. If not, the method 600 continues to reference numeral 616 where, at reference numeral 616, registration begins with a subsequently reachable server, if any. If no reachable server is available, the call setup fails. Method 600 can be iterated via reference numerals 614 and 616 until registration is successful.

It should be appreciated that, in accordance with one or more aspects described herein, inferences can be made regarding selecting a round trip time associated with an echo check message, selecting a SIP server for initial registration, determining reachability, and the like. . As used herein, the term "inference" or "inference" generally refers to a process of reasoning or inferring the state of a system, environment, and/or user based on a set of observations, such as via events and/or data capture. For example, inference can be used to identify a particular context or action, or can generate a probability distribution over the state. The inference can be probabilistic - that is, based on consideration of data and events, the probability distribution over the state of interest is calculated. Inference can also refer to techniques used to form higher level events based on a set of events and/or data. Regardless of whether the events are closely related in time, and regardless of whether the events and information are from an event and source of information or a number of events and sources of information, the inference constructs a new event based on a set of observed events and/or stored event data. Or action.

7 is an illustration of a mobile device 700 that facilitates communication associated with a mobile device in a wireless communication system in accordance with aspects of the disclosed invention. It should be appreciated that mobile device 700 can be the same or similar to mobile device 116, 200 or 302, such as described herein with respect to system 100, system 200, system 300, method 500, and method 600, and/or can include The mobile device 116, 200 or 302 has the same or similar functionality.

The mobile device 700 can include a receiver 702 that receives signals from, for example, a receiving antenna (not shown) and performs typical actions (eg, filtering, amplifying, downconverting, etc.) on the received signals and digitizing The modulated signal is obtained to obtain a sample. Receiver 702 can be, for example, an MMSE receiver, and can include a demodulation transformer 704 that can demodulate the received symbols and provide them to processor 706 for channel estimation. Processor 706 can be a processor dedicated to analyzing information received by receiver 702 and/or generating information for transmission by transmitter 708, a processor that controls one or more components of mobile device 700, and/or both A processor that analyzes the information received by the receiver 702, generates information for transmission by the transmitter 708, and controls one or more components of the mobile device 700. The mobile device 700 can also include a modulator 710 that can cooperate with the transmitter 708 to facilitate transmitting signals (eg, data) to, for example, a base station (eg, 102), another mobile device (eg, For example, 122) and so on.

In one aspect, the processor 706 can be coupled to a SIP application 316 that requires an IP connection (e.g., a multimedia communication call) to a multimedia service provided by the IMS. In another aspect, the processor 706 can be coupled to the SIP module 318, which facilitates the establishment of a multimedia communication call that can be used by the SIP application 316. The SIP module 318 can obtain a list of proxy servers (e.g., P-CSCF servers) that provide an interface between the mobile device 700 and the IP Multimedia Subsystem. The processor 706 can also be coupled to the echo check module 322. The echo check module 322 transmits the echo check message to each proxy server in the list obtained by the SIP module 318 to determine which servers in the list are reachable. . The echo check module 322 can measure the round trip time based on the timestamp of the transmission of the echo check message and the timestamp associated with the return response. In another aspect, the processor 706 can be further coupled to the server selection module 326, and the server selection module 326 can select a proxy server from a set of reachable servers. After selection, SIP module 318 can initiate SIP registration with the selected proxy server to enable establishment of a multimedia communication call for SIP application 316.

The mobile device 700 can further include a memory 712 operatively coupled to the processor 706 and configured to store data to be transmitted, received data, information related to available channels, and analyzed signals and/or interference. Intensity-associated information, information about assigned channels, power, rates, or the like, and any other suitable information used to estimate the channel and communicate via the channel. Memory 712 can additionally store protocols and/or algorithms associated with estimating and/or utilizing channels (e.g., based on performance, capacity based, etc.).

It should be appreciated that the data store (eg, memory 712) described herein can be a volatile memory or a non-volatile memory, or can include both volatile and non-volatile memory. By way of illustration and not limitation, non-volatile memory may include read only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable PROM (EEPROM), or flash memory. body. Volatile memory can include random access memory (RAM) that acts as external cache memory. By way of illustration and not limitation, RAM can be used in many forms, such as synchronous RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), dual data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchronization. Link DRAM (SLDRAM) and direct Rambus RAM (DRRAM). The memory 712 of the system and method of the present invention is intended to comprise, without being limited to, such and any other suitable type of memory.

It should be appreciated and understood that SIP application 316, SIP module 318, echo check message 322, and/or server selection module 326 can each be the same as the respective components of components such as those described herein more fully with respect to system 300. Or similar, and/or may include the same or similar functionality as the individual components of components such as those described herein more fully with respect to system 300. It should be further understood and understood that, as needed, the SIP application 316, the SIP module 318, the echo check module 322, the server selection module 326, and the memory 712 can each be a separate unit (as depicted), which can be included in Within processor 706, may be incorporated into another component, and/or in virtually any suitable combination thereof.

8 is an illustration of a system 800 that facilitates communication associated with a mobile device in a wireless communication system in accordance with aspects of the disclosed invention. System 800 includes a base station 802 (e.g., an access point, ...) having a receiver 810 that receives signals from one or more mobile devices 804 via a plurality of receive antennas 806, and transmits to the one or via transmit antenna 808 A transmitter 820 of the plurality of mobile devices 804. Receiver 810 can receive information from receive antenna 806 and is associated with demodulation 812 operation of the information received by the demodulation transformer. The demodulated symbols are analyzed by a processor 814, which may be a processor dedicated to analyzing information received by the receiver 810, generating information for transmission by the transmitter 820, controlling one of the base stations 802 or A processor of the plurality of components, and/or a processor that simultaneously analyzes the information received by the receiver 810, generates information for transmission by the transmitter 820, and controls one or more components of the base station 802. Moreover, processor 814 can be similar to the processor described above with respect to FIG. 7, and coupled to memory 816, which stores information related to estimated signal (eg, pilot) strength and/or interference strength. Information, information to be transmitted to mobile device 804 (or disparate base station (not shown)) or received from mobile device 804 (or disparate base station (not shown), and/or with the implementation of this document Any other suitable information about the various actions and functions.

In addition, the memory 816 can store data to be transmitted, information received, information related to available channels, data associated with the analyzed signal and/or interference strength, and assigned channel, power, rate, or Information about the analogue, and any other suitable information used to estimate the channel and pass it through the channel. Memory 816 can additionally store protocols and/or algorithms associated with estimating and/or utilizing channels (e.g., based on performance, capacity based, etc.). Base station 802 can also include a modulator 818 that can cooperate with transmitter 820 to facilitate the transmission of signals (e.g., data) to, for example, mobile device 804, another device, and the like. Moreover, although depicted as being separate from processor 814, it should be appreciated that demodulator 812 and/or modulator 818 can be part of processor 814 or a plurality of processors (not shown).

It should be appreciated that the memory 816 described herein can be a volatile memory or a non-volatile memory, or can include both volatile and non-volatile memory. By way of illustration and not limitation, non-volatile memory may include read only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable PROM (EEPROM), or flash memory. body. Volatile memory can include random access memory (RAM) that acts as external cache memory. By way of illustration and not limitation, RAM can be used in many forms, such as synchronous RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), dual data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchronization. Link DRAM (SLDRAM) and direct Rambus RAM (DRRAM). The memory 816 of the system and method of the present invention is intended to comprise, without being limited to, such and any other suitable type of memory.

FIG. 9 shows an example wireless communication system 900. For the sake of brevity, wireless communication system 900 depicts a base station 910 and a mobile device 950. However, it should be appreciated that system 900 can include more than one base station and/or more than one mobile device, wherein the additional base stations and/or mobile devices can be substantially similar or different than the example base station 910 and mobile device 950 described below. . In addition, it should be appreciated that base station 910 and/or mobile device 950 can utilize the systems described herein (FIGS. 1 - 3 and 7 - 8), call flows (FIG. 4), and/or methods (FIG. 5 - FIG. 6) to facilitate wireless communication between the base station 910 and the mobile device 950.

At base station 910, traffic data for a plurality of data streams is provided from data source 912 to a transmission (TX) data processor 914. According to an example, each data stream can be transmitted on a separate antenna. TX data processor 914 formats, codes, and interleaves the traffic data stream based on a particular encoding mechanism selected for the traffic data stream to provide encoded data.

The Orthogonal Frequency Division Multiplexing (OFDM) technique can be used to multiplex the encoded data and pilot data for each data stream. Additionally or alternatively, pilot symbols can be divided into frequency division multiplexing (FDM), time division multiplexing (TDM), or code division multiplexing (CDM). The pilot data is typically a known data pattern that is processed in a known manner and can be used at mobile device 950 to estimate channel response. Can be based on a particular modulation mechanism selected for each data stream (eg, Binary Phase Shift Keying (BPSK), Quadrature Phase Shift Keying (QPSK), M Phase Shift Keying (M-PSK), M Quadrature Amplitude Modulation (M-QAM), etc., is used to modulate (eg, symbol map) the multiplexed pilot and encoded data for the data stream to provide modulation symbols. The data rate, encoding, and modulation for each data stream can be determined by instructions executed or provided by processor 930.

The modulation symbols for the data stream may be provided to a TX MIMO processor 920, which may further process the modulated symbols (eg, for OFDM). TX MIMO processor 920 then provides N _T modulation symbol streams to provide variants to the number N _T transmitters (TMTR) 922a through 922t. In various embodiments, TX MIMO processor 920 applies beamforming weights to the symbols of the data stream and to the antenna from which the symbols are transmitted.

Each transmitter 922 receives and processes a respective symbol stream to provide one or more analog signals, and further conditions (e.g., amplifies, filters, and upconverts) the analog signals to provide a suitable transmission on the MIMO channel. The signal of modulation. Further, since each N _T antennas 922a through 922t number of warp N _T modulated signals from the transmitters 924a through 924t transmission.

In mobile device 950, the modulated signal of the transmitted received by N _R antennas 952a through 952r and the respective provided to a receiver (RCVR) 954a through 954r 952 from the received signal of each antenna. Each receiver 954 conditions (eg, filters, amplifies, and downconverts) the respective signals, digitizes the conditioned signals to provide samples, and further processes the samples to provide a corresponding "received" symbol stream.

RX data processor 960 may receive 954 the number N _R received symbol streams from the N _R receivers and based on a particular receiver processing technique to process these symbol streams to provide N _T a "of the detected" symbol streams. The RX data processor 960 can demodulate, deinterlace, and decode each detected symbol stream to recover the traffic data for the data stream. The processing by RX data processor 960 is complementary to the processing performed by TX MIMO processor 920 and TX data processor 914 at base station 910.

As described above, the processor 970 can periodically determine which precoding matrix to utilize. Additionally, processor 970 can formulate a reverse link message comprising a matrix index portion and a rank value portion.

The reverse link message may contain various types of information about the communication link and/or the received data stream. The reverse link message can be processed by the TX data processor 938 (which also receives the traffic data from the data source 936 for many data streams), modulated by the modulator 980, and adjusted by the transmitters 954a through 954r. And transmitted back to the base station 910.

At base station 910, the modulated signal from mobile device 950 is received by antenna 924, adjusted by receiver 922, demodulated by demodulation transformer 940, and processed by RX data processor 942. The reverse link message transmitted by the mobile device 950 is retrieved. Additionally, processor 930 can process the retrieved message to determine which precoding matrix to use for determining beamforming weights.

Processors 930 and 970 can direct (e.g., control, coordinate, manage, etc.) operation at base station 910 and mobile device 950, respectively. Individual processors 930 and 970 can be associated with memory 932 and 972 that store code and data. Processors 930 and 970 can also perform computations to derive frequency and impulse response estimates for the uplink and downlink, respectively.

It should be understood that the embodiments described herein can be implemented in hardware, software, firmware, intermediate software, microcode, or any combination thereof. For hardware embodiments, the processing unit can be implemented in one or more special application integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs). A field programmable gate array (FPGA), processor, controller, microcontroller, microprocessor, other electronic unit designed to perform the functions described herein, or a combination thereof.

When an embodiment is implemented in a software, firmware, intermediate software or microcode, code or code segment, it can be stored in a machine readable medium such as a storage component. A code segment can represent a program, a function, a subroutine, a program, a routine, a subroutine, a module, a package, a class, or any combination of instructions, data structures, or program descriptions. A code segment can be coupled to another code segment or a hardware circuit by transmitting and/or receiving information, data, arguments, parameters, or memory contents. Information, arguments, parameters, data, etc. may be transmitted, transmitted or transmitted in any suitable manner, including memory sharing, messaging, token transfer, network transmission, and the like.

For software embodiments, the techniques described herein can be implemented with modules (eg, procedures, functions, etc.) that perform the functions described herein. The software code can be stored in the memory unit and executed by the processor. The memory unit can be implemented within the processor or external to the processor, in which case the memory unit can be communicatively coupled to the processor via various means known in the art.

Referring to Figure 10, a system 1000 for determining the reachability of a P-CSCF via an echo check message during SIP registration is illustrated. For example, system 1000 can reside at least partially within a base station, mobile device, or the like. It should be appreciated that system 1000 is represented as including functional blocks that can be functional blocks representing functions implemented by a processor, software, or combination thereof (eg, firmware). System 1000 includes an electrical component logical grouping 1002 that can act in conjunction. For example, logical grouping 1002 can include an electrical component 1004 for discovering a plurality of proxy servers. Additionally, logical grouping 1002 can include an electrical component 1006 for transmitting an echo check message to each of the discovered proxy servers. In addition, logical grouping 1002 can include an electrical component 1008 for measuring the round trip time associated with each echo check message. Additionally, logical grouping 1002 can include an electrical component 1010 for initiating a registration procedure to at least one discovered proxy server. Additionally, system 1000 can include a memory 1012 that retains instructions for performing functions associated with electrical components 1004, 1006, 1008, and 1010. Although shown external to memory 1012, it should be understood that one or more of electrical components 1004, 1006, 1008, and 1010 may be present within memory 1012.

Figure 11 illustrates a system 1100 for determining registration for facilitating initial call agreement. For example, system 1100 can reside at least partially within a base station, mobile device, or the like. It should be appreciated that system 1100 is represented as including functional blocks that can be functional blocks that represent functions implemented by a processor, software, or combination thereof (eg, firmware). System 1100 includes an electrical component logic grouping 1102 that can act in conjunction. For example, logical grouping 1102 can include an electrical component 1104 for receiving at least one echo check message from a mobile device. Additionally, logical grouping 1102 can include an electrical component 1106 for transmitting a return message to the mobile device in response to the at least one echo check message. In addition, logical grouping 1102 can include an electrical component 1108 for initiating registration with a mobile device. For example, registering with the mobile device can be based, at least in part, on the round trip time required to transmit and receive the at least one echo check message and return the message. Additionally, system 1100 can include a memory 1110 that retains instructions for performing functions associated with electrical components 1104, 1106, and 1108. Although shown external to memory 1110, it should be understood that one or more of electrical components 1104, 1106, and 1108 may be present within memory 1110.

What has been described above includes examples of one or more embodiments. Of course, it is not possible to describe every possible combination of components or methods for the purpose of describing the above-described embodiments, but those skilled in the art will recognize that many other combinations and permutations of various embodiments are possible. Accordingly, the described embodiments are intended to embrace all such changes, modifications and variations in the scope of the invention. Moreover, to the extent that the term "comprises" is used in the context of the application or the scope of the application, the term is intended to be interpreted in a manner similar to the term "comprising" when "contained" is used as a transitional word in the scope of the patent application. And for inclusion.

100. . . Wireless communication system

102. . . Base station

104. . . antenna

106. . . antenna

108. . . antenna

110. . . antenna

112. . . antenna

114. . . antenna

116. . . Mobile device

118. . . Forward link

120. . . Reverse link

122. . . Mobile device

124. . . Forward link

126. . . Reverse link

200. . . Communication device/system

202. . . Call Initial Protocol (SIP) Module

204. . . Echo check module

206. . . Server selection module

300. . . Wireless communication system

302. . . Access terminal

304. . . Base station

306. . . Access network

308. . . Packet data servo node (PDSN)

310. . . P-CSCF server

312. . . A8/A9 controller

314. . . A10/A11 controller

316. . . SIP application

318. . . SIP module

320. . . Discovery module

322. . . Echo check module

324. . . Round trip evaluator

326. . . Server selection module

400. . . Call flow

700. . . Mobile device

702. . . receiver

704. . . Demodulation transformer

706. . . processor

708. . . Transmitter

710. . . Modulator

712. . . Memory

800. . . system

802. . . Base station

804. . . Mobile device

806. . . Receive antenna

808. . . Transmission antenna

810. . . receiver

812. . . Demodulation transformer

814. . . processor

816. . . Memory

818. . . Modulator

820. . . Transmitter

900. . . Wireless communication system

910. . . Base station

912. . . Data source

914. . . Transmission (TX) data processor

920. . . TX MIMO processor

922. . . Transmitter (TMTR) / Receiver (RCVR)

922a to 922t. . . Transmitter (TMTR) / Receiver (RCVR)

924a to 924t. . . antenna

930. . . processor

932. . . Memory

936. . . Data source

938. . . TX data processor

940. . . Demodulation transformer

942. . . RX data processor

950. . . Mobile device

952a to 952r. . . antenna

954. . . Receiver (RCVR) / Transmitter (TMTR)

954a to 954r. . . Receiver (RCVR) / Transmitter (TMTR)

960. . . RX data processor

970. . . processor

972. . . Memory

980. . . Modulator

1000. . . system

1002. . . Logical grouping of electrical components

1004. . . Electrical component for discovering a plurality of proxy servers

1006. . . Electrical component for transmitting echo check messages to each discovered proxy server

1008. . . Electrical component for measuring the round trip time associated with each echo check message

1010. . . Electrical component for initiating a registration procedure to at least one discovered proxy server

1012. . . Memory

1100. . . system

1102. . . Logical grouping of electrical components

1104. . . Electrical component for receiving at least one echo check message from the mobile device

1106. . . An electrical component for transmitting a return message to the mobile device in response to the at least one echo check message

1108. . . Electrical component for initiating registration of a mobile device

1110. . . Memory

1 is an illustration of a wireless communication system in accordance with various aspects set forth herein.

2 is an illustration of an example communication device for use within a wireless communication environment.

3 is an illustration of an example wireless communication system that facilitates determining the reachability of a proxy SIP server prior to initiating a registration procedure.

4 is an illustration depicting a call flow selected by a proxy server and registered with a proxy server in accordance with aspects of the present disclosure.

5 is an illustration of an example method that facilitates selecting an reachable server prior to initiating an IMS registration procedure using a call initiation protocol.

6 is an illustration of an example method that facilitates selecting an reachable server prior to initiating an IMS registration procedure using a call initiation protocol.

7 is an illustration of an example system that facilitates communication associated with a mobile device in a wireless communication system in accordance with aspects of the disclosed invention.

8 is an illustration of an example system that facilitates communication associated with a mobile device in a wireless communication system in accordance with aspects of the disclosed invention.

9 is an illustration of an example wireless network environment that can be used in conjunction with the various systems and methods described herein.

10 is an illustration of an example system for determining the reachability of a P-CSCF via an echo check message during SIP registration.

Figure 11 is an illustration of an example system that facilitates the registration of a call initial agreement.

Claims (36)

A method for registration of a call initial protocol performed by a mobile device, comprising: discovering a plurality of proxy servers; transmitting an echo check message from the mobile device to each of the discovered proxy servers, wherein the echo Checking the message request for a return response; measuring a round trip time associated with each round trip response received in response to the transmitted echo check message; and based on the measured round trip time A registration procedure that begins with at least one of the discovered proxy servers. The method of claim 1, wherein the finding of the plurality of proxy servers comprises obtaining a list comprising the plurality of proxy servers. The method of claim 1, wherein the transmission of the echo check messages to each of the discovered proxy servers occurs in parallel. The method of claim 1, further comprising issuing an echo check message multiple times to collect a plurality of measurements for each of the discovered proxy servers. The method of claim 4, further comprising determining an average round trip time, a minimum round trip time, a maximum round trip time, or an intermediate round trip time based on the plurality of measurements for each of the discovered proxy servers At least one of them. The method of claim 1, further comprising detecting a return response associated with each echo check message to ascertain the discovered proxy server that is reachable. The method of claim 6, further comprising the round trip based on the measured Arrange the reachable proxy servers for the time. The method of claim 7, wherein initiating the registration process comprises initiating registration with each of the reachable proxy servers starting from a proxy server associated with a minimum round trip time until a connection is established. The method of claim 1, further comprising selecting a proxy server corresponding to a minimum round trip time from the discovered proxy servers. The method of claim 1, further comprising registering a registration procedure with a first server responsive to the echo check messages. The method of claim 10, further comprising maintaining a response to the echo check message received by the server different from the first server. The method of claim 11, further comprising attempting to register with a second server responsive to the echo check message when a registration failure to the first server occurs. A mobile wireless communication device for call initial protocol registration, the mobile wireless communication device comprising: means for discovering a plurality of proxy servers; for transmitting an echo check message from the mobile wireless communication device to each a component of the discovered proxy server, wherein the echo check message solicits a return response; for measuring a round trip time associated with each round trip response received in response to the transmitted echo check message a member; and for starting to the station based on the measured round trip time A component of a registration procedure for at least one of the discovered proxy servers. A mobile wireless communication device comprising: a memory that maintains instructions for: discovering a plurality of proxy servers; transmitting an echo check message from the mobile wireless communication device to each of the discovered proxy servers And wherein the echo check message seeks a return response; measuring a round trip time associated with each round trip response received in response to the transmitted echo check message; and a round trip based on the measured a registration procedure that initiates travel to at least one of the discovered proxy servers; and a processor coupled to the memory configured to perform the retention in the memory Wait for instructions. The mobile wireless communication device of claim 14, wherein the memory is further maintained for obtaining an instruction including a list of the plurality of proxy servers. The mobile radio communication device of claim 14, wherein the transmission of the echo check message to each of the discovered proxy servers occurs in parallel. The mobile wireless communication device of claim 14, wherein the memory further maintains an instruction to issue an echo check message multiple times to collect a plurality of measurements for each of the discovered proxy servers. The mobile wireless communication device of claim 17, wherein the memory is further configured to determine an average round trip time, a minimum round trip time, a maximum round trip based on the plurality of measurements for each of the discovered proxy servers An instruction of at least one of a travel time or an intermediate round trip time. The mobile wireless communication device of claim 14, wherein the memory further maintains an instruction to detect a return response associated with each echo check message to ascertain the reachable discovered proxy server. The mobile wireless communications device of claim 19, wherein the memory further maintains instructions for arranging the reachable proxy servers based on the measured round trip time. The mobile wireless communications device of claim 20, wherein the memory is further maintained for initiating registration with each reachable proxy server from a proxy server associated with a minimum round trip time until a connection is established The instruction so far. The mobile wireless communication device of claim 14, wherein the memory further maintains an instruction to select a proxy server corresponding to a minimum round trip time from the discovered proxy servers. The mobile radio communication device of claim 14, wherein the memory further maintains an instruction to initiate a registration procedure to a first server responsive to the echo check message. The mobile wireless communications device of claim 23, wherein the memory further maintains an instruction to maintain a response to an echo check message received from a server other than the first server. The mobile wireless communication device of claim 24, wherein the memory further maintains an instruction to attempt to register with a second server responsive to the echo check message when a registration failure to the first server occurs. A computer program product for wireless communication via a wireless mobile device, comprising: A computer readable medium comprising: a code for discovering a plurality of proxy servers; and a code for transmitting an echo check message from the wireless mobile device to each of the discovered proxy servers, wherein the echo Checking a message request for a return response; for measuring a code of a round trip time associated with each round trip response received in response to the transmitted echo check message; and for determining based on the amount of the round trip time The program of the registration procedure for at least one of the discovered proxy servers is initiated by measuring the round trip time. A mobile communication device in a wireless communication system, comprising: a processor configured to: discover a plurality of proxy servers; and transmit an echo check message from the mobile communication device to each of the discovered agents a server, wherein the echo check message solicits a return response; measuring a round trip time associated with each round-trip response received in response to the transmitted echo check message; and measuring based on the measurements A registration procedure for at least one of the discovered proxy servers is initiated by the round trip time. A method for registering a call initial protocol for a wireless mobile device by a processor, comprising: receiving at least one echo check message from a wireless mobile device; Transmitting a return message to the wireless mobile device in response to the at least one echo check message; and starting at least in part based on a round trip time required to transmit and receive the at least one echo check message and the return message Registration of the wireless mobile device. The method of claim 28, further comprising registering with at least one server comprising a list of proxy servers. The method of claim 29, wherein registering with the at least one server adds an item to the server list. A communication device for registering an initial call agreement, comprising: means for receiving at least one echo check message from a wireless mobile device; for transmitting a return message to the at least one echo check message a component of the wireless mobile device; and means for initiating registration with the wireless mobile device based at least in part on a round trip time required to transmit and receive the at least one echo check message and the return message. A wireless communication device comprising: a memory that maintains an instruction for receiving at least one echo check message from a wireless mobile device, and transmitting a return message to the at least one echo check message to The wireless mobile device, and initiating registration with the wireless mobile device based at least in part on a round trip time required to transmit and receive the at least one echo check message and the return message; and A processor coupled to the memory configured to execute the instructions retained in the memory. The wireless communication device of claim 32, wherein the memory further retains instructions for registering with at least one server including a list of proxy servers. The wireless communication device of claim 33, wherein the register is registered with the at least one server to add an entry to the server list. A computer program product for wireless communication in a wireless communication system, comprising: a computer readable medium, comprising: code for receiving at least one echo check message from a wireless mobile device; The at least one echo check message transmits a return message to the code of the wireless mobile device; and is configured to perform, at least in part, a round trip time required for transmitting and receiving the at least one echo check message and the return message The code to register with the wireless mobile device is initiated. An apparatus in a wireless communication system, comprising: a processor configured to: receive at least one echo check message from a wireless mobile device; and return a message in response to the at least one echo check message Transmitting to the wireless mobile device; and initiating registration with the wireless mobile device based at least in part on a round trip time required to transmit and receive the at least one echo check message and the return message.