Abstract: A method and apparatus for interworking between push-to-talk over cellular (PoC) systems and instant messaging (IM) systems is provided. An interworking entity that behaves like a PoC client to a PoC server and as an IM client to the IM server is provided. The interworking entity may be implemented as part of the PoC server or the IM server. The interworking entity listens to talk bursts from the PoC server and when it receives a talk burst the interworking entity sends the message to the IM client via the IM server. In an embodiment, the interworking entity listens to talk bursts or audio clips from the IM server and when it receives them, stores them in a temporary storage memory and converts them to a streaming format. The interworking entity then requests the floor from the PoC server, and, once the floor is granted, streams the stored audio clip or talk burst to the PoC server. The PoC server then distributes the clips to the PoC clients.

Abstract: A method and apparatus of providing packet data services that includes establishing an over-the-air communication connection between a mobile station and a wireless network infrastructure. The mobile station communicates a version and capability indication of a wireless packet data standard supported in the mobile station to the wireless network infrastructure. The wireless network infrastructure communicates a version and capability indication of the wireless packet data standard supported in the network infrastructure to the mobile station. Operation of the mobile station and wireless network infrastructure are adjusted in accordance with the indicated versions and capabilities.

Abstract: Methods and apparatus for optimal participation of devices in a peer-to-peer overlay network. A method for dynamically configuring a node includes operating on an overlay network using a first participation mode, obtaining at least one configuration parameter, selecting a second participation mode for operation on the overlay network based on local policy and the at least one configuration parameter, and configuring the node to participate on the overlay network based on the second participation mode. An apparatus for dynamic node configuration includes a memory coupled to a processor and configured to operate on an overlay network using a first participation mode, obtain at least one configuration parameter, select a second participation mode for operation on the overlay network based on local policy and the at least one configuration parameter, and configure the node to participate on the overlay network based on the second participation mode.

Abstract: To access a first communication system, a terminal determines a transmission time for an access probe, an expected response time from the system, and a protected time interval based on the transmission time and/or expected response time. The terminal determines a starting time for sending the access probe such that the protected time interval does not overlap a tune-away interval in which the terminal is to monitor anther frequency/air-interface. This starting time may be set initially to the end of a prior access probe plus a pseudo-random wait duration and may be advanced forward or moved backward in time, if needed, by a time duration selected such that the protected time interval does not overlap the tune-away interval.

Abstract: Systems and methods of securing wireless communications between a network and a subscriber station include inserting a marker denoting an encryption type within a random value used for authentication, calculating a first session key and a first response value as a function of the random value, then calculating a second session key and a second response value as a function of the random value, first session key and first response value. The two levels of session keys and response values may be used by upgraded subscriber stations and network access points to prevent attackers from intercepting authentication triplets.

Abstract: Quick frequency tracking (QFT), quick time tracking (QTT), and non-causal pilot filtering (NCP) are used to detect sporadically transmitted signaling, e.g., paging indicators. For QFT, multiple hypothesized frequency errors are applied to an input signal to obtain multiple rotated signals. The energies of the rotated signals are computed. The hypothesized frequency error with the largest energy is provided as a frequency error estimate. For QTT, coherent accumulation is performed on the input signal for a first set of time offsets, e.g., early, on-time, and late. Interpolation, energy computation, and non-coherent accumulation are then performed to obtain a timing error estimate with higher time resolution. For NCP, pilot symbols are filtered with a non-causal filter to obtain pilot estimates for one antenna for non-STTD and for two antennas for STTD. The frequency and timing error estimates and the pilot estimates are used to detect the signaling.

Abstract: Methods and systems to enhance local repair in robust header compression (ROHC) decompressors (110, 114), which may improve network transmission efficiency and quality. One method uses lower layer information to enhance local repair at the decompressor (110, 114). Another method uses a User Datagram Protocol (UDP) checksum to enhance local repair at the decompressor (110, 114).

Abstract: Systems and methods for determining the home network carrier associated with a mobile station and authorizing the provision of services to the mobile station using centralized storage of mobile station and home network information. In one embodiment, when a roaming mobile station attempts to access services, identifying information for the mobile station is used by a local server to query a centralized DNS server that stores a mapping of mobile station identifying information to corresponding home networks. The centralized DNS server returns an identification of the home network of the roaming mobile user, and the home network then determines whether to grant or deny the mobile station access to the local network. The mobile station identifying information may comprise an MSID such as an MIN, IRM or IMSI, which may serve as part of the address for the query to the centralized DNS server.

Abstract: A method and an apparatus for secure registration for a multicast-broadcast-multimedia system (MBMS) are disclosed. A random number is generated by a broadcast-multicast-service center (BM-SC) and broadcast to user equipment in the coverage area of a radio access network (RAN). A memory module or smart card (UICC) in the user equipment generates a radio access network key (RAK) which is a function of the random number and a key selected from the group consisting of a public land mobile network key (PK) and a broadcast access key (BAK), and then generates a temporary registration key (RGK) as a function of the RAK, a service identification number and a user identification number, for example, P-TMSI, which may be extracted by the RAN to authenticate the registration as legitimate.

Abstract: Methods and apparatus for selecting a serving sector in a high rate data (HDR) communication system are disclosed. An exemplary HDR communication system defines a set of data rates, at which a sector of an Access Point may send data packets to an Access Terminal. The sector is selected by the Access Terminal to achieve the highest data throughput while maintaining a targeted packet error rate. The Access Terminal employs various methods to evaluate quality metrics of forward and reverse links from and to different sectors, and uses the quality metrics to select the sector to send data packets to the Access Terminal.

Abstract: Method and apparatus for hashing mobile stations to frequencies in a communication system. The method uses two-level hashing to assign a mobile station first to a frequency band and then to a specific frequency within the frequency band. Embodiments allow for weights to be assigned to frequencies and mobiles hashed to the weighted frequencies. Weighting allows for a non-uniform distribution of mobile stations among frequencies to optimize system operating parameters.

Abstract: A method and apparatus for selecting a favored transmission slot for communicating non-voice data in conjunction with a voice-data communication. The slot, reflecting a favored power level and transmission rate for transmitting the non-voice data on a supplemental channel, is selected based upon the transmission power levels for voice-data transmitted by a base station to a remote station on a fundamental channel. The favored transmission slot is selected without the remote station messaging information to the base station concerning frequency channel or interference information for the supplemental channel.

Abstract: Method and apparatus for detection and selection of Wireless Local Area Network (WLAN) service. A cellular network may provide an advertisement for a WLAN, such as in an overhead signaling message. The advertisement may identify the Access Point(s) by an Extended Service Set Identifier (ESSID). The remote station may then scan for the WLAN service automatically or manually.

Abstract: Systems and methods of securing wireless communications between a network and a subscriber station are disclosed. One embodiment creates authentication triplets due to expire after a certain amount of time such that they may not be used indefinitely by an attacker who intercepts them.

Abstract: A high data rate system capable of inter-frequency handoffs with little or no interruption in data service. The access network sends data from the first sector to the access terminal at the first frequency. The access terminal measures a parameter of a signal received at the access terminal from the second sector at the second frequency, wherein a pre-active set of the access terminal includes the second sector, and wherein an active set of the access terminal consists of one or more sectors operating in the first frequency. The access terminal then sends a data source control message corresponding to the second sector to the access network, after which the access terminal switches the pre-active set and the active set.

Abstract: In a multiple-access network, network access terminals conduct peer-to-peer communications on reverse link channels of the network.

Abstract: A method and apparatus for implicit floor control in push-to-talk over cellular system. A message is generated by a client in a communication system and is then streamed to a push-to-talk server. The server checks to see if the floor is idle, and if so, distributes the message to at least one other participant in the communication session. If the floor is not idle, the new message is stored and queued for distribution after all other messages ahead of the last received message have been distributed.

Abstract: Techniques for dynamically configuring IP and providing IP connectivity for a terminal equipment attached to a wireless device are described. The wireless device obtains from a wireless network a dynamically assigned IP address, an IP gateway's IP address, a subnet mask, or none or any combination thereof. Wireless device determines a host IP address (which may be the dynamically assigned IP address), a router IP address (which may be the gateway IP address or a spoofed IP address), a server IP address (which may be the router IP address), and a subnet mask (which may be obtained from the wireless network or spoofed by the wireless device). Wireless device, acting as a DHCP server, provides IP configuration for the terminal equipment, acting as a DHCP client. Wireless device thereafter forwards IP packets exchanged between the terminal equipment and wireless network and processes DHCP packets from the terminal equipment.

Abstract: Systems and techniques are disclosed relating to wireless communications. The systems and techniques involve wireless communications wherein a packet data session may be established between a wireless communications device and a packet data serving node to support a network connection to a packet-switched network. The wireless communications device may be configured to receive a notification of an incoming call from a circuit-switched network even when the network connection is active.

Abstract: Various schemes for performing inter-system handoff, e.g., from a UTRAN to a cdma2000 radio access network (RAN) are described. For a MAHHO scheme, the UTRAN uses measurements obtained by a multi-RAT device to determine suitable cdma2000 cell(s) for handover. The measurements are obtained by a candidate frequency search procedure, and the handover is accomplished by a handoff execution procedure. For a MDHHO scheme, the UTRAN relies on location information for the multi-RAT device to select suitable cdma2000 cell(s) for handover. For a CRHHO scheme, a new call is established on the cdma2000 RAN and the pending call on the UTRAN is released in a manner such that the handover appears seamless to the multi-RAT device. The multi-RAT device includes two modem processors that perform processing for the UTRAN and cdma2000 RAN and an application processor that controls the modem processors.