Abstract: A mobile station (106) establishes a real time communication link via an access point (102) for carrying voice or other time-sensitive data. A WLAN subsystem (204) of the mobile station is normally kept in a low power state. Upon initiating a communication link the mobile station signals to the access point that unscheduled power save delivery mode will be used (614), and the access point reserves resources to assure the necessary quality of service. The mobile station initiates a frame transaction by first powering up the WLAN subsystem (712), acquiring the WLAN channel (407), and transmitting a polling frame. Upon successful receipt of the polling frame the access point prepares to reply with an aggregate response. The aggregate response commences by transmitting all data in an aggregate buffer, including both reserved and unreserved data buffers. Upon successful receipt of the aggregate response, the mobile station places the WLAN subsystem back into a low power state.

Abstract: A method and system for wireless communications between a base transceiver station and a mobile unit which provides necessary guard times in the downlink signal burst while maintaining the same bit rate in both the downlink and uplink signal bursts is disclosed. Downlink signal bursts are modulated using a first modulation technique and uplink signal bursts are modulated using a second modulation technique. Preferably, the first modulation technique is a higher-order than the second modulation technique. The first modulation technique may be 16 QAM while the second modulation technique may be 4 QAM or ?/4 QPSK.

Abstract: To address the need for an apparatus and method for CDMA-dispatch soft handoff, the present invention enables mobile-initiated soft handoff for dispatch calls. A mobile station (120) in a dispatch call establishes an individual inbound link (137) with the serving base site (111). When the mobile station determines that a handoff with an adjacent site (112) is needed, the mobile station uses its individual inbound link to request a soft handoff with the adjacent base site. After notifying the adjacent base site, the serving base site then transmits the handoff information to the mobile station to enable the mobile station to begin a soft handoff with the adjacent site.

Abstract: In a wireless communication system (100) having a plurality of communication cells (115, 117), and a plurality of mobile stations (118) operating within selected ones of the multiple communication cells (115, 117), a method and an apparatus for selecting those communication cells (115, 117). Within each communication cell (115, 117), a base station (112) transmits a message directed to the mobile stations (118), and detects a response indicator in the selected ones of the plurality of communication cells (115, 117). The message may be a broadcast page message transmitted by the base station (112). The response indicator may be an impulse radio-frequency energy transmission generated by the plurality of mobile stations (118) operating within the selected ones of the plurality of communication cells (115, 117).

Abstract: To address the need for an apparatus and method for CDMA-dispatch soft handoff, the present invention provides soft handoff to mobile stations (MSs) (120-123) in a dispatch call by sharing soft handoff information with all the MSs in the call at a base site (111). When a first MS (e.g., 120) needs to soft handoff, the identity of a soft handoff channel (135) at an adjacent base site (112) is shared with all the MSs. Thus, subsequent MSs (e.g. 122) that need to soft handoff to that adjacent base site may do so without requesting a soft handoff.

Abstract: To address the need for an apparatus and method for CDMA-dispatch soft handoff, the present invention enables mobile-initiated soft handoff for dispatch calls. A mobile station (120) in a dispatch call establishes an individual inbound link (137) with the serving base site (111). When the mobile station determines that a handoff with an adjacent site (112) is needed, the mobile station uses its individual inbound link to request a soft handoff with the adjacent base site. After notifying the adjacent base site, the serving base site then transmits the handoff information to the mobile station to enable the mobile station to begin a soft handoff with the adjacent site.

Abstract: To address the need for an apparatus and method for CDMA-dispatch soft handoff, the present invention enables base-initiated soft handoff for dispatch calls. A mobile station (120) in a dispatch call establishes an individual inbound link (137) with the serving base site (111). The serving base site and one or more adjacent base sites (e.g., 110 and 112) determine the signal quality of the inbound link transmissions of the mobile station. The adjacent base site with the highest received inbound link signal quality is selected as the target soft handoff site. The serving base site then transmits the handoff information to enable the mobile station to begin a soft handoff with the target site.

Abstract: To address the need for an apparatus and method for quickly establishing a CDMA dispatch call, the present invention provides for paging mobile stations (e.g., 120-123) to inform them of the call and then starting the dispatch call without waiting for page responses from the call participants. The dispatch call is first transmitted by base sites (e.g., 110-112) of all the service coverage areas (e.g., 101-103) that may have call participants, and then discontinued at those base sites where no page responses are received within a period of time. Thus, the dispatch call is established while “call setup” effectively continues.

Abstract: A method and apparatus are provided for reducing delivery time latency in data transferred between a packet data service network and mobile data device. The method includes the steps of detecting an indicia of bandwidth needed for information to be transferred from the packet data service network to the mobile data device, comparing an attribute of the indicia with a predetermined criteria and notifying a wireless interface controller servicing the wireless data device when the attribute of the data block exceeds the predetermined file criteria.

Abstract: A switched gain differential amplifier is provided which includes first and second differential transconductance amplifier stages and a disabled dummy differential transconductance amplifier stage. The first and second differential transconductance amplifier stages have respective differential inputs that are coupled in-phase to one another and respective differential outputs that are coupled in-phase to one another. At least one of the stages is selectively enabled. The disabled dummy differential transconductance amplifier stage has a differential input coupled in-phase to the differential inputs of the first and second differential transconductance amplifier stages and a differential output cross-coupled out-of-phase to the differential outputs of the first and second differential transconductance amplifier stages.

Abstract: A controller (120), in response to receiving a request for a group call (201) targeting a group (101), allocates at least one power adjustment channel to the group call (202) and sends identification of the at least one power adjustment channel to at least some of the subscriber units in the group (203). Using the at least one power adjustment channel, the controller also sends unique power adjustment information to each of the at least some subscriber units (204). Unique power adjustment channel access information is also sent to the subscriber units so that each subscriber unit can receive its own unique power adjustment information (503) and adjust its inbound transmission power (504) in response. In this manner, efficient reverse power control is provided for multiple subscriber units thereby facilitating group calls in CDMA systems.

Abstract: A communications system for providing packet data service to mobile stations (110) performs registration of the mobile station prior to engaging in packet data service. The registration procedure includes sending a request to register (300) to a DAP (113), transferring (302) subscriber data from a HLR (124) to a D-VLR (126), authenticating (306) the mobile subscriber, selecting a mobile data gateway (116) to service the mobile station, transferring (308) the subscriber data from the D-VLR to the mobile data gateway, and establishing (312) a packet data link between the mobile data gateway and the mobile station.

Abstract: A controller (120), in response to receiving a request for a group call (201) targeting a group (101), allocates at least one power adjustment channel to the group call (202) and sends identification of the at least one power adjustment channel to at least some of the subscriber units in the group (203). Using the at least one power adjustment channel, the controller also sends unique power adjustment information to each of the at least some subscriber units (204). Unique power adjustment channel access information is also sent to the subscriber units so that each subscriber unit can receive its own unique power adjustment information (503) and adjust its inbound transmission power (504) in response. In this manner, efficient reverse power control is provided for multiple subscriber units thereby facilitating group calls in CDMA systems.

Abstract: The present invention provides a method and apparatus for group calls in wireless CDMA communication systems, addressing the need for reliable and efficient reverse power control in CDMA group calls. A communication infrastructure (108-110) upon receiving a group call request from a communication unit (e.g., 103), allocates a single voice channel (e.g., 120-121) in each cell that provides service to one or more communication units of the group (101). The communication infrastructure further allocates a reverse power control channel (e.g., 125-127) to each communication unit of the group. Thus, each communication unit of the group receives voice information for the group call via the voice channel in that communication unit's site or cell, and each communication unit receives inbound (i.e., reverse) power control information via the reverse power control channel allocated to that communication unit.

Abstract: A quality dispatch service on a CDMA based wireless system. To achieve spectral efficiency and fast access for follow-up calls, in response to a request by a talkgroup member to have a group call established, the non-requesting (listening-only) members are allowed to establish a low-rate (non-voice) signaling link in the reverse direction (inbound) for the limited purpose of (i) providing forward power control information to the fixed infrastructure; (ii) requesting soft hand-off when required; and (iii) maintaining the correct reverse link power control to allow for fast channel access for a follow-on call. In accordance with the illustrative embodiment, the establishment of low-rate inbound signaling links occurs prior to beginning the voice communications.

Abstract: A communications system (100) has a TDMA signal (110) accessed by one or more mobile stations (104). The TDMA signal carries both circuit switched and packet data service. A packet channel is defined within a packet data frame (208) by assigning time slots not used by other services during the packet data frame to the packet channel. A packet data seed channel (204) is used to anchor the packet channel and steer a mobile station to the packet channel. In the packet data seed channel a dynamic allocation protocol (DCAP) slot (206) appears and carries the packet channel slot assignments for the next occurring packet data frame.

Abstract: In a resource allocator (106), a reserved resource group comprising at least one communication resource is maintained for use in supporting non-queued services. When a request for the at least one non-queued service is received, a communication resource from the reserved resource group is allocated to the request (305). When the reserved resource group becomes depleted, at least one more communication resource is assigned to the reserved resource group with greater preference relative to allocation of communication resources to requests for at least one queued service (307). In a preferred embodiment, a communication resource is assigned to the reserved resource group prior to allocating resources to any queued service requests. Additionally, communication resources (200) having varying grades of service can be accommodated.

Abstract: A quality dispatch service on a CDMA based wireless system. To achieve spectral efficiency and fast access for follow-up calls, in response to a request by a talkgroup member to have a group call established, the non-requesting (listening-only) members are allowed to establish a low-rate (non-voice) signaling link in the reverse direction (inbound) for the limited purpose of (i) providing forward power control information to the fixed infrastructure; (ii) requesting soft hand-off when required; and (iii) maintaining the correct reverse link power control to allow for fast channel access for a follow-on call. In accordance with the illustrative embodiment, the establishment of multiple inbound signaling links in a CDMA dispatch call occurs as a background process while beginning the voice communications immediately.

Abstract: A new data circuit equipment (DCE) coupled to an IWF and a terminal adapter (TA) coupled to a mobile station provide interconnection within a RF communication system such that Class 2 service common to wireline network equipment can be beneficially employed in the wireless RF communication system. The new DCE and TA are transparent to external wireline systems while maintaining compatibility with, inter alia, the predetermined data service protocol layers of the RF communication system, the RF air-interface and/or radio link protocol (RLP) of the RF communication system.

Abstract: A communication device (e.g., 106) having multiple transmission modes employs a method of transmitting user information (309, 310) and intermittent overhead data (307, 308). The communication device (106) selects from a first transmission technique and a second transmission technique. When the first transmission technique is selected and overhead data (307) is to be transmitted, the communication device (106) replaces a first predetermined amount of the user information (309) with the overhead data (307) to form a data unit. When the second transmission technique is selected and overhead data (308) is to be transmitted, the communication device (106) replaces a second predetermined amount of the user information (310) with the overhead data (308) to form the data unit, wherein the second predetermined amount is less than the first predetermined amount.