Abstract:
PROBLEM TO BE SOLVED: To provide techniques for efficiently sending control information.SOLUTION: A plurality of control resources are defined and mapped to transmission units for a control segment. For symmetric mapping, multiple sets of control resources are formed, and each batch of L consecutive sets of S control resources is mapped to S transmission units at the same location in the L tiles. For localized mapping, each set of S control resources is mapped to a cluster of S adjacent transmission units in one tile. For distributed mapping, each control resource is mapped to one transmission unit in one tile. For diversity, each control resource is mapped to multiple (e.g., three) transmission units in at least one tile.
Abstract:
PROBLEM TO BE SOLVED: To provide techniques for encoding and decoding data.SOLUTION: Multiple code rates for a forward error correction (FEC) code may be supported, and a suitable code rate may be selected based on packet size. A transmitter may obtain at least one threshold to use for code rate selection, determine a packet size to use for data transmission, and select a code rate among the multiple FEC code rates based on the packet size and the at least one threshold. Multiple FEC codes of different types (e.g., Turbo, LDPC, and convolutional codes) may be supported, and a suitable FEC code may be selected based on packet size. The transmitter may obtain at least one threshold to use for FEC code selection and may select an FEC code among the multiple FEC codes based on the packet size and the at least one threshold.
Abstract:
PROBLEM TO BE SOLVED: To provide a method of efficiently sending signals on a configurable CDMA control segment.SOLUTION: To send signals, transmission parameters for the CDMA control segment 300 for a serving sector are determined. The enabled CDMA signaling channels for a terminal and the average transmission interval for each enabled CDMA signaling channel are determined. For each frame in which the CDMA control segment 300 is sent, the signaling channels to be sent on the CDMA control segment 300 in that frame are determined. The signals for each signaling channel are processed (e.g., encoded, channelized, scaled, and scrambled). The processed signals for all signaling channels are combined and mapped to a time-frequency region used for the CDMA control segment 300 in the frame.
Abstract:
PROBLEM TO BE SOLVED: To provide a system and method for facilitating generating and processing acquisition pilots in wireless communications.SOLUTION: Acquisition pilots that convey timing and frequency synchronization information, wireless system acquisition and system determination information are modulated with pseudorandom sequences. R bits of information carried by the acquisition pilot that conveys system determination information are augmented with T bits that convey a counter index associated with the system timing of superframes transmitted from an access point. The processing overhead resulting from the addition of the T bits is offset by advantages afforded to a wireless communication. Salient advantages include: (i) processing gain at a receiver for communication in a specific sector during asynchronous operation, (ii) packet boundary determination through counter field values, and (iii) initialization of various pseudorandom registers employed for communication.
Abstract:
PROBLEM TO BE SOLVED: To provide transmission schemes that can flexibly achieve a desired spatial multiplexing order, spatial diversity order, and channel estimation overhead order.SOLUTION: For data transmission, assigned subcarriers and a spatial multiplexing order (M) for a receiver are determined (M≥1). For each assigned subcarrier, M virtual antennas are selected from among V virtual antennas formed with V columns of an orthonormal matrix (V≥M). V may be selected to achieve a desired spatial diversity order and channel estimation overhead order. Output symbols are mapped to the M virtual antennas selected for each assigned subcarrier by applying the orthonormal matrix. The mapped symbols are provided for transmission from T transmission antennas (T≥V). Different cyclic delays may be applied for the T transmission antennas to improve diversity.
Abstract:
PROBLEM TO BE SOLVED: To determine a restricted association indicator from a broadcast signal to determine an accessible access point and establish communication therewith.SOLUTION: A restricted association indicator is determined from a received broadcast signal, such as a beacon and a pilot signal (602), and an access point group identifier is obtained on the basis of the indicator (604). It is determined whether the group identifier is in a maintained list of accessible group identifiers (606). Communication is established with a related access point where the identifier is in the maintained list (608).
Abstract:
PROBLEM TO BE SOLVED: To provide a method that enables management of wireless communications in a heterogeneous wireless access point (AP) environment.SOLUTION: System data of an over-the-air message can be configured to include information identifying a distinct type of transmitting base station. In some aspects, the information can include an access type of the base station and/or a sector ID for distinguishing the base station among large numbers of other base stations. According to other aspects, system data transmitted on the wireless signal can include wireless channel resources designated for a particular type of base station, or blanked by the transmitting base station, to facilitate interference reduction on such resources.
Abstract:
PROBLEM TO BE SOLVED: To provide space division multiple access channelization that includes scheduling transmission for two or more terminals and utilizing different code offsets that correspond to different sub-trees.SOLUTION: The transmissions can be scheduled on overlapping frequency resources for overlapping time periods on different spatial resources. The pilot code offsets provide different pilot signatures so that the pilot transmissions do not overlap. The overlapping frequency resources can partially overlap or completely overlap.
Abstract:
PROBLEM TO BE SOLVED: To facilitate management of wireless communications in a large-scale heterogeneous wireless access point (AP) environment.SOLUTION: A preamble of a wireless signal (or, e.g., other data of the wireless signal where suitable) can be transmitted with low resource re-use (or low re-use), referred to as a low re-use preamble (or low re-use data transmission). By way of example, system data of an over-the-air message can be configured to include information identifying a distinct type of transmitting base station. In some aspects, the information can include an access type of the base station and/or a sector ID for distinguishing the base station among large numbers of other base stations. According to other aspects, the information can include wireless channel resources designated for a particular type of base station, or blanked by the transmitting base station, to facilitate interference reduction on such resources.
Abstract:
PROBLEM TO BE SOLVED: To facilitate management of wireless communications in a heterogeneous wireless access point (AP) environment.SOLUTION: System data of an over-the-air message can be configured to include information identifying a distinct type of transmitting base station. In some aspects, the information can include an access type of the base station and/or a sector ID for distinguishing the base station among large numbers of other base stations. According to other aspects, system data transmitted on the wireless signal can include wireless channel resources designated for a particular type of base station, or blanked by the transmitting base station, to facilitate interference reduction on such resources. By employing aspects of wireless communication management, efficient and reliable communication can be affected in large heterogeneous AP networks.