Abstract: A multi-carrier cellular wireless network (400) employs base stations (404) that transmit two different groups of pilot subcarriers: (1) cell-specific pilot subcarriers, which are used by a receiver to extract information unique to each individual cell (402), and (2) common pilots subcarriers, which are designed to possess a set of characteristics common to all the base stations (404) of the system. The design criteria and transmission formats of the cell-specific and common pilot subcarriers are specified to enable a receiver to perform different system functions. The methods and processes can be extended to other systems, such as those with multiple antennas in an individual sector and those where some subcarriers bear common network/system information.

Abstract: Methods and apparatus in a multi-carrier cellular wireless network with random access improve receiving reliability and reduce interference of uplink signals of a random access, while improving the detection performance of a base station receiver by employing specifically configured ranging signals.

Abstract: In a broadband wireless communication system, a spread spectrum signal is intentionally overlapped with an OFDM signal, in a time domain, a frequency domain, or both. The OFDM signal, which inherently has a high spectral efficiency, is used for carrying broadband data or control information. The spread spectrum signal, which is designed to have a high spread gain for overcoming severe interference, is used for facilitating system functions such as initial random access, channel probing, or short messaging. Methods and techniques are devised to ensure that the mutual interference between the overlapped signals is minimized to have insignificant impact on either signal and that both signals are detectable with expected performance by a receiver.

Abstract: Methods and apparatus in a multi-carrier cellular wireless network with random access improve receiving reliability and reduce interference of uplink orthogonal frequency division multiplex (OFDM) signals of a random access, while improving the detection performance of a base station receiver by employing specifically configured ranging signals. The OFDM signals of the random access are transmitted in a at least one block indicated in configuration information. Uplink signals are transmitted with a timing adjusted based on a received time advance and a power adjusted based on a received power adjustment.

Abstract: A mobile station may comprise a receiver configured to receive, from a base station, a broadcast signal indicating a first subframe configuration for use in an uplink direction and a downlink direction and a second subframe configuration for use in at least a downlink direction. The mobile station may be configured to receive first downlink data and transmit first uplink data, during a single subframe of one or more radio frames, using the first subframe configuration. The mobile station may receive second downlink data, during a single subframe of the one or more radio frames, using the second subframe configuration. The first subframe configuration and the second subframe configuration may be different OFDM subframe configurations and a first subframe configured in accordance with the first subframe configuration and a second subframe configured in accordance with the second subframe configuration may have a same duration.

Abstract: A device for operation in a wireless network may comprise a transmitter configured to transmit protocol information to a plurality of base stations. The protocol information may comprise resource scheduling information and sequence number information. The resource scheduling information may include a bitmap which indicates whether subchannels are organized consecutively or whether subchannels are distributed. The sequence number information may allow the plurality of base stations to sequentially order received packets. The transmitter may be further configured to transmit data, to the plurality of base stations, in accordance with the resource scheduling information and the sequence number information.

Abstract: Hybrid ARQ is employed in a multi-carrier communication system for retransmission of erroneous packets by taking advantage of time/frequency/space diversity and by combining ARQ functions at physical layer and MAC layers, making the multi-carrier system more robust in a high packet-error environment.

Abstract: A mobile station using orthogonal frequency division multiple access (OFDMA). The frequency processing circuitry and the processor of the mobile station are configured to scan spectral bands for a first signal. The first signal having synchronization and cell identification information, and is received in a first band of a cell having a full bandwidth. The first band being within a first bandwidth part and the first bandwidth part being a portion of the full bandwidth of a cell that comprises a plurality of bandwidth parts. Further, the frequency processing circuitry and the processor configured to receive and process signals in the first bandwidth part and configured to switch to receive and process a second bandwidth part, the second bandwidth part being different frequency size than the first bandwidth part.

Abstract: A mobile station using orthogonal frequency division multiple access (OFDMA). The frequency processing circuitry and the processor of the mobile station are configured to scan spectral bands for a first signal. The first signal having broadcast information and being in a first band, the first band being a portion of a full bandwidth of the cell, wherein the broadcast information includes bandwidth information. Further, the frequency processing circuitry and the processor are configured to receive additional broadcast information by processing a second band being in a single sideband in the frequency domain of the full bandwidth of the cell with respect to the first band. Further, the frequency processing circuitry and the processor configured to access the cell using the broadcast information received in both the first band and the second band.

Abstract: An arrangement is disclosed where in a multi-carrier communication system, the modulation scheme, coding attributes, training pilots, and signal power may be adjusted to adapt to channel conditions in order to maximize the overall system capacity and spectral efficiency without wasting radio resources or compromising error probability performance, etc.

Abstract: An arrangement is disclosed where in a multi-carrier communication system, the modulation scheme, coding attributes, training pilots, and signal power may be adjusted to adapt to channel conditions in order to maximize the overall system capacity and spectral efficiency without wasting radio resources or compromising error probability performance, etc.

Abstract: A method performed by a mobile station may comprise receiving information indicating subchannels for transmission of CQIs, in a communication system having an uplink bandwidth divided into subchannels and a time domain having frames divided into subframes having a same time duration. Each subframe may have a plurality of OFDM symbols. The method may further comprise periodically transmitting CQI in subframes based on a subframe number and in subchannels based on the information indicating the subchannels. The mobile station may receive a poll to transmit a CQI and may transmit a CQI in a subframe based on the poll. The mobile station may receive an OFDM signal including a first packet having a header portion including a plurality of second packets, each of the plurality of second packets having a header portion.

Abstract: Methods and apparatus for multi-carrier communication with variable channel bandwidth are disclosed, where the time frame structure and the OFDM symbol structure are invariant and the frequency-domain signal structure is flexible. In one embodiment, a mobile station, upon entering a geographic area, uses a core-band to initiate communication and obtain essential information and subsequently switches to full operating bandwidth of the area for the remainder of the communication. If the mobile station operates in a wide range of bandwidths, the mobile station divides the full range into sub-ranges and adjusts its sampling frequency and its FFT size in each sub-range.

Abstract: A multi-carrier cellular wireless network (400) employs base stations (404) that transmit two different groups of pilot subcarriers: (1) cell-specific pilot subcarriers, which are used by a receiver to extract information unique to each individual cell (402), and (2) common pilots subcarriers, which are designed to possess a set of characteristics common to all the base stations (404) of the system. The design criteria and transmission formats of the cell-specific and common pilot subcarriers are specified to enable a receiver to perform different system functions. The methods and processes can be extended to other systems, such as those with multiple antennas in an individual sector and those where some subcarriers bear common network/system information.

Abstract: A method for receiving broadcast information in an OFDM communication system may comprise receiving, by a mobile station, a periodically broadcast scheduling message from a base station which indicates for each type of a plurality of types of broadcast information included in broadcast information, a pattern of frames to monitor for the type of broadcast information and indicates a length of time to monitor. The mobile station may monitor for information corresponding to at least one of the plurality of types of broadcast information, based on the periodically broadcast scheduling message.

Abstract: A device for operation in a wireless network may comprise a transmitter configured to transmit protocol information to a plurality of base stations. The protocol information may comprise resource scheduling information and sequence number information. The resource scheduling information may include a bitmap which indicates whether subchannels are organized consecutively or whether subchannels are distributed. The sequence number information may allow the plurality of base stations to sequentially order received packets. The transmitter may be further configured to transmit data, to the plurality of base stations, in accordance with the resource scheduling information and the sequence number information.

Abstract: Methods and apparatus for subframe configuration and generation in a multi-cell multi-carrier system. A frame for radio transmission in the system consists of multiple subframes, and each subframe consists of multiple Orthogonal Frequency Division Multiplexing (OFDM) symbols. Training symbols, frequency-domain data scrambling, size of Fast-Fourier Transform (FFT), or length of cyclic prefix can be configured differently for each subframe to facilitate different applications, such as unicasting or broadcasting.

Abstract: An arrangement is disclosed where in a multi-carrier communication system, the modulation scheme, coding attributes, training pilots, and signal power may be adjusted to adapt to channel conditions in order to maximize the overall system capacity and spectral efficiency without wasting radio resources or compromising error probability performance, etc.

Abstract: A method performed by a mobile station may comprise receiving information indicating subchannels for transmission of CQIs, in a communication system having an uplink bandwidth divided into subchannels and a time domain having frames divided into subframes having a same time duration. Each subframe may have a plurality of OFDM symbols. The method may further comprise periodically transmitting CQI in subframes based on a subframe number and in subchannels based on the information indicating the subchannels. The mobile station may receive a poll to transmit a CQI and may transmit a CQI in a subframe based on the poll. The mobile station may receive an OFDM signal including a first packet having a header portion including a plurality of second packets, each of the plurality of second packets having a header portion.

Abstract: A mobile station may comprise a receiver configured to receive, from a base station, a broadcast signal indicating a first subframe configuration for use in an uplink direction and a downlink direction and a second subframe configuration for use in at least a downlink direction. The mobile station may be configured to receive first downlink data and transmit first uplink data, during a single subframe of one or more radio frames, using the first subframe configuration. The mobile station may receive second downlink data, during a single subframe of the one or more radio frames, using the second subframe configuration. The first subframe configuration and the second subframe configuration may be different OFDM subframe configurations and a first subframe configured in accordance with the first subframe configuration and a second subframe configured in accordance with the second subframe configuration may have a same duration.