Abstract: A method and system for scheduling data in the down, or forward, link, on a per packet basis in a wireless telecommunications network. The scheduler determines the order of packets to be sent from multiple queues based on per IP QoS, real time channel condition and real time buffer occupancy. The scheduler determines the necessary support link adaptation on a per packet basis based on per packet QoS and the channel condition. The scheduling system and method take into consideration both upper layer per packet QoS, for example packet delay bound, and the real time channel condition (C/I) for each mobile terminal. The method of the present invention also determines the layer 2 frame length for each scheduled packet.

Abstract: A system and method reduces cross-beam interference in multi-beam wireless data-transmission system through temporal separation of the multiple beams. A sector of a cell is geographically divided such that a number of beam patterns correspond to a number of user-group areas. For example, the sector can be divided such that four user-group areas are created. The number of groups and beam patterns can be increased or decreased. Forward link transmissions from a base station to a plurality of user terminals are patterned such that transmissions to adjacent user-group areas do not occur during the same time intervals. According to one operation, pilot signal transmissions are suppressed within a beam if no data is transmitted during a corresponding temporal period. According to another operation, temporal guard slots are introduced to avoid inter-cell interference. Further, in some operations, user terminals report to the base station to indicate one or more preferred user-group areas for their inclusion.

Abstract: A method and apparatus are provided for selecting and signalling the identity of sub-carriers to be used for transmission of data in a radio communication system, and for using other sub-carriers. A remote unit determines which sub-carriers are acceptable for use in data transmission by comparing the signal to interference ratio of each sub-carrier with a threshold. A sequence of numbers is generated using one set of values to identify acceptable sub-carriers and another set of values to identify unacceptable sub-carriers. The sequence of numbers is transmitted to a base station. The average signal to interference ratio of sub-carriers whose signal to interference ratio was above the threshold can also be transmitted to the base station, thereby allowing the base station to determine an optimum set of transmission parameters for use only in the acceptable sub-carriers. Alternatively, the remote unit can determine the optimum set of transmission parameters itself for transmission to the base station.

Abstract: A method and system for selecting a station, in a communication system having a plurality of stations, for communication with a device based on station load conditions is provided. A plurality of base stations determine their station load condition. Station transmit power level is adjusted for at least a part of a transmitted signal in each of the plurality of stations in accordance with the respective determined station load condition. A device receives the transmitted signal from at least one of the plurality of stations and selects a station for communication. The station selection is made by the device based at least in part on a received power level of the adjusted portion of the transmitted signal.

Abstract: A method and apparatus are provided for selecting and signaling the identity of sub-carriers to be used for transmission of data in a radio communication system, and for using other sub-carriers. A remote unit determines which sub-carriers are acceptable for use in data transmission by comparing the signal to interference ratio of each sub-carrier with a threshold. A base station transmits data over the acceptable sub-carriers at the optimum Link Mode or Link Modes. The base station may use some of the unacceptable sub-carriers for transmission of low sensitivity data at the optimum Link Mode, and may use some of the unacceptable sub-carriers for transmission of data at a lower Link Mode. The transmission power any unused unacceptable sub-carriers can be diverted to other sub-carriers.

Abstract: A method is provided for adapting modulation schemes to changing channel quality with reduced overhead signalling. A remote unit measures the channel quality of a radio channel along which a signal from a base station reached the remote unit. Based on the channel quality, the remote unit determines a desired set of transmission parameters from a list of sets of transmission parameters. The remote unit determines a difference in position within the list between the current set of transmission parameters and the desired set of transmission parameters. The remote unit transmits the difference to the base station, which selects a new set of transmission parameters using the current set of transmission parameters and the difference. The method requires little signalling between the remote unit and the base station, and is particularly beneficial in communication systems employing many sub-carriers, such as OFDM systems.

Abstract: A frame structure that is optimized for providing variable high data rates. Superframes, each comprised of a predetermined number of frames, carry data communications at one or more variable data rates. Each data customer is allotted one or more frames or portions of frames within the superframe, called sub-frames, as is needed to deliver the data communication. The allocation for the data customers is not fixed, but varies as the data rate varies over time, and also to meet the needs of the data customers. Each high speed data frame includes a self-indication of the contents of the high speed data frame. This self-indication identifies one or more data users serviced by the high speed data frame and the data rate of the data contained in the high speed data frame. Each high speed data frame may service multiple user terminals, with the high speed data frame subdivided into two or more subframes.

Abstract: A method and apparatus are provided for selecting an optimum base station for communicating with a terminal in a wireless communication system. A base station controller stores two candidate sets for each terminal within communication range of the base stations controlled by the base station controller. One candidate set lists base stations for which the channel quality of the uplink channel between the base station and the terminal is acceptable for communication. The other candidate set lists base stations for which the channel quality of the downlink channel between is acceptable for communication. This allows the base station controller to take into account the predominant direction of traffic when assigning base stations for communication with the terminal.

Abstract: A method, device and base station for using a code division multiple access carrier for wireless reverse link communication between the device and the base station. An operational profile of the device is determined in which the operational profile includes a degree of unit mobility. A first carrier for wireless code division multiple access communication from the device to the base station is selected based on the determined operational profile of the device. A wireless communication link between the device and the base station is established using the first carrier. According to one aspect, the first carrier is one of an asynchronous code division multiple access signal and a synchronous code division multiple access signal.

Abstract: A method for sharing transmission of control messages over high data rate networks. Whenever there are data transmitted on the downlink, the control messages are piggybacked. If there is no data transmitted on the downlink, a shared control MAC frame is used. The variable size shared control MAC frame includes same type of control messages for a plurality of fixed terminals. Control information identifiers (CIIDs) are used to indicate the type of the transmitted control messages. The appropriate control information is timely delivered to an identified terminal. Such scalable MAC frame allows for flexibility and an efficient use of high data rate (HDR) transmissions.

Abstract: A method and apparatus are provided for error correction in a communication system employing Orthogonal Frequency Division Multiplexing. When a remote unit receives an OFDM symbol, a retransmission indicator bit is examined to determine whether the symbol is an original symbol or a retransmitted symbol. If it is a retransmitted symbol and the remote unit has a corresponding symbol stored in memory, then the received symbol is soft-combined with the stored symbol. Each packet in the symbol, either the received symbol if original or the soft-combined symbol if retransmitted, is examined by the remote unit. If the remote unit determines that a particular packet is intended for the remote unit, but can not determine the contents of the payload of the packet, the remote unit sends a retransmission request to the base station for retransmission of the symbol.

Abstract: A frame structure that is ordinarily optimized for providing variable high data rates also includes the flexibility to efficiently carry lower data rate, lower latency frames using sub-framing. Superframes, each comprised of a predetermined number of frames, carry voice and data communications at one or more variable data rates. The size of a superframe is limited, such as by the delay tolerance for voice transmission, typically 20 ms. Each voice customer is allotted one or more frames or portions of frames within the superframe, called sub-frames, as is needed to deliver the lower data rate, low latency voice communication. The allocation for the voice customers is not fixed, but varies as the data rate varies over time. Any bits in a frame that are not needed to carry voice communication are assigned to carry data having compatible data rate requirements. Additionally, the sub-framing concept may be extended to include ATM cells.

Abstract: A frame structure that is ordinarily optimized for providing variable high data rates also includes the flexibility to efficiently carry lower data rate, lower latency frames using sub-framing. Superframes, each comprised of a predetermined number of frames, carry voice and data communications at one or more variable data rates. The size of a superframe is limited, such as by the delay tolerance for voice transmission, typically 20 ms. Each voice customer is allotted one or more frames or portions of frames within the superframe, called sub-frames, as is needed to deliver the lower data rate, low latency voice communication. The allocation for the voice customers is not fixed, but varies as the data rate varies over time. Any bits in a frame that are not needed to carry voice communication are assigned to carry data having compatible data rate requirements. Additionally, the sub-framing concept may be extended to include ATM cells.

Abstract: A system and method for transmitting high speed data on fixed rate and for variable rate channels. The system and method provides the flexibility of adjusting the data rate, the coding rate, and the nature of individual retransmissions. Further, the system and method supports partial soft combining of retransmitted data with previously transmitted data, supports parity bit selection for successive retransmissions, and supports various combinations of data rate variations, coding rate variations, and partial data transmissions.

Abstract: A system and method reduces cross-beam interference in multi-beam wireless data-transmission system through temporal separation of the multiple beams. A sector of a cell is geographically divided such that a number of beam patterns correspond to a number of user-group areas. For example, the sector can be divided such that four user-group areas are created. The number of groups and beam patterns can be increased or decreased. Forward link transmissions from a base station to a plurality of user terminals are patterned such that transmissions to adjacent user-group areas do not occur during the same time intervals. According to one operation, pilot signal transmissions are suppressed within a beam if no data is transmitted during a corresponding temporal period. According to another operation, temporal guard slots are introduced to avoid inter-cell interference. Further, in some operations, user terminals report to the base station to indicate one or more preferred user-group areas for their inclusion.