In a data communication system capable of variable rate transmission, high rate packet data transmission improves utilization of the forward link and decreases the transmission delay. Data transmission on the forward link is time multiplexed and the base station transmits at the highest data rate supported by the forward link at each time slot to one mobile station. The data rate is determined by the largest C/I measurement of the forward link signals as measured at the mobile station. Upon determination of a data packet received in error, the mobile station transmits a NACK message back to the base station. The NACK message results in retransmission of the data packet received in error. The data packets can be transmitted out of sequence by the use of sequence number to identify each data unit within the data packets.

Method and apparatus for high-rate packet data transmission

A subscriber unit for use in a multiple access spread-spectrum communication system includes a spread spectrum radio interface, responsive to a rate function signal from a base station, and first and second despreaders. The base station assigns the rate function spread-spectrum message channels and the first despreader recovers and modifies an information signal one of the spread spectrum message channels. The information channel mode is then modified for processing by the second despreader, with the second despreader supporting a different information signal rate. The subscriber unit has a capability of communicating with a dynamically changing a transmission rate of an information signal which includes multiple spread spectrum message channels. The system includes a closed loop power control system for maintaining a minimum system transmit power level for a radio carrier station and the subscriber units, and system capacity management for maintaining a maximum number of active subscriber units for improved system performance.

Code division multiple access (CDMA) communication system

A method for ongoing power control for a communication station with a multiple antenna array, the power control using a method for signal quality estimation applicable for angle modulated signals. One aspect of the ongoing power control method is applicable for the uplink and includes separating the joint determination of a receive weight vector and ongoing power control into a receive weight vector determining part and a separate transmit power adjustment part. In one embodiment, the ongoing power control method for the downlink includes separating the joint determination of a receive weight vector and ongoing power control into a receive weight vector determining part and a separate transmit power adjustment part. The method starts with one part, for example transmit power assignment. Receive weight vector determination is carried out with this assigned transmit power, and the new weights used. An estimate of the resulting received signal quality is obtained and used for new ongoing power adjustment. Another aspect is applicable for the downlink and includes one aspect of the ongoing power control method is applicable for the uplink and includes separating the determination of a complete transmit weight vector including the vector of relative transmit weights and the scaling to use with the relative transmit weights into a part for determining a set of relative transmit weights and a separate transmit power adjustment part that determines the scaling factor.

Power control with signal quality estimation for smart antenna communication systems

A method and apparatus for adaptively obtaining bandwidth requests in a broadband wireless communication system. The method and apparatus includes dynamically varying technique combinations enabling a plurality of users to efficiently request bandwidth from a shared base station. A user may “piggyback” a new bandwidth request upon, or set a “poll-me bit” within, presently allocated bandwidth. A base station may poll users, individually or in groups, by allocating unrequested bandwidth for new requests. Polling may respond to a “poll-me bit,” and/or it may be adaptively periodic at a rate based on communication status parameters, such as recent communication activity and connection QoS levels. Group polling permits a possibility of collisions. Polling policies may be established for dynamically varying user groups, or may be determined for each user. Dynamic selection of appropriate polling techniques makes use of efficiency benefits associated with each technique.

Method and System For Adaptively Obtaining Bandwidth Allocation Requests

An adaptive time division duplexing (ATDD) method and apparatus for duplexing transmissions on a communication link in wireless communication systems. Communication link efficiency is enhanced by dynamically adapting to the uplink and downlink bandwidth requirements of the communication channels. Time slots are flexibly and dynamically allocated for uplink (Ta) or downlink (Tb, Tc, Td) transmissions depending upon the bandwidth needs of a channel. Communication link bandwidth requirements are continuously monitored using sets of predetermined bandwidth requirement parameters. Communication channels configured to have either symmetric or asymmetric uplink/downlink bandwidths depending upon the needs of the channel.

An adaptive time division duplexing method and apparatus for dynamic bandwidth allocation within a wireless communication system

In packet switched data transfer of the cellular radio system, the control of the transmission power comprises characteristics as well of the closed-loop control and the open-loop control. Before forming the connection and during long pauses between the packets, the terminal device measures the control signal transmitted by the base station and compares its signal power (R0) to the target level (t0), that is included by the base station in the control signal as a parameter. The base station informs in the control signal also the transmission power, whereby the terminal device sets the same power to be its transmission power, corrected by the difference between the target level and the measured quality of the link (t0-R0). In addition, also the measured quality of the link (RXQUAL) is transmitted in the acknowledgment messages of the packets, whereby the transmitting device changes its transmission power so that the quality will be controlled to the certain target level. The biggest step of the change is determined by the length of the packets. In the packet transfer downlink, the base station uses first the maximum power and corrects then its transmission power based on the measuring information included in the acknowledgment messages transmitted by the terminal device.

Control of transmission power in wireless packet data transfer

The present invention relates to a method for improving data transmission in a mobile telecommunications system, in which method data is transmitted over the radio path between a mobile station (MS) and a base station (BTS) as bursts in time slots allocated to the mobile station by successive frames. In the invention, a divider (82) splits a data signal (DATAIN) whose speed is higher than the maximum data transfer rate in one frame into at least two signals of lower speed (DATA1, DATA2) before transmission over the radio path. The mobile station (MS) is allocated at least two time slots in each successive frame for high-speed data transmission so that each of said signals of lower speed (DATA1, DATA2) is transmitted over the radio path in its respective time slot. A combiner (85) combines the signals of lower speed (DATA1, DATA2) received over the radio path into the original signal.

Method and arrangement for high-speed data transmission in a tdma mobile telecommunications system

The present invention relates to an improved signal detection method in a TDMA mobile system with co-channel interference. In the method, a primary signal (r1) and at least one interfering co-channel signal (r2-rN) are received on the same TDMA channel (F1, TS3). The co-channel signals propagate through multipath channels (hL,1...hL,N) independent of one another, which provide them with a unique wave form coding. In addition, the co-channel signals have different but known training sequences. In the invention, the multipath channel estimates of the primary signal (r1) and said at least one interfering co-channel signal (r2-rN) are determined by means of the received training sequences. After this, the primary signal is detected by utilizing the transmission channel estimates of both the primary signal and said at least one interfering co-channel signal. The invention also relates to receivers for implementing the method of the invention.

Signal detection in a TDMA system

A method and an arrangement for controlling transmitting power of a mobile station and carrying out a handover in a mobile telecommunications system in which data is transmitted over the radio path between a mobile station and a base station as bursts in time slots of successive frames. A mobile station can be allocated at least two time slots in each frame for high-speed data transmission. The mobile station is arranged to measure the characteristics of the received signal, such as the signal level and/or quality, in each time slot allocated to the mobile station, and the fixed radio network is arranged to control the transmitting power of the mobile station and/or make the decision on a handover on the basis of a combination of measurement results of two or more time slots, or on the basis of the measurement result of the poorest time slot.

Method and arrangement for effecting transmission power control and/or handover of a mobile station assigned two or more time slots per frame in a TDMA telecommunications system

The invention relates to methods and an arrangement for controlling transmitting power of a mobile station (MS) and carrying out a handover in a mobile telecommunications system in which data is transmitted over the radio path between a mobile station and a base station (BTS) as bursts in time slots of successive frames. A mobile station can be allocated at least two time slots in each frame for high-speed data transmission. The mobile station is arranged to measure the characteristics of the received signal, such as the signal level and/or quality, in each time slot allocated to the mobile station, and that the fixed radio network is arranged to control the transmitting power of the mobile station and/or make the decision on a handover on the basis of a combination of measurement results of two or more time slots, or on the basis of the measurement result of the poorest time slot.

Honkasalo Zhichun

Papers

Control of transmission power in wireless packet data transfer

Method and arrangement for high-speed data transmission in a tdma mobile telecommunications system

Signal detection in a TDMA system

Method and arrangement for effecting transmission power control and/or handover of a mobile station assigned two or more time slots per frame in a TDMA telecommunications system

Control of handover and transmission power control of mobile station in a mobile telecommunications system