Abstract:
A temporary (temp) dedicated channel (DCH) is used to support communications. The temp-DCH channel is a channel that is assigned to a user having a set duration. After the duration expires, the channel is automatically released to the user. Embodiments of the invention relate to establishing the temp-DCH channel, determining the data rate and duration of the channel. Other embodiments relate to establishing back-to-back temp-DCH channels and the implementation details of these embodiments. Additionally, one embodiment relates to adding a start/stop function to the medium access controller which can be used in conjunction with temp-DCH as well as other applications.
Abstract:
A method and apparatus employing algorithms enabling cellular networks to determine the range of code transmit power in downlink, as well as uplink, power control. Two exemplary algorithms provide a determination of an appropriate transmit power range for each code so that when the transmit power of any code approaches an upper limit, the transmit power of the other codes can be adjusted to catch up with the dynamic range. Even though the two exemplary algorithms have functional similarities, in the second algorithm, the frequency of reconfiguration of code transmit power range is much less than the frequency of change of the number of codes. Both algorithms are applicable for use in all modes of transmission in UMTS systems.
Abstract:
A method and system is disclosed for optimizing resource management in wireless communication systems wherein resources in neighboring and serving cells may be reassigned so that fragmentation may be reduced in serving cells. Resources in wireless communication systems are preferably managed to minimize fragmentation and where fragmentation can not be reduced based on current resource allocations, resources may be reassigned to allow fragmentation to be reduced.
Abstract:
A method and system for assigning resources in wireless communication systems is disclosed. Timeslots allocated for handling user traffic are evaluated to create a plurality of timeslot sequences. Resources are assigned to the allocated timeslots according to the timeslot sequence having the lowest total interference.
Abstract:
A method and strategy by which cellular networks can dynamically adapt a radio link according to changing conditions of interference. In particular, the method applies to uplink time slots in UMTS-TDD systems. A preferred embodiment describes performing dynamic link adaptation when a UE has two CCTrCHs in an uplink time slot. The method and strategy of the invention are applicable for UMTS-FDD, CDMA-2000, and other systems as well.
Abstract:
A method and system for performing call admission control in wireless communication systems is disclosed. Resource units required by a new user are assigned based on an outage probability of each uplink timeslot. The outage probability of each timeslot is updated as the resource units are assigned so that each resource unit assignment results in the lowest possible contribution to total outage probability. Once all of the resource units are assigned, the total outage probability is computed based on the resource allocation. If the total outage probability is below a predetermined value, the new user is admitted. If the total outage probability is above the predetermined value, the new user is rejected.
Abstract:
A wireless communication system has a variable number of time slots or frequencies allocated to support either uplink or downlink communications. Time slots or frequencies available for allocation to support either uplink or downlink communications are determined. Potential switching points between the available time slots or frequencies are determined. The switching points represent a change between time slots or frequencies used to support uplink and downlink communications. For each switching point, for each of uplink and downlink, a number of user that can be supported is determined by comparing a blocking probability of real time services with a required blocking probability of real time services and an average delay of non-real time services with a required average delay of non-real time services is compared. A minimum of the uplink and downlink users is selected that can be supported as the number of users that can be supported for that switching point. The switching point having a maximum number of users that can be supported is selected. The available uplink and downlink time slots or frequencies are allocated based on the selected switch point.
Abstract:
A method and strategy for transport format combination (TFC) selection and related algorithms in wireless communications. The method provides procedures used by the MAC layer in both the UE and the RNC to schedule data transmission. In the inventive method, each time the maximum transmit power is reached in a time slot, the physical layer will send a notification to the MAC layer, including the time slot number where maximum power was reached. The invention provides a low cost method and algorithm avoiding the need for the MAC to determine the power needed by each TFC in each time slot.