Abstract:
The present invention provides methods of managing interference in a wireless communication system. The methods may include receiving information indicative of a portion of an interfering signal (120) received by a first wireless communication device, decoding the portion of the interfering signal (120), and providing at least one back-off instruction destined for a second wireless communication device (115) based on the decoded portion of the interfering signal (120).
Abstract:
The present invention provides a method of route optimization for a proxy mobile Internet protocol. The method may include providing information indicative of a first proxy address based on a first address associated with a first access terminal and receiving information indicative of a second proxy address associated with a second access terminal. The method may also include establishing a communication link between the first access terminal and the second access terminal based on the first and second proxy addresses such that the communication link does not include a home agent.
Abstract:
A method is provided of adjusting transmission power of pilot signals from a picocell base station for radio communications to a user terminal in radio connection with the picocell base station. The method comprises: the base station sending a signal at a first signal power; the user terminal measuring received signal level and sending an information signal indicating received signal level; and the base station adjusting its pilot signal power dependent upon said received signal level indicated in the information signal.
Abstract:
A wireless communication system (20) allows for using base station router devices (30,. 32) for in building communications using a mobile station (22). Automatically registering a base station router device and automatically configuring at least an initial parameter for a frequency, transmit power and definition code of the base station router device facilitates easy installation of such devices. In one example, the initial parameters are determined by a communication server associated with a wireless communication network. In another disclosed example, at least one of the initial parameters is automatically determined by the base station router device.
Abstract:
A communications system (1) includes an underlay network (2), which a cellular communications network implemented using UMTS technology, and an overlay home cell (8) set up by a user using a base station router (7), or other similar access device. A call may be transferred from the home cell (8) to a cell of the underlay network (2) and vice versa. If these operate at different tariffs, the user may find that handover between them results in extra charges for an on-going call. The user terminal (10) is enabled so as to allow the user to determine if handover should be performed, and thus retain control of costs incurred in making a call. The user terminal (10) may give an alert if there is a risk of imminent handover, allowing the user to take avoiding action if desired, or the user may configure preferences to control under what conditions handover may be performed.
Abstract:
A transmit power control technique within a wireless communication system includes adjusting a transmit power used by a picocell base station unit based upon a position of the picocell within a macrocell. When a picocell base station unit is located relatively close to a macrocell base station or center of the macrocell, the transmit power of the picocell base station unit is increased to avoid downlink interference from the macrocell base station for mobile stations communicating within the picocell. When a picocell base station unit is located relatively close to an edge of a macrocell, the transmit power of the picocell base station is decreased to avoid interference caused by the picocell base station unit for mobile stations communicating within the macrocell in the vicinity of the picocell. In a disclosed example determined downlink interference levels provide an indication of the position of the picocell within the macrocell and provide an indication of how to automatically adjust the transmit power of the picocell base station unit.
Abstract:
Disclosed is a system and method for transmitting a data packet from a source to a destination via a network path having a number of hops. The sum of a playback delay associated with the data packet and the number of hops are stored in a header of the data packet. The data packet is transmitted from the source to the destination via the network path.
Abstract:
A method is provided of a base station for wireless telecommunications changing scrambling code to be applied to pilot signals for transmission. The method comprises automatically: identifying a need to change scrambling code, selecting a new scrambling code for use, reprogramming the base station to use the scrambling code, and using the new scrambling code for subsequent pilot signal transmissions.
Abstract:
The present invention provides a method involving a tamper-resistant module and an authentication server. The method includes receiving, at the tamper-resistant module, information encrypted using a first secret key stored in the authentication server. The method also includes authenticating the authentication server in response to decrypting the information using a second secret key stored in the tamper-resistant module.