Abstract:
In a cellular radio-telephone system (50), a method of selecting an appropriate handoff target where the timing advance of a mobile has exceeded a timing advance threshold, the bit error rate has risen above a BER threshold, or the signal level has fallen below an RSSI threshold. The method includes discarding signal measurements of inappropriate base sites or base sites at excessive distance and performing calculations on the remaining measurements to select an appropriate handoff target.
Abstract:
A method of selecting handover targets for a communication unit (40) exchanging a communicated signal through a serving base site (10-19) in a digital cellular system. The method uses timing advance to determine a relative distance of a communication unit (40) to the serving base site (10-19). The method comprises the steps of comparing a timing advance value with a first threshold. The first threshold may be equal to a distance one and one-half times the radius of the serving cell. When the timing advance value exceeds the first threshold, a base site frequency list is modified to include base sites non-adjacent the serving base site. The identity of the base sites non-adjacent the serving base sites may be determined from the directionality of communication unit (40). The method further includes the step of selecting a handover target providing highest relative RRSI value to the communication unit (40) from the modified base site frequency list.
Abstract:
The disparate data and commands from are received from a managed resource (102) and have potentially different semantics. The disparate data and commands are processed according to rules received from an autonomic manager (112) to produce a single normalized view of this information. The actual state of the managed resource is determined from the normalized view of disparate data. The actual state of the managed resource (102) is compared to a desired state of the managed resource (102). When a match does not exist between the actual state and the desired state, a configuration adjustment to the managed resource (102) and/or another resource is determined to allow the actual state to be the same as the desired state. Then, the configuration adjustment is applied to the managed resource (102). When a match exists between the actual state and the desired state, maintenance functions associated with the managed resource (102) are performed.
Abstract:
An AMPS system facilitates reception and processing of a DS CDMA signal transmitted by a mobile station (125). The AMPS system provides an alternate path for the signal to be received by a DS CDMA receiver (506) system. The DS CDMA receiver system generates a signal compatible with the AMPS system, adjusts the generated signal to be proportional to the DS CDMA signal, and inputs the adjusted signal (510) into the AMPS system. The AMPS system then processes the adjusted signal for purposes of handoff of the mobile station (125) from the DS CDMA system to the AMPS system.
Abstract:
A base-site (109) communicating to a mobile (108) increases the power level of a transmission of a handoff command when required. The base-site (109) detects when handoff is required, and transmits the handoff command at a first power level (P1) which is essentially equal to the power level of the base-site (109) to mobile (108) voice communication power level. If the handoff command does not reach mobile (108), either after the elapse of a predetermined time period or some other predetermined triggering event, base-site (109) transmits the handoff command at a second, increased power level (P2).
Abstract:
Handoff from a Code-Division, Multiple Access (CDMA) protocol to an Advanced Mobile Phone Service (AMPS) protocol occurs by comparing a remote unit's (405) phase shift measurement to a threshold (503) and determining a reference CDMA base station (401) from an active set of CDMA base stations (515). Next, corrected phase shifts are calculated for each CDMA base station in the active set (521) and the remote unit (405) is handed off to an AMPS base station (109) underlying the CDMA coverage area (126) having the smallest corrected phase shift (525).
Abstract:
A method is offered of achieving a desired C/I ratio within a cellular system, at reduced transmitter power levels, by measuring a signal loss on a downlink between a base site transmitter (31) and mobile receiver (20) and calculating an uplink signal magnitude at a base site receiver. A communication channel is then selected from a number of communication channels based upon comparison of the uplink signal magnitude with pre-measured interference levels for each channel of the number of channels to produce a desired C/I ratio.
Abstract:
Un procédé permet de sélectionner des objectifs de commutation pour un poste de communication (40) qui échange un signal communiqué grâce à un serveur de base (10-19) de système cellulaire numérique. Ce procédé recourt à l'anticipation afin de déterminer la distance relative séparant le poste de communication (40) et le site du serveur de base (10-19). Il convient de comparer une valeur d'anticipation avec un premier seuil qui peut égaler une distance valant 1,5 fois le rayon de la cellule desservie. Quand la valeur d'anticipation dépasse le premier seuil, ceci entraîne la modification d'une liste relative aux fréquences des sites de base à laquelle viennent s'ajouter des sites de base non adjacents au site de base serveur. On peut déterminer l'identité de ces sites non adjacents grâce à la directivité du poste de communication (40). Ce procédé porte aussi sur la sélection d'un objectif de commutation qui fournit la valeur relative d'intensité de signal reçu la plus élevée au poste de communication (40), grâce à la liste modifiée des fréquences de sites de base.
Abstract:
Handoff from a Code-Division, Multiple Access (CDMA) protocol to an Advanced Mobile Phone Service (AMPS) protocol occurs by comparing a remote unit's (405) phase shift measurement to a threshold (503) and determining a reference CDMA base station (401) from an active set of CDMA base stations (515). Next, corrected phase shifts are calculated for each CDMA base station in the active set (521) and the remote unit (405) is handed off to an AMPS base station (109) underlying the CDMA coverage area (126) having the smallest corrected phase shift (525).