摘要:
In a telecommunications system that employs frequency hopping techniques, network performance can be significantly improved by taking into consideration the level of interaction (e.g., the collision rate) between frequency hopping sequences, when allocating the frequency hopping sequences throughout the network. In a cellular network, this may be accomplished by deriving a network performance measure as a function of a current allocation of frequency hopping sequences for a number of cells and as a function of an expected collision rate (between the frequency hopping sequences) that appear for the current allocation. The frequency hopping sequences are then re-allocated amongst one or more cells until network performance is optimized. The allocation of frequency hopping sequences that results in optimized network performance may then be used for assigning frequency hopping sequences to new or existing connections (e.g., cellular calls) within a corresponding cell.
摘要:
A frequency hopping sequence generator system (40) for use in a radio telecommunications system utilizes variable frequency offsets (FO) to determine a frequency hopping sequence for use in communication between a mobile station and a network node. The frequency hopping sequence generator comprises a frequency offset hopping generator (42) which chooses the variable frequency offsets so that the frequency hopping sequence provides intra-cell interference diversity. For each mobile station, the frequency offset hopping generator determines a frequency offset index (FOI) which is mapped to one of plural possible frequency offsets (FO). The frequency offset index (and thus the corresponding frequency offset) is determined to provide the frequency hopping sequence with both interference diversity and orthogonality. The frequency offset index has a first component and a second component. The first component of the frequency offset index is an inter-cell component that provides, e.g., collision diversity between FO hopping sequences that are not orthogonal. The second component is an intra-cell component that provides orthogonal (non-colliding) sequences with a variable difference between two sequences. The intra-cell component sub-generator can operate in either a “short sequences” mode or a “long sequences” mode. The long sequences mode renders adjacent frequency collision rates between two sequences with equal FOHSN independent of the choice of the two different FOSEEDs selected. On the other hand, the short sequences mode yields higher collision rates between certain pairs than between other pairs.
摘要:
A frequency hopping sequence generator system (40) for use in a radio telecommunications system utilizes variable frequency offsets (FO) to determine a frequency hopping sequence for use in communication between a mobile station and a network node. The frequency hopping sequence generator comprises a frequency offset hopping generator (42) which chooses the variable frequency offsets so that the frequency hopping sequence provides intra-cell interference diversity. For each mobile station, the frequency offset hopping generator determines a frequency offset index (FOI) which is mapped to one of plural possible frequency offsets (FO). The frequency offset index (and thus the corresponding frequency offset) is determined to provide the frequency hopping sequence with both interference diversity and orthogonality. The frequency offset index has an inter-cell component (that provides, e.g., collision diversity between FO hopping sequences that are not orthogonal) and an intra-cell component (that provides orthogonal (non-colliding) sequences with a variable difference between two sequences).
摘要:
Method and arrangement in a base station for providing an input parameter in an algorithm for predicting uplink load in a cell in a wireless communication system. The cell comprises at least one user equipment. The method comprises obtaining SIR target value associated with the user equipment, measuring SIR value on a signal sent from the user equipment, comparing the difference between the obtained SIR target value and the measured SIR value with a threshold limit value, selecting the SIR value as input parameter in the uplink load prediction algorithm for the user equipment, if the difference between the obtained SIR target value and the measured SIR value is bigger than the threshold limit value. Otherwise selecting the SIR target value as input parameter in the uplink load prediction algorithm for the user equipment.
摘要:
In a telecommunication system, a method for improved handover signaling includes temporarily enhancing the radio environment of a user engaged in handover signaling by muting one or more dominant interfering cells during the signaling process, and coordinating the muting with the actual handover signaling.
摘要:
A method and apparatus for determining the content in bursts to be transmitted from a base station in a mobile network on a broadcast frequency in specific timeslots of a broadcast frequency frame structure. A current state of the logical channel allocated to the forthcoming burst is checked, and the content in the forthcoming burst is determined depending on the current channel state. A dummy burst with a base station specific training sequence is transmitted if there is no data to transmit, and if the dummy burst cannot be confused with a regular traffic burst according to the current channel state. The dummy burst contains no intelligible information to mobile terminals.
摘要:
In a radio communication system that includes multiple service areas, each service area is associated with a predetermined number or amount of radio communication resources. Each radio communication resource can be used for a prescribed period of time corresponding to one or more time units. An operator or other entity identifies a set of service areas to be tested at an increased effective load. A desired test level (e.g., increased traffic load) is determined, and a corresponding number of radio resource time units is determined to achieve the desired test level conditions. Use of radio communication resources in the determined one or more time units is blocked for a test period. Performance by each service area during the test period is determined.
摘要:
The present invention relates to a method and an arrangement in a first communication node for adjusting a channel quality report transmitted between the first communication node and a second communication node. The first communication node and the second communication node are comprised in a wireless communication network, and are adapted to communicate with each other via a radio link. In a first step, a channel quality report is received from the second communication node. The channel quality report is established by the second communication node. Then at least one channel characteristic parameter is obtained. The next step is to determine a channel quality offset based on the obtained channel characteristic parameter. Based on the channel quality offset, the channel quality report is adjusted.
摘要:
The present invention provides a method for inducing gamete maturation in marine worms of the family arenicolidae and which exhibit epidemic spawning. In the method, male and/or female worms in a housing substrate (such as sand) in sea water are maintained at a temperature of 4 to 8° C. for 14 to 24 days, preferably 5 to 7° C. for 20 to 22 days. Spawning of the worms can them be induced either by exposure to suitable spawning promoting hormones or by raising the temperature of the sea water to 12 to 14° C.
摘要:
The present invention provides a method for the aquaculture of marine deposit feeders, such as Arenicola marina and Arenicola defodiens. The method comprises providing a foodstuff such as brewery yeast or waste from fish farms within the substrate housing the worms. The foodstuff is conveniently particulate or microparticulate to aid intimate admixture with a substrate, which is typically sand.