摘要:
Data is transmitted via time division multiple access methods and every radio cell includes one base station each for the radio coverage of a plurality of mobile stations assigned to the radio cell. The base station receives, in addition to mobile station signals of its own radio cell, mobile station signals of neighboring radio cells and determines, on the basis of the mobile station signals received, a time synchronization value and/or a frequency synchronization value to which the base station synchronizes itself.
摘要:
In a method for wireless communication, a receiver receives a first signal at a first radio frequency and determines the reception level of the first signal. The receiver receives data during a reception level of the first signal at the first radio frequency. The receiver decides, based on the determined reception level, whether at least one measurement is to be taken on a second signal transmitted at a second radio frequency. A radio station carries out the method.
摘要:
Irregular LDPC codes have a construction which allows one to obtain a number of codes with different length from a single prototype code with a parity check matrix given by H=[Hz Hi], where Hz specifies the well-known zigzag pattern in the corresponding Tanner graph. The parity check matrices for longer codes are obtained as [Hz′ Π diag(Hi, . . . , Hi)], where Hz′ specifies a longer zigzag pattern depending on the number of matrices Hi used, and Π represents some permutation. This allows one to construct the decoder for a longer code by reusing hardware components developed for decoding the prototype code.
摘要:
A possibility for transmitting data via a radiolink with a timeslot structure in a radiocommunications system is described, measurement data for determining the transmission characteristics of the radiolink being inserted within the timeslot structure in dependence on the variation with time of the transmission characteristics of the radiolink between the base station and the terminal at the subscriber end in the timeslot structure.
摘要:
In a case where the radio coverage of first and the second radio communication systems, each including a plurality of radio stations, overlaps at least partially, a message containing operating instructions for organization of communication within the second radio communication system is sent from the first radio communication system to at least some of the radio stations of the second radio communication system.
摘要:
A method determines a path in a radio communications system comprising a multitude of at least partially mobile radio stations of which one radio station that is located in a radio coverage area of another radio station constitutes a radio station that is adjacent to the other radio station. In the radio communications system, items of information can be transmitted by a first radio station, which serves as a transmitting radio station, to a second radio station, which serves as a receiving radio station, over at least one path directly or via one or more other radio stations that receive and relay the items of information. A path between the first and the second radio station consists of a succession of radio stations that, in addition to the first radio station and the second radio station, optionally include the radio stations, which are located in the succession between the first and second radio stations and which receive and relay the items of information. In order to determine at least one path between the first and the second radio station, both the first as well as the second radio station each send a message containing identification information from the respective other radio station to their respective adjacent radio station(s).
摘要:
Radio communication resources are allocated in a cellular radio communication system having a plurality of user stations and network units by subdividing a frequency band that is sub-divided into a plurality of sub-carriers used for communication purposes. In several radio cells, one or more network units sub-divides(s) the frequency band into a number of sub-bands having one or more respective sub-carriers, sub-divide(s) the user stations into a number of groups and allocate(s) a sub-band for communication purposes to each group. The number of sub-bands differs for at least two radio cells.
摘要:
The invention relates to a method for transmitting signals in a radio communication system consisting of at least two frequency signal-transmitting channels. At least the first (fcoord) of said frequency channels is used for organising radio resources, and at least the second (fi) of the frequency channels is used for transmitting signals between the stations of the system where the signal transmission is carried out by the frequency channels from/in a direction of said stations in conformity with a predefined temporal pattern (P1, P2, P3).
摘要:
Radio communication resources are allocated in an at least partially self-organising radio communications system having several user stations and at least one central entity for organizing the allocation of radio communication resources, in addition to a corresponding radio communications system. Resources for direct communication between at least two respective user stations are allocated repeatedly at least partly by the central entity.
摘要:
OFDM symbols are generated using data from one or more users or from one or more data sources represented on a number of sub-carriers. To inhibit multiple-access interference on application of the CDMA principle, the data are transformed in a data-source specific manner and only subsequently allocated to the sub-carriers, independently of the transformation.