English to Polish Tech/Engineering Telecom(munications) Metody dostępu do systemu komunikacji bezprzewodowej

Wszystkie elementy znane, ale jak to połączyć

1) bandwidth - żądanie przydzielenia szerokości pasma
2) ranging - określanie odległości / zasięgu
3) performance - wiadomo

Kontekst:

The random access or ranging process includes an initial/handover ranging function for synchronizing an SS [stacja abonencka] with a BS [stacja bazowa] during the initial network entry or reentry and during cell handoff, a periodic ranging function for maintaining SS synchronization, and a bandwidth request function that allows each SS to request uplink bandwidth allocation. These uplink ranging functions fulfill very important tasks that can significantly influence the user experience. For example, the bandwidth request ranging performance directly impacts the access latency perceived by a user, especially during communication sessions (e.g., HTTP) that consist of sporadic packet traffic that requires fast response, in which case high detection and low collision probabilities of the access request are very desirable. In another example, robust detection of an initial ranging signal is essential in order to allow a user to quickly enter the network or to be handed over to a new serving sector. Reliable extraction of the accurate timing offsets from the initial ranging signals is also critical for achieving uplink synchronization that ensures user orthogonality (i.e., to make sure that each SS occupies its own allocated subcarriers without interfering with other SS). Other important information that the BS needs to extract from ranging includes power measurement, frequency synchronization, and channel impulse response estimation, etc. Therefore, there is a need for an efficient and flexible air interface mechanism that enables fast and reliable user access to the network.